Hydraulic control system for a pressurized work device

Abstract

The utility model discloses a kind of hydraulic control systems with pressure operation device, belong to hydraulic control system technical field, comprising: lifting cylinder control circuit, wellhead device control circuit and energy accumulator circuit, the lifting cylinder control circuit, the wellhead device control circuit and the energy accumulator circuit All be provided with at least one detection device for detecting pressure and / or flow in hydraulic pipeline, rotational speed sensor for detecting rotational speed is provided on the hydraulic source, the detection device and the rotational speed sensor are electrically connected with control system respectively, when system fails, according to control system acquisition pressure and / or flow data detected by detection device and rotational speed detected by rotational speed sensor, and the above detection data are compared with calibration data in system, can accurately find fault point, to reduce maintenance personnel workload, quickly restore production.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic control system technology, specifically relating to a hydraulic control system for a live-line working device. Background Technology

[0002] Live workover equipment is used during well workover operations in oilfields to safely and reliably pull out and run the tubing string from and into the well without controlling the well or venting blowouts. This achieves the goals of protecting formation pressure, preventing formation contamination, saving on wastewater treatment costs, avoiding the impact of blowouts on surrounding well production due to reduced formation pressure, mitigating environmental pollution, and maximizing the protection of oil and gas reservoirs. Because the live workover equipment requires controlling the raising and lowering of the lifting cylinders, the switching of multiple blowout preventers, and the clamping and releasing of slips, its hydraulic control system has complex piping. Locating faults is time-consuming and labor-intensive, and delays in locating faults can hinder production. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a hydraulic control system for a live-line working device that can accurately locate fault points, reduce the workload of maintenance personnel, and quickly restore production, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A hydraulic control system for a pressurized working device includes: a lifting cylinder control circuit, a wellhead device control circuit, and an accumulator circuit. Each of the lifting cylinder control circuit, the wellhead device control circuit, and the accumulator circuit is equipped with at least one detection device for detecting pressure and / or flow in the hydraulic pipeline. Both the lifting cylinder control circuit and the wellhead device control circuit include a hydraulic source, and a speed sensor for detecting rotational speed is installed on the hydraulic source. The detection device and the speed sensor are electrically connected to the control system.

[0006] Furthermore, the detection device includes a flow sensor and a pressure sensor, and an electrical contact pressure gauge is connected to the hydraulic pipeline via a branch.

[0007] Furthermore, the rodless chamber of the lifting cylinder is connected to the first electro-hydraulic directional valve and the first hydraulic source via hydraulic lines, and the rod chamber of the lifting cylinder is connected to the second electro-hydraulic directional valve, the one-way sequence valve, and the first electro-hydraulic directional valve via hydraulic lines, forming the lifting cylinder control circuit.

[0008] Furthermore, the return port of the second electro-hydraulic directional valve is connected to the rodless chamber of the lifting cylinder via a hydraulic pipeline.

[0009] Furthermore, the hydraulic cylinder of the wellhead device is connected to the electromagnetic directional valve group, the fourth electro-hydraulic directional valve, the unloading relief valve, the third electro-hydraulic directional valve, and the second hydraulic source via hydraulic pipelines to form the control circuit of the wellhead device.

[0010] Furthermore, the wellhead device includes a moving slip, a fixed slip, an annular blowout preventer, a hydraulic gate valve, a full-seal blowout preventer, and a three-gate blowout preventer. The cylinders of each part of the wellhead device are respectively connected to one of the electromagnetic directional valves in the electromagnetic directional valve group. There are two electromagnetic directional valve groups, and the two electromagnetic directional valve groups are respectively connected to the fourth electro-hydraulic directional valve through a manual pressure regulating valve.

[0011] Furthermore, the third electro-hydraulic directional valve is connected between the first electro-hydraulic directional valve and the first hydraulic source via a hydraulic pipeline.

[0012] Furthermore, the accumulator circuit includes an accumulator, which is connected between the fourth electro-hydraulic directional valve and the unloading relief valve via a hydraulic pipeline.

[0013] Furthermore, the accumulator is connected to the high-pressure ball valve, the triple valve and the solenoid directional valve corresponding to the three-gate blowout preventer via hydraulic pipelines. Together with the hydraulic pipelines connecting the accumulator to the fourth electro-hydraulic directional valve and the unloading relief valve, they form the accumulator circuit.

