CN110886589A - System and method for preventing slurry leakage of rotary blowout preventer - Google Patents
System and method for preventing slurry leakage of rotary blowout preventer Download PDFInfo
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- CN110886589A CN110886589A CN201911044761.6A CN201911044761A CN110886589A CN 110886589 A CN110886589 A CN 110886589A CN 201911044761 A CN201911044761 A CN 201911044761A CN 110886589 A CN110886589 A CN 110886589A
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- 239000002002 slurry Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 230000002265 prevention Effects 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 208000027418 Wounds and injury Diseases 0.000 abstract description 5
- 230000006378 damage Effects 0.000 abstract description 5
- 208000014674 injury Diseases 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/08—Wipers; Oil savers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/08—Wipers; Oil savers
- E21B33/085—Rotatable packing means, e.g. rotating blow-out preventers
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- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the technical field of installation of a pressure-controlled drilling rotary blowout preventer in an oil field drilling technology, and particularly relates to a system and a method for preventing slurry leakage of the rotary blowout preventer. The invention has carried on the perfect resetting to the double ram blowout preventer, annular blowout preventer, rotary blowout preventer connected with hydraulic throttle valve and outlet pipeline that are usually installed from bottom to top, by the anti-overflow barrel connected to rotary blowout preventer, connect heightening flange, hydraulic throttle valve, slurry discharge pipeline, stop valve, outlet pipeline and organic setting of the slurry discharge pipeline between rotary blowout preventer and annular blowout preventer, make the invention prevent the rotary blowout preventer from polluting the appearance of dirt, square well and surrounding ground pollution caused by mud that the rotary blowout preventer overflows effectively, and has avoided the injury of slipping and falling of the operating personnel that causes consequently.
Description
Technical Field
The invention belongs to the technical field of oil field drilling, and particularly relates to a system and a method for preventing slurry leakage of a rotary blowout preventer.
Background
For the 'three-low' oil-gas field, the technology of main development is that the oil is injected first and then produced. Due to the fact that water is injected for a long time, the reservoir is abnormally high in pressure, and the technical problems of well drilling such as overflow water, associated gas and blowout simultaneous storage exist in the well drilling process, the phenomena of difficulty in well drilling, high well control risk and poor well cementation quality are caused. So far, the situation of well control dangerous case in the water injection area of the 'three-low' oil and gas field is frequent. In order to avoid the occurrence of well control dangerous cases, the conventional method mainly realizes safe drilling by taking measures of stopping injection and relieving pressure of an adjacent water injection well, and in order to further ensure the well control safety, a well head pressure control drilling technology is researched, popularized and applied, and the technology can effectively prevent and control well drilling overflow, reduce well drilling well control risks, reduce well drilling loss and realize safe drilling. However, in the current field application, the problems that the service life of the rubber core of the rotary blowout preventer is short, and the rubber core tears and leaks slurry when the wellhead is installed incorrectly or rotates and wears, so that the leaked slurry cannot be recovered in time and the well control equipment and the ground below the rotary blowout preventer are polluted are mainly solved. Moreover, the outlet of the rotary blowout preventer is 177.8mm, and the inner diameter of the port of the hydraulic shutoff valve is 130mm, so that the requirements of a wellhead screw testing and drilling mud discharging cannot be met, and serious mud leakage is caused in the use process of the rotary blowout preventer system.
Disclosure of Invention
The invention provides a system and a method for preventing slurry leakage of a rotary blowout preventer, and aims to provide a system and a method for effectively preventing slurry leakage of the rotary blowout preventer from overflowing and recycling in the use process.
In order to achieve the purpose, the invention adopts the technical scheme that:
a rotary blowout preventer slurry leakage prevention system at least comprises a blowout preventer stack, wherein the blowout preventer stack consists of a double-ram blowout preventer, an annular blowout preventer and a rotary blowout preventer which are sequentially connected from bottom to top, and further comprises an anti-overflow barrel, a flange and a slurry discharge pipeline; the anti-overflow barrel is hermetically connected to the upper surface of the rotary blowout preventer, and the lower surface of the anti-overflow barrel is connected with a slurry discharge pipeline communicated with a discharge pipeline of the rotary blowout preventer; the flange is connected between the rotary blowout preventer and the annular blowout preventer.
The anti-overflow barrel is connected with the rotary blowout preventer in a sealing mode through a rubber pad.
