CN211851685U - Layered oil production pipe column - Google Patents
Layered oil production pipe column Download PDFInfo
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- CN211851685U CN211851685U CN202020032072.5U CN202020032072U CN211851685U CN 211851685 U CN211851685 U CN 211851685U CN 202020032072 U CN202020032072 U CN 202020032072U CN 211851685 U CN211851685 U CN 211851685U
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Abstract
The utility model relates to a layering oil production pipe column, including the butt joint tubular column and the layering distribution tubular column of vertical setting and butt joint from top to bottom, the butt joint tubular column includes from last to the electric submersible pump unit that connects gradually, can detect the sensor and the secondary butt joint ware of the temperature and the pressure of electric submersible pump unit department, and the layering distribution tubular column includes from last to the connector of giving up and a plurality of distribution subassembly that connect gradually down, and the secondary butt joint ware can dock with the connector of giving up. The layered oil production pipe column in the utility model can detect the production data such as temperature, pressure and the like at the electric submersible pump unit in real time, and ensure the normal work of the electric submersible pump unit; meanwhile, the outer diameter of the whole pipe column is small, the offshore oil well production device can be suitable for offshore oil well production with a small well head, and the structure is simple.
Description
Technical Field
The utility model relates to an oil field oil recovery engineering field especially relates to a layering oil production pipe, the oil recovery of specially adapted offshore oil field.
Background
In Liaohe oil field, the offshore oil field enters the middle and later development stages, the water content of the oil well is gradually increased due to the adoption of the multi-layer combined production general tubular column, a main oil layer cannot be vigorously exploited, and the oil extraction speed and the development effect of the oil well are seriously influenced. Therefore, the oil field is developed reasonably by adopting stratified mining at present so as to improve the oil extraction speed and ensure that the oil field has higher ultimate recovery ratio. However, there are a number of problems with current stratified production strings, such as:
the electric pump well layered oil production pipe column disclosed in patent CN2837506Y has the following problems: 1. the data such as temperature, pressure and the like at the electric submersible pump cannot be monitored in real time; however, the electric submersible pump is expensive, and if the production data such as temperature, pressure and the like at the electric submersible pump are not in the normal range, the electric submersible pump is easy to damage, and large economic loss is caused; 2. the separate production device is controlled by a hydraulic control pipeline, a hydraulic control cabinet is required to be arranged at a wellhead, the pressure of the hydraulic control pipeline is ensured to be kept within a required range, the production cost is increased, and the work load of well patrol is increased; and the two-way hydraulic control switch is adopted to realize layer changing, and pressing operation is needed during layer changing, so that the method is complex.
The integrated pipe column for the offshore separate-layer sand control separate-layer oil production separate-layer test disclosed in the patent CN203685147U has the following problems: 1. although the production and test integration can be realized by adopting the Y-shaped joint production pipe column, the pipe column has larger outer diameter, can only be suitable for oil wells with the casing inner diameter of more than nine inches, and is not suitable for casing oil wells with the casing inner diameter of 7 inches or less; for the offshore platform of the Liaohe, the space of the wellhead platform is too small, the wellhead is small, and the inner diameter of the casing pipe is seven inches at most, so that the offshore platform of the Liaohe cannot be applied; 2. the separate production device is controlled by a hydraulic control pipeline, a hydraulic control cabinet is required to be arranged at a wellhead, the pressure of the hydraulic control pipeline is guaranteed to be kept within a required range, the production cost is increased, and the work load of the well patrol is increased.
The layered production allocation method of the layered production allocation string tool of the submersible electric pump well disclosed in the patent CN101319605B has the following problems: 1. the tubular column is not provided with a cable packer, so that the annular space of the oil sleeve cannot be sealed in an emergency, the production safety of the oil well is ensured, and the safety and environmental protection requirements of the production of the offshore oil well are not met; 2. the tubular column is not provided with an underground safety valve, so that the oil pipe cannot be sealed in emergency, the production safety of an oil well is ensured, and the tubular column is not suitable for offshore oil well production.
