CN115807652A - Stratum eddy current heating thickened oil recovery system - Google Patents
Stratum eddy current heating thickened oil recovery system Download PDFInfo
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- CN115807652A CN115807652A CN202211604616.0A CN202211604616A CN115807652A CN 115807652 A CN115807652 A CN 115807652A CN 202211604616 A CN202211604616 A CN 202211604616A CN 115807652 A CN115807652 A CN 115807652A
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- eddy current
- current heating
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- viscosity reducer
- heating
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Abstract
The invention relates to the technical field of thickened oil exploitation in oilfield development, and particularly discloses a stratum eddy current heating thickened oil exploitation system which comprises an oil exploitation well, a cable, an electric heating well, an alternating current control unit, a data acquisition unit, a data analysis unit, a viscosity reducer feeding pipe, a feeding pump and a viscosity reducer charging bucket; a modified viscosity reducer is filled in the viscosity reducer barrel; a plurality of eddy current heating devices electrically connected with the alternating current control unit are arranged in the electric heating well; the eddy current heating device comprises a cylindrical heat conduction pipe, an insulating end cover, a current conductor and insulating filler; the eddy current heating devices and the cables are connected through soft joints. The integrated level is high, the installation and the use are convenient, the maintenance is convenient and fast, and the device can also be suitable for heating the thickened oil of various stratum oil production wells.
Description
Technical Field
The invention relates to the technical field of thickened oil exploitation in oilfield development, in particular to a stratum eddy current heating thickened oil exploitation system.
Background
The heavy oil is usually produced by reducing viscosity, and the conventional operation of reducing viscosity is to heat the heavy oil. The conventional thick oil heating technologies comprise steam huff and puff, steam flooding, in-situ combustion, thermal assisted gravity drainage (SAGD) and the like, however, the technologies have the defects of high operation difficulty, large equipment, high energy consumption and the like. To this end, the invention patent application No. 201621244769.9 provides a formation eddy current heated heavy oil recovery system. The system is characterized in that electric heating wells are drilled at two sides of an oil production well, because bottom water or bound water (namely a conductor) exists in a stratum, an alternating magnetic field is generated by the electric heating wells, eddy currents can be generated in the stratum under the action of the alternating magnetic field, electric energy is converted into heat energy, and accordingly thick oil in the stratum is directly heated. The system has the advantages of simple equipment, small volume and good use effect. However, this system still suffers from the following drawbacks: (1) The difficulty of construction is high, a metal sleeve needs to be arranged at the bottom of the electric heating well, and an insulating sleeve short joint needs to be arranged at the top of the electric heating well, so that the operation difficulty is high, and the installation is inconvenient; (2) The integration level is not high, once problems occur, the maintenance and the replacement are troublesome and the time consumption is long, and the mining progress is delayed; (3) For a larger oil production well, only one straight-through heating structure is seriously insufficient, a plurality of heating structures need to be drilled again, and cables are connected independently, so that time, labor and cost are wasted; (4) For a production well with a deeper depth, the rigid heating structure which cannot be bent is difficult to adapt to all heating wells, and is likely to be damaged after being used for a long time; (5) The electric quantity is greatly consumed, and the method is not suitable for the exploitation of the super heavy oil.
Disclosure of Invention
The invention aims to provide a stratum eddy current heating thickened oil recovery system which is high in integration level, convenient to install and use, convenient and quick to maintain and repair, and also suitable for viscosity reduction recovery of thickened oil or ultra-thickened oil of various stratum oil recovery wells.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a stratum eddy current heating thickened oil recovery system comprises an oil recovery well, a cable, electric heating wells arranged on two sides of the oil recovery well, and an alternating current control unit connected with the electric heating wells through the cable; the system also comprises a data acquisition unit and a data analysis unit which are connected with the alternating current control unit, a viscosity reducer feeding pipe which is arranged on the electric heating well wall in a penetrating way and is communicated with the oil production well, a feeding pump which is connected with the viscosity reducer feeding pipe, and a viscosity reducer material barrel which is connected with the feeding pump; a modified viscosity reducer is filled in the viscosity reducer barrel; a plurality of eddy current heating devices are connected in parallel or/and sequentially in the electric heating well, and the eddy current heating devices are electrically connected with the alternating current control unit; the eddy current heating device comprises a cylindrical heat pipe, insulating end covers arranged at two ends of the cylindrical heat pipe, current conductors arranged in the heat pipe, and insulating fillers filled among the heat pipe, the insulating end covers and the current conductors, wherein two ends of the current conductors respectively penetrate through the corresponding insulating end covers; the eddy current heating devices and the cables are connected through soft joints.
