CN113266334A - Oil shale in-situ mining underground backwashing sieving separation device - Google Patents
Oil shale in-situ mining underground backwashing sieving separation device Download PDFInfo
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- CN113266334A CN113266334A CN202110728098.2A CN202110728098A CN113266334A CN 113266334 A CN113266334 A CN 113266334A CN 202110728098 A CN202110728098 A CN 202110728098A CN 113266334 A CN113266334 A CN 113266334A
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- Prior art keywords
- safety valve
- backwashing
- short circuit
- filter screen
- retention
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The invention discloses an underground backwashing sieving and separating device for in-situ mining of oil shale, which belongs to the field of unconventional energy for in-situ mining of oil shale and comprises a guide system, a connecting system and a sieving backwashing system, wherein irregular oil shale particles are sieved in three stages, a first stage sieving is a spiral baffle plate, a lower retention short circuit annular space in a lower retention short circuit forms a second stage sieving, and a joint cutting filter screen forms a third stage sieving; through a backwashing system, ground equipment injects gas back to an oil pipe in a production well, oil shale particles sieved at the second stage in an annular gap of a lower retention short joint are washed, and the oil shale particles sieved at the third stage between a slit filter screen and a valve seat of a safety valve are opened through the safety valve to complete backwashing; the problem that the pressure fluctuation of oil gas production is too large and the water hammer effect on an oil pipe and ground equipment is caused by too high gas outlet pressure can be effectively solved through the open flow of the slurry safety valve, and the accident rate of the ground and underground equipment is reduced.
Description
Technical Field
The invention relates to the field of unconventional energy sources for in-situ exploitation of oil shale, in particular to an underground backwashing and sieving separation device for in-situ exploitation of oil shale.
Background
In recent years, the exploration force of unconventional energy sources such as oil shale, oil sand, rich coal, coal bed gas and shale gas is increased by the nation, and the unconventional oil and gas resources have huge reserves, particularly the oil shale has wide exploitation prospects. The Jilin university develops the in-situ mining technology in the rural area and the rest area of the Songliao basin successively to produce shale oil gas, and the feasibility of underground in-situ mining is verified.
The oil shale in-situ mining technology is that heating is carried out on the ground or underground to realize heat injection mining on an oil shale target layer, the oil shale target layer realizes reservoir transformation through a hydraulic fracturing technology, a heat carrier heats an oil shale target layer section in a heat conduction and convection mode, and kerogen in the oil shale reaches the cracking temperature and is extracted to the ground surface along with the heat carrier.
The Jilin university discovers that kerogen in oil shale is further cracked along with the increase of mining time and a flow guide channel is further enlarged in the process of carrying out pilot tests on the site of the agricultural security and remaining in-situ mining tests, part of irregular large oil shale particles are taken out of an oil shale target layer and are transferred to a production well in the process of transferring a high-pressure carrier, the irregular oil shale particles are transferred to an earth surface pipeline along with an oil pipe and oil gas, the pressure fluctuation of the produced oil in the production well is large along with the upward movement of the oil gas, and the water hammer effect is obvious; irregular oil shale particles scour an oil pipe at a high speed, so that the oil pipe is abraded, high-temperature oil gas seriously corrodes an oil pipe string, meanwhile, the oil shale particles block the pipeline at a pipeline elbow and a pressure reducing valve, and the blocked particles have great damage to a valve; the product mixture containing oil sludge is further deposited in the pipeline to seriously obstruct the exploitation, and the temperature of oil gas products of the extraction well is too high, so that the conventional separation device is difficult to meet the working condition.
The device for exploring underground sieving and separating at the present stage mainly comprises: the movable filter screen type sand control screen pipe is used for steam thermal drive thickened oil huff and puff, a safety valve spring in the device is directly contacted with the thickened oil in a high-temperature environment in an injection and production well, high-temperature fatigue damage of the safety valve spring bonding is easily caused in field practice, the failure of the device is easily caused, and the underground accident handling time is prolonged.
