Heavy oil reservoir exploitation device and exploitation heating method thereof

Abstract

The invention relates to a heavy oil reservoir exploitation device and an exploitation heating method thereof. The device comprises an exploitation pipe column; the well mouth structure comprises a well mouth casing pipe, and an underground ejector is arranged in the well mouth casing pipe in a sleeved mode. The intelligent combined type steam generator comprises a plurality of steam generator single bodies arranged on the ground in parallel, the first end of each steam generator single body can be connected with an inlet manifold through a first isolation module, and a steam dryness measuring module is arranged between the first end of each steam generator single body and the first isolation module. The first isolation module can be further connected with an underground ejector in a sealed mode through a bypass pipeline, the second end of each steam generator single body can be connected with an outlet manifold through a second isolation module, and a steam dryness measuring module is arranged between the second end of each steam generator single body and the second isolation module. And a control unit. The purposes that the electric steam generator provides a large amount of clean steam and exploits underground crude oil are achieved, carbon emission is greatly reduced while efficient development is achieved, and the steam injection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, and in particular to ground equipment used for heavy oil reservoir production in an oil field, and in particular to a heavy oil reservoir production device and a production heating method thereof. Background Art

[0002] Due to its high underground viscosity, heavy oil is usually developed by injecting high-temperature steam; the main development technologies include steam throughput, steam drive, steam-assisted gravity drainage, etc. At present, high-temperature steam is usually generated by coal-fired or gas-fired steam boilers, which produces a large amount of CO2 greenhouse gas emissions. According to statistics, the current steam injection mining method corresponds to a carbon emission of 1.2tCO2 / t of heavy oil per ton of oil, and the carbon emission of boilers used for thermal recovery nationwide is as high as 20 million tons / year. It is necessary to change the way steam is generated and use clean energy to generate steam.

[0003] At the same time, downhole electric heating technology has been well applied in oil fields. It can effectively improve heat utilization and reduce heat loss on the ground and in the wellbore. However, the power of downhole electric heaters is small, and it is difficult to effectively heat the oil layer with high power and for a long time.

[0004] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a heavy oil reservoir production device and a production heating method thereof to overcome the defects of the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a heavy oil reservoir exploitation device and an exploitation heating method thereof, which adopts modular steam generator monomers arranged in parallel on the ground to form a powerful electric heater, which can meet the technical requirements of high-dryness and large-displacement steam injection, and overcome the problem that the current electric boiler power cannot meet the steam injection. The present invention realizes the purpose of the electric steam generator providing a large amount of clean steam to exploit underground crude oil, and while developing efficiently, it greatly reduces carbon emissions and improves the efficiency of steam injection.

[0006] The object of the present invention is achieved by providing a heavy oil reservoir production device, comprising:

[0007] Production pipe string;

[0008] The wellhead structure comprises a wellhead casing arranged concentrically with the production pipe string, and downhole injectors are arranged concentrically and radially spaced in the wellhead casing;

[0009] An intelligent combined steam generator comprises a plurality of steam generator monomers arranged in parallel on the ground, wherein the first end of each steam generator monomer can be connected to an inlet manifold through a first isolation module, a steam dryness measurement module is respectively arranged between the first end of each steam generator monomer and the first isolation module, the first isolation module can also be sealed and connected to a downhole ejector through a bypass pipeline, the first isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the inlet manifold or the bypass pipeline; the second end of each steam generator monomer can be connected to an outlet manifold through a second isolation module, a steam dryness measurement module is respectively arranged between the second end of each steam generator monomer and the second isolation module, the second isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the outlet manifold; the outlet manifold can be sealed and connected to the downhole ejector;

[0010] A control unit, the steam generator unit, the steam quality measurement module, the first isolation module, and the second isolation module are all electrically connected to the control unit.

[0011] In a preferred embodiment of the present invention, the top end of the downhole injector is connected to a docking structure, and a multi-stage series-connected blowout preventer is arranged at the docking structure.

[0012] In a preferred embodiment of the present invention, the first isolation module includes an isolation solenoid valve for isolating the first ends of two adjacent steam generator units, and the first isolation module also includes an inlet solenoid valve capable of controlling the connection state between each steam generator unit and the inlet manifold, and each isolation solenoid valve and each inlet solenoid valve is equipped with a PID control module, and each of the isolation solenoid valves and each of the inlet solenoid valves are electrically connected to the control unit.

[0013] In a preferred embodiment of the present invention, the second isolation module includes an isolation solenoid valve for isolating the second ends of two adjacent steam generator units, and the second isolation module also includes an outlet solenoid valve capable of controlling the connection state between each steam generator unit and the outlet manifold, and each isolation solenoid valve and each outlet solenoid valve are equipped with a PID control module, and each of the isolation solenoid valves and each of the outlet solenoid valves are electrically connected to the control unit.

