Super heavy oil recovery system

Abstract

The invention discloses a super-heavy oil exploitation system, and belongs to the technical field of oil and gas exploitation. The system comprises a production device, a heating device, a liquid injection device and a separation and storage device, the production device is arranged in a well mouth of a well to be logged and comprises an oil pipe and a hydraulic pump, and the hydraulic pump is arranged on the oil pipe. The heating device is arranged on a liquid outlet pipeline of the to-be-measured well and communicates with an oil sleeve annulus of the to-be-measured well and the separation and storage device. The liquid injection device is arranged on a liquid inlet pipeline of the well to be measured and communicates with the oil pipe and the separation and storage device. Power liquid is contained in the separation and storage device. The system can reduce production energy consumption and realize low-cost development of super-heavy oil.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas production, and in particular to an extra-heavy oil production system. Background Art

[0002] As conventional oil reserves continue to decrease, the existing conventional oil production can no longer meet the demand, so the development of some unconventional oil resources has gradually received attention, among which the exploitation and development of extra-heavy oil is very important.

[0003] In the relevant technologies, the extraction of extra-heavy oil is mainly carried out through steam injection thermal recovery, burning oil layers, hot water plus chemical huff and puff, etc. However, these extraction methods have high investment, low efficiency and great difficulty, and are particularly unsuitable for the development of extra-heavy oil small block reservoirs. Summary of the invention

[0004] In view of this, the present application provides an extra-heavy oil production system, which replaces high-energy consumption methods such as steam injection thermal recovery, oil layer burning, hot water plus chemical throughput in related technologies, reduces production energy consumption, and realizes low-cost development of extra-heavy oil.

[0005] Specifically, the following technical solutions are included:

[0006] The embodiment of the present application provides an ultra-heavy oil production system, characterized in that the system comprises: a production device, a heating device, a liquid injection device and a separation storage device;

[0007] The production device is arranged in the wellhead of the well to be tested, and the production device comprises an oil pipe and a hydraulic pump, and the hydraulic pump is arranged on the oil pipe;

[0008] The heating device is arranged on the liquid outlet pipeline of the well to be tested, and is connected to the casing annulus of the well to be tested and the separation storage device;

[0009] The liquid injection device is arranged on the liquid inlet pipeline of the well to be tested and is connected to both the oil pipe and the separation storage device;

[0010] The separate storage device contains power fluid.

[0011] In some embodiments, the hydraulic pump includes a pump barrel and a pump core;

[0012] The interior of the pump barrel is hollow and provided with a first liquid outlet, and the pump core is detachably arranged inside the pump barrel;

[0013] The pump core comprises a first part, a second part and a third part arranged in sequence from the first end to the second end of the pump barrel, the first part, the second part and the third part are all hollow inside, the first part is connected with the second part, and a barrier is arranged between the second part and the third part;

[0014] A first liquid inlet hole is disposed at one end of the first part close to the first end, a nozzle is disposed at one end of the first part away from the first end, and a sealing member is disposed on an outer wall of the first part;

[0015] A second liquid inlet hole is provided on a side of the second part facing the first part, the second liquid inlet hole is communicated with the interior of the pump barrel, and a second liquid outlet hole is provided on a side of the second part away from the first part, the second liquid outlet hole is communicated with the first liquid outlet hole, wherein the aperture of the second liquid outlet hole is smaller than the aperture of the first liquid outlet hole;

[0016] The third part is provided with a third liquid outlet hole, the third liquid outlet hole is communicated with the interior of the pump barrel, and the third part is provided with a third liquid inlet hole at one end close to the second end.

[0017] In some embodiments, the separation storage device includes a processing tank and a heating assembly;

[0018] The interior of the processing tank is hollow, and the heating assembly includes a heating part and a first display part. The heating part is arranged inside the processing tank, and the first display part is arranged outside the processing tank.

[0019] In some embodiments, the separation storage device further comprises a temperature sensor and a liquid level sensor;

[0020] The temperature sensor is arranged inside the processing tank;

[0021] The liquid level sensor includes a measuring portion and a second display portion, wherein the measuring portion is disposed inside the processing tank, and the second display portion is disposed outside the processing tank.

[0022] In some embodiments, the separation storage device further comprises a screw pump and an external transmission pipeline;

[0023] The upper part of the treatment tank is provided with a fourth liquid outlet, and the treatment tank is connected with the external transmission pipeline through the fourth liquid outlet;

[0024] The screw pump is arranged on the external transmission pipeline.

