CN112727431A - Multifunctional production well wellhead device for underground coal gasification - Google Patents
Multifunctional production well wellhead device for underground coal gasification Download PDFInfo
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- CN112727431A CN112727431A CN202110038205.9A CN202110038205A CN112727431A CN 112727431 A CN112727431 A CN 112727431A CN 202110038205 A CN202110038205 A CN 202110038205A CN 112727431 A CN112727431 A CN 112727431A
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- 239000003245 coal Substances 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- 238000002309 gasification Methods 0.000 title claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 57
- 239000007921 spray Substances 0.000 claims abstract description 39
- 239000011280 coal tar Substances 0.000 claims abstract description 37
- 229920001971 elastomer Polymers 0.000 claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 238000010008 shearing Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 6
- 210000004907 gland Anatomy 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003818 cinder Substances 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 90
- 239000002245 particle Substances 0.000 description 14
- 230000008569 process Effects 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/047—Casing heads; Suspending casings or tubings in well heads for plural tubing strings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A multifunctional production well wellhead device for underground coal gasification comprises a high-temperature-resistant gas pipe head, a shearing plugging ball valve, a spray assembly, a three-way output port, a coal slag filter and a coal tar scrubber, wherein the three-way output port is provided with an optical fiber lower inlet for a monitoring instrument to be put in, the spray assembly is provided with a rubber core for a dynamic sealing spray pipe, the coal slag filter is three-layer filtering and the filter screen is replaceable, the coal tar in the gas produced by the wellhead can be removed through the coal tar washer, the spray pipe and the main plugging channel can be cut off by cutting the plugging ball valve, and the well can be closed under the emergency condition; meanwhile, the multifunctional electric heating cooker has the characteristics of multiple functions, simple structure, installation method and simple operation.
Description
Technical Field
The invention relates to the field of underground coal gasification, in particular to a multifunctional production well wellhead device for underground coal gasification.
Background
In recent years, domestic oil and gas consumption is rapidly increased, the position of natural gas in an energy structure is increasingly prominent, and the development of the natural gas is in the golden age. The underground coal gasification technology is changed into physical coal mining into chemical gas production, so that the safety and ecological environment problems caused by coal mining can be effectively improved, and the coal utilization is transferred to the mature natural gas industry from a direct combustion utilization terminal. Compared with the ground coal gas production project, the underground coal gasification is more environment-friendly and more economical, the energy density, the gas production speed and the efficiency are far higher than those of the currently developed unconventional gas, and a new expansion space is provided for the development of the coal chemical industry.
The underground coal gasification process is commercialized in foreign countries, such as russia, italy and other countries, and has higher economic benefit compared with traditional underground mining, and the research of the underground coal gasification process in China is late, and the underground coal gasification process is not commercialized in the experimental stage although the theoretical research has made a breakthrough, because the research of key equipment has not made a breakthrough. The basic process of underground coal gasification comprises the following steps: constructing underground coal bed into a closed gasification furnace from ground or underground construction, injecting necessary chemical agent from ground injection wellhead device, igniting the coal in the stratum, and producing H through a series of chemical reactions2、CO、CH4The well head output gas which is the main combustible component is conveyed to the ground through the production well head. The production well wellhead device belongs to key equipment in the coal underground gasification process, high-temperature and high-pressure well wellhead output gas up to thousands of degrees centigrade needs to be borne, the produced well wellhead output gas also contains a large amount of cinder particles and coal tar, the particles can erode equipment and pipelines under the driving of gas, meanwhile, the coal tar and the particles are mixed together to block the well wellhead pipelines, the existing well wellhead device can not meet the process and function requirements of the production well special wellhead device in the coal underground gasification technology, and the production well wellhead device is mainly embodied in the following aspects:
(1) under the general condition, the temperature of gas produced at the bottom of a production well is above 700 ℃, so that the casing of the production well is easily changed, and the wellhead device is lifted, and the conventional wellhead device cannot work under the high-temperature working condition for a long time.
(2) The gas produced by the wellhead contains a large amount of cinder particles and coal tar, and under the drive of the gas, the particles can cause severe erosion to equipment and pipelines, so that the service life of the equipment is greatly shortened, and the cinder particles can be mixed with the coal tar to cause the blockage of the pipelines. The coal cinder particles and coal tar in the gas produced at the wellhead need to be removed.
