CN210483620U - Cable-passing wellhead blowout preventer - Google Patents

Cable-passing wellhead blowout preventer Download PDF

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Publication number
CN210483620U
CN210483620U CN201921038507.0U CN201921038507U CN210483620U CN 210483620 U CN210483620 U CN 210483620U CN 201921038507 U CN201921038507 U CN 201921038507U CN 210483620 U CN210483620 U CN 210483620U
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CN
China
Prior art keywords
cable
blowout prevention
wellhead
prevention box
gasket
Prior art date
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Active
Application number
CN201921038507.0U
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Chinese (zh)
Inventor
张洪亮
刘镇领
王宏峰
张雪芹
文宏武
卢献玮
贾明辉
李建青
张帅华
朱彤
薛锦善
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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CNPC Bohai Drilling Engineering Co Ltd
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Priority to CN201921038507.0U priority Critical patent/CN210483620U/en
Application granted granted Critical
Publication of CN210483620U publication Critical patent/CN210483620U/en
Active legal-status Critical Current
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Abstract

The utility model discloses a cable-passing wellhead blowout preventer, which comprises a blowout preventer box, a gasket, a plurality of rubber rings and a cable pressure cap, wherein the blowout preventer box is of a pipe body structure, and the lower end of the blowout preventer box is arranged on a wellhead; the gasket is limited on a step on the inner wall of the blowout prevention box, and a bayonet is formed on the gasket so as to be clamped on the cable conveniently; the rubber rings are arranged in the blowout prevention box, are sequentially stacked on the gasket and are compressed by the cable pressing cap. The utility model discloses small, light in weight, simple process, operation are swift, the installation of being convenient for, the practicality is strong, and application scope is extensive, and manufacturing cost and construction cost are low, the facilitate promotion, and application prospect is extensive.

