Document:

First and Second Amendments to Schlumberger 2005 Stock Incentive Plan.

 Exhibit 10.5 
 SCHLUMBERGER 2005 STOCK INCENTIVE PLAN 
 (As Amended and Restated January 19, 2006) 

First Amendment 
 Schlumberger
Limited, a Netherlands Antilles corporation, having heretofore adopted the Schlumberger 2005 Stock Incentive Plan, as amended and restated January 19, 2006, and having reserved the right under Section 12 thereof to amend the Plan, does
hereby amend the Plan, generally effective January 17, 2008, or as otherwise specified below, as follows: 
  

	1.	Section 5(d)(i) of the Plan is hereby amended in its entirely to read as follows: 

 “(i) Exercise Schedule. Subject to the requirements of paragraphs (A) and (B) below, each Stock Option granted
hereunder shall be exercisable in one or more installments (annual or other) on such date or dates as the Committee may in its sole discretion determine and communicate to the optionee in communicating the grant of the option. 
 (A) No Stock Option may be exercised after the expiration of ten (10) years from the date such option is granted (the maximum term
established by the Committee with respect to a particular Stock Option is hereinafter referred to as the “Option Period”). 
 (B) Except in the case of death or disability (as described in Section 5(d)(iv)(B) or 5(d)(v)(B)), no Stock Option shall vest or become exercisable with respect to any portion of the shares of Common Stock thereunder unless and until
the recipient remains in the employment of the Company or a subsidiary for a period of at least one (1) year from the date of grant of the option (which provision shall not be construed to impair in any way the right of the Company or
subsidiary to terminate such employment).” 
  

	2.	Section 5(d)(iv) of the Plan is hereby amended in its entirely to read as follows: 

 Termination of Employment and Subsequent Events. 
 If the optionee’s employment
with the Company is terminated with the consent of the Company and provided such employment is not terminated for cause (of which the Committee shall be the sole judge), the Committee may permit such Stock Option to be exercised by such optionee at
any time during the period of three (3) months after such termination or the remainder of the Option Period whichever is less, provided that such option may be exercised only to the extent it was exercisable on the date of such termination.

 In the event an optionee dies while in the employ of the Company, any outstanding Stock Option shall automatically become
fully vested and exercisable by the person or persons entitled thereto under the optionee’s will or the laws of descent and distribution during the “Post-Death Exercise Period.” The Post-Death Exercise Period shall commence on the
date of the optionee’s death and shall end sixty (60) months thereafter or the remainder of the Option Period whichever is less. 
 In the event an optionee dies after termination of employment but prior to the exercise in full of any Stock Option which was exercisable on the date of such termination, such option may be exercised before expiration
of its term by the person or persons entitled thereto under the optionee’s will or the laws of descent and distribution during the Post-Death Exercise Period to the extent exercisable by the optionee at the date of death. For purposes of this
Section 5(d)(iv)(C), the Post-Death Exercise Period shall commence on the date of the optionee’s termination of employment and shall end sixty (60) months thereafter or the remainder of the Option Period whichever is less. 

If the optionee’s employment with the Company is terminated without the consent of the Company for any reason other than the
death of the optionee, or if the optionee’s employment with the Company is 

 
terminated for cause, his or her rights under any then outstanding Stock Option shall terminate immediately. The Committee shall be the sole judge of whether
the optionee’s employment is terminated without the consent of the Company or for cause. Notwithstanding the foregoing, if the optionee engages in “detrimental activity” (as hereinafter defined) within one year after termination of
employment for any reason other than retirement or disability, the Committee, in its discretion, may cause the optionee’s right to exercise such option to be forfeited. Such forfeiture may occur at any time after the Committee determines that
the optionee has engaged in detrimental activity and prior to the actual delivery of all shares of Common Stock subject to the option pursuant to the exercise of such option. If an allegation of detrimental activity by an optionee is made to the
Committee, the Committee, in its discretion, may suspend the exercisability of the optionee’s options for up to two months to permit the investigation of such allegation. In addition, if the optionee engages in detrimental activity within one
year following termination of employment for any reason other than retirement or disability, the Committee, in its discretion, may rescind any option exercise made within the period commencing six months preceding the date of the optionee’s
termination of employment and ending three months following such termination. For purposes of this Section 5, “detrimental activity” means activity that is determined by the Committee in its sole and absolute discretion to be
detrimental to the interests of the Company or any of its subsidiaries, including but not limited to situations where such optionee: (1) divulges trade secrets of the Company, proprietary data or other confidential information relating to the
Company or to the business of the Company and any subsidiaries, (2) enters into employment with a competitor under circumstances suggesting that such optionee will be using unique or special knowledge gained as a Company employee to compete
with the Company, (3) uses information obtained during the course of his or her prior employment for his or her own purposes, such as for the solicitation of business, (4) is determined to have engaged (whether or not prior to termination)
in either gross misconduct or criminal activity harmful to the Company, or (5) takes any action that harms the business interests, reputation, or goodwill of the Company and/or its subsidiaries.” 
  

