CN210003235U - Modular high-temperature wellhead well control system for underground coal gasification process - Google Patents
Modular high-temperature wellhead well control system for underground coal gasification process Download PDFInfo
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- CN210003235U CN210003235U CN201920200184.4U CN201920200184U CN210003235U CN 210003235 U CN210003235 U CN 210003235U CN 201920200184 U CN201920200184 U CN 201920200184U CN 210003235 U CN210003235 U CN 210003235U
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Abstract
The utility model provides an modularization high temperature well head well control system for coal underground gasification technology (ISC), from the bottom up include the following part, the base plate, directly install in the pipe top, the casing head, whole sleeve pipe hangs a section of thick bamboo, including slot type dabber suspension, cement well cementation sleeve pipe monitoring system and locking mechanism multiport static tubular column hangs the cross, including hanging cross body, multiport dabber suspension shell, dabber suspension, gland, full internal diameter valve and locking mechanism multiport corrosion-resistant alloy (CRA) static tubular column hangs the cross, including hanging cross body, tubular column suspension, fluid auxiliary tubular column port, electron auxiliary tubular column port, multipurpose valve, terminal valve cross and locking mechanism flange adapter.
Description
Technical Field
The utility model provides an modularization high temperature well head well control system that is used for coal underground gasification technology (ISC), very much, the utility model provides a kind is used for the modularization high temperature well head well control system of high temperature product well in coal underground gasification technology, still provides the operation method of this kind of high temperature well head well control system in coal underground gasification technology, specifically can be used to the production process of coal underground gasification technology.
Background
Underground coal gasification (ISC) is a process of converting coal directly to product gas, commonly referred to as syngas, by combustion and gasification reactions in an underground coal seam in the presence of an oxidant, which can then be used as a feedstock for a variety of applications, including fuel production, chemical production, and power generation.
the wells are drilled underground or horizontally to form substantially horizontal well channels (also referred to as coal-seam wells or communication channels for short) that facilitate oxidant injection, fuel-void zone growth, and product gas transport wells for oxidant injection are referred to as "injection wells" and wells for product gas production are referred to as "product wells.
This configuration is referred to as underground coal gasification (ISC) units or well pairs when there are injection wells, product wells and horizontal channels in the coal seam connecting the two, the ISC unit includes a combustion zone, a gasification zone and a pyrolysis zone, wherein the combustion zone is near the point of oxidant injection in the coal seam, the gasification zone surrounds the combustion zone in a radial pattern or is downstream from the combustion zone where the coal is gasified and partially oxidized to produce product gas, the pyrolysis zone is downstream from the gasification zone where the pyrolysis reaction of the coal occurs, the high temperature product gas flows downstream from the gasification zone and is ultimately transported to the surface from the product well wellhead, and the ISC burnout area in the coal seam grows larger while the coal is being combusted or gasified.
The product gas (raw synthesis gas) produced by underground coal gasification usually contains synthesis gas (CO, CO)2，H2，CH4And other gases) and other constituents solid particles, water, coal tar, hydrocarbon vapors, other minor constituents including H2S，NH4COS, etc.). The compositional complexity depends on several aspects: the oxidant (air or other oxidant such as oxygen, oxygen-enriched air or steam mixture) used in the underground coal gasification, water inherent in the coal seam or water infiltrated into the coal seam from surrounding formations, the quality of the coal, and operating parameters of the underground coal gasification process, including temperature, pressure, etc.
According to the prior patent literature, the problems faced by the current underground coal gasification technology mainly include:
a) most underground coal gasification wellhead systems and associated well control equipment are typically constructed by modifying existing equipment on a coarse/basic basis to create a variety of different wellhead systems, making them very complex in design and operation.
b) Most underground coal gasification wellhead systems and associated well control equipment are highly customizable, resulting in long production periods and high production costs.
c) Most underground coal gasification wellhead systems only allow static sealing at the surface and downhole, which severely hampers the overall production efficiency of the gasifier, while increasing the chance of damage or rejection of the wellhead system due to thermal expansion/deformation.
d) Most underground coal gasification wellhead systems are only suitable for single string completion designs or, at most, dual string completion designs. This limits the flexibility of gasifier design, thereby impacting the commercial viability of the coal underground gasification process.
e) Most underground coal gasification wellhead systems are dedicated to only the exemplary project and are not used for ultimate commercial operations. For example, the existing standardized "section a", "section B", and "section C" wellhead stacking methods are employed. This makes the height (stack) of the entire wellhead system very high. At the same time, most or the entire wellhead system needs to adopt expensive corrosion-resistant alloy, which finally seriously increases the capital expenditure of the project and reduces the economic feasibility of the project.