Description

Cable-passing wellhead blowout preventer
Technical Field
The utility model belongs to the technical field of oil gas well test technique and specifically relates to a cable formula well head blowout preventer passes.
Background
The cable test of oil and gas well is the important work of oil and gas field development. For new oil extraction processes such as AICD automatic water control layered oil extraction, DFT downhole fluid automatic identification layered oil extraction, downhole electric control intelligent separated oil extraction, non-flowing well liquid production profile test and the like which are implemented in oil field research at home and abroad, the layered output effect test after automatic water control measures are adopted or the liquid production profile test is particularly important. By adopting the CDT non-flowing well drainage test process, the evaluation of the liquid production effect and the test of the liquid production profile in the underground drainage process can be realized. The CDT non-flowing well drainage test adopts the oil pipe to drive a special underground test hollow pump into a preset well depth, and a setting packer seals the annular space of an oil sleeve. And a logging cable and an underground logging instrument are put into the oil pipe, penetrate through the oil pipe and the underground hollow pump and reach the upper part of the separate production valve or the upper part of a production layer. Power fluid is injected through the annular space, formation drainage is achieved, and the downhole instrument is driven through the cable to conduct layered liquid production profile testing. When the injected power fluid and formation fluid are produced from the oil pipe, pressure exists in a wellhead, and for safety testing and environment-friendly testing construction, a downhole testing instrument crossing wellhead blowout preventer needs to be installed on the wellhead. The conventional wellhead cable blowout preventer has the disadvantages of long-term connection on a cable, large volume, heavy weight, and difficult and complicated construction and installation. If other operations which do not need blowout prevention cables are needed, the cables need to be cut off and the cable caps need to be disassembled. When the cable is installed each time, the cable is cut off, the rope cap is disassembled, the choke tube is penetrated, and the faucet is riveted, so that the process is very complicated. Furthermore, conventional wellhead wireline blowout preventers must be installed on the wireline in advance, requiring flowing fluids to effect wellhead sealing and wireline lubrication. In the non-flowing well liquid discharge test process, no fluid exists in the well mouth when the cable is pulled out of the instrument, if the traditional blowout preventer is adopted, the cable is pulled out of the instrument and is in a dry grinding state, the cable can seriously abrade the wellhead blowout preventer, and the blowout preventer greatly abrades and damages the cable.
Disclosure of Invention
An object of the utility model is to solve above-mentioned technical problem and provide a cable formula well head blowout preventer that installs conveniently and the practicality is strong.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a cable-passing wellhead blowout preventer comprises a blowout preventer box, gaskets, a plurality of rubber rings and a cable pressure cap, wherein the blowout preventer box is of a pipe body structure, and the lower end of the blowout preventer box is installed on a wellhead; the gasket is limited on a step on the inner wall of the blowout prevention box, and a bayonet is formed on the gasket so as to be clamped on the cable conveniently; the rubber ring is arranged in the blowout prevention box, stacked on the gasket in sequence and compressed tightly by the cable pressing cap, wherein each rubber ring is vertically penetrated in the middle to form a center hole for a cable to pass through, a notch is formed in the side end of each center hole in the radial direction to enable the cable to enter the center hole smoothly, the cable pressing cap is in threaded connection with the upper port of the blowout prevention box, a through hole for the cable to pass through is formed in the middle of the cable pressing cap, and an opening is formed in the side end of the through hole in the radial direction to enable the cable to enter the through hole smoothly.
Further, the upper part of the blowout prevention box is formed with internal threads so as to be connected with a cable gland, the lower part of the blowout prevention box is formed with external threads, and the external threads are connected with a tubing coupling, so that the blowout prevention box can be installed on a wellhead.
The utility model has the advantages that:
the inner diameter of the over-cable type wellhead blowout preventer is consistent with the inner diameter of an oil pipe, so that an underground instrument can pass through and be lifted conveniently. The wellhead blowout preventer has the advantages of small volume, light weight, easy installation and disassembly and convenient construction, and can meet the wellhead cable blowout prevention operation of the pressure sealing requirements of wellhead static sealing less than 15MPa and dynamic sealing less than 8 MPa.
Compared with a conventional wellhead cable blowout preventer, the wellhead blowout prevention rubber ring is assembled after the instrument passes through the blowout prevention box without cutting off the cable in the installation process. Need not to install well head blowout preventer in advance on the cable, other operations can be implemented at any time to the cable car, have increased the utilization ratio of cable car, have increased the efficiency of logging construction by a wide margin. The utility model discloses small, light in weight, simple process, operation are swift, the installation of being convenient for, the practicality is strong, and application scope is extensive, and manufacturing cost and construction cost are low, the facilitate promotion, and application prospect is extensive.
Drawings
FIG. 1 is a schematic structural view of the cable-type wellhead blowout preventer of the present invention;
fig. 2 is a schematic structural view of a T-shaped assembling and disassembling tool.
Detailed Description
The invention will be described in further detail with reference to the following drawings and detailed description:
as shown in fig. 1, the utility model discloses a cable formula well head blowout preventer includes preventing spouting box 1, gasket 2, a plurality of rubber circle 3 and cable pressure cap 4.
The blowout prevention box 1 is of a pipe body structure, an internal thread 11 is formed on the inner wall of the upper portion of the blowout prevention box, an external thread 12 is formed on the outer wall of the lower portion of the blowout prevention box, and a step is further arranged on the inner wall of the blowout prevention box. Wherein the connection of the external threads 12 to the tubing collar enables the blowout preventer to be installed on a wellhead.
The gasket 2 is of an oblate structure, the outer diameter of the gasket is matched with the inner diameter of the blowout prevention box 1, the gasket is installed in the blowout prevention box 1 and limited on a step, and a bayonet 21 is formed on the gasket 2 so as to be clamped on a cable conveniently.
The rubber rings 3 are arranged in the blowout prevention box 1 and are sequentially stacked on the gasket 2 and are compressed by the cable gland 4. The rubber ring 3 is of an oblate structure and plays a role in sealing, and the outer diameter of the rubber ring is matched with the inner diameter of the blowout prevention box 1. A central hole 31 for a cable to pass through is formed in the middle of each rubber ring 3 in a vertically penetrating manner, and a cut 32 is formed at the side end of each central hole 31 in the radial direction so that the cable can smoothly enter the central hole 31.
The cable gland 4 is connected with the internal thread 11 of the upper port of the blowout preventer 1, a through hole 41 for the cable to pass through is formed in the middle of the cable gland 4, and an opening 42 is radially formed at the side end of the through hole 41 so that the cable can smoothly enter the through hole 41.
As shown in fig. 2, there is shown a T-shaped assembling and disassembling tool, which comprises a T-shaped frame 51 and a pipe 52 with an opening, wherein the lower end of the T-shaped frame 51 is eccentrically fixed on the upper end of the pipe 52. This T word assembly and disassembly tools mainly used rubber circle 3's installation compresses tightly.
Before the underground testing instrument enters a well, the blowout prevention box 1 is installed at a well mouth, after the underground testing instrument passes through the blowout prevention box 1, the gasket 2 is clamped on a cable and placed into the blowout prevention box 1, then the rubber rings 3 are placed into the blowout prevention box 1 one by one and are pressed by a T-shaped dismounting tool. Quantitative butter is injected into every 2 rubber rings 3, and the quantitative rubber rings 3 are filled according to different pressures. The higher the wellhead pressure that needs to be sealed, the greater the number of rubber rings 3 installed. After the rubber ring 3 is installed, the cable pressing cap 4 is installed on the upper portion of the blowout prevention box 1 and is slowly screwed down, and the rubber ring 3 is tightly pressed. The degree of compaction is adjusted according to the pressure of the well and the weight of the downhole instruments, with higher pressures and heavier instruments, greater degrees of compaction.
In summary, the present invention is not limited to the above embodiments, and those skilled in the art can provide other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.