[0014] In a preferred embodiment of the present invention, each of the steam generator units is an electric steam boiler unit, and each of the steam generator units includes an electromagnetic heating coil and a high-pressure furnace body.

[0015] In a preferred embodiment of the present invention, each of the steam generator units is connected to the first isolation module and the second isolation module via a circulating hot fluid pipeline.

[0016] In a preferred embodiment of the present invention, a roller is disposed at the bottom of each steam generator unit.

[0017] In a preferred embodiment of the present invention, the outer side of the intelligent combined steam generator is covered with a radiation shielding cover.

[0018] In a preferred embodiment of the present invention, the wellhead structure further includes a temperature and pressure gauge, and the temperature and pressure gauge is electrically connected to the control unit.

[0019] In a preferred embodiment of the present invention, the downhole injector extends from the wellhead to the middle of the oil layer at the bottom of the well.

[0020] In a preferred embodiment of the present invention, the number of the blowout preventers is 4-8.

[0021] The object of the present invention can also be achieved in this way. A production heating method for the aforementioned heavy oil reservoir production device determines the number of steam generator units to be heated according to the flow rate of steam injection required; the control unit uses a PID control module to remotely control the opening of the inlet solenoid valves of the required number of steam generator units; water is injected into the steam generator units according to a predetermined flow rate and then heating is started, the outlet steam dryness of the steam generator units is measured, the isolation module of the steam generator units is controlled according to the steam injection speed, the connection state between the steam generator units and the connection state between the steam generator units and the downhole injector are adjusted, the outlet steam dryness of the steam generator units is greater than or equal to 80% and above, and the steam is injected from the wellhead structure into the downhole production string.

[0022] In a preferred embodiment of the present invention, the intelligent combined steam generator comprises a first steam generator monomer, a second steam generator monomer, a third steam generator monomer and a fourth steam generator monomer which are arranged in parallel;

[0023] When the steam injection rate is lower than 50t / d, a heating mode is adopted in which one steam generator unit is turned on; the inlet solenoid valve of the first steam generator is turned on, water is injected into the first steam generator unit at a predetermined flow rate, and then the first inlet solenoid valve of the first steam generator is closed to start heating; the outlet steam dryness of the second end of the first steam generator unit is less than 30%, and the isolation solenoid valve between the second ends of the first steam generator unit and the second steam generator unit is turned on, and the fluid of the first steam generator unit flows to the second steam generator unit to enter secondary heating; the outlet steam dryness of the first end of the second ... outlet steam dryness of the second end of the second steam generator unit is less than 30%. When the dryness of the outlet steam of the second end of the third steam generator unit is less than 80%, the isolation solenoid valve between the second end of the third steam generator unit and the fourth steam generator unit is opened, and the fluid of the third steam generator unit flows to the fourth steam generator unit and enters the fourth heating; when the dryness of the outlet steam of the fourth steam generator unit is greater than or equal to 80%, the steam is injected into the production string underground from the wellhead structure.

[0024] In a preferred embodiment of the present invention, the intelligent combined steam generator comprises a first steam generator monomer, a second steam generator monomer, a third steam generator monomer and a fourth steam generator monomer which are arranged in parallel;

[0025] When the steam injection rate is 50t / d to 100t / d, a heating mode is adopted in which two steam generator monomers are simultaneously turned on; the inlet solenoid valves of the first steam generator monomer and the second steam generator monomer are simultaneously turned on, and the isolation solenoid valve between the second ends of the first steam generator monomer and the second steam generator monomer is turned on;

[0026] The outlet steam dryness of the second end of the first steam generator monomer and the second steam generator monomer is less than 30%, the isolation solenoid valve between the second end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the second end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the first steam generator monomer and the second steam generator monomer flows to the third steam generator monomer and the fourth steam generator monomer to enter the secondary heating;

[0027] The outlet steam dryness of the first end of the third steam generator monomer and the fourth steam generator monomer is less than 60%, the isolation solenoid valve between the first end of the first steam generator monomer and the second steam generator monomer, the isolation solenoid valve between the first end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the first end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the third steam generator monomer and the fourth steam generator monomer flows to the first steam generator monomer and the second steam generator monomer, and enters the third heating;

[0028] The outlet steam dryness of the first steam generator monomer and the second steam generator monomer is less than 80%, the isolation solenoid valve between the second end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the second end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the first steam generator monomer and the second steam generator monomer flows to the third steam generator monomer and the fourth steam generator monomer, and enters the fourth heating;

[0029] After the outlet steam dryness of the steam generator unit is greater than or equal to 80%, the steam is injected into the production string underground from the wellhead structure.