SUMMERY OF THE UTILITY MODEL
To the prior art, the utility model provides an kind of modularization high temperature well head well control systems that are used for coal underground gasification technology still provides the operating method of this kind of modularization high temperature well head well control systems in coal underground gasification technology.
The utility model provides a technical scheme that its technical problem adopted is:
a modular high temperature wellhead well control system for coal underground gasification process, the modular high temperature wellhead well control system comprises the following components from bottom to top:
1. the base plate is used for improving the integrity of the modularized high-temperature wellhead well control system, is directly arranged above the guide pipe, and can improve the flexibility of the setting height of the surface casing pipe;
2. the casing head is used for connecting a surface casing in a high-temperature wellhead well control system;
3. the integral casing suspension cylinder is used for connecting and suspending a production casing in a high-temperature wellhead well control system and comprises a groove type mandrel suspension system, a cement well cementation casing monitoring system and a locking mechanism.
4. The multi-port static pipe column suspension four-way joint is used for connecting and suspending auxiliary pipe columns in a high-temperature wellhead well control system, realizes the concentric/eccentric suspension and crossing of or more fluid auxiliary pipe columns and/or electronic auxiliary pipe columns in a wellhead, and comprises a suspension four-way joint body, a multi-port mandrel suspension shell, a mandrel suspension, a sealing gland, a full-inner-diameter valve and a locking mechanism.
5. A multi-port corrosion-resistant alloy (CRA) static pipe column hanging four-way joint is used for connecting and hanging pipe columns in a high-temperature wellhead well control system and comprises a hanging four-way joint body, a pipe column hanging part, a fluid auxiliary pipe column port, an electronic auxiliary pipe column port, a multipurpose valve, a terminal valve four-way joint and a locking mechanism.
6. A flange adapter for connecting or more master valves and/or gas production trees at the uppermost end of the high temperature wellhead and well control train.
Wherein, modularization high temperature well head well control system is through changing static tubular column of multiport corrosion-resistant alloy (CRA) hangs the cross and can realize ground and the dynamic seal in pit for multiport corrosion-resistant alloy (CRA) developments tubular column, has avoided because thermal energy/deformation lead to the damage of well head system or condemned possibility, has improved the whole production of gasifier and has imitated. The multi-port corrosion-resistant alloy (CRA) dynamic pipe column hanging four-way joint comprises a hanging four-way joint body, a pipe column hanging part, a fluid auxiliary pipe column port, an electronic auxiliary pipe column port, a multipurpose valve, a terminal valve four-way joint and a locking mechanism.
Modularization high temperature well head well control system, multiport corrosion-resistant alloy (CRA) static tubular column hangs the cross or/and multiport corrosion-resistant alloy (CRA) dynamic tubular column hangs the inside tubular column of cross and hangs upper portion, and another tubular columns of joinable and installation hang for connect workover rig drilling rod or oil pipe, play out the tubular column and implement the workover operation.
Modularization high temperature well head well control system, the inside dabber that is used for supplementary tubular column that multiport static tubular column hangs the cross hangs and can move downwards below the earth's surface and increase second multiport dabber and hang the shell, realizes or many fluid auxiliary columns and/or the concentric/eccentric of electron auxiliary column in the casing string (below the earth's surface) and hangs and pass through, finally can compress effectively modularization high temperature well head well control system is at the part and the height on earth's surface, the implementation of the commercialization project of being convenient for.
The utility model discloses an operating method of modularization high temperature well head well control system, operating method is as follows:
1. installing a casing head and connecting a surface casing;
2. the base plate is directly connected to the guide pipe shell, the setting height of the surface casing pipe is adjusted, and surface casing pipe cement well cementation and related installation tests are implemented;
3. installing an integral casing hanging cylinder, hanging and connecting a production casing through a mandrel, fixing the position of the production casing through a locking mechanism, and implementing cement cementing of the production casing and related installation tests;
4. installing a multi-port static tubular column hanging four-way body and a groove type mandrel hanger;
5. installing a sealing gland and a multi-port mandrel suspension shell, and implementing pipe column and auxiliary pipe column lower pipe after fixing the multi-port mandrel suspension position through a locking bolt;
6. installing a mandrel hanger in the multi-port mandrel hanger shell to finish auxiliary tubular column hanging;
7. installing a multi-port corrosion-resistant alloy static tubular column suspension four-way body and a full-inner-diameter valve on a side hole;
8. connecting the auxiliary pipe column and the corresponding port and installing a multi-purpose valve/terminal valve four-way valve to complete the crossing of the auxiliary pipe column;
9. installing a pipe column suspension, and fixing the position of the pipe column through a locking mechanism;
10. the flange adapters are mounted and the associated mounting tests are performed.