[0025] In some embodiments, the separation storage device further comprises a fluid replenishment line and a valve;

[0026] The liquid replenishment pipeline is arranged on one side of the treatment tank and communicates with the interior of the treatment tank;

[0027] The valve is arranged on the fluid infusion pipeline.

[0028] In some embodiments, the injection device includes a water injection pump and a dosing assembly;

[0029] One end of the dosing assembly is communicated with the lower part of the processing tank, and the other end is communicated with one end of the water injection pump, and the other end of the water injection pump is communicated with the oil pipe of the well to be tested.

[0030] In some embodiments, the dosing assembly includes a dosing pump, a dosing tank, and a dosing pipeline;

[0031] The dosing pipeline is communicated with the liquid inlet pipeline, and the dosing tank and the dosing pump are arranged on the dosing pipeline.

[0032] In some embodiments, the production device further comprises a screen and a plug;

[0033] The plug is disposed at an end of the oil pipe away from the wellhead and is configured to plug the oil pipe;

[0034] The screen pipe is arranged on the oil pipe and is located between the hydraulic pump and the plug.

[0035] In some embodiments, the system further comprises a control device;

[0036] The control device is signal-connected to the hydraulic pump, the heating device, the injection device and the separation storage device.

[0037] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0038] The super-heavy oil production system provided by the embodiment of the present application has power fluid contained inside the separation storage device. Therefore, when the system is in use, the power fluid in the separation storage device can flow into the oil pipe through the liquid inlet pipeline under the pumping action of the liquid injection device. After the power fluid is injected into the oil pipe, it is pumped into the formation through the hydraulic pump; under the lifting action of the hydraulic pump, the mixed liquid of the power fluid and the formation production fluid flows from the oil casing annulus into the liquid outlet pipeline; when passing through the heating device, the temperature of the heated oil-water mixed liquid increases, which can ensure the fluidity of the mixed liquid; when the mixed liquid enters the separation storage device, the oil and water are separated in the separation storage device, and the separated liquid is used as the power fluid again, and flows into the oil pipe through the liquid inlet pipeline under the pumping action of the liquid injection device, thereby realizing the recycling of the power fluid. The system uses a combination of hydraulic pump lifting, internal circulation of power fluid heating, and oil-water separation using a separation storage device to achieve the recovery of ultra-heavy oil, replacing high-energy consumption methods such as steam injection thermal recovery, oil layer burning, hot water plus chemical throughput in related technologies, reducing production energy consumption and achieving low-cost development of ultra-heavy oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A structural schematic diagram of an extra-heavy oil production system provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a hydraulic pump in an extra-heavy oil production system provided in an embodiment of the present application.

[0042] The reference numerals in the figures represent respectively:

[0043] 1-production device; 11-oil pipe; 12-hydraulic pump; 121-pump barrel; 1211-first liquid outlet; 1212-first end; 1213-second end; 122-pump core; 1221-first part; 12211-first liquid inlet; 12212-nozzle; 12213-sealing member; 1222-second part; 12221-second liquid inlet; 12222-second liquid outlet; 1223-third part; 12231-third liquid outlet; 12232-third liquid inlet; 1224-blocking member;

[0044] 2- Heating device;

[0045] 3-liquid injection device; 31-water injection pump; 32-dosing assembly; 321-dosing pump; 322-dosing tank; 323-dosing pipeline;

[0046] 4-separation storage device; 41-processing tank; 411-fourth liquid outlet, 42-heating assembly; 421-heating part, 422-first display part; 43-temperature sensor; 44-liquid level sensor; 441-measuring part, 442-second display part, 45-screw pump; 46-external transmission pipeline; 47-liquid replenishment pipeline; 48-valve;

[0047] 5-well to be tested; 51-liquid outlet pipeline; 52-liquid inlet pipeline;

[0048] 6- Control device.

[0049] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0052] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0053] In the embodiments of the present application, the “super heavy oil” referred to generally refers to petroleum with a viscosity greater than 50,000 (mPa·s).

[0054] The "oil casing annulus" involved generally refers to the space formed between the oil pipe and the casing.

[0055] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0056] With the continuous development of oil field resources, the reserves of conventional oil resources are constantly decreasing. The existing conventional oil resource output can no longer meet the demand. It is necessary to develop and utilize unconventional oil resources. Therefore, the development and utilization of heavy oil has received increasing attention. my country has abundant heavy oil resources, and the output of heavy oil accounts for a large proportion of the total oil output. Among the heavy oils, the extraction of extra-heavy oil is difficult and the reserves are abundant. Therefore, the extraction of extra-heavy oil is particularly critical.