As a preferred scheme, the viscosity reducer comprises modified lignin, a coemulsifier and a saline solution; the modified lignin is modified by strong acid solution, then the non-ionic surfactant is added for mixing and modification, and then the alkali liquor is added for modification. The auxiliary emulsifier is one or more of potassium fatty acid, sodium petroleum sulfonate, fatty alcohol-polyoxyethylene ether, sodium dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene alcohol sodium sulfate, polyoxyethylene ether sodium sulfonate, coconut oil diethanolamide and alkyl glycoside.
As a preferable scheme, the strong acid solution is sulfuric acid and/or nitric acid, the mass of the strong acid is 5-20% of that of lignin, and the strong acid and the lignin are stirred at 90-110 ℃ to react, so that the lignin is primarily modified;
the nonionic surfactant is alkylphenol polyoxyethylene ether surfactant, polyoxyethylene fatty alcohol ether surfactant, polyoxyethylene fatty acid ester surfactant, polyalcohol fatty acid ester surfactant and polyoxyethylene polyalcohol fatty acid ester surfactant, the mass of the nonionic surfactant is 5-10% of that of lignin, and the nonionic surfactant and the lignin are stirred for reaction at 40-100 ℃ to modify the lignin again;
the alkali liquor is sodium carbonate and/or sodium hydroxide, the mass of the alkali liquor is 15-35% of that of the lignin, the alkali liquor and the lignin are stirred at 40-110 ℃ to react, and the lignin is finally modified to obtain the modified lignin.
Preferably, the soft joint comprises an internal lead, a cylindrical insulating hose wrapping the outside of the lead, and an internal thread joint detachably connected to the end part of the insulating hose; the lead is connected with the heat conduction pipe or the cable at the corresponding position; the female adapter is detachably connected with the insulating end cover at the corresponding position.
As a preferable scheme, a plurality of grooves are formed in the insulating end cover, and a plurality of protrusions matched with the grooves are formed in the end portion of the insulating hose.
Preferably, the soft joint is a two-way joint, a three-way joint or a four-way joint, and the outer diameter of the soft joint is smaller than the outer diameter of the heat conducting pipe.
As a preferable scheme, the eddy current heating apparatus further includes an omega-shaped hoop disposed outside the heat conduction pipe, and the hoop fixes the heat conduction pipe to the inner wall of the electric heating well at a corresponding position through a bolt.
As a preferred scheme, the lifting rope device further comprises a support, a rotating shaft which is rotatably connected to the support, a rotating motor which is connected with the rotating shaft and drives the rotating shaft to rotate, and a lifting rope which is wound on the rotating shaft.
As a preferable scheme, at least three connecting lugs are uniformly arranged at the edge of the insulating end cover, and all the connecting lugs are connected with the lifting rope.
As a preferred scheme, the data acquisition unit includes a plurality of pressure sensor and a plurality of temperature sensor, and is a plurality of pressure sensor links to each other with the oil recovery well inner wall of cylindric heat pipe, insulating end cover, soft joint, viscosity breaker filling tube, the different degree of depth respectively, and is a plurality of temperature sensor links to each other with the oil recovery well inner wall of heat pipe, cable, soft joint, viscosity breaker filling tube, the different degree of depth respectively.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention comprises a plurality of eddy current heating devices which are connected in sequence or in parallel for use according to requirements, can adapt to heating wells with different depths and widths, and has strong universality; moreover, the eddy current heating device is high in integration degree, convenient to install and disassemble, simple and rapid to maintain and free of delaying the progress of a project.
(2) The invention also provides a data acquisition unit and a data analysis unit, wherein the data acquisition unit is used for acquiring relevant pressure-bearing and temperature data in the electric heating well and the oil extraction well and transmitting the data to the data analysis system, the data analysis system estimates the information such as well liquid outlet viscosity, ground pipeline length and the like according to the acquired data and manually inputs the information such as local season air temperature and the like, the heating power additional coefficient is calculated within a reasonable error range, and the information is transmitted to the main system or the alternating current control unit so as to control the eddy current parameters. The number of eddy current heating apparatuses to be mounted and the mounting method thereof may be determined based on the estimated data.
