Wellbore thermal washing device

Abstract

The shaft hot washing device comprises a mounting platform, a heating furnace is fixedly connected to one end of the upper surface of the mounting platform, a control device is fixedly connected to the other end of the upper surface of the mounting platform, and a pressurizing device is fixedly connected to the upper surface of the mounting platform and located between the heating furnace and the control device; an M-shaped crude oil pipe is arranged in the heating furnace, the two ends of the M-shaped crude oil pipe penetrate through and extend out of the outer wall of the heating furnace, one end of the M-shaped crude oil pipe is connected with a first crude oil pipe and a second crude oil pipe simultaneously, and the first crude oil pipe is connected with a hot washing pipe; the hot washing pipe is connected with a first hot washing pipe and a second hot washing pipe, the second crude oil pipe is connected with the input end of a pressurizing device, and the output end of the pressurizing device is connected with the hot washing pipe; residual energy generated after crude oil is heated can be conveyed to a station for self-thermal washing, pipes can be switched, and thermal washing can be conducted on a wellhead casing pipe and a pipeline between the stations; and the use cost is low and controllable.

Description

Technical Field

[0001] The invention relates to the technical field of hot washing, and in particular to a wellbore hot washing device. Background Art

[0002] During the oil and gas production process, as the mining depth increases, the temperature and pressure of the formation will continue to change. When the temperature drops below the wax precipitation point, the paraffin in the crude oil and natural gas will precipitate and adhere to the pipe wall, causing the wellbore to be blocked. Waxing of the oil well will not only reduce the oil flow channel, but also continuously increase the oil flow resistance, reducing the oil well production; and serious waxing of the wellbore will cause the pump to get stuck and the oil well to stop production. Therefore, it is necessary to remove the wax from the wellbore in time to ensure that the wellbore will not be blocked during the oil or gas production process, and to ensure the normal production of the oil well.

[0003] At present, the method adopted for hot washing is to connect the hot washing vehicle to the site and carry out the process. Before the hot washing operation, a hot washing plan must be arranged, and hot washing cannot be carried out at any time. In addition, the hot washing vehicle in the prior art is generally composed of a chassis vehicle and a heating device on the platform. When in use, a group of people are required to operate it and a dedicated person is required to guard it, resulting in high cost of hot washing vehicles and traffic risks during the vehicle's journey (it cannot be operated in special weather). At present, the back pressure of some well fields in the operating area is too high, affecting production. There are few wellbore hot washing equipment and the hot washing time is limited to eight hours during the day. The hot washing time is short and the hot washing effect is poor. In addition, the casing pressure of the wellbore is high. As the hot washing time increases, the casing pressure gradually increases, making hot washing difficult and ineffective. Summary of the invention

[0004] The purpose of the present invention is to provide a wellbore hot washing device, which has the characteristics of low use cost and can perform hot washing at any time.

[0005] The technical solution adopted by the present invention includes an installation platform, a heating furnace is fixedly connected to one end of the upper surface of the installation platform, a control device is fixedly connected to the other end of the upper surface of the installation platform, and a pressurizing device is fixedly connected to the upper surface of the installation platform and located between the heating furnace and the control device; an M-type crude oil pipe is arranged inside the heating furnace, and the two ends of the M-type crude oil pipe respectively penetrate and extend out of the outer wall of the heating furnace, one end of the M-type crude oil pipe is simultaneously connected to the first crude oil pipe and the second crude oil pipe, and the first crude oil pipe is connected to the hot washing pipe; the hot washing pipe is connected to the first hot washing pipe and the second hot washing pipe, the second crude oil pipe is connected to the input end of the pressurizing device, and the output end of the pressurizing device is connected to the hot washing pipe.

[0006] The present invention is also characterized in that:

[0007] The heating furnace is connected with a gas pipe, the output end of the first heat-washing pipe is connected with a wellhead casing, and the output end of the second heat-washing pipe is connected with a station room.

[0008] The control device comprises a frequency conversion control cabinet and a PLC control cabinet, and the frequency conversion control cabinet is wirelessly connected to the PLC control cabinet.