[0057] In the relevant technologies, the extraction of extra-heavy oil is mainly carried out through steam injection thermal recovery, burning oil layers, hot water plus chemical huff and puff, etc. However, these extraction methods have high investment, low efficiency and great difficulty, and are particularly unsuitable for the development of extra-heavy oil small block reservoirs.

[0058] In order to solve the technical problems existing in the related technology, the embodiment of the present application provides an ultra-heavy oil production system, which replaces the high-energy consumption methods such as steam injection thermal recovery, oil layer burning, hot water plus chemical huff and puff in the related technology, reduces production energy consumption, and realizes the low-cost development of ultra-heavy oil.

[0059] Figure 1 This is a schematic diagram of the structure of an ultra-heavy oil recovery system provided in an embodiment of the present application. Figure 1 The super heavy oil production system includes: a production device 1, a heating device 2, a liquid injection device 3 and a separation storage device 4.

[0060] The production device 1 is arranged in the wellhead of the well to be measured 5, and comprises an oil pipe 11 and a hydraulic pump 12. The hydraulic pump 12 is arranged on the oil pipe 11. By connecting the hydraulic pump 12 to the oil pipe 11 and placing it in the well to be measured 5, it is convenient for the power fluid to enter the hydraulic pump 12 through the oil pipe 11, so as to realize the hydraulic lifting of the hydraulic pump 12, and guide the mixture containing super-heavy oil into the casing annulus.

[0061] The heating device 2 is arranged on the liquid outlet pipeline 51 of the well to be measured 5, and is connected with the casing annulus and the separation storage device 4 of the well to be measured 5. Due to the hydraulic lifting action of the hydraulic pump 12, the mixture is led out into the casing annulus, and then can enter the liquid outlet pipeline 51 through the casing annulus. In view of the high freezing point of super-heavy oil, it is easy to solidify at room temperature. Therefore, by arranging the heating device 2 on the liquid outlet pipeline 51, the mixed liquid containing super-heavy oil can be heated to prevent the super-heavy oil from condensing on the inner wall of the liquid outlet pipeline 51, thereby ensuring the fluidity of the mixed liquid in the liquid outlet pipeline 51 and facilitating the smooth flow of the mixed liquid into the separation storage device 4.

[0062] The injection device 3 is arranged on the liquid inlet pipeline 52 of the well to be measured 5, and is connected to both the oil pipe 11 and the separation storage device 4. By setting the injection device 3, the pressure of the liquid in the liquid inlet pipeline 52 can be increased to ensure that the power fluid is injected into the oil pipe 11 under sufficient pressure.

[0063] The separation storage device 4 contains power fluid, which is used to provide the liquid required by the hydraulic pump 12 for hydraulic lifting to the liquid inlet pipeline 52. Generally, the power fluid is water or a water-containing oil-water mixture.

[0064] Therefore, in the super-heavy oil production system provided by the embodiment of the present application, since the separation storage device 4 contains power fluid, when the system is in use, the power fluid in the separation storage device 4 can flow into the oil pipe 11 through the liquid inlet pipeline 52 under the pumping action of the liquid injection device 3. After the power fluid is injected into the oil pipe 11, it is pumped into the formation through the hydraulic pump 12; under the lifting action of the hydraulic pump 12, the mixed liquid of the power fluid and the formation production fluid flows from the oil casing annulus into the liquid outlet pipeline 51; when passing through the heating device 2, the temperature of the heated mixed liquid increases, which can ensure the fluidity of the mixed liquid; when the mixed liquid enters the separation storage device 4, the oil and water are separated in the separation storage device 4, and the separated liquid is used as the power fluid again, and under the pumping action of the liquid injection device 3, it flows into the oil pipe 11 through the liquid inlet pipeline 52, thereby realizing the recycling of the power fluid. The system adopts a combination of hydraulic pump 12 lifting, power fluid heating internal circulation and oil-water separation using separation storage device 4 to achieve the recovery of super heavy oil, replacing high energy consumption methods such as steam injection thermal recovery, oil layer burning, hot water plus chemical huff and puff in related technologies, reducing production energy consumption and achieving low-cost development of heavy oil.

