CN112228024B - Thickened oil recovery method and pipe column - Google Patents
Thickened oil recovery method and pipe column Download PDFInfo
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- CN112228024B CN112228024B CN201910633311.4A CN201910633311A CN112228024B CN 112228024 B CN112228024 B CN 112228024B CN 201910633311 A CN201910633311 A CN 201910633311A CN 112228024 B CN112228024 B CN 112228024B
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- rod pump
- heating cable
- pump
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000013589 supplement Substances 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 60
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 239000000295 fuel oil Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 208000010727 head pressing Diseases 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
-
- 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
- E21B36/006—Combined heating and pumping means
-
- 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
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention provides a thick oil exploitation method and a pipe column, the thick oil exploitation method comprises the steps of arranging a heating cable in an inner cavity of a lower oil pipe below a rod pump to electrically heat liquid in the pipe column, arranging a single-core cable which can be connected with the heating cable at the outer side of an upper oil pipe above the rod pump to supplement and heat the liquid in the upper oil pipe, and the thick oil exploitation method adopts an electric heating mode to heat liquid before the pump of the rod pump so as to ensure the temperature of the liquid before the pump and reduce the viscosity of thick oil, thereby improving the pump hanging height of the rod pump, reducing the lifting power of the pump, reducing the overhaul times of the rod pump, prolonging the service life of the rod pump, and simultaneously, supplementing and heating the liquid after the pump of the rod pump through the single-core cable so as to ensure the liquid outlet temperature of a wellhead, thereby being beneficial to reducing back pressure and conveying the oil through a gathering pipeline.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a thickened oil exploitation method and a tubular column.
Background
Petroleum plays a significant role in the operation of a country as a strategic resource for the operation of a country. The manufacturing industry in China is developed, and the operation of industrial and military equipment all needs a large amount of petroleum resources as a basis. The thick oil reserves of ultra-deep wells in China are rich, but the exploitation difficulty is high.
At present, a plurality of oil extraction processes, such as steam injection exploitation processes, thin oil-doped viscosity reduction processes, high-efficiency water-soluble viscosity reducer-doped emulsification viscosity reduction processes and the like, are developed at home and abroad. But the processes used in different oilfield blocks are different due to regional differences. The yield of deep thickened oil in China accounts for about 57% of the total yield, and the viscosity reduction process of blending the thinner oil is mainly adopted at present, but the development of the viscosity reduction process of blending the thinner oil is limited along with the reduction of thinner oil resources.
Therefore, the invention discloses a high-efficiency and economic thickened oil recovery method and a tubular column, which are technical problems to be solved urgently.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides a thickened oil recovery method and a tubular column. The thickened oil exploitation method adopts an electric heating mode to heat pump front liquid of the rod pump so as to ensure the temperature of the pump front liquid and reduce the viscosity of thickened oil, thereby improving the pump hanging height of the rod pump, reducing the lifting power of the pump, reducing the overhaul times of the rod pump and prolonging the service life of the rod pump. Meanwhile, the liquid after the pump is supplied and heated for the rod pump through the single-core cable, so that the liquid outlet temperature of the wellhead is ensured, and the return pressure and the oil liquid delivery of the gathering pipeline are reduced.
According to a first aspect of the present invention, there is provided a thickened oil recovery method comprising laying a heating cable in an inner cavity of a lower oil pipe below a sucker rod pump to electrically heat liquid therein, and arranging a single-core cable connectable to the heating cable outside an upper oil pipe above the sucker rod pump to supplement heating of liquid in the upper oil pipe.
In one embodiment, the liquid in the lower tubing is heated to 90-120 degrees celsius by a heating cable and the liquid in the upper tubing is heated to 70-90 degrees celsius by a single core cable.
According to a second aspect of the present invention there is provided a tubular string comprising:
An oil pipe at the upper part of the oil pipe,
A rod pump arranged at the lower end of the upper oil pipe,
A lower oil pipe arranged at the lower end of the rod pump,
An engagement means provided between the sucker-rod pump and the lower tubing,
A plurality of single-core cables which can be connected with a ground power supply are arranged in an extending way in the annular space between the upper oil pipe and the sucker rod pump and the shaft,
An integrated heating cable set extending in the inner cavity of the lower oil pipe,
The single-core cable radially penetrates through the connecting device and is correspondingly connected with the heating cable of the integrated heating cable group in the inner cavity of the connecting device.
