A pig tee pipeline automatic steering device

Abstract

The present application relates to a kind of pig three-way pipe automatic steering device, pig includes detection component, pig component, detection component rear end is rotatably connected with the front end of pig component;Two axis-symmetric fluid passages are opened in the detection component and pig component, respectively, and the rear end of detection component and pig component is equipped with the screw electromagnetic valve of control the opening and closure of the fluid passage, so that the force difference of the left and right sides of detection component and pig component is generated to drive device to complete steering movement;Adjusting device outer diameter size telescopic component is equipped in the periphery of detection component and the periphery of pig component.The present application controls the opening and closure of the fluid passage of the left and right sides of detection component and pig component by screw electromagnetic valve, so that the force difference of the left and right sides of detection component and pig component is generated to drive device to complete steering movement, it is simple to operate, and degree of automation is high, reduce the workload of staff and the time of completing pigging operation, improve the efficiency of pigging operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas transportation, and particularly relates to an automatic steering device for a pig used for cleaning a pipeline at a three-way pipeline. BACKGROUND

[0002] Long-distance transportation of oil and gas is usually completed by using a pipeline, and in the process of transportation, impurities contained in oil and gas can easily cause pipeline blockage and even serious corrosion of the inner wall of the pipeline, which affects normal use and transportation of the pipeline and even causes safety accidents. Therefore, a pig is often used to clean and detect the inside of the pipeline, but due to the long and complex pipeline line of oil and gas, the pig often encounters a situation that the main pipeline and the branch pipeline change direction.

[0003] In the prior art, the function of path selection of the pig at the three-way pipeline in the oil and gas pipeline is mainly realized by relying on a tracer to track the real-time position of the pig, and by measuring the time when the pig reaches the next station through the running speed or by subjectively judging whether the pig passes through a certain pipe section, the specific position or the progress of the pig at a certain pipe section is determined, and when the device is about to reach the next station of the pipeline, the staff manually opens a branch pipe valve on one side of the three-way pipeline of the oil and gas pipeline at the next station to be passed through, so that the pig passes through the valve and opens one side.

[0004] The above operation of steering the pig at the three-way pipeline has a large amount of work, consumes a long time, has potential risks when the positioning accuracy or the measurement is wrong, and has low efficiency. SUMMARY

[0005] The technical problem to be solved by the present application is that in order to overcome the shortcomings in the prior art, the present application provides an automatic steering device for a pig at a three-way pipeline, which realizes automatic steering of the pig at the three-way pipeline in the oil and gas pipeline through the pressure difference generated by the fluid in the pipeline on the pig.

[0006] The technical scheme adopted by the present application to solve the technical problem is an automatic steering device for a pig at a three-way pipeline, wherein the pig comprises a detection assembly and a pigging assembly, and the rear end of the detection assembly is rotationally connected to the front end of the pigging assembly.

[0007] Two axisymmetric fluid channels are formed in the detection assembly and the pigging assembly, and a screw electromagnetic valve for controlling the opening and closing of the fluid channels is installed at the rear end of each of the detection assembly and the pigging assembly, so that the screw electromagnetic valve controls the opening and closing of the fluid channels, and the force difference on the left and right sides of the detection assembly and the pigging assembly drives the device to complete steering movement.

[0008] A telescopic assembly is arranged at the periphery of the detection assembly and the periphery of the pigging assembly, and the telescopic assembly adjusts the outer diameter according to the change in the pipeline.

[0009] The telescopic assembly comprises a variable-diameter shell, and an inner wall of the variable-diameter shell is connected with an outer wall of the detection assembly and an outer wall of the pigging assembly respectively, and a telescopic rod is arranged between the inner wall of the variable-diameter shell and the outer wall of the detection assembly and the outer wall of the pigging assembly, so as to drive the variable-diameter shell to expand or retract along the radial direction of the pipeline.

[0010] Specifically, a first connecting rod is fixed to a rear end of the detection assembly, a second connecting rod is fixed to a front end of the pigging assembly, and the rear end of the first connecting rod and the front end of the second connecting rod are rotationally connected through a rotating shaft.

[0011] Preferably, the screw electromagnetic valve comprises a valve body, the valve body is arranged at an intermediate position between the rear ends of the detection assembly and the pigging assembly, a pair of valves are arranged at an upper end of the valve body, and the valves are respectively moved to the left and right sides to close or open the fluid passage.

[0012] Further, the telescopic assembly has a sleeve, the sleeve is fixed to the outer walls of the detection assembly and the pigging assembly, the telescopic rod comprises a fixed section and a connecting section which has a smaller diameter than the fixed section, the outer end of the fixed section is fixed to the inner wall of the variable-diameter shell, the inner end of the connecting section extends into the sleeve, a spring is sleeved on the connecting section, one end of the spring abuts against a stepped surface between the fixed section and the connecting section, and the other end of the spring abuts against a stepped surface arranged in the sleeve.