[0030] As described above, the heavy oil reservoir production device and the production heating method thereof of the present invention have the following beneficial effects:

[0031] The present invention adopts modular steam generator monomers arranged in parallel on the ground to form a powerful electric heater, which can meet the technical requirements of high dryness and large displacement steam injection, and overcome the problem that the power of current electric boilers cannot meet the steam injection requirements;

[0032] The control unit controls the isolation module of the steam generator unit through the PID control module according to the outlet steam dryness detected by the steam dryness measurement module, so as to control the opening and closing of each steam generator unit and the number of cycle heating at different flow rates;

[0033] The present invention realizes the purpose of providing a large amount of clean steam by an electric steam generator to exploit underground crude oil, greatly reduces carbon emissions and improves the efficiency of steam injection while developing efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0035] in:

[0036] Figure 1 : is a schematic diagram of a heavy oil reservoir production device of the present invention.

[0037] Figure 2 : is a schematic diagram of the first isolation module of the present invention.

[0038] Figure 3 : is a schematic diagram of the second isolation module of the present invention.

[0039] Figure 4 : It is a schematic diagram of the fluid flow of the intelligent combined steam generator according to the first embodiment of the present invention.

[0040] Figure 5 : A schematic diagram of fluid inflow and outflow of the intelligent combined steam generator according to the second embodiment of the present invention.

[0041] In the figure:

[0042] 1. Intelligent combined steam generator;

[0043] 11. a first steam generator monomer; 12. a second steam generator monomer; 13. a third steam generator monomer; 14. a fourth steam generator monomer;

[0044] 2. Wellhead structure; 21. Wellhead casing; 22. Downhole ejector; 23. Docking structure; 24. BOP;

[0045] 3. Inlet manifold;

[0046] 4. Export manifold;

[0047] 5. Radiation shielding cover;

[0048] 611, first inlet solenoid valve; 612, second inlet solenoid valve; 613, third inlet solenoid valve; 614, fourth inlet solenoid valve;

[0049] 621, fourth isolation solenoid valve; 622, fifth isolation solenoid valve; 623, sixth isolation solenoid valve;

[0050] 711, first isolation solenoid valve; 712, second isolation solenoid valve; 713, third isolation solenoid valve;

[0051] 721, first outlet solenoid valve; 722, second outlet solenoid valve; 723, third outlet solenoid valve; 724, fourth outlet solenoid valve;

[0052] 81. A first steam dryness measurement module; 82. A second steam dryness measurement module; 83. A third steam dryness measurement module; 84. A fourth steam dryness measurement module; 85. A fifth steam dryness measurement module; 86. A sixth steam dryness measurement module; 87. A seventh steam dryness measurement module; 88. An eighth steam dryness measurement module. DETAILED DESCRIPTION

[0053] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0054] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0056] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a heavy oil reservoir production device, comprising:

[0057] Production pipe string;

[0058] The wellhead structure 2 includes a wellhead casing 21 arranged concentrically with the production pipe string, and downhole injectors 22 are arranged concentrically and radially spaced inside the wellhead casing 21;

[0059] The intelligent combined steam generator 1 comprises a plurality of steam generator monomers arranged in parallel on the ground, the first end of each steam generator monomer can be connected to the inlet manifold 3 through the first isolation module, a steam dryness measuring module is respectively arranged between the first end of each steam generator monomer and the first isolation module, each steam dryness measuring module is used to measure the outlet steam dryness of the steam generator monomer, the first isolation module can also be sealed and connected to the downhole injector 22 through a bypass pipeline, the first isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the inlet manifold 3 or the bypass pipeline; the second end of each steam generator monomer can be connected to the outlet manifold 4 through the second isolation module, a steam dryness measuring module is respectively arranged between the second end of each steam generator monomer and the second isolation module, the second isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the outlet manifold 4; the outlet manifold can be sealed and connected to the downhole injector 22; the isolation modules at both ends of each steam generator monomer cooperate to complete the connection requirements of multiple steam generator monomers.

[0060] The control unit, each steam generator unit, the first isolation module, the steam quality measurement module, and the second isolation module are all electrically connected to the control unit.

