OIL AND GAS WELL SLOTTING PERFORATION TECHNOLOGY PROFESSIONAL SERVICE

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Any process/project related to development / completion / recompletion oil or gas well begins from thorough geophysical and geological analysis. 

 

During analysis identifies the possible causes of productive flow rate fall, most promising and missed productive intervals,possible residual reserves, most effective ways to develop, restore or treatment well, defines the most promising cutting intervals, calculated technological parameters and step by step works plan (Cut Program).

 

For geophysical and geological analysis the following information is necessary:

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  • area map with neighbors wells (preferably geological map with an altitudes)

  • well history (tests results, development, deployment, exploitation, termination, treatment)

  • monthly debit (oil, gas, water, pressure)

  • all available logs (electric-induction, gamma-ray, neutron, acoustic, density, multi-logging, chat-log, etc.)

  • all available analyzes (core, formation, rock)

  • similar information about neighboring wells

When Cuts Program is defined, begins well-site preparation process (SPT process organization similar to abrasive jetting perforation or hydraulic fracturing process):

 

  • rig with crew

  • surface piping, low pressure line

  • wellhead, tubing

  • water tank

  • cutting tank with vibrator

  • frack-pump service with crew

  • frack-van (monitoring center)

  • blender (mixer)

  • high pressure line

  • manifold unit

  • formation water

  • abrasive filler

SPT procedure also can be performed with using coiled tubing.

SPT/HSP tool is able to keep a central position in the well. It is allows to make a continuation slots along the horizontal wellbore. In this case opening area (hydrodynamic contact zone) is located along the productive formation (within the productive horizon). Using a special self-oriented perforators is possible to orient the required directions of cutting slots in the horizon wells.

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        Process consists of the following operation's stages:

 

  • lowering HSP tool to the predetermined depth

  • logging - correlation

  • correction of first cutting interval position

  • surface equipment test

  • tubing pressure test (optional)

  • reverse flushing (if tubing test)

  • cutting first interval

  • direct flushing

  • lifting HSP tool for next cutting interval

  • cutting second interval

  • direct flushing

  • lifting HSP tool for next cutting interval

  • cutting third interval

  • direct flushing

  • process is repeated until the last cutting interval

  • direct flushing

  • lifting HSP tool to the surface

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SURFACE EQUIPMENT AND STAGES OF HSP PROCESS

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PROCEDURES COMPATIBLE WITH HSP PROCESS

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CALCULATION OF MINIMAL OPENING PENETRATION AREA

Take one slot with sides a, b, c. Take the minimum value of the slot sides:

 

  • a=3 foot (up to 5 foot)

  • b=1 linear foot

  • c=1 inch=0.083 foot (up to 2 inches)

Opening penetration area will be equal:

 

(left side)+(right side)+(top part)+(bottom part)+(back side)=(axb)+(axb)+(axc)+(axc)+(bxc)=(3x1)+(3x1)+(3x0.083)+(3x0.083)+(1x0.083)=3+3+0.25+0.25+0.083=6.58

 

  • one slot = 6.58 ft²

  • two slots = 13.2 ft²

  • three slots = 19.7 ft²

  • four slots = 26.3 ft²

Conclusion: SPT process made with 4 nozzles opening penetration area equal 26 square feet per each linear foot.

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HSP PROCESS IN HORIZONTAL WELLS

SLOTTING PERFORATION PROCESS