In one embodiment, a centralizer is provided at the collar of the upper tubing, an opening is provided in the centralizer that extends axially therethrough, a retaining member is provided at the opening, and a circumferentially extending first groove is provided on the inner wall of the centralizer for engagement at the collar of the upper tubing.
In one embodiment, a second groove is provided in the inner wall of the centralizer that extends axially therethrough.
In one embodiment, the second grooves are spaced apart to form thrust posts between adjacent second grooves.
In one embodiment, the engagement means comprises:
A cylindrical upper joint, a cylindrical upper joint and a cylindrical lower joint,
A sleeve arranged at the lower end of the upper joint,
The upper end of the cylindrical rotary joint is arranged in the inner cavity of the upper joint and is clamped by the step surface, the lower end of the cylindrical rotary joint can be fixedly connected with the sleeve,
Wherein the single core cable can extend through the wall of the upper connector to the interior cavity of the sleeve and the integrated heating cable set can extend into the interior cavity of the sleeve.
In one embodiment, a hoop is arranged on the outer side of the rotary joint, the hoop can be respectively abutted with the upper joint and the sleeve in the axial direction, and the hoop can be respectively clamped with the upper joint and the sleeve in the circumferential direction.
In one embodiment, a lower joint is arranged at the lower end of the sleeve, a third step surface is arranged on the inner wall of the lower joint, a bearing seat capable of being seated on the third step surface is sleeved on the integrated heating cable group, and an axially extending communication hole is arranged on the outer wall of the bearing seat.
In one embodiment, a container is disposed within the lumen of the cannula, the container having:
A main body in the shape of a cylinder,
An upper end cover arranged at the opening of the upper end of the main body in a sealing way, a single-core cable extends downwards through the upper end cover,
The lower end cover is arranged at the opening of the lower end of the main body in a sealing way, the integrated heating cable group extends upwards through the lower end cover, the heating cable is correspondingly and matingly connected with the single-core cable in the inner cavity of the main body,
The inner cavity of the container is filled with inorganic mineral insulation.
Compared with the prior art, the method has the advantages that the thickened oil exploitation method adopts an electric heating mode to heat the pump front liquid of the rod pump so as to ensure the temperature of the pump front liquid and reduce the viscosity of thickened oil, thereby improving the pump hanging height of the rod pump, reducing the lifting power of the pump, reducing the overhaul times of the rod pump and prolonging the service life of the rod pump. Meanwhile, the liquid after the pump is supplied and heated for the rod pump through the single-core cable, so that the liquid outlet temperature of the wellhead is ensured, and the return pressure and the oil liquid delivery of the gathering pipeline are reduced.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 shows a schematic diagram of a heavy oil production string according to one embodiment of the invention;
FIG. 2 shows a schematic view of an engagement device according to one embodiment of the invention;
FIG. 3 shows a conversion device according to one embodiment of the invention;
FIG. 4 shows a cross-sectional view of a single core cable and heating cable junction according to one embodiment of the invention;
FIG. 5 shows a centralizer according to an embodiment of the invention;
in the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Fig. 1 shows a heavy oil production string 200 according to the present invention. As shown in fig. 1, the heavy oil production string 200 includes an upper tubing 201, a sucker rod pump 202, a lower tubing 203, a junction device 100, a single conductor cable 2, and an integrated heater cable assembly 3. Wherein the upper tubing 201 is used to transport oil and gas to the surface. A sucker-rod pump 202 is provided at the lower end of the upper tubing 201 for lifting the hydrocarbon. A lower tubing 203 is provided at the lower end of the sucker rod pump 202 in communication with the reservoir for transporting the hydrocarbon. The adapter 100 is disposed between the sucker rod pump 202 and the lower tubing 203. The single-core cable 2 is arranged in an annulus between the rod pump 202 and the upper oil pipe 201 from top to bottom in an extending manner, one end of the single-core cable is connected with a ground power supply, and the other end of the single-core cable radially penetrates through the connecting device 100 to be connected with the integrated heating cable set 3 for supplying power to the integrated heating cable set 3, and meanwhile, the single-core cable supplements heat to heat the upper oil pipe 201 so as to heat liquid in the upper oil pipe 201, so that back pressure is reduced, and oil is conveyed by a gathering pipeline. And the integrated heating cable set 3 is arranged in the inner cavity of the lower oil pipe 203 and is used for heating liquid in the lower oil pipe to reduce the viscosity of thick oil, further improve the pump hanging height of the rod pump 202, reduce the lifting power of the rod pump 202, reduce the maintenance times of the rod pump 202 and prolong the service life of the rod pump 202.