(3) The invention also sets viscosity reducer, which is a method for improving recovery efficiency with ideal effect, and the thick oil emulsification viscosity reduction is realized by reducing the oil-water interfacial tension to convert the thick oil in the stratum from water-in-oil emulsification state to oil-in-water emulsification state, so that the viscosity of the thick oil is greatly reduced, thereby reducing the flow resistance and improving the recovery efficiency. The viscosity reducer is additionally arranged aiming at the super-thick oil, if the super-thick oil is heated only by the eddy current, on one hand, the voltage needs to be increased to increase the temperature, the time consumption is long, the energy consumption is high, and on the other hand, the eddy current heating device has high loss and is easy to damage; therefore, the viscosity reducer is creatively combined for use, the viscosity reducer can be subjected to primary viscosity reduction by injection, the viscosity reducer contains saline water and other electric ions, the electric eddy current heating effect can be enhanced, the viscosity reducer and the saline water are combined to generate the effect of 1+1 & gt 2, the viscosity reducer is not consumed, and the burden of an electric eddy current heating device is not increased.
(4) The viscosity reducer is prepared by mixing modified lignin, a co-emulsifier and a saline solution, the lignin is wide in source and low in cost, no waste liquid, waste residue and waste gas are discharged in the modification process, the modification condition is easy to achieve, the modification operation is simple, and the environment is protected. In addition, the modified lignin has good self-emulsifying property for the thickened oil and emulsion is stable. More importantly, the viscosity reducer has good high temperature resistance, does not have obvious attenuation at 200 ℃, and can realize nondestructive emulsification and eddy current heating viscosity reduction simultaneously when used with an eddy current heating device during soaking.
(5) The shell (namely the heat conduction pipe) of the eddy current heating device is arranged into the heat conduction copper alloy pipe, so that a magnetic field generated by a current conductor in the shell can act on both the thick oil and the copper alloy pipe to heat the copper alloy pipe; the copper alloy pipe can also transfer heat to the adjacent thick oil, so that the heating efficiency is improved, and the energy waste is reduced; and the arrangement of the insulating filler and the insulating end cover can also avoid the heat of the heat conducting pipe from being transferred to the internal current conductor, thereby avoiding the damage of the current conductor.
(6) The invention innovatively adopts the design of the soft joint, such as a common pipeline joint, can be arranged into a two-way joint, a three-way joint or a four-way joint according to the requirement, and is softer compared with a point eddy current heating device, when a heating well is deep and narrow, the too long eddy current heating device is easy to bend and damage, and the soft joint is adopted, so that on one hand, the length of each eddy current heating device can be shortened, the weight of each eddy current heating device is lightened, and the eddy current heating devices are easier to fix; on the other hand, when the circuit fault or the product is damaged, the circuit fault or the product can be detected and replaced without delaying the project progress; in addition, in the heating well in which the eddy current heating device is inconvenient to fix, the eddy current heating device can be obliquely arranged, the eddy current heating device is slightly inclined, two ends of the eddy current heating device are respectively abutted against the inner wall of the heating well, so that the inner wall of the heating well can support the eddy current heating device, and the soft joint plays a role in connecting and preventing the two connected eddy current heating devices from being staggered.
(7) The two ends of the soft joint are both provided with a section of hard pipe material, the part is provided with external threads, and the part is in threaded connection with a matched internal thread joint; after the wire is aligned with the current conductor in the heat conducting pipe at the corresponding position, the wire can be stably connected with the current conductor only by screwing the internal thread joint to ensure that the movable end of the internal thread joint is in threaded connection with the external thread of the corresponding heat conducting pipe. And the soft joint can be arranged at the joint of the eddy current heating device and the cable, but the soft joint can be infinitely elongated until the cable can be directly connected with the inner conductor of the soft joint and then only needs the adhesive tape to be wound and sealed, and the conductor in the soft joint can be directly replaced by the cable.
(8) The insulating end cover is provided with the plurality of grooves, and the end part of the insulating hose is provided with the plurality of bulges matched with the grooves, so that the insulating end cover and the insulating hose can be conveniently connected.
(9) The outer diameter of the soft joint is smaller than that of the heat conduction pipe, and correspondingly, the cross section of the middle part of the female adapter is also in an isosceles trapezoid shape, so that the connection length of the female adapter, the soft joint and the eddy current heating device can be more conveniently mastered, and looseness is avoided.
(10) The invention also arranges an omega-shaped hoop outside the heat conduction pipe, so as to fix the whole eddy current heating device on the inner wall of the electric heating well at the corresponding position, reduce the burden of the eddy current heating device below and avoid the deformation and damage of the eddy current heating device below.