[0009] The pressurizing device comprises a gear pump and an explosion-proof motor for the pump, the output end of the explosion-proof motor for the pump is connected to the gear pump, and the frequency conversion control cabinet is wirelessly connected to the explosion-proof motor for the pump.

[0010] A crude oil filter is provided on the second crude oil pipe, and the crude oil filter is located at the front end of the input end of the pressurizing device.

[0011] The two ends of the M-type crude oil pipe outside the heating furnace are connected by a third crude oil pipe.

[0012] A gas pressure regulating valve, a gas control valve and a flame arrester are installed in sequence on the gas pipe along the gas output direction; the first crude oil pipe is provided with a first pipe control valve, the second crude oil pipe is provided with a second pipe control valve, the first hot washing pipe is provided with a third pipe control valve, and the second hot washing pipe is provided with a fourth pipe control valve; a pump outlet control valve is provided at the output end of the pressurizing device, an output control valve is provided at the front section of the port of the M-type crude oil pipe connected to the first crude oil pipe, an input control valve is provided at the front section of the other port of the M-type crude oil pipe, and an external wiring control valve is installed on the third crude oil pipe.

[0013] The gas pressure regulating valve, gas control valve, first pipe control valve, second pipe control valve, third pipe control valve, fourth pipe control valve, pump outlet control valve, flame arrester, input control valve, output control valve and external wiring control valve are all wirelessly connected to the PLC control cabinet.

[0014] The beneficial effects of the present invention are as follows: a plurality of pipes are arranged to form a pipe system, and the plurality of pipes are respectively connected to the wellhead, the wellhead casing, the station and other positions, and the conveying path of the pipeline can be automatically switched by a control device to realize the self-heating washing process after the crude oil is heated, the heat washing process of the casing by returning to the wellhead casing, and the heat washing process of conveying to the station; the crude oil is pressurized by a pressurizing device after being heated and then conveyed to the station, which can effectively reduce the high back pressure problem of the oil pipeline from the well site to the station; the chassis vehicle structure of the traditional hot washing vehicle is eliminated, and the installation platform is moved by a crane on site, which can utilize on-site resources and reduce material costs; automatic control is realized by a control device, which can reduce labor costs. The present invention can utilize the residual energy after the crude oil is heated to convey it to the station for self-heating washing, and can switch pipes to respectively heat wash the wellhead casing and the station pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the wellbore hot washing equipment of the present invention;

[0016] Figure 2 This is a schematic diagram of a first working process of an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the second working process of the embodiment of the present invention;

[0018] Figure 4 Schematic diagram of workflow three of embodiment of the present invention.

[0019] In the figure, 100. installation platform, 200. heating furnace, 300 pressurizing device, 310 gear pump, 320. pump explosion-proof motor, 400 control device, 410. frequency conversion control cabinet, 420. PLC control cabinet, 510. gas pipe, 511. gas pressure regulating valve, 512. flame arrester, 513. gas control valve, 520. M-type crude oil pipe, 521. first crude oil pipe, 522. second crude oil pipe, 523. third crude oil pipe, 524. input control valve, 525. output control valve, 526. external wiring control valve, 530. hot washing pipe, 531. first hot washing pipe, 532. second hot washing branch pipe, 700. crude oil filter, 601. first pipe control valve, 602. second pipe control valve, 603. third pipe control valve, 604. fourth pipe control valve, 605. pump outlet control valve, 1. station room, 2. wellhead casing. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The present invention provides a wellbore hot washing device, such as Figure 1 The figure shows a mounting platform 100, wherein a heating furnace 200 is fixedly connected to one end of the upper surface of the mounting platform 100, a control device 400 is fixedly connected to the other end of the upper surface of the mounting platform 100, and a pressurizing device 300 is fixedly connected to the upper surface of the mounting platform 100 and located between the heating furnace 200 and the control device 400; an M-shaped crude oil pipe 520 is arranged inside the heating furnace 200, and both ends of the M-shaped crude oil pipe 520 respectively penetrate and extend out of the outer wall of the heating furnace 200, and one end of the M-shaped crude oil pipe 520 is simultaneously connected to a first crude oil pipe 521 and a second crude oil pipe 522, and the first crude oil pipe 521 is connected to a hot washing pipe 530; the hot washing pipe 530 is connected to a first hot washing pipe 531 and a second hot washing pipe 532, and the second crude oil pipe 522 is connected to an input end of the pressurizing device 300, and an output end of the pressurizing device 300 is connected to the hot washing pipe 530.