In addition, a sliding sleeve is also generally arranged in the whole layered pipe column, and the sliding sleeve is closed during oil extraction, so that a communication channel between the oil pipe and the casing pipe is closed; open the sliding sleeve when the well is washed in the circulation, make oil pipe and sleeve pipe be linked together, the opening of whole sliding sleeve with close all need utilize the steel wire operation device to throw on the well head platform and drag for the appurtenance who is used for realizing the sliding sleeve switching. However, the steel wire operating device for the throwing and fishing auxiliary tool has larger volume and larger occupied space, and the space of a wellhead platform is too small for a Liaohe offshore platform, and is generally only 25m2Therefore, the above offshore platform cannot open and close the sliding sleeve by using the wire working device, and is inconvenient for performing the circulating well-flushing operation.
Therefore, the inventor provides a layered oil production pipe column by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a layering oil production pipe column, which can detect the production data such as temperature, pressure and the like at the electric submersible pump unit in real time and ensure the normal work of the electric submersible pump unit; meanwhile, the outer diameter of the whole pipe column is small, the offshore oil well production device can be suitable for offshore oil well production with a small well head, and the structure is simple.
The utility model aims at realizing the layered oil production pipe column, which comprises a butt joint pipe column and a layered production allocation pipe column which are vertically arranged and are butted up and down; the butt joint tubular column includes from last to the electric submersible pump unit that connects gradually down, can detect sensor and the secondary butt joint ware of the temperature and the pressure of electric submersible pump unit department, and the layering is joined in marriage the production tubular column and is included from last to the connector of giving up and a plurality of components of joining in marriage that connect gradually down, and the secondary butt joint ware can dock with the connector of giving up.
In a preferred embodiment of the utility model, each production allocation component comprises a production allocation device and a production allocation packer arranged above the production allocation device, the releasing connector is electrically connected with the plurality of production allocation devices through production allocation cables, and the bottom end of the layered production allocation tubular column is also connected with a plug; and a butt joint cable is arranged on the outer wall of the butt joint pipe column, and the lower end of the butt joint cable is electrically connected with the secondary butt joint device.
The utility model discloses an among the preferred embodiment, the butt joint tubular column is still including establishing the bleeder in electric submersible pump unit top.
In a preferred embodiment of the present invention, the docking pipe further comprises an anti-dropping device disposed above the oil drain device.
The utility model discloses an in the preferred embodiment, the anti-drop ware includes the outer tube of vertical setting, is fixed with the dabber in the outer tube, sets up the central axial through-hole that can supply the lance of bleeder to pass and restrict to scrape the wax ware and pass at the spindle, and the water conservancy diversion axial through-hole that a plurality of can restrict to scrape the wax ware and pass is still seted up in spindle and lie in central axial through-hole periphery.
In a preferred embodiment of the present invention, the utility model further comprises a wax scraper; the diameter of the central axial through hole is larger than the diameter of a collision rod of the oil drain device and smaller than the diameter of a plumb bob of the wax scraper, and the diameter of the flow guide axial through hole is smaller than the diameter of the plumb bob of the wax scraper.
In a preferred embodiment of the present invention, the distance between the drop preventer and the oil drain is greater than or equal to 300 m.
In a preferred embodiment of the present invention, the core shaft is made of alloy material, and the inner wall of the outer tube is provided with a nano-sized ferromagnetic powder layer.
In a preferred embodiment of the present invention, the docking string further comprises a cable packer disposed above the drop preventer.
In a preferred embodiment of the present invention, the docking string further comprises an underground safety valve disposed above the cable packer.
In a preferred embodiment of the present invention, a check valve is provided between the oil drain and the submersible pump unit.