[0014] Furthermore, the control system also includes an operator's cab cylinder control circuit and a hydraulic winch control circuit. The operator's cab cylinder is connected to a fifth electro-hydraulic directional valve and one of the electromagnetic directional valves in the electromagnetic directional valve group via hydraulic lines, forming the operator's cab cylinder control circuit. The hydraulic winch cylinder is connected to a first manual directional valve and one of the manual pressure regulating valves via hydraulic lines. The first manual directional valve is connected to a second manual directional valve and the lifting cylinder via hydraulic lines, forming the hydraulic winch control circuit.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] In the hydraulic control system of the pressurized operation device disclosed in this utility model, detection devices are installed in the lifting cylinder control circuit, the wellhead device control circuit, and the accumulator circuit. When the system fails, the control system collects the pressure and / or flow data detected by the detection devices and the rotational speed detected by the speed sensor, and compares the above detection data with the calibration data in the system. This can accurately locate the fault point, thereby reducing the workload of maintenance personnel and quickly restoring production.

[0017] In this invention, the second electro-hydraulic directional valve has a differential function. When supplying oil to the rodless chamber of the lifting cylinder, the second electro-hydraulic directional valve switches to the left position, and the hydraulic oil in the rod chamber of the lifting cylinder flows through the return port of the second electro-hydraulic directional valve to the oil supply line of the rodless chamber of the lifting cylinder, thereby accelerating the oil supply to the rodless chamber of the lifting cylinder and thus increasing the lifting speed of the tubing column.

[0018] In this invention, the second hydraulic source normally supplies oil to the blowout preventer control circuit and the accumulator circuit. When the tubing column is lifted, by switching the third electro-hydraulic directional valve, the hydraulic oil pumped out by the second hydraulic source can be supplemented to the control circuit of the lifting cylinder, so that the first hydraulic source and the second hydraulic source work simultaneously to supply oil to the lifting cylinder, which can further improve the lifting speed of the tubing column.

[0019] In this invention, when the engine suddenly shuts down or the control circuit or hydraulic power source malfunctions, the hydraulic oil stored in the accumulator can be used to promptly shut down the relevant blowout preventer and slips, preventing safety accidents from occurring. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the hydraulic control system of the live-line working device of this utility model;

[0021] In the diagram, 10-oil tank, 11-oil filter, 12-first hydraulic power source, 13-relief valve, 14-first electro-hydraulic directional valve, 15-one-way sequence valve, 16-second electro-hydraulic directional valve, 17-lifting cylinder, 21-speed sensor, 22-electric contact pressure gauge, 23-flow sensor, 24-pressure sensor, 31-second hydraulic power source, 32-third electro-hydraulic directional valve, 33-unloading relief valve, 34-fourth electro-hydraulic directional valve, 35-manual pressure regulating valve, 36-solenoid directional valve assembly, 37-hydraulic lock 41-Moving slip, 42-Fixed slip, 43-Annular blowout preventer, 431-Pressure reducing valve, 432-Dedicated accumulator, 44-Hydraulic gate valve, 45-Fully sealed blowout preventer, 46-Three-gate blowout preventer, 461, 462-Semi-sealed gate valve, 463-Safety slip, 50-Check valve, 51-Accumulator, 52-High-pressure ball valve, 53-Triple valve, 61-Fifth electro-hydraulic directional valve, 62-Operator's chamber cylinder, 71-First manual directional valve, 72-Hydraulic winch, 73-Second manual directional valve. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0023] like Figure 1 As shown, a hydraulic control system for a pressurized working device includes: a lifting cylinder control circuit, a wellhead device control circuit, and an accumulator circuit. Each of the lifting cylinder control circuit, the wellhead device control circuit, and the accumulator circuit is equipped with at least one detection device for detecting the pressure and / or flow rate in the hydraulic pipeline. Both the lifting cylinder control circuit and the wellhead device control circuit include a hydraulic source, and a speed sensor 21 for detecting the rotational speed is installed on the hydraulic source. The detection device and the speed sensor 21 are electrically connected to the control system.

[0024] The detection device includes a flow sensor 23 and a pressure sensor 24. An electric contact pressure gauge 22 is connected to the hydraulic pipeline via a branch. The electric contact pressure gauge 22 can monitor the pressure at multiple locations in the control circuit in real time and will issue an alarm when the oil pressure in the pipeline exceeds the set threshold to prevent safety accidents.

