Document:

EX-10.21

 EXHIBIT 10.21 

FOURTH AMENDMENT TO GAS GATHERING AND TREATING AGREEMENT 

THIS FOURTH AMENDMENT TO GAS GATHERING AND TREATING AGREEMENT (this “Fourth Amendment”) is made by and between SWEPI LP
(“Shipper”) and CENTERPOINT ENERGY FIELD SERVICES, LLC, successor by conversion to CenterPoint Energy Field Services, Inc. (“Gatherer”) effective this 1st day of September,
2011. 
 Background 

Gatherer and Shipper are Parties to that certain Gas Gathering and Treating Agreement dated April 29, 2010, as amended (the
“GGA”). Capitalized terms used herein, if not defined herein, will have the meaning given to such terms in the GGA; and 
 The
Parties now desire to further amend the GGA as set forth herein. 
 NOW, THEREFORE, for adequate consideration received and acknowledged,
the Parties hereto agree as follows: 
  

	1.	Shipper’s Production Forecast. Section 3.2(c) is hereby added to the GGA to state in its entirety, “No less frequently than once each calendar quarter, Shipper will provide to Gatherer written
projections of the total Gas volumes that Shipper reasonably expects to deliver for Gathering hereunder during each month of the immediately following 12-month period (each, a “Shipper’s Production
Forecast”). 

  

	2.	Deletion of 1000 gpm Amine Plant at Chatman. 

  

	 	a.	The table entitled “Initial Build Schedule” on Exhibit “D” to the GGA provides that Gatherer will complete construction of a “1000 gpm Amine Plant at Chatman” on or before
September 30, 2011. The Parties agree effective September 26, 2011 to remove from the GGA Gatherer’s obligation to construct the 1000 gpm Amine Plant at Chatman. The Parties acknowledge and agree that although there was no completed
1000 gpm Amine Plant at Chatman by September 30, 2011, Gatherer did not breach the GGA. The Parties hereby delete “1000 gpm Amine Plant at Chatman” from the Initial Build Schedule on Exhibit D of the GGA. 

 

	 	b.	The table entitled “Initial Build Treating” on Exhibit “C” to the GGA provides Inlet and Outlet CO2 levels, and a capacity of 180 MMscfd for the 1000 gpm plant at Chatman. In light of the
Parties’ removal of the 1000 gpm amine plant at Chatman from the GGA, the Parties hereby delete the entire “Chatman” row of the table entitled “Initial Build Treating” on. Exhibit “C” to the GGA. 

 

	3.	Deletion of Mansfield Interconnect into Enterprise’s Haynesville Extension (a/k/a Chatman interconnect into Enterprise’s Haynesville Extension a/k/a Enterprise Haynesville Extension Tap a/k/a Haynesville
Extension Interconnection). 

	 	a.	The Parties acknowledge that section 5.7(b) of the GGA refers to the “Mansfield interconnect into Enterprise Haynesville Extension.” The Parties also variously referred to such facility in the GGA as the
“Chatman Interconnect into Enterprise’s Haynesville Extension,” the “Enterprise Haynesville Extension Tap” and the “Haynesville Extension Interconnection.” The Parties now agree that all references to such facility
in the GGA will be deemed to state the “Haynesville Extension Interconnection.” Section 5.7(b) of the GGA provides, among other things, that Gatherer will construct at Gatherer’s cost for Shipper and Shipper Partner the Haynesville
Extension Interconnection. The Parties have agreed effective September 26, 2011 to remove from the GGA Gatherer’s obligation to construct the Haynesville Extension Interconnection. Effective September 26, 2011, the Parties hereby
amend Section 5.7(b) and item #2 of the “To Be Constructed” section of Exhibit Ito state in its entirety “left intentionally blank.” Notwithstanding the above, the $4,500,000 sum set forth in Section 5.7 as available for
constructing the Haynesville Extension Interconnection shall remain available for the construction of additional interconnects as described in the last paragraph of Article 5.7 of the GGA. 

