1 of 5 FORM 10-Q SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 (Mark One) (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2005 OR ( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ________________ to ________________ Commission file number 0-18996 SOUTHWEST OIL & GAS 1990-91 INCOME PROGRAM Southwest Oil & Gas Income Fund X-A, L.P. (Exact name of registrant as specified in its limited partnership agreement) Delaware 75-2310854 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 6 Desta Drive, Suite 6500 Midland, Texas 79705 (Address of principal executive offices) (432) 682-6324 (Registrant's telephone number, including area code) Indicate by check mark whether registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days: Yes X No ___ Indicate by check mark whether the registrant is an accelerated filer (as defined in Exchange Act Rule 12b-2). Yes No X The registrant's outstanding securities consist of Units of limited partnership interests for which there exists no established public market from which to base a calculation of aggregate market value. The total number of pages contained in this report is 20 Glossary of Oil and Gas Terms The following are abbreviations and definitions of terms commonly used in the oil and gas industry that are used in this filing. All volumes of natural gas referred to herein are stated at the legal pressure base to the state or area where the reserves exit and at 60 degrees Fahrenheit and in most instances are rounded to the nearest major multiple. Bbl. One stock tank barrel, or 42 United States gallons liquid volume. BOE. Equivalent barrels of oil, with natural gas converted to oil equivalents based on a ratio of six Mcf of natural gas to one Bbl of oil. Developmental well. A well drilled within the proved area of an oil or natural gas reservoir to the depth of a stratigraphic horizon known to be productive. Exploratory well. A well drilled to find and produce oil or gas in an unproved area to find a new reservoir in a field previously found to be productive of oil or natural gas in another reservoir or to extend a known reservoir. Farm-out arrangement. An agreement whereby the owner of a leasehold or working interest agrees to assign his interest in certain specific acreage to an assignee, retaining some interest, such as an overriding royalty interest, subject to the drilling of one (1) or more wells or other specified performance by the assignee. Field. An area consisting of a single reservoir or multiple reservoirs all grouped on or related to the same individual geological structural feature and/or stratigraphic condition. Mcf. One thousand cubic feet. Net Profits Interest. An agreement whereby the owner receives a specified percentage of the defined net profits from a producing property in exchange for consideration paid. The net profits interest owner will not otherwise participate in additional costs and expenses of the property. Oil. Crude oil, condensate and natural gas liquids. Overriding royalty interest. Interests that are carved out of a working interest, and their duration is limited by the term of the lease under which they are created. Present value and PV-10 Value. When used with respect to oil and natural gas reserves, the estimated future net revenue to be generated from the production of proved reserves, determined in all material respects in accordance with the rules and regulations of the SEC (generally using prices and costs in effect as of the date indicated) without giving effect to non-property related expenses such as general and administrative expenses, debt service and future income tax expenses or to depreciation, depletion and amortization, discounted using an annual discount rate of 10%. Production costs. Costs incurred to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. Proved Area. The part of a property to which proved reserves have been specifically attributed. Proved developed oil and gas reserves. Proved oil and gas reserves that can be expected to be recovered from existing wells with existing equipment and operating methods. Proved properties. Properties with proved reserves. Proved oil and gas reserves. The estimated quantities of crude oil, natural gas, and natural gas liquids with geological and engineering data that demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions, i.e., prices and costs as of the date the estimate is made. Proved undeveloped reserves. Proved oil and gas reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion. Reservoir. A porous and permeable underground formation containing a natural accumulation of producible oil or gas that is confined by impermeable rock or water barriers and is individual and separate from other reservoirs. Royalty interest. An interest in an oil and natural gas property entitling the owner to a share of oil or natural gas production free of costs of production. Working interest. The operating interest that gives the owner the right to drill, produce and conduct operating activities on the property and a share of production. Workover. Operations