million in the second quarter of 2022 due to the increase in cash and cash equivalents attributable to the aforementioned hedge monetization transaction and strong cash flows throughout the quarter driven by high oil and gas prices. Β Β
As of June 30, 2022, Net Debt to TTM Adjusted EBITDA was 0.7 times. Β Assuming recent strip pricing for the remainder of 2022, no additional acquisitions for the remainder of the year, and no equity issuances by the Company, including under the Companyβs existing At-The-Market Equity Distribution program, W&T estimates that Net Debt to TTM Adjusted EBITDA will decline to approximately 0.5 times.
The Company continues to monitor the debt capital markets to refinance all or a portion of the Senior Second Lien Notes. Β
Regarding the approaching maturity of the Companyβs 9.75% Senior Second Lien Notes (due November 2023), Mr. Krohn commented, βOur preference is to refinance the outstanding Second Lien Notes with financing providing longer tenors and market-based covenants at an attractive interest rate. Β However, should the debt market continue to be difficult to access due to market volatility, we believe there is a path for the Company to pay off those notes at maturity. Β Strong anticipated future cash flows, combined with our significant cash position, availability under our undrawn credit facility, and, if needed, access to our unused at-the-market equity program, give us confidence that we will be able to address those notes in the event that we are not able to access the debt markets at a reasonable cost.β
Capital Expenditures and Acquisitions: Β Capital expenditures (excluding changes in working capital associated with investing activities) in the second quarter of 2022 were $8.1 million. Β Additionally, the Company spent $17.5 million to acquire the remaining 20% working interests in the Ship Shoal 230, South Marsh Island/Vermilion 191, and South Marsh Island 73 fields. Β
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MID-YEAR 2022 PROVED RESERVES
As calculated by NSAI, W&Tβs independent reserve engineering consultants, proved reserves using SEC pricing methodology totaled 168.3 MMBoe, compared with 157.6 MMBoe at year-end 2021. Β The increase in proved reserves is the result of positive performance revisions of 6.3 MMBoe, positive price revisions of 6.3 MMBoe, and the purchase of minerals in place of 5.3 MMBoe, partially offset by 7.3 MMBoe of production in the first half of 2022. Β The mid-year proved reserves, which were 88% proved developed and proved developed non-producing, were 35% liquids. Β Utilizing NYMEX strip pricing as of July 19, 2022, mid-year proved reserves were 164.1 MMBoe.
The pre-tax PV-10 of the mid-year 2022 proved reserves using SEC pricing was $2.6 billion (before consideration of expenditures for asset retirement obligations), an increase of 62% compared with the PV-10 of $1.6 billion at year-end 2021 using SEC pricing. Β Using NYMEX strip pricing as of July 19, 2022, the PV-10 the mid-year reserves was $2.3 billion.
Mid-year 2022 SEC proved reserves and PV-10 were based on an average 12-month crude oil and natural gas prices of $85.82 per barrel and $5.13 per Mcf, respectively. Β Prices used to determine proved reserves and PV-10 for year-end 2021 were $66.55 per barrel of oil and $3.60 per Mcf of natural gas.
2022 CAPITAL INVESTMENT PROGRAM
W&Tβs range for capital expenditures in 2022 remains unchanged at $70 million to $90 million for the full year, which excludes acquisition opportunities. Β Included in this range are planned expenditures related to one deepwater well and three shelf wells, as well as capital costs for facilities, leasehold, seismic, and recompletions. Β The Company has significant flexibility to adjust its spending since it has no long-term rig commitments or near-term drilling obligations.
Similarly, the range for plugging and abandonment expenditures remains unchanged in the range of $55 million to $75 million, driven by obligations and prior Covid-19-related deferrals on terminated leases with U.S. Bureau of Safety and Environmental Enforcement (βBSEEβ) deadlines before year-end 2022. Β The Company spent $34.3 million on ARO settlements in the second quarter of 2022.
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