[0061] The present invention provides a heavy oil reservoir exploitation device, which adopts modular steam generator monomers arranged in parallel on the ground to form a powerful electric heater, which can meet the technical requirements of high dryness and large displacement steam injection, and overcome the problem that the power of current electric boilers cannot meet the steam injection requirements;

[0062] The control unit controls the isolation module of the steam generator unit through the PID control module according to the outlet steam dryness detected by the steam dryness measurement module, so as to control the opening and closing of each steam generator unit and the number of cycle heating at different flow rates;

[0063] The present invention realizes the purpose of providing a large amount of clean steam by an electric steam generator to exploit underground crude oil, greatly reduces carbon emissions and improves the efficiency of steam injection while developing efficiently.

[0064] Further, if Figure 1 As shown, the top of the downhole injector 22 is connected to the docking interface structure 23, and a multi-stage series blowout preventer 24 is arranged at the docking interface structure 23, and the number of blowout preventers is 4-8. The multi-stage series blowout preventer is used at the wellhead to prevent leakage, which can meet the sealing requirements of different temperatures and pressures and achieve the purpose of quick connection and injection.

[0065] Further, if Figure 2As shown, the first isolation module includes an isolation solenoid valve for isolating the first ends of two adjacent steam generator units, and the first isolation module also includes an inlet solenoid valve capable of controlling the connection state between each steam generator unit and the inlet manifold 3. Each isolation solenoid valve and each inlet solenoid valve is equipped with a PID control module, and each isolation solenoid valve and each inlet solenoid valve are electrically connected to the control unit.

[0066] Further, if Figure 3 As shown, the second isolation module includes an isolation solenoid valve for isolating the second ends of two adjacent steam generator units, and the second isolation module also includes an outlet solenoid valve capable of controlling the connection state between each steam generator unit and the outlet manifold 4. Each isolation solenoid valve and each outlet solenoid valve is equipped with a PID control module, and each isolation solenoid valve and each outlet solenoid valve are electrically connected to the control unit.

[0067] Furthermore, each steam generator unit is an electric steam boiler unit, and each steam generator unit includes an electromagnetic heating coil and a high-pressure furnace body.

[0068] Furthermore, each steam generator monomer is connected to the first isolation module and the second isolation module through a circulating hot fluid pipeline.

[0069] Furthermore, rollers are arranged at the bottom of each steam generator unit, so that the units can be moved individually and quickly connected in parallel.

[0070] Furthermore, an outer cover of the intelligent combined steam generator 1 is provided with a radiation shielding cover 5 .

[0071] Furthermore, the wellhead structure also includes a temperature and pressure gauge and a high-temperature and high-pressure valve, and the temperature and pressure gauge is electrically connected to the control unit.

[0072] Furthermore, the downhole injector 22 extends from the wellhead to the middle of the bottom oil layer. The annulus between the downhole injector 22 and the wellhead casing 21 is calculated and pre-filled with heat-insulating nitrogen according to the buried depth of the oil layer and the annulus size; during the injection of high-pressure steam, the nitrogen increment is calculated according to the dynamic compression coefficient of nitrogen at different temperatures and pressures to achieve dynamic balance.

[0073] The present invention provides a production heating method for a heavy oil reservoir production device. The method comprises the following steps: determining the number of steam generator units to be heated according to the flow rate of steam injection as required; a control unit remotely controls the opening of inlet solenoid valves of the required number of steam generator units by using a PID control module; heating is started after water is injected into the steam generator units according to a predetermined flow rate, measuring the outlet steam dryness of the steam generator units, controlling the isolation modules of the steam generator units according to the steam injection speed, adjusting the connection state between the steam generator units and the connection state between the steam generator units and a downhole ejector 22, the outlet steam dryness of the steam generator units being greater than or equal to 80% and above, and the steam being injected from a wellhead structure into a downhole production string.

[0074] Embodiment 1

[0075] like Figure 1 As shown, the intelligent combined steam generator 1 includes four steam generator monomers arranged in parallel on the ground, namely a first steam generator monomer 11, a second steam generator monomer 12, a third steam generator monomer 13 and a fourth steam generator monomer 14.

[0076] like Figure 2 As shown, the first end (inlet) of the first steam generator monomer 11 is connected to the inlet manifold 3 through the first inlet solenoid valve 611 equipped with a PID control module, the first end of the second steam generator monomer 12 is connected to the inlet manifold 3 through the second inlet solenoid valve 612 equipped with a PID control module, the first end of the third steam generator monomer 13 is connected to the inlet manifold 3 through the third inlet solenoid valve 613 equipped with a PID control module, and the first end of the fourth steam generator monomer 14 is connected to the inlet manifold 3 through the fourth inlet solenoid valve 614 equipped with a PID control module. Each inlet solenoid valve is used to control the circulation heating of steam.

