CN210660036U - Safety operation system for inert gas pumping wellhead combustible gas - Google Patents
Safety operation system for inert gas pumping wellhead combustible gas Download PDFInfo
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- CN210660036U CN210660036U CN201921438151.XU CN201921438151U CN210660036U CN 210660036 U CN210660036 U CN 210660036U CN 201921438151 U CN201921438151 U CN 201921438151U CN 210660036 U CN210660036 U CN 210660036U
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Abstract
The utility model provides a safe operation system for sucking combustible gas at a well head by inert gas, which comprises a sand discharge pipeline, a first suction short circuit, an ignition device, a gas injection unit and a first gas injection manifold, wherein the first suction short circuit connects the well head with the sand discharge pipeline; the gas injection unit generates inert gas; the first gas injection manifold provides inert gas generated by the gas injection unit to the first suction short circuit so as to form negative pressure suction effect in the first suction short circuit; the ignition device is arranged at the outlet end of the sand discharge pipeline and can ignite the combustible gas discharged from the sand discharge pipeline. The utility model discloses can realize binary channels suction, notes nitrogen gas suction method that the gas injection can be regulated and control, eliminate and go on under the stratum a small amount of natural gas condition "take off the drilling, change the safety risk that the natural gas spills over the well head when the open-hole operation such as rubber core" is showing and promoting the site operation security, do benefit to gas drilling speed-raising advantage and exert.
Description
Technical Field
The utility model relates to a drilling (probing) engineering technical equipment field, particularly, relate to an adopt inert gas (for example, nitrogen gas) to pump well head combustible gas's safe operating system, mainly can be used to oil and gas well drilling technical field.
Background
Generally, the gas drilling technology has the advantages of accelerating, controlling leakage, protecting a reservoir and the like, is widely applied to oil and gas blocks such as Chongqing, Xinjiang, Qinghai and the like in recent years, and can accelerate the speed by more than 3 times compared with the conventional drilling technology. The gas-containing layer section with poor drilling performance is accelerated more and more commonly by adopting gas drilling, and once a small amount of natural gas (less than or equal to 10000 m) is drilled in the stratum3D) converting the circulating medium into inert gas nitrogen to avoid the occurrence of downhole explosion accidents, butOften because of lacking annular preventer, drilling tool size is big can't pass through reasons such as rotation control head assembly, when the open-hole operation such as tripping, changing rubber core, there is the natural gas and probably spills over the well head, has brought great potential safety hazard.
① belongs to passive control measures, natural gas overflow from the well mouth cannot be fundamentally prevented, natural gas which possibly overflows can be blown off only by the exhaust fan, ② has great potential safety hazard, especially knocking operation, because field operation safety cannot be ensured, when a small amount of natural gas is drilled (less than or equal to 10000 m), ③ meets the condition that the ground layer meets the requirements of safe field operation3And/d), the gas drilling operation is often forced to be terminated early, which is not favorable for the speed-up advantage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve at least one of the above-mentioned not enough of prior art existence. For example, it is an object of the present invention to provide a device that can safely process combustible gas formed by oil and gas drilling or well head drilling. The utility model discloses a safe difficult problem when another aim at solves the stratum and goes out under the small amount of natural gas condition gas drilling open well operation to improve the gas-bearing interval gas drilling open well operation security, prolong gas drilling footage, thereby do benefit to gas drilling speed-raising advantage performance, even fill the blank of gas drilling open well operation safety process measure when the stratum goes out a small amount of natural gas.
In order to achieve the above object, the present invention provides a safe operation system for sucking combustible gas at a wellhead by inert gas, the safe operation system comprises a sand discharge pipeline, a first suction short circuit, an ignition device, a gas injection unit and a first gas injection manifold, wherein the first suction short circuit connects the wellhead with the sand discharge pipeline; the gas injection unit generates inert gas; the first gas injection manifold provides inert gas generated by the gas injection unit to the first suction short circuit to form negative pressure suction effect in the first suction short circuit; the ignition device is arranged at the outlet end of the sand discharge pipeline and can ignite the combustible gas discharged from the sand discharge pipeline.