Disclosure of Invention
The purpose of the invention is: in order to solve the problems in the background technology, the underground backwashing and sieving separation device for oil shale in-situ mining is simple in structure, convenient, feasible, durable and easy to install, and stable production of oil gas is realized.
The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides an oil shale normal position exploitation back flush sieving separation device in pit, includes: a guiding system, a connecting system and a sieving backwashing system, wherein:
the guide system comprises a first centralizer and a second centralizer, and the first centralizer and the second centralizer are consistent in structure and are of six-petal hollow structures;
the connecting system comprises an oil pipe, a first short circuit, an upper retention short circuit, a lower retention short circuit and a second short circuit, and the oil pipe is in threaded connection with the upper end of the first centralizer; the upper end of the first short circuit is in threaded connection with the lower end of the first centralizer, and the lower end of the first short circuit is in threaded connection with the upper end of the upper retention short circuit; the lower end of the upper retention short joint is in threaded connection with a safety valve seat; the upper end of the lower retention short joint is in threaded connection with the lower end of the safety valve seat, the lower end of the lower retention short joint is in threaded connection with the upper end of the one-way valve seat, the lower retention short joint consists of an outer shell and a retention seat arranged inside the outer shell, and a gap is formed between the retention seat and the outer shell except the direct connection part of the retention seat and the outer shell; the upper end of the second short joint is in threaded connection with the rock debris settling tank, and the lower end of the second short joint is in threaded connection with the second centralizer;
the sieving backwashing system comprises a slurry safety valve system, a retention system, a one-way valve system and a rotary separation system, wherein the slurry safety valve system comprises an adjusting valve cover, a guide sleeve, a safety valve spring, a backwashing disc, a discharge nozzle and a safety valve body, an internal space formed after the adjusting valve cover is in threaded connection with the safety valve body is a valve cavity, the guide sleeve, the safety valve spring and the backwashing disc are arranged in the valve cavity, the upper end of the guide sleeve is in static pressure contact with the adjusting valve cover, the lower end of the guide sleeve is in static pressure contact with the safety valve body, and meanwhile, the guide sleeve is in static pressure contact with the safety valve spring sleeved inside the guide sleeve; the outer part of the recoil disc is in static pressure contact with the inner wall of the safety valve body to form sealing, and the inner part of the recoil disc is in static pressure contact with a safety valve spring; the lower end of the safety valve body is of a flange structure, the safety valve body is connected with a safety valve seat flange, a steel gasket is arranged between the safety valve body and the flange of the safety valve seat, and sealing is formed by static pressure contact of a double-end screw; the spray nozzle is connected with the safety valve body through threads to form sealing; the retention system comprises a joint-cutting filter screen, a safety valve seat and a graphite gasket, wherein the safety valve seat is positioned outside the joint-cutting filter screen, and an annular space is formed between the safety valve seat and the joint-cutting filter screen; the number of the graphite washers is two, the two graphite washers are respectively arranged on the upper surface and the lower surface of the joint cutting filter screen and are respectively in static pressure contact with the upper retention short circuit and the lower retention short circuit; the joint-cutting filter screen is a hollow cylinder structure which is enclosed by screen meshes and has two closed ends, the top surface and the side surface of the joint-cutting filter screen are both provided with a joint cutting, the upper end of the joint-cutting filter screen is in static pressure contact with the interior of the upper retention short circuit through a graphite gasket positioned on the upper part of the joint-cutting filter screen to form sealing, and the lower end of the joint-cutting filter screen is in static pressure contact with the retention seat of the lower retention short circuit through a graphite gasket positioned on the lower part of the joint-cutting filter screen to form sealing; the check valve body system comprises a valve pad, a check valve spring, a valve core and a check valve seat, and the valve pad is respectively in static pressure contact with the check valve spring and the check valve seat; the one-way valve spring is in static pressure contact with the valve core; the valve core is in static pressure contact with the valve seat of the one-way valve, and four holes are formed in the middle of the valve core; a filter screen is arranged at the inlet of the one-way valve seat; the rotary system comprises a rock debris settling tank and a spiral baffle plate, the upper end of the rock debris settling tank is in threaded connection with the lower end of the one-way valve seat, the lower end of the rock debris settling tank is in threaded connection with a second short joint, the rock debris settling tank is sleeved outside the spiral baffle plate, the upper part of the rock debris settling tank is obliquely arranged towards the spiral baffle plate to form an inclined part, and an opening is formed in the inclined part of the rock debris settling tank, which is close to one side of the spiral baffle plate; the spiral baffle plate is in static pressure contact with the rock debris settling tank, and the lower part of the spiral baffle plate is in welded connection with the second short joint.