[0077] like Figure 2 , Figure 3 As shown, a fifth steam dryness measurement module 85 is provided at the first end (inlet) of the first steam generator monomer 11, a sixth steam dryness measurement module 86 is provided at the first end of the second steam generator monomer 12, a seventh steam dryness measurement module 87 is provided at the first end of the third steam generator monomer 13, and an eighth steam dryness measurement module 88 is provided at the first end of the fourth steam generator monomer 14; a first steam dryness measurement module 81 is provided at the second end (outlet) of the first steam generator monomer 11, a second steam dryness measurement module 82 is provided at the second end of the second steam generator monomer 12, a third steam dryness measurement module 83 is provided at the second end of the third steam generator monomer 13, and a fourth steam dryness measurement module 84 is provided at the second end of the fourth steam generator monomer 14. The steam dryness measurement module is used to measure the outlet fluid dryness (outlet steam dryness) of the steam generator monomer; the outlet steam dryness is back-calculated by a vortex step flowmeter, and the equivalent dryness is determined according to the ratio of the inlet flow rate to the outlet flow rate.

[0078] like Figure 2 , Figure 3As shown, a fourth isolation solenoid valve 621 is provided between the first ends of the first steam generator monomer 11 and the second steam generator monomer 12, a fifth isolation solenoid valve 622 is provided between the first ends of the second steam generator monomer 12 and the third steam generator monomer 13, and a sixth isolation solenoid valve 623 is provided between the first ends of the third steam generator monomer 13 and the fourth steam generator monomer 14; a first isolation solenoid valve 711 is provided between the second ends of the first steam generator monomer 11 and the second steam generator monomer 12, a second isolation solenoid valve 712 is provided between the second ends of the second steam generator monomer 12 and the third steam generator monomer 13, and a third isolation solenoid valve 713 is provided between the second ends of the third steam generator monomer 13 and the fourth steam generator monomer 14. Adjacent steam generator monomers are connected by isolation solenoid valves, and the pipelines between the steam generator monomers can be flexibly opened and closed.

[0079] A first outlet solenoid valve 721 is provided between the second end (outlet) of the first steam generator monomer 11 and the outlet manifold 4, a second outlet solenoid valve 722 is provided between the second end of the second steam generator monomer 12 and the outlet manifold 4, a third outlet solenoid valve 723 is provided between the second end of the third steam generator monomer 13 and the outlet manifold 4, and a fourth outlet solenoid valve 724 is provided between the second end of the fourth steam generator monomer 14 and the outlet manifold 4. Each outlet solenoid valve is used to open or close the connection between each steam generator monomer and the steam injection pipeline.

[0080] Each solenoid valve (first inlet solenoid valve 611, second inlet solenoid valve 612, third inlet solenoid valve 613, fourth inlet solenoid valve 614, first isolation solenoid valve 711, second isolation solenoid valve 712, third isolation solenoid valve 713, fourth isolation solenoid valve 621, fifth isolation solenoid valve 622, sixth isolation solenoid valve 623, first outlet solenoid valve 721, second outlet solenoid valve 722, third outlet solenoid valve 723, fourth outlet solenoid valve 724) is equipped with a PID control module, which is used in conjunction with the solenoid valve for intelligently opening and closing the solenoid valve.

[0081] The docking structure 23 is a quick interface, and a blowout preventer is arranged on the upper part. The number of the blowout preventers is determined according to the injection pressure and temperature. In this embodiment, the injection pressure is 5 MPa, and the number of the blowout preventers is 4.

[0082] This embodiment provides a production heating method for a heavy oil reservoir production device, comprising the following steps:

[0083] First, the number of steam generator units for primary heating is determined according to the required steam injection flow rate. When the steam injection rate is lower than 50 t / d, a heating mode with one steam generator unit turned on is adopted. In this embodiment, the steam injection rate is set to 45 t / d.

[0084] Using the PID control module, through remote software, the inlet solenoid valve (the first inlet solenoid valve 611) of the first steam generator unit is controlled to open, and the other solenoid valves are closed;

[0085] After water is injected into the high-pressure furnace body of the first steam generator unit at a predetermined flow rate, the inlet solenoid valve of the steam generator unit is closed and high-power heating is started. The steam dryness is measured from the outlet of the first steam generator unit and the solenoid valves of each isolation module are controlled in accordance with the following principles. The flow of the fluid is as follows: Figure 4 As shown:

[0086] The outlet steam dryness of the second end of the first steam generator monomer 11 is less than 30%: the first isolation solenoid valve 711 between the second ends of the first steam generator monomer 11 and the second steam generator monomer 12 is opened, and the fluid of the first steam generator monomer 11 flows to the second steam generator monomer 12 through the first isolation solenoid valve 711 and enters the secondary heating;

