Method for experimentally determining carbonate rock oil and gas reservoir acid fracturing fracture conductivity distribution

A carbonate rock and conductivity technology, applied in chemical instruments and methods, analytical materials, and production fluids, etc., can solve problems such as difficulty in reacting conductivity, affecting acid fracturing effects, and low accuracy

CN106522935AActive Publication Date: 2017-03-22SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-03-22

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Abstract

The invention discloses a method for experimentally determining carbonate rock oil and gas reservoir acid fracturing fracture conductivity distribution. The method comprises the steps that an acid fracturing simulator FracproPT is adopted for simulating the down-hole acid fracturing fracture extending and acid etching process during acid fracturing, and fracture width distribution, fracture height distribution, temperature distribution and acid liquor mass concentration distribution data in the hydraulic fracture length direction are obtained; in the hydraulic fracture length direction, fracture width, fracture height and temperature data of total 10 feature points with the acid liquor mass concentration being 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10% of the initial mass concentration are selected; acid injection displacement of the oil field site scale is converted into acid injection displacement of the laboratory scale; according to the acid liquor mass concentration data of the 10 feature points, acid liquor used for an experiment is prepared; and the acid etching process is simulated, the conductivity under the condition of reservoir closed pressure is tested experimentally, and a distribution diagram of the acid etching fracture conductivity in the fracture length direction under the reservoir condition is drawn. The method is reliable in principle and simple and convenient to operate and has wide market prospects.
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Description

technical field

[0001] The invention relates to a method for experimentally determining the distribution of conductivity of acid fracturing fractures in carbonate oil and gas reservoirs in the field of petroleum engineering. Through experiments, the distribution of conductivity of underground acid fracturing fractures along the direction of fracture length is tested to accurately evaluate the conductivity of underground acid fracturing fractures. ability to improve the stimulation effect of acid fracturing in carbonate oil and gas reservoirs. Background technique

[0002] my country's marine carbonate reservoirs are widely distributed, with 50 marine basins and an exploration area of ​​about 455×10 4 km 2 , the amount of oil and gas resources is 380×10 8 t oil equivalent. In recent years, large-medium-sized marine carbonate oil and gas fields have been successively discovered in the Sichuan Basin, the Ordos Basin, and the Tarim Basin. By the end of the "Eleventh Five-Year...

Examples

Embodiment Construction

[0058] The present invention will be further described below in conjunction with the accompanying drawings and application examples, for the purpose of schematically illustrating and explaining the present invention, and not limiting the scope of the present invention. details as follows:

[0059] (1) Use the commonly used acid fracturing simulator FracproPT to simulate the extension and expansion of downhole acid fracturing fractures and acid etching process in the process of acid fracturing, and obtain the distribution of fracture width, fracture height, temperature and acid quality along the hydraulic fracture length direction Concentration distribution data; in the length direction of hydraulic fractures, the mass concentration of acid liquid is selected as 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, and 10% of the initial mass concentration. The seam width, seam height and temperature data of 10 feature points.

[0060] 1) Import the wellbore data, reservoir geological...