Further, first centralizer and second centralizer are the split type structure that hollow cylinder cut apart the formation, are provided with the radius angle between two adjacent lamellas.
Further, the outer diameter of the oil pipe is 50 mm.
Further, the distance between the position fixing seat and the outer shell to form a gap is less than or equal to 3 mm.
Further, the mesh size of the screen mesh of the slitting filter screen is 20 meshes.
Further, the thread pitch of the spiral baffle plate is 30 mm.
Further, the filter screen is a 5mm aperture screen.
Through the design scheme, the invention can bring the following beneficial effects: the invention provides an underground backwashing sieving and separating device for in-situ mining of oil shale, which can effectively prevent irregular oil shale particles falling off along with high-speed oil gas migration in an oil shale target layer from abrading an oil pipe and solve the problem of blockage and damage of ground pipeline equipment by designing the sieving and separating device at the tail end of the oil pipe; the underground backwashing sieving and separating device forms three-stage sieving on irregular oil shale particles, the first-stage sieving is a spiral baffle plate, a space in an annular space of a lower retention short circuit in the lower retention short circuit forms two-stage sieving, and a joint cutting filter screen forms three-stage sieving; through a backwashing system, ground equipment injects gas back to an oil pipe in a production well, oil shale particles sieved at the second stage in an annular gap of a lower retention short joint are washed, and the oil shale particles sieved at the third stage between a slit filter screen and a valve seat of a safety valve are opened through the safety valve to complete backwashing; the problem that the pressure fluctuation of oil gas production is too large and the water hammer effect on an oil pipe and ground equipment is caused by too high gas outlet pressure can be effectively solved through the open flow of the slurry safety valve, and the accident rate of the ground and underground equipment is reduced.
In conclusion, the invention adopts a back-flushing sieving separation design to reduce the abrasion and damage of the underground irregular oil shale particles to oil pipes, ground pipelines and equipment, the back-flushing design can discharge the sieved oil shale particles, keep an oil-gas migration channel unblocked, and the mud safety valve design can buffer the conditions of abnormal rising of underground pressure and large fluctuation, thereby realizing stable production of oil gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to the right, and in which:
FIG. 1 is a schematic sectional view of the overall structure of an in-situ mining downhole backwashing and screening separation device for oil shale;
FIG. 2 is a schematic diagram of the upper structure of the oil shale in-situ mining downhole backwashing and screening separation device;
FIG. 3 is a schematic diagram of the middle structure of the underground backwashing and screening separation device for in-situ oil shale mining;
FIG. 4 is a schematic view of the lower structure of the oil shale in-situ mining downhole backwashing and screening separation device;
FIG. 5 is a top view of a first centralizer in the oil shale in-situ mining downhole backwash screen separation device;
FIG. 6 is a top view of an upper retention short circuit in the oil shale in-situ mining downhole backwashing-sieving separation device;
FIG. 7 is a top view of a lower retention short circuit in the oil shale in-situ mining downhole backwashing-sieving separation device;
FIG. 8 is a three-dimensional schematic view of an upper retention short circuit in the oil shale in-situ mining downhole backwashing sieving separation device;
FIG. 9 is a three-dimensional schematic view of a lower retention short circuit in the oil shale in-situ mining downhole backwashing-sieving separation device;
FIG. 10 is a three-dimensional schematic view of a kerf filter screen in the oil shale in-situ mining downhole backwashing and screening separation device;
FIG. 11 is a schematic diagram illustrating a sieving and separating principle of the downhole backwashing sieving and separating device for in-situ oil shale mining;
FIG. 12 is a schematic diagram of the back-flushing principle of the oil shale in-situ mining downhole back-flushing sieving separation device.