[0025] The live-line working device achieves the lifting and lowering of the tubing string from and into the well by driving the lifting cylinder 17. The rodless chamber of the lifting cylinder 17 is connected to the first electro-hydraulic directional valve 14 and the first hydraulic source 12 via hydraulic lines, while the rod chamber of the lifting cylinder 17 is connected to the second electro-hydraulic directional valve 16, the one-way sequence valve 15, and the first electro-hydraulic directional valve 14 via hydraulic lines, forming the lifting cylinder control circuit.

[0026] During the descent of the lifting cylinder 17, the one-way valve of the one-way sequence valve 15 opens. During the ascent of the lifting cylinder 17, when the return oil pressure in the pipeline reaches a certain value, the sequence valve of the one-way sequence valve 15 opens. The opening pressure of the sequence valve in the one-way sequence valve 15 during the ascent of the lifting cylinder 17, i.e., the return oil pressure in the pipeline, can be adjusted to 3-5 MPa according to the pressure inside the well, thereby eliminating the vacuum phenomenon in the cylinder caused by excessively high well pressure.

[0027] Furthermore, the second electro-hydraulic directional valve 16 has a differential function. The return port of the second electro-hydraulic directional valve 16 is connected to the rodless chamber of the lifting cylinder 17 via a hydraulic line. When supplying oil to the rodless chamber of the lifting cylinder 17, the second electro-hydraulic directional valve 16 switches to the left position. The hydraulic oil in the rod chamber of the lifting cylinder 17 flows through the return port of the second electro-hydraulic directional valve 16 to the supply line of the rodless chamber of the lifting cylinder 17, accelerating the oil supply to the rodless chamber and thus increasing the lifting speed of the tubing string. Before using the differential function, the pressure of the one-way sequence valve 15 should be adjusted as low as possible.

[0028] In the lifting cylinder control circuit, the first hydraulic source 12 is a gear oil pump, whose inlet is connected to the oil tank 10 via an oil filter 11. The first hydraulic source 12 is connected to a speed sensor 21. The first hydraulic source 12 is connected to the oil tank 10 via a relief valve 13 to prevent excessive system pressure. Flow sensors 23 are installed on both the lines before and after the relief valve 13. The return port of the first electro-hydraulic directional valve 14 is connected to the oil level, and a flow sensor 23 is also installed on this line. A flow sensor 23 and a pressure sensor 24 are installed on the line between the first electro-hydraulic directional valve 14 and the rodless chamber of the lifting cylinder 17. Electrical contact pressure gauges 22 are installed at the outlets of both the first hydraulic source 12 and the one-way sequence valve 15.

[0029] To ensure the safe and reliable extraction and lowering of the tubing string from and into the well without well control or blowout, the live-line working apparatus also includes wellhead devices for clamping the tubing string or sealing the wellhead. These include traveling slips 41, fixed slips 42, annular blowout preventer 43, hydraulic gate valve 44, full-seal blowout preventer 45, and three-gate blowout preventer 46. The cylinders of each part of the wellhead apparatus are connected via hydraulic lines to the solenoid directional valve assembly 36, the fourth electro-hydraulic directional valve 34, the unloading relief valve 33, the third electro-hydraulic directional valve 32, and the second hydraulic power source 31, forming the wellhead apparatus control circuit. When the valve core of the third electro-hydraulic directional valve 32 is in the neutral position, the hydraulic oil pumped by the second hydraulic power source 31 supplies the wellhead apparatus control circuit.

[0030] Furthermore, each hydraulic cylinder in the wellhead assembly is connected to one of the solenoid directional valves in the solenoid directional valve assembly 36. Each solenoid directional valve is controlled by the operator through the control system to realize the operation of each wellhead assembly. There are two solenoid directional valve assemblies 36, and each of the two solenoid directional valve assemblies 36 is connected to the fourth electro-hydraulic directional valve 34 through a manual pressure regulating valve 35. The operator can manually adjust the pressure in the wellhead assembly control circuit.

[0031] In the wellhead control circuit, the second hydraulic source 31 is a gear oil pump, whose inlet is connected to the oil tank 10 via an oil filter 11. The first hydraulic source 12 is connected to a speed sensor 21. Pressure sensors 24 and flow sensors 23 are installed on the pipelines between the second hydraulic source 31 and the third electro-hydraulic directional valve 32, between the unloading relief valve 33 and the fourth electro-hydraulic directional valve 34, and between the manual pressure regulating valve 35 and the solenoid directional valve assembly 36. Flow sensors 23 are installed on the pipelines between the return port of the unloading relief valve 33 and the oil tank 10, and between the fourth directional valve and the manual pressure regulating valve 35. Electrical contact pressure gauges 22 are installed between the manual pressure regulating valve 35 and the solenoid directional valve assembly 36, and between the solenoid directional valve assembly 36 and all other parts of the wellhead device except for the hydraulic gate valve 44.