	3.	Section 5(d)(v) of the Plan is hereby amended in its entirety to read as follows: 

 Retirement, Disability and Subsequent Events. 
 If the optionee’s employment with
the Company is terminated due to retirement, such Stock Option shall be exercisable by such optionee at any time during the period of sixty (60) months after such termination or the remainder of the Option Period, whichever is less (the
“Retirement Exercise Period”), provided that such option may be exercised after such termination and before expiration only to the extent that it is exercisable on the date of such termination. For purposes of this Section 5(d)(v),
“retirement” shall mean termination of the optionee’s employment with the Company and all affiliates at or after (i) age 55 or (ii) age 50 and completion of at least 10 years of service with the Company and all affiliates.

 If the optionee’s employment with the Company is terminated due to disability, such Stock Option shall automatically
become fully vested and exercisable. Such optionee may exercise the outstanding Stock Option at any time during (1) in the case of Stock Options intended to be incentive stock options within the meaning of Section 422 of the Code and
granted prior to January 17, 2008, the period of three (3) months after such termination or the remainder of the Option Period, whichever is less, or (2) in the case of all other Stock Options, the period of sixty (60) months
after such termination or the remainder of the Option Period, whichever is less (the “Disability Exercise Period”). For purposes of this Section 5(d)(v), “disability” shall mean such disability (whether through physical or
mental impairment) which totally and permanently incapacitates the optionee from any gainful employment in any field which the optionee is suited by education, training, or experience, as determined by the Committee in its sole and absolute
discretion. 
 In the event an optionee dies during the Retirement Exercise Period or the Disability Exercise Period, such
Stock Option may be exercised by the person or persons entitled thereto under the optionee’s will or the laws of descent and distribution to the extent exercisable by the optionee at the date of death and to the extent the term of the Option
Period has not expired within such Retirement Exercise Period or Disability Exercise Period. 

 Notwithstanding the foregoing, if the optionee engages in “detrimental
activity” (as defined in Section 5(d)(iv)(E)) within five years after termination of employment by reason of retirement or disability, the Committee, in its discretion, may cause the optionee’s right to exercise such option to be
forfeited. Such forfeiture may occur at any time after the Committee determines that the optionee has engaged in detrimental activity and prior to the actual delivery of all shares of Common Stock subject to the option pursuant to the exercise of
such option. If an allegation of detrimental activity by an optionee is made to the Committee, the Committee, in its discretion, may suspend the exercisability of the optionee’s options for up to two months to permit the investigation of such
allegation. In addition, if the optionee engages in detrimental activity within five years following termination of employment by reason of retirement or disability, the Committee, in its discretion, may rescind any option exercise made within the
period commencing six months preceding the date of the optionee’s termination of employment by retirement or disability and ending one year following such termination.” 
  

	4.	For the avoidance of doubt, in no event shall the provisions of this Amendment apply to any Stock Option held by an optionee whose employment terminated due to death or disability
prior to January 17, 2008. 

 SCHLUMBERGER 2005 STOCK INCENTIVE PLAN 
 (As Amended and Restated Effective January 19, 2006) 
 Second Amendment 

 Schlumberger Limited, a Netherlands Antilles corporation, having heretofore adopted the Schlumberger 2005 Stock Incentive Plan, as amended
and restated effective January 19, 2006 and as thereafter amended (the “Plan”), and having reserved the right under Section 12 thereof to amend the Plan, does hereby amend the second sentence of Section 2(b) of the Plan,
effective as of April 17, 2008, as follows: 
 “All decisions and selections made by the Committee pursuant to the provisions of the
Plan shall be made by a majority of its members; provided, however, that the Committee may delegate its authority to grant awards hereunder to the chairperson of the Committee or any other member of the Committee to act in his or her absence,
subject to such terms, conditions and limitations as the Committee may prescribe in its discretion.”First Amendment to Schlumberger 2008 Stock Incentive Plan.

 Exhibit 10.6 
 SCHLUMBERGER 2008 STOCK INCENTIVE PLAN 
 (As Established Effective January 17, 2008) 

First Amendment 
 Schlumberger
Limited, a Netherlands Antilles corporation, having heretofore adopted the Schlumberger 2008 Stock Incentive Plan, as established effective January 17, 2008 (the “Plan”), and having reserved the right under Section 12 thereof to
amend the Plan, does hereby amend the second sentence of Section 2(b) of the Plan, effective as of April 17, 2008, as follows: 
 “All decisions and selections made by the Committee pursuant to the provisions of the Plan shall be made by a majority of its members; provided, however, that the Committee may delegate its authority to grant awards hereunder to the
chairperson of the Committee or any other member of the Committee to act in his or her absence, subject to such terms, conditions and limitations as the Committee may prescribe in its discretion.”

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