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Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs

A technology for carbonate rocks and oil and gas reservoirs, which is applied in the direction of earth drilling, production fluid, wellbore/well components, etc., and can solve problems such as high cost, high engineering risk, and time-consuming

Inactive Publication Date: 2015-11-11
CHINA UNIV OF PETROLEUM (BEIJING) +3
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Problems solved by technology

When the stress orientation, natural fracture orientation and reservoir orientation are poorly matched, the acid fracturing fractures are controlled by the stress and natural fracture development, and the acid fracturing cannot communicate with the fracture-cavity system. The conventional method is to open windows and sidetrack. For carbonate gas reservoirs with a size of more than 10000 meters, the sidetracking project of window opening is risky, time-consuming and expensive

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  • Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs
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  • Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs

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Embodiment 1

[0069] This implementation provides a method for acid fracturing of fractures in carbonate oil and gas reservoirs. The method uses material liquid to perform acid fracturing in a well A in the Halahatang Oilfield in the Tarim Basin.

[0070] 1. Introduction of well conditions: Limestone reservoirs in Tarim Oilfield are widely distributed, accounting for about 40% of Tarim reserves. The reservoirs are buried deep (5000-7400 meters), with high closure pressure (greater than 80 MPa) and high temperature (120 -170°C), with strong heterogeneity, low matrix permeability (less than 0.1 mD), average porosity around 1%, and good reservoirs are all developed with large natural fractures and caves. When the orientation of the maximum principal stress is not conducive to the communication between fractured and caved bodies, the effect of conventional acid fracturing is unsatisfactory. Therefore, it is necessary to use fracture steering technology to realize multi-fracture reconstruction. ...

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Abstract

The invention provides a fractural diverting acid-fracturing method for carbonate oil-gas reservoirs. The method includes the steps of 1, injecting 50-5000 cubic meters of fracturing fluid into a stratum at a displacement speed of 2.0-15.0 m<3> / min; 2, injecting 5-100 cubic meters of material fluid into the stratum at a displacement speed of 1.0-15.0 m<3> / min, and allowing pumping at a displacement speed of 0.5-4.0 m<3> / min after the material fluid enters a preset intra-fracture bridge plug; 3, injecting 50-500 cubic meters of fracturing fluid into the stratum at a displacement speed of 3.0-15.0 m<3> / min to allow forced fractural diverting; 4, injecting 20-300 cubic meters of acid fluid at a speed of 2.0-15.0 m<3> / min to allow modification by acid etching; performing at least one operation of steps from 2 to 4. The method has the advantages that multiple diverted acid-fracturing fractures can be formed after repeated multiple of temporary plugging and fracture forming, temporary plugging material degrades after acid-fracturing construction is complete, low pollution is caused to reservoirs, and the method helps improve acid-fracturing efficiency.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and in particular relates to a fracture diverting acid fracturing method of a carbonate rock oil and gas reservoir. Background technique [0002] Carbonate oil and gas reservoirs are widely distributed in my country. Carbonate reservoirs generally have natural fractures and caves, strong heterogeneity, and poor matrix physical properties. Since the current geophysical prospecting methods cannot accurately determine the specific locations of fractures and caves, drilling It is impossible to ensure that natural fractures and karst cave systems are directly put into production, and the natural production rate is low, and most of them need reservoir reconstruction before they can be put into production. [0003] For fracture-cavity reservoirs, the main purpose of acid fracturing is to connect fractures and caves. Only when acid fracturing fractures communicate with the f...

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Application Information

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IPC IPC(8): E21B43/27E21B43/26E21B33/13
Inventor 周福建刘雄飞张福祥赵海洋耿宇迪石阳杨贤友黄世财刘辉张雪松李秀辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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