 

	 	b.	The table entitled “Initial Build Schedule” on Exhibit “D” to the GGA provides that Gatherer will complete construction of the Haynesville Extension Interconnection on or before September 30,
2011. As stated above the Parties have agreed to remove from the GGA Gatherer’s obligation to construct the Haynesville Extension Interconnection. Effective September 26, 2011 the Parties hereby delete “Enterprise Haynesville
Extension Tap” from the Initial Build Schedule on Exhibit D of the GGA. 

  

	4.	Third Party Gas. Effective October 1, 2011, the Parties amend and restate in its entirety Section 9.4 of the GGA as follows: 

 

	 	a.	Any Gas delivered by a party other than the Preferential Capacity Shippers (collectively, “Third Party Gas”), as well as all Undedicated Shipper Gas, shall be treated as Shipper Gas for purposes of calculating
the Annual Volume Commitments and Total Volume Commitment. 

  

	 	b.	The Parties acknowledge that Shipper and Gatherer are also parties to that certain Gas Gathering and Treating Agreement between Shipper and Gatherer dated September 1, 2009 (“Magnolia GGA”) covering the
Magnolia Gathering System. The term “Magnolia Gathering System” as used herein will have the meaning given to such term in the Magnolia GGA. The term “Magnolia Contract Year” means the
one-year period of time from each September 1 continuing to August 31 of the following year. Shipper Partner and Gatherer are also parties to a like agreement covering the Magnolia Gathering System
(the “Partner Magnolia GGA”), Shipper Partner and Gatherer are also parties to a like agreement covering the Olympia Gathering System (the “Partner Olympia GGA”). 

  
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	 	c.	Third Party Gas that originates west of the Red River, whether such gas is delivered into the Olympia Gathering System or the Magnolia Gathering System, will be referred to herein as “Western TPG”.

  

	 	d.	Notwithstanding that Third Party Gas will be credited as provided in Paragraphs (a) and (e), the Parties agree that beginning October 1 of 2011 and September 1 of each succeeding year of the Primary Term
of the Magnolia GGA, all Western TPG will be excluded from the quantity of Third Party Gas credited toward the Annual Volume Commitment and the Total Volume Commitment of Shipper under this GGA, Magnolia GGA, Partner Magnolia GGA and Partner Olympia
GGA until the point in time each Magnolia Contract Year that the Western TPG delivered under the GGA, Magnolia GGA, Partner Magnolia GGA and Partner Olympia GGA after September I of the applicable Magnolia GGA Contract Year collectively equals
62.4 million MMBtu. After that point in time each Magnolia Contract Year, if it occurs, Western TPG delivered into the Olympia Gathering System for the remainder of the applicable Magnolia Contract Year will be credited as with all other Third
Party Gas delivered hereunder. This exclusion of a portion of Western TPG from the calculation of the Annual Volume Commitment and Total Volume Commitment of Shipper and Shipper Partner does not otherwise affect the credit for Third Party Gas
provided in this Section 9.4. 

  

	 	e.	Gatherer shall apply Third Party Gas to the Shipper Gas Volume Commitment solely on an MMBtu to MMBtu (i.e., 1:1) basis. Gas delivered by Preferential Capacity Shippers from outside the Committed Area will first be
credited to the respective Shipper or Shipper Partner. The balance of Third Party Gas shall be allocated between Shipper and Shipper Partner calculated as a ratio: (i) the numerator of which is Shipper Gas delivered to the Olympia Gathering
System, and (ii) the denominator of which is (x) Gas delivered by Shipper Partner from within the Committed Area plus (y) Shipper Gas delivered to the Olympia Gathering System. Any amount by which the volume of actual Gas delivered by
Shipper in a Contract Year exceeds the Annual Volume Commitment for the corresponding year (“Excess Delivered Volumes”) shall be deemed part of the volume of actual Gas delivered for the next annual Volume Shortfall calculation. Unapplied
Excess Delivered Volumes shall continue to carry forward until used to satisfy a committed quantity or until all commitment years have elapsed. If Shipper has met its Total Volume Commitments under the terms of this Section 9 and/or
Section 6 of this Agreement, then such Excess Delivered Volumes shall be applied to Shipper Partner’s Annual Volume Commitments. 