(3) The spray pipe needs to be dragged to control the position height of spraying in the underground coal gasification production process, so a spray pipe dynamic sealing device needs to be arranged on a wellhead device of a production well.
(4) The production well head device needs to monitor the production state of the well bottom in real time in the production process so as to adjust the injection amount and the spraying height of cooling water, an optical fiber descending channel and a corresponding descending channel high-temperature sealing structure need to be designed, but the existing well head device is lack of a descending channel of sufficient monitoring equipment.
Therefore, at present, the invention is needed to provide a multifunctional production well wellhead device for underground coal gasification, which can simultaneously solve the safety problem, the erosion problem, the device spray cooling problem and the coal tar removal problem under ultra-high temperature, so that the produced gas produced by the well wellhead can be directly applied to the next step of industrialization, and meanwhile, the structure is simple and convenient to install, the cost of the underground coal gasification well wellhead device is reduced, and the underground coal gasification commercialization process is promoted.
The invention content is as follows:
in order to solve the problems, the invention provides a multifunctional production well head device for underground coal gasification. The gas production pipe is a heat insulation oil pipe, and nitrogen is injected into the annular space between the technical sleeve and the gas production pipe through the high-temperature-resistant gas pipe head, so that the nitrogen has a good heat insulation effect, and the heating of the technical sleeve is reduced; the invention is designed with the cinder filter, which can remove cinder particles contained in gas produced by a wellhead, and meanwhile, the baffle is arranged on the side of the filter pipe, so that when the filter screen needs to be replaced after long-time use, only the integrated flat gate valve II needs to be operated manually and hydraulically temporarily, and then the baffle is opened to replace the filter screen, thereby solving the problems of blockage and erosion caused by the cinder particles and prolonging the service life of equipment. The coal tar scrubber is designed, ammonia water is injected through the one-way valve II arranged above the gas collecting pipe and is mixed with the wellhead produced gas passing through the gas collecting pipe, the ammonia is heated and volatilized to take away a large amount of heat in the wellhead produced gas, so that the wellhead produced gas can be cooled to a certain temperature to separate out coal tar in the wellhead produced gas, the coal tar is separated out and flows out of the gas collecting pipe from the one-way valve I arranged below the gas collecting pipe together with the sprayed residual ammonia water, and the coal tar in the wellhead produced gas can be removed by the coal tar scrubber, so that the pretreatment of the coal tar in the wellhead produced gas is realized. According to the invention, the spray assembly is arranged above the three-way of the output port, the spray assembly consists of a spray pipe hanger, a rubber core, a gland and a spray pipe, the diameter of the lower part of the inner wall of the gland is smaller than that of the lower part of the rubber core, the gland is connected above the spray pipe hanger by using a screw II to press and attach the rubber core to the spray pipe, dynamic sealing is realized, when the rubber core needs to be replaced, the rubber core can be replaced only by temporarily closing the shearing and plugging ball valve and withdrawing the screw II from the gland; the spraying pipe can spray and cool at any specified height, and the wellhead device can be used at coal underground gasification wellheads with different depths. The underground coal gasification is usually carried out at the depth of hundreds of meters to one thousand meters underground, and compared with an oil production well head, the well head depth of a production well is shallow. According to the invention, two optical fiber feeding channels and corresponding high-temperature sealing devices are arranged above the output port tee joint, so that optical fiber cables can be fed to realize real-time monitoring of the production state at the bottom of a well.
