CN204804725U - A well head pressure control device for controlling press well drilling - Google Patents
A well head pressure control device for controlling press well drilling Download PDFInfo
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- CN204804725U CN204804725U CN201520279274.9U CN201520279274U CN204804725U CN 204804725 U CN204804725 U CN 204804725U CN 201520279274 U CN201520279274 U CN 201520279274U CN 204804725 U CN204804725 U CN 204804725U
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- blowout preventer
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- 238000005553 drilling Methods 0.000 title claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 230000001276 controlling effect Effects 0.000 claims description 33
- 230000008520 organization Effects 0.000 claims description 31
- 239000012530 fluid Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract 4
- 239000002343 natural gas well Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 4
- 238000004886 process control Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model provides a well head pressure control device for controlling press well drilling belongs to the oil, natural gas well drilling pressure control equips technical field. Rotating blowout preventer connection pressure meter, liquid accuse wafer valve, liquid accuse choke valve is connected to liquid accuse wafer valve, liquid accuse wafer valve advances oil pipe through liquid accuse wafer valve, liquid accuse wafer valve goes out oil pipe and connects liquid gas control cabinet, liquid accuse choke valve advances the oil pipe line through liquid accuse choke valve, liquid accuse choke valve oil outlet pipeline connects liquid gas control cabinet, the rotating blowout preventer advances the oil pipe line through the rotating blowout preventer, rotating blowout preventer oil outlet pipeline connects liquid gas control cabinet, the oil sources pipeline is connected to liquid gas control cabinet, oil outlet pipeline, air supply pipeline and remote control net twine. The utility model discloses control spin control head and liquid accuse choke valve, reach the purpose of controlling the well head back pressure.
Description
Technical field
The utility model relates to a kind of pressure control device for controlled pressure drilling, belongs to oil, gas drilling Stress control equipment technology field.
Background technology
In oil/gas drilling process; spray, leak, collapse, the down-hole complexity such as card is in most cases all relevant with drilling fluid density and ring governor pressure section; simultaneously; along with drilling technology and the continuous progressive of exploration and development technology find; many difficult problem majorities urgently to be resolved hurrily in exploration and development process all control direct relation with ring governor pressure, as the reservoir protection problem of the narrow Density Window problem in deep drilling process, responsive reservoir, spray are leaked with adjust well development problem under the creep problem on the development problem of layer reservoir, rock salt stratum, exploitation old liberated area complex pressure system etc.Under traditional drilling mode, when solving above-mentioned complex situations, usually adopt the mode of adjustment drilling fluid density, but there is larger limitation in which, be difficult to effectively solve an above-mentioned difficult problem: first, the adjustment cycle time of drilling fluid density is longer, be difficult to tackle changeable down hole problem; Secondly, the adjustment of drilling fluid density is comparatively large on property of drilling fluid impact, and new down hole problem may be caused in adjustment process to occur; Again, adjustment due to drilling fluid density makes bottom pressure change have certain step evolution, the down hole problem occurred under making the control of ring governor pressure section be difficult to tackle complex pressure system condition, therefore, fast, accurately gate ring governor pressure section just becomes an important technology difficult problem urgently to be resolved hurrily in drilling process.
Controlled pressure drilling device is exactly arise at the historic moment under these conditions.Domestic and international bulk petroleum spudder author is by effort for many years, and developed all kinds of controlled pressure drilling device, comprise meticulous controlled pressure drilling equipment, micrometeor controlled pressure drilling equipment etc., above device effectively solves an above-mentioned difficult problem.But along with the propagation and employment of controlled pressure drilling technology, due to the constraint by objective condition, said apparatus shows larger limitation in applying at the scene, first apparatus structure is too complicated, under normal circumstances, said apparatus comprises multiple systems such as back pressure bucking-out system, gas-liquid Ore-controlling Role, automatic control system, cause staff's learning cost increase, difficult in maintenance; Secondly, due to system complex, to result also in equipment volume larger, difficulty is brought to the transport of equipment and placement, controlled pressure drilling technology is restricted in the application of marine drilling and some specific work environments, again, equipment manufacturing cost costliness causes maintenance cost and application cost to increase, also be another main cause that controlled pressure drilling technology can not get extensive use, so, be necessary that utility model one nested structure is simple, small volume, cheap but still can meet the pressure control equipment of controlled pressure drilling technological requirement.The utility model of this patent just provides effective solution for solving the problem, controlled pressure drilling device is made to reach simplification as much as possible, reduce cost, also be convenient to safeguard, simultaneously, can also meet the requirement of controlled pressure drilling technique to equipment, therefore, the utility model of this device is that the extensive promotion and application of controlled pressure drilling technology provide another kind of method.