The respective symbols in the figure are as follows: 1-an oil pipe; 2-a wellbore; 3-a first centralizer; 4-first short circuit; 5-fixing short circuit on the upper part; 6-cutting a seam and filtering a screen; 7-safety valve seat; 8-graphite gaskets; 9-lower retention short circuit; 901-lower retention short circuit annular space; 902-a position-retaining seat; 10-a rock debris settling tank; 11-a helical baffle; 12-a second centralizer; 13-adjusting the valve cover; 14-a guide sleeve; 15-safety valve spring; 16-a recoil disc; 17-blowing a nozzle; 18-safety valve body; 19-a valve pad; 20-a one-way valve spring; 21-a valve core; 22-one-way valve seat; 23-second short circuit; 24-trace.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention. In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and that the features defined as "first" and "second" do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11 and fig. 12, the present invention provides an in-situ mining downhole backwashing screening separation device for oil shale, comprising: a guiding system, a connecting system and a sieving backwashing system, wherein:
the guiding system comprises a first centralizer 3 and a second centralizer 12, the upper end of the first centralizer 3 is in threaded connection with the oil pipe 1, and the lower end of the first centralizer 3 is in threaded connection with the upper end of the first short joint 4; the second centralizer 12 is in threaded connection with the lower end of the second short joint 23; the first centralizer 3 and the second centralizer 12 play a role in preventing the collision damage of the middle screening backwashing system and the shaft 2 in the process of descending the well by the equipment; the first centralizer 3 and the second centralizer 12 are consistent in structure and are both of a six-petal hollow structure, and particularly the first centralizer 3 and the second centralizer 12 are of split structures formed by dividing a hollow cylinder, so that the annular space between the shaft 2 and the oil pipe 1 is ensured to be communicated with the central pipe column of the oil pipe 1, a fillet is arranged between every two adjacent petals, and oil shale particles are prevented from being clamped into gaps; it should be noted that, in the present invention, since the first centralizer 3 and the second centralizer 12 are identical in structure, only the top view of the first centralizer 3 in the oil shale in-situ mining downhole backwashing and screening separation device is shown in the drawings of the present invention, and is shown in detail in fig. 5.
The connecting system comprises an oil pipe 1, a first short joint 4, an upper retention short joint 5, a lower retention short joint 9 and a second short joint 23, wherein the oil pipe 1 is a conventional oil drilling oil pipe, the outer diameter of the oil pipe 1 is 50mm, the inner diameter of a shaft 2 is 244mm, the upper end of the upper retention short joint 5 is in threaded connection with the lower end of the first short joint 4, and the lower end of the upper retention short joint 5 is in threaded connection with a safety valve seat 7; the upper end of the lower retention short joint 9 is in threaded connection with the lower end of the safety valve seat 7, and the lower end of the lower retention short joint 9 is in threaded connection with the one-way valve seat 22; the lower retention short circuit 9 comprises an outer shell and a retention seat 902 arranged inside the outer shell, a gap is formed between the retention seat 902 and the outer shell except a direct connection part with the outer shell, the gap is a lower retention short circuit annular gap 901 in fig. 7 and 9, and the distance between the lower retention short circuit annular gap 901 is less than or equal to 3 mm; the upper end of the second short joint 23 is in threaded connection with the debris settling tank 10, and the lower end of the second short joint 23 is in threaded connection with the second centralizer 12.
