Gas field wellhead pressure energy utilization device

Abstract

The utility model provides a gas field wellhead pressure energy utilization device which comprises a cylinder body and a control system, a movable separation mechanism is arranged in the cylinder body, the movable separation mechanism and the cylinder body are connected in a sealed mode, the movable separation mechanism divides the cylinder body into a cavity A and a cavity B, and the cavity A and the cavity B are respectively provided with a distance sensor and an exhaust valve. The chamber A is provided with a first high-pressure suction valve and a first low-pressure suction valve, and the chamber B is provided with a second high-pressure suction valve and a second low-pressure suction valve; the distance sensor, the exhaust valve, the high-pressure suction valve and the low-pressure suction valve are all in electric signal connection with the control system. The movable separation mechanism is pushed to move by utilizing high pressure of the wellhead of the new well, so that low pressure energy of the wellhead of the old well is pressurized, pressure reduction output of natural gas of the wellhead of the new well and pressurization output of natural gas of the wellhead of the old well are realized, waste of the pressure energy of the wellhead of the new well is effectively avoided, and the cost is reduced. Investment for pressurizing the wellhead of an old well is reduced, production efficiency is improved, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas production technology, and in particular relates to a gas field wellhead pressure energy utilization device. Background Art

[0002] Natural gas is a vital energy resource, and its extraction technology has long been a key research topic in the oil and gas industry. Pressure control systems play a key role in natural gas extraction, effectively regulating and controlling the collection and delivery of natural gas to ensure safe and efficient production.

[0003] As gas fields develop and older wells age, wellhead pressures gradually decrease, becoming inadequate for gas gathering and transportation. Consequently, compressors and other equipment are needed to boost low-pressure gas to high pressure for long-distance transportation. Alternatively, pipeline design changes or the use of high-efficiency pumping equipment can be employed to improve fluid transportation efficiency. However, these methods often consume significant amounts of electricity, require significant equipment investment, and result in high operating costs, contradicting the need for energy conservation and efficiency improvement.

[0004] In addition, during the development of a gas field, the pressure at the wellhead of a new well is often higher, and a throttle valve is often required at the bottom of the well to control the pressure at the wellhead, or a heating furnace is required at the wellhead to heat the high-pressure gas to prevent the formation of hydrates in order to meet the requirements of gas field gathering and transportation. This not only causes a large waste of the pressure energy at the wellhead of the new well, but also results in higher energy consumption.

[0005] CN202211557297.2 A skid-mounted device and method for generating power using differential pressure of high-pressure natural gas in oil and gas fields. The high-pressure natural gas is reduced in pressure by an expansion generator and then transported to the pipeline network via a reduced-pressure natural gas transmission pipeline (B). The high-pressure natural gas then drives the expansion generator to generate differential pressure electricity, and the generated electricity is then transported to the power grid via an external transmission cable. This method can reduce the pressure of high-pressure natural gas at the wellhead, reducing it to low-pressure natural gas, and enabling grid-connected collection and transmission of natural gas. The expansion generator utilizes differential pressure electricity generated from high-pressure natural gas, fully recovering the pressure energy of the high-pressure natural gas and converting it into electrical energy for external output.

[0006] Although the above patents realize the utilization of high-pressure energy, they do not address the problem of gradual pressure drop in old wells, which makes it impossible to meet the requirements of gas field gathering and transportation. Utility Model Content

[0007] The purpose of the utility model is to provide a gas field wellhead pressure energy utilization device, which can fully utilize the pressure energy difference between old wells and new wells to achieve the purpose of reducing comprehensive investment and saving energy and reducing consumption.

[0008] To this end, the technical solutions provided by the present invention are as follows:

[0009] A gas field wellhead pressure energy utilization device includes a cylinder body and a control system. The cylinder body is provided with a movable partition mechanism, the movable partition mechanism and the cylinder body are sealed and connected to each other. The movable partition mechanism divides the cylinder body into chamber A and chamber B. Both chambers A and B are provided with distance sensors and exhaust valves. Chamber A is provided with a first high-pressure suction valve and a first low-pressure suction valve, and chamber B is provided with a second high-pressure suction valve and a second low-pressure suction valve.