on a producing well to restore or increase production. PART I. - FINANCIAL INFORMATION Item 1. Financial Statements The unaudited condensed financial statements included herein have been prepared by the Registrant (herein also referred to as the "Partnership") in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments necessary for a fair presentation have been included and are of a normal recurring nature. The financial statements should be read in conjunction with the audited financial statements and the notes thereto for the year ended December 31, 2004, which are found in the Registrant's Form 10-K Report for 2004 filed with the Securities and Exchange Commission. The December 31, 2004 balance sheet included herein has been taken from the Registrant's 2004 Form 10-K Report. Operating results for the three month period ended March 31, 2005 are not necessarily indicative of the results that may be expected for the full year. Southwest Oil & Gas Income Fund X-A, L.P. Balance Sheets March December 31, 31, 2005 2004 ----- ----- (unaudit ed) Assets - -------- Current assets: Cash and cash equivalents $ 27,006 27,554 Receivable from Managing 46,380 45,235 General Partner -------- -------- ---- ---- Total current assets 73,386 72,789 -------- -------- ---- ---- Oil and gas properties - using the full- cost method of accounting 3,871,01 3,871,05 0 1 Less accumulated depreciation, depletion and amortization 3,638,66 3,636,97 0 1 -------- -------- ---- ---- Net oil and gas properties 232,350 234,080 -------- -------- ---- ---- $ 305,736 306,869 ======= ======= Liabilities and Partners' Equity - ---------------------------- - ------------ Current liabilities: Distributions payable $ 689 554 -------- -------- ---- ---- Asset retirement obligation 146,575 144,360 -------- -------- ---- ---- Partners' equity (deficit): General partners (12,421) (12,242) Limited partners 170,893 174,197 -------- -------- ---- ---- Total partners' equity 158,472 161,955 -------- -------- ---- ---- $ 305,736 306,869 ======= ======= The accompanying notes are an integral part of these financial statements. Southwest Oil & Gas Income Fund X-A, L.P. Statements of Operations (unaudited) Three Months Ended March 31, 2005 2004 ----- ----- Revenues - ------------- Oil and gas $ 123,847 94,043 Other - 250 -------- -------- -- -- 123,847 94,293 -------- -------- -- -- Expenses - ------------ Production 59,498 45,712 Depreciation, depletion and 1,689 2,000 amortization Accretion of asset retirement 2,541 2,760 obligation General and administrative 23,602 23,355 -------- -------- -- -- 87,330 73,827 -------- -------- -- -- Net income $ 36,517 20,466 ====== ====== Net income allocated to: Managing General Partner $ 3,439 2,022 ====== ====== General partner $ 382 225 ====== ====== Limited partners $ 32,696 18,219 ====== ====== Per limited partner unit $ 3.12 1.74 ====== ====== The accompanying notes are an integral part of these financial statements. Southwest Oil & Gas Income Fund X-A, L.P. Statements of Cash Flows (unaudited) Three Months Ended March 31, 2005 2004 ----- ----- Cash flows from operating activities: Cash received from sales of oil $ 122,702 92,508 and gas Cash paid to suppliers (83,426) (69,067) Other - 250 -------- -------- -- -- Net cash provided by operating 39,276 23,691 activities -------- -------- -- -- Cash flows provided by investing activities: Proceeds from sale of equipment 41 1,910 -------- -------- -- -- Cash flows used in financing activities: Distributions to partners (40,000) - Increase in distribution payable 135 - -------- -------- -- -- Net cash used in financing (39,865) - activities -------- -------- -- -- Net (decrease) increase in cash (548) 25,601 and cash equivalents Beginning of period 27,554 4,004 -------- -------- -- -- End of period $ 27,006 29,605 ====== ====== Reconciliation of net income to net cash provided by operating activities: Net income $ 36,517 20,466 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, depletion and 1,689 2,000 amortization Accretion of asset retirement 2,541 2,760 obligation Adjust asset retirement for plug (326) - and abandonment wells Increase in receivables (1,145) (1,535) Decrease in payables - - -------- -------- -- -- Net cash provided by operating $ 39,276 23,691 activities ====== ====== The accompanying notes are an integral part of these financial statements. Southwest Oil & Gas Income Fund X-A, L.P. (a Delaware limited partnership) Notes to Financial Statements 1. Organization Southwest Oil and Gas Income Fund X-A, L.P. was organized under the laws of the state of Delaware on January 29, 1990, for the purpose of acquiring producing oil and gas properties and to produce and market crude oil and natural gas produced from such properties for a term of 50 years, unless terminated at an earlier date as provided for in the Partnership Agreement. The Partnership sells its oil and gas production to a variety of purchasers with the prices it receives being dependent upon the oil and gas economy. Southwest Royalties, Inc., a wholly owned subsidiary of Clayton