The upper portion of anti-overflow bucket uncovered, the lower surface is connected with cyclic annular bottom surface, cyclic annular bottom surface is opened has connect the through-hole and arranges thick liquid pipeline connector.
The flange is a heightening flange, and the height of the heightening flange is set to be 0.7-1.5 m.
The height of the heightening flange is 1.5 m.
The side wall of the heightening flange is connected with a shutoff valve, and the shutoff valve is also connected with an outlet pipeline; the discharge lines of the outlet lines are communicated.
The lateral wall of rotatory preventer is connected with the choke valve that surges, the thick liquid pipeline of arranging is connected at the output of choke valve that surges.
The upper surface of the rotary blowout preventer is connected with a lock catch, and the side wall of the anti-overflow barrel is provided with two parallel grooves for connecting with the lock catch on the upper surface of the rotary blowout preventer.
The cross section of the anti-overflow bucket be circle, and the external diameter of anti-overflow bucket equals with the external diameter of rotatory preventer.
A method for preventing slurry leakage of a rotary blowout preventer comprises the following steps
The method comprises the following steps: device connection
Connecting a rotary blowout preventer slurry leakage prevention system to a drilling wellhead;
step two: open the valve while drilling operation
And after the first step is finished, performing drilling operation, opening a valve, and flowing slurry overflowed by the hydraulic throttling valve and the shutoff valve to a discharge pipeline connected with the heightening flange through a slurry discharge pipeline. After the second step is finished, pressure control drilling is started;
step four: discharge of leakage slurry
And in the step three-control pressure drilling process, when the rotary blowout preventer has overflowed mud, the overflowed mud is collected in the main anti-overflow bucket and then flows to a discharge pipeline of the rotary blowout preventer through a mud discharge pipeline.
Step five: open valve during tripping operation
And after the fourth step is finished, carrying out the drill pulling operation, opening the valve, and flowing the slurry overflowed by the hydraulic throttling valve and the shutoff valve to a discharge pipeline connected with the heightening flange through a slurry discharge pipeline.
Has the advantages that:
the anti-overflow barrel, the heightening flange and the anti-overflow pipeline are arranged, so that slurry overflowing in the processes of tripping and pressure-controlled drilling is timely recycled into the pipeline, the problems of dirt of the rotary blowout preventer and pollution to a square well and the surrounding ground caused by the slurry overflowing from the rotary blowout preventer are effectively prevented, and the sliding, falling and injury of operators caused by the slurry are avoided.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the spill prevention bucket of the present invention;
FIG. 3 is a top plan view of the spill prevention bucket of the present invention;
fig. 4 is a use state diagram of the present invention.
In the figure: 1-a rotary blowout preventer; 2-anti-overflow barrel; 3-a hydraulic throttle valve; 4-a flange; 5-a shut-off valve; 6-an outlet line; 7-rubber pad; 8-a slurry discharge line; 9-locking; 10-a set screw; 11-double ram blowout preventers; 12-an annular blowout preventer; 13-slurry discharge pipeline connecting port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
according to the rotary blowout preventer slurry leakage prevention system shown in the figure 1, the rotary blowout preventer slurry leakage prevention system at least comprises a blowout preventer stack, an anti-overflow barrel 2, a flange 4 and a slurry discharge pipeline 8, wherein the blowout preventer stack consists of a double-ram blowout preventer 11, an annular blowout preventer 12 and a rotary blowout preventer 1 which are sequentially connected from bottom to top; the anti-overflow barrel 2 is hermetically connected to the upper surface of the rotary blowout preventer 1, and the lower surface of the anti-overflow barrel 2 is connected with a slurry discharge pipeline 8 communicated with a discharge pipeline of the rotary blowout preventer 1; the flange 4 is connected between the rotary blowout preventer 1 and the annular blowout preventer 12.
When the rotary blowout preventer is in practical use, the rotary blowout preventer is firstly connected to a well mouth of a drilling well, and when the rotary blowout preventer is subjected to improper installation or rotary abrasion of the well mouth in the use process, the rubber core tears and produces slurry, so that leaked slurry is produced directly from the upper part of the rubber core, collected in the anti-overflow barrel 2 through the rotary blowout preventer and then flows into a discharge pipeline of the rotary blowout preventer 1 through the slurry discharge pipeline 8.