Utility model content
In order to overcome the deficiencies in the prior art, main purpose of the present utility model is to provide a kind of pressure control device for controlled pressure drilling.
A kind of pressure control device for controlled pressure drilling, rotating blowout preventer Bonding pressure meter, hydraulic control flap type, hydraulic control flap type connects hydraulic control choke valve, hydraulic control flap type is by hydraulic control flap type oil inlet pipe, hydraulic control flap type flowline connecting fluid pneumatic control platform, hydraulic-control throttling valve is by hydraulic-control throttling valve feed line, hydraulic-control throttling valve flow line connecting fluid pneumatic control platform, rotating blowout preventer is by rotating blowout preventer feed line, rotating blowout preventer flow line connecting fluid pneumatic control platform, hydraulic-pneumatic control platform connects oil sources pipeline, flow line, source gas line and Long-distance Control netting twine, hydraulic-pneumatic control platform connects bleed pressure table, oil supply pressure table, wellhead back pressure table, the first explosion-proof display panels, the second explosion-proof display panels, gas source switch, oil sources switch, rotating blowout preventer is released the button, rotating blowout preventer X button, Gas-liquid pump are released the button, Gas-liquid pump X button, hydraulic control flap type are released the button, hydraulic control flap type X button, regulating handle, manual/auto changeover switch and manually protect button.
Present embodiments provide a kind of pressure control device for controlled pressure drilling, oil well pressure controlling organization comprises executing agency and controlling organization, and wherein, executing agency comprises the rotating blowout preventer, hydraulic control flap type and the hydraulic-control throttling valve that are communicated with successively; Rotating blowout preventer comprises the rotating blowout preventer feed line and rotating blowout preventer flow line that are connected with controlling organization respectively, and controlling organization controls the opening and closing of rotating blowout preventer; Hydraulic control flap type comprises the hydraulic control flap type oil inlet pipe and hydraulic control flap type flowline that are connected with controlling organization, and controlling organization controls the aperture of hydraulic control flap type; Hydraulic-control throttling valve comprises the hydraulic-control throttling valve oil inlet pipe and hydraulic-control throttling valve flowline that are connected with controlling organization, and controlling organization controls the aperture of hydraulic-control throttling valve.
Further, executing agency also comprises pressure gauge, and pressure gauge is arranged on the connecting line between rotating blowout preventer and hydraulic control flap type.
Further, controlling organization has the oil-in connecting oil sources pipeline and the oil-out connecting flow line.
Further, controlling organization has automatic control part and Non-follow control portion, can conversion and control function mutually between automatic control part and Non-follow control portion, controlling organization comprises oil supply pressure table for detecting oil sources and the wellhead back pressure table for the well head pressure that detects drilling well.
Further, controlling organization also has the gas source interface for connecting source gas line.
Further, controlling organization is provided with the bleed pressure table for detecting the bleed pressure in source gas line.
Further, controlling organization manually/automatic change-over changes automatic control part and Non-follow control portion.
Further, controlling organization also has the first explosion-proof display panels and the second explosion-proof display panels.
The utility model has the following advantages:
1, control system of the present utility model has automatic and manual operation two and overlaps complete autonomous control system, all can control swivel control head and hydraulic-control throttling valve, reaches the object controlling wellhead back pressure.Under the condition that equipment components normally works, system will be in automatic control state, swivel control head is in closed condition, hydraulic control flap type is in open mode, self-choke control flow according to design controls according to different operating mode by hydraulic-control throttling valve automatically, once automatic control system lost efficacy, be switched to Non-follow control at once, according to the swivel control head duty of hand held console display, the on off state of hydraulic control flap type, standpipe pressure, wellhead back pressure and throttle valve opening etc., the aperture of choke valve is regulated to carry out Stress control, ensure that the continuity of controlled pressure drilling operation, reduce the possibility that down-hole complex accident occurs,
2, the utility model adopts swivel control head, hydraulic control flap type and hydraulic-control throttling valve conbined usage, decreases the complexity of controlled pressure drilling equipment, reduces the difficulty of wellfield layout, reduces high pressure pipe joint length, increases the safety of equipment operating;
3, the gas-liquid Ore-controlling Role of swivel control head, hydraulic control flap type and hydraulic-control throttling valve is united by the utility model, simplifies the control system of controlled pressure drilling equipment, is convenient to safeguard, easy to operate;
4, wellbore construction technological process is clearly three typical conditions by the utility model, gives the control resolving ideas of three kinds of operating modes, ensure that carrying out smoothly of wellbore construction;
5, this device has Gas-liquid pump, when oil sources supply goes wrong, Gas-liquid pump type of drive can be adopted to provide oil sources hydraulic pressure, ensure that the normal work of equipment when oil sources undersupply;
6 devices are provided with manual protecting, and when adopting Non-follow control, the malfunctioning situation of the Non-follow control that can prevent maloperation from causing occurs.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the utility model better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide further understanding of the present utility model, form a part of the present utility model, schematic description and description of the present utility model, for explaining the utility model, does not form improper restriction of the present utility model, wherein:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is on-the-spot application structure schematic diagram of the present utility model;
Fig. 3 is WorkFlow Managerment schematic diagram.
