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

A cable conveying and clustering technology, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of secondary engineering accidents, unfavorable jamming accidents, and pipe stringing, and achieves strong applicability and economical reduction. Loss, the effect of preventing cable curling

Active Publication Date: 2018-07-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A cable-transported cluster perforation operation explosive release method, comprising the following steps:

[0032] a. Connect the fishing head 2, the weight 3, the magnetic locator 4, the conversion joint 5, the electromechanical release device 6, the multi-stage perforating gun string 7 and the bridge plug tool 8 in sequence, and the connected pipe string is connected with the cable 1, go down the well;

[0033] b. If the perforating gun string needs to be discarded during the construction process, an electric signal is sent to the firing block 9 to detonate the detonator 10 and the detonating cord 11 in the electromechanical throwing device 6, so that the weak point on the weak point explosive rod 12 is blown off , the well fluid enters the inner cavity of the electromechanical throwing device 6 through the through hole on the explosion bypass 13, pushes the piston rod 16 to move downward, and recovers the claw end of the throwing claw 15, and the throwing sleeve 18...

Embodiment 2

[0043] Such as figure 2 As shown, the assembly steps of the electromechanical throwing device in the present invention are as follows: 1) Connect one end of the throwing claw 15 to the explosion bypass 13, and the other end to the claw jacket 17; 2) Press one end of the throwing sleeve 18 3) Press the sealed wire column 14 into the piston rod 16, pull out the wires at both ends, and then press into the throwing sleeve 18 until it enters the inner cavity of the claw cover 17; 4) Connect with the first stage The relay sub-joint 19 connected with the perforating gun; 5) connect the selection block 9, the detonator 10 and the detonating cord 11, and then connect with the lead wire at one end of the sealed wire column 14, insert the weak point explosive rod 12, and finally install it as a whole into the side of the explosion Pass 13.

[0044] The specific implementation steps of the explosive release of jamming hands during cable conveying cluster perforating operations: 1) Conne...

Embodiment 3

[0046] The electromechanical device for throwing hands among the present invention comprises weak point explosive rod 12, explosion bypass 13, piston rod 16, insulating sealing plug, bullet claw 15, throwing gloves sleeve 18 and gun string connection joint.

[0047] Design ring-shaped weak points and through holes on the weak point explosive rod 12. The weak point explosive rod 12 has built-in pyrotechnics and wires. The rod 12 is placed inside the explosion bypass 13, and the weak point of the explosion rod 12 has the function of resisting pressure of 105MPa.

[0048] Explosion bypass 13 has 4 through holes in the annular design, and the position of the annular weak point is exactly the same as that of the through holes. One end of the female button is connected to the ignition head; the insulating sealing plug has the function of insulating the movable piston rod 16, and can realize normal power supply and signal transmission. Be installed on movable piston rod 16 upper ends...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B23/04
Inventor 唐凯陈华彬陈锋郭晓燕陈建波任国辉王海东李奔驰周鑫
Owner BC P INC CHINA NAT PETROLEUM CORP
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