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Method for controlling extension of reservoir fracturing fracture of oil-gas field

A technology for reservoir fracturing and oil and gas fields, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc.

Active Publication Date: 2013-03-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the construction is completed, carry out oil test and drainage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the application under the reservoir condition of 55°C as an example.

[0020] The ratio of various components of the modified ceramsite is 35:53:12 among ceramsite, reinforcing filler and resin. Reserve after processing and granulating.

[0021] Measure 100mL of modified ceramsite, stir and mix with 14mL curing agent in 667mL of 0.35% hydroxypropyl fracturing fluid system (15% sand ratio) for 5 minutes and place it in a water bath at 55°C for reaction. The curing starts at 50 minutes and completes at 65 minutes. solidify. A universal testing machine is used to test the force on a sample with a diameter of 2.54cm and a length of 4.85cm. The axial compressive strength of the steering agent is 34.7MPa, and the radial compressive strength is 19.9MPa.

Embodiment 2

[0023] Take the application under the reservoir condition of 75°C as an example.

[0024] The ratio of various components of the modified ceramsite is 37:53:10 among ceramsite, reinforcing filler and resin. Reserve after processing and granulating.

[0025] Measure 100mL of modified ceramsite, stir and mix with 11mL curing agent in 500mL of 0.4% hydroxypropyl fracturing fluid system (20% sand ratio) and place it in a water bath at 75°C for 5 minutes to react. The curing starts at 45 minutes and completes at 55 minutes. solidified. A universal testing machine is used to test the force on a sample with a diameter of 2.54cm and a length of 4.94cm. The axial compressive strength of the steering agent is 38.1MPa, and the radial compressive strength is 24.1MPa.

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Abstract

The invention relates to a method for controlling the extension of a reservoir fracturing fracture of an oil-gas field. In a fracturing construction process, the base fluid of fracturing fluid carries modified porcelain granules and a curing agent, and after entering the fracture, the modified porcelain granules and the curing agent undergo reaction for 40 to 90 minutes under a reservoir condition to form a high-strength impermeable barrier layer. Reaction time is controllable and the method can be applied to reservoirs of 45 to 90 DEG C. The barrier layer can bear differential pressures above 5 MPa and has a stable structure in a high-temperature brine state. The impermeable barrier layer with relatively higher pressure bearing strength is cured and formed in the fracture, thereby not only slowing down the excessive downward extension of the fracture into a water layer, but also preventing the water layer from being fractured through to cause the coning of bottom water.

Description

Technical field: [0001] The invention relates to a modified ceramsite and a curing agent carried by a fracturing fluid base fluid. After entering a fracture, the two react under formation conditions for a certain period of time to form a high-strength, non-permeable barrier layer to control fracturing fractures in oil and gas field reservoirs. extended method Background technique: [0002] During hydraulic fracturing, how to control the growth of fracture height has been a difficult problem for a long time. Controlling the fracture height within the production layer (target layer) is one of the key factors for the success of hydraulic fracturing. Studies have shown that the stress difference between formations is the main condition to control the growth of fracture height. When the stress difference between the oil-gas layer and the upper and lower interlayers is 2.07-3.45 MPa, it is enough to control the vertical extension of fractures within the production layer; but , w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/17
Inventor 徐永高赵振峰李宪文赵文丁里吕伟尹晓宏薛小佳刘静周晓群吕海燕吴江李斌
Owner PETROCHINA CO LTD
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