The method of releasing the card and losing hand in the explosion of the cable conveying cluster perforation operation

Abstract

The invention discloses a method for explosively unblocking and throwing hands in clustered perforating operations carried by cables, comprising the following steps: a. Connecting salvage spears, weights, magnetic locators, conversion joints, electromechanical throwing devices, and multi-stage perforating guns in sequence The string and bridge plug tool, the pipe string is connected with the cable, and goes down the well; b. If the perforating gun string is stuck during the construction process, the perforating gun string should be discarded, and an electrical signal will be sent to the selection block to detonate the detonator and detonating cord in the electromechanical throwing device , so that the weak point on the weak point explosion rod is blown off, the well fluid enters the inner cavity of the electromechanical throwing device through the through hole on the explosion bypass, pushes the piston rod to move downward, the claw end of the throwing claw is recovered, and the throwing sleeve together with the shooting The hole gun string is released under the action of the pipe string's own gravity or the pulling force of the external cable, so as to realize the release of the card and throw away the hand. The invention can increase the pulling force of the weak point of the cable, and can ensure that the weight of the cable processing tool string in the well is not less than the pressure load of the wellhead when the jam is released and the hand is released, so as to ensure the safety of the cable.

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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