From above, the utility model discloses in set up the sensor through the below at electric submersible pump unit, the equal downhole data such as temperature, pressure that can real-time detection electric submersible pump unit position department at any time, the production management of being convenient for also plays certain guard action to electric submersible pump unit. Simultaneously the charge pump production and the production of trading the layer can go on simultaneously, compare in the tubular column structure that adopts the Y to connect among the prior art, the tubular column external diameter of this embodiment is littleer, can be applicable to the oil well that the sleeve pipe internal diameter is less than or equal to 7 cuns, is applicable to the less offshore oil well production of wellhead. In addition, the butt joint pipe column is matched with the layered production allocation pipe column, when the pump is detected, the layered production allocation pipe column does not need to be lifted, the butt joint pipe column only needs to be lifted, the pump detection operation is more convenient and faster, and the whole pipe column is simple in structure.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: does the utility model provides a structural schematic diagram of layering oil production pipe column.
FIG. 2: does the utility model provides a structural section view of the anti-falling device.
FIG. 3: do the utility model provides a top view of anti falling ware.
The reference numbers illustrate:
1. butting pipe columns;
11. a downhole safety valve; 12. a cable-passing packer; 13. an anti-drop device; 131. an outer tube; 132. a mandrel; 1321. a central axial through hole; 1322. a flow guide axial through hole;
14. an oil drain device; 15. a check valve; 16. an electric submersible pump unit; 17. a sensor; 18. a secondary butt-joint device; 19. butting the cables;
2. a separate-layer production allocation pipe column;
21. a release connector; 22. a production allocation cable; 23. a production allocation component; 231. a production allocation packer; 232. a production allocator; 24. plugging with a thread;
3. a sleeve; 4. an oil layer section is applied; 5. and (4) a lower oil layer section.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the embodiment provides a layered oil production string, which includes a vertically arranged and vertically butted docking string 1 and a layered production allocation string 2, where the docking string 1 includes an electric submersible pump unit 16, a sensor 17 capable of detecting temperature and pressure at the electric submersible pump unit 16, and a secondary docking connector 18, the layered production allocation string 2 includes a releasing connector 21 and a plurality of production allocation assemblies 23, which are sequentially connected from top to bottom, and the secondary docking connector 18 can dock with the releasing connector 21.
The submersible electric pump unit 16 is an underground part of the submersible electric pump, and specifically, the submersible electric pump is composed of three parts, namely an underground part (comprising a multistage centrifugal pump, a submersible motor, a protector and a separator), a middle part (a submersible cable) and a ground part (comprising a control screen, a transformer and a junction box), namely, the submersible electric pump unit 16 comprises a multistage centrifugal pump, a submersible motor, a protector and a separator, and can lift crude oil in an oil well to the bottom surface. In use, the submersible cable (not shown in fig. 1) is connected at its lower end to the submersible motor in the electrical submersible pumping unit 16 and at its upper end to the control screen in the uphole section.
The sensor 17 is generally a sensor dedicated to the electric pump, and can detect downhole data such as temperature, pressure, etc. at the same time, for example, the sensor 17 may be a downhole measurement and control system of the oil production well real-time dynamic monitoring device JWY-150, and can detect data such as temperature, pressure, submergence, electric pump current, etc. at the electric submersible pump unit 16. When the detected data is no longer in the normal range, the operator takes corresponding measures to protect the electric submersible pump assembly 16 from normal operation. Of course, in practical applications, other types of sensors 17 may be selected as needed, as long as they can detect data such as temperature, pressure, and submergence, and this embodiment is merely an example.
The sensor 17 is electrically connected with a control screen on the ground, specifically: generally, an upper flange interface is arranged at the upper end of the sensor 17, a lower flange interface is arranged at the lower end of the electric submersible pump unit 16, the upper flange interface and the lower flange interface are fixed by bolts during installation, the sensor 17 penetrates through the two flange interfaces through a thin cable and then is electrically connected with the submersible cable inside the electric submersible pump unit 16, a display cabinet is electrically connected with the control screen through the thin cable on the ground, and the display cabinet is used for displaying data detected by the sensor 17 in real time and facilitating observation. Wherein, electrically connecting sensor 17 with the submersible cable can utilize the submersible cable to provide power for sensor 17 on the one hand, and utilize the submersible cable to transmit signals on the other hand.