(11) The invention is also provided with a bracket, a rotating shaft and a rotating motor, which are used for hoisting the whole eddy current heating device to the lower heating well and reducing the difficulty of manual operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of the electric eddy current heating apparatus according to the present invention;
FIG. 3 is a schematic structural view of an electric eddy current heating apparatus according to the present invention;
FIG. 4 is a schematic top view of an eddy current heating apparatus with engaging lugs according to the present invention;
FIG. 5 is a schematic cross-sectional view of an electric eddy current heating apparatus according to the present invention;
FIG. 6 is a schematic view of the structure of the flexible joint (two-way joint) of the present invention;
FIG. 7 is a schematic view of the structure of the flexible joint (cross joint) of the present invention;
FIG. 8 is a schematic top view of the flexible joint of the present invention;
FIG. 9 is a schematic cross-sectional view of a female connection of the present invention;
FIG. 10 is a flow chart of the viscosity reducer of the present invention;
FIG. 11 is a diagram showing the emulsifying effect of the viscosity reducer of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-oil production well, 2-cable, 3-electric heating well, 4-alternating current control unit, 5-heat conduction pipe, 51-hoop, 6-insulating end cover, 7-current conductor, 8-insulating filler, 9-soft joint, 91-lead, 92-insulating hose, 93-internal thread joint, 10-bracket, 11-rotating shaft, 12-rotating motor, 13-lifting rope, 14-viscosity reducer feeding pipe, 15-feeding pump and 16-viscosity reducer barrel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally place when used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In detail, the purpose of this embodiment is to provide a stratum eddy current heating thickened oil recovery system, solve the low integration level, the installation operation degree of difficulty is big, the maintenance is inconvenient, the universality is relatively poor and fragile problem that current bottom eddy current heating thickened oil recovery system exists. The system is high in integration level, but does not influence or has little influence, the installation is simple and rapid, only an independent part needs to be processed or replaced after a problem occurs, the exploitation can be carried out, the project progress is not delayed, and the system is not only suitable for deep and narrow heating wells, but also suitable for shallow and wide heating wells.
Specifically, see fig. 1 to 9. The system comprises an oil production well 1, a cable 2, electric heating wells 3 arranged at two sides of the oil production well, and an alternating current control unit 4 connected with the electric heating wells through the cable. Wherein, when the bulk conductor is in the alternating magnetic field, the induced current can be generated in the conductor. The induced current assumes a closed vortex shape in the current streamlines in the formation, known as eddy currents or vortices. The eddy current action converts electrical energy into heat energy. Formation water (generally present in the pores of the formation rock in the form of bound water or bottom water) is contained in the pores of the formation rock. Formation water is conductive due to the large amount of dissolved mineral salts, and thus corresponds to a continuous bulk conductor. Therefore, only an alternating electromagnetic field is established between any two points in the stratum, eddy current can be generated in the stratum so as to heat stratum fluid, reduce the viscosity of stratum crude oil, and the stratum crude oil is easy to flow and is produced. For an oil reservoir without bottom water or with lower irreducible water saturation in the stratum, the stratum electric eddy current heating thickened oil exploitation is carried out after the saline water is injected manually. The setting of the alternating magnetic field, that is, the structure, the working principle, and the working process of the alternating current control unit 4 are all common knowledge in the prior art (see also "a formation eddy current heating thickened oil recovery system" mentioned in the background art), and this embodiment is not described herein again.
The improvement of the embodiment mainly comprises the following aspects:
firstly, referring to fig. 1 and 2, in the embodiment, a plurality of eddy current heating devices are connected side by side or/and sequentially in the electric heating well 3, and the eddy current heating devices are electrically connected with the alternating current control unit; the parallel connection or the sequential connection or the parallel connection and the sequential connection are both determined according to the size and the depth of the production well and the size and the depth of the heating well, which are not described in detail herein.
In order to facilitate centralized control, the present embodiment further includes a data acquisition unit and a data analysis unit connected to the alternating current control unit 4, the data acquisition unit includes a plurality of pressure sensors and a plurality of temperature sensors, the plurality of pressure sensors are respectively disposed at the positions where pressure needs to be detected, such as the cylindrical heat pipe 5, the insulating end cover 6, the soft joint 9, the viscosity reducer feeding pipe 14, and the inner walls of the oil production wells 1 at different depths of the present embodiment, and the plurality of temperature sensors are respectively disposed at the positions where temperature needs to be detected, such as the heat pipe 5, the cable 2, the soft joint 9, the viscosity reducer feeding pipe 14, and the inner walls of the oil production wells 1 at different depths of the present embodiment. The data acquisition unit is used for acquiring related pressure-bearing and temperature data in the electric heating well and the oil extraction well and transmitting the data to the data analysis system, the data analysis system estimates the viscosity of the well effluent, the length of a ground pipeline and other information according to the acquired data, and manually inputs the information such as local seasonal temperature and the like, calculates the additional coefficient of heating power within a reasonable error range, and transmits the information to the main system or the alternating current control unit so as to control the eddy current parameters. The number of eddy current heating apparatuses to be mounted and the mounting method thereof may be determined based on the estimated data.