[0087] The outlet steam dryness of the first end of the second steam generator monomer 12 is less than 60%: the fifth isolation solenoid valve 622 between the second steam generator monomer 12 and the first end of the third steam generator monomer 13 is opened, and the fluid of the second steam generator monomer 12 flows to the third steam generator monomer 13 through the fifth isolation solenoid valve 622 and enters the third heating;

[0088] The outlet steam dryness of the second end of the third steam generator monomer 13 is less than 80%: the third isolation solenoid valve 713 between the second ends of the third steam generator monomer 13 and the fourth steam generator monomer 14 is opened, and the fluid of the third steam generator monomer 13 flows to the fourth steam generator monomer 14 through the third isolation solenoid valve 713 and enters the fourth heating;

[0089] After the outlet steam quality of the fourth steam generator unit 14 is greater than or equal to 80% (in this embodiment, the outlet steam quality of the fourth steam generator unit 14 reaches 90%), steam is injected from the wellhead structure into the production string underground.

[0090] If the outlet steam dryness of the fourth steam generator unit 14 is less than 80%, it is necessary to adjust the steam injection rate or increase the number of steam generator units to meet the mining demand.

[0091] Embodiment 2

[0092] In this embodiment, the docking structure 23 is a quick interface, and a blowout preventer is arranged on the upper part. The number of the blowout preventers is determined according to the injection pressure and temperature. In this embodiment, the injection pressure is 10 MPa, and the number of the blowout preventers is 8.

[0093] The other structural settings are the same as those in the first embodiment and will not be described in detail here.

[0094] This embodiment provides a production heating method for a heavy oil reservoir production device, comprising the following steps:

[0095] First, the number of steam generator units for primary heating is determined according to the required steam injection flow rate. When the steam injection rate is lower than 50t / d to 100t / d, a heating mode in which two steam generator units are simultaneously turned on is adopted. In this embodiment, the steam injection rate is set to 100t / d.

[0096] Using the PID control module, through remote software, the inlet solenoid valves of two steam generator monomers (the first steam generator monomer 11 and the second steam generator monomer 12) are controlled to open, and the remaining solenoid valves are closed;

[0097] Inject water into the high-pressure furnace of the steam generator unit at a predetermined flow rate, close the inlet solenoid valves of the two steam generator units and start high-power heating, measure the steam dryness from the outlet of the steam generator unit, and control the switch of the solenoid valve of each isolation module according to the following principles. The flow of the fluid is as follows: Figure 5 As shown:

[0098] Simultaneously opening the first inlet solenoid valve 611 and the second inlet solenoid valve 612 of the first ends of the first steam generator monomer 11 and the second steam generator monomer 12, and opening the first isolation solenoid valve 711 between the second ends of the first steam generator monomer 11 and the second steam generator monomer 12;

[0099] The outlet steam dryness of the second ends of the first steam generator monomer 11 and the second steam generator monomer 12 is less than 30%, the second isolation solenoid valve 712 provided between the second ends of the second steam generator monomer 12 and the third steam generator monomer 13, and the third isolation solenoid valve 713 provided between the second ends of the third steam generator monomer 13 and the fourth steam generator monomer 14 are opened, and the fluid of the first steam generator monomer 11 and the second steam generator monomer 12 flows to the third steam generator monomer 13 and the fourth steam generator monomer 14 through the second isolation solenoid valve 712 and the third isolation solenoid valve 713, and enters the secondary heating;

[0100] The outlet steam dryness of the first end of the third steam generator monomer 13 and the fourth steam generator monomer 14 is less than 60%, the fourth isolation solenoid valve 621, the fifth isolation solenoid valve 622, and the sixth isolation solenoid valve 623 at the first end are opened, and the fluid of the third steam generator monomer 13 and the fourth steam generator monomer 14 flows to the first steam generator monomer 11 and the second steam generator monomer 12, and enters the third heating;

[0101] The outlet steam quality of the second ends of the first steam generator monomer 11 and the second steam generator monomer 12 is less than 80%, a second isolation solenoid valve 712 is provided between the second ends of the second steam generator monomer 12 and the third steam generator monomer 13, and a third isolation solenoid valve 713 is provided between the second ends of the third steam generator monomer 13 and the fourth steam generator monomer 14, and the fluid of the first steam generator monomer 11 and the second steam generator monomer 12 flows to the third steam generator monomer 13 and the fourth steam generator monomer 14 through the second isolation solenoid valve 712 and the third isolation solenoid valve 713, and enters the fourth heating;

[0102] After the outlet steam quality of the steam generator unit is greater than or equal to 80% (in this embodiment, the outlet steam quality of the steam generator unit reaches 95%), steam is injected from the wellhead structure into the production string downhole.