The multiple production allocation assemblies 23 correspond to different oil layer sections respectively, and the number of the production allocation assemblies is the same as the number of the oil layer sections into which the oil layer needs to be divided, for example, when the oil layer section shown in fig. 1 is divided into two layers, namely an upper oil layer section 4 and a lower oil layer section 5, two production allocation assemblies 23 are arranged. The secondary butt joint device 18 and the releasing connector 21 are connecting tools of the butt joint pipe column 1 and the separate-layer production allocation pipe column 2, and after the butt joint of the two, the connected cables are in signal communication, so that the opening and closing of the plurality of production allocation components 23 can be controlled respectively, and the separate-layer oil extraction is finished. The releasing connector 21 has two functions, firstly, when the separate-layer production allocation tubular column 2 is put in, the releasing connector 21 is pressed by oil pipes, the releasing is released by the releasing connector 21, simultaneously, the anchor tile of the releasing connector 21 is opened, and the separate-layer production allocation tubular column 2 is suspended in the casing 3 together with a production allocation packer 231 described below; another function is to enable docking with the secondary dockee 18. The specific structure of the electrical submersible pump and the specific structure of the secondary docking connector 18 and the release connector 21 are the prior art and will not be described in detail herein.
Therefore, in the embodiment, the sensor 17 is arranged below the electric submersible pump unit 16, so that the downhole data such as temperature, pressure and the like at the position of the electric submersible pump unit 16 can be detected in real time at any time, production management is facilitated, and the electric submersible pump unit 16 is protected to a certain extent. Simultaneously the charge pump production and the production of trading the layer can go on simultaneously, compare in the tubular column structure that adopts the Y to connect among the prior art, the tubular column external diameter of this embodiment is littleer, can be applicable to 3 internal diameters less than or equal to 7 cun oil wells of sleeve pipe, is applicable to the less offshore oil well production of wellhead. In addition, the butt joint pipe column 1 is matched with the layered production allocation pipe column 2, when the pump is detected, the layered production allocation pipe column 2 does not need to be lifted, only the butt joint pipe column 1 needs to be lifted, the pump detection operation is more convenient and faster, and the whole pipe column is simple in structure.
In a specific implementation manner, each production allocation assembly 23 comprises a production allocation device 232 and a production allocation packer 231 arranged above the production allocation device 232, the release connector 21 is electrically connected with the plurality of production allocation devices 232 through a production allocation cable 22, and the bottom end of the layered production allocation tubular column 2 is further connected with a plug 24 so as to seal the bottom of the oil pipe. The outer wall of the butting pipe column 1 is provided with a butting cable 19, and the lower end of the butting cable 19 is electrically connected with the secondary butting connector 18.
Wherein, two adjacent production allocation assemblies 23 are generally connected through oil pipes, and the bottom end production allocator 232 is connected with the plug 24 through oil pipes. The production allocation packer 231 is used for sealing the oil casing annulus so as to divide the oil layer into a plurality of oil layer sections, and the production allocation packer 231 is also provided with a through hole for the production allocation cable 22 to pass through. The production allocation device 232 is used for receiving ground signals through the production allocation cable 22 to open or close a liquid inlet hole of the production allocation device 232. The present stimulation cable 22 functions primarily to provide power to each stimulation tool 232 and to transmit surface commands. The specific structure of the production allocation packer 231 and the production allocation device 232 is also prior art and will not be described herein. In use, the upper end of the docking cable 19 extends out of the wellhead and is connected to a mobile terminal (e.g. a computer) on the surface. The working process of the whole layering pipe column is explained in detail as follows:
firstly, the separate-layer production allocation tubular column 2 is put in by using an oil pipe tubular column, at the moment, the liquid inlet hole of each production allocation device 232 is in a closed state, after the tubular column is put in a specified position, each production allocation packer 231 is set by pressing through the oil pipe, the pressure of the oil pipe is improved, the anchor tile of the releasing connector 21 is expanded to lock the sleeve 3, and meanwhile, the releasing is released, so that the separate-layer production allocation tubular column 2 is hung in the sleeve 3.