Williams Energy, Inc., serves as the Managing General Partner. Revenues, costs, and expenses are allocated as follows: Limited General Partners Partners -------- -------- -- --- Interest income on capital 100% - contributions Oil and gas sales 90% 10% All other revenues 90% 10% Organization and offering 100% - costs (1) Syndication costs 100% - Amortization of organization 100% - costs Property acquisition costs 100% - Gain/loss on property 90% 10% disposition Operating and administrative 90% 10% costs (2) Depreciation, depletion and amortization of oil and as properties 100% - All other costs 90% 10% (1) All organization costs in excess of 3% of initial capital contributions will be paid by the Managing General Partner and will be treated as a capital contribution. The Partnership paid the Managing General Partner an amount equal to 3% of initial capital contributions for such organization costs. (2) Administrative costs in any year which exceed 2% of capital contributions shall be paid by the Managing General Partner and will be treated as a capital contribution. 2. Summary of Significant Accounting Policies The interim financial information as of March 31, 2005, and for the three months ended March 31, 2005, is unaudited. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted in this Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission. However, in the opinion of management, these interim financial statements include all the necessary adjustments to fairly present the results of the interim periods and all such adjustments are of a normal recurring nature. The interim consolidated financial statements should be read in conjunction with the Partnership's Annual Report on Form 10-K for the year ended December 31, 2004. In September 2004, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 106 ("SAB 106"). SAB 106 expresses the SEC staff's views regarding SFAS No. 143 and its impact on both the full- cost ceiling test and the calculation of depletion expense. In accordance with SAB 106, beginning in the first quarter of 2005, undiscounted abandonment costs for wells to be drilled in the future to develop proved reserves are included in the unamortized cost of oil and gas properties, net of related salvage value, for purposes of computing depreciation, depletion and amortization ("DD&A"). The implementation of SAB 106 did not have a material impact on our financial statements. Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations General Southwest Oil & Gas Income Fund X-A, L.P. was organized as a Delaware limited partnership on January 29, 1990. The offering of such limited partnership interests began on May 11, 1990 as part of a shelf offering registered under the name Southwest Oil & Gas 1990-91 Income Program. Minimum capital requirements for the Partnership were met on August 15, 1990, with the offering of limited partnership interests concluding on November 30, 1990, with total limited partner contributions of $5,242,000. The Partnership was formed to acquire interests in producing oil and gas properties, to produce and market crude oil and natural gas produced from such properties, and to distribute the net proceeds from operations to the limited and general partners. Net revenues from producing oil and gas properties will not be reinvested in other revenue producing assets except to the extent that production facilities and wells are improved or reworked or where methods are employed to improve or enable more efficient recovery of oil and gas reserves. The economic life of the Partnership thus depends on the period over which the Partnership's oil and gas reserves are economically recoverable. Increases or decreases in Partnership revenues and, therefore, distributions to partners will depend primarily on changes in the prices received for production, changes in volumes of production sold, lease operating expenses, enhanced recovery projects, offset drilling activities pursuant to farm-out arrangements, sales of properties, and the depletion of wells. Since wells deplete over time, production can generally be expected to decline from year to year. Well operating costs and general and administrative costs usually decrease with production declines; however, these costs may not decrease proportionately. Net income available for distribution to the partners is therefore expected to decline in later years based on these factors. Oil and Gas Properties Oil and gas properties are accounted for at cost under the full-cost method. Under this method, all productive and nonproductive costs incurred in connection with the acquisition, exploration and development of oil and gas reserves are capitalized. Gain or loss on the sale of oil and gas properties is not recognized unless significant oil and gas reserves are sold. Should the net capitalized costs exceed the estimated present value of oil and gas reserves, discounted at 10%, such excess costs would be charged to current expense. As of March 31, 2005 the net capitalized costs did not exceed the estimated present value of oil and gas