[0065] The structure of the super heavy oil recovery system provided in the embodiment of the present application is further described below:

[0066] Figure 2 This is a schematic diagram of the structure of a hydraulic pump in an ultra-heavy oil production system provided in an embodiment of the present application. Figure 2 In some embodiments, the hydraulic pump 12 includes a pump barrel 121 and a pump core 122 .

[0067] The interior of the pump barrel 121 is hollow and is provided with a first liquid outlet 1211 to facilitate the mixed liquid to flow out of the pump barrel 121; the pump core 122 is detachably arranged inside the pump barrel 121, that is, the pump barrel 121 and the pump core 122 are separable from each other.

[0068] The pump core 122 includes a first part 1221, a second part 1222 and a third part 1223 which are arranged in sequence along the direction from the first end 1212 to the second end 1213 of the pump barrel 121. The interiors of the first part 1221, the second part 1222 and the third part 1223 are all hollow to facilitate the passage of liquid; the first part 1221 is connected to the second part 1222, so that water in the oil pipe 11 can enter the second part 1222 via the first part 1221; a barrier 1224 is provided between the second part 1222 and the third part 1223, that is, the second part 1222 and the third part 1223 are not connected, ensuring that the liquid in the second part 1222 will not flow into the third part 1223.

[0069] A first liquid inlet hole 12211 is provided at one end of the first part 1221 close to the first end 1212, and a nozzle 12212 is provided at one end of the first part 1221 away from the first end 1212. The high-pressure power fluid flowing into the first part 1221 through the oil pipe 11 can enter the first part 1221 through the first liquid inlet hole 12211, and then be ejected through the nozzle 12212 to form a high-speed jet flow; a sealing member 12213 is provided on the outer wall of the first part 1221 to play a separating role and prevent the high-pressure power fluid in the oil pipe 11 from entering the annular area between the second part 1222 and the pump barrel 121.

[0070] A second liquid inlet hole 12221 is provided on the side of the second part 1222 facing the first part 1221, and the second liquid inlet hole 12221 is connected to the interior of the pump barrel 121. Due to the high-speed jet flow ejected from the nozzle 12212, a low-pressure area is formed at the second liquid inlet hole 12221. When the second liquid inlet hole 12221 is connected to the interior of the pump barrel 121, the formation production fluid is sucked into the interior of the pump barrel 121 and enters the second part 1222. A second liquid outlet hole 12222 is provided on the side of the second part 1222 away from the first part 1221, and the second liquid outlet hole 12222 is connected to the first liquid outlet hole 12222. The hole 1211 is connected, and inside the second part 1222, the power fluid and the formation production fluid form a mixed liquid. These mixtures can flow into the casing annulus through the second liquid outlet hole 12222 and the first liquid outlet hole 1211, that is, flow out of the hydraulic pump 12; the aperture of the second liquid outlet hole 12222 is smaller than the aperture of the first liquid outlet hole 1211, and by setting the aperture of the second liquid outlet hole 12222 to be smaller than the aperture of the first liquid outlet hole 1211, it is ensured that the mixed liquid has sufficient pressure when flowing out of the second liquid outlet hole 12222, can obtain a larger initial velocity, and then smoothly enter the liquid outlet pipeline 51.

[0071] The third part 1223 is provided with a third liquid outlet hole 12231, and the third liquid outlet hole 12231 is connected to the interior of the pump barrel 121. The third part 1223 is provided with a third liquid inlet hole 12232 at one end close to the second end 1213. That is to say, after the formation production fluid enters the pump barrel 121, it enters the third part 1223 from the third liquid inlet hole 12232, and flows out from the third liquid outlet hole 12231 into the annular space between the pump barrel 121 and the pump core 122.

[0072] It should be noted that a one-way valve (not shown in the figure) is provided on the side of the hydraulic pump 12 away from the wellhead, and the one-way valve is opened when the pressure on the side close to the wellhead is lower than the pressure on the side away from the wellhead.

