CN111827944B - Pump-crossing closed circulating heating pipe column - Google Patents
Pump-crossing closed circulating heating pipe column Download PDFInfo
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- CN111827944B CN111827944B CN201910322857.8A CN201910322857A CN111827944B CN 111827944 B CN111827944 B CN 111827944B CN 201910322857 A CN201910322857 A CN 201910322857A CN 111827944 B CN111827944 B CN 111827944B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 239000008236 heating water Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 239000000725 suspension Substances 0.000 claims description 22
- 210000004907 gland Anatomy 0.000 claims description 11
- 239000003129 oil well Substances 0.000 claims description 11
- 239000003921 oil Substances 0.000 abstract description 81
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 239000000295 fuel oil Substances 0.000 abstract description 10
- 238000005485 electric heating Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 description 15
- 239000010779 crude oil Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 241000483002 Euproctis similis Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a cross-pump closed circulation heating pipe column which comprises an oil pumping pipe column and a hollow rod, wherein the lower end of the hollow rod extends into the oil pumping pipe column, the cross-pump closed circulation heating pipe column also comprises a sealing short joint, a tail pipe, a downhole communicating device and a heating water outlet pipe, the upper end of the tail pipe is in threaded connection with the lower end of the sealing short joint, the upper end of the sealing short joint is in threaded connection with the lower end of the oil pumping pipe column, the lower end of the tail pipe is in threaded connection with an inlet of the downhole communicating device, the lower end of the hollow rod extends downwards, penetrates through the oil pumping pipe column and then penetrates through a central channel of the sealing short joint to enter the tail pipe, the hollow rod and the central channel of the sealing short joint are in a sliding sealing state, the lower end of the heating water outlet pipe is in threaded connection with an outlet of the downhole communicating device, and the upper end of the heating water outlet pipe extends out of a well head. The softened water is internally circulated in a closed way, a ground water-mixed pipeline is not required to be laid, water resources are saved, an electric heating device is not required, the heavy oil well can be smoothly opened after the operation is finished, and the phenomena of slow descending of a sucker rod, frequent pipeline blockage and the like do not occur in the production process.
Description
Technical Field
The invention relates to an oil field development and oil extraction process technology, in particular to a pump-crossing closed circulating heating pipe column.
Background
In the thick oil block of the oil field, the thick oil yield is increased year by year, and the thick oil development becomes an important capacity take-over place. But the production viscosity of part of wells is very high and reaches more than 100000mPa.s, so that crude oil in a shaft of the oil well is difficult to lift, and after the oil is found in the oil well, a polish rod slowly descends, and normal production cannot be realized. This is because the produced liquid forms W/O type emulsion, which increases the viscosity of crude oil, causes deterioration of fluidity, and brings many difficulties to the recovery of thick oil.
At present, the thick oil well generally adopts a pump water-adding process, and has the advantage of lower investment cost. The method has the defects of high management difficulty, high restriction by ground conditions, incapability of ensuring the water mixing amount, the water mixing temperature and the water mixing pressure, and incapability of measuring the liquid level by mixing water on a pump.
The electric heating process has the advantages of full-well heating, high heating speed, capability of opening a well after 1-2 hours of heating, quick fault removal and convenient management. The disadvantage is that the electricity consumption of a single well is large.
The hollow rod watering emulsification and viscosity reduction process has the defects that the hollow rod watering process is greatly influenced by the watering water quality, and the rod is scaled and blocked in about 3 months, so that the hollow rod watering emulsification and viscosity reduction process is difficult to popularize on a large scale under the current condition.
The closed circular heating process of hollow rod hot fluid has the advantages of accurate measurement, capacity of lowering the load of the gathering and transportation system and raised system stability; (2) the water is mixed for closed circulation, and the dependence on the system is small; (3) the heating medium is softened water, so that scaling in a water mixing process is avoided. The disadvantages are that (1) two heating furnaces have large consumption of natural gas; (2) a hollow rod is heavy in load and needs to be matched with a 12-type machine or a 700-type belt conveyor; (3) the heating effect is slightly poor, and the requirement of lifting a part of wells can be met; (4) the management difficulty is high.
In conclusion, a thick oil shaft lifting viscosity reduction technology is urgently needed to solve the problem of thick oil exploitation.