The data acquisition unit, the data analysis unit, the main control system, and the like mentioned in this embodiment, such as the alternating current control unit, are all directly selected from the conventional systems in the art, and the installation manner, the use method, the working principle, and the like thereof are also the same.
In order to reduce the energy consumption of the eddy current heating device, improve the viscosity reduction effect, and achieve the purpose of 1+1 > 2, the embodiment further includes a viscosity reducer feeding pipe 14 penetrating the wall of the electric heating well 3 and communicating with the oil production well 1, a feeding pump 15 connected with the viscosity reducer feeding pipe 14, and a viscosity reducer charging bucket 16 connected with the feeding pump; and the viscosity reducer barrel is internally provided with a modified viscosity reducer. The thick oil emulsification viscosity reduction is an ideal method for improving the recovery efficiency, and the thick oil in the stratum is changed from a water-in-oil emulsification state to an oil-in-water emulsification state by reducing the oil-water interfacial tension, so that the viscosity of the thick oil is greatly reduced, the flow resistance is reduced, and the recovery efficiency is improved. The viscosity reducer is additionally arranged aiming at the super-thick oil, if the super-thick oil is heated only by the eddy current, on one hand, the voltage needs to be increased to improve the temperature, the time consumption is long, the energy consumption is high, and on the other hand, the eddy current heating device has high loss and is easy to damage; therefore, the viscosity reducer is creatively combined with the viscosity reducer for use, the viscosity reducer can be subjected to primary viscosity reduction by injection, the viscosity reducer contains saline water and other electric ions, the electric eddy current heating effect can be enhanced, the viscosity reducer and the saline water are combined to generate the effect of 1+1 > 2, and the viscosity reducer is not consumed and the burden of an electric eddy current heating device is not required to be increased.
Wherein, referring to fig. 10, the viscosity reducer comprises modified lignin, a co-emulsifier, and a brine solution; the modified lignin is modified by strong acid solution, then the non-ionic surfactant is added for mixing and modification, and then the alkali liquor is added for modification. The auxiliary emulsifier is one or more of potassium fatty acid, sodium petroleum sulfonate, fatty alcohol-polyoxyethylene ether, sodium dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene alcohol sodium sulfate, polyoxyethylene ether sodium sulfonate, coconut oil diethanolamide and alkyl glycoside.
The strong acid solution is sulfuric acid and/or nitric acid, the mass of the strong acid is 5-20% of that of the lignin, and the strong acid solution and the lignin are stirred at 90-110 ℃ to react, so that the lignin is preliminarily modified;
the nonionic surfactant is alkylphenol polyoxyethylene ether surfactant, polyoxyethylene fatty alcohol ether surfactant, polyoxyethylene fatty acid ester surfactant, polyol fatty acid ester surfactant and polyoxyethylene polyol fatty acid ester surfactant, the mass of the nonionic surfactant is 5-10% of that of lignin, the nonionic surfactant and the lignin are stirred at 40-100 ℃ to react, and the lignin is modified again;
the alkali liquor is sodium carbonate and/or sodium hydroxide, the mass of the alkali liquor is 15-35% of that of the lignin, the alkali liquor and the lignin are stirred at 40-110 ℃ to react, and the lignin is finally modified to obtain the modified lignin.
When the viscosity reducer is prepared, firstly, 20kg of water is added into a reaction kettle, 10kg of lignin is added, and the mixture is uniformly stirred to obtain a lignin aqueous solution; secondly, adding 0.5kg of 95 mass percent sulfuric acid and 0.5kg of 60 mass percent nitric acid into the lignin aqueous solution, and stirring and reacting for 2 hours at the temperature of 100 ℃; stopping heating, then adding 2kg of polyoxyethylene fatty acid ester type surfactant, stirring uniformly, and standing for 2h; then, continuously adding 1kg of sodium hydroxide and 0.5kg of sodium carbonate, uniformly stirring, and continuously reacting for 2 hours; and finally, adding a co-emulsifier and a sodium chloride aqueous solution, and cooling to obtain the thickened oil self-emulsifying viscosity reducer. Wherein, if the reaction time is shortened by increasing the reaction rate, the reaction temperature can be suitably increased.