By using the technical scheme, the problems of dirt of the rotary blowout preventer, square well and surrounding ground pollution caused by the overflow of slurry overflowing from the rotary blowout preventer are effectively prevented, and the slipping and falling injury of operators caused by the dirt of the rotary blowout preventer is avoided.
Example two:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the first embodiment is that: the anti-overflow barrel 2 is hermetically connected with the rotary blowout preventer 1 through a rubber gasket 7.
In actual use, the anti-overflow barrel 2 is in sealing connection with the rotary blowout preventer 1 through the rubber gasket 7, and slurry leakage caused by poor sealing is prevented. Adopt rubber pad 7 to seal, with low costs and sealed effectual.
Example three:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the first embodiment is that: the upper portion of anti-overflow bucket 2 uncovered, the lower surface is connected with cyclic annular bottom surface, cyclic annular bottom surface is opened has connect the through-hole and arranges thick liquid pipeline connector 13.
In practical use, the anti-overflow barrel 2 can be connected with the rotary blowout preventer 1 only through the fixing screws 10 by adopting the technical scheme, so that the anti-overflow barrel is simple and convenient.
Example four:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the first embodiment is that: the flange 4 is a heightening flange, and the height of the heightening flange is set to be 0.7-1.5 m.
The height of the heightening flange is 1.5 m;
the side wall of the heightening flange is connected with a shutoff valve 5, and the shutoff valve 5 is also connected with an outlet pipeline 6; the outlet line 6 communicates with the discharge line of the rotary blowout preventer 1.
In the time of the in-service use, because rotatory preventer export internal diameter is 177.8mm, and the choke valve port internal diameter that surges is 130mm, at well head examination screw rod and the in-process of drilling down, mud can not in time discharge from the choke valve that surges, spills over from the well head easily and leads to the unable recovery of mud and pollute ground. Through designing one and increasing the flange, connect a discharge line on increasing the flange, increased and discharged the circulation passageway, finally collect the mud that anti-overflow bucket 2 was discharged on main anti-overflow pipeline.
The arrangement of the shutoff valve 5 can be used for opening and closing the valve according to requirements, the shutoff valve is closed when pressure is controlled as required, and the screw rod is opened in the process of drilling down to increase the drainage area.
The height of the heightening flange is set to be 0.7-1.5m, and the specific height is designed according to the height space of the base of the drilling machine so as to be capable of arranging a discharge pipeline and increase a discharge circulation channel. When the height of the base is 9m, the height of the heightening flange can be processed by 1.5 m.
Example five:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the fourth embodiment is that: the lateral wall of rotatory preventer 1 is connected with throttle valve 3 that surges, arrange thick liquid pipeline 8 and connect the output at throttle valve 3 that surges.
When in actual use, adopt this technical scheme, can open and close throttle valve 3 that surges as required for the well bore pressure of accuse pressure drilling is controllable.
Example six:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the first embodiment is that: the upper surface of the rotary blowout preventer 1 is connected with a lock catch 9, and the side wall of the anti-overflow barrel 2 is provided with two parallel grooves for connecting with the lock catch 9 on the upper surface of the rotary blowout preventer 1.
In actual use, the anti-spill bucket 2 is provided with a lock catch 9 at the housing opening position of the rotary blowout preventer 1, so that slurry leakage at the housing opening position is prevented.
Example seven:
according to a rotary blowout preventer slurry leakage prevention system shown in fig. 1, the difference from the first embodiment is that: the cross section of the anti-overflow bucket 2 is round, and the outer diameter of the anti-overflow bucket 2 is equal to that of the rotary blowout preventer 1.
When in actual use, when the top cover at the upper part of the rotary blowout preventer is opened to replace the rubber core, the anti-overflow barrel 2 is convenient to open, and the rubber core replacement is not influenced.
