Method for fracture pre-support and leak resisting and plugging while drilling of fractured reservoir

Abstract

The invention relates to the field of fractured reservoir working fluid loss control and reservoir protection in the field of petroleum and natural gas and provides a method for fracture pre-support and leak resisting and plugging while drilling of a fractured reservoir. In order to overcome the defect that leak resisting and plugging materials of the fractured reservoir cannot give considerationboth to plugging a fracture and keeping the flow capacity of the natural fracture, a harmful solid phase detained in the fracture in the leak resisting and plugging process is converted into a usefulsolid phase which supports the fracture and keeps the flow capacity of the natural fracture, so that the purposes of achieving leak resisting and plugging and keeping the flow capacity of the naturalfracture are achieved. By means of laboratory experiments, considering the compression strength and corrosion ratio of the leak plugging material, a high-strength inertia support material type and a soluble filling material type are preferable; considering the plugging pressure bearing capacity and the permeability restoration of the supported fracture, material concentration matching is optimized; in on-site operation, early-period feeding and later-period supplementing of the leak resisting and plugging material are reasonably controlled. In this way, the purpose of give consideration to both plugging the fracture and keeping the flow capacity of the natural fracture is achieved. The new leak resisting and plugging method has important significance in efficient exploitation of fracturedoil and gas reservoir.

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 natural fracture conductivity, so as to achieve both leakage prevention and plugging while maintaining the natural fracture conductivity. It is of great significance to the efficient development of fractured oil and gas reservoirs. The invention belongs to a method for controlling the leakage of working fluid aimed at the protection of fractured oil and gas reservoirs during the exploration and development of oil and natural gas. Background technique [0002] Reservoir protection is a key technology and an important research field throughout the whole process of exp...

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Problems solved by technology

[0005] In order to solve the problem that it is difficult to balance the plugging of fractures and the maintenance of fracture conductivity during the plugging process of existing fractured oil and gas reservoirs, the present invention proposes a method for preventing and plugging leaks while drilling pre-supported fractures in fractured oil and gas reservoirs. Taking fracture plugging as a means and aiming at maintaining the natural fracture conductivity, the purpose of pre-supporting fracture plugging is achieved by adding high-strength inert support materials and soluble filling materials into the drilling fluid

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