reserves. Critical Accounting Policies The Partnership follows the full cost method of accounting for its oil and gas properties. The full cost method subjects companies to quarterly calculations of a "ceiling", or limitation on the amount of properties that can be capitalized on the balance sheet. If the Partnership's capitalized costs are in excess of the calculated ceiling, the excess must be written off as an expense. The Partnership's discounted present value of its proved oil and natural gas reserves is a major component of the ceiling calculation, and represents the component that requires the most subjective judgments. Estimates of reserves are forecasts based on engineering data, projected future rates of production and the timing of future expenditures. The process of estimating oil and natural gas reserves requires substantial judgment, resulting in imprecise determinations, particularly for new discoveries. Different reserve engineers may make different estimates of reserve quantities based on the same data. The Partnership's reserve estimates are prepared by outside consultants. The passage of time provides more qualitative information regarding estimates of reserves, and revisions are made to prior estimates to reflect updated information. However, there can be no assurance that more significant revisions will not be necessary in the future. If future significant revisions are necessary that reduce previously estimated reserve quantities, it could result in a full cost property writedown. In addition to the impact of these estimates of proved reserves on calculation of the ceiling, estimates of proved reserves are also a significant component of the calculation of depletion, depreciation, and amortization ("DD&A"). While the quantities of proved reserves require substantial judgment, the associated prices of oil and natural gas reserves that are included in the discounted present value of the reserves do not require judgment. The ceiling calculation dictates that prices and costs in effect as of the last day of the period are generally held constant indefinitely. Because the ceiling calculation dictates that prices in effect as of the last day of the applicable quarter are held constant indefinitely, the resulting value is not indicative of the true fair value of the reserves. Oil and natural gas prices have historically been cyclical and, on any particular day at the end of a quarter, can be either substantially higher or lower than the Partnership's long-term price forecast that is a barometer for true fair value. Results of Operations General Comparison of the Quarters Ended March 31, 2005 and 2004 The following table provides certain information regarding performance factors for the quarters ended March 31, 2005 and 2004: Three Months Ended Percenta ge March 31, Increase 2005 2004 (Decreas e) ----- ----- -------- -- Oil production in 2,184 2,450 (11%) barrels Gas production in mcf 3,261 2,910 12% Total BOE 2,728 2,935 (7%) Average price per $ 47.62 52% barrel of oil 31.24 Average price per mcf $ 6.08 1% of gas 6.01 Oil and gas revenue $ 123,847 94,043 32% Production expense $ 59,498 45,712 30% Partnership $ 40,000 - 100% distributions Limited partner $ 36,000 - 100% distributions Per unit distribution $ 3.43 - 100% to limited partners Number of limited 10,484 10,484 partner units Revenues The Partnership's oil and gas revenues increased to $123,847 from $94,043 for the quarters ended March 31, 2005 and 2004, respectively, an increase of 32%. The principal factors affecting the comparison of the quarters ended March 31, 2005 and 2004 are as follows: The average price for a barrel of oil received by the Partnership increased during the quarter ended March 31, 2005 as compared to the quarter ended March 31, 2004 by 52%, or $16.38 per barrel, resulting in an increase of approximately $35,800 in revenues. Oil sales represented 84% of total oil and gas sales during the quarter ended March 31, 2005 as compared to 81% during the quarter ended March 31, 2004. The average price for an mcf of gas received by the Partnership increased during the same period by 1%, or $.07 per mcf, resulting in an increase of approximately $200 in revenues. The total increase in revenues due to the change in prices received from oil and gas production is approximately $36,000. The market price for oil and gas has been extremely volatile over the past decade and management expects a certain amount of volatility to continue in the foreseeable future. Oil production decreased approximately 266 barrels or 11% during the quarter ended March 31, 2005 as compared to the quarter ended March 31, 2004, resulting in a decrease of approximately $8,300 in revenues. Gas production increased approximately 351 mcf or 12% during the same period, resulting in an increase of approximately $2,100 in revenues. The net total decrease in revenues due to the change in production is approximately $6,200. The lower oil volumes is due to mechanical problems on an oil well. The increase in gas production is from a reactivated gas well. Costs