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
Obviously, those skilled in the art belong to protection domain of the present utility model based on the many modifications and variations that aim of the present utility model is done.
Embodiment 1: as shown in Figure 1, a kind of pressure control device for controlled pressure drilling, rotating blowout preventer 1 Bonding pressure meter 2, hydraulic control flap type 3, hydraulic control flap type 3 connects hydraulic control choke valve 4, hydraulic control flap type 3 is by hydraulic control flap type oil inlet pipe 24, hydraulic control flap type flowline 25 connecting fluid pneumatic control platform 5, hydraulic-control throttling valve 4 is by hydraulic-control throttling valve feed line 26, hydraulic-control throttling valve flow line 27 connecting fluid pneumatic control platform 5, rotating blowout preventer 1 is by rotating blowout preventer feed line 22, rotating blowout preventer flow line 23 connecting fluid pneumatic control platform 5, hydraulic-pneumatic control platform 5 connects oil sources pipeline 28, flow line 29, source gas line 30 and Long-distance Control netting twine 31,
Hydraulic-pneumatic control platform 5 connects bleed pressure table 6, oil supply pressure table 7, wellhead back pressure table 8, first explosion-proof display panels 9, second explosion-proof display panels 10, gas source switch 11, oil sources switch 12, rotating blowout preventer releases the button 13, rotating blowout preventer X button 14, Gas-liquid pump releases the button 15, Gas-liquid pump X button 16, hydraulic control flap type releases the button 17, hydraulic control flap type X button 18, regulating handle 19, manual/auto changeover switch 20 and manually protection button 21, the described instrument that hydraulic-pneumatic control platform 5 connects, switch, button and handle are connected with corresponding pipeline or parts separately.
Embodiment 2: as shown in Figure 1, Figure 2, Figure 3 shows,
For a Novel wellhead compress control method for controlled pressure drilling, control swivel control head, the switch of hydraulic control flap type and the aperture of choke valve by automatic control system or hand held console, thus control well mouth pressure, reach the object of gate ring governor pressure.Automatic control and manual control system are completely independent, by the conversion that source of the gas control realization is manual/auto; Under normal circumstances, the throttling being carried out swivel control head switch and choke valve by automatic control system is controlled, the operation of choke valve at various drilling condition is realized according to the self-choke control flow formulated, when automatically controlling to lose efficacy, open manual/automatic selector switch, be switched to manual control system, manually console controls the switch of swivel control head and the aperture of choke valve, regulate the duty of swivel control head and the back pressure of well head, to reach the object of control well bottom pressure; Swivel control head, hydraulic control flap type and hydraulic-control throttling valve conbined usage; Between swivel control head and hydraulic-control throttling valve, install a pressure sensor, pressure sensor is used for real-time measuring well mouth pressure value; Swivel control head and hydraulic-control throttling valve adopt unified gas, hydraulic control system; The power source of hydraulic control system is oil sources or source of the gas, and oil sources is mainly used in the control of swivel control head and hydraulic-control throttling valve; Source of the gas is mainly used in, when losing efficacy appears in oil sources, driving Gas-liquid pump to drive hydraulic oil, substitute oil sources and provide oil pressure for the control of swivel control head and hydraulic-control throttling valve by source of the gas; Manual control system and automatic control system can realize mutual conversion, manual control system and automatic control system separate.Hydraulic control platform arranges a manual/auto conversion master switch, and is provided with mechanical caging function, in order to avoid maloperation;
This device can realize the automatic control of well control pressure, the drilling condition technical process control such as can realize normally creeping under controlled pressure drilling mode condition, make up a joint, make a trip.
