A test method for unpacking ability of k344 packer under repeated stimulation conditions of horizontal wells

Abstract

The present invention discloses a device and a method for a releasing capability test of a K344 packer under a condition of repeat reconstruction of a horizontal well. The test device comprises a plugwith a pull ring, a test oil tube, an oil tube striking hole, a simulation sleeve, a first plug, a spacing ring, a piston, an annular striking hole, an orifice, a K344 packer, an explosion liquid exit channel and a second plug. The plug with the pull ring is connected with the test oil tube, and the oil tube striking hole, the orifice and the explosion liquid exit channel are arranged on the testoil tube; the spacing ring is arranged at the inner side of the simulation sleeve; the first plug is provided with an oil tube fixing device and fitting screws; and the piston can transversely move,and contact surfaces of an inner wall and an outer wall are sealed by employing seal rings. The test method provided by the invention can simulate a releasing capability of the K344 packer when upperand lower ends of a rubber sheet of the K344 packer have a large differential pressure after repeat reconstruction of a horizontal well, the test device is simple in structure and low in cost, and a test result is reliable.

Description

technical field [0001] The invention relates to a device and method for testing the unsealing ability of a K344 packer under repeated reconstruction conditions of horizontal wells, which can complete the unsealing under the condition that there is a large pressure difference between the upper and lower ends of the expandable packer rubber Performance testing provides guidance for the selection of packers for repeated stimulation of horizontal wells. Background technique [0002] For the process technology of using packer to seal the target section for repeated stimulation of horizontal wells, the packer usually isolates the oil casing annulus into three or more areas. Two different pressure systems can be formed in the vicinity of the packer: one end of the fracturing section is a high-pressure area, and the other end is a low-pressure area due to the lack of formation energy, so there is a large pressure difference between the two ends of the packer. Whether the packer can...

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Problems solved by technology

[0003] At present, conventional packer performance tests mainly focus on pressure bearing and sealing performance tests, strength tests, etc. Some of the test devices that have been disclosed can simulate the deformation of the rubber under the condition of upper and lower pressure differences, but they have not yet aimed at this working condition. Specific test device and method for unsealing test of expandable packer under certain conditions

The disadvantages of conventional test devices and methods are: complex structure and high cost; mainly for testing pressure bearing and sealing performance tests and strength tests, without testing the unsealing ability of the upper and lower ends of the rubber under high pressure differential conditions, repeated reconstruction for horizontal wells The fracturing string was unsealed and tripped smoothly, leaving hidden dangers, which could not meet the packer test requirements for repeated reconstruction of horizontal wells

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