And secondly, the oil pipe column is lifted up and put into the docking pipe column 1, the lower end of the secondary docking connector 18 is inserted and docked with the upper end of the releasing connector 21 at the moment, 5 tons of ballast is carried out, the well mouth is set after docking is finished, and the Christmas tree is installed. After the butt joint is finished, the butt joint cable 19 is connected with the production allocation cable 22, and signal communication is achieved.
Finally, the computer on the ground is connected with the upper end of the butt-joint cable 19, the liquid inlet hole of the production allocator 232 is opened by sending an instruction by using a computer program, and then the corresponding oil layer section is opened, so that the opening and closing of the plurality of production allocator 232 are separately controlled by transmitting a ground instruction through the cable. After the corresponding oil layer section is opened, the electric submersible pump unit 16 is started through a control screen of the electric submersible pump on the ground, and layered oil extraction operation is carried out. In the stratified oil production operation, according to the wellhead sampling test, the production data such as water content of the opened oil layer section can be detected, so that whether the opened oil layer section is a high water-bearing layer or not is judged, and the layer position of the oil layer section needing to be closed and opened is determined. The computer program is then used to transmit an open or close command to each of the production distributors 232 via the production distribution cable 22 to complete the zonal oil recovery.
The layered oil production operation of the whole pipe column is adjusted by a ground computer, so that the liquid production amount of any oil interval can be adjusted, the liquid output of an invalid oil interval is closed or reduced, the yield of a main production layer is further improved, and the whole pipe column is simple and convenient to operate.
Further, in order to facilitate normal oil production and circular well flushing on an offshore operation platform with a small wellhead platform area, the docking pipe column 1 further comprises an oil drain 14 arranged above the electric submersible pump unit 16.
In this way, the oil drain device 14 replaces the position of the sliding sleeve in the prior art, and the opening and closing of the communication channel between the oil pipe and the casing 3 can be realized. An oil drainage pin, such as a copper nail, can be arranged in the oil drainer 14, when the oil drainer is used, a collision rod is thrown into the pipe column from the well mouth to knock the oil drainage pin open, at the moment, the oil drainer 14 is opened, the oil pipe and the sleeve 3 can be communicated, and the circulating well washing operation can be carried out.
In practical application, in order to regularly wax the tubular column to avoid pipeline blockage, modes such as mechanical wax scraping of a wax scraper, chemical agent wax removal injected by a chemical injection method, thermal washing and electric heating wax removal and the like are generally utilized, wherein the chemical wax removal cost is high and incomplete, and the mechanical wax removal is low in cost, simple in structure and most widely applied. For mechanical paraffin removal, a plumb bob is generally arranged below a paraffin scraping sheet of the paraffin scraper to increase a counterweight due to the small volume and light weight of the paraffin scraper. The steel wire operation device adopted in the mechanical wax scraping process is much smaller in volume than the steel wire operation device used for sliding sleeve operation in the prior art, so that the mechanical wax scraping process can be suitable for offshore platforms.
However, when mechanical paraffin removal operation is performed, the condition that the paraffin scraper falls into the well due to the breakage of the steel wire often exists, and for the structure of the pipe column provided with the oil drainer 14 in the embodiment, the falling of the paraffin scraper can break the oil drainer 14, so that the oil pipe is communicated with the sleeve 3, the risk that crude oil cannot be lifted to the ground is caused, and the falling of the paraffin scraper can damage the electric submersible pump unit 16. In addition, not only the dropping of the wax scraper, but also the dropping of other tools (e.g., pliers, wrench) into the well can easily cause the drain 14 to open, posing a risk. To avoid this risk, the docking column 1 described above further comprises a drop preventer 13 arranged above the oil drain 14 to prevent the wax preventer from dropping.
