CN211448647U - Instrument pipe column wellhead penetrating system for coal underground gasification process - Google Patents
Instrument pipe column wellhead penetrating system for coal underground gasification process Download PDFInfo
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- CN211448647U CN211448647U CN201920687407.4U CN201920687407U CN211448647U CN 211448647 U CN211448647 U CN 211448647U CN 201920687407 U CN201920687407 U CN 201920687407U CN 211448647 U CN211448647 U CN 211448647U
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Abstract
The utility model provides an instrument tubular column well head passes through system for coal underground gasification technology, including following subassembly: the well head comprises an armored thermocouple pipe column, an armored optical fiber pipe column, DSA blind flange, a first DSA blind flange and a well head main body, wherein the armored thermocouple pipe column and the armored optical fiber pipe column respectively pass through the first DSA blind flange in a sealing mode through a compression clamping sleeve sealing joint; at least two sections of double-end flanges are connected with the pipe sections; and after the protective sheaths of the armored thermocouple pipe column and the armored optical fiber pipe column are stripped, the thermocouple measuring element in the armored thermocouple pipe column and the optical fiber in the armored optical fiber pipe column hermetically penetrate through the third DSA blind flange through the thermocouple threaded sealing connector and are connected with an instrument data transmitter arranged outside the third DSA blind flange. When utilizing the utility model discloses an instrument tubular column well head passes through system carries out coal underground gasification process, has realized the real-time feedback and the control to operating mode in the pit, and the technology operation is more nimble convenient.
Description
Technical Field
The utility model provides an instrument tubular column well head passes through system for coal underground gasification technology (ISC), belongs to coal underground gasification process equipment technical field.
Background
Coal underground gasification (ISC) is a process in which coal is directly converted by combustion and gasification reactions of an underground coal seam in the presence of an oxidant into a product gas, commonly referred to as syngas, which can then be used as a feedstock for a variety of applications, including fuel production, chemical production, and power generation, among others. The underground coal gasification technology is suitable for most coal reserves. This technique is clearly attractive in view of the ever more stringent environmental requirements associated with the mining industry and in view of the associated labour and capital costs. The coal gasification process is a process of converting coal into synthesis gas through a series of chemical reactions. Wherein the main reactions comprise:
C+O2→CO2(complete oxidation reaction)
C+1/2O2→ CO (partial oxidation reaction)
C+H2O→H2+ CO (steam gasification reaction)
C+2H2→CH4(Hydrogen gasification reaction)
C+CO2→ 2CO (carbon dioxide gasification reaction)
The surface well drilling is directly communicated with the coal bed, and an effective channel is provided for oxidant injection and product gas production. A pair of wells communicates or extends horizontally underground to form a substantially horizontal well bore (also referred to simply as a coal seam well or communication passage). The channels facilitate oxidant injection, burnout zone growth, and product gas transport. One well for oxidant injection is called an "injection well" and the other well for production of product gas is called a "production well". Both directional horizontal and vertical wells may be used as injection or production wells. Coal underground gasification (ISC) may also require the use of one or more vertical wells (e.g., function and auxiliary wells) between the injection and production wells.
When injection wells, production wells, and horizontal channels connect coal seams, this configuration is referred to as an underground coal gasification (ISC) unit or well pair. The ISC unit includes a combustion zone, a gasification zone, and a pyrolysis zone. Wherein the combustion zone is near an oxidant injection point in the coal seam; the gasification zone surrounds the combustion zone in a radial shape or is arranged at the downstream of the combustion zone, and coal is gasified and partially oxidized in the gasification zone so as to generate product gas; the pyrolysis zone is downstream of the gasification zone where the pyrolysis reaction of the coal typically takes place. The hot product gas flows downstream from the gasification zone and is ultimately transported to the surface from the product wellhead. The ISC burned-out area in the coal seam grows larger while the coal is burning or gasifying.