As shown in fig. 2, the engagement device 100 includes an upper connector 90, a sleeve 91. Wherein the upper joint 90 is cylindrical. And a sleeve 91 is provided at the lower end of the upper joint 90. The single-core cable 2 extends through the wall of the upper connector 90 to the inner cavity of the sleeve 91. While the integrated heating cable set 3 includes a plurality of integrated heating cables 31, each heating cable 31 is divided at the upper end and is connected to the single-core cable 2 in a one-to-one matching manner, respectively, so as to receive the electric power of the single-core cable 2 and generate heat to heat the pre-pump liquid. In use, the single-core cable 2 itself has a small diameter and is easily distributed outside the sucker-rod pump 202 and the upper rear oil pipe 201 of the sucker-rod pump 202. After passing through the rod pump 202, the single-core cable 2 is inserted into the inner cavity of the upper connector 90, and then connected with the integrated heating cable set 3 in the sleeve 91, and the integrated heating cable set 3 may extend downward into the lower oil pipe 203.
In one embodiment, the engagement device 100 further includes a cylindrical swivel 92. The upper end of the swivel joint 92 is disposed in the interior cavity of the upper joint 90, while the lower end is threadably connected to the sleeve 91. Wherein, the outer wall of the rotary joint 92 is provided with a first step surface 93 facing downwards, and the inner wall of the upper joint 90 is provided with a second step surface 94 which faces upwards for clamping. Preferably, the first step surface 93 is configured as a slope inclined downward in the outer to inner direction, and the second step surface 94 is matingly engaged with the first step surface 93. By providing the upper sub 90 as described above, the axially downward position of the swivel 92 can be defined, and the upper sub 90 can also be rotated axially relative to the swivel 92 to facilitate installation of the adapter into a well.
In one embodiment, a collar 95 is provided on the outside of the swivel 92. The upper and lower ends of the anchor ear 95 can be respectively abutted with the upper joint 90 and the sleeve 91 in the axial direction, for example, by means of stepped surfaces, so as to define the axial relative positions of the upper joint 90 and the sleeve 91. The inner wall of the anchor ear 95, which is sleeved with the upper joint 90 and the sleeve 91 at the downward both ends, is configured to have a variable-type cross section, such as a hexagon, for being respectively engaged with the upper joint 90 and the sleeve 91, thereby defining circumferential positions of the anchor ear 95 and the upper joint 90 and the sleeve 91, and preventing relative rotation. And the anchor ear 95 can be conveniently disassembled and assembled to ensure that the connecting device can be smoothly put into the well, and the specific process is described in detail later.
In one embodiment, the upper sub 90 is provided with a shoulder 96 that increases the outer diameter of the lower end of the upper sub relative to the outer diameter of the upper end. The shoulder 96 is used for the passage of the single-core cable 2. This arrangement facilitates operations such as machining and installation.
In one embodiment, a lower connector 97 is provided at the lower end of the sleeve 91. And a third step surface 98 is provided in the inner cavity of the lower joint 97. Correspondingly, the integrated heating cable set 3 is fixedly sleeved with the bearing seat 7. In use, the socket 7 will sit on the stepped surface of the tubing for hanging the integrated heater cable assembly 3 extending downwardly within the tubing. Structurally, as shown in fig. 3, the upper end of the bearing seat 7 is a cylindrical body, and the lower end is a cylindrical body with an increased diameter. A communication groove 72 is provided in the lower end face of the cylindrical column having a large diameter. Meanwhile, a communication hole 71 penetrating in the axial direction is provided on the outer wall surface of the cylindrical body having a large diameter. For example, a plurality of communication holes 71 may be provided at intervals in the circumferential direction. The communication hole 71 communicates with the communication groove 72. In use, the lower end face of the large diameter cylindrical body is engaged with the third stepped surface 98 to suspend the integrated heating cable set 3 extending downward in the oil pipe, and the communication groove 72 and the communication hole 71 communicating with each other are used for liquid communication in the oil pipe. The upper end of the bearing seat 7 is welded with the integrated heating cable set 3 to realize fixation. It should be noted that, the welded portions of the joining device 100 are all subjected to flaw detection and annealed after the whole welding is completed to eliminate the welding stress, thereby ensuring the mechanical strength and high pressure-bearing sealing capability of the joining device.