The sieving backwashing system comprises a slurry safety valve system, a retention system, a one-way valve system and a rotary separation system, wherein the slurry safety valve system comprises an adjusting valve cover 13, a guide sleeve 14, a safety valve spring 15, a backwashing disc 16, a blow-off nozzle 17 and a safety valve body 18, the internal space formed after the adjusting valve cover 13 and the safety valve body 18 are in threaded connection is a valve cavity, the guide sleeve 14, the safety valve spring 15 and the backwashing disc 16 are arranged in the valve cavity, the upper end of the guide sleeve 14 is in static pressure contact with the adjusting valve cover 13, the lower end of the guide sleeve 14 is in static pressure contact with the safety valve body 18, and meanwhile, the guide sleeve 14 is in static pressure contact with the safety valve spring 15 sleeved inside the guide sleeve 14; the outer part of the recoil disc 16 is in static pressure contact with the inner wall of the safety valve body 18 to form a seal, and the inner part of the recoil disc 16 is in static pressure contact with the safety valve spring 15; the lower end of the safety valve body 18 is of a flange structure, the safety valve body 18 is in flange connection with the safety valve seat 7, and a steel gasket is arranged between the safety valve body 18 and the flange of the safety valve seat 7 and forms sealing through static pressure contact of a double-end screw; the discharging nozzle 17 is connected with the safety valve body 18 through threads to form sealing; the retention system comprises a joint-cutting filter screen 6, a safety valve seat 7 and a graphite gasket 8, wherein the safety valve seat 7 is positioned outside the joint-cutting filter screen 6, and an annular space is formed between the safety valve seat 7 and the joint-cutting filter screen 6; the number of the graphite washers 8 is two, and the two graphite washers 8 are respectively arranged on the upper surface and the lower surface of the joint-cutting filter screen 6 and are respectively in static pressure contact with the upper retention short circuit 5 and the lower retention short circuit 9; the lancing filter screen 6 is a hollow cylinder structure enclosed by screen meshes and with two closed ends, the top surface and the side surface of the lancing filter screen 6 are both provided with a lancing, the lancing is used for sieving oil shale particles with more than 20 meshes, the mesh size of the screen mesh of the lancing filter screen 6 is 20 meshes, the maximum passing diameter of the screen mesh of the lancing filter screen 6 is 20 meshes, the upper end of the lancing filter screen 6 is in static pressure contact with the interior of the upper retention short circuit 5 through a graphite gasket 8 positioned at the upper part of the lancing filter screen 6 to form sealing, and the lower end of the lancing filter screen 6 is in static pressure contact with a retention seat 902 of the lower retention short circuit 9 through a graphite gasket 8 positioned at the lower part of the lancing filter screen 6 to form sealing; the check valve system comprises a valve pad 19, a check valve spring 20, a valve core 21 and a check valve seat 22, wherein the valve pad 19 is respectively in static pressure contact with the check valve spring 20 and the check valve seat 22; the check valve spring 20 is in static pressure contact with the valve core 21; the valve core 21 is in static pressure contact with the one-way valve seat 22, four holes are formed in the middle of the valve core 21, oil-gas-water products enter the oil pipe 1 through the valve core 21, the upper end of the one-way valve seat 22 is in threaded connection with the lower fixed short joint 9, the lower end of the one-way valve seat 22 is in threaded connection with the upper end of the debris settling tank 10, a filter screen is arranged at the inlet of the one-way valve seat 22, and the filter screen is a 5 mm-diameter screen mesh; the spiral separation system comprises a rock debris settling tank 10 and a spiral baffle plate 11, the upper end of the rock debris settling tank 10 is in threaded connection with the lower end of a one-way valve seat 22, the lower end of the rock debris settling tank 10 is in threaded connection with a second short joint 23, the rock debris settling tank 10 is sleeved outside the spiral baffle plate 11, the upper part of the rock debris settling tank 10 is obliquely arranged towards the spiral baffle plate 11 to form an inclined part, and an opening is formed in the inclined part of the rock debris settling tank 10 close to one side of the spiral baffle plate 11; the spiral baffle plate 11 is in static pressure contact with the debris precipitation tank 10, and the lower part of the spiral baffle plate 11 is connected with a second short joint 23 in a welding mode.
Furthermore, the mud safety valve system can bear the temperature range of 0-220 ℃ and the pressure regulating range of 0-2.5 MPa.
Further, the lower retention short circuit annular space 901 of the lower retention short circuit 9 has a maximum passing grain size of 3 mm.
Further, the pitch of the spiral baffle 11 is 30 mm.
All parts in the invention are high temperature resistant, and the underground operation environment of the production well is satisfied.