In an exemplary embodiment of the present invention, the safety operation system may further include a second suction short circuit and a second gas injection manifold, the second suction short circuit being disposed at a turn of the sand discharge pipeline; the second gas injection manifold provides inert gas generated by the gas injection unit to the second suction sub to create a negative pressure suction effect in the second suction sub.
In an exemplary embodiment of the present invention, the safety operation system may further include a third gas injection manifold and a supercharger, wherein the gas inlet end of the supercharger is connected to the gas injection unit through a valve, the third gas injection manifold communicates the gas outlet end of the supercharger with the well head, and the third gas injection manifold can withstand a predetermined high pressure. In addition, the safety work system may further include a low pressure gate valve group disposed between the gas injection unit and the first, second, and third gas injection manifolds. In addition, the safety operation system may further include a flow meter, a riser flat valve, and/or a pressure relief pry disposed on the third gas injection manifold.
In an exemplary embodiment of the present invention, the gas injection unit may include one or more than two sets of nitrogen generation units. In addition, the nitrogen generation unit can be composed of one or more than two membrane nitrogen generation units and one or more than two air compressors.
Compared with the prior art, the beneficial effects of the utility model include one or more in following content:
(1) a suction short joint is additionally arranged at a specific position of a sand discharge pipeline, a certain amount of nitrogen is injected into the sand discharge pipeline, the nitrogen flows at a high speed in the sand discharge pipeline, a certain suction force is generated at a wellhead position, and natural gas in a shaft is sucked and guided into the sand discharge pipeline to be prevented from overflowing the wellhead;
(2) the two additional suction short circuits are respectively arranged at the outlet position on the side of the wellhead rotation control head and the Z-shaped landing tee joint position of the sand discharge pipeline in the well site;
(3) optimizing and improving the structure and the connection mode of a gas injection unit, introducing a low-pressure gate valve group, and realizing switching of nitrogen injection modes under different working conditions and independent regulation and control of nitrogen injection amount at different suction short-circuit positions by controlling a gate valve of the low-pressure gate valve group;
(4) arranging an automatic ignition device at the outlet of the sand discharge pipeline, and igniting, burning and exhausting the natural gas sucked to the outlet of the sand discharge pipeline;
(5) the method provides a safe operation method for open-hole operations such as tripping and replacing rubber cores under the condition of a small amount of natural gas produced from the stratum, eliminates the safety risk possibly caused by the overflow of the natural gas of a shaft from a well mouth, improves the safety of gas drilling operation in a gas-containing layer section, and is more beneficial to the speed-increasing advantage of gas drilling.
Drawings
Fig. 1 shows a schematic diagram of an exemplary embodiment of a safe operating system for inert gas pumping of combustible gas at a wellhead according to the present invention.
Description of reference numerals:
1. the rotary control head, 2, a wellhead blowout preventer stack, 3, a first nitrogen production unit, 4, a second nitrogen production unit, 5, a booster unit, 6, a low-pressure gate valve group, 7, a pressure relief pry body, 8, a flowmeter, 9, a wellhead hydraulic flat valve, 10, a # 1 suction short circuit, 11, a # 2 suction short circuit, 12, a riser flat valve, 13, a low-pressure gas injection pipeline, 14, a high-pressure gas injection pipeline, 15, a # 1 suction pipeline, 16, a # 2 suction pipeline, 17, a well site internal sand discharge pipeline, 18, a well site external sand discharge pipeline, 19 and an automatic ignition device.
Detailed Description
Hereinafter, the safe operation system of the inert gas pumping wellhead combustible gas of the present invention will be described in detail with reference to the exemplary embodiments.
