A screw pump oil production system

Abstract

The present invention relates to a screw pump oil production system, including a ground drive mechanism and an underground oil production mechanism, wherein the output end of the ground drive mechanism is connected to the underground oil production mechanism, the ground drive mechanism includes a compression control cabinet and an air injection pipe, the compression control cabinet is arranged on the ground, one end of the air injection pipe is connected to the compression control cabinet, and the other end of the air injection pipe is connected to the underground oil production mechanism; the underground oil production mechanism includes a first sucker rod, the top of the first sucker rod has a cartridge valve, and the other end of the air injection pipe is connected to the first sucker rod through the cartridge valve. The gas drive device using compressed air has a simple structure, and can save the drive devices such as motors and bearing boxes required for electric drive, thereby reducing the cost of the device, improving the utilization rate, and further enhancing the stability of the system, and can be applied to a well site environment with strong wind force.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment, and in particular to a screw pump oil production system. Background Art

[0002] All-metal intelligent conical screw pumps are designed to handle high-pressure gases or liquids and are often used in industrial applications where the medium needs to be transported to a high-pressure system or equipment. All-metal intelligent conical screw pumps are usually equipped with advanced control systems to monitor and adjust the operating status of the pump. This helps improve efficiency, ensure safety, and achieve remote monitoring and automated control. Electric drive is a widely used drive method in oil production equipment. This method converts electrical energy into mechanical energy through an electric motor to drive the equipment to achieve the oil production process of the oil well. The current problems with this drive method are as follows:

[0003] (1) The electric drive system usually requires a large number of cables, motors, controllers and other equipment. The electric equipment will generate a lot of heat during operation, which requires an additional cooling system to handle, making the entire system complex and large. During the on-site installation process, it is limited by space, the equipment configuration is inflexible, and it is difficult to adapt to the needs of different well site environments.

[0004] (2) The electronic control system is very sensitive to the quality of power supply. Power fluctuations may cause erroneous operation or failure of the control system. Transient voltage fluctuations of the equipment may easily cause premature shutdown or accidental start-up of the system, resulting in mechanical fatigue or other damage.

[0005] (3) The complexity of the electronic control system makes maintenance difficult. Failures need to be diagnosed and repaired by professional technicians, especially in remote or harsh oil fields. This increases the manufacturing and maintenance costs of the equipment. In extreme weather or disaster conditions, power supply interruptions may occur, causing the screw pump to shut down, which may further cause water drive and reversal. In severe cases, it may even cause the screw pump to trip and fall into the well, posing a huge safety hazard. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a screw pump oil production system to solve one or more problems in the prior art.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A screw pump oil production system includes a ground drive mechanism and an underground oil production mechanism, wherein the output end of the ground drive mechanism is connected to the underground oil production mechanism, the ground drive mechanism includes a compression control cabinet and an air injection pipe, the compression control cabinet is arranged on the ground, one end of the air injection pipe is connected to the compression control cabinet, and the other end of the air injection pipe is connected to the underground oil production mechanism.

[0009] Furthermore, the underground oil production mechanism includes a first sucker rod, a top of the first sucker rod is provided with a cartridge valve, and the other end of the gas injection pipe is connected to the first sucker rod through the cartridge valve.

[0010] Furthermore, the underground oil production mechanism also includes a gas injection support rod and a driving screw, one end of the gas injection support rod is connected to the first sucker rod through a first joint, the other end of the gas injection support rod is connected to one end of the driving screw through a first casing, and a gas injection hole is opened at the top of the driving screw.

[0011] Furthermore, a first bearing and a second bearing are provided at both ends of the driving screw, a fixing nut is provided at the top of the driving screw, and the bottom of the driving screw is also connected to a third casing. The underground oil production mechanism also includes a second casing, and a part of the gas injection support rod, the first casing, the driving screw and the third casing are all arranged in the second casing, and a first oil pipe is arranged outside the second casing.

[0012] Furthermore, the screw pump oil production system also includes a lifting assembly and a steam injection mechanism, the lifting assembly is arranged between the ground driving mechanism and the steam injection mechanism, the steam injection mechanism includes a first pipeline and a second pipeline, the first pipeline is connected to the first sucker rod through a first four-way pipe, and the second pipeline is connected to the first sucker rod through a second four-way pipe.