Example eight:
the system for preventing slurry leakage of the rotary blowout preventer, which is shown in the figure 1, at least comprises a blowout preventer stack, an anti-overflow barrel 2, a heightening flange 4 and a slurry discharge pipeline 8, wherein the blowout preventer stack consists of a double-ram blowout preventer 11, an annular blowout preventer 12 and the rotary blowout preventer 1 which are sequentially connected from bottom to top; the anti-overflow barrel 2 is hermetically connected to the upper surface of the rotary blowout preventer 1 through a rubber gasket 7, and the lower surface of the anti-overflow barrel 2 is connected with a slurry discharge pipeline 8 communicated with a discharge pipeline of the rotary blowout preventer 1; the heightening flange 4 is connected between the rotary blowout preventer 1 and the annular blowout preventer 12; the cross section of the anti-overflow barrel 2 is round, and the outer diameter of the anti-overflow barrel 2 is equal to that of the rotary blowout preventer 1; the upper part of the anti-overflow barrel 2 is open, the lower surface of the anti-overflow barrel is connected with an annular bottom surface, and the annular bottom surface is provided with a connecting through hole and a slurry discharge pipeline connecting port 13; the flange 4 is a heightened flange, and the height of the heightened flange is set to be 1.5 m; the side wall of the heightening flange is connected with a shutoff valve 5, and the shutoff valve 5 is also connected with an outlet pipeline 6; the outlet line 6 communicates with the discharge line of the rotary blowout preventer 1; the side wall of the rotary blowout preventer 1 is connected with a hydraulic throttle valve 3, and the slurry discharge pipeline 8 is connected to the output end of the hydraulic throttle valve 3; the upper surface of the rotary blowout preventer 1 is connected with a lock catch 9, and the side wall of the anti-overflow barrel 2 is provided with two parallel grooves for connecting with the lock catch 9 on the upper surface of the rotary blowout preventer 1.
In actual use, after the rotary blowout preventer slurry leakage prevention system is connected to a drilling wellhead, the hydraulic throttle valve 3 and the shutoff valve 5 are opened, and then pressure-controlled drilling is started; when the rotary blowout preventer 1 has overflowed mud during drilling, the overflowed mud collects in the main anti-spill barrel 2 and then flows through the mud discharge line to the discharge line of the rotary blowout preventer 1. And (4) carrying out the drilling operation, opening the hydraulic throttling valve 3 and the shutoff valve 5, and flowing the slurry overflowed by the hydraulic throttling valve and the shutoff valve to a discharge pipeline connected with the heightening flange through a slurry discharge pipeline.
By adopting the anti-overflow device, the overflowed slurry is effectively collected in the main anti-overflow barrel 2 and is timely recycled into a pipeline, the problems of dirt of the rotary blowout preventer, pollution to a square well and the surrounding ground caused by the slurry overflowed by the rotary blowout preventer are avoided, and the sliding and falling injuries of operators caused by the problems are avoided.
Example nine:
a method of preventing a blowout preventer from leaking slurry according to the rotary blowout preventer shown in fig. 2, comprising the steps of:
the method comprises the following steps: device connection
Connecting a rotary blowout preventer slurry leakage prevention system to a drilling wellhead;
step two: drill opening valve
After the first step is finished, opening the hydraulic throttle valve 3 and the shutoff valve 5;
step three: start pressure control drilling
After the second step is finished, pressure control drilling is started;
step four: discharge of leakage slurry
In the third drilling process, when the rotary blowout preventer 1 has overflowed mud, the overflowed mud is collected in the main anti-overflow bucket 2 and then flows to the discharge pipeline of the rotary blowout preventer 1 through the mud discharge pipeline.
Step five: open valve during tripping operation
And after the fourth step is finished, performing the drilling operation, opening the hydraulic throttling valve 3 and the shutoff valve 5, and enabling slurry overflowing from the hydraulic throttling valve and the shutoff valve to flow to a discharge pipeline connected with the heightening flange through a slurry discharge pipeline.
In actual use, the technical scheme of the invention effectively collects the mud produced by improper installation of a wellhead or rotary abrasion and rubber core tearing in the using process of the rotary blowout preventer through the rotary blowout preventer and then flows into the discharge pipeline of the rotary blowout preventer 1 through the slurry discharge pipeline 8 after being collected in the anti-overflow barrel 2, thereby preventing the mud overflowing from the rotary blowout preventer from overflowing to cause the problems of dirt of the rotary blowout preventer, square well and surrounding ground pollution, and avoiding the sliding and falling injuries of operators caused by the mud overflowing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a rotatory preventer prevents system of leaking thick liquid, includes the blowout preventer stack at least, and the blowout preventer stack comprises from down supreme double ram preventer (11), annular preventer (12) and rotatory preventer (1) that connect gradually, its characterized in that: the overflow-proof barrel (2), the heightening flange (4) and the slurry discharge pipeline (8) are also included; the anti-overflow barrel (2) is connected to the upper surface of the rotary blowout preventer (1) in a sealing manner, and the lower surface of the anti-overflow barrel (2) is connected with a slurry discharge pipeline (8) communicated with a discharge pipeline of the rotary blowout preventer (1); the heightening flange (4) is connected between the rotary blowout preventer (1) and the annular blowout preventer (12).