In an exemplary embodiment of the present invention, the safety operation system for inert gas pumping of combustible gas at the wellhead may include a sand discharge pipeline, a first pumping sub, an ignition device, a gas injection unit, and a first gas injection manifold.
The first suction sub can connect the wellhead directly or indirectly with the sand discharge line. In particular, the upstream end of the first suction sub may be connected directly or indirectly to the wellhead and the downstream end of the first suction sub may be connected to the sand discharge line. For example, the upstream end of the first suction short may be connected to a rotating control head of the wellhead through a wellhead hydraulic flapper valve. However, the present invention is not limited thereto. In addition, the first suction sub may be provided with one or more axially inclined orifices communicating with the first gas injection manifold to generate a jet flow inclined from the axial direction to create a negative pressure suction effect. The axial direction refers to the direction along the centre axis of the first suction short. The upstream and downstream ends of the first suction short are with respect to a direction of fluid flow flowing in the axial direction.
The gas injection unit is used to generate an inert gas (e.g., nitrogen). For example, the gas injection unit can act as an inert gas source. The gas injection unit may include one or more than two sets of nitrogen generation units. The nitrogen production unit can be composed of one or more than two membrane nitrogen production units and one or more than two air compressors. However, the present invention is not limited thereto, and other devices capable of forming an inert gas are also possible.
The first gas injection manifold is capable of providing inert gas generated by the gas injection unit to the first suction sub to create a negative pressure suction effect in the first suction sub. For example, the first gas injection manifold may provide an inert gas to the one or more axially-angled orifices of the first suction sub to create a jet of gas that is angled from the axial direction to create a negative pressure suction in the inner peripheral wall of the first suction sub to create a good suction of the combustible gas-containing fluid at the well bore connected to the first suction sub.
The ignition device may be disposed at an outlet end of the sand drain line and may be capable of igniting the combustible gas discharged from the sand drain line. The ignition device may be an automatic or remote ignition device to further improve operational safety.
In another exemplary embodiment of the present invention, the safety operation system for pumping combustible gas from the wellhead by using inert gas may further include a second pumping sub and a second gas injection manifold based on the structure of the above exemplary embodiment.
The second suction short may be arranged at a turn of the sand discharge line, e.g. a right angle turn. The second suction sub can connect two pipe bodies of the sand discharge pipeline, which are adjacent to each other at the turn, and can form negative pressure suction effect on the turn. Specifically, the upstream end of the second suction sub may be connected to a bend and the downstream end of the second suction sub may be connected to a subsequent tube. However, the present invention is not limited thereto. In addition, the second suction sub can be provided with one or more axially inclined orifices, and the one or more axially inclined orifices are communicated with the gas injection unit through the second gas injection manifold so as to generate jet gas flow inclined with the axial direction, thereby forming negative pressure suction effect. Axial here means the direction along the centre axis of the second suction short. The upstream and downstream ends of the second suction sub are with respect to a direction of fluid flow along an axial direction of the second suction sub.
The second gas injection manifold may provide inert gas generated by the gas injection unit to the second suction sub to create a negative pressure suction effect in the second suction sub. For example, the second gas injection manifold may provide inert gas to one or more axially-angled orifices of the second suction sub to create an axially-angled jet flow with the second suction sub to create a negative pressure suction in an inner peripheral wall of the second suction sub to create a good suction of solids (e.g., sand), gas, liquid, or mixed phases at the turn of the sand discharge line where the second suction sub is connected.
In another exemplary embodiment of the present invention, the safety operation system for pumping combustible gas from the wellhead by using inert gas may further include a third gas injection manifold and a booster based on the mechanism according to any one of the above exemplary embodiments.
