Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid

A technology of acid fracturing and acid diversion, which is applied in chemical instruments and methods, earthwork drilling, mining fluids, etc. It can solve problems such as short fractures, and achieve the effects of improving capacity, increasing effective length, and increasing production capacity

Inactive Publication Date: 2014-07-30
惠建龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-variable diverting acid adjustable fracture high-acid fracturing method, which solves the problem of short fractures in the prior art

Method used

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  • Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid
  • Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid
  • Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The polybasic acid in the polybasic acid-adjustable joint high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 70% of industrial hydrochloric acid with a mass concentration of 31%, 10% of formic acid with a mass concentration of 85%, CHS- 5 Acidified high-temperature corrosion inhibitor 1.5%, FRK-V180 high-temperature gelling agent 0.6%, TWJ acidified iron ion stabilizer 1.5%, SZJ-3 acidified fracturing aid drainage agent 0.3%, clear water 16.1%, the total content of the above components is 100%, the raw materials weighed above are added to the first acid tank, and then mixed by a pump truck;

[0072] The diverting acid in the multi-component diverting acid adjustable fracture high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 70% of industrial hydrochloric acid with a mass concentration of 31%, and 0.4% of CZD-2 repeated fracturing control and ...

Embodiment 2

[0077] The polybasic acid in the polybasic acid-adjustable seam high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 65% industrial hydrochloric acid with a mass concentration of 31%, 8% formic acid with a mass concentration of 85%, CHS- 5 Acidified high-temperature corrosion inhibitor 1%, FRK-V180 high-temperature gelling agent 0.4%, TWJ acidified iron ion stabilizer 1%, SZJ-3 acidified fracturing aid drainage agent 0.2%, clear water 24.4%, the total content of the above components is 100%, the raw materials weighed above are added to the first acid tank, and then mixed by a pump truck;

[0078] The diverting acid in the multivariate diverting acid adjustable fracture high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 75% of industrial hydrochloric acid with a mass concentration of 31%, and 0.6% of CZD-2 repeated fracturing control and diverting agent...

Embodiment 3

[0083] The polybasic acid in the polybasic acid-adjustable joint high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 80% of industrial hydrochloric acid with a mass concentration of 31%, 12% of formic acid with a mass concentration of 85%, CHS- 5 Acidified high-temperature corrosion inhibitor 2%, FRK-V180 high-temperature gelling agent 0.8%, TWJ acidified iron ion stabilizer 2%, SZJ-3 acidified fracturing aid drainage agent 0.4%, clear water 2.8%, the total content of the above components is 100%, the raw materials weighed above are added to the first acid tank, and then mixed by a pump truck;

[0084] The diverting acid in the multi-component diverting acid adjustable fracture high-acidification fracturing method of the present invention takes the following raw materials by mass percentage: 60% of industrial hydrochloric acid with a mass concentration of 31%, and 0.3% of CZD-2 repeated fracturing control and diver...

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Abstract

The invention discloses a fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid. The method comprises the steps: firstly preparing the polyatomic acid, the steering acid and common acid, and then simultaneously injecting a fracture control agent and the common acid into a target stratum of an oil-gas well; then injecting the polyatomic acid; injecting liquid nitrogen; injecting the polyatomic acid and the liquid nitrogen at the same time; injecting the liquid nitrogen again; injecting the liquid nitrogen and the steering acid at the same time; injecting the polyatomic acid and the liquid nitrogen at the same time again; injecting the common acid; finally discharging all liquid injected into a wellhead into a liquid discharging basin. According to the method disclosed by the invention, the polyatomic acid is used for preparing a long slit, the steering acid is used for dredging a micro crack, and the liquid nitrogen supplements the energy of the stratum; the polyatomic acid, the steering acid and the liquid nitrogen are injected into the stratum in a section plugging manner, so that the length of the slit is increased, the dredging capacity of the micro crack is improved, and quick liquid discharging is enhanced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and relates to a high-acidification fracturing method with adjustable multi-variable diverting acid. Background technique [0002] In carbonate rock acid fracturing, the key factors affecting the effect of acid fracturing are: the effective length of acid-etched fractures and the conductivity of acid-etched fractures after acid fracturing, and the effective length of acid-etched fractures is the low-permeability carbonate The key to acid fracturing of salt rock reservoirs. How to effectively obtain longer acid-etched fractures has always been a difficult problem to be solved in acid fracturing technology. Especially for deep carbonate reservoirs, it is more difficult to effectively extend acid-etched fractures. The technical difficulties mainly include: ① High reservoir temperature, high carbonate purity in the matrix, fast acid-rock reaction speed, acid liquid ②The development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27C09K8/72
Inventor 惠建龙杨勇武建义
Owner 惠建龙
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