[0103] This method adopts a two-by-two combination, reciprocating cycle heating mode, which can achieve multiple heating and greatly improve the steam dryness.

[0104] The heavy oil reservoir exploitation device and the exploitation heating method provided by the present invention are modularized in the serial combination of steam generator monomers (boilers), and the number of cyclic heating times according to the dryness is intelligent. Among them, modular parallel steam generator monomers (boilers) are used to form a powerful electric heater, which can meet the technical requirements of high dryness and large displacement steam injection, and overcome the problem that the current electric boiler power cannot meet the steam injection; a program-controlled PID module is used, and then the solenoid valve is further controlled to control the opening and closing of each steam generator monomer (boiler), as well as the number of cyclic heating times at different flow rates. Under the condition of low-speed injection, a single or two boilers can be used, and in the case of high-speed injection, multiple boilers can be used, or repeated cyclic heating can be used to solve the dryness problem of different injection speeds. The use of a multi-stage blowout preventer in series at the wellhead to prevent leakage can meet the sealing requirements of different temperatures and pressures, and achieve the purpose of rapid connection and injection.

[0105] As described above, the heavy oil reservoir production device and the production heating method thereof of the present invention have the following beneficial effects:

[0106] The present invention adopts modular steam generator monomers arranged in parallel on the ground to form a powerful electric heater, which can meet the technical requirements of high dryness and large displacement steam injection, and overcome the problem that the power of current electric boilers cannot meet the steam injection requirements;

[0107] The control unit controls the solenoid valve of the steam generator unit through the PID control module according to the outlet steam dryness detected by the steam dryness measurement module to control the opening and closing of each steam generator unit and the number of cycle heating at different flow rates;

[0108] The present invention realizes the purpose of providing a large amount of clean steam by an electric steam generator to exploit underground crude oil, greatly reduces carbon emissions and improves the efficiency of steam injection while developing efficiently.

[0109] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A heavy oil reservoir production device, characterized in that: include, Production pipe string; The wellhead structure comprises a wellhead casing arranged concentrically with the production pipe string, and downhole injectors are arranged concentrically and radially spaced in the wellhead casing; An intelligent combined steam generator comprises a plurality of steam generator monomers arranged in parallel on the ground, wherein the first end of each steam generator monomer can be connected to an inlet manifold through a first isolation module, a steam dryness measurement module is respectively arranged between the first end of each steam generator monomer and the first isolation module, the first isolation module can also be sealed and connected to a downhole ejector through a bypass pipeline, the first isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the inlet manifold or the bypass pipeline; the second end of each steam generator monomer can be connected to an outlet manifold through a second isolation module, a steam dryness measurement module is respectively arranged between the second end of each steam generator monomer and the second isolation module, the second isolation module is used to control the connection state between each steam generator monomer and the connection state between each steam generator monomer and the outlet manifold; the outlet manifold can be sealed and connected to the downhole ejector; A control unit, the steam generator unit, the steam quality measurement module, the first isolation module, and the second isolation module are all electrically connected to the control unit.

2. The heavy oil reservoir production device according to claim 1, characterized in that: The top end of the downhole ejector is connected to a docking structure, and a multi-stage series-connected blowout preventer is arranged at the docking structure.

3. The heavy oil reservoir production device according to claim 1, characterized in that: The first isolation module includes an isolation solenoid valve for isolating the first ends of two adjacent steam generator units. The first isolation module also includes an inlet solenoid valve that can control the connection status between each steam generator unit and the inlet manifold. Each isolation solenoid valve and each inlet solenoid valve is equipped with a PID control module, and each of the isolation solenoid valves and each of the inlet solenoid valves are electrically connected to the control unit.

4. The heavy oil reservoir production device according to claim 3, characterized in that: The second isolation module includes an isolation solenoid valve for isolating the second ends of two adjacent steam generator units. The second isolation module also includes an outlet solenoid valve that can control the connection status of each steam generator unit with the outlet manifold. Each isolation solenoid valve and each outlet solenoid valve is equipped with a PID control module, and each of the isolation solenoid valves and each of the outlet solenoid valves are electrically connected to the control unit.

5. The heavy oil reservoir production device according to claim 4, characterized in that: Each of the steam generator units is an electric steam boiler unit, and each of the steam generator units includes an electromagnetic heating coil and a high-pressure furnace body.

6. The heavy oil reservoir production device according to claim 5, characterized in that: Each of the steam generator units is connected to the first isolation module and the second isolation module through a circulating hot fluid pipeline.