[0013] Furthermore, the first pipeline has an air injection port and an oil outlet, and the first pipeline near the oil outlet is sequentially provided with a wellhead sensor, a remote pressure-blocking valve, a one-way valve and a well temperature sensor;

[0014] The first pipeline further includes a sealing packing box and a sealing ball valve, and both the sealing packing box and the sealing ball valve are connected to the first sucker rod.

[0015] Furthermore, a pressure sensor is arranged on one side of the second pipeline, a first valve body is arranged on both sides of the first pipeline, and a second valve body is arranged on both sides of the second pipeline.

[0016] Furthermore, a first support plate, at least four support columns and a second support plate are arranged between the lifting assembly and the steam injection mechanism, one end of the support column is connected to the first support plate, and the other end of the support column is connected to the second support plate.

[0017] Furthermore, a portion of the first sucker rod close to the lifting assembly is sleeved with slips;

[0018] A protective shell is sleeved outside the first sucker rod located between the lifting assembly and the steam injection mechanism.

[0019] Furthermore, the underground oil production mechanism also includes a second sucker rod, one end of the second sucker rod is connected to the driving screw via a second joint, and the other end of the second sucker rod is connected to the rotor via a third joint, and the rotor is built into the stator.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0021] (1) The present invention sets a ground driving mechanism and an underground oil production mechanism. The ground driving mechanism includes a compression control cabinet and an air injection pipe. The compression control cabinet is set on the ground. One end of the air injection pipe is connected to the compression control cabinet, and the other end of the air injection pipe is connected to the underground oil production mechanism. The gas drive device of compressed air has a simple structure and can save the driving devices such as the motor and bearing box required for electric drive, thereby reducing the cost of the device and improving the utilization rate. At the same time, it reduces the weight of the ground supporting equipment, avoids the "top-heavy" phenomenon of the electric drive equipment, further enhances the stability of the system, and can be suitable for the well site environment with strong wind.

[0022] (ii) Furthermore, the ground drive mechanism designed by the present invention greatly reduces the problem of sudden shutdown of oil fields due to large-scale weather or disasters, thereby effectively avoiding the water drive phenomenon and reversal caused by sudden shutdown of the screw pump, and further avoiding the risk of the screw pump falling into the well due to reversal tripping, effectively ensuring the stable oil output rate of the equipment, reducing equipment damage, and reducing the maintenance cost of the equipment.

[0023] (iii) Furthermore, by setting up a steam injection mechanism to inject steam to melt the crude oil in the formation, the normal production of the underground oil production mechanism is ensured, and the efficiency, effectiveness and safety of the system are improved.

[0024] (iv) Furthermore, by providing a sealing packing box and a sealing ball valve, when the system needs to inject steam, the top of the sealing ball valve can be used to block the bottom of the sealing packing box, thereby ensuring that the injected steam will not leak upward, thereby achieving the steam injection process.

[0025] (V) Furthermore, by setting a slip, the first sucker rod is clamped to fix the position of the first sucker rod so that the first sucker rod will not get loose and fall into the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A structural schematic diagram of a screw pump oil production system according to an embodiment of the present invention is shown.

[0027] Figure 2 A schematic structural diagram of a ground drive mechanism and a lifting assembly in a screw pump oil production system according to an embodiment of the present invention is shown.

[0028] Figure 3A schematic structural diagram of a lifting assembly and a steam injection mechanism in a screw pump oil production system according to an embodiment of the present invention is shown.

[0029] Figure 4 A partial structural enlarged view of a steam injection mechanism in a screw pump oil production system according to an embodiment of the present invention is shown.

[0030] Figure 5 A first partial structural cross-sectional view of an underground oil production mechanism in a screw pump oil production system according to an embodiment of the present invention is shown.

[0031] Figure 6 A second partial structural cross-sectional view of an underground oil production mechanism in a screw pump oil production system according to an embodiment of the present invention is shown.

[0032] Markings in the attached drawings: 1, ground drive mechanism; 100, compression control cabinet; 101, gas injection pipe; 2, lifting assembly; 3, underground oil production mechanism; 300, first sucker rod; 3000, cartridge valve; 301, gas injection support rod; 302, protection shell; 303, drive screw; 304, gas injection hole; 305, slip; 306, first joint; 307, first casing; 308, sealing packing; 309, sealing gasket; 310, second casing; 311, fixing nut; 312, first bearing; 313, second bearing; 314, first oil pipe; 315, third casing; 316, second sucker rod; 317, rotor ; 318, stator; 319, second joint; 320, third joint; 321, sealed chamber; 4, steam injection mechanism; 400, first pipeline; 4001, sealed packing box; 4002, sealed ball valve; 4003, remote pressure-closing valve; 4004, one-way valve; 4005, first valve body; 4006, wellhead sensor; 4007, well temperature sensor; 4008, first four-way pipe; 4009, gas injection port; 4010, oil outlet; 410, second pipeline; 4100, pressure sensor; 4101, second valve body; 4102, second four-way pipe; 5, first support plate; 6, support column; 7, second support plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following is a further detailed description of a screw pump oil production system proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0034] The specific structure of a screw pump oil production system is described below:

[0035] Please refer to Figures 1 to 6 A screw pump oil production system includes a ground drive mechanism 1 and an underground oil production mechanism 3. The output end of the ground drive mechanism 1 is connected to the underground oil production mechanism 3. The ground drive mechanism 1 provides a power source for the underground oil production mechanism 3 and a control method for the screw pump system. The ground drive mechanism 1 includes a compression control cabinet 100 and an air injection pipe 101. The compression control cabinet 100 is arranged on the ground. Specifically, in this embodiment, the compression control cabinet 100 has a built-in air compressor and an intelligent control cabinet. The air compressor injects compressed air into the first sucker rod 300 through the air injection pipe 101. One end of the air injection pipe 101 is connected to the compression control cabinet 100, and the other end of the air injection pipe 101 is connected to the underground oil production mechanism 3.

[0036] Furthermore, the underground oil production mechanism 3 includes a first sucker rod 300. Specifically, the first sucker rod 300 is a hollow sucker rod for gas injection. A cartridge valve 3000 is provided on the top of the first sucker rod 300. The other end of the gas injection pipe 101 is connected to the first sucker rod 300 through the cartridge valve 3000.

[0037] For further information, please refer to Figure 5The underground oil production mechanism 3 also includes a gas injection support rod 301 and a driving screw 303. One end of the gas injection support rod 301 is connected to the first sucker rod 300 through a first joint 306, and the other end of the gas injection support rod 301 is connected to one end of the driving screw 303 through a first sleeve 307 to prevent gas leakage in the gas injection support rod 301, that is, to ensure that the transmitted compressed air can be transmitted to the driving screw 303. Furthermore, a sealing packing 308 and a sealing gasket 309 are also arranged between the gas injection support rod 301 and the first sleeve 307 to further ensure the air tightness between the two and avoid gas leakage. A gas injection hole 304 is opened at the top of the driving screw 303 to collect compressed air from the first sucker rod 300.

[0038] For further information, please continue to refer to Figure 5 The first bearing 312 and the second bearing 313 are arranged at both ends of the driving screw 303. Specifically, the first bearing 312 is a load-bearing bearing for bearing the weight of the sucker rod and the crude oil. The second bearing 313 is a straightening bearing for ensuring the coaxiality of the driving screw 303 and the third sleeve 315 so as not to cause eccentric wear of the driving screw 303. A fixing nut 311 is arranged at the top of the driving screw 303. Specifically, the top of the driving screw 303 is a long handle with a thread, which is threadedly connected with the fixing nut 311. The fixing nut 311 is pressed on the load-bearing bearing above the driving screw 303, and the driving screw 303 is suspended at the same time. 03, plays a limiting role, the bottom of the driving screw 303 is also connected to the third casing 315, specifically, the first casing 307 and the third casing 315 are both sealed connecting casings, which play a sealing role to prevent gas leakage, the underground oil production mechanism 3 also includes a second casing 310, specifically, the second casing 310 is a gas injection casing, and the gas injection support rod 301 drives the driving screw 303 to rotate through compressed gas, a part of the gas injection support rod 301, the first casing 307, the driving screw 303 and the third casing 315 are all arranged in the second casing 310, and the first oil pipe 314 is arranged outside the second casing 310.

