Exhibit 99.2

Second-Quarter 2009 Results—Supplemental Information
1) | What was the Oilfield Services pretax return on sales for the second quarter of 2009? |
The Oilfield Services pretax return on sales for the second quarter of 2009 was 20.6% versus 23.1% in the first quarter of 2009.
2) | What is the capex guidance for 2009? |
Oilfield Services capex is expected to approach $1.9 billion for the full year 2009.
3) | What was the dollar amount of multiclient surveys capitalized in the second quarter of 2009? |
WesternGeco capitalized $41 million of multiclient surveys in the second quarter of 2009.
4) | What were multiclient sales in the second quarter of 2009? |
Multiclient sales, including transfer fees, were $149 million in the second quarter of 2009.
5) | What is the capex guidance for 2009? |
WesternGeco capex is expected to reach $530 million in 2009, including approximately $225 million for seismic vessels. WesternGeco capex in 2008 was $680 million.
6) | What was the WesternGeco backlog at the end of the second quarter of 2009? |
WesternGeco backlog was $1.2 billion at the end of the second quarter of 2009.
7) | What were the Schlumberger pretax and after-tax returns-on-sales for the second quarter of 2009? |
The Schlumberger pretax return on sales from continuing operations, excluding charges, was 18.2% for the second quarter of 2009—versus 19.9% in the first quarter of 2009.
1/4

The Schlumberger after-tax return on sales from continuing operations, excluding charges, was 14.8% for the second quarter of 2009 and 15.6% in the first quarter of 2009.
8) | What was the Schlumberger stock-based compensation expense for the second quarter of 2009? |
Stock-based compensation expense for the second quarter of 2009 was $45 million, or $0.04 per share.
9) | What was the Schlumberger Net Debt† at the end of the second quarter of 2009? |
Net debt was $990 million at June 30, 2009, compared to $1.53 billion at the end of the previous quarter.
Significant liquidity events during the second quarter included $503 million of capital expenditures, pension plan contributions of $229 million and $186 million for business acquisitions.
| † | Net Debtrepresents gross debt less cash, short-term investments and fixed income investments, held to maturity. |
10) | What was included in “Interest and Other Income” for the second quarter of 2009? |
“Interest and Other Income” for the second quarter of 2009 consisted of the following:
| | | |
| | ($ millions) |
Interest Income | | $ | 17 |
Equity in net earnings of affiliated companies | | | 43 |
| | | |
| | $ | 60 |
11) | How did interest income and interest expense change during the second quarter of 2009? |
Interest income of $17 million decreased $1 million sequentially. Interest expense of $61 million increased $6 million sequentially.
12) | Why was there a difference between the Oilfield Services pretax income and the total pretax income of the four geographic Areas for the second quarter of 2009? |
The difference of $13 million in the second quarter of 2009 arose from Oilfield Services headquarters projects and costs and income items not allocated to the Areas.
2/4

13) | Why was there a difference between the Schlumberger pretax income from continuing operations, before interest and charges, and the pretax income of the two business segments for the second quarter of 2009? |
The difference in the second quarter of 2009 consisted of such items as corporate expenses and interest income and interest expense not allocated to the segments as well as charges, amortization of certain identifiable intangibles, interest on postretirement medical benefits and stock-based compensation expense.
14) | What was the effective tax rate (ETR) for the second quarter of 2009? |
The ETR in the second quarter of 2009 was 18.2%, excluding charges, compared to 21.1% in the prior quarter. Including charges, the second quarter 2009 ETR was 19.8%.
The ETR for the full year 2009 is expected to be in the lower twenties, although some volatility may be experienced in the ETR on a quarterly basis primarily due to the geographic mix of earnings.
D) | Non-GAAP Financial Measures |
In addition to financial results determined in accordance with generally accepted accounting principles (GAAP), this document also includes non-GAAP financial measures (as defined under SEC Regulation G). The following is a reconciliation of these non-GAAP measures to the comparable GAAP measures
| | | | | | | | | | | | | | | | | | |
| | ( Stated in millions, except per share amounts ) |
| |
| | Second Quarter 2009 |
| | Pretax | | | Tax | | | Noncont. Interest | | | Net | | Diluted EPS |
Income from Continuing Operations attributable to Schlumberger | | $ | 767 | | | $ | 152 | | | $ | (2 | ) | | $ | 613 | | $ | 0.51 |
Add back charges: | | | | | | | | | | | | | | | | | | |
- Workforce reduction | | | 102 | | | | 17 | | | | — | | | | 85 | | | 0.07 |
- Postretirement benefits curtailment | | | 136 | | | | 14 | | | | — | | | | 122 | | | 0.10 |
| | | | | | | | | | | | | | | | | | |
Income from Continuing Operations attributable to Schlumberger, before charges | | $ | 1,005 | | | $ | 183 | | | $ | (2 | ) | | $ | 820 | | $ | 0.68 |
| | | | | | | | | | | | | | | | | | |
| | |
| | Second Quarter 2009 | | | |
| | GAAP | | | Before Charges | | |
Pretax return on sales | | | 13.9 | % | | | 18.2 | % | |
After tax return on sales | | | 11.1 | % | | | 14.8 | % | |
Effective tax rate | | | 19.8 | % | | | 18.2 | % | |
There were no charges in the first quarter of 2009 or the first six months of 2008.
3/4

This document, the second-quarter 2009 earnings release and other statements we make contain “forward-looking statements” within the meaning of the federal securities laws, which include any statements that are not historical facts, such as our forecasts or expectations regarding business outlook; growth for Schlumberger as a whole and for each of Oilfield Services and WesternGeco (and for specified products or geographic areas within each segment); oil and natural gas demand and production growth; operating margins; capital expenditures by Schlumberger and the oil and gas industry; the business strategies of Schlumberger customers; the Schlumberger effective tax rate; and future results of operations. These statements are subject to risks and uncertainties, including, but not limited to, the current global economic downturn; changes in exploration and production spending by Schlumberger customers and changes in the level of oil and natural gas exploration and development; general economic and business conditions in key regions of the world; the financial condition of our suppliers and customers in light of current global economic conditions; pricing erosion; operational and project modifications, delays or cancelations; seasonal factors and weather-related events; and other risks and uncertainties detailed in our second-quarter 2009 earnings release, our most recent Form 10-K and other filings that we make with the Securities and Exchange Commission. If one or more of these risks or uncertainties materialize (or the consequences of such a development changes), or should underlying assumptions prove incorrect, actual outcomes may vary materially from those forecasted or expected. Schlumberger disclaims any intention or obligation to update publicly or revise such statements, whether as a result of new information, future events or otherwise.
###
4/4