and Expenses Total costs and expenses increased to $87,330 for the quarter ended March 31, 2005 from $73,827 for the same period in 2004. This represents an increase of 18%. The increase is a result of higher lease operating costs and general administrative expense, partially offset by a decrease in accretion expense and depletion expense. Lease operating costs and production taxes were 30% higher or approximately $13,800 more during the quarter ended March 31, 2005 as compared to the quarter ended March 31, 2004. The increase in lease operating costs is due to well repair work performed on two wells and surface equipment repair on a property. General and administrative costs consist of independent accounting and engineering fees, computer services, postage, and Managing General Partner personnel costs. General and administrative costs increased 1% or approximately $200 during the quarter ended March 31, 2005 as compared to the quarter ended March 31, 2004. Depletion expense decreased to $1,689 for the quarter ended March 31, 2005 from $2,000 for the same period in 2004. This represents a decrease of 16%. The contributing factor to the decrease in depletion expense is in relation to the BOE depletion rate for the quarter ended March 31, 2005, which was $.62 applied to 2,728 BOE as compared to $.68 applied to 2,935 BOE for the same period in 2004. The lower depletion rate in 2005 is due to the upward revision in reserve estimates resulting from higher oil and gas prices. Accretion expense decreased to $2,541 for the quarter ended March 31, 2005 from $2,760 for the same period in 2004. This represents a decrease of 8%. The decrease in accretion is from discontinuing accretion on several wells that reached their projected end of life in 2004. Liquidity and Capital Resources The primary source of cash is from operations, the receipt of income from interests in oil and gas properties. The Partnership knows of no material change, other than the ones noted above, nor does it anticipate any such change. Cash flows provided by operating activities were approximately $39,300 in the quarter ended March 31, 2005 as compared to approximately $23,700 in the quarter ended March 31, 2004. Cash flows provided by investing activities were approximately $40 in the quarter ended March 31, 2005 as compared to approximately $1,900 in the quarter ended March 31, 2004. The principle source of the 2005 cash flow from investing activities was the sale of equipment. Total distributions during the quarter ended March 31, 2005 were $40,000 of which $36,000 ($3.43 per unit) was distributed to the limited partners and $4,000 to the general partner. There were no cash flows used in financing activities in the quarter ended March 31, 2004. The source for the 2005 distributions of $40,000 was oil and gas operations of approximately $39,300 and the change in oil and gas properties of approximately $40, with the balance from available cash on hand at the beginning of the period. There were no distributions during the quarters ended March 31, 2004. Cumulative cash distributions of $2,935,210 have been made to the general and limited partners. As of March 31, 2005, $2,699,286 or $257.47 per limited partner unit has been distributed to the limited partners, representing a 51% return of the capital contributed. As of March 31, 2005, the Partnership had approximately $72,700 in working capital. The Managing General Partner knows of no unusual contractual commitments. Although the partnership held many long-lived properties at inception, because of the restrictions on property development imposed by the partnership agreement, the Partnership cannot develop its non-producing properties, if any. Without continued development, the producing reserves continue to deplete. Accordingly, as the Partnership's properties have matured and depleted, the net cash flows from operations for the partnership has steadily declined, except in periods of substantially increased commodity pricing. Maintenance of properties and administrative expenses for the Partnership are increasing relative to production. As the properties continue to deplete, maintenance of properties and administrative costs as a percentage of production are expected to continue to increase. Recent Accounting Pronouncements In December 2004, the Financial Accounting Standards Board ("FASB") issued Statement of Financial Accounting Standards No. 153 "Exchanges of Nonmonetary Assets, an amendment of APB Opinion No. 29" ("SFAS 153"). SFAS 153 specifies the criteria required to record a nonmonetary asset exchange using carryover basis. SFAS 153 is effective for nonmonetary asset exchanges occurring after July 1, 2005. The Partnership will adopt this statement in the third quarter of 2005, and it is not expected to have a material effect on the financial statements when adopted. In September 2004, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 106 ("SAB 106"). SAB 106 expresses the SEC staff's views regarding SFAS No. 143 and its impact on both the full-cost ceiling test and the