Fractured reservoir pre-supporting crack leaking stoppage material selection method

Abstract

The invention relates to the fields of fractured reservoir working liquid loss control and reservoir protection in the oil and natural gas industries. Aiming at the defects that in the fractured reservoir loss control process, the purposes of blocking cracks and maintaining the flow guiding capability of natural cracks are difficult to be taken into account concurrently by a leaking stoppage material, a harmless solid phase detained in the cracks in the leaking stoppage process is converted into a useful solid phase with the effects of supporting the cracks and maintaining the flow guiding capability of the natural cracks according to the contradiction transformation idea, and then the purposes of preventing and blocking leakage and maintaining the flow guiding capability of the natural cracks are achieved. Through indoor experiments, the types of a high-strength inert supporting material and a soluble filling material are selected by taking the compressive strength and the solution ratio of the leaking stoppage material into account, and material concentration matching is optimized by taking the blocking pressure bearing capability and the supporting crack permeability recovery rate into account. Therefore, the purposes of blocking the cracks in the leaking stoppage process and supporting the cracks and maintaining the flow guiding capability of the natural cracks in the production process are achieved. The invention provides a novel leaking stoppage material selection method, and the novel leaking stoppage material selection method has the important significance on efficient development of fractured reservoirs.

Description

technical field [0001] The invention relates to the fields of working fluid leakage control and reservoir protection in the exploration and development process of fractured oil and gas reservoirs in the oil and natural gas industry. This method transforms the harmful solid phase retained in the fracture during the leakage and plugging process into a useful solid phase that supports the fracture and maintains the conductivity of the natural fracture, so as to achieve the purpose of not only controlling the leakage, but also maintaining the conductivity of the natural fracture. It is of great significance to the efficient development of fractured oil and gas reservoirs. The invention belongs to a method for selecting working fluid leakage control materials for the protection of fractured oil and gas reservoirs in the process of oil and natural gas exploration and development. Background technique [0002] Reservoir protection is a key technology and an important research fiel...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that it is difficult to simultaneously plug fractures, control leakage, maintain fracture conductivity, and protect reservoirs in the process of plugging existing fractured oil and gas reservoirs, the present invention proposes a pre-braced fracture plugging for fractured reservoirs Material selection method, which uses plugging of fractures as a means to maintain the natural fracture conductivity as the goal, and achieves the purpose of plugging pre-supported fractures by adding high-strength inert support materials and soluble filling materials into the drilling fluid

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