[0039] For further information, please refer to Figure 2 and Figure 3The screw pump oil production system also includes a lifting assembly 2 and a steam injection mechanism 4. In the embodiment of the present invention, the lifting assembly 2 is a prior art in the art, and its specific structure is not described in detail here. By setting the lifting assembly 2, the first sucker rod 300 and other structures connected to the first sucker rod 300 can be controlled to move up and down while rotating to adjust the position of the rotor 317, and finally adjust the matching clearance between the stator 318 and the rotor 317 to complete a series of tasks such as sand discharge, steam injection and pump efficiency adjustment, thereby effectively improving the operation efficiency of the system. The steam injection mechanism 4 is used to inject steam. Specifically, during the production process, when the temperature of the crude oil in the formation decreases, the viscosity will increase, making it difficult for the equipment to be produced normally. Therefore, steam needs to be injected to melt the crude oil in the formation to ensure the normal production of the underground oil production mechanism 3. The steam injection mechanism 4 includes a first pipeline 400 and a second pipeline 410. The first pipeline 400 is connected to the first sucker rod 300 through a first four-way pipe 4008, and the second pipeline 410 is connected to the first sucker rod 300 through a second four-way pipe 4102.

[0040] For further information, please continue to refer to Figure 3 , the first pipeline 400 has an air injection port 4009 and an oil outlet 4010, the air injection port 4009 is used to inject water vapor, and the produced oil is output from the oil outlet 4010. The first pipeline 400 near the oil outlet 4010 is sequentially provided with a wellhead sensor 4006, a remote pressure-closing valve 4003, a one-way valve 4004 and a well temperature sensor 4007. Specifically, the remote pressure-closing valve 4003 can be closed during the steam injection process through the intelligent control cabinet built into the compression control cabinet 100 to complete the normal air injection and pressure-closing operation. Under normal conditions, the remote pressure-closing valve 4003 is in an open state. The one-way valve 4004 is used to prevent impurities such as iron filings and welding slag in the first oil pipe 314 from entering the pump cavity with the falling fluid during shutdown, causing destructive pump jams. The wellhead sensor 4006 is used to collect the wellhead outlet pressure, and the well temperature sensor 4007 is used to collect the temperature of the crude oil at the wellhead.

[0041] For further information, please refer to Figure 4 The first pipeline 400 also includes a sealing packing box 4001 and a sealing ball valve 4002. The sealing packing box 4001 and the sealing ball valve 4002 are both connected to the first sucker rod 300. Specifically, when the first sucker rod 300 is lifted, the top of the sealing ball valve 4002 can block the bottom of the sealing packing box 4001, thereby ensuring that the injected steam does not leak upward.

[0042] Furthermore, a pressure sensor 4100 is provided on one side of the second pipeline 410 . Specifically, the second pipeline 410 is a pressure tube, and the pressure sensor 4100 is used to collect the pressure in the pressure tube. A first valve body 4005 is provided on both sides of the first pipeline 400 , and a second valve body 4101 is provided on both sides of the second pipeline 410 .

[0043] For further information, please refer to Figure 3 A first support plate 5, at least four support columns 6 and a second support plate 7 are arranged between the lifting assembly 2 and the steam injection mechanism 4, one end of the support column 6 is connected to the first support plate 5, and the other end of the support column 6 is connected to the second support plate 7.

[0044] Furthermore, a slip 305 is provided on a portion of the first sucker rod 300 close to the lifting assembly. Specifically, the slip 305 clamps the first sucker rod 300 to fix the position of the first sucker rod 300 so that the first sucker rod 300 will not get loose and fall into the well. At the same time, it serves as a downward limit for the lifting assembly 2 to prevent the lifting assembly 2 from exceeding the downward stroke and causing a jam.

[0045] Furthermore, a protective shell 302 is provided outside the first sucker rod 300 located between the lifting assembly 2 and the steam injection mechanism 4 .

[0046] For further information, please refer to Figure 6 The underground oil production mechanism 3 also includes a second sucker rod 316, one end of the second sucker rod 316 is connected to the driving screw 303 via a second joint 319, and the other end of the second sucker rod 316 is connected to the rotor 317 via a third joint 320, and the rotor 317 is built into the stator 318.

[0047] The specific working process of a screw pump oil production system according to an embodiment of the present invention is described below:

[0048] Please refer to Figures 1 to 6 ,in,

[0049] The compressed air driving process is as follows: the compression control cabinet 100 injects compressed air into the first sucker rod 300 through the air injection pipe 101, the compressed air enters the air injection support rod 301 along the first sucker rod 300, and further enters the sealed cavity 321 formed by the driving screw 303 and the second casing 310 through the air injection hole 304. Under the continuous air injection of the compression control cabinet 100, the driving screw 303 is driven to rotate, and further the second sucker rod 316 connected to the driving screw 303 and the rotor 317 connected to the second sucker rod 316 are rotated to perform oil production.