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) the existing underground coal gasification monitoring instrument system cannot feed back the working condition of the underground gasification furnace in real time, only can adopt blind, passive and extensive control, and seriously influences the stability and controllability of the underground coal gasification process.
b) The existing underground control system and wellhead traversing equipment of the oil-gas well are expensive, the production and transportation period is long, the investment and the cost of the coal underground gasification project are seriously increased, and the economic feasibility of the project is reduced.
c) The existing underground control system and wellhead penetrating equipment of the oil and gas well cannot meet the harsh working conditions (high temperature, high pressure, hydrogen environment, corrosion environment and the like) of the coal underground gasification process. Related equipment is very easy to lose efficacy or damage, and the design life of the underground gasification furnace cannot be met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve prior art's not enough, provide an instrument tubular column well head through system, instrument tubular column well head through system is favorable to improving current coal underground gasification technology.
Through adopting the instrument tubular column well head passes through the system, the utility model provides a technical problem in the coal underground gasification technology. The instrument string wellhead crossing system is positioned at the ISC injection well and the wellhead of the production well. The instrument tubular column well head passes through system includes following part:
a well head main part for coal underground gasification, its characterized in that are based on instrument tubular column well head crossing system for coal underground gasification technology: the system comprises the following components:
an armored thermocouple pipe column and an armored fiber pipe column which are arranged in parallel,
the first DSA blind flange is fixedly sealed with the wellhead main body, and the armored thermocouple tubular column and the armored optical fiber tubular column hermetically penetrate through the first DSA blind flange through the compression ferrule sealing joint respectively;
the outer end of the second DSA blind flange is fixedly arranged at the outer end of the second double-end flange connecting pipe section;
and after the protective sheaths of the armored thermocouple pipe column and the armored optical fiber pipe column are stripped, the thermocouple measuring element in the armored thermocouple pipe column and the optical fiber in the armored optical fiber pipe column hermetically penetrate through the third DSA blind flange through the thermocouple threaded sealing connector and are connected with an instrument data transmitter arranged outside the third DSA blind flange.
Instrument tubular column well head passes through the system can pass through the figure of pipeline section according to the figure adjustment of actual underground instrument tubular column, realizes that underground instrument tubular column's well head passes through to give the central control room of project with the real-time data feedback of underground instrument through passing through the instrument data changer in pipeline section low reaches.
Instrument tubular column well head passes through the system and can pass through the well head for instrument tubular column in the pit and provide a withstand voltage confined space and carry out data signal's transmission. Meanwhile, inert gas purging can be performed on an armored annular gap of the instrument pipe column through the instrument pipe column wellhead penetrating system, the instrument pipe column is prevented from being damaged by countercurrent high-temperature high-pressure synthesis gas, the wellhead leakage is avoided, and signal attenuation caused by optical fiber darkening by hydrogen is avoided.
According to the utility model discloses, when utilizing the utility model discloses an instrument tubular column well head passes through system carries out coal underground gasification process, has realized the real-time feedback and the control to operating mode in the pit, and the technology operation is more convenient for nimble to realize the continuous steady operation of coal underground gasification technology, brought the progress for prior art.
Drawings
FIG. 1 is a schematic diagram of a complete instrumentation string wellhead traversing system.
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. the well head comprises a well head main body, 2 an armored thermocouple pipe column, 3 an armored optical fiber pipe column, 4 a stud bolt connection blind flange (DSA blind flange), 5 a compression clamping sleeve sealing joint, 6 a welding/melting point, 7 a stud flange connection pipe section, 8 a thermocouple thread sealing connector, 9 an optical fiber thread sealing connector, 10 an instrument data transmitter, 11 a check valve and 12 a purging/emptying port.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific embodiments and with reference to the accompanying drawings.