Embodiment 3:
As shown in Figure 1, for overall system structure of the present utility model, a kind of for the Novel wellhead compress control method of controlled pressure drilling and the core of device, be made up of executing agency and controlling organization two parts, executing agency comprises: rotating blowout preventer, hydraulic control flap type, hydraulic-control throttling valve, casing pressure table form; Controlling organization is hydraulic-pneumatic control platform.
First open oil sources switch 12, observe oil supply pressure table 7 pressure show value and whether reach 10.5MPa rated operating pressure, if lower than 10.5MPa, check that hydraulic fluid pipeline can have leakage, queueing problem makes hydraulic fluid pressure reach rated operating pressure.Hydraulic control flap type 3 is opened, closes swivel control head 1, gather the numerical value of pressure gauge 2, regulate hydraulic control choke valve 4 aperture, the force value after making the ring governor pressure after throttling reach setting.
When oil sources supply goes wrong, gas source switch valve 11 is opened, and it is 0.7-0.9MPa that bleed pressure table 6 shows bleed pressure, Gas-liquid pump is released the button and 15 to be opened, and after oil supply pressure table 7 reaches 10.5MPa, device normally works, oil supply pressure is controlled by console internal pressure air feeding apparatus, automatically supplements.
When system controls malfunctioning automatically, manual/auto switch 20 is adjusted to manual mode, and presses manually protection button 21, observe wellhead back pressure table 8, adjustment regulating handle 19, regulate hydraulic control choke valve 4 aperture, control wellhead back pressure; Wellhead back pressure table 8 and explosion-proof display panels 9,10 is observed in control procedure, wellhead back pressure table 8 shows wellhead back pressure value, explosion-proof liquid crystal panel 9 shows the parameters such as standpipe pressure, rate of discharge, down-hole PWD numerical value, and explosion-proof liquid crystal panel 10 shows the aperture of hydraulic-control throttling valve 4.
As shown in Figure 2, the utility model is connected to drilling team's wellhead assembly topmost, and rotating blowout preventer 1 is connected with universal blowout preventer, and hydraulic-control throttling valve 4 port of export is connected with drilling team slurry tank 32.
As shown in Figure 3, automatic control flow chart of the present utility model comprise normally creep into, make up a joint, the automatic control of three typical conditions such as to make a trip, that is: normal drilling control flow process 2-1, make up a joint process control flow 2-2 and the control flow 2-3 that makes a trip.
Normal drilling control flow process 2-1, normally creeping in flow process, first swivel control head 1 is set to closed condition, open hydraulic control flap type 3, regulate the aperture of hydraulic control choke valve 4, and Real-time Collection pressure sensor 2 parameter and down-hole PWD parameter, can closed-loop control wellhead back pressure value, make it reach the predetermined well head pressure value of auto-control software.
Make up a joint process control flow 2-2, in this technological process, first drilling team's kill manifold is opened, open the slush pump 33 connecting kill manifold, gather pressure sensor 2 parameter, regulate hydraulic control choke valve 4 aperture, well head pressure is made to follow well head pressure during normal drilling process identical, then close the slush pump 34 used when normally creeping into and carry out making up a joint operation, regulate hydraulic control choke valve 4 aperture, adjustment wellhead back pressure, makes it equal throttling back pressure when normally working and circulation frictional resistance sum, thus keeps bottom pressure stable.
Make a trip process control flow 2-3, open drilling team's kill manifold, open the slush pump 33 connecting kill manifold, regulate hydraulic control choke valve 4 aperture, well head pressure is made to follow well head pressure during normal drilling process identical, then close the slush pump 34 used when normally creeping into, regulate hydraulic control choke valve 4 aperture, adjustment wellhead back pressure, compensation cycle frictional resistance, then carry out round trip, gather the parameters such as speed, drilling fluid displacement that make a trip, regulate choke valve 4 aperture, adjustment wellhead back pressure, compensates the surge pressure caused owing to making a trip, and keeps bottom pressure to stablize.
As mentioned above, embodiment of the present utility model is explained, but as long as do not depart from invention of the present utility model in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection domain of the present utility model.
