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Rope-dropping-fishing-free multifunctional downhole throttler

A multi-functional choke technology, applied in the direction of production fluid, wellbore/well parts, wellbore/well valve device, etc., can solve the problem that the choke nozzle cannot be removed, and achieve significant cost reduction and efficiency increase Effect

Inactive Publication Date: 2020-09-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a multifunctional downhole choke without rope fishing, which solves the problem that the choke nozzle cannot be removed in the choke device, and realizes that the choke nozzle can be removed without investing a lot of manpower and material resources

Method used

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  • Rope-dropping-fishing-free multifunctional downhole throttler
  • Rope-dropping-fishing-free multifunctional downhole throttler
  • Rope-dropping-fishing-free multifunctional downhole throttler

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Experimental program
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Effect test

Embodiment 1

[0037] Referring to Figures 1 to 3, it is a schematic structural diagram of Embodiment 1 of the present invention, a multifunctional downhole choke free of rope fishing, which is characterized in that it includes:

[0038] salvage head 1;

[0039] A lock block body 8, the lock block body 8 is detachably connected to the outer peripheral surface of the fishing head 1, and the outer peripheral surface of the lock block body 8 is provided with a lock block hole, and the lock block 7 is slidably connected in the lock block hole. One side of the lock block 7 is in contact with the outer circumferential surface of the fishing head 1;

[0040] A limiting part, the limiting part is detachably connected to the top of the lock block body 8, and the inner peripheral surface of the limiting part is slidably connected with the fishing head;

[0041] Air nozzle seat post 2, the air nozzle seat post 2 is slidably connected to the inner circumferential surface of the fishing head 1;

[0042...

Embodiment 2

[0053] refer to figure 2 , The difference of this embodiment is: a pin 6 is arranged between the lock block body 8 and the fishing head 1 .

[0054] During actual use: the pin-6 can prevent the locking block 7 from being extruded by the large diameter of the fishing head 1 when being lowered due to small resistance, and cannot complete the normal lowering.

Embodiment 3

[0056] refer to Figure 2-3 and Figure 5, the difference of this embodiment is: the trigger surface on the outer peripheral surface of the fishing head 1, the diameter of the trigger surface is larger than the outer diameter of the fishing head, the outer peripheral surface of the trigger surface has an upper placement groove, and the upper placement groove An expandable C ring-5 is provided, and the outer circumferential surface of the expandable C-ring-5 is slidably connected with the lock block body 8, and the inner circumferential surface of the lock block body 8 is provided with an upper limit slot which cooperates with the expandable C-ring-5 51, and the upper limit groove 51 is located on and above the lock block 7.

[0057] In actual use: the lock block 7 is extruded by the large neck of the salvage head 1 and stuck in the slot of the preset working cylinder, and at the same time, the expandable C ring 15 then goes down to the slot 8 of the lock block body and pops o...

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Abstract

The invention relates to the technical field of gas field gas recovery, in particular to a rope-dropping-fishing-free multifunctional downhole throttler. The rope-dropping-fishing-free multifunctionaldownhole throttler comprises a fishing head, a lock block body, a limiting portion and a gas nozzle seat rod. The lock block body is detachably connected to the outer circumference surface of the fishing head, a lock block hole is formed in the outer circumference surface of the lock block body, a lock block is slidingly connected into the lock block hole, and one side of the lock block makes contact with the outer circumference surface of the fishing head. The limiting portion is detachably connected to the top end of the lock block body, and the inner circumference surface of the limiting portion is slidingly connected with the fishing head. The gas nozzle seat rod is slidingly connected to the inner circumference surface of the fishing head. A gas nozzle seat is knocked out through downgoing impact force of a plunger, a large passageway is formed, meanwhile the throttler can be used as a downhole positioner for a plunger drainage gas recovery measure, it is not needed to fish the throttler and trip in the downhole positioner again, and the effect of reducing the cost and increasing benefits is remarkable. A check valve is additionally arranged in the throttler, the situation that liquid slips as the plunger moves downwards during plunger drainage gas recovery is avoided, and the effect of plunger drainage gas recovery is improved.

Description

technical field [0001] The invention relates to the technical field of gas production in gas fields, in particular to a rope-free multifunctional downhole choke. Background technique [0002] In order to reduce pressure, throttle, and limit production in natural gas exploitation, downhole chokes are often installed in gas well shafts. Downhole chokes are divided into slip chokes and preset chokes according to different sealing methods. The slip restrictor is set and anchored at any position in the production string. The pre-set choke is set and anchored in the pre-set mandrel that is connected to the production string and lowered into the well together with the production string. Slip chokes were widely used in the early stage of Sulige gas field development. The preset restrictor has short sealing surface, good sealing reliability and long service life, and once the sealing section is separated from the preset working cylinder, its outer diameter is smaller than the inner...

Claims

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Application Information

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IPC IPC(8): E21B43/12E21B23/00E21B34/06
CPCE21B43/12E21B23/00E21B34/06
Inventor 杨旭东周少丹季伟刘双全肖述琴徐文龙陈勇卫亚明
Owner PETROCHINA CO LTD
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