Controllable dissolution opening device for first section fracturing channel and fracturing sectional operation construction process

Abstract

The invention relates to a controllable dissolution opening device for a first section fracturing channel and a fracturing sectional operation construction process. The controllable dissolution opening device includes a body, a soluble plug and a well cementing rubber plug; a casing pipe female thread screw thread is arranged at the upper end of the body, a casing pipe male thread screw thread isarranged at the lower end of the body, and a centralizing edge is arranged on the outer surface of the body. The body is connected in to a casing pipe string through the casing pipe female thread screw thread and the casing pipe male thread screw thread, the centralizing edge is internally provided with a fracturing hole, and the soluble plug is installed in the fracturing hole; the well cementingrubber plug is arranged in a cavity below the body, and is in contact with a well cementing float collar, and the well cementing rubber plug is internally provided with a solvent cavity and a rupturedisk; and the solvent cavity is filled with a solution capable of dissolving the soluble plug. According to the controllable dissolution opening device, the first section fracturing channel can be opened, the construction process is simple, the construction cost is low, the running depth is not limited, and the construction of casing pipe running, well cementing and casing pipe sealing pressure tests and the like cannot be affected at all.

Description

technical field [0001] The invention relates to the technical field of staged fracturing for completion of oil and gas wells, and more specifically relates to a controllable dissolution opening device for a first-stage fracturing channel and a construction process for staged fracturing operations. Background technique [0002] Staged fracturing is a drilling and production engineering technology widely used at home and abroad to transform low-permeability unconventional oil and gas reservoirs and realize effective oil and gas recovery. When applying the above-mentioned engineering technology in directional wells such as horizontal wells and high-inclination wells, most of them use the technical method of pumping segmented bridge plugs and perforating guns for perforation. Perforation, the first section of fracturing channel that communicates the inside of the casing and the formation, provides the necessary environmental conditions for pumping the segmented bridge plug. How...

AI Technical Summary

Problems solved by technology

However, this method of providing the first fracturing channel needs to be equipped with coiled tubing equipment and gunpowder perforating equipment. The construction cost is high, the process is complicated, and the operation cost and risk are not low.

In addition, in extended-reach deviated wells or horizontal wells with long horizontal sections, due to the complex trajectory of the wellbore and the long horizontal section, the friction of coiled tubing running is high, and it is difficult to reach the toe of the wellbore for perforation operations.

In a small number of areas in China, the differential pressure sliding sleeve is used to open the first fracturing channel with the casing running, but the outer diameter of the differential pressure sliding sleeve device is large, which increases the difficulty of casing running, and it is possible to Accidental opening during the tightness pressure test, or failure to open normally due to the influence of cement

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