The air inlet end of the supercharger is connected with the air injection unit through a valve, and the supercharger can increase inert gas from the air injection unit. The number of the superchargers may be one or two or more. The third gas injection manifold communicates the gas outlet end of the booster with the wellhead so as to provide the pressurized inert gas to the wellhead. The high-pressure inert gas (e.g., nitrogen) can be supplied to the wellhead by providing the third gas injection manifold and the booster, so that the safety operation system of the inert gas suction wellhead combustible gas of the present exemplary embodiment can be provided with the high-pressure nitrogen required for the nitrogen drilling operation. The third gas injection manifold is capable of withstanding a predetermined high pressure. The high pressure range may be determined based on field conditions. For example, a specific pressure range of the high pressure may be not less than 21 MPa. In addition, in the present exemplary embodiment, one or more of a flow meter, a riser flat valve, a pressure relief pry, and the like may also be provided on the third gas injection manifold to facilitate flow sensing and switching, pressure relief operations.
Further, in this exemplary embodiment, the safety operating system may further include a low pressure gate valve set disposed between the gas injection unit and the first, second, and third gas injection manifolds, thereby facilitating independent gas supply to one or more of the first, second, and third gas injection manifolds through the gas injection unit.
Fig. 1 shows a schematic diagram of an exemplary embodiment of a safe operating system for inert gas pumping of combustible gas at a wellhead according to the present invention.
As shown in fig. 1, in an exemplary embodiment of the present invention, a safe operation system for inert gas pumping of combustible gas at a wellhead may include: gas injection unit, gas injection manifold, sand discharge pipeline, suction short circuit and automatic ignition device.
The gas injection unit comprises a first nitrogen production unit 3, a second nitrogen production unit 4 and a booster set 5. The first nitrogen production unit 3 consists of 4 air compressors and 1 membrane nitrogen production unit, the rest air compressors and the membrane nitrogen production unit form a second nitrogen production unit 4, and the two nitrogen production units pass through
The hoses are connected to the low-pressure gate valve group 6 in parallel, three outlet ends of the low-pressure gate valve group 6 are respectively connected with the 1# suction pipeline 10, the 2# suction pipeline 11 and the booster set 5 air inlet low-pressure hose, and the channels are switched through the low-pressure gate valve group 6 to meet the requirements of nitrogen gas under different working conditionsThe injection mode is changed.
The gas injection manifold comprises a low-pressure gas injection manifold 13, a high-pressure gas injection pipeline 14, a low-pressure gate valve group 6, a 1# suction pipeline 15, a 2# suction pipeline 16, a pressure relief pry body 7 and a flowmeter 8. The low-pressure gas injection manifold 13 is used for connecting an air compressor in series, producing nitrogen to the low-pressure gate valve set 6 through a membrane, and connecting the low-pressure gate valve set 6 to the inlet of the booster set 5
A hose. The high-pressure gas injection pipeline 14 is used for connecting the high-pressure outlet end of the booster unit 5 to the vertical pipe flat valve 12
The steel pipeline connects the pressure relief pry 7 and the flowmeter 8 in series on the high-pressure gas injection pipeline 14. The 1# suction line 15 is adopted from the port of the 6-Z1# gate valve of the low-pressure gate valve group
The hose is connected to the # 1 suction pup joint 10; the 2# suction line 16 is adopted from the port of the 6-Z2# gate valve of the low-pressure gate valve group
The hose is connected to # 2 suction sub 11.
The rotary control head 1 can be installed at the top of a wellhead blowout preventer group 2 by adopting M42 bolt flange connection, a wellhead hydraulic flat valve 9, a No. 1 suction short joint 10 and a well site internal sand discharge pipeline 17 are sequentially connected from an outlet at the side of the rotary control head 1, and the well site internal sand discharge pipeline 17 is in drift diameter
The pressure level is 7MPa, and the flange connection is realized; after the sand is directly discharged to a well site, the tee joint turns and falls to the ground, the sand is sequentially connected with a No. 2 suction short joint 11, a sampling short joint and a dust falling short joint and then reaches a sand setting pool, and the drift diameter of a sand discharge pipeline 18 outside the well site
4MPa in pressure level and connected by a clamp.