[0073] The working principle of the hydraulic pump 12 can be as follows: the power fluid pressurized by the injection device 3 flows through the oil pipe 11, first enters the pump barrel 121, then enters the first part 1221 through the first liquid inlet hole 12211, and then sprays out from the nozzle 12212 of the first part 1221 in the form of a high-speed jet, and then forms a low-pressure area near the second liquid inlet hole 12221 of the second part 1222, so that the one-way valve of the hydraulic pump 12 is opened, and the formation output fluid is sucked into the third part 1223 through the pressure difference; the formation output fluid is under the action of the low-pressure area. The oil-water mixture flows into the pump barrel 121, enters the third part 1223 through the third liquid inlet hole 12232, flows out from the third liquid outlet hole 12231 into the annular space between the pump barrel 121 and the pump core 122, and finally enters the second part 1222 from the second liquid inlet hole 12221, and mixes with the power fluid in the second part 1222 to form a mixed liquid containing super heavy oil; the oil-water mixture flows out of the hydraulic pump 12 through the second liquid outlet hole 12222 and the first liquid outlet hole 1211, and then flows into the oil casing annulus.

[0074] The above-mentioned hydraulic lifting technology can completely eliminate the problem of short pump inspection cycle caused by eccentric wear of rods and pipes. At the same time, water is mixed with the formation production fluid containing super-heavy oil to reduce viscosity and facilitate pipeline transportation. The power source of the hydraulic pump is high-pressure water. The energy consumption is reduced by 40% compared with high-energy consumption methods such as steam injection thermal recovery, fire burning oil layers, hot water plus chemical throughput in related technologies, thus realizing the low-cost development of super-heavy oil.

[0075] In some embodiments, see Figure 1 The production device 1 also includes a screen tube 13 and a plug 14.

[0076] The plug 14 is disposed at one end of the oil pipe 11 away from the wellhead and is configured to seal the oil pipe 11 to prevent parts of the production device 1 from falling and being unable to be recovered.

[0077] The screen tube 13 is disposed on the oil pipe 11 and is located between the hydraulic pump 12 and the plug 14 , and is used to block large particles of impurities in the oil layer to prevent the large particles of impurities from entering the hydraulic pump 12 and damaging the hydraulic pump 12 .

[0078] In some embodiments, the heating device 2 includes a first pipe heater (not shown) and a second pipe heater (not shown), wherein the first pipe heater and the second pipe heater are connected in series.

[0079] By configuring the heating device 2 as two pipeline heaters running in series, one pipeline heater can be selected to run or two pipeline heaters can be run simultaneously according to the temperature of the liquid in the liquid outlet pipeline 51. The heating device 2 is used to heat the liquid in the liquid outlet pipeline 51 to ensure that the mixed liquid containing the super-heavy oil does not solidify and flows smoothly in the system pipeline.

[0080] In addition, in addition to the above-mentioned structural forms, the heating device 2 provided in the embodiment of the present application can also be in other structural forms, for example, a structural form of mixed heating of a pipe heater and an air heat source pump.

[0081] In some embodiments, see Figure 1 The separation storage device 4 includes a processing tank 41 and a heating component 42.

[0082] The interior of the processing tank 41 is hollow, and the heating assembly 42 includes a heating portion 421 and a first display portion 422. The heating portion 421 is disposed inside the processing tank 41 and is configured to heat the liquid containing super-heavy oil in the processing tank 41; the first display portion 422 is disposed outside the processing tank 41 to facilitate an operator to observe and determine the temperature of the heated liquid.

[0083] It should be noted that, since the density of oil is less than that of water, in the processing tank 41, the lower part is water and the upper part is oil, and the heating component 42 is mainly used to heat the liquid containing the super-heavy oil. Therefore, the heating component 42 needs to be set at a preset height of the liquid storage tank 41 to increase the fluidity of the super-heavy oil and facilitate the external transportation of the super-heavy oil.

[0084] In some embodiments, see Figure 1 The separation storage device 4 also includes a temperature sensor 43 and a liquid level sensor 44.

[0085] The temperature sensor 43 is disposed inside the processing tank 41 and is used to detect the temperature of the liquid inside the separation storage device 4 .

[0086] The liquid level sensor 44 includes a measuring part 441 and a second display part 442. The measuring part 441 is arranged inside the processing tank 41, and the second display part 442 is arranged outside the processing tank 41. The measuring part 441 is used to measure the liquid level height of the liquid in the processing tank 41, and the second display part 442 is used to display the liquid level height data to the operator.

[0087] In some embodiments, see Figure 1 The separation storage device 4 also includes a screw pump 45 and an external transmission pipeline 46.

[0088] The upper portion of the treatment tank 41 has a fourth liquid outlet, and the treatment tank 41 is connected to the external transmission pipeline 46 through the fourth liquid outlet 411 ; the screw pump 45 is arranged on the external transmission pipeline 46 .