[0050] The steam injection process is as follows: During the mining process, when the temperature of crude oil in the formation decreases, the viscosity will increase, making it difficult for the equipment to mine normally. Therefore, steam needs to be injected to melt the crude oil in the formation to ensure normal mining. Before steam injection, first lift the first sucker rod 300 through the lifting assembly 2 so that the sealing ball valve 4002 can block the sealing packing box 4001 to ensure that the gas does not leak upward. At the same time, close the remote pressure-closing valve 4003, the one-way valve 4004, the first valve body 4005, and the second pipeline 410 and the second valve body 4101 on the left side of the first pipeline 400. At this time, gas injection starts through the gas injection port 4009. Since the valves are closed and the sealing ball valve 4002 and the sealing packing box 4001 achieve a sealing effect, the steam continues to flow downward from the first sucker rod 300 and eventually enters the formation to melt the crude oil so that the equipment can mine normally. The screw pump oil production system described in the present invention significantly improves the thermal effect and fluidity of oil products in heavy oil production and reduces production costs. The ground drive mechanism 1 uses the heat naturally generated by high-pressure gas during the impact process to reduce the viscosity of heavy oil, reduce the need for additional heating and maintain the constant temperature of the oil products in the oil pipe, thereby reducing equipment losses caused by temperature fluctuations and extending the oil production cycle. In the embodiment of the present invention, after testing, the system can reduce steam energy consumption by 13.12%-15.30% and extend the production cycle of the nitrogen steam cycle throughput process by 23.91%-31.56%.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A screw pump oil production system, comprising a surface drive mechanism and an underground oil production mechanism, characterized in that: The output end of the ground driving mechanism is connected to the underground oil production mechanism, and the ground driving mechanism includes a compression control cabinet and an air injection pipe. The compression control cabinet is arranged on the ground, one end of the air injection pipe is connected to the compression control cabinet, and the other end of the air injection pipe is connected to the underground oil production mechanism; The underground oil production mechanism comprises a first sucker rod, the top of the first sucker rod is provided with a cartridge valve, and the other end of the gas injection pipe is connected to the first sucker rod through the cartridge valve; The underground oil production mechanism also includes a gas injection support rod and a driving screw, one end of the gas injection support rod is connected to the first sucker rod through a first joint, the other end of the gas injection support rod is connected to one end of the driving screw through a first sleeve, and a gas injection hole is provided on the top of the driving screw; Both ends of the driving screw are provided with a first bearing and a second bearing, a fixing nut is provided at the top of the driving screw, and a third casing is connected to the bottom of the driving screw. The underground oil production mechanism also includes a second casing, a part of the gas injection support rod, the first casing, the driving screw and the third casing are all arranged in the second casing, and a first oil pipe is arranged outside the second casing; The screw pump oil production system also includes a lifting assembly and a steam injection mechanism. The lifting assembly is arranged between the ground driving mechanism and the steam injection mechanism. The steam injection mechanism includes a first pipeline and a second pipeline. The first pipeline is connected to the first sucker rod through a first four-way pipe, and the second pipeline is connected to the first sucker rod through a second four-way pipe.

2. A screw pump oil production system according to claim 1, characterized in that: The first pipeline has an air injection port and an oil outlet, and the first pipeline near the oil outlet is sequentially provided with a wellhead sensor, a remote pressure-closing valve, a one-way valve and a well temperature sensor; The first pipeline further includes a sealing packing box and a sealing ball valve, and both the sealing packing box and the sealing ball valve are connected to the first sucker rod.

3. A screw pump oil production system as claimed in claim 2, characterized in that: A pressure sensor is arranged on one side of the second pipeline, a first valve body is arranged on both sides of the first pipeline, and a second valve body is arranged on both sides of the second pipeline.

4. A screw pump oil production system as claimed in claim 3, characterized in that: A first support plate, at least four support columns and a second support plate are arranged between the lifting assembly and the steam injection mechanism, one end of the support column is connected to the first support plate, and the other end of the support column is connected to the second support plate.

5. A screw pump oil production system as claimed in claim 4, characterized in that: The portion of the first sucker rod close to the lifting assembly is sleeved with slips; A protective shell is sleeved outside the first sucker rod located between the lifting assembly and the steam injection mechanism.

6. A screw pump oil production system as claimed in claim 5, characterized in that: The underground oil production mechanism also includes a second sucker rod, one end of which is connected to the driving screw via a second joint, and the other end of the second sucker rod is connected to a rotor via a third joint, and the rotor is built into the stator.

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