Before use, a part of the viscosity reducer is tested to prepare an aqueous solution with the concentration of 1 mass percent, the aqueous solution is added into thick oil with the viscosity of 5000 mPa.S (50 ℃), the self-emulsifying viscosity reduction experiment is carried out at the temperature of 80 ℃, as shown in figure 11, the self-emulsifying condition is good, the viscosity reduction rate reaches more than 99 percent, the emulsion stability is good, and the viscosity reduction rate of more than 80 percent can still be maintained after 30 days. After being heated to 200 ℃, the self-emulsifying condition is still good, the viscosity reduction rate reaches more than 99 percent, the emulsion stability is good, and the viscosity reduction rate of more than 80 percent can still be maintained after 10 days, which is enough to meet the implementation requirement.
Lignin selection, like waste recovery and reuse. The lignin has wide sources and low price, no waste liquid, waste residue and waste gas are discharged in the modification process, the modification condition is easy to achieve, the modification operation is simple, and the environment is protected. In addition, the modified lignin has good self-emulsifying property to the thickened oil and stable emulsion. More importantly, the viscosity reducer has good high temperature resistance, does not have obvious attenuation at 200 ℃, and can realize nondestructive emulsification and eddy current heating viscosity reduction simultaneously when used with an eddy current heating device during soaking.
Referring to fig. 2 to 5, the eddy current heating apparatus includes a cylindrical heat pipe 5, insulating end caps 6 disposed at two ends of the cylindrical heat pipe, current conductors 7 disposed in the heat pipe 5 and having two ends respectively penetrating through the corresponding insulating end caps, and an insulating filler 8 filled between the heat pipe, the insulating end caps, and the current conductors. The arrangement of the plurality of eddy current heating devices enables the eddy current heating devices to be sequentially connected or connected side by side for use as required, so that the eddy current heating device can adapt to heating wells with different depths and widths, and has strong universality; moreover, the eddy current heating device is high in integration degree, convenient to install and disassemble, simple and rapid to maintain and free of delaying the progress of a project. And each eddy current heating device has high integration level and can be used as an independent component for installation and use, so that the installation, the use and the disassembly are more convenient. In addition, the present embodiment further comprises a bracket 10, a rotating shaft 11 rotatably connected to the bracket, a rotating motor 12 connected to the rotating shaft and driving the rotating shaft to rotate, and a lifting rope 13 wound around the rotating shaft. Correspondingly, as shown in fig. 3 and 4, 4 connecting lugs are uniformly arranged at the edge of the insulating end cover 6, and all the connecting lugs are connected with the lifting rope 13. So, whole eddy current heating device hoists into the heating well after all can assembling, greatly reduced the manual operation degree of difficulty.
When the heating well is deep and narrow, the eddy current heating devices are only required to be connected in sequence and placed in the heating well, and workers do not need to go down; when the heating well is shallow and wide, because the eddy current heating device has certain movement allowance, workers are required to go to a safe and convenient fixing position in some places, and the eddy current heating device is fixed on the wall of the heating well. In order to reduce the fixing difficulty, the hoop 51 in the shape of the omega is arranged outside the heat conduction pipe 5, the hoop fixes the heat conduction pipe 5 to the inner wall of the electric heating well at the corresponding position through the bolt, the burden of the eddy current heating device below is reduced, and the eddy current heating device at the lower part is prevented from being deformed and damaged.
Secondly, the shell (namely the heat conduction pipe) of the eddy current heating device is arranged to be a heat conduction copper alloy pipe, so that a magnetic field generated by a current conductor in the shell can act on both the thick oil and the copper alloy pipe to heat the copper alloy pipe; the copper alloy pipe can transfer heat to the adjacent thick oil, so that the heating efficiency is improved, and the energy waste is reduced; and the arrangement of the insulating filler and the insulating end cover can also prevent the heat of the heat conducting pipe from being transferred to the internal current conductor, thereby avoiding the damage of the current conductor.
