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A fracturing fluid capable of self-generating acid, its preparation method and application

A fracturing fluid and acid-generating technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems that have not been mentioned, and achieve the effect of effective acid etching

Active Publication Date: 2020-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Liu Youquan, Zhang Qian, etc. (CN102399550 A) of China National Petroleum and Natural Gas Co., Ltd. (CN102399550 A) invented an acid fracturing liquid for deep acidification of high-temperature carbonate rocks. It is formulated and contains a certain amount of surfactant thickened to carry self-generated acid. After acid generation [H + ] = 2.2-4mol / L, gradually generate acid at 60-150°C to realize deep acidification. The effect of effective acid etching in the crevice has not been mentioned

Method used

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  • A fracturing fluid capable of self-generating acid, its preparation method and application
  • A fracturing fluid capable of self-generating acid, its preparation method and application
  • A fracturing fluid capable of self-generating acid, its preparation method and application

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Embodiment

[0028] This embodiment provides a self-generating acid fracturing fluid suitable for effective acid fracturing in the front section of fractures in high-temperature deep well carbonate rock reservoirs. In terms of mass percentage, the components of the acid fracturing fluid are as follows:

[0029] 15% ethyl lactate, 8% ethyl acetate, 0.6% AA / AM / AMPS copolymer, 2% polylactic acid and the balance water.

[0030] The self-generating acid fracturing fluid is prepared by the following steps:

[0031] Add water, ethyl lactate, and ethyl acetate to the container in proportion and stir evenly, add a thickener to it under stirring, stir for 20 minutes until it swells completely, add a degradable fluid loss reducer and stir to disperse evenly, and obtain A fracturing fluid that is self-generating acid.

[0032] Take an appropriate amount of the above-mentioned fracturing fluid that can self-generate acid and put it into a high-temperature and high-pressure reactor that can be sampled ...

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Abstract

The invention relates to fracturing fluid capable of automatically generating acid, and a preparation method and application thereof. The fracturing liquid is prepared from the following raw materials by mass percent: 10 to 40 percent of organic ester, 0.3 to 1 percent of thickening agent, 1 to 4 percent of degradable filtrate reducer and the balance of water. The fracturing fluid not only satisfies the filtrate loss reduction performance of the water-base fracturing fluid to perform the fracture forming, but also can slowly generate acid under a stratum high temperature condition to acid etch a stratum, so that the effective acid etching of a front section of a crack can be realized.

Description

technical field [0001] The invention relates to a self-generating acid fracturing fluid suitable for effective acid fracturing in the front section of fractures of high-temperature deep well carbonate rock reservoirs, a preparation method and application thereof, and belongs to the technical field of acidizing fracturing fluid systems for petroleum development. Background technique [0002] According to relevant statistics, more than 50% of the world's oil and gas production comes from carbonate reservoirs. In recent years, a number of deep and ultra-deep carbonate reservoirs have been discovered and put into development. This type of oil and gas reservoir has the characteristics of deep burial, high formation temperature, serious reservoir heterogeneity, low permeability, difficult development, and low natural production rate, and most of them need acid fracturing. [0003] The key factors affecting the effect of acid fracturing are the conductivity and effective length of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/725C09K8/74E21B43/26
Inventor 高莹杨贤友连胜江石阳熊春明周福建李福涛王萌韩秀玲李向东王贵峰
Owner PETROCHINA CO LTD