Application No.: 201720831444.9 provides a viscous crude viscosity reduction heating device and viscous crude viscosity reduction heating system, relates to the oil development field, and viscous crude viscosity reduction heating device includes current conductor, insulator and heating tube, and the lumen packing of heating tube has the insulator, and the insulator internal fixation has the current conductor, the utility model provides a viscous crude viscosity reduction heating device, current conductor circular telegram produce magnetic field, and the heating tube receives the magnetic line of force effect in magnetic field and produces heat, and overall structure is compact, and it is even to generate heat, and viscous crude viscosity reduction heating system includes viscous crude viscosity reduction heating device, oil pipeline and switch board, and viscous crude viscosity reduction heating device sets up in oil pipeline, is connected with the switch board electricity, and circular telegram back current conductor produces magnetic field, and the magnetic line of force acts on heating tube and crude oil, and crude oil self receives the magnetization, and the heating tube produces even heat and heats crude oil, has reduced viscosity, has reached the purpose that viscous crude oil heated.
Application No.: 201510837567.9 relates to a method and a device for obtaining a shaft temperature field in a hot water circulation heating viscosity reduction process, wherein the method comprises the following steps: determining data parameters; acquiring formation thermal resistance, cement sheath thermal resistance, casing wall thermal resistance, thermal convection liquid thermal resistance between liquid and the inner wall of the casing, thermal convection thermal resistance between air and the inner wall of the casing, thermal conduction thermal resistance between the inner wall and the outer wall of the oil pipe, thermal convection thermal resistance between crude oil and the inner wall of the oil pipe, thermal convection thermal resistance between the inner wall and the outer wall of the hollow rod, thermal convection thermal resistance between hot fluid and the inner wall of the hollow rod, thermal convection thermal resistance between the inner wall and the outer wall of the inner pipe and thermal convection thermal resistance between the hot fluid and the inner pipe by using the data parameters; determining the radial heat loss of the shaft unit in unit length by using thermal resistance information; and determining an inner pipe hot water temperature field, a hollow rod hot water temperature field and a crude oil temperature field in the oil pipe under the condition of forward injection and/or reverse injection by using the radial heat loss of the wellbore unit with unit length.
Application No.: 201110310781.0 relates to a hot water injection circulation viscosity reduction system for ultra-deep and ultra-thick oil exploitation and an application method, belonging to the field of viscosity reduction exploitation of thick oil in oil fields, and comprising a ground circulation system and an underground circulation viscosity reduction system, wherein the ground circulation system is formed by sequentially connecting a clean water tank, a softened water device, a softened water tank, a water supply pump, a magnetization device, a water jacket furnace, a water injection pump and a pressure release valve on a circulation outflow pipeline on a circulation injection pipeline; the underground circulating system is a liquid injection and outflow pipeline consisting of a heat insulation oil pipe annulus, a sleeve annulus and a packer, and an oil extraction production pipeline consisting of an inner oil pipe, the packer, a sieve pipe and a plug. The invention can reduce the viscosity of the thick oil, is beneficial to the exploitation of the ultra-deep and ultra-thick oil, can solve the problems of low effective pumping efficiency, short pump detection period and high energy consumption in the thinning and viscosity reduction process, and has the advantages of low oil extraction cost, easy popularization and application and the like.
Application No.: 201710683780.8 discloses a thickened oil modifying and viscosity reducing method, which comprises the following steps: arranging an injection-production well pattern in a heavy oil reservoir production area to be produced, wherein the injection-production well pattern comprises a working well and a production well, and the bottom of the production well is communicated with the bottom of the working well; injecting superheated water and inert gas into an oil reservoir close to the working well through the working well to form a near-critical water environment, wherein the temperature of the superheated water and the inert gas is more than 300 ℃, the temperature of the near-critical water environment is 200-300 ℃, and the pressure of the near-critical water environment is 5-10 MPa; when the injected superheated water submerges the oil reservoir close to the working well, the injection-production well pattern is closed; and maintaining the injection-production well pattern to be closed, so that the oil reservoir of the working well is in the near-critical water environment for 3 to 5 hours, and finally forming crude oil with reduced viscosity in the injection-production well pattern. The viscosity of the thickened oil can be reduced to a greater extent by the thickened oil modifying and viscosity reducing method disclosed by the application.