11. The modularized high-temperature wellhead well control system is arranged on an injection well and used for injecting an oxidant through a pipe column or used as a channel of oxidant injection equipment
12. The modularized high-temperature wellhead well control system is arranged on a product well and outputs a synthesis gas product through a pipe column;
13. injecting a secondary production fluid, such as a coolant, catalyst, auxiliary feedstock, purge fluid, etc., through the fluid assist column;
14. real-time monitoring and controlling underground coal gasification process parameters and conditions through an electronic auxiliary pipe column;
15. and annular space channels among the pipe column, the auxiliary pipe column and the production casing are used as a pressure relief channel, an injection channel and a purging channel under abnormal operation conditions.
Wherein, in the operating method, if a dynamic seal terminal is adopted, the locking mechanism in step 9 is used for adjusting the maximum range of dynamic seal instead of fixing the position of the pipe column.
According to the utility model, when utilizing the modularization high temperature well head well control system carries out coal underground gasification process, and the technology operation is more nimble convenient to realize the continuous steady operation of coal underground gasification technology, the modular design reduces the economic cost and the time cost of project with showing, has brought the progress for prior art.
Drawings
FIG. 1 is a schematic diagram of modular high temperature wellheads with static seal terminations and associated well control systems.
FIG. 2 is a schematic diagram of the top of modular high temperature wellheads with dynamic seal termination and associated well control systems.
FIG. 3 is a schematic illustration of another modular high temperature wellheads with static seal terminations and associated well control systems.
FIG. 4 is a schematic illustration of another modular high temperature wellheads with static seal terminations and associated well control systems.
Like reference symbols in the various drawings indicate like elements. In particular, the reference numerals referred to in the various figures have the following meanings:
1, a substrate; 2, casing head; 3, an integral sleeve suspension cylinder; 4, a locking mechanism; 5, hanging a four-way joint by a multi-port static pipe column; 6, a full bore valve; 7, a multi-purpose valve/end valve cross; 8, a multi-port corrosion-resistant alloy (CRA) static pipe column hanging four-way joint; 9, a flange adapter; 10, hanging the pipe column; 11, a fluid auxiliary string port; 12, a terminal valve four-way/multi-purpose valve; 13, an electronic auxiliary column port; 14, a multi-port mandrel suspension housing; 15, an electronic auxiliary column; 16, a fluid assist string; 17, mandrel suspension; 18, a sealing gland; 19, hanging a groove type mandrel; 20, a pipe column; 21, a multi-port corrosion-resistant alloy (CRA) dynamic pipe column hanging four-way joint; 22, hanging the pipe string (repairing the well); 23, a second multi-port mandrel suspension housing; and 24, a cement cementing casing monitoring system.
Detailed Description
The following provides a detailed description of the technical solution of the present invention through an embodiment and with reference to the drawings.
A modular high temperature wellhead well control system for coal underground gasification process, the modular high temperature wellhead well control system comprises the following components from bottom to top:
1. the base plate for increase modularization high temperature well head well control system's integrality, the direct mount can improve the flexibility that the top layer sleeve pipe set up the height above the pipe.
2. And the casing head is used for connecting a surface casing in the high-temperature wellhead well control system.
3. The integral casing suspension cylinder is used for connecting and suspending a production casing in a high-temperature wellhead well control system and comprises a groove type mandrel suspension system, a cement well cementation casing monitoring system and a locking mechanism.
4. The multi-port static pipe column suspension four-way joint is used for connecting and suspending auxiliary pipe columns in a high-temperature wellhead well control system, realizes the concentric/eccentric suspension and crossing of or more fluid auxiliary pipe columns and/or electronic auxiliary pipe columns in a wellhead, and comprises a suspension four-way joint body, a multi-port mandrel suspension shell, a mandrel suspension, a sealing gland, a full-inner-diameter valve and a locking mechanism.