The invention relates to a multifunctional production well wellhead device for underground coal gasification, which comprises a high-temperature-resistant gas pipe head, a shearing plugging ball valve, a spraying assembly, a coal cinder filter and a coal tar scrubber, wherein the high-temperature-resistant gas pipe head is connected with the shearing plugging ball valve; the high-temperature-resistant gas pipe head is composed of a gas pipe large four-way, a manual-hydraulic integrated flat gate valve I, a gas pipe hanger, a sealing gland and a reinforced flexible graphite sealing ring, through holes in two sides of the gas pipe large four-way are connected with the manual-hydraulic integrated flat gate valve I through flanges, the gas pipe hanger is installed on a step I inside the gas pipe large four-way to realize radial fixation, the gas pipe hanger is connected with a gas production pipe through threads, the reinforced flexible graphite sealing ring is installed between the gas pipe hanger and the gas pipe large four-way, the reinforced flexible graphite sealing ring is tightly pressed on the gas pipe hanger through the sealing gland connected with the gas pipe hanger through a screw I, the lower part of the high-temperature-resistant gas pipe head is connected with a technical sleeve through sealing pipe threads, and the upper part of the high-temperature-; the spray assembly consists of a spray pipe hanger, a rubber core, a gland and a spray pipe, wherein an output port tee joint and the spray pipe hanger are sealed by a metal sealing ring, and the output port tee joint is connected with a manual-hydraulic integrated flat gate valve II by a flange; the cinder filter consists of a filter pipe, a filter screen I, a filter screen II, a filter screen III, a baffle and a rectangular sealing ring, and the cinder filter is connected with the coal tar washer through a flange; the coal tar washer consists of a gas collecting pipe, a one-way valve I and a one-way valve II.
The high-temperature sealing structure is characterized in that two optical fibers are arranged above the output port tee joint, the two optical fibers are arranged in a downward channel, the high-temperature sealing structure is composed of a flexible graphite gasket and a hollow hexagonal screw, the hollow hexagonal screw is connected through threads and is arranged in the optical fibers in the downward channel on the output port tee joint, and the hollow hexagonal screw is screwed to compress the flexible graphite gasket to enable the high-temperature sealing structure to work.
The rubber core is a conical rubber core with a middle hole made of high-temperature-resistant fluororubber, the taper of the inner wall of the gland is the same as that of the outer wall of the rubber core, particularly, the diameter of the bottom of the rubber core is slightly larger than that of the inner wall of the gland, the gland is fixedly installed on the spray pipe hanger through screwing a screw II during installation, and the inner wall of the gland tightly adheres the compressed rubber core to the spray pipe.
The ball valve core is installed on the ball valve seat, the ball valve core can use the axis of rotation of self to rotate as the axle center, the edge of ball valve core 29 is sharp cutting edge, the opposite side relative with the axis of rotation on the ball valve core is opened there is hexagonal hole, hexagonal hole and the hexagonal axle of carousel are transition fit, under emergency, can rotate the carousel and drive the rotatory optic fibre cable of cutting shower and going into of shutoff ball valve, realize closing the well.
The meshes of the filter screen I, the filter screen II and the filter screen III are sequentially reduced, one end close to the coal tar washer is the filter screen I with the largest mesh, and coal slag particles carried in the gas produced at the well head can be sequentially removed from large to small.
One side of the filter pipe is provided with a rectangular hole, a sealing step for mounting a rectangular sealing ring is arranged along the rectangular hole, blind holes and threads are respectively arranged on two sides of the rectangular hole, and three grooves which are distributed at equal intervals and used for mounting a filter screen are arranged in the filter pipe.
The gas collecting pipe upside is equipped with the water inlet, and the water inlet has into water check valve II through sealed tube threaded connection, and accessible check valve II pours into the aqueous ammonia into, and the gas collecting pipe downside is equipped with the delivery port, and the delivery port has out water check valve I through sealed tube threaded connection.
The lower end of the spray pipe is provided with randomly distributed water holes, so that injected cooling water can be fully contacted with gas produced by a well mouth after being atomized.
Advantageous effects
The invention has the beneficial effects that:
1. the invention adopts various modes to reduce the heating of the technical sleeve. In addition, the invention is designed with a spray pipe which can drag and adjust the downward penetration depth for spray cooling, and the lower end of the spray pipe is provided with randomly distributed water holes, so that the injected cooling water can be fully mixed with the gas produced at the well mouth after being atomized, the spray cooling effect is improved, the gas temperature produced at the well mouth is reduced, the heating of the technical sleeve is further reduced, and the lifting accident of the well mouth is avoided.
2. The invention is designed with a coal cinder filter, three filter screens with sequentially increased mesh number are arranged in the filter pipes at equal intervals, coal cinder particles contained in gas produced by a wellhead can be removed, meanwhile, the filter pipes are laterally provided with the baffle plates, when the filter screens need to be replaced after long-time use, only the shearing plugging ball valve needs to be temporarily closed, then the baffle plates are opened, and the filter screens are replaced, so that the problems of blockage and erosion caused by the coal cinder particles are solved, and the service life of the equipment is prolonged.
