Cable transmission clustering perforation operation explosion jam release method

Abstract

The invention discloses a cable transmission clustering perforation operation explosion jam release method, comprising the following steps: a, connecting a fishing spear, an added weight, a magnetic locator, a crossover coupling, an electromechanical release device, a multi-level perforation gun string and a bridge plug tool in sequence, connecting a pipe string with a cable, and descending the pipe string in a well; b, if blockage occurs in a construction process, releasing the perforation gun string, sending an electric signal to an ignition selection block, and detonating a detonator and a detonating fuse in the electromechanical release device, so that a weak point on a weak point exploding rod is broken by exploding and well liquid enters an inner cavity of the electromechanical release device by a through hole in an exploding bypass,; pushing a piston to move downward, and withdrawing a claw end of an out-of-hand elastic claw, so that a release sleeve is released together with the perforation gun string under the action of the self gravity of the pipe string or the tensile force of the external cable, and jam release is realized. The weak point tensile force of the cable can be increased, the weight of the cable and a tool string in the well is enabled ensured not to be less than wellhead pressure load in case of jam lease, and the safety of the cable is ensured.

Description

technical field [0001] The invention relates to a cable-transported clustered perforation operation explosive jam release method, which belongs to the technical field of conventional and unconventional oil and gas well development. Background technique [0002] Clustered perforation technology has been widely used in the exploration and development of unconventional oil and gas reservoirs. This technology requires wellhead pressure operation, and the weight of the running string needs to be increased during operation to ensure that the string can run in the vertical well section by its own weight. run. [0003] During the operation of vertical wells and horizontal wells with complex well conditions, on the one hand, the casing of vertical wells is deformed, or the formation of sand, chemical sediment precipitation, wellbore deformation, and irregular wellbore trajectory, etc. Reasons, on the other hand, when the cable is set to seal the bridge plug, the weak point is not ou...

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Problems solved by technology

[0003] During the operation of vertical wells and horizontal wells with complex well conditions, on the one hand, the casing of vertical wells is deformed, or the formation of sand, chemical sediment precipitation, wellbore deformation, and irregular wellbore trajectory, etc. Reasons, on the other hand, when the cable is set to seal the bridge plug, the weak point is not out of hand and other factors. During the operation, the pipe string is often stuck, and the pipe string cannot be lifted out of the well. It is necessary to apply a tensile load to the cable through the ground winch to remove the cable from the setting However, due to the pressure at the wellhead, once the weight of the cable is out of balance with the pressure load at the wellhead, the cable will quickly spit out under the action of the wellhead pressure, causing the cable to curl and be scrapped, or even a secondary engineering accident

In addition, in the perforating operation, the tension of the weak point of the cable is smaller than that of the cable itself, which is not conducive to dealing with downhole stuck accidents

[0004] Although the prior art discloses some hands-off devices, such as Chinese Patent Publication No. 204252892U discloses a cable transmission perforating electromechanical hands-free device, the disclosure date is 2015-04-08, and Chinese Patent Publication No. 204252891U discloses a Electromechanical hands-off release device, the release date is 2015-04-08, but the above problems are still not resolved

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