Finally, as shown in fig. 2, the eddy current heating devices and the cable 2 are connected by soft joints 9. As shown in fig. 6 to 8, the soft joint 9 is a two-way joint, a three-way joint or a four-way joint, so as to facilitate operations such as sequential connection or parallel connection between the eddy current heating devices. It should be noted that the circuit connection relationship is the conventional art, and the present embodiment does not improve it, but only improves the structure except for the circuit and correspondingly adjusts the circuit connection point, so that the details are not described herein.
The soft joint is like the ordinary pipe joint, relatively to some eddy current heating device, it is softer, when the heating well is deep and narrow, the too long eddy current heating device is apt to buckle and damage, and use the soft joint, on the one hand can shorten the length of each eddy current heating device, lighten its weight, make it easier to fix; on the other hand, when the circuit fault or the product is damaged, the circuit fault or the product can be detected and replaced without delaying the project progress; in addition, in the heating well in which the eddy current heating device is inconvenient to fix, the eddy current heating device can be obliquely arranged, the eddy current heating device is slightly inclined, two ends of the eddy current heating device are respectively abutted against the inner wall of the heating well, so that the inner wall of the heating well can support the eddy current heating device, and the soft joint plays a role in connecting and preventing the two connected eddy current heating devices from being staggered.
In addition, the soft joint 9 comprises an internal lead 91, a cylindrical insulating hose 92 wrapped outside the lead, and a female joint 93 detachably connected to the end of the insulating hose; the lead 91 is connected with the heat conduction pipe 5 or the cable 2 at the corresponding position; the female adapter 93 is detachably connected with the insulating end cover 6 at the corresponding position.
In order to improve the connection stability, the two ends of the soft joint are both provided with a section of hard pipe material, the part is provided with external threads, and the part is in threaded connection with a matched internal thread joint; when the wire is aligned with the current conductor in the heat pipe at the corresponding position, the wire can be stably connected with the current conductor only by screwing the internal thread joint to ensure that the movable end of the internal thread joint is connected to the external thread of the corresponding heat pipe. And the junction of the eddy current heating device and the cable can be provided with a soft joint, but the soft joint can be infinitely elongated until the cable can be directly connected with the conducting wire in the soft joint and then only needs an adhesive tape to be wound and sealed, and the conducting wire in the soft joint can be directly replaced by the cable.
Furthermore, a plurality of grooves are formed in the insulating end cover 6, and a plurality of protrusions matched with the grooves are formed in the end portion of the insulating hose 92. The two can be convenient for it, and then make things convenient for female adapter's spiral to be fixed.
Meanwhile, in this embodiment, the outer diameter of the soft joint 9 is smaller than the outer diameter of the heat conducting pipe 5, and correspondingly, referring to fig. 9, the cross section of the middle part of the female adapter is also in an isosceles trapezoid shape, so that the connection length between the female adapter and the soft joint and the eddy current heating device can be more conveniently mastered, and looseness is avoided.
When the electric heating device is used, firstly, a corresponding number of electric eddy current heating devices are selected according to the requirement, and the electric eddy current heating devices are sequentially connected or connected side by using soft joints according to the actual condition of a heating well; taking a deep and narrow heating well as an example, after the eddy current heating devices are sequentially connected, the connecting lugs are hung on the lifting ropes, and the eddy current heating devices are sequentially placed in the heating well; starting the rotating motor, rotating the rotating shaft, gradually lengthening the lifting rope, and gradually moving the eddy current heating device downwards to the bottom of the heating well; and then adjusting the rotating speed of the rotating motor, slowly loosening the lifting rope, enabling the eddy current heating devices to be sequentially leaned against the heating well wall, and completing installation until the lifting rope has no load.
When a fault occurs, the rotating motor is only needed to be started, the lifting rope drives the electric eddy current heating device to move upwards, and meanwhile, the connection points are detected one by one to judge the fault range, so that the detection speed is high; after a fault position is found, the eddy current heating device is only needed to be removed, the eddy current heating device with the same specification is replaced, and the operation is repeated, so that the work can be continued without delaying the work progress; and the failed eddy current heating device is lifted out for maintenance and repair, so that the operation is simpler and quicker, and the difficulty is smaller.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A stratum eddy current heating thickened oil recovery system comprises an oil recovery well (1), a cable (2), electric heating wells (3) arranged on two sides of the oil recovery well, and an alternating current control unit (4) connected with the electric heating wells through the cable; the device is characterized by further comprising a data acquisition unit and a data analysis unit which are connected with the alternating current control unit (4), a viscosity reducer feeding pipe (14) which is arranged on the wall of the electric heating well (3) in a penetrating way and is communicated with the oil production well (1), a feeding pump (15) which is connected with the viscosity reducer feeding pipe (14), and a viscosity reducer barrel (16) which is connected with the feeding pump; a modified viscosity reducer is filled in the viscosity reducer barrel; a plurality of eddy current heating devices are connected in parallel or/and sequentially in the electric heating well (3), and the eddy current heating devices are electrically connected with the alternating current control unit; the eddy current heating device comprises a cylindrical heat pipe (5), insulating end covers (6) arranged at two ends of the cylindrical heat pipe, current conductors (7) arranged in the heat pipe (5) and with two ends respectively penetrating through the corresponding insulating end covers, and insulating fillers (8) filled among the heat pipe, the insulating end covers and the current conductors; the eddy current heating devices and the cable (2) are connected through soft joints (9).