Application No.: 200820023996.8 relates to a viscosity-reducing oil-extracting heating device for thick oil wellhole in the technical field of crude oil thermal recovery in oil field. The technical scheme is that an annular cavity is formed between the hollow sucker rod and the heat insulation pipe sleeved in the hollow sucker rod, the lower end of the hollow sucker rod is plugged and then communicated with the lower port of the heat insulation pipe, and the heat insulation pipe and the upper port of the annular cavity in the hollow rod are respectively connected with an external circulation pipeline. The hot water circulation of the pipe rod in the heavy oil well replaces the cable heating technology used at present, thus saving energy and equipment investment; the defect that the oil recovery amount cannot be accurately measured due to the fact that hot water is mixed in the thick oil for oil recovery is overcome; avoids the pressure of high cost and environmental pollution of chemical viscosity reduction oil extraction. The technology forms a closed-cycle independent heating system by leaving a proper annular space between the hollow sucker rod and the heat insulation pipe, thereby saving energy, being simple to operate, safe, reliable and long in service life.
The technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The invention aims to provide a pump-crossing closed circulation heating pipe column, which solves the problem of viscosity reduction by heating of a thick oil thermal production well shaft. The softened water is internally circulated in a closed manner, a ground water mixing pipeline is not required to be laid, water resources are saved, an electric heating device is not required, the heavy oil well can be smoothly opened after the operation is finished, and the phenomena of slow descending of a sucker rod, frequent pipeline blockage and the like are avoided in the production process.
In order to achieve the purpose, the invention adopts the following technical scheme that the cross-pump closed circulation heating pipe column comprises an oil pumping pipe column and a hollow rod, wherein the lower end of the hollow rod extends into the oil pumping pipe column, the cross-pump closed circulation heating pipe column further comprises a sealing short joint, a tail pipe, a downhole communicating device and a heating water outlet pipe, the upper end of the tail pipe is in threaded connection with the lower end of the sealing short joint, the upper end of the sealing short joint is in threaded connection with the lower end of the oil pumping pipe column, the lower end of the tail pipe is in threaded connection with an inlet of the downhole communicating device, the lower end of the hollow rod extends downwards, penetrates through the oil pumping pipe column and then enters the tail pipe after passing through a central channel of the sealing short joint, the hollow rod and the central channel of the sealing short joint are in a sliding sealing state, the lower end of the heating water outlet pipe is in threaded connection with an outlet of the downhole communicating device, and the upper end of the heating water outlet pipe extends out of a well head.
The upper end of the heating water outlet pipe extends out of the well mouth to be connected with the water return port of the heating furnace, and the upper end of the hollow rod is connected with the water outlet of the heating furnace.
The underground communicating vessel is integrally cylindrical and is provided with a heating water outlet pipe threaded hole and a tail pipe threaded hole, the heating water outlet pipe threaded hole is an inlet of the underground communicating vessel, the tail pipe threaded hole is an outlet of the underground communicating vessel, and the inside of the underground communicating vessel is provided with a communicating hole which enables the heating water outlet pipe threaded hole and the tail pipe threaded hole to be communicated with each other.
The oil pumping pipe column comprises an oil pipe, an oil well pump and an oil inlet sieve pipe which are sequentially connected from top to bottom, the oil well pump comprises a pump cylinder and a hollow piston inside the pump cylinder, a hollow rod penetrates through a center hole of the hollow piston and is fixedly connected with the hollow piston, a pump fixing valve is installed on the inner wall of the pump cylinder, a center hole for the hollow rod to penetrate through is formed in the center of the pump fixing valve, and the pump fixing valve is located below the hollow piston.
The large four-way upper port of the well head is provided with a large four-way upper flange which is connected with the well head gland through a bolt, the well head gland is provided with a heating water outlet pipe passing through a hole, the large four-way lower port of the well head is provided with a large four-way lower flange, the large four-way lower flange and the sleeve upper port flange of the sleeve upper port are connected through a bolt, the well head gland is provided with an oil pipe passing through the hole, and the oil pipe upper port is connected with the well head three-way.
An upper annular groove is formed in the upper end face of the upper flange of the large four-way joint, a sealing ring is installed, and a lower annular groove is formed in the lower end face of the lower flange of the large four-way joint, and the sealing ring is installed.
And the flange on the large four-way is provided with a heating water outlet pipe suspension hole and an oil pipe suspension hole which are axially communicated.
The flange on the big cross is provided with a radial threaded hole which can be communicated with the heating water outlet pipe suspension hole, and is also provided with a radial threaded hole which can be communicated with the oil pipe suspension hole, and jackscrews are arranged in all the radial threaded holes.
The heating water outlet pipe suspension hole and the oil pipe suspension hole are tapered holes with a large upper part and a small lower part.