[0089] By providing the external transmission pipeline 46 and the screw pump 45 , the liquid containing the super-heavy oil located at the upper part of the processing tank 41 can be easily transported outwards under the pumping action of the screw pump 45 .

[0090] It should be noted that the length of the external transmission pipeline 46 is not specifically limited in the embodiment of the present application.

[0091] In some embodiments, see Figure 1 The separation storage device also includes a liquid replenishment pipeline 47 and a valve 48.

[0092] The liquid replenishing pipeline 47 is disposed at one side of the processing tank 41 and communicated with the interior of the processing tank 41 ; the valve 48 is disposed on the liquid replenishing pipeline 47 .

[0093] By providing the valve 48 and the liquid replenishing pipeline 47, when the valve 48 is opened, the power liquid is replenished into the processing tank 41 to ensure the normal production.

[0094] When the extra-heavy oil recovery system provided in the embodiment of the present application is operating normally, the valve 48 is in a normally closed state, and the valve 48 is opened only when fluid replenishment is required.

[0095] In some embodiments, see Figure 1 The liquid injection device 3 includes a water injection pump 31 and a dosing component 32.

[0096] One end of the dosing assembly 32 is connected to the lower part of the processing tank 41 , and the other end is connected to one end of the water injection pump 31 , and the other end of the water injection pump 31 is connected to the oil pipe 11 of the well 5 to be tested.

[0097] A water injection pump 31 is provided to provide injection power for the power fluid injected into the oil pipe 11; a dosing assembly 32 is provided to add viscosity reducers and / or corrosion inhibitors and other agents into the power fluid to reduce the viscosity of the super-heavy oil and ensure the recovery of the super-heavy oil.

[0098] In some embodiments, the water injection pump 31 may be a high-pressure plunger pump.

[0099] In some embodiments, see Figure 1 The dosing assembly 32 includes a dosing pump 321 , a dosing tank 322 and a dosing pipeline 323 .

[0100] The dosing line 323 is in communication with the liquid inlet line 52 , and the dosing tank 322 and the dosing pump 321 are disposed on the dosing line 323 .

[0101] The dosing tank 322 is provided to store drugs such as viscosity reducers and / or corrosion inhibitors; the dosing pump 321 is provided to determine the amount of dosing. For example, the dosing amount can be referred to the following tables 1 and 2:

[0102] Table 1 Schematic diagram of preferred viscosity reducers

[0103]

[0104] Table 2 Schematic diagram of viscosity reducer preference

[0105]

[0106] According to Table 1 and Table 2 above, the system dosage is controlled to achieve a 6°C reduction in the power fluid pipeline temperature loss, an adjustment of the power fluid temperature from 82.2°C to 67.9°C, an optimization of the daily dosage from 40 kg to 13 kg, a reduction in the monthly power consumption of a single well from 109,000 kWh to 68,000 kWh, and a reduction in the daily dosage from 40 kg to 13 kg, saving RMB 484,000 in annual costs.

[0107] In some embodiments, see Figure 1 The super heavy oil production system provided in the embodiment of the present application also includes a control device 6.

[0108] The control device 6 is signal-connected with the hydraulic pump 12 , the heating device 2 , the injection device 3 and the separation storage device 4 .

[0109] By providing the control device 6 , the control device 6 can be used to realize opening or closing of the hydraulic pump 12 , the heating device 2 , the liquid injection device 3 and the separation storage device 4 .

[0110] Furthermore, the control device 6 is signal-connected to the water injection pump 31 and the dosing pump 321 in the liquid injection device 3 , and is signal-connected to the heating component 42 , the temperature sensor 43 , the liquid level sensor 44 , the screw pump 45 and the valve 48 in the separation storage device 4 .

[0111] When the water injection pump 31 is a high-pressure plunger pump, the high-pressure plunger pump adopts a frequency conversion method to transmit production data (including wellhead flow and pressure change value) to the control device 6. The control device 6 controls the operation of the water injection pump 31 based on the production data to ensure the normal operation of the system.

[0112] The control device 6 can control the opening and closing of the heating device 2 and the heating component 42 according to the different seasons, the temperature of the low-density layer of the mixed liquid and the temperature of the high-density layer of the mixed liquid, and turn on when the temperature is too high and turn off when it is too low, so as to ensure that the temperature is in a normal range suitable for the operation of the ultra-heavy oil production system.

[0113] After receiving the liquid level data from the liquid level sensor 44, the control device 6 controls the screw pump 45 to increase the speed in response to the liquid level being greater than the preset height; controls the screw pump 45 to reduce the speed in response to the liquid level being lower than the preset height, and controls the valve 48 to open.

