CN108086939B - Inclined three-way bypass blanking plug - Google Patents

Inclined three-way bypass blanking plug Download PDF

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Publication number
CN108086939B
CN108086939B CN201711308635.8A CN201711308635A CN108086939B CN 108086939 B CN108086939 B CN 108086939B CN 201711308635 A CN201711308635 A CN 201711308635A CN 108086939 B CN108086939 B CN 108086939B
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China
Prior art keywords
short section
skeleton
joint
seal
leather cup
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Application number
CN201711308635.8A
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Chinese (zh)
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CN108086939A (en
Inventor
何连
韦龙贵
蒋东雷
黄清
苏剑波
张涛
冉风光
王恒
许成强
刘贤玉
康文泉
甘永平
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
Original Assignee
China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
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Application filed by China National Offshore Oil Corp CNOOC, CNOOC China Ltd Zhanjiang Branch filed Critical China National Offshore Oil Corp CNOOC
Priority to CN201711308635.8A priority Critical patent/CN108086939B/en
Publication of CN108086939A publication Critical patent/CN108086939A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/127Packers; Plugs with inflatable sleeve

Abstract

The invention discloses an inclined tee joint bypass plug which comprises a tapered leather cup, an inserting positioning seal, a threaded joint, a framework short section, a connecting threaded sleeve, a lengthened short section and an O-shaped seal ring. This patent can reduce the safety risk and can reduce the working costs again.