3. The coal tar scrubber can cool the gas produced by the wellhead to a certain temperature to separate out the coal tar in the gas produced by the wellhead, and the coal tar and the sprayed residual ammonia water flow out of the gas collecting pipe together from the one-way valve I arranged below the gas collecting pipe after being separated out, so that the pretreatment of the coal tar in the gas produced by the wellhead is realized.
4. Use screw II to compress tightly the laminating shower with gluing the core on the shower hanger with gland fastening connection, realize the dynamic seal, when needs are more glued the core, only need temporarily close the shutoff ball valve of cuting, withdraw from screw II and take off the gland, can change gluey core.
5. The invention can realize the complete coal underground gasification gas production function only by putting the technical casing and the gas production pipe and matching with the simple wellhead device, and has the function of removing the cinder particles and the coal tar in the gas produced by the wellhead, thereby reducing the cost of the coal underground gasification wellhead device.
6. Two optical fiber descending channels and corresponding high-temperature sealing devices are arranged above the three-way of the output port, so that the real-time monitoring of the production state at the bottom of the well is realized, and the problems that the existing wellhead device is lack of a descending channel of monitoring equipment, the curvature of the descending channel is too large, the descending accuracy is low and the like are solved.
7. The flat gate valve is controlled by adopting a manual and hydraulic integrated mode, in the normal production process, because the wellhead device is high in temperature and has certain danger due to manual operation, hydraulic control is safer and more convenient, when hydraulic control fails, workers can wear certain protection facilities to perform manual control, and the reliability of the device is ensured
Drawings
FIG. 1 is a two-dimensional schematic of the overall structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a three-dimensional schematic view of a filter tube according to the present invention;
FIG. 5 is a quarter-section three-dimensional view of a cinder filter according to the present invention;
FIG. 6 is a three-dimensional schematic view of a ball valve seat of the present invention;
FIG. 7 is a three-dimensional schematic view of a turntable according to the present invention;
FIG. 8 is a three-dimensional schematic view of the valve cartridge of the present invention;
FIG. 9 is a quarter-section three-dimensional view of a shear plugging ball valve of the present invention;
FIG. 10 is a half-section three-dimensional view of the shear plugging ball valve of the present invention closed;
FIG. 11 is a two-dimensional schematic view of a shower in accordance with the present invention;
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-technical casing, 2-gas production pipe, 3-metal sealing ring, 4-screw I, 5-gas pipe big four-way, 501-step I, 6-ball valve seat, 7-spray pipe, 701-water hole, 8-output port three-way, 801-optical fiber feeding channel, 9-flexible graphite gasket, 10-hollow hexagonal screw, 11-spray pipe hanger, 12-rubber core, 13-gland, 1301-inner gland wall, 14-manual and hydraulic integrated flat gate valve I, 15-gas pipe hanger, 16-reinforced flexible graphite sealing ring, 17-sealing gland, 18-one-way valve I, 19-screw II, 20-filter screen I, 21-filter screen II, 22-filter screen III, 23-filter pipe, 2301-rectangular hole, 2302-sealing step, 2303-blind hole thread, 2304-groove, 24-gas collecting pipe, 2401-water inlet, 2402-water outlet, 25-one-way valve II, 26-baffle, 27-rectangular sealing ring, 28-screw III, 29-ball valve core, 30-valve body, 31-ball valve turntable and 32-manual and hydraulic integrated flat gate valve II.
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings.