[0010] The distance sensor, the exhaust valve, the first high-pressure suction valve, the first low-pressure suction valve, the second high-pressure suction valve and the second low-pressure suction valve are all electrically connected to the control system. The control system is used to monitor the data of the distance sensor in real time, and when a set value is reached, the exhaust valve, the first high-pressure suction valve, the first low-pressure suction valve, the second high-pressure suction valve and the second low-pressure suction valve are opened or closed.

[0011] The movable separation mechanism includes a separation surface and a guide column. The separation surface and the longitudinal cross-section of the cylinder body have the same shape. The guide column passes through the through hole of the separation surface and the two are slidably connected. A sealing guide sleeve is provided between the guide column and the separation surface. The sealing guide sleeve is provided in the through hole. Two guide columns are symmetrically provided and both are perpendicular to the separation surface. Both ends of the guide column are connected to the inner wall of the cylinder body.

[0012] A plurality of sealing grooves are provided on the side surface of the partition surface, and sealing rings are provided in each of the plurality of sealing grooves.

[0013] The distance sensor is an infrared distance measuring sensor, which is installed on the inner wall of the cylinder.

[0014] The control system includes a controller and a touch panel, the controller and the touch panel are electrically connected, and the touch panel is arranged on the outer wall of the cylinder body.

[0015] The cylinder body is a rectangular parallelepiped or a cylinder.

[0016] The beneficial effects of the utility model are:

[0017] The gas field wellhead pressure energy utilization device provided by the utility model utilizes the high pressure at the wellhead of a new well to drive the movement of a movable separation mechanism, thereby pressurizing the low pressure energy at the wellhead of an old well, thereby realizing the pressure-reducing and external transmission of natural gas at the wellhead of the new well, as well as the pressure-increasing and external transmission of natural gas at the wellhead of the old well, effectively avoiding the waste of pressure energy at the wellhead of the new well, reducing the investment in the cost of pressurizing the wellhead of the old well, improving production efficiency, and thus achieving the goal of energy conservation and emission reduction.

[0018] This gas field wellhead pressure energy utilization device utilizes wellhead pressure energy, avoiding the use of compressor equipment that consumes a lot of electricity in traditional methods. It also reduces equipment investment and operating costs, thereby lowering production costs. It improves natural gas extraction efficiency, production efficiency, and fluid transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the movable separation mechanism of the utility model;

[0022] Figure 4 It is a schematic diagram of the working principle of the utility model.

[0023] In the figure: 1. Cylinder body; 2. Movable separation mechanism; 201. Guide column; 202. Separation surface; 203. Through hole; 204. Sealing guide sleeve; 205. Sealing groove; 206. Sealing ring; 3. Chamber A; 4. Chamber B; 5. Exhaust valve; 6. Second high-pressure suction valve; 7. Second low-pressure suction valve; 8. First high-pressure suction valve; 9. First low-pressure suction valve; 10. Infrared ranging sensor; 11. Control system; 12. Touch panel. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a detailed and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0026] Unless otherwise specified, the terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have meanings consistent with the context of their relevant fields and should not be interpreted as idealized or overly formal.

[0027] Example 1

[0028] This embodiment provides a gas field wellhead pressure energy utilization device, such as Figure 1 and Figure 2 As shown, it includes a cylinder body 1 and a control system 11. A movable partition mechanism 2 is provided in the cylinder body 1. The movable partition mechanism 2 and the cylinder body 1 are sealed and connected. The movable partition mechanism 2 divides the cylinder body 1 into a chamber A 3 and a chamber B 4. Both the chamber A 3 and the chamber B 4 are provided with a distance sensor and an exhaust valve 5. The chamber A 3 is provided with a first high-pressure suction valve 8 and a first low-pressure suction valve 9, and the chamber B 4 is provided with a second high-pressure suction valve 6 and a second low-pressure suction valve 7.

[0029] The distance sensor, the exhaust valve 5, the first high-pressure suction valve 8, the first low-pressure suction valve 9, the second high-pressure suction valve 6 and the second low-pressure suction valve 7 are all electrically connected to the control system 11. The control system 11 is used to monitor the data of the distance sensor in real time. When the set value is reached, the exhaust valve 5, the first high-pressure suction valve 8, the first low-pressure suction valve 9, the second high-pressure suction valve 6 and the second low-pressure suction valve 7 are opened or closed.