[0022] The heating furnace 200 is connected to the gas pipe 510, the output end of the first heat washing pipe 531 is connected to the wellhead casing 2, and the output end of the second heat washing pipe 53) is connected to the station room 1.

[0023] The control device 400 includes a frequency conversion control cabinet 410 and a PLC control cabinet 420 , and the frequency conversion control cabinet 410 is wirelessly connected to the PLC control cabinet 420 .

[0024] The pressurizing device 300 includes a gear pump 310 and a pump explosion-proof motor 320 . The output end of the pump explosion-proof motor 320 is connected to the gear pump 310 , and the frequency conversion control cabinet 410 is wirelessly connected to the pump explosion-proof motor 320 .

[0025] A crude oil filter 700 is disposed on the second crude oil pipe 522 . The crude oil filter 700 is located at the front end of the input end of the pressurizing device 300 .

[0026] The two ends of the M-type crude oil pipe 520 outside the heating furnace 200 are connected by a third crude oil pipe 523 .

[0027] A gas pressure regulating valve 511, a gas control valve 513 and a flame arrester 512 are sequentially installed on the gas pipe 510 along the gas output direction; the first crude oil pipe 521 is provided with a first pipe control valve 601, the second crude oil pipe 522 is provided with a second pipe control valve 602, the first hot wash pipe 531 is provided with a third pipe control valve 603, and the second hot wash pipe 532 is provided with a fourth pipe control valve 604; a pump outlet control valve 605 is provided at the output end of the pressurizing device 300, an output control valve 525 is provided at the front section of the port of the M-type crude oil pipe 520 connected to the first crude oil pipe 521, an input control valve 524 is provided at the front section of the other port of the M-type crude oil pipe 520, and an external wiring control valve 526 is installed on the third crude oil pipe 523.

[0028] The gas pressure regulating valve 511, the gas control valve 513, the first pipe control valve 601, the second pipe control valve 602, the third pipe control valve 603, the fourth pipe control valve 604, the pump outlet control valve 605, the flame arrester 512, the input control valve 524, the output control valve 525 and the external wiring control valve 526 are all wirelessly connected to the PLC control cabinet 420.

[0029] One end of the gas pipe 510 is connected to the inside of the heating furnace 200, and the other end of the gas pipe 510 is connected to the natural gas tank. A gas pressure regulating valve 511 is provided on the gas pipe 510. The gas is transported to the heating furnace 200 through the gas pipe 510 for ignition and heating. The gas pressure regulating valve 511 can adjust the gas pressure, thereby adjusting the heating temperature of the heating furnace 200. The pressure regulating valve 511 can adjust the pressure according to the ambient temperature or the degree of wax deposition in the pipe. One end of the M-type crude oil pipe 520 is connected to the wellhead, and the other end of the M-type crude oil pipe 520 passes through the heating furnace 200 and is connected to the first crude oil pipe 521 and the second crude oil pipe 522 at the same time. The first crude oil pipe 521 is connected to the hot wash pipe 530, and the second crude oil pipe 522 is connected to the input end of the pressurizing device 300. The output end of the pressurizing device 300 is connected to the hot wash pipe 530. It is connected with the hot washing pipe 530, that is, the crude oil can be divided into two hot washing paths through the first crude oil pipe 521 and the second crude oil pipe 522, which play different roles respectively. For example, path one: the wellhead crude oil is transported to the heating furnace 200 for heating and then connected to the hot washing pipe 530 at the rear end through the first crude oil pipe 521. The residual energy of the crude oil after heating can be used to transport it to the station 1 through the pipe (self-heating process), which can reduce the back pressure in the pipeline and can also continuously hot wash the pipeline; path two: the wellhead crude oil is transported to the heating furnace 200 for heating and then transported to the pressurizing device 300 through the second crude oil pipe 522 for pressurization, and then connected to the hot washing pipe 530 at the rear end. After pressurization, it enters the station 1 through the pipe, which can continuously hot wash the pipe from the well site to the station to reduce the impact of high back pressure caused by wax deposition on the oil well production.