Claims (9)
1. the pressure control device for controlled pressure drilling, it is characterized in that, rotating blowout preventer Bonding pressure meter, hydraulic control flap type, hydraulic control flap type connects hydraulic control choke valve, hydraulic control flap type is by hydraulic control flap type oil inlet pipe, hydraulic control flap type flowline connecting fluid pneumatic control platform, hydraulic-control throttling valve is by hydraulic-control throttling valve feed line, hydraulic-control throttling valve flow line connecting fluid pneumatic control platform, rotating blowout preventer is by rotating blowout preventer feed line, rotating blowout preventer flow line connecting fluid pneumatic control platform, hydraulic-pneumatic control platform connects oil sources pipeline, flow line, source gas line and Long-distance Control netting twine, hydraulic-pneumatic control platform connects bleed pressure table, oil supply pressure table, wellhead back pressure table, the first explosion-proof display panels, the second explosion-proof display panels, gas source switch, oil sources switch, rotating blowout preventer is released the button, rotating blowout preventer X button, Gas-liquid pump are released the button, Gas-liquid pump X button, hydraulic control flap type are released the button, hydraulic control flap type X button, regulating handle, manual/auto changeover switch and manually protect button.
2. for a pressure control device for controlled pressure drilling, it is characterized in that, described pressure control device comprises executing agency and controlling organization, wherein,
Described executing agency comprises the rotating blowout preventer (1), hydraulic control flap type (3) and the hydraulic-control throttling valve (4) that are communicated with successively;
Described rotating blowout preventer (1) comprises the rotating blowout preventer feed line (22) and rotating blowout preventer flow line (23) that are connected with described controlling organization respectively, and described controlling organization controls the opening and closing of described rotating blowout preventer (1);
Described hydraulic control flap type (3) comprises the hydraulic control flap type oil inlet pipe (24) and hydraulic control flap type flowline (25) that are connected with described controlling organization, and described controlling organization controls the aperture of described hydraulic control flap type (3);
Described hydraulic-control throttling valve (4) comprises the hydraulic-control throttling valve oil inlet pipe (26) and hydraulic-control throttling valve flowline (27) that are connected with described controlling organization, and described controlling organization controls the aperture of described hydraulic-control throttling valve.
3. the pressure control device for controlled pressure drilling according to claim 2, it is characterized in that, described executing agency also comprises pressure gauge (2), and described pressure gauge (2) is arranged on the connecting line between described rotating blowout preventer (1) and described hydraulic control flap type (3).
4. the pressure control device for controlled pressure drilling according to claim 2, is characterized in that, described controlling organization has the oil-in connecting oil sources pipeline (28) and the oil-out connecting flow line (29).
5. the pressure control device for controlled pressure drilling according to claim 4, it is characterized in that, described controlling organization has automatic control part and Non-follow control portion, can conversion and control function mutually between described automatic control part and described Non-follow control portion, described controlling organization comprises oil supply pressure table (7) for detecting oil sources and the wellhead back pressure table (8) for the well head pressure that detects drilling well.
6. the pressure control device for controlled pressure drilling according to claim 5, is characterized in that, described controlling organization also has the gas source interface for connecting source gas line (30).
7. the pressure control device for controlled pressure drilling according to claim 6, is characterized in that, described controlling organization is provided with the bleed pressure table (6) for detecting the bleed pressure in described source gas line (30).
8. the pressure control device for controlled pressure drilling according to claim 5, is characterized in that, described controlling organization manually/automatic change-over (20) changes described automatic control part and described Non-follow control portion.
9. the pressure control device for controlled pressure drilling according to claim 2, is characterized in that, described controlling organization also has the first explosion-proof display panels (9) and the second explosion-proof display panels (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520279274.9U CN204804725U (en) | 2014-05-14 | 2015-05-01 | A well head pressure control device for controlling press well drilling |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246716 | 2014-05-14 | ||
| CN201520279274.9U CN204804725U (en) | 2014-05-14 | 2015-05-01 | A well head pressure control device for controlling press well drilling |
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| Publication Number | Publication Date |
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| CN204804725U true CN204804725U (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520279274.9U Expired - Fee Related CN204804725U (en) | 2014-05-14 | 2015-05-01 | A well head pressure control device for controlling press well drilling |
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| CN (1) | CN204804725U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105089528A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气集团公司 | Wellhead pressure control method and device for pressure control drilling well |
| CN105971536A (en) * | 2016-06-30 | 2016-09-28 | 中国石油集团西部钻探工程有限公司 | Pressure control device for whole-process underbalanced drilling and use method |
-
2015
- 2015-05-01 CN CN201520279274.9U patent/CN204804725U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105089528A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气集团公司 | Wellhead pressure control method and device for pressure control drilling well |
| CN105089528B (en) * | 2014-05-14 | 2018-10-16 | 中国石油天然气集团公司 | A kind of well head pressure control method and device for controlled pressure drilling |
| CN105971536A (en) * | 2016-06-30 | 2016-09-28 | 中国石油集团西部钻探工程有限公司 | Pressure control device for whole-process underbalanced drilling and use method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 |