5. A multi-port corrosion-resistant alloy (CRA) static pipe column hanging four-way joint is used for connecting and hanging pipe columns in a high-temperature wellhead well control system and comprises a hanging four-way joint body, a pipe column hanging part, a fluid auxiliary pipe column port, an electronic auxiliary pipe column port, a multipurpose valve, a terminal valve four-way joint and a locking mechanism.
6. Flange adapter for connecting or more main valves and
and/or gas production trees.
Technical scheme of the utility model in the modularization high temperature well head well accuse isThe system is designed to meet the pressure requirements of all standard industrial and non-industrial regulatory agencies, 1,000 and 25,000 psi. The design temperature of the modularized high-temperature wellhead well control system can reach 350-500 ℃ at most. The materials selected for the modular high temperature wellhead well control system may be selected according to the oil and gas industry API specification corrosion grade, including but not limited to AA (suitable for substantially non-corrosive liquids or gases), BB (suitable for corrosion resistance of 13 cr stainless steel internals, also for slight corrosion of the internal surface), CC (suitable for any liquid or gaseous state meeting 13 cr stainless steel), DD (suitable for low temperature acid gases and oils, H-resistant)2Corrosion by S, in the presence of H2Other chemicals, products or hydrocarbons at S), EE (suitable for acid gases and oils, H-resistant2Corrosion by S, in the presence of H2Other chemicals, products or hydrocarbons at S), FF (suitable for use when CO is present)2Over H2Acid gases, oils, other chemicals, products, or hydrocarbons at S content) or combinations thereof. The design specification levels (PSLs) of the modular high temperature wellhead well control system include, but are not limited to, PSL-1, PSL-2, and PSL-3 that meet API specifications. The design dimensions of the modular high temperature wellhead well control system include, but are not limited to, 5-30 inches.
The technical scheme of the utility model the base plate for increase modularization high temperature well head well control system's integrality. In addition, the setting depth of the surface casing can be adjusted by adjusting the substrate according to policy and regulation requirements, geological conditions and project requirements.
The casing head of the present invention is generally threaded and connected to the surface casing , which may be threaded, welded or flanged, depending on the drilling and completion design requirements, or more integrated casing hang ports on the support to monitor potential gas migration through the cement casing string.
The utility model discloses an integral casing pipe hangs a section of thick bamboo among the technical scheme, be used for high temperature well head well control system in connect and hang the production sleeve pipe, including slot type dabber hangs, cement well cementation sleeve pipe monitoring system and locking mechanism, the slot type dabber casing hangs, be used for in the high temperature well head well control system static suspension production sleeve pipe.
The technical scheme of the utility model static tubular column of multiport hang the cross for connect in the high temperature well head well control system and hang auxiliary pipe post, realize or many fluid auxiliary pipe posts and/or the concentric/eccentric of electron auxiliary pipe post in the well head and hang and pass through, hang shell, dabber including hanging cross body, multiport dabber and hang, seal gland, slot type dabber and hang, full internal diameter valve and locking mechanism.
Wherein the fluid auxiliary column and/or the electronic auxiliary column are statically suspended in the suspension cross body. The auxiliary string includes a single tubing string, a concentric tubing string, a production string, a casing, a reverse circulation string, an instrumentation string (temperature monitoring, pressure monitoring, acoustic monitoring, gas analysis, or combinations thereof), and the like. If wellbore geological conditions require the string to be in compression or tension, the design allows the mandrel suspension to be changed to a slider type suspension. And the four-way pipe is suspended through the multi-port static pipe column, so that a concentric or eccentric completion structure of an internal auxiliary pipe column is realized.
Multiport dabber hangs shell, and high temperature well head is not holistic, but it is in the utility model discloses a multiple function has among the modularization high temperature well head well control system function has realized hanging a plurality of tubular columns in the well, the second function has been realized hanging the production string in the top of auxiliary tubular column, obtains the annular space passageway between production sleeve pipe and the production tubular column, at installation (storehouse) during other section (top) of high temperature well head well control system, the accessible multiport dabber hangs the shell and temporarily keeps earlier/hangs the position of production tubular column, the third function has been realized through changing the top structure of high temperature well head well control system obtains ground and the dynamic seal ability in the pit.
The multi-port mandrel suspension housing may be mounted in a single or multiple pieces and may be ported to the multi-port valve/terminal valve cross-piece at specific locations on the multi-port mandrel suspension housing to form entirely new modules.