In detail, the oil drain 14 is connected to the drop preventer 13 through an oil pipe. As shown in fig. 2 and 3, the anti-drop device 13 includes an outer tube 131 vertically arranged, a mandrel 132 is fixed in the outer tube 131, a central axial through hole 1321 through which a plunger of the oil drain device 14 can pass and which limits the wax scraper to pass is formed in the mandrel 132, and a plurality of flow guiding axial through holes 1322 through which the wax scraper can pass are formed in the mandrel 132 and on the periphery of the central axial through hole 1321.
Wherein, generally, the outer wall of the mandrel 132 is welded and fixed with the inner wall of the outer tube 131, and a plurality of flow guiding axial through holes 1322 are uniformly arranged around the central axial through hole 1321, for example, six flow guiding axial through holes 1322 are uniformly arranged as shown in fig. 3. The central axial through bore 1321 is sized to pass a plunger of the oil drain 14 and to block passage of the wax scraper, and the deflector axial through bore 1322 is sized to block passage of the wax scraper.
Thus, in use, if the wax scraper falls into the well due to a wire breakage or the like during mechanical wax removal using the wax scraper, the wax scraper can be stopped above the mandrel 132 due to the dimensional limitation of the central axial through hole 1321 and cannot continue to fall. When the wax scraper falls over the mandrel 132 and blocks the central axial through hole 1321 from overflowing, liquid can pass through the diversion axial through hole 1322 during oil extraction to ensure normal overflowing. When the well needs to be circularly washed after oil extraction is finished, if the wax scraper falls, the wax scraper needs to be salvaged by using a salvage tool, then a collision rod is thrown into the well to open the oil drain device 14, and then the circular well washing operation can be carried out.
Therefore, the anti-dropping device 13 in the embodiment has the function of preventing dropping objects by arranging the mandrel 132 and limiting the sizes of the central axial through hole 1321 and the flow guiding axial through hole 1322, and can block the wax scraper above the mandrel 132 when falling into the well so as to prevent the wax scraper from continuously falling, so that the problem that the oil drain device 14 is broken due to the falling of the wax scraper is avoided, the electric submersible pump unit 16 is also protected, the crude oil can be normally lifted to the bottom surface, and the normal production of the oil well is ensured. Simultaneously, the falling of the object with the size larger than the diameter of the central axial through hole 1321 can be blocked, and the normal oil extraction operation is further ensured. The whole anti-falling device 13 is simple in structure, convenient to process and low in cost.
In a specific implementation, the top surface of the stem 132 is tapered to expand upward in order to facilitate the plunger of the drain 14 to enter the central axial through hole 1321 during use. The diameter of the diversion axial through hole 1322 is generally determined according to the diameter of an oil pipe in a pipe column, the diameter of the oil pipe adopted on a general offshore platform is smaller, the internal space of the oil pipe is smaller, and the diameter of the diversion axial through hole 1322 is smaller than that of the central axial through hole 1321. Depending on the diameter of the flow guide axial through hole 1322, the plunger of the oil drain 14 may also pass through the flow guide axial through hole 1322.
Further, the whole layered oil production string further comprises a wax scraper, the diameter of the central axial through hole 1321 is larger than the diameter of a ram of the oil drainer 14 and smaller than the diameter of a plumb bob of the wax scraper, and the diameter of the flow guide axial through hole 1322 is smaller than the diameter of the plumb bob of the wax scraper. In practical application, the diameter of the central axial through hole 1321 is generally 3-5 mm smaller than the diameter of the plumb of the wax scraper, and the diameter of the central axial through hole 1321 is generally 6-8 mm larger than the diameter of the plunger of the oil drain 14.