Description

Inclined three-way bypass blanking plug
Technical Field
The invention relates to the field of petrochemical industry, in particular to an inclined three-way bypass blanking plug.
Background
At present, the next operation can be carried out after the well killing operation is carried out on the offshore electric pump production well in China by a circulation channel before the well is re-completed or repaired. Generally, for a production string with a sliding sleeve, a circulation channel is a Christmas tree kill wing valve, an oil pipe, a sliding sleeve, an oil sleeve annulus and an oil pipe four-way joint, the maximum depth of kill circulation is the depth of the sliding sleeve, and for another production string with a deflation valve, a squeezing anticoagulant channel is reserved and an electric pump check valve is cancelled, the production string circulation channel is the Christmas tree kill wing valve, the oil pipe, an electric pump suction inlet, the oil sleeve annulus, a deflation valve, the oil sleeve annulus and the oil pipe four-way joint, the maximum depth of kill circulation is the depth of the electric pump suction inlet, the two modes can not fully utilize the maximum length of the string as a kill channel, so the kill can be completed only by relatively increasing the specific gravity of kill fluid, and two problems are brought:
safety problem. The well killing channel is shallow, so that the depth of the high-specific-gravity well killing fluid accounts for a small proportion of the whole shaft, and the well killing fluid is positioned at the upper part of the shaft, so that induced blowout is easily caused due to the pumping action in the process of lifting the pipe column, and the safety risk is generated. Secondly, the high-specific-gravity upper well control fluid sinks along with the prolonging of time, and the specific gravity of the well control fluid is reduced after the well control fluid is mixed with the low-specific-gravity fluid in the shaft, so that the risk of well kick and blowout caused by pressure imbalance is caused.
② the problem of expense. The high specific gravity well killing fluid needs more well killing materials, and the well killing materials with relatively high price need to be used to avoid the pollution of oil and gas reservoirs to the maximum extent, so that the material cost is correspondingly increased, and the operation cost is increased.
At present, the offshore electric pump production well needs to carry out well killing operation before re-completion or workover operation, and a certain potential safety hazard exists and the operation cost is increased due to a shallow well killing circulation channel.
Disclosure of Invention
In order to overcome the above disadvantages, the present invention provides a slant tee bypass plugging device which can fully utilize the length of the production string to maximize the depth of the kill circulation channel, thereby achieving the dual effects of reducing the safety risk and the operation cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the inclined tee joint bypass plug comprises a tapered leather cup, an inserting positioning seal, a threaded joint, a skeleton short section, a connecting threaded sleeve, a lengthened short section and an O-shaped seal ring, wherein the threaded joint is in threaded connection with one end of the skeleton short section, the other end of the skeleton short section is in threaded connection with one end of the lengthened short section through the connecting threaded sleeve, the other end of the lengthened short section is in threaded connection with one end of the inserting positioning seal, the other end of the inserting positioning seal is inserted into a working barrel connected with one port of an inclined tee joint, the O-shaped seal ring is arranged between the inserting positioning seal and the working barrel, the tapered leather cup is arranged on the skeleton short section and is positioned in an oil pipe connected with the other port of the inclined tee joint so as to seal an annular space between the skeleton short section and the oil pipe, a bypass channel of the inclined tee joint connected with an electric pump is not communicated with the oil pipe short section and the working barrel respectively, and a killing channel is formed in the framework short section, the lengthened short section and the inserting positioning seal.
The tee bend is a universal name in the field of oil exploitation, wherein TOOL refers to a tee joint, the tee bend is a tee bend, the concrete structure is a straight pipe, two ends of the straight pipe are connecting ends, a bypass pipe is communicated with the pipe wall of the straight pipe, and in the field of oil exploitation equipment processing, the tee bend is familiar and very universal when lifted, but the name of the tee bend is rarely used, so that the name of the tee bend is also reserved in the patent name.
Further, still include bearing ring and fixed cover, one section pipe wall thickening of skeleton nipple joint forms a step at the surface of skeleton nipple joint, and bearing ring alternates on the skeleton nipple joint and support in step department, the toper leather cup alternates in the periphery of skeleton nipple joint and sits on bearing ring, and fixed cover is fixed the tight fixed with toper leather cup top on the skeleton nipple joint, toper leather cup, bearing ring and fixed cover constitute a seal assembly.
Furthermore, the number of the sealing assemblies is more than two, in two adjacent sealing assemblies, the bearing ring in the upper sealing assembly is supported on the fixing sleeve in the lower sealing assembly, and the threaded joint tightly supports and fixes the fixing sleeve in the uppermost sealing assembly.
Furthermore, more than two O-shaped sealing rings are arranged.
The invention has the beneficial effects that:
because each part of the bypass blanking plug can be disassembled and assembled through threaded connection, the parts can be combined on site according to actual conditions, and smooth operation is ensured;
because the framework short section, the lengthened short section and the inserting positioning seal are all tubular structures, a well killing channel is formed in the framework short section, the lengthened short section and the inserting positioning seal, the length of the production pipe column can be fully utilized to maximize the depth of a well killing circulation channel, and the double effects of reducing the safety risk and the operation cost are achieved;
the sealing effect is greatly improved due to the use of more than two O-shaped sealing rings;
due to the adoption of the shape of the conical packing cups, the sealing reliability is improved under the action of pressure, the number of the conical packing cups can be selected according to the pressure-resistant level, and the pressure resistance and the sealing property of the bypass blanking plug are improved;
the plugging device can be installed in place in advance in a sealing mode, normal work of other procedures is not affected, the installation operation time of the plugging device is saved, fishing operation is not needed after the plugging device is used, the plugging device can be taken out along with a production pipe column, and the plugging device is convenient to use;
because one section pipe wall of skeleton nipple joint is thickened, has improved intensity, can use the steel wire operation jarring to make it send into when putting in place not in place, and can not damage the blanking plug.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a threaded joint; 2. a skeleton nipple; 3. fixing a sleeve; 4. a conical leather cup; 5. a bearing ring; 6. connecting a threaded sleeve; 7. lengthening the short section; 8. inserting, positioning and sealing; 9. an O-shaped sealing ring; 10. a kill passage; 11. a step; A. an inclined tee joint; B. a working barrel; C. an oil pipe; D. and a bypass channel of the inclined tee joint connected with the electric pump.
Detailed Description
As shown in fig. 1, the inclined tee bypass blanking plug comprises a threaded joint 1, a framework short section 2, a fixing sleeve 3, a conical leather cup 4, a bearing ring 5, a connecting threaded sleeve 6, a lengthened short section 7, an inserting positioning seal 8 and an O-shaped seal ring 9, wherein more than two O-shaped seal rings 9 are arranged. The threaded joint 1 is in threaded connection with one end of the framework short section 2, the other end of the framework short section 2 is in threaded connection with one end of the lengthened short section 7 through the connecting threaded sleeve 6, the other end of the lengthened short section 7 is in threaded connection with one end of the inserting positioning seal 8, the other end of the inserting positioning seal 8 is inserted into the working barrel B connected with one port of the inclined tee joint A, the O-shaped sealing ring 9 is arranged between the inserting positioning seal 8 and the working barrel B, the tapered leather cup 4 is arranged on the framework nipple 2 and is positioned in an oil pipe C connected with the other port of the inclined tee joint to seal an annular space between the framework nipple 2 and the oil pipe C, and a bypass channel D of an inclined tee joint connected with the electric pump is not communicated with the oil pipe C and the working barrel B respectively, the framework short section 2, the lengthened short section 7 and the inserting positioning seal 8 are all tubular structures, and a kill-well channel 10 is formed in the framework short section 2, the lengthened short section 7 and the inserting positioning seal 8. One section pipe wall thickening of skeleton nipple joint 2 forms a step 11 at skeleton nipple joint 2's surface, and bearing ring 5 alternates on skeleton nipple joint 2 and supports in step 11 department, toper leather cup 4 alternates in skeleton nipple joint 2's periphery and sits on bearing ring 5, and fixed cover 3 overlaps tightly fixedly with toper leather cup 4 top on skeleton nipple joint 2, toper leather cup 4, bearing ring 5 and fixed cover 3 constitute a seal assembly.
Further, the sealing assembly is provided with two adjacent sealing assemblies, a supporting ring in the upper sealing assembly is supported on a fixing sleeve in the lower sealing assembly, and the threaded joint 1 tightly supports and fixes the fixing sleeve in the uppermost sealing assembly.
The characteristics of this patent: the invention has simple structure, easy processing and low cost, can be repeatedly used and improves the utilization rate. The tool has an independent internal channel, and the normal circulation channel is not influenced when the inclined three-way electric pump bypass channel is closed. The invention can increase the depth of the killing circulation channel without using other equipment tools, reduce the specific gravity of the killing fluid, improve the safety and the cost of operation, save the time of a well head, can perform advanced or independent cross operation, save the operation time and improve the operation timeliness. The technology increases the length of a circulating kill-job channel by closing the inclined three-way electric pump through a side channel, reduces the use cost of materials while reducing the safety risk, and is particularly more remarkable and important for the advantages of a well with higher formation pressure coefficient.