Compared with the prior art, the invention has the following beneficial effects:
hot water at the outlet of the heating furnace enters the underground tee joint to the heating water outlet pipe through the hollow rod, the pump cylinder, the pump fixing valve, the sieve pipe and the sealing short joint and circulates to the water return port of the heating furnace, a forced circulation pump is added to the water return port of the heating furnace and circulates repeatedly, and a temperature field is formed in a shaft, so that the purpose of reducing the viscosity of the shaft of the heavy oil well is achieved.
The invention is suitable for viscosity reduction of the mineshafts of all heavy oil wells, the internal closed circulation of softened water is adopted, ground water-doped pipelines are not required to be laid, water resources are saved, an electric heating device is not required, the heavy oil well can be smoothly opened after the completion of operation, the phenomena of slow descending of a sucker rod, frequent pipeline blockage and the like are avoided in the production process, the production period of the oil well is prolonged, the purpose of increasing the yield of crude oil is achieved, and the invention has good economic and social benefits.
Drawings
FIG. 1 is a schematic diagram of a longitudinal section of a pump-crossing closed circulation heating pipe column.
FIG. 2 is a schematic view of the cross-section of the wellhead big cross-section in a front view.
FIG. 3 is a schematic view of a full section of the downhole connector of the present invention.
The labels in the figure are: 0. the device comprises a hollow rod, 1, a wellhead tee joint, 2, a wellhead gland, 3, an oil pipe, 4, a wellhead large cross joint and 4-1, a jackscrew; 5. the device comprises a sleeve, a flange at the upper opening of the sleeve, 6 pump cylinders, 7 hollow pistons, 8 pump fixing valves, 9 oil inlet sieve pipes, 10 sleeves, 11 sealing short joints, 12 underground communicating vessels, 13 tail pipes and 14 heating water outlet pipes; r. heating water outlet pipe hanging hole, r. heating water outlet pipe threaded hole, Y. oil pipe hanging hole, y. tail pipe threaded hole, L. communicating hole, G. steel ring groove and T. through hole.
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.
Referring to fig. 1 to 3, the present invention provides a technical solution:
a cross-pump closed circulation heating pipe column comprises an oil pumping pipe column and a hollow rod 0, wherein the lower end of the hollow rod extends into the oil pumping pipe column, the cross-pump closed circulation heating pipe column further comprises a sealing short joint 11, a tail pipe 13, an underground communicating device 12 and a heating water outlet pipe 14, the upper end of the tail pipe is connected with the lower end of the sealing short joint in a threaded mode, the upper end of the sealing short joint 11 is connected with the lower end of the oil pumping pipe column in a threaded mode, the lower end of the tail pipe 13 is connected with an inlet of the underground communicating device in a threaded mode, the lower end of the hollow rod 0 extends downwards, penetrates out of the oil pumping pipe column and then penetrates through a central channel of the sealing short joint to enter the tail pipe 13, the hollow rod and the central channel of the sealing short joint are in a sliding sealing state, the lower end of the heating water outlet pipe 14 is connected with an outlet of the underground communicating device 12 in a threaded mode, and the upper end of the heating water outlet pipe extends out of a well mouth.
The upper end of the heating water outlet pipe extends out of the well mouth to be connected with a water return port of the heating furnace, and the upper end of the hollow rod is connected with a water outlet of the heating furnace.
The underground communicating vessel 12 is integrally cylindrical, and is provided with a heating water outlet pipe threaded hole r and a tail pipe threaded hole y, wherein the heating water outlet pipe threaded hole is an inlet of the underground communicating vessel, the tail pipe threaded hole is an outlet of the underground communicating vessel, and a communicating hole L which enables the heating water outlet pipe threaded hole and the tail pipe threaded hole to be communicated with each other is formed in the underground communicating vessel.
The oil pumping pipe column comprises an oil pipe 3, an oil well pump and an oil inlet sieve pipe 9 which are sequentially connected from top to bottom, the oil well pump comprises a pump barrel 6 and a hollow piston 7 inside the pump barrel, the upper end of the pump barrel is connected with the oil pipe, the lower end of the pump barrel is connected with the oil inlet sieve pipe, a hollow rod penetrates through a center hole of the hollow piston 7 and is fixedly connected with the hollow piston, a pump fixing valve 8 is installed on the inner wall of the pump barrel, a center hole for the hollow rod to penetrate through is formed in the center of the pump fixing valve, and the pump fixing valve is located below the hollow piston.