Further, since the speed of the plunger is rapidly reduced by a constant impact with the mandrel 132 when the plunger passes through the central axial through hole 1321 when the plunger is put into the well, the distance between the drop preventer 13 and the drain pan 14 is 300m or more in order to ensure a large impact force when the plunger falls onto the drain pan 14.
Thus, after the plunger passes through the mandrel 132, the plunger accelerates within a distance of more than 300m, and further has a large enough impact force when falling onto the drain 14, so that the drain pin on the drain 14 can be smoothly knocked away.
Further, in order to simultaneously perform the wax-proof function of the entire drop preventer 13 during the oil well production process, the material of the mandrel 132 is an alloy material.
Therefore, when crude oil passes through the mandrel 132, the mandrel 132 made of alloy material contacts flowing crude oil to form a special electrochemical catalyst body, an electric field is formed between the electrochemical catalyst body and fluid, so that the fluid generates a polarization effect, and meanwhile, an electrochemical reaction is carried out, so that the electronic structure of wax molecules can be changed, the agglomeration behavior of wax crystals is further changed, paraffin in the crude oil is prevented from forming paraffin crystals to precipitate to form solid deposition, the emulsification structure of the crude oil is more stable, and the paraffin prevention effect is achieved.
In practical applications, the alloy material generally contains multiple noble metals such as Cu, Ni, Zn, Re, Pb, Fe, Sn, Co, and Ag at the same time, so as to achieve better wax control effect. Of course, the alloy material may be made of other noble metals as needed, and this embodiment is merely an example.
Further, in order to further enhance the wax-proof effect of the drop preventer 13, a nano ferromagnetic powder layer is provided on the inner wall of the outer tube 131.
Wherein, the outer wall of the upper end and the outer wall of the lower end of the outer pipe 131 are provided with external threads so as to connect and fix the upper and lower pipe columns. The nanometer strong magnetic powder can effectively change the ordered movement of wax molecules in the crude oil, reduce the winding among long-chain hydrocarbon molecules, promote the disconnection of hydrogen bonds, prevent the paraffin crystals from forming according to the crystallization requirement, prevent the growth and aggregation of the paraffin crystals, generate micromolecule microcrystals suspended in the crude oil and play a role in wax control. Thus, the arrangement of the mandrel 132 made of the alloy material and the nano strong magnetic powder layer forms two wax-proof modes which act simultaneously, and the source flow is ensured to be unimpeded, and the pipe wall is clean and free of wax deposition.
In practical application, the nano strong magnetic powder layer is made of neodymium iron boron powder, the neodymium iron boron powder has the characteristic of permanent magnetic strong magnetism, the effective period is long, the general strong magnetism can keep the effective period of about three years, and the normal production cycle use of the electric pump well can be met. Of course, a nano ferromagnetic powder layer of other materials may be used as needed, and this embodiment is merely an example. It should be noted that the above reactions between the alloy and the crude oil and the reactions between the strong magnetic and the crude oil are prior art, and are not described in detail herein.
Further, the above-mentioned docking string 1 further comprises an over-cable packer 12 disposed above the drop preventer 13 and a downhole safety valve 11 disposed above the multi-cable packer.
The through cable packer 12 mainly plays a role in sealing the oil casing annulus, and meanwhile, a cable through hole is formed in the through cable packer, so that cables (the submersible cable and the butt cable 19) can pass through the through cable packer. The underground safety valve 11 can rapidly close an oil pipe under emergency conditions to prevent blowout, so that the aims of protecting the safety of an oil well and protecting the ecological environment are fulfilled.
In practical application, in order to prevent the pump from being damaged due to the fact that liquid in the oil pipe falls back to cause reverse rotation of the pump after the pump is stopped, a check valve 15 is arranged between the oil drain 14 and the electric submersible pump unit 16 to guarantee the use safety of the pump. It should be noted that the specific structures of the oil drain 14, the wax scraper, the check valve 15 and the downhole safety valve 11 are all the prior art, and are not described herein again.