[0030] The hot washing pipe 530 is divided into a first hot washing pipe 531 and a second hot washing pipe 532. The first hot washing pipe 531 is connected to the wellhead casing, and the second hot washing pipe 532 is connected to the station. By dividing the hot washing pipe 530 into the first hot washing pipe 531 and the second hot washing pipe 532 at a certain position, and connecting them to the wellhead casing 2 and the station 1 respectively, the wellhead casing 2 can be hot washed through the first hot washing pipe 531, and the pipe of the station 1 can be hot washed through the second hot washing pipe 532. It should be noted that the wellhead casing 2 at 300-400 meters underground is generally prone to wax deposition, causing casing blockage, and the pressure is generally high. As the hot washing time increases, the casing pressure gradually increases, and the hot washing is difficult and the effect is low. Therefore, after the crude oil is pressurized, the wellhead casing 2 can be hot washed through the first hot washing pipe 531. Pressurization can avoid high casing back pressure and difficulty in cleaning; the conveying pipe from the wellhead to the station 1 can be hot washed through the second hot washing pipe 532.

[0031] A first pipe control valve 601 is provided on the first crude oil pipe 521, a second pipe control valve 602 is provided on the second crude oil pipe 522, a third pipe control valve 603 is provided on the first hot wash pipe 531, and a pipe control valve 604 is provided on the second hot wash pipe 532. A pump outlet control valve 605 is provided on the pipe whose output end of the pressurizing device 300 is connected to the hot wash pipe 530; these control valves are wirelessly connected to the control device 400 respectively, and the control device 400 includes a frequency conversion control cabinet 410 and a PLC control cabinet 420. The frequency conversion control cabinet 410 is wirelessly connected to the pressurizing device 300, and the PLC control cabinet 420 is connected to the gas pressure regulating valve 511 and each pipe control valve. The PLC control cabinet 420 is used to automatically control each pipe control valve, and can control the on and off of each pipe, so as to switch the pipe; the pressurizing device 300 is controlled by the frequency conversion control cabinet 410, and the working frequency of the pressurizing device 300 can be adjusted, and it is adjusted according to the actual pressure of the pipeline, which can reduce energy loss.

[0032] The second crude oil pipe 522 is provided with a crude oil filter 700, which is arranged at the front end of the pressurizing device 300. By providing the crude oil filter 700, the crude oil can be filtered for residue before being transported to the pressurizing device 300 for pressurization, thereby preventing the residue in the crude oil from clogging and damaging the pressurizing device 300.

[0033] The PLC control cabinet 420 includes a communication module, and the PLC control cabinet 420 is connected to external devices through the communication module, such as being connected to a mobile phone or a computer terminal, so that the staff can remotely monitor the hot washing of the pipe and observe the working status of the equipment in real time, while the traditional hot washing vehicle requires the staff to perform on-site control and can only perform hot washing during the day, and the hot washing time is short. Compared with the hot washing vehicle, the present invention has a longer service life (a single well can be hot washed for 12-24 hours if time permits).

[0034] Example 1

[0035] In the wellbore hot washing device of the present invention, the pressurizing device 300 includes a high temperature resistant gear pump 310 and a pump explosion-proof motor 320. The high temperature resistant gear pump 310 is connected to the pump explosion-proof motor 320. The pump explosion-proof motor 320 is used to drive the high temperature resistant gear pump 310 to work. The pump explosion-proof motor 320 is wirelessly connected to the frequency conversion control cabinet 410. The working frequency of the pump explosion-proof motor 320 is adjusted by the frequency conversion control cabinet 410, thereby adjusting the pressurization pressure; after the actual test of the pump, the high temperature resistant gear pump 310 is used for pressurization. During the test, a centrifugal pump is used for actual operation and it is found that it cannot offset the pipe back pressure. The high temperature resistant gear pump is preferably a 2CY gear oil pump, which is suitable for conveying non-solid particles and fibers and is non-corrosive. The 2CY gear pump is used for temperatures not higher than 80°C and has a viscosity of 5*10 -6 m 2 / s~1.5*10-3 m 2 / s (5-1500cSt) lubricating oil or other liquids with similar properties to lubricating oil and used in hydraulic rotation systems.