In one embodiment, the container 1 is disposed in the inner cavity of the sleeve 91, and the inner cavity of the container 1 is filled with inorganic mineral insulation to achieve insulation and heat dissipation. Structurally, the container 1 has a cylindrical main body 11, a 1212 sealingly provided at an upper end opening of the main body 11, and a lower end cap 13 sealingly provided at a lower end opening of the main body 11. Wherein the single core cable 2 extends downward through the upper end cap, and the integrated heating cable set 3 extends upward through the lower end cap 13. The container 1 of this arrangement is simple in construction and facilitates the operation of connecting the heating cable 3 and the single-core cable 2.
Preferably, the lower end cap 13 is configured to have a cylindrical shape at an upper end and to be at least partially inserted into the inner cavity of the body 11, and is configured to have a tapered shape in which a sectional area is gradually reduced from top to bottom. The main body 11 and the lower end cap 13 are fixedly connected by welding, for example, welding spots are concentrated at the intersections of the main body 11 and the lower end cap 13 and are fully welded. At the same time, the lower end of the lower end cap 13 is welded to the integrated heating cable set 3. In addition, the upper end cap 12 is configured in a column shape and is partially inserted into the inner cavity of the body 11. A bent triangular pyramid 14 for the single-core cable 2 to pass through is provided on the upper end surface of the upper end cap 12. The triangular pyramid 14 has an outside diameter that increases stepwise in the top-to-bottom direction. The main body 11 and the upper end cap 12 are fixedly connected by welding, for example, welding spots are concentrated at the intersections of the main body 11 and the upper end cap 12 and are fully welded. The number of triangular cones 14 matches the number of single-core cables 2, and the positions are set at intervals on the upper end cover 12 to define the corresponding single-core cables 2. The upper and lower ends of the triangular cone 14 are welded to the single-core cable 2 and the upper end cap 12, respectively. The conical lower end cover 13 and the bent triangular cone 14 can well protect the corresponding integrated heating cable group 3 and the single-core cable 2.
In one embodiment, a disc-shaped ceramic plate 6 is disposed in the interior cavity of the container 1. At the same time, axial through holes 61 are provided at intervals in the ceramic sheet 6. Preferably, the number of through holes 61 matches that of the single-core cable 2, and the plurality of through holes 61 are uniformly distributed. The connection section of the heating cable 3 and the single core cable 2 passes through the through hole 61. The ceramic sheet 6 not only plays a role in insulating the cables (the heating cable 3 and the single-core cable 2) from the outside, but also positions the respective cables and plays a role in insulating each other between the respective cables.
In addition, the main body 11, the lower end cap 13 and the upper end cap 12 are all made of stainless steel or 35CrMoA alloy. The container 1 has a pressure-bearing sealing capacity of up to 35MPa and can operate at high temperatures, for example 250 °, while also ensuring high electrothermal conversion properties.
In one embodiment, as shown in fig. 4, an axially extending blind connection hole 21 is provided in the connection section of the single-core cable 2. The connecting section of the corresponding heating cable 31 is inserted into the blind hole 21. A fixing sleeve 4 is sleeved on the outer wall of the single-core cable 2. The fixing member 5 radially passes through the single-core cable 2, the heating cable 31, and the fixing sleeve 4 to connect the single-core cable 2 and the heating cable 31 together. The connecting method realizes the locking connection of the single-core cable 2 and the heating cable 31 in the axial direction and the radial direction, effectively avoids the separation of conductors of different materials of the single-core cable 2 and the heating cable 31 due to different expansion coefficients at a high temperature state, and ensures the firmness of connection.
Preferably, a plurality of grooves 32 are engraved on the outer wall of the connection section of the heating cable 31. For example, the grooves 32 may be triangular in cross-section and the grooves 32 may be 0.5-1 mm deep. By providing the grooves 32, the conductivity between the single-core cable 2 and the heating cable 31 can be improved, thereby ensuring the heating efficiency.