A well head main part for coal underground gasification, its characterized in that are based on instrument tubular column well head crossing system for coal underground gasification technology: the system comprises the following components:
an armored thermocouple pipe column and an armored fiber pipe column which are arranged in parallel,
the first DSA blind flange is fixedly sealed with the wellhead main body, and the armored thermocouple tubular column and the armored optical fiber tubular column hermetically penetrate through the first DSA blind flange through the compression ferrule sealing joint respectively;
the outer end of the second DSA blind flange is fixedly arranged at the outer end of the second double-end flange connecting pipe section;
and after the protective sheaths of the armored thermocouple pipe column and the armored optical fiber pipe column are stripped, the thermocouple measuring element in the armored thermocouple pipe column and the optical fiber in the armored optical fiber pipe column hermetically penetrate through the third DSA blind flange through the thermocouple threaded sealing connector and are connected with an instrument data transmitter arranged outside the third DSA blind flange.
For a wellhead body used for the ISC well pair in the coal underground gasification process, the design pressure of the wellhead body needs to meet the pressure requirements of all standard industrial or non-industrial regulatory agencies, 1,000-; the maximum design temperature can reach 150-500 ℃; the material selected can be selected according to the API specification corrosion protection rating of the oil and gas industry, including but not limited to AA (suitable for basically non-corrosive liquid or gas), BB (suitable for corrosion resistance of 13 chromium stainless steel internal parts and also suitable for slight corrosion of internal surfaces), CC (suitable for any liquid or gas state meeting 13 chromium stainless steel), DD (suitable for low-temperature acid gas and oil and 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 above (referring to higher material grades); its design specification levels (PSL) include, but are not limited to, PSL-1, PSL-2, and PSL-3 that meet API specifications; and its design size (path) includes, but is not limited to, 5-30 inches.
The utility model discloses an instrument tubular column among the technical scheme, including armor thermocouple tubular column and armor fiber optic pipe post. Wherein the sheathed thermocouple string comprises a dual or multi-probe mineral insulated type K thermocouple, and a single or double continuous tube protective sheath having a diameter of 1/8 to 1 inch. The protective sheath of the continuous tube is made of 304 stainless steel, 316L stainless steel or nickel-chromium alloy 625, so that the harsh working condition of the underground gasification furnace is met. Wherein the armored fiber optic tubing string comprises single or double optical fibers and three or four continuous tube protective sheaths having a diameter of 1/8 to 1 inch. The three-layer continuous tube protective sheath is made of 316L stainless steel, aluminum and nickel-chromium alloy 825 from inside to outside. The mechanical property of the armored optical fiber pipe column can be improved by adding the protective sheath of the fourth layer of carbon steel continuous pipe, and the harsh working condition of the underground gasification furnace is met.
The utility model discloses a stud among the technical scheme connects blind flange (DSA blind flange) for the well head main part and each instrument tubular column well head that sealed ISC well is right pass through the pipeline section. The DSA blind flange is used for drilling and tapping according to the number and the size of the instrument pipe columns. The design temperature (150-. Then the design temperature (150 ℃ -.
The technical scheme of the utility model the double-end flange connection pipeline section for the successive layer peels off the armor protection sheath of instrument tubular column and carries out airtight passing through of instrument measuring element. The design temperature is 150 ℃ and 500 ℃, the design pressure is 14-20MPa, the design size (drift diameter) is 4-10 inches, and the selected material is carbon steel. The wellhead penetrating pipe section of the armored thermocouple pipe column is used for the closed penetrating of a thermode (a thermocouple wire) of a thermocouple. The armored optical fiber pipe column wellhead crossing pipe section is used for the closed crossing of the optical fiber body.
The technical scheme of the utility model the compression cutting ferrule sealing joint for the armor protection sheath of sealed instrument tubular column. The compression clamping sleeve sealing joint is connected into a threaded drilling hole of the DSA blind flange through threads and is in sealing connection through set torque. After the instrument pipe column passes through the DSA blind flange, the outermost layer armor continuous pipe of the instrument pipe column is sealed by the clamping sleeve seal and the set torque.