  

	5.	Except as expressly amended herein, the GGA remains in effect as originally written and previously amended. 

  
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 IN WITNESS WHEREOF, this Fourth Amendment is executed as of the 15th day of December, 2011. 
  

			
	 SHIPPER:
 SWEPI LP

		
	By:	 	 /s/ Robert Cowan

	Name:	 	Robert Cowan
	Title:	 	Attorney-In-Fact
	
	 GATHERER:

CENTERPOINT ENERGY FIELD SERVICES, LLC

		
	By:	 	 /s/ William H. May, Jr.

	Name:	 	William H. May, Jr.
	Title:	 	Sr. V.P. & CCO

  
 4EX-10.22

 EXHIBIT 10.22 

Specific Terms in this Exhibit have been redacted because confidential treatment for those terms has been requested. The redacted material has been separately
filed with the Securities and Exchange Commission, and the terms have been marked at the appropriate place with three asterisks [***]. 

FIFTH AMENDMENT TO GAS GATHERING AND TREATING AGREEMENT 

THIS FIFTH AMENDMENT TO GAS GATHERING AND TREATING AGREEMENT (this “Fifth Amendment”) is made by and between SWEPI LP
(“Shipper”) and CENTERPOINT ENERGY FIELD SERVICES, LLC, successor by conversion to CenterPoint Energy Field Services, Inc. (“Gatherer”) effective this 1st day of September,
2011 (the “Effective Date”). 
 Background 

Gatherer and Shipper are Parties to that certain Gas Gathering and Treating Agreement dated April 29, 2010, as amended (the
“GGA”), and that certain separate Gas Gathering and Treating Agreement dated September 1, 2009, as amended (the “Magnolia GGA”); and 

The Parties now desire to further amend the GGA as set forth herein. Capitalized terms used herein, if not defined herein, will have the
meaning given to such terms in the GGA. 
 NOW, THEREFORE, for adequate consideration received and acknowledged, the Parties hereto agree as
follows: 
  

	1.	Revisions to the Interconnection Credit. 

  

	 	a.	The Parties hereby acknowledge that Section 5.7(c) of the GGA provides, if Gatherer has not spent at least $4,500,000.00 in constructing the Haynesville Extension Interconnection, then the difference between
$4,500,000.00 and the cost to Gatherer of constructing the Haynesville Extension Interconnection (the “Interconnection Credit”) will be available for the construction of additional Interconnections as designated by Shipper and Shipper
Partner, collectively, in writing to Gatherer. By a separate amendment, the Parties have mutually agreed to remove Gatherer’s obligation to construct the Haynesville Extension Interconnection, thus maintaining an Interconnection Credit of
$4,500,000.00 potentially available for construction of additional interconnections designated collectively by Shipper and Shipper Partner. 

  

	2.	The 2010 Interconnections. 

  

	 	a.	Pursuant to Section 7 of the GGA, Gatherer has installed the following interconnections at the corresponding costs (the “Gross 2010 Interconnections Costs”) at the request of Shipper and Shipper Partner:

					
	 2010 Interconnections
	  	Construction Costs	 
	 Interconnection with Regency - EOR
	  	$	2,655,000	 
	 Interconnection with Tiger - EOR
	  	$	1,353,000	 
	 Interconnection with Tiger - WOR
	  	$	2,682,000	 
	 Interconnection with Enterprise - Clear Lake
	  	$	500,000	 
		  	  
	  
	 
	 Gross 2010 Interconnections Costs
	  	$	7,190,000	 
		  	  
	  
	 