7. The heavy oil reservoir production device according to claim 1, characterized in that: A roller is arranged at the bottom of each steam generator unit.

8. The heavy oil reservoir production device according to claim 1, characterized in that: The outer side cover of the intelligent combined steam generator is provided with a radiation shielding cover.

9. The heavy oil reservoir production device according to claim 1, characterized in that: The wellhead structure further includes a temperature and pressure gauge, and the temperature and pressure gauge is electrically connected to the control unit.

10. The heavy oil reservoir production device according to claim 1, characterized in that: The downhole injector extends from the wellhead to the middle of the oil layer at the bottom of the well.

11. The heavy oil reservoir production device according to claim 2, characterized in that: The number of the blowout preventers is 4-8.

12. A mining heating method for a heavy oil reservoir mining device according to any one of claims 1 to 11, characterized in that: The number of steam generator units to be heated is determined according to the flow rate of steam injection as required; the control unit uses the PID control module to remotely control the opening of the inlet solenoid valves of the required number of steam generator units; water is injected into the steam generator units at a predetermined flow rate to start heating, the outlet steam dryness of the steam generator units is measured, the isolation module of the steam generator units is controlled according to the steam injection speed, the connection status between the steam generator units and the connection status between the steam generator units and the downhole injector are adjusted, the outlet steam dryness of the steam generator units is greater than or equal to 80% and above, and the steam is injected from the wellhead structure into the downhole production pipe.

13. The mining heating method for a heavy oil reservoir mining device according to claim 12, characterized in that: The intelligent combined steam generator comprises a first steam generator monomer, a second steam generator monomer, a third steam generator monomer and a fourth steam generator monomer which are arranged in parallel; When the steam injection rate is lower than 50t / d, a heating mode is adopted in which one steam generator unit is turned on; the inlet solenoid valve of the first steam generator is turned on, water is injected into the first steam generator unit at a predetermined flow rate, and then the first inlet solenoid valve of the first steam generator is closed to start heating; the outlet steam dryness of the second end of the first steam generator unit is less than 30%, and the isolation solenoid valve between the second ends of the first steam generator unit and the second steam generator unit is turned on, and the fluid of the first steam generator unit flows to the second steam generator unit to enter secondary heating; the outlet steam dryness of the first end of the second ... outlet steam dryness of the second end of the second steam generator unit is less than 30%. When the dryness of the outlet steam of the second end of the third steam generator unit is less than 80%, the isolation solenoid valve between the second end of the third steam generator unit and the fourth steam generator unit is opened, and the fluid of the third steam generator unit flows to the fourth steam generator unit and enters the fourth heating; when the dryness of the outlet steam of the fourth steam generator unit is greater than or equal to 80%, the steam is injected into the production string underground from the wellhead structure.

14. The mining heating method for a heavy oil reservoir mining device according to claim 12, characterized in that: The intelligent combined steam generator comprises a first steam generator monomer, a second steam generator monomer, a third steam generator monomer and a fourth steam generator monomer which are arranged in parallel; When the steam injection rate is 50t / d to 100t / d, a heating mode is adopted in which two steam generator monomers are simultaneously turned on; the inlet solenoid valves of the first steam generator monomer and the second steam generator monomer are simultaneously turned on, and the isolation solenoid valve between the second ends of the first steam generator monomer and the second steam generator monomer is turned on; The outlet steam dryness of the second end of the first steam generator monomer and the second steam generator monomer is less than 30%, the isolation solenoid valve between the second end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the second end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the first steam generator monomer and the second steam generator monomer flows to the third steam generator monomer and the fourth steam generator monomer to enter the secondary heating; The outlet steam dryness of the first end of the third steam generator monomer and the fourth steam generator monomer is less than 60%, the isolation solenoid valve between the first end of the first steam generator monomer and the second steam generator monomer, the isolation solenoid valve between the first end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the first end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the third steam generator monomer and the fourth steam generator monomer flows to the first steam generator monomer and the second steam generator monomer, and enters the third heating; The outlet steam dryness of the first steam generator monomer and the second steam generator monomer is less than 80%, the isolation solenoid valve between the second end of the second steam generator monomer and the third steam generator monomer, and the isolation solenoid valve between the second end of the third steam generator monomer and the fourth steam generator monomer are opened, and the fluid of the first steam generator monomer and the second steam generator monomer flows to the third steam generator monomer and the fourth steam generator monomer, and enters the fourth heating; After the outlet steam dryness of the steam generator unit is greater than or equal to 80%, the steam is injected into the production string underground from the wellhead structure.

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