The foregoing description has been made taking, as an example, a blind hole 21 provided in the single-core cable 2 and the heating cable 3 inserted into the blind hole 21. The blind holes of the present application may be provided in the heating cable 3, and the connection is similar to the above, and will not be described again. In addition, the blind holes can be arranged in consideration of the outer diameters of the two connecting pieces, and the blind holes are arranged on the pieces with large outer diameter sizes.
For example, the single-core cable 2 may be a copper wire, and the heating cable 3 may be a nickel-chromium electric heating wire. Of course, the application is not limited to the above-described limitations, and the heating cable 3 may also be constructed of copper alloy or other electric heating wires, for example.
In one embodiment, the inorganic mineral insulator is magnesium oxide powder. Through the arrangement, the insulation between the junction of the heating cable 3 and the single-core cable 2 and the outside is realized, the heat conduction performance of the inorganic mineral insulator can be improved, the temperature of the junction is effectively emitted, and the high electrothermal conversion performance is realized.
The engagement means further comprises a first connector 99 arranged at the upper end of the upper connector 90 for connection therewith. The first connector 99 is configured at one end as a male connector for connecting the upper connector 90. A second joint 89 is provided at the lower end of the lower joint 97 for connection. Both ends of the second connector 89 are configured in the form of male threads. The above arrangement enables the connection of the engagement means to other pipe elements, such as tubing.
The upper joint 90 may be of a split structure for convenience of manufacture, for example, including a threaded upper joint body 88 and a transition sleeve 87 provided at a lower end of the upper joint body 88. Wherein a shoulder 96 is provided on the upper joint body 88 and a second step surface 94 is provided on the inner wall of the transition sleeve 87.
Preferably, the upper joint, the sleeve 91, the lower joint 97, the first joint 99, the second joint 89, the rotary joint 92, and other parts of the engagement device are all made of 35CrMoA alloy materials. While plating nickel and phosphorus on the outer surface of the above-mentioned component. Through the arrangement, the connecting device is more suitable for working conditions of high temperature, high pressure, water and corrosion positions at the bottom of a well.
In one embodiment, centralizers 205 are provided at the collars of the upper tubing 201 for protecting the single-conductor cable 2 provided to the outer wall of the upper tubing 201. As shown in fig. 5, the centralizer 205 is provided with an opening 206 extending axially therethrough. A lock 207 is provided at the opening 91. And a circumferentially extending first groove (not shown) is provided on the inner wall of centralizer 205 for snap-fit engagement with the collar of upper tubing 201. In use, opening 206 is opened to sleeve centralizer 9 over the outer wall of upper tubing 201, and locking member 92 is used to lock opening 206. At this point, the single conductor cable 2 is positioned between the upper tubing 201 and the centralizer 205, and the first groove is trapped at the collar of the upper tubing 201 to define that the centralizer 205 cannot move axially and thus not displace during the running or running of the tubing string 200. In addition, a second groove 208 for the single-core cable to pass through is provided on the inner wall of the centralizer 9 so as to pass through in the axial direction. And, a plurality of spaced second grooves 208 are provided on the inner wall to form thrust posts 209 therebetween. During use, for example, the single-core cable 2 may be placed into the second groove 208, with the thrust stud 209 abutting the outer surface of the upper oil pipe 201 for defining the position of the single-core cable 2 or the like.
The method of running the engagement device 100 of the heavy oil production string 200 is described in detail below with respect to fig. 1-5.
First, the second sub 89 is threadedly connected to the lower tubing 203 that has been run downhole.
Second, the lower joint 97 is tightened with the second joint 89 to meet the torque demand.
Third, the lower sub 97 is snapped into place at the wellhead.
Fourth, the prefabricated, electrically connected, integrated heating cable set 3 is run down the well, stopping when about 75-85m remains, to maintain the safe distance of the fire at the well site.
Fifth, the rotary joint 92 is fitted with an O-ring and then pushed into the interior cavity of the transition sleeve 87. Next, the single-core cable 2 is sequentially passed through the sleeve 91, the rotary joint 92, and the transition sleeve 87 from below to above, and then is passed out of the shoulder 96 of the upper joint body 88. Outside the shoulder 96, the single-core cable 2 extends out of the head end and is sleeved with a sealing piece and a square head pressing cap in sequence.