[0013] The present application has the following beneficial effects: the opening and closing control of the fluid passage on the left and right sides of the detection assembly and the pigging assembly by the screw electromagnetic valve causes a force difference on the left and right sides of the detection assembly and the pigging assembly, so as to drive the device to complete the turning motion, realize the automatic selection of the path of the device at the tee pipeline in the oil and gas pipeline, and improve the efficiency of the pigging operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in combination with the drawings and examples.

[0015] Fig. 1 is a structural schematic view of the present application.

[0016] Fig. 2 is an installation schematic view of the screw electromagnetic valve of the present application on the pigging assembly.

[0017] Fig. 3 is a structural schematic view of the telescopic assembly of the present application.

[0018] Fig. 4 is a structural schematic view of the telescopic rod of the present application.

[0019] Figure: 1. Detection assembly, 2. Pigging assembly, 3. First connecting rod, 4. Second connecting rod, 5. Pivot, 6. Telescopic assembly, 6-1. Reducing shell, 6-2. Sleeve, 6-3. Telescopic rod, 6-4. Spring, 7. Fluid channel, 8. Screw electromagnetic valve, 8-1. Valve body, 8-2. Valve. DETAILED DESCRIPTION

[0020] The application will now be described in further detail with reference to the drawings. These drawings are simplified schematic illustrations of the basic structure of the application and therefore only show the components relevant to the application.

[0021] As Figs. 1-4 shown in a pigging tee pipeline automatic steering device, the pigging device includes a detection assembly 1 and a pigging assembly 2, the detection assembly 1 is fixedly connected with a first connecting rod 3 at the rear end, the pigging assembly 2 is fixedly connected with a second connecting rod 4 at the front end, the rear end of the first connecting rod 3 and the front end of the second connecting rod 4 are rotationally connected through a pivot 5. During use, if the angle of the tee pipeline is too large to cause the device to be difficult to steer through as a whole, at this time the detection assembly 1 at the front end passes first, the pivot 5 automatically rotates by a corresponding angle, the pigging assembly 2 is driven to pass through by the second connecting rod 4, and enters the next pipe section.

[0022] A telescopic assembly 6 is arranged at the periphery of the detection assembly 1 and the periphery of the pigging assembly 2, the telescopic assembly 6 adjusts the outer diameter according to the change in the pipeline to adapt to the change in the diameter of the pipeline.

[0023] A fluid channel 7 is opened on the left and right sides of the detection assembly 1 and the pigging assembly 2 in the axial movement direction of the pipeline, the fluid channel 7 is a through hole structure that is open in front and back, a screw electromagnetic valve 8 that controls the opening and closing of the fluid channel 7 is installed at the rear end of the detection assembly 1 and the pigging assembly 2, the screw electromagnetic valve 8 includes a valve body 8-1, the valve body 8-1 is installed at the intermediate position of the rear end of the detection assembly 1 and the pigging assembly 2, a pair of valves 8-2 are arranged at the upper end of the valve body 8-1, the fluid channel 7 is slotted on the side close to the screw electromagnetic valve 8 for inserting the valves 8-2; the fluid channel 7 is closed when the valves 8-2 move to close and is opened when the valves 8-2 move to open through the opening and closing control of the screw electromagnetic valve 8 on the fluid channel 7. In the working environment without steering, the fluid channel 7 remains in an open state to allow the fluid to flow freely, when the tee pipeline needs to be steered, the detection assembly 1 and the pigging assembly 2 on the left and right sides are subjected to a force difference by cooperating with the screw electromagnetic valve 8 to complete the steering movement.

[0024] When the device starts to work, the four valves 8-2 of the detection assembly 1 and the pigging assembly 2 are in the open state, and the fluid in the oil and gas pipeline can pass through the fluid passage 7 normally. The preset path of the PLC control unit is configured, and when the device runs to the position where the three-way pipeline needs to be turned, the same single-side valve 8-2 of the detection assembly 1 and the pigging assembly 2 is closed, and the other valve 8-2 is opened, so that the force area of the bottom of the opposite direction of the movement direction between the detection assembly 1 and the pigging assembly 2 is changed, the fluid generates a thrust difference on both sides of the device, and the device is turned to the side where the valve 8-2 is opened.