In conclusion, the layering pipe column in the embodiment is simple in structure, can be used for opening and closing any oil layer section, and effectively relieves interlayer contradiction; the electric submersible pump can realize the re-layering production of the oil layer under the action state, open the main production layer and close the high water-bearing layer, thereby improving the oil extraction speed of the oil well. Meanwhile, the underground data such as temperature, pressure and the like at the electric submersible pump unit 16 can be detected while oil well production is carried out, and production management is facilitated. In addition, the arrangement of the underground safety valve 11 and the cable-passing packer 12 can meet the safety and environmental protection requirements of offshore oil well production, and the normal production of the oil well is ensured.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (11)
1. A layered oil production pipe column is characterized by comprising a butt joint pipe column and a layered production allocation pipe column which are vertically arranged and are butted up and down;
the butt joint tubular column comprises an electric submersible pump unit, a sensor and a secondary butt joint device, wherein the electric submersible pump unit, the sensor and the secondary butt joint device are sequentially connected from top to bottom, the sensor can detect the temperature and the pressure at the position of the electric submersible pump unit, the layered production allocation tubular column comprises a releasing connector and a plurality of production allocation components, the releasing connector and the plurality of production allocation components are sequentially connected from top to bottom, and the secondary butt joint device can be in butt joint with the releasing connector.
2. The layered production string of claim 1,
each production allocation assembly comprises a production allocation device and a production allocation packer arranged above the production allocation device, the releasing connector is electrically connected with the plurality of production allocation devices through production allocation cables, and the bottom end of the layered production allocation tubular column is also connected with a plug; and a butt joint cable is arranged on the outer wall of the butt joint pipe column, and the lower end of the butt joint cable is electrically connected with the secondary butt joint device.
3. The layered production string of claim 1,
the butt joint pipe column further comprises an oil drain device arranged above the electric submersible pump unit.
4. The layered production string of claim 3,
the butt joint pipe column further comprises an anti-falling device arranged above the oil drain device.
5. The layered production string of claim 4,
the anti-falling device comprises an outer pipe vertically arranged, a mandrel is fixed in the outer pipe, a central axial through hole which can be used for a collision rod of the oil drain device to penetrate and limit the wax scraper to penetrate is formed in the mandrel, and a plurality of flow guide axial through holes which can limit the wax scraper to penetrate are formed in the periphery of the central axial through hole.
6. The layered production string of claim 5, further comprising a wax scraper;
the diameter of the central axial through hole is larger than the diameter of a collision rod of the oil drain device and smaller than the diameter of a plumb bob of the wax scraper, and the diameter of the flow guide axial through hole is smaller than the diameter of the plumb bob of the wax scraper.
7. The layered production string of claim 5,
the distance between the anti-falling device and the oil drainer is more than or equal to 300 m.
8. The layered production string of claim 5,
the mandrel is made of alloy materials, and a nano strong magnetic powder layer is arranged on the inner wall of the outer tube.
9. The layered production string of claim 4,
the butt joint pipe column further comprises a cable passing packer arranged above the drop preventer.
10. The layered production string of claim 9,
the butt joint pipe column further comprises a downhole safety valve arranged above the cable packer.
11. The layered production string of claim 3,
and a check valve is arranged between the oil drainer and the electric submersible pump unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020032072.5U CN211851685U (en) | 2020-01-08 | 2020-01-08 | Layered oil production pipe column |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020032072.5U CN211851685U (en) | 2020-01-08 | 2020-01-08 | Layered oil production pipe column |
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| CN211851685U true CN211851685U (en) | 2020-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431533A (en) * | 2021-08-09 | 2021-09-24 | 克拉玛依市尚正石油科技有限公司 | Underground cable wet butt joint oil-submersible pump layered oil extraction device |
-
2020
- 2020-01-08 CN CN202020032072.5U patent/CN211851685U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431533A (en) * | 2021-08-09 | 2021-09-24 | 克拉玛依市尚正石油科技有限公司 | Underground cable wet butt joint oil-submersible pump layered oil extraction device |
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