FIG. 11 shows a schematic diagram of the sieving separation principle of the downhole back-flushing sieving separation device for in-situ oil shale mining; fig. 12 shows a back flushing principle schematic diagram of the oil shale in-situ mining downhole back flushing sieving separation device, and the specific flow tracks are shown in detail in a trace line 24 in fig. 11 and 12.
The process of carrying out underground construction operation by adopting the underground backwashing and screening separation device for oil shale in-situ mining comprises the following steps:
step one, completing installation of the underground backwashing sieving separation device
The tail end of an oil pipe 1 is screwed with the upper end thread of a first centralizer 3, the lower end of the first centralizer 3 is screwed with the upper end thread of a first short joint 4, the upper end of an upper retention short joint 5 is screwed with the lower end thread of the first short joint 4, a graphite gasket 8 is placed inside the upper retention short joint 5, a joint cutting filter screen 6 is in static pressure contact with the graphite gasket 8 to prevent displacement and cause untight sealing, a safety valve seat 7 is arranged outside the joint cutting filter screen 6, the safety valve seat 7 is in threaded connection with the upper retention short joint 5 to complete the sealing of the upper end of the joint cutting filter screen 6, the graphite gasket 8 is placed in a fixing seat 902 of a lower retention short joint 9, and the threads are screwed through a pipe tongs tool to complete the sealing of the lower end of the joint cutting filter screen 6; a steel gasket is placed between a safety valve body 18 and a flange at the upper end of a safety valve seat 7 of the slurry safety valve system assembly, a double-stud bolt is screwed tightly to form static pressure sealing between the safety valve body 18 and the safety valve seat 7, a one-way valve system assembly is adopted, a pipe wrench tool is used for completing threaded connection between a one-way valve seat 22 and a lower retention short joint 9, a rock debris settling tank 10 is connected with the one-way valve seat 22 in a threaded manner, after a spiral baffle plate 11 and a second short joint 23 are welded, a pipe wrench is used for screwing the upper end of the second short joint 23 and the rock debris settling tank 10 in a threaded manner, the lower end of the second short joint 23 and a second centralizer 12 in a threaded manner, and the main body installation of the underground backwashing sieving separation device is completed;
secondly, the oil pipe 1 and the underground backwashing sieving and separating device main body are lowered into a shaft 2 through a crane, the adjacent oil pipe 1 is screwed by a pipe wrench, the sieving backwashing system is prevented from colliding and damaging with the shaft 2 through a first centralizer 3 and a second centralizer 12, the oil pipe 1 is lowered section by section, the underground backwashing sieving and separating device main body is conveyed to an underground designated position, and the connection work of a ground wellhead, a pipeline and equipment is completed;
thirdly, after in-situ mining construction, oil gas products and irregular oil shale particles sequentially pass through a second centralizer 12 and a second short joint 23 from the bottom of a well through gaps among the petals of the first centralizer 3 and the second centralizer 12, the oil gas products and the irregular oil shale particles enter the spiral baffle plate 11 together with the oil shale particles, in the ascending process, due to the action of centrifugal force, the oil shale particles are distributed on the side wall of one side, facing the spiral baffle plate 11, of the rock debris settling tank 10 due to density difference and collide at the inclined part of the rock debris settling tank 10, and enter the rock debris settling tank 10 through an opening formed in the upper part of the rock debris settling tank 10 to complete primary screening, the oil gas products and the small particles of the oil shale subjected to primary screening move upwards to a one-way valve, due to the fact that a screen with the diameter of 5mm is arranged in the one-way valve, the filtering effect is achieved, the oil gas products are prevented from being insufficiently divided, the one-way valve spring 20 is compressed, and the valve core 21 is ejected, the oil gas enters the lower retention short circuit 9 through a hole in the middle of the valve core 21, irregular oil shale particles with the size of more than 3mm are sieved through an annular space 901 of the lower retention short circuit to complete second-stage sieving, the sieved oil gas is filtered by an annular space between a safety valve seat 7 and a joint-cutting filter screen 6 to form irregular oil shale particles with the size of more than 20 meshes, an oil gas product after filtering is further filtered by the joint-cutting filter screen 6, the filtered oil gas product is transported to a ground pipeline along with the oil pipe 1 to be collected, third-stage sieving is completed, and sieving and separating of the whole oil gas product are completed;