[0025] If the device needs to continue to run to the left to complete the work at a certain three-way pipeline, the two spiral electromagnetic valves 8 are configured to close the right valve 8-2 and keep the left valve 8-2 open at the same time, so that the right fluid passage 7 is closed and the left fluid passage 7 remains open. At this time, the fluid in the oil and gas pipeline continues to flow from the left fluid passage 7, and the fluid in the right fluid passage 7 cannot pass through. The force area of the fluid is larger, and the fluid applies a larger thrust to the right side of the bottom of the opposite direction of the movement direction of the detection assembly 1 and the pigging assembly 2. As a result, a force difference is formed on the left and right sides of the bottom of the detection assembly 1 and the pigging assembly 2. When the front end of the device running direction contacts the inner wall of the pipeline, the larger thrust on the right side will make the device deviate to the left, so that the device enters the next pipeline section to continue to complete the work under the cooperation of the telescopic assembly 6. If the device needs to continue to run to the right to complete the work, the left valve 8-2 is closed and the right valve 8-2 is opened, so that the left fluid passage 7 is closed and the right fluid passage 7 remains open. The fluid applies a larger thrust to the left side of the bottom of the opposite direction of the movement direction of the detection assembly 1 and the pigging assembly 2, and the device deviates to the right.

[0026] The telescopic assembly 6 includes a variable-diameter shell 6-1, a sleeve 6-2, a telescopic rod 6-3 and a spring 6-4. The sleeve 6-2 is fixedly connected with the outer wall of the detection assembly 1 and the pigging assembly 2. The telescopic rod 6-3 includes a fixed section and a connecting section with a smaller diameter than the fixed section, the outer end of the fixed section is fixedly connected with the inner wall of the variable-diameter shell 6-1, the inner end of the connecting section extends into the sleeve 6-2, and the spring 6-4 is sleeved on the connecting section. One end of the spring 6-4 abuts against the stepped surface between the fixed section and the connecting section of the telescopic rod 6-3, and the other end of the spring 6-4 abuts against the stepped surface arranged in the sleeve 6-2.

[0027] The telescopic rod 6-3 is in an extended state when entering the main pipeline, so that the variable-diameter shell 6-1 is attached to the inner wall of the pipeline; when the device enters the branch pipeline, if the pipe diameter becomes smaller, the wall of the small pipe diameter exerts pressure on the outer wall of the variable-diameter shell 6-1, the telescopic rod 6-3 is compressed into the sleeve 6-2, and the stepped surface between the fixed section and the connecting section compresses the spring 6-4, so that the device as a whole can adapt to the inner diameter of the pipeline and continue to work; when the device returns to the main pipeline with a larger diameter, under the restoring force of the spring 6-4, the telescopic rod 6-3 is opened outward, and the variable-diameter shell 6-1 is pushed to attach to the pipeline to continue running.

[0028] The present application utilizes the principle of pressure difference generated by the fluid in the oil and gas pipeline on the pig, and is matched with the rotary connection mode of the first connecting rod 3 and the second connecting rod 4, so that the in-pipe detection and the pigging work are integrated in the same device, and the automatic route searching and turning of the pig in the three-way pipeline of the oil and gas pipeline are realized.

[0029] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A pig tee pipe automatic steering device, the pig comprising a detection assembly, a pig assembly, characterized in that: The detection assembly rear end is rotationally connected with the pig assembly front end. The detection assembly and the pig assembly are both provided with two axisymmetric fluid passages, and the detection assembly and the pig assembly rear end are respectively provided with a screw electromagnetic valve for controlling the opening and closing of the fluid passage. The detection assembly and the pig assembly are both provided with a telescopic assembly, and the telescopic assembly adjusts its outer diameter according to the change in the pipeline. The telescopic assembly comprises a variable-diameter shell, and the variable-diameter shell inner wall is connected with the detection assembly outer wall and the pig assembly outer wall respectively, and the telescopic assembly is provided with a telescopic rod for driving the variable-diameter shell to expand or retract along the pipeline radial direction. The screw electromagnetic valve comprises a valve body, and the valve body is installed in the middle position of the detection assembly and the pig assembly rear end.

2. The pig tee pipe automatic turning device of claim 1, wherein: The detection assembly rear end is fixedly connected with a first connecting rod, and the pig assembly front end is fixedly connected with a second connecting rod.

3. The pig tee pipe automatic turning device of claim 1, wherein: The telescopic assembly is provided with a sleeve, and the sleeve is fixedly connected with the detection assembly and the pig assembly outer wall. The telescopic rod comprises a fixed section and a connecting section in an integrated structure, and the fixed section outer end is fixedly connected with the variable-diameter shell inner wall. The connecting section inner end extends into the sleeve, and the connecting section is provided with a spring. One end of the spring is abutted against the step surface between the fixed section and the connecting section, and the other end of the spring is abutted against the step surface arranged in the sleeve.

Images