A sliding sleeve switch device for segmental fracturing

Abstract

The invention relates to a segmented fracturing device in the field of petroleum machinery, in particular to a segmented fracturing sliding sleeve switch device. Including upper joint, upper connecting sleeve, central tube, upper fixing sleeve, spring, upper inner sliding sleeve, upper sliding support, connecting rod, sliding sleeve switch claw, pin, lower sliding support, lower fixing sleeve, lower inner sliding sleeve , the lower connecting sleeve and the lower joint; the upper end of the upper joint is connected to the oil pipe, the lower end of the upper joint is threadedly connected with the upper end of the upper connecting sleeve, the lower end of the upper connecting sleeve is threaded with the upper end of the upper fixing sleeve, and the right end of the upper fixing sleeve is arranged to slide support. The principle of the invention is to store and release the elastic potential energy of the spring under the action of high-pressure liquid to realize the radial extension and contraction of the sliding sleeve switch claw, and complete the opening and closing of the fracturing sliding sleeve. Beneficial effects: the present invention has the advantages of simple structure, convenient operation, stable and reliable operation, and effectively meets the on-site requirements of multi-stage sliding sleeve open-hole staged fracturing of horizontal wells in various working conditions, and realizes full fracturing development of reservoirs.

Description

technical field [0001] The invention relates to a segmented fracturing device in the field of petroleum machinery, in particular to a segmented fracturing sliding sleeve switch device. Background technique [0002] The multi-stage sliding sleeve open hole staged fracturing technology for horizontal wells is often completed by presetting pipe string construction, one-time running, and continuous ball-dropping operations. It is widely used in directional wells and horizontal wells in shale gas and low-permeability production layers. Fracturing. However, with the popularization and application of this technology, the disadvantage of difficult subsequent reservoir stimulation has also been exposed. Due to the lack of a special device for switching sliding sleeves for segmental fracturing, when oil and gas wells produce water, formation water can easily enter the wellbore through the sliding sleeves. , interfere with the fracturing operation; in addition, for the section with in...

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Problems solved by technology

However, with the popularization and application of this technology, the disadvantage of difficult subsequent reservoir stimulation has also been exposed. Due to the lack of a special device for switching sliding sleeves for segmental fracturing, when oil and gas wells produce water, formation water can easily enter the wellbore through the sliding sleeves. , interfere with the fracturing operation; in addition, for the section with insufficient fracturing, the secondary fracturing cannot be realized through the switch of the sliding sleeve

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