[0030] This gas field wellhead pressure energy utilization device utilizes wellhead pressure energy, avoiding the use of compressor equipment that consumes a lot of electricity in traditional methods. It also reduces equipment investment and operating costs, thereby lowering production costs. It improves natural gas extraction efficiency, production efficiency, and fluid transportation efficiency.

[0031] Example 2

[0032] Based on Example 1, this example provides a gas field wellhead pressure energy utilization device, such as Figure 3 As shown, the movable separation mechanism 2 includes a separation surface 202 and a guide column 201. The separation surface 202 and the cylinder body 1 have the same longitudinal cross-sectional shape. The guide column 201 passes through the through hole 203 of the separation surface 202 and the two are slidably connected. A sealing guide sleeve 204 is provided between the guide column 201 and the separation surface 202. The sealing guide sleeve 204 is provided in the through hole 203. Two guide columns 201 are symmetrically provided and both are perpendicular to the separation surface 202. Both ends of the guide column 201 are connected to the inner wall of the cylinder body 1.

[0033] Working principle and process:

[0034] like Figure 4 As shown, the first high-pressure suction valve 8 and the second high-pressure suction valve 6 are both connected to the gas production port of the new well site, and the first low-pressure suction valve 9 and the second low-pressure suction valve 7 are both connected to the gas production port of the old well site.

[0035] After starting work, the control system 11 sends a signal to control the first low-pressure suction valve 9 to open, and the gas-liquid two-phase medium in the old well enters chamber A 3 at the initial pressure, serving as a low-pressure area. The initial pressure is used to push the dividing surface 202 to move. When the dividing surface 202 runs to the maximum volume of chamber A 3, the control system 11 closes the first low-pressure suction valve 9 and opens the second high-pressure suction valve 6 of chamber B 4. The gas-liquid two-phase medium of the new well enters chamber B 4 at the initial pressure, serving as a high-pressure area.

[0036] After the gas-liquid two-phase medium (high-pressure medium) from the new well enters, it pushes the dividing surface 202 to move, thereby compressing the gas-liquid two-phase medium (low-pressure medium) in the old well of chamber A 3. During this process, the distance sensor of chamber B 4 detects the movement distance of the dividing surface 202 in real time. When the pressure corresponding to the movement distance reaches the set external output pressure of the low-pressure medium, the internal compression process ends; after the compression is completed, the control system 11 controls the discharge valve of chamber A 3 (low-pressure area) to open, and the pressurized medium is discharged from the cylinder body 1 at a constant pressure, thereby achieving the purpose of pressurized external output; thereafter, the control system 11 controls the discharge valve of chamber B 4 (high-pressure area) to open, and the movement direction of the dividing surface 202 is reversed, so that the high-pressure medium begins to be depressurized and output, and is discharged from the cylinder body 1 at a constant pressure, thereby achieving the purpose of depressurized external output.

[0037] After the high-pressure medium in chamber B 4 is output, the controller controls the discharge valve to close. At this time, the second low-pressure suction valve 7 of chamber B 4 is opened, and the gas-liquid two-phase medium (low-pressure medium) in the old well enters, and chamber B 4 becomes a low-pressure chamber; the first high-pressure valve of chamber A 3 is opened, and the high-pressure medium in the new well enters. At this time, chamber A 3 is a high-pressure chamber, and the purpose of the next stage of low-pressure chamber pressurization and output, and high-pressure chamber decompression and output begins. At this point, a cycle is completed.

[0038] Example 3

[0039] On the basis of Example 2, this embodiment provides a gas field wellhead pressure energy utilization device, wherein a plurality of sealing grooves 205 are opened on the side of the partition surface 202 , and a sealing ring 206 is provided in each of the plurality of sealing grooves 205 .

[0040] The provision of the sealing groove 205 in the sealing groove 205 can increase the airtightness of the partition surface 202 during operation.

[0041] The distance sensor is an infrared distance sensor 10 , which is installed on the inner wall of the cylinder 1 .

[0042] The control system 11 includes a controller and a touch panel 12 . The controller and the touch panel 12 are electrically connected. The touch panel 12 is disposed on the outer wall of the cylinder 1 .

[0043] The cylinder body 1 is a rectangular parallelepiped or a cylinder.

[0044] In this embodiment, the model of the infrared ranging sensor 10 is LDM301, and the controller is an M68HC16 single-chip microcomputer. The controller is fixedly mounted on the outer surface of the cylinder body 1, and a touch panel 12 is provided on the controller. The infrared ranging sensor 10 can be used to monitor the operation status of the partition surface 202 in real time to avoid overpressure operation of the equipment and prevent safety accidents.