Sixth, the electrical connection (firing operation) of the single-core cable 2 and the heating 31 is performed in the field at a safe distance from the wellhead wellsite firing, and the qualification test of the electrical performance is performed.
Seventh, the first joint 99, the upper joint main body 88, the transition sleeve 87, the rotary joint 92, and the sleeve 91 are manually screwed, and the anchor ear 95 is temporarily attached. The combination is translated towards the wellhead direction and the integrated heating cable set 3 is continued to be lowered to the limit.
Eighth, the seventh combination is hoisted and made vertical, and the integrated heating cable set 3 is continuously lowered until the bearing seat 7 is stably seated on the third step surface 98. The temporarily installed anchor 95 is then removed.
Ninth, the lower joint 97 is first tightened with the sleeve 91 to achieve the torque requirement. The swivel 92 is then screwed with the sleeve 91. At this time, since the anchor ear 95 is removed and the rotary joint 92 can be rotated with respect to the transition sleeve 87, the single-core cable 2 and the integrated heating cable group 3 located in the inner cavity of the splicing device are not affected. The locking sleeve 91 releases the locking of the lower joint 97 and lowers the operational installation height into the well. The upper connector body 88 is locked to secure the position of the single-core cable 2, and the transition sleeve 87 is screwed with the upper connector body 88. During this process, the position of the single-core cable 2 can be adjusted, for example, the single-core cable 2 is drawn out. And the anchor ear 95 is installed to prevent the upper joint 90 from moving upwards and rotating.
Tenth, the square-head press cap of the single-core cable 2 at the shoulder 96 is locked. The first adapter 99 and the upper adapter body 88 are then tightened.
Eleventh, the first connector 99 is snapped off, the sleeve 91 is released, and the adapter 100 is driven into the well. To this end, the engagement device 100 is well-entered smoothly.
The application also relates to a method for producing thick oil by using the tubular column 100. After the pipe string 100 is lowered into the wellbore, the integrated heating cable set 3 electrically heats the liquid in the inner cavity of the lower tubing 203 below the sucker rod pump 202 for improving the pumping condition of the liquid after the single-core cable 2 is connected to the surface power supply for power transmission. For example, the liquid in the lower oil pipe 203 is heated to 90-120 degrees celsius by its own parameters set in the integrated heating cable set 3. The single-core cable 2 is used as a power supply for conveying and has weak power heating at the same time so as to supplement heat loss of a shaft, for example, liquid in the upper oil pipe 201 is at 70-90 ℃, so that back pressure is reduced, and conveying of a gathering and conveying pipe is ensured.
In the present application, the terms "upper" and "lower" are used with reference to the actual operating orientation of the heavy oil production string 100.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make modifications or variations within the technical scope of the present invention disclosed herein, and such modifications or variations are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (8)
1. A heavy oil recovery string, comprising:
An oil pipe at the upper part of the oil pipe,
A rod pump arranged at the lower end of the upper oil pipe,
A lower oil pipe arranged at the lower end of the rod pump,
A connecting device arranged between the all-rod pump and the lower oil pipe,
A plurality of single-core cables which can be connected with a ground power supply are arranged in an extending mode in an annular space between the upper oil pipe and the sucker rod pump and the shaft,
An integrated heating cable set extending in the inner cavity of the lower oil pipe,
The single-core cable radially passes through the connecting device and is correspondingly connected with the heating cable of the integrated heating cable group in the inner cavity of the connecting device;
The engagement device includes:
A cylindrical upper joint, a cylindrical upper joint and a cylindrical lower joint,
A sleeve arranged at the lower end of the upper joint,
The upper end of the cylindrical rotary joint is arranged in the inner cavity of the upper joint and is clamped by the step surface, the lower end of the cylindrical rotary joint can be fixedly connected with the sleeve,
Wherein the single core cable is extendable through the wall of the upper connector to the lumen of the sleeve, and the integrated heating cable set is extendable into the lumen of the sleeve;
The outside of rotary joint is provided with the staple bolt, in axial, the inner wall structure that upper and lower both ends and upper joint and sleeve pipe cup joint mutually is for having the polytropic cross-section to be used for respectively with upper joint and the detachable joint of sleeve pipe, thereby inject the circumferential position of staple bolt and upper joint and sleeve pipe, prevent relative rotation.