[0032] Hydraulic locks 37 are installed between the movable slip 41, fixed slip 42, annular blowout preventer 43, full-seal blowout preventer 45, and three-gate blowout preventer 46 and their corresponding solenoid directional valves. The fixed slip 42 and movable slip 41 operate with an interlocking safety structure, preventing them from releasing simultaneously during operation and thus avoiding tubing ejection accidents. A pressure reducing valve 431 is installed between the annular blowout preventer 43 and the solenoid directional valve to minimize control pressure while ensuring dynamic sealing. The annular blowout preventer 43 is also connected to a dedicated accumulator 432 (nitrogen purging pressure 4MPa) to balance the control pressure of the annular blowout preventer 43 and reduce wear on the sealing core when lifting and lowering the tubing joint.

[0033] To further accelerate the lifting speed of the lifting cylinder 17, a third electro-hydraulic directional valve 32 is connected between the first electro-hydraulic directional valve 14 and the first hydraulic source 12 via a hydraulic pipeline. This pipeline is equipped with a check valve 50 and a flow sensor 23. When it is necessary to control the tubing string to be pulled out or lowered into the well, the valve core of the third electro-hydraulic directional valve 32 is switched to the left or right position. Hydraulic oil pumped by the second hydraulic source 31 enters the lifting cylinder control circuit. The second hydraulic source 31 and the first hydraulic source 12 together supply oil to the lifting cylinder 17, thereby accelerating the action speed of the lifting cylinder 17.

[0034] When the second hydraulic source 31 does not supply oil to the wellhead device, the accumulator circuit supplies oil to the wellhead device. However, when the oil pressure detected by the pressure sensor 24 or the electric contact pressure gauge 22 in the wellhead device control circuit is too low and does not meet the working requirements of the wellhead device, the third electro-hydraulic directional valve 32 switches back to the neutral position, and the second hydraulic source 31 continues to supply oil to the wellhead device.

[0035] In this application, the accumulator circuit includes an accumulator 51 (nitrogen purging pressure 7-8 MPa). The accumulator 51 is connected between the fourth electro-hydraulic directional valve 34 and the unloading relief valve 33 via a hydraulic pipeline. When the second hydraulic source 31 does not supply oil to the wellhead device, the accumulator 51 supplies oil to the inlet device to maintain the system pressure.

[0036] Furthermore, the accumulator 51 is connected via hydraulic lines to the high-pressure ball valve 52, the triple valve 53, and the solenoid directional valve corresponding to the three-gate blowout preventer 46. Combined with the hydraulic lines connecting the accumulator 51 to the fourth electro-hydraulic directional valve 34 and the unloading relief valve 33, this forms the accumulator circuit. During operation, if the engine suddenly stalls or the wellhead device control circuit malfunctions, the pressure oil stored in the accumulator 51 is used to promptly close the relevant blowout preventers and slips, preventing accidents. Specifically, this involves opening the high-pressure ball valve 52 and controlling the triple valve 53 to close one of the semi-sealed gates (461, 462) of the fully sealed blowout preventer 45 and the three-gate blowout preventer 46, as well as the safety slip 463.

[0037] In this application, the control system also includes an operator's cab cylinder control circuit and a hydraulic winch control circuit. The operator's cab cylinder 62 is connected to the fifth electro-hydraulic directional valve 61 and one of the solenoid directional valves in the solenoid directional valve group 36 via hydraulic lines, forming the operator's cab cylinder control circuit. This circuit can control the lifting and lowering of the operator's cab on the live-line working machine. The hydraulic winch 72 cylinder is connected to the first manual directional valve 71 and one of the manual pressure regulating valves 35 via hydraulic lines. The first manual directional valve 71 is connected to the second manual directional valve 73 and the lifting cylinder 17 via hydraulic lines, forming the hydraulic winch control circuit. That is, the hydraulic winch 72 can be driven by the hydraulic oil flowing from the manual pressure regulating valve 35 or by the hydraulic oil flowing from the lifting cylinder 17. This circuit can drive the hydraulic winch 72 to rotate for lifting tools, oil pipes, and other structures.