[0036] Example 2

[0037] In the wellbore hot washing device of the present invention, an M-type crude oil pipe 520 is provided with an input control valve 524 at the input port of the heating furnace 200, and an output control valve 525 is provided at the output port of the heating furnace 200; the input end of the input control valve 524 and the output end of the output control valve 525 are connected through a third crude oil pipe 523, and an external wiring control valve 526 is provided on the third crude oil pipe 523; by providing the input control valve 524, the output control valve 525 and the third crude oil pipe 523, and the input control valve 524 and the output control valve 525 are respectively connected to the PLC control cabinet 420, and the opening and closing thereof are controlled by the control cabinet, the switching of the wellhead crude oil delivery pipe can be realized, that is, when the input control valve 524 and the output control valve 525 are closed, and the external wiring control valve 526 is opened, the wellhead crude oil does not enter the heating furnace 200 for heating, but is directly transported from the third crude oil pipe 523 to the rear end pipe, and the pipe design can be used to switch the pipe according to actual needs.

[0038] Example 3

[0039] In the wellbore hot washing device of the present invention, a gas control valve 513 is further provided on the gas pipe 510, and the gas control valve 513 is electrically connected to the PLC control valve. The on-off of the gas pipe 510 is controlled by the gas control valve 513, thereby controlling the heating start and close of the heating furnace 200; a flame arrester 512 is also provided on the gas pipe 510, and the flame arrester 512 is electrically connected to the PLC control valve. By setting the flame arrester 512, ignition of flammable gas can be avoided, and the gas flame will spread to the entire pipe network; the above-mentioned installation platform 100 is provided with a crane bracket, and the crane can suspend and move the installation platform 100 through the crane bracket, utilizing on-site resources, eliminating the chassis structure of the traditional hot washing vehicle, and reducing costs.

[0040] Example 4

[0041] The wellbore hot washing device of the present invention comprises a mounting platform 100, a heating furnace 200 is fixedly connected to one end of the upper surface of the mounting platform 100, a control device 400 is fixedly connected to the other end of the upper surface of the mounting platform 100, and a pressurizing device 300 is fixedly connected to the upper surface of the mounting platform 100 and located between the heating furnace 200 and the control device 400; an M-shaped crude oil pipe 520 is arranged inside the heating furnace 200, and the two ends of the M-shaped crude oil pipe 520 respectively penetrate and extend out of the outer wall of the heating furnace 200, and the M-shaped crude oil pipe 520 One end is connected to the first crude oil pipe 521 and the second crude oil pipe 522 at the same time, the first crude oil pipe 521 is connected to the hot washing pipe 530; the hot washing pipe 530 is connected to the first hot washing pipe 531 and the second hot washing pipe 532, the second crude oil pipe 522 is connected to the input end of the pressurizing device 300, the output end of the pressurizing device 300 is connected to the hot washing pipe 530, the heating furnace 200 is connected to the gas pipe 510, the output end of the first hot washing pipe 531 is connected to the wellhead casing 2, and the output end of the second hot washing pipe 53) is connected to the station room 1.

[0042] Three work processes of Examples 1 to 4 of the present application:

[0043] Process 1: Figure 2 After the wellhead crude oil passes through the M-type crude oil pipe 520 to the heating furnace 200 for heating, the residual energy is used to transport it to the station through the first crude oil pipe 521 and the second hot washing pipe 532 in sequence (self-heating process), which can reduce the back pressure in the pipeline and continuously hot wash the pipeline.

[0044] Process 2: Figure 3 The wellhead crude oil passes through the M-type crude oil pipe 520 to the heating furnace 200 for heating, is filtered by the filter 700, is pressurized by the pressurizing device 300, and then passes through the second crude oil pipe 522 and the second hot washing pipe 532 in sequence to enter the inter-station process. The pipes from the well site to the station can be continuously hot-washed to reduce the impact of high back pressure caused by wax deposition on the oil well production.

