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A composite drag-reducing retarded acid for acid fracturing in deep wells

A technology of retarding acid and resistance reduction, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of difficulty in entering and communicating micro-fractures, acid fracturing technology is difficult to meet actual requirements, and carbonate reservoirs are buried. problems of depth

Active Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The high-temperature carbonate reservoirs in the west have a large burial depth and high reservoir temperature. Due to the high frictional resistance during the acid liquid pumping process, it is difficult to further increase the displacement. The conventional acid fracturing technology at this stage is difficult to meet the actual requirements.
At the same time, high-viscosity acid often causes excessive corrosion to the main fractures, making it difficult to enter and communicate with micro-fractures, which affects the overall reconstruction volume

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 0.3% drag reducing agent by weight percentage, 0.3% thickening agent, 0.5% wetting agent, 5.0% speed retarder, 1.0% corrosion inhibitor, 1.0% iron ion stabilizer, 1.0% demulsifier, 1.0% drainage aid, the balance is mixed with hydrochloric acid with a mass concentration of 20%, and stirred evenly, to prepare a composite drag-reducing retarded acid 1.

Embodiment 2

[0030] 0.5% drag reducing agent by weight percentage, 0.3% thickening agent, 0.5% wetting agent, 5.0% speed retarder, 1.0% corrosion inhibitor, 1.0% iron ion stabilizer, 1.0% demulsifier, 1.0% drainage aid, the balance is mixed with hydrochloric acid with a mass concentration of 20%, stir evenly, and prepare compound drag-reducing retarded acid 2.

Embodiment 3

[0032] 0.1% drag reducing agent by weight percentage, 0.3% thickening agent, 0.5% wetting agent, 5.0% speed retarder, 1.0% corrosion inhibitor, 1.0% iron ion stabilizer, 1.0% demulsifier, 1.0% drainage aid, the balance is mixed with hydrochloric acid with a mass concentration of 20%, stir evenly, and prepare compound drag-reducing retarded acid 3.

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Abstract

The invention belongs to the field of petroleum development, and specifically provides a composite drag-reducing retarded acid used in deep well acid fracturing. The formula of the composite drag-reducing retarded acid comprises: 0.02-3% of drag-reducing agent, thickener 0.1-1%, wetting agent 0.1-2%, retarder synergist 1-10%, corrosion inhibitor 1-5%, iron ion stabilizer 1-3%, demulsifier 1-3%, drainage aid 1-3%, the rest is carrier fluid. The composite drag-reducing retarded acid has a good drag-reducing effect, can meet the use requirements of deep well acid fracturing, effectively reduces friction during construction pumping, and can make it easier for acid to enter and communicate with micro-cracks.

Description

technical field [0001] The invention belongs to the field of petroleum development, and in particular relates to a composite drag-reducing retarded acid used for acid fracturing in deep wells. Background technique [0002] Acid fracturing stimulation technology is the main stimulation and stabilization measure for oil wells in carbonate reservoirs and complex lithology reservoirs to increase single well production, and it is also an effective measure for removing plugging near the wellbore of water injection wells, reducing injection pressure and increasing water injection volume. The acid liquid is injected into the formation, and the acid liquid can dissolve the blockage in the seepage channel or create artificial fractures to reduce the drainage resistance, increase the formation permeability, and improve the recovery rate of oil and gas wells. [0003] Patent document CN103045226A discloses a kind of slick water fracturing fluid, which is formulated by drag reducing agen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/88C09K8/68
CPCC09K8/602C09K8/604C09K8/68C09K8/74C09K8/882
Inventor 崔佳张汝生林鑫赵梦云苏建政张锁兵史爱萍
Owner CHINA PETROLEUM & CHEM CORP