[0045] Due to the size parameters of the cylinder 1 (length, width or radius, the volume V1 of the cylinder 1 is obtained), the initial pressure P of the low-pressure medium 1、 The output pressure P2 is a known quantity, so the compressed volume V2 can be obtained by manual calculation, and then the movement distance of the partition surface 202 can be obtained according to the length, width or radius of the cylinder body 1, and finally input through the touch panel 12.

[0046] The calculation process of the movement stroke of the partition surface 202 is as follows:

[0047] Calculation of travel in low pressure area:

[0048] (1) According to the expansion work calculation formula, the regional volume change ;

[0049] (2) During the work from the high-pressure area to the low-pressure area, the pressure P applied to the piston (partition surface 202) gradually changes, that is, the system expands from (P1, V1) to (P3, V3) by overcoming the gradually changing P3, and finally expands to (P2, V2) by overcoming the external pressure P2, where P2 is the external output pressure;

[0050] (3) Ignoring the temperature change during the process, we can get: ;

[0051] (4) Considering the complicated law of pressure change during volume change, approximate calculation is:

[0052] ;

[0053] At the same time, according to the unchanged volume: , the volume of area B under different external output pressures can be calculated and the stroke range can be determined.

[0054] Among them, P B1 P is the pressure generated in the B chamber 4 when the partition surface 202 moves to the maximum volume of the low-pressure B chamber 4; A1 is the pressure generated by the high-pressure A chamber 3 when the first high-pressure suction valve 8 of the A chamber 3 is opened; P2 is the output pressure of the B chamber 4; V A1 is the pressure P A1 Volume of lower chamber A 3; V B1 is the pressure P B1 Volume of lower B chamber 4; V A2 is the volume of chamber 3 under pressure P2; VB2 is the volume of chamber B 4 at pressure P2.

[0055] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A gas field wellhead pressure energy utilization device, characterized by: It includes a cylinder body and a control system, wherein a movable partition mechanism is provided in the cylinder body, wherein the movable partition mechanism and the cylinder body are sealed and connected, wherein the movable partition mechanism divides the cylinder body into chamber A and chamber B, wherein both chamber A and chamber B are provided with a distance sensor and an exhaust valve, wherein chamber A is provided with a first high-pressure suction valve and a first low-pressure suction valve, and chamber B is provided with a second high-pressure suction valve and a second low-pressure suction valve; The distance sensor, the exhaust valve, the first high-pressure suction valve, the first low-pressure suction valve, the second high-pressure suction valve and the second low-pressure suction valve are all electrically connected to the control system. The control system is used to monitor the data of the distance sensor in real time, and when a set value is reached, the exhaust valve, the first high-pressure suction valve, the first low-pressure suction valve, the second high-pressure suction valve and the second low-pressure suction valve are opened or closed.

2. The gas field wellhead pressure energy utilization device according to claim 1, characterized in that: The movable separation mechanism includes a separation surface and a guide column. The separation surface and the longitudinal cross-section of the cylinder body have the same shape. The guide column passes through the through hole of the separation surface and the two are slidably connected. A sealing guide sleeve is provided between the guide column and the separation surface. The sealing guide sleeve is provided in the through hole. Two guide columns are symmetrically provided and both are perpendicular to the separation surface. Both ends of the guide column are connected to the inner wall of the cylinder body.

3. The gas field wellhead pressure energy utilization device according to claim 2, characterized in that: A plurality of sealing grooves are provided on the side surface of the partition surface, and sealing rings are provided in each of the plurality of sealing grooves.

4. A gas field wellhead pressure energy utilization device according to any one of claims 1 to 3, characterized in that: The distance sensor is an infrared distance measuring sensor, which is installed on the inner wall of the cylinder.

5. A gas field wellhead pressure energy utilization device according to any one of claims 1 to 3, characterized in that: The control system includes a controller and a touch panel, the controller and the touch panel are electrically connected, and the touch panel is arranged on the outer wall of the cylinder body.

6. A gas field wellhead pressure energy utilization device according to any one of claims 1 to 3, characterized in that: The cylinder body is a rectangular parallelepiped or a cylinder.

Images