A multifunctional production well wellhead device for underground coal gasification comprises the following components:
comprises a high-temperature-resistant gas pipe head, a shearing plugging ball valve, a spraying assembly, a coal cinder filter and a coal tar washer; the high-temperature-resistant gas pipe head is composed of a gas pipe large four-way 5, a manual hydraulic integrated flat gate valve I14, a gas pipe hanger 15, a sealing gland 17 and a reinforced flexible graphite sealing ring 16, through holes in two sides of the gas pipe large four-way 5 are connected with the manual hydraulic integrated flat gate valve I3 through flanges, the gas pipe hanger 15 is installed on a step I501 inside the gas pipe large four-way 5 to realize radial fixation, the gas pipe hanger 15 is in threaded connection with a gas production pipe 2, the gas production pipe 2 is a heat-insulating sleeve, and the surface is subjected to electroplating anti-corrosion treatment. The reinforced flexible graphite sealing ring 16 is arranged between the gas pipe hanger 15 and the gas pipe large four-way joint 5, the reinforced flexible graphite sealing ring 16 is tightly pressed on the gas pipe hanger 15 through a sealing gland 17 connected with the gas pipe hanger 15 through a screw I4, the lower part of the high-temperature resistant gas pipe head is connected with the technical sleeve 1 through a sealing pipe thread, and the upper part of the high-temperature resistant gas pipe head is connected with the shearing plugging ball valve through a flange; the ball valve core is arranged on a ball valve seat, the ball valve core can rotate by taking a rotating shaft of the ball valve core as an axis, the edge of the ball valve core 29 is a sharp blade, the other side of the ball valve core opposite to the rotating shaft is provided with a hexagonal hole, and the hexagonal hole is in transition fit with a hexagonal shaft of the turntable; the spray assembly consists of a spray pipe hanger 11, a rubber core 12, a gland 13 and a spray pipe 7, and the lower end of the spray pipe 7 is provided with randomly distributed water holes 701. The three-way production port 8 and the spray pipe hanger 11 are sealed by a metal sealing ring 3, and the three-way production port 8 is connected with a manual and hydraulic integrated flat gate valve II32 by a flange; two optical fiber downward-entering channels 801 are arranged above the production outlet tee joint 8 and are provided with two optical fiber downward-entering channel high-temperature sealing structures, each high-temperature sealing structure is composed of a flexible graphite gasket 9 and a hollow hexagonal screw 10, the hollow hexagonal screw 10 is installed in the corresponding optical fiber downward-entering channel 801 on the production outlet tee joint 8 through threaded connection, the flexible graphite gasket 9 is tightly pressed through screwing the hollow hexagonal screw 10 to enable the high-temperature sealing structures to work, the rubber core 12 is a conical rubber core which is made of high-temperature-resistant fluororubber and provided with a middle opening, the taper of the inner wall 1301 of the gland is the same as that of the outer wall of the rubber core, particularly, the diameter of the bottom of the rubber core 12 is slightly larger than that of the inner wall 1301 of the gland, the gland 13 is fixedly installed on the spray pipe hanger 11 through screwing a screw II 19. Cinder filter is by filter tube 23, filter screen I20, filter screen II21, filter screen III22, baffle 26 and rectangle sealing washer 27 are constituteed, filter screen I20, filter screen II21, filter screen III22 mesh number reduces in proper order, the one end that is close to the coal tar scrubber is the filter screen I20 that mesh number is the most, filter tube 23 one side is equipped with rectangular hole 2301, be equipped with sealed step 2302 that is used for the installation of rectangle sealing washer 27 along rectangular hole 2301, rectangular hole 2301 both sides are equipped with blind hole screw thread 2303 respectively, filter tube 23 inside is equipped with three equidistant distribution's the groove 2304 that is used for the filter screen installation. The coal cinder filter is connected with the coal tar washer through a flange; the coal tar scrubber comprises a gas collecting pipe 24, a one-way valve I18 and a one-way valve II25, wherein a water inlet 2401 is arranged on the upper side of the gas collecting pipe 24, the water inlet 2401 is connected with a water inlet one-way valve II25 through a sealing pipe thread, ammonia water can be injected through the one-way valve II25, a water outlet 2402 is arranged on the lower side of the gas collecting pipe 24, and the water outlet 2402 is connected with a water outlet one-way valve I18 through a sealing pipe thread. The working process of the invention is as follows:
the working state I is as follows: in an initial state, all valves and shearing plugging ball valves are in a closed state, the outlet end of a coal tar scrubber is connected with a pipeline, before ignition of an underground coal gasification furnace, nitrogen is injected into a technical sleeve and a gas production pipe through manual hydraulic integrated flat gate valves I on two sides of a high-temperature-resistant gas pipe head to insulate heat, after a heat insulation annular space is formed, the manual hydraulic integrated flat gate valves I on two sides of the high-temperature-resistant gas pipe head are closed, a spray pipe penetrates through a through hole in the middle of a rubber core, and a screw II connecting a gland and a spray pipe hanger is screwed down to enable a rubber core to be extruded by the inner wall of the gland, so that dynamic sealing of the spray pipe is realized; after going into optic fibre under the passageway from optic fibre, open and cut shutoff ball valve, go into required height with shower and optic fibre monitor under, begin to pour into the cooling water into through the shower, open check valve I and check valve II, pour into the aqueous ammonia to the discharge pipe into from check valve II, open the integral type plate gate valve II that surges with output mouth tee junction's hand, open and accomplish the back, pour into fuel into from the injection well and ignite to the shaft bottom, coal underground gasification begins to operate. Cinder particles in the well head output gas are detached when passing through a cinder filter, when passing through a coal tar scrubber, ammonia gas is volatilized by heating of the well head output gas, thereby heat in the well head output gas is taken away, the flow of the ammonia water is adjusted in real time according to the gas production monitored by an optical fiber monitor which goes in, the well head output gas is cooled to a certain temperature to condense and separate out coal tar in the well head output gas, at the moment, the amino in the ammonia water is completely volatilized, only unvaporized water is left, after the coal tar is separated out, the coal tar is discharged from a one-way valve I together with the remaining water.