The dabber hangs, can realize the completion is implemented to high temperature well head well control system's essential part top to it is right in multiport dabber hangs the shell to realize the auxiliary string carries out static and/or dynamic hanging. The circulation passage below the auxiliary pipe column mandrel suspension is isolated by adopting a metal-metal sealing element or low-cost graphite sealing, so that the stacking height and cost of a wellhead system in the prior art are effectively reduced, and the safety and the economical efficiency are improved. Meanwhile, single or multiple spindle suspensions can be installed according to project process requirements, and concentric and/or eccentric suspension arrangement is achieved. Adopt the dabber hangs, allows to carry out independent measurement and mark to every auxiliary pipe post before hanging auxiliary pipe post, has reduced misoperation's possibility, has increased accuracy and security among the engineering implementation process.
Gland for keep apart multiport dabber hangs shell and slot type dabber and hangs and the well completion well head hypomere through adopting gland can establish independent circulation routes, avoids corrosive gas and/or liquid contact casing head hangs a section of thick bamboo with whole sleeve pipe, allows the well head hypomere to adopt the carbon steel, reduces the cost of whole project.
Full internal diameter valve is connected the static tubular column of multiport hangs the side opening of cross, and the annular space passageway between intercommunication production sleeve pipe and tubular column, the auxiliary pipe post for production/unloading and/or sweep/pour into. The full bore valve is 113/16-135/8 inches in size and can be used for production operations and well control operations.
The utility model discloses a static tubular column of multiport corrosion-resistant alloy (CRA) among the technical scheme hangs the cross for high temperature well head well control system internal connection and hang the tubular column, hang, fluid auxiliary pipe post port, electron auxiliary pipe post port, multipurpose valve, terminal valve cross and locking mechanism including hanging cross body, tubular column.
The pipe column is hung statically in the hanging four-way body through the pipe column. The tubular columns comprise a single oil pipe tubular column, a concentric oil pipe tubular column, a production tubular column, a sleeve, a reverse circulation tubular column, an instrument tubular column and the like. If wellbore geological conditions require the string to be in compression or tension, the design allows the mandrel suspension to be changed to a slider type suspension. And the four-way pipe is suspended through the multi-port static pipe column, so that a concentric or eccentric completion structure of an internal auxiliary pipe column is realized.
Multipurpose valve/terminal valve cross is connected the side opening that the static tubular column of multiport corrosion-resistant alloy (CRA) hung the cross, the inside circulation passageway of supplementary tubular column of intercommunication. The multipurpose valve is used for production/emptying and/or purging/injection, and the terminal valve is used for realizing wellhead crossing of the auxiliary pipe column. The terminal valve includes at least two ports, a fluid assist string port and an electronic assist string port for venting and/or purging/injecting fluid and completing a wellhead traverse of the data line. The multi-purpose/terminal valve four-way is 113/16-135/8 inches in size and can be used for production and well control operations.
The flange adapter of the technical scheme of the utility model is used for connecting or a plurality of main valves and/or gas production tree at high temperature well head and well control system top can be based on and standard industry requirement and/or project requirement, install inline production valve, inflation production valve, main valve etc. for the coil pipe and/or drilling operation, coil pipe and/or well completion operation, coil pipe and/or production operation, the preventer of well control etc. that probably carry out in the future.
The static pipe column hanging cross joint of the multi-port corrosion-resistant alloy (CRA) is replaced to be a dynamic pipe column hanging cross joint of the multi-port corrosion-resistant alloy (CRA), so that the dynamic sealing between the ground and the underground can be realized, the possibility of damage or scrapping of a wellhead system caused by thermal expansion/deformation is avoided, and the overall production efficiency of the gasification furnace is improved. The multi-port corrosion-resistant alloy (CRA) dynamic pipe column hanging four-way joint comprises a hanging four-way joint body, a pipe column hanging part, a fluid auxiliary pipe column port, an electronic auxiliary pipe column port, a multipurpose valve, a terminal valve four-way joint and a locking mechanism.
The technical scheme of the utility model multiport corrosion-resistant alloy (CRA) developments tubular column hang the cross, have the low tolerance sleeve of taking the groove tooth, this groove tooth tapering to tubular column hangs the subassembly and can land again safely and sit at the design shoulder when needs (thermal energy and cooling compression), realizes the dynamic seal of tubular column.
