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Wellhead Blowout Prevention Device for Pumping Wells and Blowout Prevention Method When Opening Wellhead Operation

A technology for pumping wells and blowout prevention devices, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc. It can solve the problems of affecting operation safety, cumbersome installation and use, and high cost, so as to ensure safety and operation The effect of convenience and simple installation

Active Publication Date: 2019-07-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the increasingly complex physical properties of crude oil, heavy oil and foreign matter (wax, asphaltene, oil sludge, oil sand) often appear to block the wellbore and even cause the pumping unit to get stuck
In order to improve the success rate of unblocking and unblocking, it is usually necessary to lift the rod pump up, pull it away from the positioning and short-circuit it for positive squeeze unblocking; or lift up the plunger of the tubular pump and pull it away from the pump barrel to backwash and unblock , in order to realize the above operations, the polished rod and the supporting double rubber gate and high-pressure sealer need to be removed on site, and 2 to 3 sucker rods must be removed at the same time. At present, during the on-site replacement operation, the wellhead has been in the empty state for a long time, which seriously affects the job safety
[0003] An existing wellhead blowout prevention device is composed of valve body, valve seat, check valve and other components, which can solve the problem of blowout prevention to a certain extent, but its structure is complicated, the cost is high, and the installation and use are relatively cumbersome

Method used

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  • Wellhead Blowout Prevention Device for Pumping Wells and Blowout Prevention Method When Opening Wellhead Operation
  • Wellhead Blowout Prevention Device for Pumping Wells and Blowout Prevention Method When Opening Wellhead Operation
  • Wellhead Blowout Prevention Device for Pumping Wells and Blowout Prevention Method When Opening Wellhead Operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 Shown is a cross-sectional view of Embodiment 1 of the blowout prevention device at the wellhead of the pumping well of the present invention; this embodiment provides a blowout prevention device at the wellhead of the pumping unit, including a blowout prevention nipple 1, and the top of the blowout prevention nipple 1 is detachable The blowout prevention plug 2 is provided; the bottom end of the blowout prevention nipple 1 is provided with a first joint for detachably connecting with the upper end of the oil tree 3, and the inner cavity of the blowout prevention nipple 1 is connected with the sucker rod 4 in the oil tree 3 To match, there is a sucker rod hanger 5 inside the blowout prevention nipple 1, and a step 6 is set on the inner wall of the blowout prevention nipple 1 at the first distance from the bottom, and the sucker rod hanger 5 is supported on the step 6, the bottom end of the sucker rod hanger 5 is formed with a plug that can be inserted i...

Embodiment 2

[0047] In this embodiment, when the polished rod is replaced with the wellhead, the pumping unit wellhead blowout prevention device provided in the previous embodiment is used to implement blowout prevention at the wellhead:

[0048] When starting the wellhead operation to replace the oil pumping rod, the specific operation steps include:

[0049] S101: Remove the accessories installed on the oil sucking rod, and remove the oil sucking rod from the top of the sucking rod;

[0050] The specific operation steps of S101 can be as follows: open the wellhead, use the lifting device 9 to lift the oil rod, put out the first oil pump sub-rod coupling, put an elevator on the coupling, and remove the pumping rod above the first coupling. The accessories on the polished oil rod and the polished oil rod, wherein the accessories on the polished oil rod include rubber gates and high-pressure sealers.

[0051] S102: Sleeve the blowout prevention nipple 1 of the wellhead blowout prevention d...

Embodiment 3

[0058] When the wellhead operation is started, the rod pump is squeezing and unblocking, well washing, water injection and oil replacement or the tube pump is washing the well, water injection and oil replacement, figure 2 It is a schematic diagram of the state of the wellbore before unblocking in Embodiment 2 of the blowout prevention method when the pumping well is opened for wellhead operation of the present invention; image 3 It is a schematic diagram of the state of the wellbore when unblocking the blowout prevention method embodiment 2 of the pumping well of the present invention when the wellhead operation is opened; in the figure, the oil well pump 7 can be a rod pump, and can refer to Figure 2-3 ,Specific steps are as follows:

[0059] S201: Remove the accessories installed on the oil sucking rod, and remove the oil sucking rod from the top of the sucking rod;

[0060] The specific operation of S201 can be to open the wellhead, use the lifting device 9 to lift the...

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PUM

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Abstract

The invention provides a wellhead blowout prevention device of a rod-pumped well and a blowout prevention method used during wellhead opening operation. The wellhead blowout prevention device of the rod-pumped well comprises a blowout prevention short section. A blowout prevention screwed plug is detachably arranged at the top end of the blowout prevention short section. A first connector detachably connected with the upper end of a Christmas tree is arranged at the bottom end of the blowout prevention short section. An inner cavity of the blowout prevention short section is matched with a sucker rod inside the Christmas tree. A sucker rod hanger is arranged in the blowout prevention short section. A step is arranged on the inner wall of the blowout prevention short section and separated from the bottom end by a first distance. The sucker rod hanger is supported on the step. A plug which can be inserted into the sucker rod and connected with the sucker rod is formed at the bottom end of the sucker rod hanger. By means of the wellhead blowout prevention device of the rod-pumped well and the blowout prevention method used during wellhead opening operation provided by the invention, the effect that when a wellhead needs to be opened for operations of replacement of the sucker rod, plug removal with forward extrusion, well washing and the like, occurrence of a blowout accident is prevented, and the purpose of blowout prevention is achieved is guaranteed. The wellhead blowout prevention device of the rod-pumped well is simple, convenient to operate and safe in operation.

Description

technical field [0001] The invention relates to an oil field blowout prevention technology, in particular to a wellhead blowout prevention device for a pumping well and a blowout prevention method when the wellhead is opened for operation. Background technique [0002] With the continuous development of the oil field, the energy of the formation is gradually insufficient, and the development method is gradually changed from the self-flowing well to the pumping well, and the polished rods, double rubber gates and high-pressure sealers of the pumping wells are prone to fatigue and corrosion after long-term operation, so they must be inspected regularly , or even replace. In addition, due to the increasingly complex physical properties of crude oil, heavy oil and foreign matter (wax, asphaltene, oil sludge, oil sand) often appear to block the wellbore and even cause the pumping unit to get stuck. In order to improve the success rate of unblocking and unblocking, it is usually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/06
Inventor 杨晓东谭柱成福田杨其展徐文涛杨文明王应全佘姣凤冯蓓华巩文林王林强张家成贾海民曹宏罗慎超王霞张琪
Owner PETROCHINA CO LTD