The large four-way joint is provided with a flange on the large four-way joint, the flange on the large four-way joint is connected with the gland through a bolt, a through hole T for passing a bolt is formed in the flange on the large four-way joint, the lower flange is provided with a through hole, the well head gland is provided with a heating water outlet pipe passing hole, the lower port of the large four-way joint is provided with a large four-way lower flange, the large four-way lower flange is connected with the upper port flange of the sleeve at the upper port of the sleeve through a bolt, the gland of the well head is provided with an oil pipe passing hole, and the upper port of the oil pipe is connected with the three-way joint 1 of the well head.
The upper end surface of the upper flange of the large four-way joint is provided with an upper annular groove or a steel ring groove G, a sealing ring is installed, and the lower end surface of the lower flange of the large four-way joint is provided with a lower annular groove, and the sealing ring is installed.
And the upper flange of the large four-way is provided with a heating water outlet pipe suspension hole R and an oil pipe suspension hole Y which are axially communicated.
The flange on the big cross is provided with radial threaded holes which can be communicated with the heating water outlet pipe suspension holes and radial threaded holes which can be communicated with the oil pipe suspension holes, and jackscrews 4-1 are arranged in all the radial threaded holes.
The heating water outlet pipe suspension hole and the oil pipe suspension hole are tapered holes with a large upper part and a small lower part.
The outer part of the cross-pump closed circulating heating pipe column is from bottom to top: the underground communicating vessel 12+ the tail pipe 13+ the sealing short joint 11+ the oil inlet sieve tube 9+ the pump cylinder 6+ the oil pipe 3+ the wellhead tee joint 1; a downhole communicator 12+ a heated water outlet pipe 14; a hollow rod 0 inside a cross-pump closed circulation heating pipe column is connected with a hollow piston 7, the hollow piston 7 is connected with a hollow rod 0 with a polished surface in a downward connection mode, the hollow rod 0 and the hollow piston 7 are arranged on the upper portion of a pump fixing valve 8 through an oil pipe 3 and are located in the pump barrel 6, and the hollow rod 0 connected below the hollow piston 7 penetrates through the pump barrel 6 to the lower portion of a sealing short circuit 11. The inner diameter of the heating water outlet pipe 14 is smaller than the inner diameter of the oil pipe 3, and the outer diameter of the heating water outlet pipe 14 is smaller than the outer diameter of the oil pipe 3.
The large four-way joint 4 of the wellhead is in a cross shape, the two ends of the middle of the large four-way joint are provided with clamp heads, large flanges are arranged up and down, a steel ring groove G is arranged on each of the planes of the upper large flange and the lower large flange, the large flange on the upper portion is provided with a conical heating water outlet pipe suspension hole R and a conical oil pipe suspension hole Y, 12 through holes T are vertically arranged on the periphery of the large four-way joint, the large flange on the upper portion is connected with a wellhead gland 2 through bolts, six threaded through holes are radially arranged on the periphery of the large four-way joint, and each of the threaded through holes is internally provided with a jackscrew 4-1.
The underground communicating vessel 12 is a cylinder, a heating water outlet pipe threaded hole r and a tail pipe threaded hole y are arranged on the cylinder, and the middle of the cylinder is communicated through a communicating hole L to form a U-shaped through hole.
The oil pipe 3 is of a single structure, is connected in the middle through threads, is suspended in an oil pipe suspension hole Y in the upper part of a large four-way joint 4 of the wellhead, and is tightly jacked through a jackscrew 4-1.
The oil pipe 3 can also be a coiled oil pipe.
The heating water outlet pipe 14 is of a single structure, is connected with the middle of the heating water outlet pipe through threads, is suspended in a heating water outlet pipe suspension hole R at the upper part of a large four-way 4 flange of a wellhead, and is tightly supported through a jackscrew 4-1.
The heating water outlet pipe 14 can also be a coiled tubing.
The working principle is as follows: hot water at the outlet of the heating furnace enters the underground tee joint to the heating water outlet pipe through the hollow rod, the pump cylinder, the pump fixing valve, the sieve pipe and the sealing short joint and circulates to the water return port of the heating furnace, a forced circulation pump is added to the water return port of the heating furnace and circulates repeatedly, and a temperature field is formed in a shaft, so that the purpose of reducing the viscosity of the shaft of the heavy oil well is achieved.