2. The system for recovering heavy oil by eddy current heating of stratum according to claim 1, wherein the viscosity reducer comprises modified lignin, a co-emulsifier and a saline solution; the modified lignin is modified by strong acid solution, then the non-ionic surfactant is added for mixing and modification, and then the alkali liquor is added for modification.
3. The system for exploiting the thick oil by heating the formation eddy current according to claim 2, wherein the strong acid solution is sulfuric acid and/or nitric acid, the mass of the strong acid is 5-20% of that of lignin, and the strong acid solution and the lignin are stirred at 90-110 ℃ to react to preliminarily modify the lignin;
the nonionic surfactant is an alkylphenol polyoxyethylene ether surfactant, a polyoxyethylene fatty alcohol ether surfactant, a polyoxyethylene fatty acid ester surfactant, a polyalcohol fatty acid ester surfactant and a polyoxyethylene polyalcohol fatty acid ester surfactant, the mass of the nonionic surfactant is 5-10% of that of lignin, and the nonionic surfactant and the lignin are stirred to react at the temperature of 40-100 ℃ to modify the lignin again;
the alkali liquor is sodium carbonate and/or sodium hydroxide, the mass of the alkali liquor is 15-35% of that of the lignin, the alkali liquor and the lignin are stirred at 40-110 ℃ to react, and the lignin is finally modified to obtain the modified lignin.
4. A formation eddy current heating thickened oil recovery system as claimed in claim 1, characterized in that the soft joint (9) comprises an internal lead (91), a cylindrical insulating hose (92) wrapping the outside of the lead, and a female screw joint (93) detachably connected to the end of the insulating hose; the lead (91) is connected with the heat conduction pipe (5) or the cable (2) at the corresponding position; the female adapter (93) is detachably connected with the insulating end cover (6) at the corresponding position.
5. A stratum eddy current heating thick oil recovery system according to claim 4, wherein a plurality of grooves are formed on the insulating end cover (6), and a plurality of protrusions matched with the grooves are formed on the end portion of the insulating hose (92).
6. The formation eddy current heating thick oil exploitation system according to any one of claims 1 to 5, wherein the soft joint (9) is a two-way joint, a three-way joint or a four-way joint, and an outer diameter of the soft joint (9) is smaller than an outer diameter of the heat conduction pipe (5).
7. A formation eddy current heating thickened oil recovery system according to claim 1, characterized in that the eddy current heating apparatus further comprises an anchor ear (51) in Ω shape disposed outside the heat conducting pipe (5), and the anchor ear fixes the heat conducting pipe (5) to the inner wall of the electric heating well at the corresponding position through bolts.
8. A thick oil recovery system heated by formation eddy current as claimed in claim 1, further comprising a support (10), a rotating shaft (11) rotatably connected to the support, a rotating motor (12) connected to the rotating shaft and driving the rotating shaft to rotate, and a lifting rope (13) wound around the rotating shaft.
9. A stratum eddy current heating thick oil recovery system according to claim 8, wherein at least three connecting lugs are uniformly arranged at the edge of the insulating end cover (6), and all the connecting lugs are connected with the lifting rope (13).
10. The system for exploiting the thick oil by heating the formation eddy currents according to claim 9, wherein the data acquisition unit comprises a plurality of pressure sensors and a plurality of temperature sensors, the plurality of pressure sensors are respectively connected with the cylindrical heat-conducting pipe (5), the insulating end cover (6), the soft joint (9), the viscosity reducer feeding pipe (14) and the inner walls of the oil exploitation wells (1) with different depths, and the plurality of temperature sensors are respectively connected with the heat-conducting pipe (5), the cable (2), the soft joint (9), the viscosity reducer feeding pipe (14) and the inner walls of the oil exploitation wells (1) with different depths.
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