Volume fracturing method for crack net of carbonate reservoir
A carbonate rock reservoir and volume fracturing technology, which is applied in the development of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of poor volume fracturing stimulation effect and less formation of secondary fractures, etc. Achieve the effect of improving the transformation effect, increasing the effectiveness, and reducing the liquid filtration loss
Active Publication Date: 2019-02-01
中石化石油工程技术服务有限公司 +1
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[0005] The purpose of the present invention is to provide a fracture network volume fracturing method for carbonate rock reservoirs, so as to solve the problems in the existing methods that the formation of secondary fractures is small and the effect of volume fracturing is poor
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[0029] The embodiments of the present invention will be further described below in conjunction with specific examples. The injected liquid in the examples will be briefly described below. The percentages of each component in the injected liquid are percentages by weight.
[0030] Slippery water, composed of 0.06% drag reducing agent, 0.3% anti-swelling agent, 0.1% drainage aid and the rest of water, has low viscosity characteristics.
[0031] The slug is composed of slick water and 70 / 140 mesh powder pottery, and the mass proportion of powder pottery is 2-3%.
[0032] The pre-acid consists of 25% HCl, 1.5% corrosion inhibitor, 0.15% iron ion stabilizer, 1.0% drainage aid, 0.5% foaming agent and the balance of water.
[0033] Gelling acid consists of 25% HCl, 1.5% corrosion inhibitor, 0.15% iron ion stabilizer, 1.0% drainage aid, 0.5% foaming agent, 0.5% thickener and the balance of water.
[0034] The sand-carrying liquid is composed of 0.3% thickener, 0.3% anti-swelling ag...
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The invention relates to a volume fracturing method for a crack net of a carbonate reservoir. The volume fracturing method comprises the following steps that (1) initial crack initiation is conducted,specifically, slickwater is injected into a pretreated formation for crack making, then gel acid is injected for conducting acid etching transformation on cracks, and the crack length is increased; (2) temporary blocking in the cracks is conducted, specifically, microcracks formed by acid etching formation are temporarily blocked through temporary blocking agents carried by the slickwater; (3) turning for acid fracturing is conducted, specifically, gel acid is injected into the temporarily-blocked formation, and after the temporary blocking agents are displaced in place by the gel acid, the gel acid turns to other parts for acid etching transformation; (4) crack making through slickwater is conducted, specifically, slickwater is injected into the formation subjected to acid etching transformation in the step (3) for crack making; and (5) crack-expansion supporting is conducted, specifically, sand-carrying fluid is injected into the formation subjected to crack making in the step (4) for supporting. According to the volume fracturing method for the crack net of the carbonate reservoir, liquid leak-off can be effectively reduced, the effect of 'near-control and far-expansion' is achieved, the abundant secondary cracks can be formed, connectivity with main cracks and natural cracks is improved, and thus the transformation effect of volume fracturing is improved.
Description
technical field [0001] The invention belongs to the field of volume fracturing reconstruction of shale gas reservoirs, and in particular relates to a fracture network volume fracturing method of carbonate rock reservoirs. Background technique [0002] Shale gas reservoirs are characterized by low porosity, low permeability, and various gas occurrence states. Generally, hydraulic fracturing measures are required to obtain economical and effective development. Volume fracturing is a comprehensive transformation of the reservoir in the three-dimensional directions of length, width, and height, so as to increase the seepage area and conductivity of the reservoir. [0003] The Chinese patent with the notification number CN105275446B discloses a volumetric fracturing stimulation method, which includes: injecting low-viscosity fracturing fluid, so that the micro-fractures in the formation near the wellbore are saturated by the low-viscosity fracturing fluid that is leaked out, and ...
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IPC IPC(8): E21B43/27E21B43/267E21B43/26
CPCE21B43/26E21B43/267
Inventor 张兴权杨文波崔红丹王群来常云超晁伟栋郭立新贾永江孙香梅
Owner 中石化石油工程技术服务有限公司
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