The automatic electronic ignition device 11 is arranged at the outlet of the well site external sand discharge pipeline 18, and the ignition, combustion and discharge of the sucked natural gas are realized by remotely controlling an ignition switch.
The use case of the present exemplary embodiment is explained below with reference to fig. 1.
Under the condition of a small amount of natural gas produced from stratum (less than or equal to 10000 m)3And d), during nitrogen drilling operation, closing Z1#, Z2#, C1#, C2# flat valves, opening Z3#, Z4#, and Z5# flat valves, enabling nitrogen jointly produced by the first nitrogen production unit 3 and the second nitrogen production unit 4 to enter the booster set 5 from the port of the Z3# flat valve through the low-pressure gate valve group 6, and enabling the nitrogen to enter a vertical pipe through the high-pressure gas injection pipeline 14 after being boosted, so that the nitrogen amount required by the nitrogen drilling operation is met.
Under the condition of a small amount of natural gas produced from stratum (less than or equal to 10000 m)3And d), when tripping operation is carried out during nitrogen drilling, and the rotary control head 1 assembly is not taken out, the well mouth is sealed, a small amount of natural gas produced by the stratum gradually invades into the shaft, and the natural gas overflowing from the shaft enters a sand discharge pipeline to be combusted and exhausted; and (3) taking out the rotary control head 1 assembly, opening a wellhead, implementing a nitrogen pumping method, ensuring that the natural gas in the shaft is pumped and guided to a sand discharge pipeline to be combusted and emptied, opening Z1#, Z2#, C1#, C2# flat valves, closing Z3#, Z4#, and Z5# flat valves, opening the first nitrogen making unit 3 and the second nitrogen making unit 4 to inject nitrogen for pumping into the 1# pumping short circuit 10 and the 2# pumping short circuit 11 respectively, and regulating and controlling the amount of the injected nitrogen at different pumping short circuits according to actual conditions to ensure that no natural gas overflows from the wellhead. For example, the nitrogen amount of the 1# suction short circuit 10 can be 45-75 m3Min; the nitrogen amount of the 2# suction short circuit 11 can be 15-45 m3/min。
Under the condition of a small amount of natural gas produced from stratum (less than or equal to 10000 m)3And d), when rubber core replacing operation is carried out during nitrogen drilling, nitrogen injection into the vertical pipe is stopped, nitrogen is exhausted through the pressure relief pry body 7, the nitrogen discharge capacity is adjusted to meet the pumping requirement, a pumping channel is established, the Z1#, the Z2#, the C1#, the C2# flat valves are opened firstly, and then the Z3#, the Z4# and the Z5# flat valves are closed, natural gas in the shaft is pumped to the sand discharge pipeline for combustion and evacuation, no natural gas overflows from the well mouth in the whole rubber core replacing operation process, and construction safety is ensured.
To sum up, the utility model discloses a safe operation device of inert gas suction well head combustible gas has following characteristics:
(1) the sand discharge pipeline is additionally provided with a suction short joint, nitrogen is injected into the sand discharge pipeline, and when the nitrogen flows towards the outlet direction of the sand discharge pipeline at a high speed, a certain suction force is generated at the position of a well mouth to suck and guide natural gas produced by a stratum into the sand discharge pipeline, so that the natural gas is prevented from overflowing the well mouth, and the safety of open-hole operations such as tripping and replacing a rubber core is improved;
(2) two suction short circuits are installed to ensure the suction effect, the suction short circuit No. 1 is installed at the position of an outlet near the rotary control head, the suction short circuit No. 2 is installed at the Z-shaped landing tee joint of the sand discharge pipeline in the well field, and the double suction short circuits greatly improve the suction force to ensure that the natural gas in the shaft is sucked and guided into the sand discharge pipeline and are beneficial to sand discharge;
(3) the split type gas injection manifold structure design is adopted, a low-pressure gate valve group is introduced, and the channel switching of the low-pressure gate valve group meets the requirements of nitrogen injection modes under different working conditions and the nitrogen injection quantity regulation and control of different suction short-circuit positions; decompose into two nitrogen units of system with nitrogen making equipment (for example, one of them nitrogen unit contains 4 air compressors and 1 membrane nitrogen making, remaining air compressor and membrane nitrogen making are as another nitrogen making unit), the nitrogen gas of two nitrogen making unit outputs connects in parallel to low pressure gate valves group, one of them port of low pressure gate valves group connects the low pressure hose and advances the booster compressor, two low pressure hoses to 1#, 2# suction short circuit are connected respectively to remaining two ports of low pressure gate valves group to can be according to different operating modes, switch low pressure gate valves group passageway and realize following function: the nitrogen quantity required by nitrogen drilling is provided during drilling, the nitrogen quantity required for pumping is provided during pumping, and the nitrogen quantity injected by different pumping short circuits can be regulated and controlled;
(4) the automatic ignition device is installed at the outlet of the sand discharge pipeline, and during nitrogen suction operation, natural gas sucked to the outlet of the sand discharge pipeline is ignited and combusted through the automatic ignition device, so that safe and clean discharge is realized.