2. The rotary blowout preventer mud leakage prevention system of claim 1, wherein: the anti-overflow barrel (2) is in sealed connection with the rotary blowout preventer (1) through a rubber gasket (7).
3. A rotary blowout preventer slurry leakage prevention system according to claim 1 or 2, wherein: the upper portion of anti-overflow bucket (2) uncovered, the lower surface is connected with cyclic annular bottom surface, cyclic annular bottom surface is opened has connect the through-hole and arranges thick liquid pipeline connector (13).
4. The rotary blowout preventer mud leakage prevention system of claim 1, wherein: the flange (4) is a heightening flange, and the height of the heightening flange is set to be 0.7-1.5 m.
5. The rotary blowout preventer mud leakage prevention system of claim 4, wherein: the height of the heightening flange is 1.5 m.
6. A rotary blowout preventer slurry leakage prevention system according to claim 4 or 5, wherein: the side wall of the heightening flange is connected with a shutoff valve (5), and the shutoff valve (5) is also connected with an outlet pipeline (6); the outlet line (6) is in communication with a discharge conduit of the rotary blowout preventer (1).
7. The rotary blowout preventer mud leakage prevention system of claim 1, wherein: the lateral wall of rotatory preventer (1) is connected with throttle valve (3) that surges, arrange thick liquid pipeline (8) and connect the output at throttle valve (3) that surges.
8. The rotary blowout preventer mud leakage prevention system of claim 1, wherein: the upper surface of the rotary blowout preventer (1) is connected with a lock catch (9), and the side wall of the anti-overflow barrel (2) is provided with two parallel grooves for connecting with the lock catch (9) on the upper surface of the rotary blowout preventer (1).
9. The rotary blowout preventer mud leakage prevention system of claim 1, wherein: the cross section of the anti-overflow barrel (2) is round, and the outer diameter of the anti-overflow barrel (2) is equal to that of the rotary blowout preventer (1).
10. A method for preventing slurry leakage of a rotary blowout preventer is characterized by comprising the following steps
The method comprises the following steps: device connection
Connecting a rotary blowout preventer slurry leakage prevention system to a drilling wellhead;
step two: open the valve while drilling operation
After the first step is finished, opening the hydraulic throttle valve (3) and the shutoff valve (5);
step three: pressure controlled drilling operation
After the second step is finished, closing the shutoff valve (5), and controlling the pressure to drill the well by adjusting the hydraulic throttle valve (3);
step four: discharge of leakage slurry
In the step three-control pressure drilling process, when the rubber core of the rotary blowout preventer (1) is punctured with overflowed mud, the overflowed mud is collected in the main anti-overflow bucket (2) and then flows to a discharge pipeline of the rotary blowout preventer (2) through a mud discharge pipeline.
Step five: open valve during tripping operation
And after the fourth step is finished, opening the hydraulic throttling valve (3) and the shutoff valve (5), and enabling slurry overflowing from the hydraulic throttling valve and the shutoff valve to flow to a discharge pipeline connected with the heightening flange through a slurry discharge pipeline.
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| CN201911044761.6A CN110886589A (en) | 2019-10-30 | 2019-10-30 | System and method for preventing slurry leakage of rotary blowout preventer |
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| CN201911044761.6A CN110886589A (en) | 2019-10-30 | 2019-10-30 | System and method for preventing slurry leakage of rotary blowout preventer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114542004A (en) * | 2022-01-11 | 2022-05-27 | 中海油能源发展股份有限公司 | Adjustable guide pipe tool for installing rotary blowout preventer on wellhead of offshore platform diverter |
| CN114635662A (en) * | 2021-10-26 | 2022-06-17 | 中国石油天然气集团有限公司 | Rotary blowout preventer and system capable of monitoring rubber core state and preventing drilling fluid from overflowing |
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| CN114635662B (en) * | 2021-10-26 | 2024-02-06 | 中国石油天然气集团有限公司 | Rotary blowout preventer capable of monitoring rubber core state and preventing drilling fluid from overflowing and system |
| CN114542004A (en) * | 2022-01-11 | 2022-05-27 | 中海油能源发展股份有限公司 | Adjustable guide pipe tool for installing rotary blowout preventer on wellhead of offshore platform diverter |
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