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Staged Hydraulic Fracture Stimulation (Multiple Stage)

  

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Clay Exploration, Inc. 

bulletQuarry No.1 "H"orizontal 
bulletGrimes County, Texas
bullet2005 Deep Gas Isolation Fracture Stimulation Project

Summary:  

            The subject sidetrack was drilled utilizing under-balanced drilling practices and an initial completion attempted in November of 2002 utilizing Grey Wolf rig 702. When attempting to run the production packer the packer was "stacked out" with excess compression resulting in a catastrophic failure and subsequent fishing operations. Traditionally these wells must be immediately "cleaned up" post the under-balanced drilling operations in order to evacuate cuttings and other drilling debris from the flow paths in the well bore. This did not occur in a timely manner and the debris remains blocking the flow paths.

             Remedial coiled tubing operations were conducted in an attempt to evacuate the wellbore of debris bridges. Due to curve severity the mechanical integrity of the coiled tubing string was exceeded and the CT parted depositing a 201foot long 1.93" OD obstruction in the barefoot production liner from approximately 15,560'+- to 15359'+-. (See schematic.) A failed attempt was made to recover the barefoot production liner.

Objective: 

            To plan, implement and establish productivity to the wellbore hydraulically utilizing staged acid assisted, high rate water fracture stimulation thereby isolating "broken back" intervals with a fluid and temperature naturally degrading LCM agent thus allowing stimulation to reach and open up the individual productive intervals at the extremity of the lateral. (See "shows".)

Well-bore Detail (Schematic attached hereto):

7 5/8"   Production Casing  0 - 14,080 ft (DPM)

            Outer Diameter - 7.625 in P110 LTC

            Inner Diameter -   6.765 in

            Linear Weight  33.7 lbm/ft

BEGIN SIDETRACK WINDOW 14,112-14,125 DPM 10/28/02

 2 7/8"   Production Tubing  0 - 13,198'

            Outer Diameter  -  2.875" P-110 CS Hydrill

            Inner Diameter  -  2.441"

            Linear Weight  6.5 ppft                                        

3 1/2"   Barefoot Production Liner - 13,636 ft. DPM - 16,494 ft. DPM

            Outer Diameter - 3.500" KSI PH-6 13 Chrome

            Inner Diameter - 2.750 "

            Linear Weight  - 12.95 lb/ft

            footage - 2,842.63 ft.

            perforated footage3,77ft at 4 SPF 

*Barefoot Production Liner Detail attached hereto. 

**Directional Survey attached hereto.

 AUSTIN CHALK  16394 - 16494 ft (MD)

            Pore Pressure - 8000 psig

            Static Temperature  - 360 degF

            Fracture Gradient  -  0.79 psi/ft

Austin Chalk Formation  16394 - 16494 ft (MD) 13900 - 14291.56 ft (TVD)

Shows:   

  A. 14550 to 14900 DPM in target on top of ash lost 8bbls 10.9 MW.

  B. 15,111' DPM 267deg temp spike MW 10.9 4' flare 11/6/02    

  C. 15,206 DPM 4' flare MW 10.7 11/07/02 

  D. 15274-302 DPM  (175psi returns)  MW  10.8  10' flare 11/08/02 

  E.  UTC Fracture at 15375 (+-) DPM  

  F.  15847-853 DPM (120psi returns) MW 10.7 6' flare 11/10/02 

  G. 16050 DPM 15' flare 8bbl gain MW 10.7 11/13/02 Note: AT 16050 MD, 14214 TVD 1990 VS TEMP SPIKED FROM 267 DEG F TO 270 DEG. FLOW RATE UP FROM 28% TO 45%. BOTTOMS UP FROM THIS CUT 10.9 PPG MUD TO 10.3. FLARE HEIGHT WAS 10'-15'. GAINED 5 BBLS MUD. SINCE THEN FLOW AS BEEN FLUCTUATING UP AND DOWN WITH PIT GAINS AND LOSSES OF +- 8 barrels.                                                                                                                                          

  H. 16165-169 DPM 20' flare  MW 11.7 11/16/02

  I. 16182-195 DPM  220 psia incr. returns 20' flare MW 11.7 11/16/02          

  J.  16230-235 DPM (222psi returns incr. MW 11.7 ) 20' flare 11/16/02

  K. 16318 to 325 DPM (160psi returns) +9bbl gain MW 11.7ppg 35' flare 11/16/02 

  L. 16342 to 355 (136psi returns) 11.7ppg MW 20' flare 11/16/02

  M. 16426 to 16402 DPM (700 psi returns) MW 11.7ppg  35'+ flare11/17/02          

  N. 16487 to 16468  DPM ROP increased to 98.8 MW11.7ppg.  30'+ flare 11/17/02

 

 

 

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