fourthly, after the underground is screened and separated for a period of time, the part of a safety valve seat 7 communicated with a safety valve body 18 is communicated, the annular space between the safety valve seat 7 and a lancing filter screen 6 is enriched with irregular oil shale particles of more than 20 meshes, gas of more than 2.5Mpa is injected into the oil pipe 1 through ground gas injection equipment, a valve core 21 is in static pressure contact with a one-way valve seat 22 to complete a closed circuit, the injected gas is higher than the limit pressure of a slurry safety valve system, a safety valve spring 15 is compressed under stress, a recoil disc 16 is moved upwards, the irregular oil shale particles of more than 20 meshes are moved out of the annular space between a shaft 2 and the oil pipe 1 through a blowout nozzle 17 of the slurry safety valve system to complete underground backwashing construction, and then production is continued;
fifthly, in-situ mining is completed, the oil pipe 1 is lifted, the underground backwashing sieving separation device is extracted to the ground, the device is cleaned, the abrasion condition of the part is checked, and the abrasion part replacement work is completed;
as a supplement to the fourth step, when the pressure of the oil gas in the production well is abnormally fluctuated and the pressure is increased, the oil gas pressure fluctuation can cause the oil gas in the well to generate a water hammer effect in the migration of the oil pipe 1, and the oil pipe 1 and ground equipment are damaged; when the pressure of the inner cavities of the safety valve seat 7 and the safety valve body 18 is greater than 2.5Mpa, the safety valve spring 15 is compressed, the recoil disc 16 moves upwards, the overpressure oil gas product moves to the annulus of the shaft 2 through the discharge nozzle 17, the oil gas pressure entering the oil pipe 1 is guaranteed not to be higher than 2.5Mpa, the oil gas pressure stabilization is guaranteed to move upwards, and stable production is achieved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an oil shale normal position exploitation back flush sieving separation device in pit which characterized in that includes: a guiding system, a connecting system and a sieving backwashing system, wherein:
the guide system comprises a first centralizer (3) and a second centralizer (12), and the first centralizer (3) and the second centralizer (12) are consistent in structure and are of six-petal type hollow structures;
the connecting system comprises an oil pipe (1), a first short circuit (4), an upper retention short circuit (5), a lower retention short circuit (9) and a second short circuit (23), and the oil pipe (1) is in threaded connection with the upper end of the first centralizer (3); the upper end of the first short circuit (4) is in threaded connection with the lower end of the first centralizer (3), and the lower end of the first short circuit (4) is in threaded connection with the upper end of the upper retention short circuit (5); the lower end of the upper retention short joint (5) is in threaded connection with a safety valve seat (7); the upper end of the lower retention short circuit (9) is in threaded connection with the lower end of the safety valve seat (7), the lower end of the lower retention short circuit (9) is in threaded connection with the upper end of the one-way valve seat (22), the lower retention short circuit (9) consists of an outer shell and a retention seat (902) arranged inside the outer shell, and a gap is formed between the retention seat (902) and the outer shell except the direct connection part with the outer shell; the upper end of the second short joint (23) is in threaded connection with the debris settling tank (10), and the lower end of the second short joint (23) is in threaded connection with the second centralizer (12);
the sieving backwashing system comprises a slurry safety valve system, a retention system, a one-way valve system and a rotary separation system, the slurry safety valve system comprises an adjusting valve cover (13), a guide sleeve (14), a safety valve spring (15), a backwashing disc (16), a blow-off nozzle (17) and a safety valve body (18), an internal space formed after the adjusting valve cover (13) and the safety valve body (18) are in threaded connection is a valve cavity, the guide sleeve (14), the safety valve spring (15) and the backwashing disc (16) are arranged in the valve cavity, the upper end of the guide sleeve (14) is in static pressure contact with the adjusting valve cover (13), the lower end of the guide sleeve (14) is in static pressure contact with the safety valve body (18), and meanwhile, the