Modularization high temperature well head well control system, multiport corrosion-resistant alloy (CRA) static tubular column hangs the cross or/and multiport corrosion-resistant alloy (CRA) dynamic tubular column hangs the inside tubular column of cross and hangs upper portion, but connect and install and/or a plurality of tubular columns in addition and hang for connect workover rig drilling rod or oil pipe, play the tubular column and implement the workover operation.
Modularization high temperature well head well control system, the inside dabber that is used for supplementary tubular column that multiport static tubular column hangs the cross hangs and can move downwards below the earth's surface and increase second multiport dabber and hang the shell, realizes or many fluid auxiliary columns and/or the concentric/eccentric of electron auxiliary column in the casing string (below the earth's surface) and hangs and pass through, finally can compress effectively modularization high temperature well head well control system is at the part and the height on earth's surface, the implementation of the commercialization project of being convenient for.
The utility model discloses an operating method of modularization high temperature well head well control system, operating method is as follows:
1. installing a casing head and connecting a surface casing;
2. the base plate is directly connected to the guide pipe shell, the setting height of the surface casing pipe is adjusted, and surface casing pipe cement well cementation and related installation tests are implemented;
3. installing an integral casing suspension cylinder, suspending and connecting a production casing through a groove type mandrel, fixing the position of the production casing through a locking mechanism, and implementing cement cementing and related installation tests of the production casing;
4. installing a multi-port static tubular column hanging four-way body;
5. installing a sealing gland and a multi-port mandrel suspension shell, and implementing pipe column and auxiliary pipe column lower pipe after fixing the multi-port mandrel suspension position through a locking bolt;
6. installing a mandrel hanger in the multi-port mandrel hanger shell to finish auxiliary tubular column hanging;
7. installing a multi-port corrosion-resistant alloy static tubular column suspension four-way body and a full-inner-diameter valve on a side hole;
8. connecting the auxiliary pipe column and the corresponding port and installing a multi-purpose valve/terminal valve four-way valve to complete the crossing of the auxiliary pipe column;
9. installing a pipe column suspension, and fixing the position of the pipe column through a locking mechanism;
10. installing an adapter and implementing related installation tests;
11. the modularized high-temperature wellhead well control system is arranged on an injection well and used for injecting an oxidant through a pipe column or used as a channel of oxidant injection equipment
12. The modularized high-temperature wellhead well control system is arranged on a product well and outputs a synthesis gas product through a pipe column;
13. injecting a secondary production fluid, such as a coolant, catalyst, auxiliary feedstock, purge fluid, etc., through the fluid assist column;
14. real-time monitoring and controlling underground coal gasification process parameters and conditions through an electronic auxiliary pipe column;
15. and annular space channels among the pipe column, the auxiliary pipe column and the production casing are used as a pressure relief channel, an injection channel and a purging channel under abnormal operation conditions.
Wherein, in the operating method, if a dynamic seal terminal is adopted, the locking mechanism in step 9 is used for adjusting the maximum range of dynamic seal instead of fixing the position of the pipe column.
Through adopting modularization high temperature well head well control system, all designs, measurement, manufacturing and most tests and verifications can be accomplished before transporting to the remote project scene, only need carry out integrality tests when arriving the scene if the design changes, will not change modularization high temperature well head well control system main part only needs to hang to specific tubular column adjustment specific tubular column, and this will show the economic cost and the time cost that reduce the project, increase the economic nature and the flexibility of project.
Embodiments of the present invention are described further with reference to the drawings.
FIG. 1 shows a schematic diagram of modular high temperature wellheads with static seal terminations and associated well control systems including, from bottom to top, a base plate 1, a casing head 2, a one-piece casing hanger spool 3, a multi-port static tubular string hanger spool 5, a multi-port Corrosion Resistant Alloy (CRA) static tubular string hanger spool 8 and a flange adaptor 9. the base plate 1 is attached directly to the upper portion of a conductor pipe, the lower portion of the casing head 2 is attached to the base plate 1 and a surface casing, the upper portion of the casing head 2 is attached to the one-piece casing hanger spool 3, within which the production casing is attached by a slotted mandrel hanger 19 and the production casing is secured in position by a locking mechanism 4. the upper portion of the one-piece casing hanger spool 3 is attached to the multi-port static tubular string hanger spool 5, within which the multi-port mandrel hanger spool 19, a sealing gland 18, a multi-port mandrel hanger housing 14 and a mandrel hanger 17 are attached concentrically/eccentrically to the fluid auxiliary tubular string 16 and the electronic auxiliary tubular string 17. the annular space between each tubular string and the production casing is connected via the multi-port Corrosion Resistant Alloy (CRA) hanger spool 8, within which the multi-port valve 7 and terminal valve 12 are attached to the static tubular string and the.