The technical scheme of the utility model the thread sealing connector for the measuring element in the sealed instrument tubular column. The sealing connector is connected into a threaded drilling hole of the DSA blind flange through threads and is in sealing connection through set torque. The design temperature is-150 ℃ and 350 ℃, the design pressure is 14-20MPa, the design size (drift diameter) is 1/8-1/2 inches, the material of the body is 304 stainless steel, and the inner sealing material is polytetrafluoroethylene. The measuring elements in the instrument string are respectively connected to the thermodes (thermocouple wires) and/or the optical fibers at two ends of the thread sealing connector through welding and/or melting.
The technical scheme of the utility model check valve for one-way inert gas sweeps, like nitrogen gas or carbon dioxide, avoids the high temperature high pressure synthetic gas against the current to damage instrument tubular column and well head and leaks, and avoids optic fibre to be caused signal attenuation by the hydrogen darkening. The design temperature is 150 ℃ and 500 ℃, the design pressure is 14-20MPa, the design size (drift diameter) is 1/4-1 inch, and the material is 304 stainless steel.
The technical scheme of the utility model the sweep/vent port for the inert gas of double-end flange connection pipeline section in normal production process sweeps and the pressure release in the equipment maintenance in-process.
The utility model discloses an instrument data changer among the technical scheme for receive the real-time data signal of underground instrument and the central control room of transmission feedback to the project. The instrument data transmitter with the storage battery and the large solar panel can be placed at the wellhead, is directly connected with a measuring element after the wellhead of the underground instrument passes through, and is transmitted to a control system of a central control room through wireless transmission. Or the measuring element after the well head of the underground instrument passes through is connected to a data transmitter positioned between the cabinets through a compensating wire and then is transmitted to a control system of the central control room through a signal cable.
When utilizing the utility model discloses an instrument tubular column well head passes through when system implements coal underground gasification process, has realized the real-time feedback and the control to operating mode in the pit, and the technology operation is more nimble convenient, improves the control stability and the production efficiency of whole coal underground gasification technology, can reduce cost simultaneously, especially implements the ISC project in remote area.
Embodiments of the present invention are further described below with reference to the accompanying drawings.
FIG. 1 shows a instrumentation string wellhead traversing system. The armored thermocouple pipe column 2 and the armored optical fiber pipe column 3 enter the wellhead main body 1 through a downhole instrument pipe column channel, and are cut into sections after a certain design length is reserved. The armored thermocouple column 2 and the armored fiber optic column 3 will be tested from each link before purchase, delivery, downhole and final cut-off to ensure the integrity of the armored thermocouple column 2 and the armored fiber optic column 3. The armored thermocouple pipe column 2 and the armored optical fiber pipe column 3 hermetically penetrate through the first DSA blind flange 4 through the compression ferrule sealing joint 5, and the first DSA blind flange 4 is connected to the flange end face of the wellhead main body 1 through flange bolts. And after the air tightness test is finished, connecting a first double-end flange connecting pipe section 7 at the other end of the first DSA blind flange 4. After a protective sheath of the armored thermocouple pipe column 2 is peeled off in the double-end flange connecting pipe section 7, a thermocouple measuring element (thermocouple wire) passes through the second DSA blind flange 4 in a sealing mode through a thermocouple thread sealing connector 8 and a welding mode 6. The armored optical fiber pipe column 3 directly passes through the second DSA blind flange 4 in a sealing mode through the compression ferrule sealing joint 5. The second DSA blind flange 4 is connected to the first double-headed flange connecting pipe section 7 by flange bolts. And after the air tightness test is finished, the other end of the second DSA blind flange 4 is connected with a second double-headed flange connecting pipe section 7. After the protective sheath of the armored fiber optic pipe column 3 is stripped in the pipe section, the optical fiber passes through the third DSA blind flange 4 (terminal flange) in a sealing mode through the fiber thread sealing connector 9 and the fusion 6, and then is connected to an instrument data transmitter 10 outside a wellhead. The stripped thermocouple measurement element (thermocouple wire) is directly sealed by welding 6 and another thermocouple thread sealing connector 8 to pass through the third DSA blind flange 4, and then is connected to an instrument data transmitter 10 outside the wellhead. Finally, a check valve 11 and a purge/vent port 12 are installed on the outer end face of the third DSA blind flange 4, and a gas tightness test is performed.
