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A method for acid fracturing of carbonate reservoirs

A carbonate reservoir and acid fracturing technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., to achieve the effect of ensuring stable production period, improving long-term diversion capacity, and expanding the volume of acid etching reconstruction

Active Publication Date: 2018-07-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] Aiming at the deficiencies in the prior art, the present invention provides an acid fracturing method for carbonate rock reservoirs, which can effectively carry out acid fracturing transformation of the reservoirs, and can solve the problem of acid fracturing of ultra-high temperature and ultra-deep carbonate rock reservoirs. To realize the effective transformation of this type of reservoir

Method used

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Examples

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Embodiment Construction

[0031] The following examples are only used to further illustrate the present invention, but do not limit the present invention.

[0032] It should be noted that reagents commonly used in the art as gelling agents, corrosion inhibitors, demulsifiers, drainage aids, iron ion stabilizers, thickeners and crosslinking agents can be used in this application. The density of the reagents described in the following examples is measured at the same temperature, and similarly, the viscosity is also measured at the same temperature.

[0033] Well A is a pilot test well in a deep high-temperature carbonate rock in a certain block of an oilfield. The lithology of the acid fracturing section is gray micritic limestone. The pressure gradient is 1.032MPa / 100m. Using the new acid fracturing method for carbonate reservoir network proposed in this patent, the acid fracturing scheme design and field pilot test were carried out. The specific implementation method is as follows:

[0034] ①The fra...

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Abstract

The invention relates to an acid fracturing method of a carbonate rock reservoir. The acid fracturing method comprises the sequential steps that a, slickwater is used for conducting pretreatment on the reservoir; b, low viscosity acid liquor and slickwater are sequentially injected; c, medium / high viscosity acid liquor, low viscosity acid liquid and slickwater are sequentially injected; d, displacing liquid is injected at a displacing stage. According to the acid fracturing method, the process thought is concise, operation and implementation are facilitated in the site, the multiple bottleneck problems in acid fracturing of ultra-high temperature and ultra-deep carbonate rock reservoirs at preset can be effectively solved, a large-range 'network crack' system is achieved, the 'acid etching improvement volume' of fracturing and 'long-term flow guide capacity' after fracturing are improved to the greatest extent, and the fracturing improvement effect and the employing degree of the kind of reservoirs are improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir hydraulic fracturing stimulation, and more specifically relates to an acid fracturing technology suitable for carbonate rock reservoirs. Background technique [0002] Carbonate reservoirs generally have natural fractures and caves with severe heterogeneity, and the fracture-cave system is the main place for oil and gas storage and seepage; The oil and gas seepage channels are mainly fractures. Theory and practice have proved that acid fracturing is the main technological measure for increasing production of carbonate oil and gas reservoirs. Through acid fracturing, the acid liquid dissolves in an uneven manner, and the acid-etched fractures can still maintain a certain length and conductivity when the fractures are closed, communicating and connecting the oil and gas seepage channels and oil storage space, so as to achieve the purpose of increasing production, thereby Ensure normal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27
Inventor 蒋廷学刘建坤周林波王宝峰孙海成卞晓冰吴峙颖
Owner CHINA PETROLEUM & CHEM CORP
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