[0114] It can be understood that when the liquid level is too high, the screw pump 45 speeds up the liquid delivery speed, and when the liquid level is too low, the screw pump 45 slows down the liquid delivery speed and opens the valve 48 at the same time to replenish the sewage in the high-density layer of the mixture through the liquid replenishment pipeline 47. When there is too much sewage, the screw pump 45 can also discharge the sewage to ensure the normal operation of the system.

[0115] Based on the above description of the structure of the extra-heavy oil production system, the specific implementation method of production based on the extra-heavy oil production system is described below:

[0116] (1) Preparation before production

[0117] The heating device 2 and the heating assembly 42 are controlled to start by the control device 6;

[0118] The temperature and liquid level values ​​are set in the control device 6 to ensure that the liquid level inside the processing tank 41 (when the liquid level is too low, the liquid is replenished through the liquid replenishment pipeline 48) is maintained at a preset liquid level;

[0119] Add the agent to the dosing tank 322;

[0120] The water injection pump 31 is controlled to start by the control device 6 to pressurize the power fluid in the liquid inlet pipeline 52 to ensure that the power fluid is pressurized and injected into the oil pipe 11;

[0121] In response to the temperature sensor 43 detecting that the temperature of the power fluid exceeds a preset temperature, the control device 6 controls the water injection pump 31 to be turned off.

[0122] It should be noted that: before production, the hydraulic pump 12 does not have the pump core 122 placed therein. Due to the presence of the one-way valve in the hydraulic pump 12, after the power fluid enters the hydraulic pump 12 from the oil pipe 11, it can directly enter the oil casing annulus and then flow out from the liquid outlet pipeline 51, thereby realizing the circulating heating of the power fluid. When the temperature sensor 43 detects that the water temperature exceeds the preset temperature, the control device 6 controls the injection device 3 to close, thereby realizing the heating of the circulating injected power fluid.

[0123] (2) The well to be tested is in normal production

[0124] After the temperature of the power fluid reaches the required level, a pump core 122 is placed into the hydraulic pump 12;

[0125] The water injection pump 31 and the dosing pump 321 are controlled to start by the control device 6, so that the high-temperature power fluid after dosing is pressurized by the water injection pump 31 and then transported to the oil pipe 11. After the high-pressure and high-temperature fluid passes through the hydraulic pump 12, it is ejected from the nozzle in the hydraulic pump 12 to form a high-speed jet, forming a low-pressure area around the nozzle. The formation produced fluid enters the low-pressure area under the action of the formation pressure. Due to the rapid flow of the high-temperature and high-pressure power fluid, the formation produced fluid entering the low-pressure area is brought into the pump core 122 to obtain kinetic energy, forming a mixed liquid of the power fluid and the formation produced fluid; as the flow channel area in the pump core 122 gradually expands, the flow rate of the mixed liquid decreases, the kinetic energy is converted into pressure energy, the pressure increases, and finally it flows from the oil casing annulus to the ground and enters the heating device 2;

[0126] Ensure that the heating device 2 is in a normally open state, so that the heating device 2 heats the mixed liquid produced by the well to be logged 5, thereby heating the circulating power fluid and the crude oil in the mixed liquid produced by the well to be logged 5, thereby achieving primary heating of the super-heavy oil;

[0127] Ensure that the heating unit 421 is in a normally open state to heat the upper low-water crude oil, increase the fluidity of the super-heavy oil, and facilitate the transportation of the super-heavy oil;

[0128] The control device 6 controls the screw pump 45 to start, so that the low-water crude oil in the processing tank 41 is transported to the outside through the external transport pipeline 46 .

[0129] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0130] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0131] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An extra heavy oil production system, characterized in that: The system comprises: a production device (1), a heating device (2), a liquid injection device (3) and a separation storage device (4); The production device (1) is arranged in the wellhead of the well to be tested (5), and the production device (1) comprises an oil pipe (11) and a hydraulic pump (12), and the hydraulic pump (12) is arranged on the oil pipe (11); The heating device (2) is arranged on the liquid outlet pipeline (51) of the well to be tested (5), and is in communication with the casing annulus of the well to be tested (5) and the separation storage device (4); The liquid injection device (3) is arranged on the liquid inlet pipeline (52) of the well to be tested (5), and is connected to both the oil pipe (11) and the separation storage device (4); The separation storage device (4) contains power fluid.