guide sleeve (14) is in static pressure contact with the safety valve spring (15) sleeved inside the guide sleeve; the outer part of the recoil disc (16) is in static pressure contact with the inner wall of the safety valve body (18) to form a seal, and the inner part of the recoil disc (16) is in static pressure contact with the safety valve spring (15); the lower end of the safety valve body (18) is of a flange structure, the safety valve body (18) is in flange connection with the safety valve seat (7), and a steel gasket is arranged between the flanges of the safety valve body (18) and the safety valve seat (7) and forms sealing through static pressure contact of a double-end screw; the discharging nozzle (17) is in threaded connection with the safety valve body (18) to form sealing; the retention system comprises a lancing filter screen (6), a safety valve seat (7) and a graphite gasket (8), the safety valve seat (7) is positioned outside the lancing filter screen (6), and an annular space is formed between the safety valve seat (7) and the lancing filter screen (6); the number of the graphite gaskets (8) is two, and the two graphite gaskets (8) are respectively arranged on the upper surface and the lower surface of the joint cutting filter screen (6) and are respectively in static pressure contact with the upper retention short circuit (5) and the lower retention short circuit (9); the kerf filter screen (6) is a hollow cylinder structure enclosed by screen meshes and with two closed ends, both the top surface and the side surface of the kerf filter screen (6) are provided with kerfs, the upper end of the kerf filter screen (6) is in static pressure contact with the interior of the upper retention short circuit (5) through a graphite gasket (8) positioned at the upper part of the kerf filter screen to form sealing, and the lower end of the kerf filter screen (6) is in static pressure contact with a retention seat (902) of the lower retention short circuit (9) through the graphite gasket (8) positioned at the lower part of the kerf filter screen to form sealing; the check valve body system comprises a valve pad (19), a check valve spring (20), a valve core (21) and a check valve seat (22), wherein the valve pad (19) is respectively in static pressure contact with the check valve spring (20) and the check valve seat (22); the one-way valve spring (20) is in static pressure contact with the valve core (21); the valve core (21) is in static pressure contact with the one-way valve seat (22), and four holes are formed in the middle of the valve core (21); a filter screen is arranged at the inlet of the one-way valve seat (22); the spiral separation system comprises a rock debris settling tank (10) and a spiral baffle plate (11), the upper end of the rock debris settling tank (10) is in threaded connection with the lower end of a one-way valve seat (22), the lower end of the rock debris settling tank (10) is in threaded connection with a second short joint (23), the rock debris settling tank (10) is sleeved outside the spiral baffle plate (11), the upper part of the rock debris settling tank (10) is obliquely arranged towards the spiral baffle plate (11) to form an inclined part, and an opening is formed in the inclined part, close to one side of the spiral baffle plate (11), of the rock debris settling tank (10); the spiral baffle plate (11) is in static pressure contact with the rock debris settling tank (10), and the lower part of the spiral baffle plate (11) is connected with a second short joint (23) in a welding mode.
2. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the first centralizer (3) and the second centralizer (12) are split-type structures formed by dividing hollow cylinders, and a fillet is arranged between every two adjacent lobes.
3. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the outer diameter of the oil pipe (1) is 50 mm.
4. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the spacing between the position-fixing seat (902) and the outer shell is less than or equal to 3 mm.
5. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the screen mesh size of the slitting screen (6) is 20 meshes.
6. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the screw pitch of the spiral baffle plate (11) is 30 mm.
7. The oil shale in-situ mining downhole backwashing and screening separation device according to claim 1, wherein: the filter screen is a screen with 5mm aperture.
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| CN202110728098.2A CN113266334B (en) | 2021-06-29 | 2021-06-29 | Oil shale in-situ mining underground backwashing sieving separation device |
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| US20040031608A1 (en) * | 2002-08-16 | 2004-02-19 | Hall Jared C. | Gas-liquid separator positionable down hole in a well bore |
| CN102512860A (en) * | 2011-12-13 | 2012-06-27 | 吉林大学 | Shale oil solid-liquid separator |
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