And a second working state: after using a period of time, when cinder filter effect is not good, then need change the filter screen, only need temporarily close hand hydraulic drive integral type plate valve II, the baffle is pulled down to the screw III of installation baffle, can change the filter screen, opens hand hydraulic drive integral type plate valve II again after finishing changing, can begin gasification again.
And a third working state: when the rubber core sealing effect is poor and the rubber core needs to be replaced, the spraying pipe and the optical fiber monitor are lifted to the position above the shearing and plugging ball valve, then the shearing and plugging ball valve is closed temporarily, the spraying pipe is completely pulled out of the rubber core, the screw II for mounting the pressing cover is dismounted to take out the pressing cover and the old rubber core, then the spraying pipe sequentially penetrates through the pressing cover and the middle hole of the new rubber core, the shearing and plugging ball valve can be opened after the pressing cover is mounted to compress the rubber core to form dynamic sealing, and gasification is continued.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. The invention relates to a multifunctional production well wellhead device for underground coal gasification, which comprises a high-temperature-resistant gas pipe head, a shearing plugging ball valve, a spraying assembly, a coal cinder filter and a coal tar scrubber, wherein the high-temperature-resistant gas pipe head is connected with the shearing plugging ball valve; the high-temperature-resistant gas pipe head is composed of a large gas pipe four-way (5), a manual-hydraulic integrated flat gate valve I (14), a gas pipe hanger (15), a sealing gland (17) and a reinforced flexible graphite sealing ring (16), and through holes in two sides of the large gas pipe four-way (5) are connected with hand liquid through flangesMove integral type plate valve I (3), gas pipe hanger (15) are installed and are realized radially fixedly on big cross (5) inside step I (501), gas pipe hanger (15) pass through threaded connection with gas production pipe (2), reinforcing flexible graphite sealing washer (16) are installed between gas pipe hanger (15) and big cross (5) of gas pipe, gas pipe hanger (15) are through screw
(4) The reinforced flexible graphite sealing ring (16) is pressed on the gas pipe hanger (15) by a connected sealing gland (17) to realize sealing, the lower part of the high-temperature resistant gas pipe head is connected with the technical sleeve (1) through a sealing pipe thread, and the upper part of the high-temperature resistant gas pipe head is connected with the shearing plugging ball valve through a flange; the shearing plugging ball valve consists of a valve seat (6), a ball valve core (29), a valve body (30) and a rotary table (31); the spraying assembly consists of a spraying pipe hanger (11), a rubber core (12), a gland (13) and a spraying pipe (7), an output port tee joint (8) and the spraying pipe hanger (11) are sealed by a metal sealing ring (3), and the output port tee joint (8) is connected with a manual-hydraulic integrated flat gate valve II (32) by a flange; the coal cinder filter consists of a filter pipe (23) and a filter screen
(20) Filter screen
(21) Filter screen
(22) A baffle plate (26) and a rectangular sealing ring (27), the coal cinder filter is connected with the coal tar scrubber through a flange, and the coal tar scrubber is composed of a gas collecting pipe (24) and a one-way valve
(18) And a check valve
(25) And (4) forming.
