The controllable dissolution opening device of the first fracturing channel and the construction technology of fracturing in stages

Abstract

The invention relates to a controllable dissolution opening device for the first stage of fracturing channel and construction technology of fracturing segmental operation. The opening device includes a body, a soluble plug, and a cementing plug; the upper end of the body is provided with a casing box thread, the lower end is provided with a casing pin thread, and the outer surface of the body is provided with a righting edge; the body is connected in the casing string through the casing box thread and the casing pin thread, and the A fracturing hole is arranged inside the centralizing rib, and the soluble plug is installed in the fracturing hole; the cementing plug is arranged in the cavity below the body, and is in contact with the cementing floating hoop; A solvent chamber and a rupture disk are arranged in the well rubber plug; the solvent chamber is filled with a solution capable of dissolving soluble embolism. The invention can realize the opening of the first fracturing channel, has simple construction procedures, low construction cost, unlimited running depth, and does not affect casing running, well cementing, casing sealing pressure testing and other constructions 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...

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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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