  

	 	b.	The Parties acknowledge that Section 5.7(c) of the GGA refers to the “Robeline interconnect into Gulf South Pipeline.” The Parties also referred to such facility in the GGA as the “Gulf South Legacy
Tap.” The Parties now agree that all references to such facility in the GGA will be deemed to state the “Robeline Interconnect.” The Parties previously agreed that Gatherer suspend installation of the Robeline Interconnect. The
Parties have now subsequently agreed that Gatherer will not install the Robeline Interconnect. The Parties hereby amend Section 5.7(c) and item #3 of the “To Be Constructed” section of Exhibit Ito state in its entirety “left
intentionally blank.” The Parties also hereby delete “Gulf South Legacy Tap” from the Initial Build Schedule on Exhibit D of the GGA. As a result of the deletion of the Robeline Interconnect from the Olympia Gathering System Initial
Build, Shipper and Shipper Partner will receive a combined credit of the estimated Robeline Interconnect construction costs in the amount of [***] against the Gross 2010 Interconnections Costs (as stated in the table above). Accordingly, applying
said credit to the Gross 2010 Interconnections Costs yields a “Net 2010 Interconnection Costs” of [***]. Gatherer will also apply the [***] Interconnection Credit available to Shipper and Shipper Partner to the [***] Net 2010
Interconnection Costs. 

  

	 	c.	There will not be an additional Gathering Fee for the construction and operation of the 2010 Interconnections; provided, no later than December 31, 2011, Shipper pays Gatherer the amount of [***] which represents
Shipper’s one-half (with Shipper Partner bearing the other one-half) of the difference after applying the [***] Interconnection Credit to the [***] Net 2010
Interconnection Costs as provided herein. 

  

	 	d.	The Parties hereby waive the procedural requirements of Section 7.2 of the GGA as it relates to the 2010 Interconnections. Simultaneously with entering into this Amendment, the Parties are executing that certain
Additional Interconnection Election, a copy of which is attached hereto and made a part hereof, documenting Shipper’s request for Gatherer to construct and maintain the 2010 Interconnections. 

 

	3.	Except as expressly amended hereby, the GGA remains in effect as originally written. 

  
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 IN WITNESS WHEREOF, this Fifth Amendment is executed as of the 15th day of December, 2011. 
  

									
	SWEPI LP	 		 	CENTERPOINT ENERGY FIELD SERVICES, LLC
					
	By:	 	 /s/ Robert Cowan
	 		 	By:	  	 /s/ William H. May, Jr

	Name:	 	Robert Cowan	 		 		  	William H. May, Jr.
	Title:	 	Attorney-In-Fact	 		 		  	Senior Vice President and
		 		 		 		  	Chief Commercial Officer

  
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 ADDITIONAL SERVICES ELECTION 

(2010 Interconnections) 

THIS ADDITIONAL SERVICES ELECTION (this “Election”) is made this 1st day of
September, 2011 (the “Effective Date”) by and between SWEPI LP (“Shipper”), and CENTERPOINT ENERGY FIELD SERVICES, LLC, successor by conversion to Centerpoint Energy Field Services, Inc. (“Gatherer”). Shipper and
Gatherer may be referred to individually as a “Party,” or collectively as the “Parties.” 
  

	1.	Gatherer and Shipper are Parties to that certain Gas Gathering and Treating Agreement dated April 29, 2010, as amended (the “GGA”). 

 

	2.	Shipper elects pursuant to Section 7.2 of the GGA to have Gatherer install and operate the following interconnections (the “2010 Interconnections”): 

Interconnection with Regency - EOR; 

Interconnection with Tiger - EOR; 

Interconnection with Tiger - WOR; and 

Interconnection with Enterprise - Clear Lake. 
  

	3.	There will not be an additional Gathering Fee for the construction and operation of the 2010 Interconnections; provided, Shipper pays Gatherer the amount of $745,000 on or before December 31, 2011.

 IN WITNESS WHEREOF, the Parties have executed this Election on the date first set forth above. 

 

									
	 SHIPPER:
 SWEPI LP
	 		 	 GATHERER:
 CENTERPOINT ENERGY FIELD
SERVICES, LLC

					
	By:	 	 /s/ Robert Cowan
	 		 	By:	  	 /s/ William H. May, Jr

	Name:	 	Robert Cowan	 		 		  	William H. May, Jr.
	Title:	 	Attorney-In-Fact	 		 		  	Senior Vice President and
		 		 		 		  	Chief Commercial Officer

  
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