FIG. 2 shows a schematic diagram of the top of modular high temperature wellheads with dynamically sealed terminations and associated well control systems, the following components of the schematic are similar to those of FIG. 1 (not shown), including a base plate 1, a casing head 2, an integral casing hanger spool 3, a multi-port static string hanging cross-piece 5, a top-connected multi-port Corrosion Resistant Alloy (CRA) dynamic string hanging cross-piece 21 within which the auxiliary string traverses through the multi-purpose valve 7 and the termination valve cross-piece 12, and a string hanging connection and dynamic sealing within which the string 20 is suspended by the string hanging piece 10.
FIG. 3 is a schematic view of another modular high temperature wellheads with static seal terminations and associated well control systems, similar to FIG. 1 (not shown), including a base plate 1, a casing head 2, an integral casing hanger spool 3, a multi-port static pipe string hanger spool 5, a multi-port Corrosion Resistant Alloy (CRA) static pipe string hanger spool hanger spool 8 connected at the top, pipe string retrieval/workover performed by installing a pipe string hanger (workover) 22 on top of the pipe string hanger 10 inside it, FIG. 3 also becomes modular high temperature wellheads with dynamic seal terminations and associated well control systems through which pipe string retrieval/workover can be performed by using the multi-port Corrosion Resistant Alloy (CRA) dynamic pipe string hanger spool 21 shown in FIG. 2.
FIG. 4 is a schematic diagram of another modular high temperature wellheads and associated well control systems with static seal terminations, with an auxiliary electronics string 15 and an auxiliary fluid string 16 suspended inside the previous production casing string (below the surface). The further steps compress the components of the wellheads at the surface, making the design more compact.furthermore, by using the multi-port Corrosion Resistant Alloy (CRA) dynamic string suspension cross 21 shown in FIG. 2, FIG. 4 also results in modular high temperature wellheads and associated well control systems with dynamic seal terminations.
The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The modularized high-temperature wellhead well control system for the underground coal gasification process is characterized by comprising a base plate, a casing head, an integral casing suspension cylinder, a multi-port static pipe column suspension cross joint, a multi-port corrosion-resistant alloy static pipe column suspension cross joint and a multi-port corrosion-resistant alloy static pipe column suspension cross joint, wherein the base plate is used for increasing the integrity of the modularized high-temperature wellhead well control system and improving the flexibility of the depth of a surface casing, the casing head is used for connecting a surface casing in the high-temperature wellhead well control system, the integral casing suspension cylinder is used for connecting and suspending a production casing in the high-temperature wellhead well control system and comprises a groove type mandrel suspension system, a cement well casing monitoring system and a locking mechanism, the multi-port static pipe column suspension cross joint is used for connecting and suspending auxiliary pipe columns in the high-temperature wellhead well control system and achieving concentric/penetrating of or multiple fluid auxiliary pipe columns and/or electronic auxiliary pipe columns in a wellhead, the well comprises a suspension four-port eccentric body, a multi-port mandrel suspension housing, a sealing gland, a full-diameter valve and a locking mechanism, a full-port and a multi-port flange, a multi-port connecting and a multi-port connecting adapter for connecting the multi-port suspension cross joint suspension system and a well control system for.
2. The modular high-temperature wellhead well control system for the underground coal gasification process as claimed in claim 1, wherein the design pressure of the modular high-temperature wellhead well control system is 1000-.
3. The system of claim 1, wherein the slot mandrel suspension is replaced by a sliding block type casing suspension when a production casing needs to be in a compression or tension state after well cementation according to the geological conditions of a shaft, the integral casing suspension cylinder contains metal-metal seals or gland seals at a production casing landing shoulder and/or the bottom of the integral casing suspension cylinder, the cement well casing monitoring system is integrated with temperature monitoring, pressure monitoring, sound monitoring and gas composition monitoring, and the cement well casing monitoring system has a function of remote measurement or real-time information transmission or a function of generating a data file which can be downloaded in a preset period.