calculation of depletion expense. In accordance with SAB 106, beginning in the first quarter of 2005, undiscounted abandonment costs for wells to be drilled in the future to develop proved reserves are included in the unamortized cost of oil and gas properties, net of related salvage value, for purposes of computing depreciation, depletion and amortization ("DD&A"). The implementation of SAB 106 did not have a material impact on our financial statements. Item 3. Quantitative and Qualitative Disclosures About Market Risk The Partnership is not a party to any derivative or embedded derivative instruments. Item 4. Controls and Procedures The Managing General Partner has established disclosure controls and procedures that are adequate to provide reasonable assurance that management will be able to collect, process and disclose both financial and non-financial information, on a timely basis, in the Partnership's reports to the SEC. Disclosure controls and procedures include all processes necessary to ensure that material information is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and is accumulated and communicated to management, including our chief executive and chief financial officers, to allow timely decisions regarding required disclosures. With respect to these disclosure controls and procedures: management has evaluated the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report; this evaluation was conducted under the supervision and with the participation of management, including the chief executive and chief financial officers of the Managing General Partner; and it is the conclusion of chief executive and chief financial officers of the Managing General Partner that these disclosure controls and procedures are effective in ensuring that information that is required to be disclosed by the Partnership in reports filed or submitted with the SEC is recorded, processed, summarized and reported within the time periods specified in the rules and forms established by the SEC. Internal Control Over Financial Reporting There has not been any change in the Partnership's internal control over financial reporting that occurred during the quarter ended March 31, 2005 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting. PART II. - OTHER INFORMATION Item 1. Legal Proceedings None Item 2. Changes in Securities None Item 3. Defaults Upon Senior Securities None Item 4. Submission of Matter to a Vote of Security Holders None Item 5. Other Information None Item 6. Exhibits and Reports on Form 8-K (a) Exhibits: 31.1 Rule 13a-14(a)/15d-14(a) Certification 31.2 Rule 13a-14(a)/15d-14(a) Certification 32.1 Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Southwest Oil & Gas Income Fund X-A, L.P., a Delaware limited partnership By: Southwest Royalties, Inc., Managing General Partner By: /s/ L. Paul Latham L. Paul Latham President and Chief Executive Officer Date: May 16, 2005 SECTION 302 CERTIFICATION Exhibit 31.1 I, L. Paul Latham, certify that: 1. I have reviewed this quarterly report on Form 10-Q of Southwest Oil & Gas Income Fund X-A, L.P., 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have: a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and c)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and 5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions): a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: May 16, 2005 /s/ L. Paul Latham L. Paul Latham President and Chief Executive Officer of Southwest Royalties, Inc., the Managing General Partner of Southwest Oil & Gas Income Fund X-A, L.P. SECTION 302 CERTIFICATION Exhibit 31.2 I, Mel G. Riggs, certify that: 1. I have reviewed this quarterly report on Form 10-Q of Southwest Oil & Gas Income Fund X-A, L.P. 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have: a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and c)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and 5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions): a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: May 16, 2005 /s/ Mel G. Riggs Mel G. Riggs Vice President and Chief Financial Officer of Southwest Royalties, Inc., the Managing General Partner of Southwest Oil & Gas Income Fund X-A, L.P. Exhibit 32.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER Pursuant to 18 U.S.C. 1350 and in connection with the accompanying report on Form 10-Q for the period ended March 31, 2005 that is being filed concurrently with the Securities and Exchange Commission on the date hereof (the "Report"), each of the undersigned officers of Southwest Oil & Gas Income Fund X-A, L.P. (the "Company"), hereby certifies that: 1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company. /s/ L. Paul Latham L. Paul Latham President and Chief Executive Officer of Southwest Royalties, Inc., the Managing General Partner of Southwest Oil & Gas Income Fund X- A, L.P. May 16, 2005 /s/ Mel G. Riggs Mel G. Riggs Vice President and Chief Financial Officer of Southwest Royalties, Inc., the Managing General Partner of Southwest Oil & Gas Income Fund X- A, L.P. May 16, 2005