Claims (2)

1. An over-cable wellhead blowout preventer, characterized in that: the blowout prevention device comprises a blowout prevention box, a gasket, a plurality of rubber rings and a cable pressing cap, wherein the blowout prevention box is of a pipe body structure, and the lower end of the blowout prevention box is installed on a wellhead; the gasket is limited on a step on the inner wall of the blowout prevention box, and a bayonet is formed on the gasket so as to be clamped on the cable conveniently; the rubber ring is arranged in the blowout prevention box, stacked on the gasket in sequence and compressed tightly by the cable pressing cap, wherein each rubber ring is vertically penetrated in the middle to form a center hole for a cable to pass through, a notch is formed in the side end of each center hole in the radial direction to enable the cable to enter the center hole smoothly, the cable pressing cap is in threaded connection with the upper port of the blowout prevention box, a through hole for the cable to pass through is formed in the middle of the cable pressing cap, and an opening is formed in the side end of the through hole in the radial direction to enable the cable to enter the through hole smoothly.
2. The cable wellhead blowout preventer of claim 1, wherein: the upper part of the blowout prevention box is provided with internal threads so as to be connected with a cable pressing cap, and the lower part of the blowout prevention box is provided with external threads which are connected with a tubing coupling, so that the blowout prevention box can be installed on a wellhead.
CN201921038507.0U 2019-07-04 2019-07-04 Cable-passing wellhead blowout preventer Active CN210483620U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921038507.0U CN210483620U (en) 2019-07-04 2019-07-04 Cable-passing wellhead blowout preventer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921038507.0U CN210483620U (en) 2019-07-04 2019-07-04 Cable-passing wellhead blowout preventer

Publications (1)

Publication Number Publication Date
CN210483620U true CN210483620U (en) 2020-05-08

Family

ID=70529804

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921038507.0U Active CN210483620U (en) 2019-07-04 2019-07-04 Cable-passing wellhead blowout preventer

Country Status (1)

Country Link
CN (1) CN210483620U (en)

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Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20201230

Address after: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd.

Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd.

Patentee after: CHINA NATIONAL PETROLEUM Corp.

Address before: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd.

Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd.

TR01 Transfer of patent right