[0038] The hydraulic control system of this utility model for a pressurized operation device sets up detection devices in the control circuit of the lifting cylinder, the control circuit of the wellhead device, and the accumulator circuit. When the system fails, the control system collects the pressure and / or flow data detected by the detection devices and the rotational speed detected by the speed sensor, and compares the above detection data with the calibration data in the system. This can accurately locate the fault point, thereby reducing the workload of maintenance personnel and quickly restoring production.

[0039] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0040] In the description of this specification, unless otherwise expressly defined, the terms "setup", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0041] While specific embodiments of this utility model have been described above, those skilled in the art should understand that the described embodiments are merely some, not all, embodiments of this utility model. These are merely illustrative examples, and the scope of protection of this utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model and without any inventive effort, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A hydraulic control system for a live-line working device, characterized in that, include: The system includes a lifting cylinder control circuit, a wellhead device control circuit, and an accumulator circuit. Each of these circuits is equipped with at least one detection device for detecting pressure and / or flow in the hydraulic pipeline. Both the lifting cylinder control circuit and the wellhead device control circuit include a hydraulic power source, and the hydraulic power source is equipped with a speed sensor for detecting rotational speed. The detection device and the speed sensor are electrically connected to the control system.

2. The hydraulic control system for the live-line working device according to claim 1, characterized in that, The detection device includes a flow sensor and a pressure sensor, and an electrical contact pressure gauge is connected to the hydraulic pipeline via a branch.

3. The hydraulic control system for the live-line working device according to claim 2, characterized in that, The rodless chamber of the lifting cylinder is connected to the first electro-hydraulic directional valve and the first hydraulic source via hydraulic lines, and the rod chamber of the lifting cylinder is connected to the second electro-hydraulic directional valve, the one-way sequence valve and the first electro-hydraulic directional valve via hydraulic lines, forming the control circuit of the lifting cylinder.

4. The hydraulic control system for the live-line working device according to claim 3, characterized in that, The return port of the second electro-hydraulic directional valve is connected to the rodless chamber of the lifting cylinder via a hydraulic pipeline.

5. The hydraulic control system for the live-line working device according to claim 3, characterized in that, The hydraulic cylinder of the wellhead device is connected to the electromagnetic reversing valve group, the fourth electro-hydraulic reversing valve, the unloading overflow valve, the third electro-hydraulic reversing valve, and the second hydraulic source through hydraulic pipelines, forming the control circuit of the wellhead device.

6. The hydraulic control system for the live-line working device according to claim 5, characterized in that, The wellhead device includes a moving slip, a fixed slip, an annular blowout preventer, a hydraulic gate valve, a fully sealed blowout preventer, and a three-gate blowout preventer. The cylinders of each part of the wellhead device are respectively connected to one of the electromagnetic directional valves in the electromagnetic directional valve group. There are two electromagnetic directional valve groups. The two electromagnetic directional valve groups are respectively connected to the fourth electro-hydraulic directional valve through a manual pressure regulating valve.

7. The hydraulic control system for the live-line working device according to claim 5, characterized in that, The third electro-hydraulic directional valve is connected between the first electro-hydraulic directional valve and the first hydraulic source via a hydraulic pipeline.

8. The hydraulic control system for the live-line working device according to claim 6, characterized in that, The accumulator circuit includes an accumulator, which is connected between the fourth electro-hydraulic directional valve and the unloading relief valve via a hydraulic pipeline.

9. The hydraulic control system for the live-line working device according to claim 8, characterized in that, The accumulator is connected to the high-pressure ball valve, the triple valve and the solenoid directional valve corresponding to the three-gate blowout preventer via hydraulic lines. Together with the hydraulic lines connecting the accumulator to the fourth electro-hydraulic directional valve and the unloading relief valve, the accumulator circuit is formed.

10. The hydraulic control system for the live-line working device according to claim 6, characterized in that, The control system also includes an operator's cab cylinder control circuit and a hydraulic winch control circuit. The operator's cab cylinder is connected to a fifth electro-hydraulic directional valve and one of the electromagnetic directional valves in the electromagnetic directional valve group via hydraulic lines, forming the operator's cab cylinder control circuit. The hydraulic winch cylinder is connected to a first manual directional valve and one of the manual pressure regulating valves via hydraulic lines. The first manual directional valve is connected to a second manual directional valve and the lifting cylinder via hydraulic lines, forming the hydraulic winch control circuit.

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