2. The super heavy oil production system according to claim 1, characterized in that: The hydraulic pump (12) comprises a pump barrel (121) and a pump core (122); The interior of the pump barrel (121) is hollow and provided with a first liquid outlet (1211); the pump core (122) is detachably arranged inside the pump barrel (121); The pump core (122) comprises a first portion (1221), a second portion (1222) and a third portion (1223) which are sequentially arranged along a direction from a first end (1212) to a second end (1213) of the pump barrel (121); the first portion (1221), the second portion (1222) and the third portion (1223) are all hollow inside; the first portion (1221) is communicated with the second portion (1222); and a barrier (1224) is arranged between the second portion (1222) and the third portion (1223); A first liquid inlet hole (12211) is provided at one end of the first part (1221) close to the first end (1212), a nozzle (12212) is provided at one end of the first part (1221) away from the first end (1212), and a sealing member (12213) is provided on an outer wall of the first part (1221); A second liquid inlet hole (12221) is provided on a side of the second part (1222) facing the first part (1221), and the second liquid inlet hole (12221) is communicated with the interior of the pump barrel (121); a second liquid outlet hole (12222) is provided on a side of the second part (1222) away from the first part (1221), and the second liquid outlet hole (12222) is communicated with the first liquid outlet hole (1211), wherein the aperture of the second liquid outlet hole (12222) is smaller than the aperture of the first liquid outlet hole (1211); The third portion (1223) is provided with a third liquid outlet hole (12231), and the third liquid outlet hole (12231) is connected to the interior of the pump barrel (121); and a third liquid inlet hole (12232) is provided at one end of the third portion (1223) close to the second end (1213).

3. The super heavy oil production system according to claim 1, characterized in that: The separation storage device (4) comprises a processing tank (41) and a heating component (42); The interior of the processing tank (41) is hollow, and the heating component (42) includes a heating part (421) and a first display part (422), wherein the heating part (421) is arranged inside the processing tank (41), and the first display part (422) is arranged outside the processing tank (41).

4. The super heavy oil production system according to claim 3, characterized in that: The separation storage device further comprises a temperature sensor (43) and a liquid level sensor (44); The temperature sensor (43) is arranged inside the processing tank (41); The liquid level sensor (44) comprises a measuring part (441) and a second display part (442); the measuring part (441) is arranged inside the processing tank (41), and the second display part (442) is arranged outside the processing tank (41).

5. The super heavy oil production system according to claim 3, characterized in that: The separation storage device (4) further comprises a screw pump (45) and an external transmission pipeline (46); The upper portion of the treatment tank (41) is provided with a fourth liquid outlet (411), and the treatment tank (41) is connected to the external transmission pipeline (46) through the fourth liquid outlet (411); The screw pump (45) is arranged on the external transmission pipeline (46).

6. The super heavy oil production system according to claim 3, characterized in that: The separation storage device further comprises a liquid replenishment pipeline (47) and a valve (48); The liquid replenishment pipeline (47) is arranged on one side of the treatment tank (41) and is communicated with the interior of the treatment tank (41); The valve (48) is arranged on the fluid infusion pipeline (47).

7. The super heavy oil production system according to claim 3, characterized in that: The liquid injection device (3) comprises a water injection pump (31) and a drug adding component (32); One end of the dosing assembly (32) is connected to the lower part of the processing tank (41), and the other end is connected to one end of the water injection pump (31), and the other end of the water injection pump (31) is connected to the oil pipe (11) of the well to be tested (5).

8. The super heavy oil production system according to claim 7, characterized in that: The dosing assembly (32) includes a dosing pump (321), a dosing tank (322) and a dosing pipeline (323); The dosing line (323) is in communication with the liquid inlet line (52), and the dosing tank (322) and the dosing pump (321) are arranged on the dosing line (323).

9. The super heavy oil production system according to claim 1, characterized in that: The production device (1) further comprises a screen tube (13) and a plug (14); The plug (14) is arranged at an end of the oil pipe (11) away from the wellhead and is configured to seal the oil pipe (11); The screen tube (13) is arranged on the oil pipe (11) and is located between the hydraulic pump (12) and the plug (14).

10. The super heavy oil production system according to claim 1, characterized in that: The system further comprises a control device (6); The control device (6) is signal-connected to the hydraulic pump (12), the heating device (2), the liquid injection device (3) and the separation storage device (4).

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