Claims (4)

1. The utility model provides a tee bend bypass blanking plug that inclines which characterized in that: the sealing device comprises a tapered leather cup, an inserting positioning seal, a threaded joint, a framework short section, a connecting threaded sleeve, a lengthened short section and an O-shaped sealing ring, wherein the threaded joint is in threaded connection with one end of the framework short section, the other end of the framework short section is in threaded connection with one end of the lengthened short section through the connecting threaded sleeve, the other end of the lengthened short section is in threaded connection with one end of the inserting positioning seal, the other end of the inserting positioning seal is inserted into a working barrel connected with one port of an inclined tee, the O-shaped sealing ring is arranged between the inserting positioning seal and the working barrel, the tapered leather cup is arranged on the framework short section and is positioned in an oil pipe connected with the other port of the inclined tee so as to seal an annular space between the framework short section and the oil pipe, a bypass channel of the inclined tee connected with an electric pump is not communicated with the oil pipe and the working barrel short section respectively, and a killing channel is formed in the framework short section, the lengthened short section and the inserting positioning seal.
2. The mitre bypass blanking plug of claim 1, wherein: still include bearing ring and fixed cover, one section pipe wall thickening of skeleton nipple joint forms a step at the surface of skeleton nipple joint, and the bearing ring alternates on the skeleton nipple joint and support in step department, the toper leather cup alternates in the periphery of skeleton nipple joint and sits on the bearing ring, and fixed cover is fixed with toper leather cup top tightly on the skeleton nipple joint, toper leather cup, bearing ring and fixed cover constitute a seal assembly.
3. The mitre bypass blanking plug of claim 2, wherein: the sealing assembly is provided with more than two sealing assemblies, in two adjacent sealing assemblies, a bearing ring in the upper sealing assembly is supported on a fixing sleeve in the lower sealing assembly, and the threaded joint tightly supports and fixes the fixing sleeve in the uppermost sealing assembly.
4. The mitre bypass blanking plug of claim 1, wherein: the O-shaped sealing rings are more than two.
CN201711308635.8A 2017-12-11 2017-12-11 Inclined three-way bypass blanking plug Active CN108086939B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711308635.8A CN108086939B (en) 2017-12-11 2017-12-11 Inclined three-way bypass blanking plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711308635.8A CN108086939B (en) 2017-12-11 2017-12-11 Inclined three-way bypass blanking plug

Publications (2)

Publication Number Publication Date
CN108086939A CN108086939A (en) 2018-05-29
CN108086939B true CN108086939B (en) 2020-09-01

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201857934U (en) * 2010-11-11 2011-06-08 中国石油天然气集团公司 Special sealing intubation tube for sealing packer
GB2518683B (en) * 2013-09-30 2016-08-10 Swellfix Bv Sealing Insert and method
CN104912512B (en) * 2015-06-29 2018-12-21 中国海洋石油集团有限公司 It is intubated packing device
CN205189810U (en) * 2015-12-10 2016-04-27 天津克睿特维科技发展有限公司 Wellhead sealing device

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