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Compensation type multi-purpose annular blowout preventer

An annular blowout preventer, multi-purpose technology, applied in the direction of wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problem of not being able to adapt to multiple specifications and different shapes at the same time, the oil pipe cannot be lifted and lowered, and the three gates The plate blowout preventer is complex and other problems, to achieve the effect of improving blowout prevention accidents, good sealing effect under pressure, and light weight

Active Publication Date: 2011-05-18
雷宽成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing ram type BOP has the following disadvantages: first, when the ram of the BOP is tightly holding the oil pipe, the oil pipe cannot be lifted and lowered; secondly, the ram BOP, A pair of rams can only hold pipes of one shape tightly, and cannot adapt to pipes of multiple specifications and shapes at the same time, such as cylindrical, square, and hexagonal tools; Three-ram blowout preventer must be used for functions such as cables, wire ropes, and closing empty wells, and the three-ram blowout preventer is complex, large in size and high in cost

Method used

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  • Compensation type multi-purpose annular blowout preventer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The structural diagram of the compensation type multi-purpose annular blowout preventer is as follows: figure 1 As shown, it at least includes an upper flange 1, a lower flange 5, and a sealing cylinder body. The sealing cylinder body is composed of an inner sealing body 3 and an outer sealing body 4. A space is formed between the outer sealing body 4 and the inner sealing body 3. Cavity structure, the upper end of the outer sealing body 4 is connected with the upper flange 1 with bolts, the lower end of the outer sealing body 4 is connected with the lower flange 5 with threads, and the flange hole of the upper flange 1 communicates with the flange hole of the lower flange 5 up and down ; When the fluid medium is injected into the cavity between the outer sealing body 4 and the inner sealing body 3, the inner sealing body 3 shrinks inward, so that the inner sealing body 3 hugs the oil pipe or cable or closes the empty well, so that the oil pipe fixed by the sealing body ...

Embodiment 2

[0035] The upper flange 1 in embodiment 1 is as Figure 4 As shown, the upper flange 1 is circular, and the outer circle size of the upper flange 1 is consistent with the matching wellhead flange. The thickness of the outer edge of the upper flange 1 is 40 mm to 70 mm. The hole 9, the inner through hole 9 is the through hole of the oil pipe or the tool, and the upper end side wall of the inner through hole 9 has a first internal thread 8.

[0036] The upper surface of the upper flange 1 has a steel ring groove 10, which can cooperate with the steel ring of the matching wellhead upper flange to play a sealing role. There is an annular groove in the middle of the lower part of the upper flange. There is a sealing groove 12 on the upper plane of the annular groove. The annular groove is used to fix the outer edge of the upper part of the inner sealing body 3 and seal the connection position through the sealing groove 12. The upper end of the flange 1 has upper flange bolt holes ...

Embodiment 3

[0040] Inner sealing body 3 in embodiment 1 is as Figure 7 As shown, the inner sealing body 3 is also called the anti-spray rubber sleeve. The inner sealing body 3 is a hollow cylinder. The diameter of the inner hole 16 in the inner sealing body is different. 15. The diameter of the inner hole 16 of the inner seal is the same as that of the remaining sections; the inner seal body 3 has a falling sealing edge 17 on the outer circle of the upper part, and the upper surface of the falling sealing edge 17 has a sealing boss 14, and the inner sealing body 3 is connected to the upper flange 1 at the upper end When the sealing boss 14 cooperates with the sealing groove 12 of the upper flange 1, the sealing is realized; the falling end of the falling sealing edge 17 is the falling sealing ring 18, and the falling sealing ring 18 and the outer circle of the main body of the inner sealing body 3 middle rings 19 has a certain gap, so that the inner sealing body 3 plays a sealing role when...

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Abstract

The invention relates to a blowout preventer of oilfield well mouth seal, in particular to a compensation type multi-purpose annular blowout preventer special for annular sealing and blowout prevention of wellhead oil pipes and bushings during abrasive cleaning operation of running and pulling oil pipes and sleeves of oil and water wells and oil and gas wells. The compensation type multi-purpose annular blowout preventer comprises an upper flange, a lower flange and a sealing cylinder body, wherein the sealing cylinder body is formed by an inner sealing body and an outer sealing body. The compensation type multi-purpose annular blowout preventer is characterized in that a cavity structure is formed between the outer sealing body and the inner sealing body, the upper end of the outer sealing body is connected with the upper flange, and the lower end of the outer sealing body is connected with the lower flange. When a fluid medium is injected into the cavity between the outer sealing body and the inner sealing body, the inner sealing body shrinks inwards, thereby enabling the inner sealing body to tightly hold an oil pipe or a cable or close an empty well and sealing and isolating the upper end and the lower end of the oil pipeline fixed by the sealing body. The invention provides the compensation type multi-purpose annular blowout preventer which has the advantages of light weight, convenience for installation and operation, oil pipe running and pulling operation under pressure, wide pipe well range and good on-line leak sealing effect.

Description

technical field [0001] The invention relates to a blowout preventer for wellhead sealing of oil wells in an oil field, in particular a compensating multi-purpose annular blowout preventer specially used for sealing and blowout prevention of wellhead oil pipe and casing annulus in oil-water wells and oil-gas wells when lifting and lowering oil pipes and casing grinding and washing operations . Background technique [0002] During workover and testing operations in the oil field, on the one hand, in order to prevent oil, water and gas from the annulus of the tubing and casing from upwelling from the wellhead or prevent falling objects from the wellhead from falling into the well, a blowout preventer must be installed at the wellhead. On the other hand, in order to scrape off the oil on the outer wall of the tubing and quickly seal the casing annulus to prevent blowout accidents, it is also necessary to install a blowout preventer at the wellhead. [0003] The existing ram typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/06
Inventor 孙永鹏孙虎李巨才马能平王居民陈存慧高淮伟邓继学张旺宁闵琦李志忠刘新印徐思勇胡慧婷雷宽成
Owner 雷宽成
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