2. The well head device of the multifunctional production well for underground coal gasification of the claim 1, characterized in that two optical fiber feeding channels (801) are arranged above the three-way (8) of the output port and a high-temperature sealing structure of the two optical fiber feeding channels is installed, the high-temperature sealing structure is composed of a flexible graphite gasket (9) and a hollow hexagonal screw (10), the hollow hexagonal screw (10) is connected with the optical fiber feeding channels (801) installed on the three-way (8) of the output port through threads, and the high-temperature sealing structure works by screwing the hollow hexagonal screw (10) to tightly press the flexible graphite gasket (9).
3. The multifunctional production well head device for underground coal gasification of claim 1, wherein the rubber core (12) is a conical rubber core with a hole in the middle, the taper of the inner gland wall (1301) is the same as that of the outer gland wall, particularly, the diameter of the bottom of the rubber core (12) is slightly larger than that of the inner gland wall (1301), the gland (13) is fixedly installed on the spray pipe hanger (11) by screwing a screw (19) during installation, and the inner gland wall (1301) presses the compressed rubber core (12) against the spray pipe (7).
4. The well head device of the multifunctional production well for the underground coal gasification of the claim 1 is characterized in that the ball valve core (29) is installed on the ball valve seat (6), the ball valve core (29) can rotate by taking a rotating shaft (2901) of the ball valve core as an axis, the edge (2902) of the ball valve core (29) is a sharp knife edge, the other side of the ball valve core (29) opposite to the rotating shaft (2901) is provided with a hexagonal hole (2903), and the hexagonal hole (2903) is in transition fit with a hexagonal shaft (3101) of the rotary disc (31).
5. A multifunctional production well wellhead device for underground coal gasification as claimed in claim 1 wherein the screen is of the type that can be used for the production of coal
(20) Filter screen
(21) Filter screen
(22) The mesh number is reduced in sequence, and the end close to the coal tar washer is the filter screen with the largest mesh number
（20）。
6. The wellhead device of the multifunctional production well for the underground gasification of the coal as claimed in claim 1, wherein one side of the filter pipe (23) is provided with a rectangular hole (2301), a sealing step (2302) for installing the rectangular sealing ring (27) is arranged along the rectangular hole (2301), blind hole threads (2303) are respectively arranged on two sides of the rectangular hole (2301), and three grooves (2304) which are distributed at equal intervals and used for installing the filter screen are arranged in the filter pipe (23).
7. The well head device of the multifunctional production well for the underground coal gasification of the claim 1, characterized in that the upper side of the gas collecting pipe (24) is provided with a water inlet (2401), the water inlet (2401) is connected with a water inlet one-way valve through a sealing pipe by screw thread
(25) Can pass through a one-way valve
(25) The ammonia water is injected, the lower side of the gas collecting pipe (24) is provided with a water outlet (2402), and the water outlet (2402) is connected with a water outlet one-way valve through a sealing pipe thread
（18）。
8. A multifunctional production well wellhead device for underground coal gasification according to claim 1, characterized in that the lower end of the spray pipe (7) is provided with randomly distributed water holes (701).
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| CN114482973A (en) * | 2021-12-31 | 2022-05-13 | 中国石油天然气集团有限公司 | Gas production method for underground coal gasification and wellhead device of production well |
| CN114526047A (en) * | 2021-12-31 | 2022-05-24 | 中国石油天然气集团有限公司 | Underground coal gasification method and system, injection wellhead device and related application |
| CN114482973B (en) * | 2021-12-31 | 2024-05-03 | 中国石油天然气集团有限公司 | Gas production method for underground coal gasification and wellhead device of production well |
| CN114526047B (en) * | 2021-12-31 | 2024-05-17 | 中国石油天然气集团有限公司 | Underground coal gasification method and system, injection wellhead device and related applications |
| CN116699698A (en) * | 2023-08-07 | 2023-09-05 | 大庆信辰油田技术服务有限公司 | Optical fiber permanent monitoring equipment and method for gas storage well |
| CN116699698B (en) * | 2023-08-07 | 2023-10-03 | 大庆信辰油田技术服务有限公司 | Optical fiber permanent monitoring equipment and method for gas storage well |
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