Although the present invention has been described above in connection with exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (9)
1. A safety operation system for inert gas suction of combustible gas at a wellhead comprises a sand discharge pipeline and is characterized by further comprising a first suction short circuit, an ignition device, a gas injection unit and a first gas injection manifold, wherein the first suction short circuit connects the wellhead with the sand discharge pipeline; the gas injection unit generates inert gas; the first gas injection manifold provides inert gas generated by the gas injection unit to the first suction short circuit to form negative pressure suction effect in the first suction short circuit; the ignition device is arranged at the outlet end of the sand discharge pipeline and can ignite the combustible gas discharged from the sand discharge pipeline.
2. The system of claim 1, further comprising a second suction sub and a second gas injection manifold, the second suction sub disposed at a turn of a sand discharge line; the second gas injection manifold provides inert gas generated by the gas injection unit to the second suction sub to create a negative pressure suction effect in the second suction sub.
3. The system for safely operating inert gas pumped well head combustible gas according to claim 1 or 2, characterized in that the system for safely operating inert gas pumped well head combustible gas further comprises a third gas injection manifold and a booster, wherein the gas inlet end of the booster is connected with the gas injection unit through a valve, the third gas injection manifold communicates the gas outlet end of the booster with the well head, and the third gas injection manifold can endure a predetermined high pressure.
4. The inert gas extraction wellhead combustible gas safety operation system according to claim 3, further comprising a low pressure gate valve set disposed between the gas injection unit and the first, second and third gas injection manifolds.
5. The system of claim 3, further comprising a flow meter and a riser flat valve disposed on the third gas injection manifold.
6. The system of claim 3, further comprising a pressure relief skid disposed on the third gas injection manifold.
7. The system of claim 1, wherein the gas injection unit comprises one or more than two sets of nitrogen generation units.
8. The system of claim 7, wherein the nitrogen-producing unit comprises one or more than two membrane nitrogen-producing units and one or more than two air compressors.
9. The system of claim 1, wherein the first suction sub is connected to a rotary control head of the wellhead through a wellhead hydraulic flat valve.
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| CN201921438151.XU CN210660036U (en) | 2019-08-30 | 2019-08-30 | Safety operation system for inert gas pumping wellhead combustible gas |
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| CN201921438151.XU CN210660036U (en) | 2019-08-30 | 2019-08-30 | Safety operation system for inert gas pumping wellhead combustible gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796726A (en) * | 2021-02-03 | 2021-05-14 | 西南石油大学 | Underground blasting device and method for reservoir fracture expansion of coal-bed gas well |
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2019
- 2019-08-30 CN CN201921438151.XU patent/CN210660036U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796726A (en) * | 2021-02-03 | 2021-05-14 | 西南石油大学 | Underground blasting device and method for reservoir fracture expansion of coal-bed gas well |
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