4. The modular high temperature wellhead well control system for the underground coal gasification process of claim 1, wherein in the multi-port static pipe string hanging cross, the fluid auxiliary pipe string and/or the electronic auxiliary pipe string are statically hung in the hanging cross body, the auxiliary pipe string comprises a single oil pipe string, a concentric oil pipe string, a production pipe string, a casing pipe, a reverse circulation pipe string and an instrument pipe string, and when the geological conditions of the shaft require that the pipe string is in a compression or tension state, the mandrel hanging is replaced by a sliding block type hanging.
5. The modular high temperature wellhead well control system for the underground coal gasification process of claim 1, wherein the slotted mandrel suspension is used for statically suspending pipe strings in the high temperature wellhead well control system, the pipe strings comprise a single oil pipe string, a concentric oil pipe string, a production pipe string, a casing, a reverse circulation pipe string and an instrument pipe string, and when the geological conditions of the shaft require that the pipe strings are in a compressed or tensioned state, the mandrel suspension is replaced by a slide block suspension; the full-inner-diameter valve is connected to a side hole of a multi-port static pipe column suspension four-way joint, is communicated with an annular space channel between a production casing pipe and a pipe column and an auxiliary pipe column and is used for production/emptying and/or blowing/injection, and the size of the full-inner-diameter valve is 113/16-135/8 inches.
6. The modular high temperature wellhead well control system for the underground coal gasification process of claim 1, wherein the multiport corrosion resistant alloy static pipe string hangs a cross, the pipe string hangs statically in the hanging cross body through a pipe string, the pipe string comprises a single oil pipe string, a concentric oil pipe string, a production pipe string, a casing, a reverse circulation pipe string and an instrument pipe string, and when the geological conditions of the shaft require that the pipe string is in a compression or tension state, the mandrel hanging is changed into a slider type hanging.
7. The modular high temperature wellhead well control system for the underground coal gasification process of claim 1, wherein the multi-purpose valve/terminal valve cross is connected to a side port of a multi-port corrosion resistant alloy static pipe string suspension cross communicating with an auxiliary pipe string internal flow passage, the multi-purpose valve is used for production/venting and/or purging/injection, the terminal valve cross is used for wellhead cross of the auxiliary pipe string, the terminal valve comprises at least two ports, a fluid auxiliary pipe string port and an electronic auxiliary pipe string port, the multi-purpose valve/terminal valve cross is used for venting and/or purging/injection of fluid and completing wellhead cross of a data line, and the multi-purpose valve/terminal valve cross is 113/16-135/8 inches in size.
8. The modular high-temperature wellhead well control system for the underground coal gasification process according to claim 1, wherein the ground and downhole dynamic sealing is realized by replacing the multi-port corrosion-resistant alloy static pipe string hanging four-way joint with a multi-port corrosion-resistant alloy dynamic pipe string hanging four-way joint, and the multi-port corrosion-resistant alloy dynamic pipe string hanging four-way joint also comprises a hanging four-way joint body, a pipe string hanging part, a fluid auxiliary pipe string port, an electronic auxiliary pipe string port, a multipurpose valve, a terminal valve four-way joint and a locking mechanism; the multi-port corrosion resistant alloy dynamic string suspension cross-piece has a low tolerance sleeve with castellations that are tapered so that the string suspension assembly can safely be re-landed and seated on the design shoulder when needed to effect dynamic sealing of the string.
9. The modular high temperature wellhead well control system for the underground coal gasification process of claim l, wherein the mandrel suspension for the auxiliary string inside the multi-port static string suspension cross can be shifted down below the surface and a second multi-port mandrel suspension housing added to achieve concentric/eccentric suspension and traversal of or more fluid auxiliary strings and/or electronic auxiliary strings below the surface inside the casing string to effectively compress the components and height of the modular high temperature wellhead well control system at the surface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109653700A (en) * | 2019-02-15 | 2019-04-19 | 中为(上海)能源技术有限公司 | For its operating method of the Modular high-temperature well head well control system of coal underground gasifying technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109653700A (en) * | 2019-02-15 | 2019-04-19 | 中为(上海)能源技术有限公司 | For its operating method of the Modular high-temperature well head well control system of coal underground gasifying technology |
| CN109653700B (en) * | 2019-02-15 | 2023-06-23 | 中为(上海)能源技术有限公司 | Operation method of modularized high-temperature wellhead well control system for underground coal gasification process |
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