The above-described embodiments are only 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 scope of the claims. It will be apparent to those skilled in the art that variations and modifications can be made without departing from the spirit and principles of the invention.
Claims (7)
1. A well head main part for coal underground gasification, its characterized in that are based on instrument tubular column well head crossing system for coal underground gasification technology: the system comprises the following components:
an armored thermocouple pipe column and an armored fiber pipe column which are arranged in parallel,
the first DSA blind flange is fixedly sealed with the wellhead main body, and the armored thermocouple tubular column and the armored optical fiber tubular column hermetically penetrate through the first DSA blind flange through the compression ferrule sealing joint respectively;
the outer end of the second DSA blind flange is fixedly arranged at the outer end of the second double-end flange connecting pipe section;
and after the protective sheaths of the armored thermocouple pipe column and the armored optical fiber pipe column are stripped, the thermocouple measuring element in the armored thermocouple pipe column and the optical fiber in the armored optical fiber pipe column hermetically penetrate through the third DSA blind flange through the thermocouple threaded sealing connector and are connected with an instrument data transmitter arranged outside the third DSA blind flange.
2. The instrumentation tubing string wellhead traversing system for coal underground gasification process according to claim 1, wherein: and a check valve is fixedly arranged on the outer end face of the third DSA blind flange and is communicated with a purging/emptying port.
3. The instrumentation tubing string wellhead traversing system for coal underground gasification process according to claim 1, wherein: the armored thermocouple column comprises a double-probe or multi-probe mineral insulation K-type thermocouple and a single-layer or double-layer continuous tube protective sheath with the diameter of 1/8-1 inch, the continuous tube protective sheath is made of 304 stainless steel, 316L stainless steel or nichrome 625, the armored optical fiber column comprises a single or double optical fiber and three or four layers of continuous tube protective sheaths with the diameter of 1/8-1 inch, the three layers of continuous tube protective sheaths are made of 316L stainless steel, aluminum and nickel-chromium alloy 825 respectively from inside to outside, and the fourth layer of continuous tube protective sheath is made of carbon steel.
4. The instrumentation tubing string wellhead traversing system for coal underground gasification process according to claim 1, wherein: the design temperature of the DSA blind flange directly connected with the wellhead body is 150-.
5. The instrumentation tubing string wellhead traversing system for coal underground gasification process according to claim 1, wherein: the design temperature of the double-end flange connecting pipe section is 150-.
6. The instrumentation tubing string wellhead traversing system for coal underground gasification process according to claim 1, wherein: the sealed connector is connected into a threaded drill hole of a DSA blind flange through threads and is connected in a sealed mode through set torque, the design temperature is-150-350 ℃, the design pressure is 14-20MPa, the drift diameter is 1/8-1/2 inches, the material of the body is 304 stainless steel material, the material of the inner sealing material is polytetrafluoroethylene and polytetrafluoroethylene, and the measuring elements in the pipe column are connected to hot electrodes and/or optical fibers at two ends of the threaded sealed connector respectively in a welding and/or melting mode.
7. The instrumentation tubing string wellhead traversing system for the underground coal gasification process as claimed in claim 2, wherein: the design temperature of the check valve is 150 ℃ and 500 ℃, the design pressure is 14-20MPa, the drift diameter is 1/4-1 inch, and the material is 304 stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920687407.4U CN211448647U (en) | 2019-05-14 | 2019-05-14 | Instrument pipe column wellhead penetrating system for coal underground gasification process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920687407.4U CN211448647U (en) | 2019-05-14 | 2019-05-14 | Instrument pipe column wellhead penetrating system for coal underground gasification process |
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| CN211448647U true CN211448647U (en) | 2020-09-08 |
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| CN201920687407.4U Active CN211448647U (en) | 2019-05-14 | 2019-05-14 | Instrument pipe column wellhead penetrating system for coal underground gasification process |
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