2. A thick oil production string as claimed in claim 1 wherein a centralizer is provided at the collar of the upper tubing, an axially extending opening is provided in the centralizer, a retaining member is provided at the opening, and a circumferentially extending first groove is provided in the inner wall of the centralizer for engagement at the collar of the upper tubing.
3. A thick oil production string as claimed in claim 2 wherein a second recess is provided in the inner wall of the centralizer which extends axially therethrough.
4. A thick oil production string as claimed in claim 3 wherein the second grooves are spaced apart to form thrust action columns between adjacent ones of the second grooves.
5. A thick oil production string as claimed in claim 4 wherein a lower joint is provided at the lower end of the casing, a third step surface is provided on the inner wall of the lower joint, a bearing seat capable of sitting on the third step surface is sleeved on the integrated heating cable set, and an axially extending communication hole is provided on the outer wall of the bearing seat.
6. A thick oil production string as claimed in claim 5 wherein a vessel is provided in the interior cavity of the casing, the vessel having:
A main body in the shape of a cylinder,
An upper end cover arranged at the opening of the upper end of the main body in a sealing way, the single-core cable extends downwards through the upper end cover,
The lower end cover is arranged at the opening of the lower end of the main body in a sealing way, the integrated heating cable group extends upwards through the lower end cover and is correspondingly and matingly connected with the single-core cable in the inner cavity of the main body,
An inorganic mineral insulator is filled in the inner cavity of the container.
7. A method of heavy oil recovery, characterized in that it is carried out with a heavy oil recovery string according to any one of claims 1 to 6, comprising:
A heating cable is arranged in the inner cavity of the lower oil pipe below the rod pump to electrically heat the liquid in the lower oil pipe, and a single-core cable capable of being connected with the heating cable is arranged on the outer side of the upper oil pipe above the rod pump to supplement and heat the liquid in the upper oil pipe.
8. The thickened oil recovery method of claim 7 wherein the liquid in the lower tubing is heated to 90-120 degrees celsius by the heating cable and the liquid in the upper tubing is heated to 70-90 degrees celsius by the single core cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910633311.4A CN112228024B (en) | 2019-07-15 | 2019-07-15 | Thickened oil recovery method and pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910633311.4A CN112228024B (en) | 2019-07-15 | 2019-07-15 | Thickened oil recovery method and pipe column |
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| CN112228024A CN112228024A (en) | 2021-01-15 |
| CN112228024B true CN112228024B (en) | 2024-04-19 |
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| CN201910633311.4A Active CN112228024B (en) | 2019-07-15 | 2019-07-15 | Thickened oil recovery method and pipe column |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112228025B (en) * | 2019-07-15 | 2024-06-25 | 久盛电气股份有限公司 | Oil well pump-passing electric heating protection tubular column |
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| WO2001053653A1 (en) * | 2000-01-19 | 2001-07-26 | Cannon James H | A polymeric centralizer |
| CN2556356Y (en) * | 2002-05-20 | 2003-06-18 | 茂名市同人实业有限公司 | Valve-type centralizer for fixing collar joint |
| RU2280153C1 (en) * | 2005-02-11 | 2006-07-20 | Юрий Сергеевич Самгин | Heating method and device for oil production well provided with sucker-rod borehole pump |
| CN206174885U (en) * | 2016-11-14 | 2017-05-17 | 沈阳华威石油机械制造有限公司 | Spiral shell is centralizer for sucker -rod pumping |
| CN208330322U (en) * | 2018-05-10 | 2019-01-04 | 中国石油天然气股份有限公司 | Thick oil thermal recovery tubular column |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109703A (en) * | 1985-12-09 | 1987-06-24 | 国际壳牌研究有限公司 | Long underground interval heating means of distance of high temperature and device |
| WO2001053653A1 (en) * | 2000-01-19 | 2001-07-26 | Cannon James H | A polymeric centralizer |
| CN2556356Y (en) * | 2002-05-20 | 2003-06-18 | 茂名市同人实业有限公司 | Valve-type centralizer for fixing collar joint |
| RU2280153C1 (en) * | 2005-02-11 | 2006-07-20 | Юрий Сергеевич Самгин | Heating method and device for oil production well provided with sucker-rod borehole pump |
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| CN208330322U (en) * | 2018-05-10 | 2019-01-04 | 中国石油天然气股份有限公司 | Thick oil thermal recovery tubular column |
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| CN112228024A (en) | 2021-01-15 |
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