The invention is suitable for viscosity reduction of shafts of all heavy oil wells, internally and hermetically circulates softened water, does not need to lay ground water-mixed pipelines, saves water resources, does not need an electric heating device, ensures that the heavy oil wells can be smoothly opened after the completion of operation, does not have the phenomena of slow descending of a sucker rod, frequent pipeline blockage and the like in the production process, simultaneously prolongs the production period of the oil wells, achieves the aim of increasing the yield of crude oil, and has good economic and social benefits.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A cross-pump closed circulation heating pipe column comprises an oil pumping pipe column and a hollow rod, wherein the lower end of the hollow rod extends into the oil pumping pipe column, and the cross-pump closed circulation heating pipe column is characterized by further comprising a sealing short joint, a tail pipe, a downhole communicating device and a heating water outlet pipe, wherein the upper end of the tail pipe is in threaded connection with the lower end of the sealing short joint, the upper end of the sealing short joint is in threaded connection with the lower end of the oil pumping pipe column, the lower end of the tail pipe is in threaded connection with an inlet of the downhole communicating device, the lower end of the hollow rod extends downwards, penetrates through the oil pumping pipe column and then passes through a central channel of the sealing short joint to enter the tail pipe, the hollow rod and the central channel of the sealing short joint are in a sliding sealing state, the lower end of the heating water outlet pipe is in threaded connection with an outlet of the downhole communicating device, and the upper end of the heating water outlet pipe extends out of a well head;
the upper end of the heating water outlet pipe extends out of the well mouth and is connected with a water return port of the heating furnace, and the upper end of the hollow rod is connected with a water outlet of the heating furnace; the underground communicating vessel is integrally cylindrical and is provided with a heating water outlet pipe threaded hole and a tail pipe threaded hole, the heating water outlet pipe threaded hole is an inlet of the underground communicating vessel, the tail pipe threaded hole is an outlet of the underground communicating vessel, and the inside of the underground communicating vessel is provided with a communicating hole which can enable the heating water outlet pipe threaded hole and the tail pipe threaded hole to be communicated with each other; the oil pumping pipe column comprises an oil pipe, an oil well pump and an oil inlet sieve pipe which are sequentially connected from top to bottom, the oil well pump comprises a pump barrel and a hollow piston inside the pump barrel, a hollow rod penetrates through a center hole of the hollow piston and is fixedly connected with the hollow piston, a pump fixing valve is installed on the inner wall of the pump barrel, a center hole for the hollow rod to penetrate through is formed in the center of the pump fixing valve, and the pump fixing valve is located below the hollow piston;
the large four-way upper port of the well head is provided with a large four-way upper flange which is connected with the well head gland through a bolt, the well head gland is provided with a heating water outlet pipe passing through a hole, the large four-way lower port of the well head is provided with a large four-way lower flange, the large four-way lower flange and the sleeve upper port flange of the sleeve upper port are connected through a bolt, the well head gland is provided with an oil pipe passing through the hole, and the oil pipe upper port is connected with the well head three-way.
2. The cross-pump closed circulation heating pipe column as claimed in claim 1, wherein the upper end surface of the upper flange of the large four-way is provided with an upper annular groove for mounting the sealing ring, and the lower end surface of the lower flange of the large four-way is provided with a lower annular groove for mounting the sealing ring.
3. The cross-pumping closed circulation heating pipe column as claimed in claim 1, wherein the upper flange of the large four-way joint is provided with a heating water outlet pipe suspension hole and an oil pipe suspension hole which are axially communicated.
4. The cross-pump closed circulation heating pipe column as claimed in claim 2, wherein the large four-way upper flange is provided with radial threaded holes capable of leading to a heating water outlet pipe suspension hole and radial threaded holes capable of leading to an oil pipe suspension hole, and jackscrews are installed in all the radial threaded holes.
5. The cross-pumping closed circulation heating pipe column as claimed in claim 2 or 3, wherein the heating water outlet pipe suspension hole and the oil pipe suspension hole are tapered holes with a large top and a small bottom.
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| CN201910322857.8A CN111827944B (en) | 2019-04-22 | 2019-04-22 | Pump-crossing closed circulating heating pipe column |
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| CN201910322857.8A CN111827944B (en) | 2019-04-22 | 2019-04-22 | Pump-crossing closed circulating heating pipe column |
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| CN111827944B true CN111827944B (en) | 2023-02-17 |
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| CN112727399B (en) * | 2021-03-17 | 2024-05-28 | 克拉玛依胜利高原机械有限公司 | High-pressure pipe column sealing circulation heat tracing wax-preventing device and implementation process |
| CN114837616B (en) * | 2022-06-10 | 2023-11-03 | 西南石油大学 | Heating device for prevent oil pipe wax deposition of oil production well |
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