High-efficiency fracturing combined device for multi-stage horizontal well

Abstract

The invention relates to a special underground tool for conventional oil gas, shale gas and coal bed gas, in particular to a high-efficiency fracturing combined device for a multi-stage horizontal well. The high-efficiency fracturing combined device comprises an open hole packer, a high-efficiency fracturing sliding bush, a small open hole packer, a ball fracturing sliding bush and the like; the first section is provided with a conventional fracturing device; and the second section is provided with the high-efficiency fracturing combined device which has the same structure as high-efficiency fracturing combined devices from the third section to the sixteenth section. An upper joint of the high-efficiency fracturing sliding bush is in threaded connection with a front connecting sliding bush; the lower end of the front connecting sliding bush is connected with the upper end of a middle connecting sliding bush; the lower end of the middle connecting sliding bush is connected with a back connecting sliding bush; the lower end of the back connecting sliding bush is screwed with a lower joint through threads; an upper step of a front baffle is matched with a lower step of the front connecting sliding bush; the lower end of the front baffle is contacted with the lower end of a back baffle; and the lower end of the back baffle is contacted with the upper end of a C-shaped ball seat. The high-efficiency fracturing combined device has high sealing property and high fracturing well completion efficiency, can realize multi-stage fracturing, and improves the technical level and economic benefit of a fracturing technology.

Description

technical field [0001] The invention relates to a special downhole tool for conventional oil and gas, shale gas and coal bed methane, and is a high-efficiency fracturing combined device for multi-stage horizontal wells. Background technique [0002] With the deepening of exploration and development of oil and natural gas resources at home and abroad, oil and gas are easy to be extracted from conventional shallow wells, and the focus of exploration and development is gradually shifting to shale oil, shale gas, tight oil and gas, etc., which are widely distributed and have great potential. For oil and gas resources, the use of horizontal wells plus multi-stage fracturing technology will be one of the main technologies for high-efficiency and low-cost exploitation of new energy sources such as shale oil and gas, tight oil and gas, and coalbed methane, and to enhance recovery. [0003] At present, the horizontal well fracturing used at home and abroad is mainly the traditional l...

AI Technical Summary

Problems solved by technology

[0003] At present, the horizontal well fracturing used at home and abroad is mainly the traditional lower bridge plug perforation technology, while the single-stage fracturing technology of step-by-step pitching can only achieve a certain degree of fracturing in specific intervals, which has great impact on reservoir structure and pitching. The quantity is limited to a certain extent, and the pertinence and effectiveness of reservoir stimulation are not enough, especially for the contact area of ​​open hole reservoir in long horizontal section and the seepage area after fracturing is not sufficient, the stimulation effect and reservoir Potential cannot be used effectively

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