[0045] Process 3: Figure 4 The wellhead crude oil passes through the M-type crude oil pipe 520 to the heating furnace 200 for heating, is filtered by the filter 700, is pressurized by the pressurizing device 300, flows into the first hot washing pipe 531 through the second crude oil pipe 522, and enters the wellhead oil casing annular space to perform continuous and effective hot washing on the wellbore, so as to reduce the impact of wax deposition on the well production.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wellbore hot washing device, characterized in that: The invention comprises a mounting platform (100), wherein a heating furnace (200) is fixedly connected to one end of the upper surface of the mounting platform (100), a control device (400) is fixedly connected to the other end of the upper surface of the mounting platform (100), and a pressurizing device (300) is fixedly connected to the upper surface of the mounting platform (100) and located between the heating furnace (200) and the control device (400); an M-shaped crude oil pipe (520) is arranged inside the heating furnace (200), and the two ends of the M-shaped crude oil pipe (520) respectively penetrate The M-shaped crude oil pipe (520) extends out of the outer wall of the heating furnace (200); one end of the M-shaped crude oil pipe (520) is simultaneously connected to a first crude oil pipe (521) and a second crude oil pipe (522); the first crude oil pipe (521) is connected to a hot washing pipe (530); the hot washing pipe (530) is connected to a first hot washing pipe (531) and a second hot washing pipe (532); the second crude oil pipe (522) is connected to an input end of a pressurizing device (300); and an output end of the pressurizing device (300) is connected to the hot washing pipe (530).

2. The wellbore hot washing device according to claim 1, characterized in that: The heating furnace (200) is connected to a gas pipe (510), the output end of the first heat-washing pipe (531) is connected to a wellhead casing (2), and the output end of the second heat-washing pipe (532) is connected to a station room (1).

3. The wellbore hot washing device according to claim 1, characterized in that: The control device (400) comprises a frequency conversion control cabinet (410) and a PLC control cabinet (420), and the frequency conversion control cabinet (410) is wirelessly connected to the PLC control cabinet (420).

4. The wellbore hot washing device according to claim 3, characterized in that: The pressurizing device (300) comprises a gear pump (310) and a pump explosion-proof motor (320), the output end of the pump explosion-proof motor (320) is connected to the gear pump (310), and the frequency conversion control cabinet (410) is wirelessly connected to the pump explosion-proof motor (320).

5. The wellbore hot washing device according to claim 1, characterized in that: The second crude oil pipe (522) is provided with a crude oil filter (700), and the crude oil filter (700) is located at the front end of the input end of the pressurizing device (300).

6. The wellbore hot washing device according to claim 2, characterized in that: The two ends of the M-shaped crude oil pipe (520) outside the heating furnace (200) are connected via a third crude oil pipe (523).

7. The wellbore hot washing device according to claim 6, characterized in that: A gas pressure regulating valve (511), a gas control valve (513) and a flame arrester (512) are sequentially installed on the gas pipe (510) along the gas output direction; the first crude oil pipe (521) is provided with a first pipe control valve (601), the second crude oil pipe (522) is provided with a second pipe control valve (602), the first heat-washing pipe (531) is provided with a third pipe control valve (603), and the second heat-washing pipe (532) is provided with a fourth pipe control valve (604); a pump outlet control valve (605) is provided at the output end of the pressurizing device (300), an output control valve (525) is provided at the front section of the port of the M-type crude oil pipe (520) connected to the first crude oil pipe (521), an input control valve (524) is provided at the front section of another port of the M-type crude oil pipe (520), and an external wiring control valve (526) is installed on the third crude oil pipe (523).

8. The wellbore hot washing device according to claim 7, characterized in that: The gas pressure regulating valve (511), the gas control valve (513), the first pipe control valve (601), the second pipe control valve (602), the third pipe control valve (603), the fourth pipe control valve (604), the pump outlet control valve (605), the flame arrester (512), the input control valve (524), the output control valve (525) and the external wiring control valve (526) are all wirelessly connected to the PLC control cabinet (420).

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