An interlocking control system for power elevators and power slips

Abstract

The present invention relates to an interlocking control system for a power elevator and a power slip, belonging to the field of pneumatic control, comprising an elevator cylinder and a slip cylinder, the air inlet end of the elevator cylinder being connected to a first air inlet pipe, the first air inlet pipe being provided with an elevator one-way valve, an elevator air-controlled one-way valve and an elevator manual reversing valve in sequence along the air inlet direction, the first air inlet pipe being provided with an elevator stop valve, the elevator stop valve being connected in parallel with the elevator air-controlled one-way valve, the air outlet end of the elevator cylinder being connected to a first air outlet pipe, the first air outlet pipe being connected with an elevator stroke valve, the first air outlet pipe being connected to the elevator manual reversing valve via a first branch pipe; the air inlet end of the slip cylinder being connected to a second air inlet pipe, the present invention adopts pneumatic principles, realizes reliability of operation in a complex drilling environment, and simplifies the pipeline connection between the control cabinet and the elevator and slips.

Description

Technical Field

[0001] The invention relates to an interlocking control system for a power elevator and a power slip, and belongs to the field of pneumatic control. Background Art

[0002] During the drilling process, power elevators and power slips (chucks) are crucial equipment for securing and lifting the tubing string. Because elevators and slips typically require coordinated operation, an integrated electrically controlled solenoid reversing valve is often used to achieve interlocking to prevent accidental contact or misoperation, which could lead to safety hazards.

[0003] The Chinese invention patent with publication number CN118187806A discloses a redundant safety interlocking system for power elevators and power slips, including a control system, which is electrically connected to an elevator engagement sensor, an elevator load sensor, and an elevator opening solenoid valve installed on the elevator body, a slip closing sensor, a slip load sensor, and a slip opening solenoid valve installed on the slip body, a control system installed inside the driller's room control cabinet, and an instrument system installed inside the instrument control cabinet. This invention solves the problem that existing interlocking systems are unable to determine the correctness of switch signals and cannot achieve safety interlocking after sensor failure. It improves the system's fault diagnosis capability for the sensor system, realizes safe operation, and achieves the goal of safe and efficient production. However, in the existing technology, due to the disadvantages of electrical flammability, explosiveness, and susceptibility to interference, the electrical requirements are extremely high for special working conditions such as high oil and gas concentrations and salt spray, making it difficult to adapt to complex drilling environments.

[0004] Therefore, there is a need for an interlocking control system for power elevators and power slips to achieve reliability in operation under complex drilling environments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, an interlocking control system for power elevators and power slips is provided to achieve operational reliability in complex drilling environments.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: an interlocking control system for a power elevator and a power slip, comprising an elevator cylinder and a slip cylinder, wherein the air inlet end of the elevator cylinder is connected to a first air inlet pipe, and an elevator one-way valve, an elevator air-controlled one-way valve and an elevator manual reversing valve are sequentially arranged on the first air inlet pipe along the air inlet direction, and an elevator stop valve is further provided on the first air inlet pipe, and the elevator stop valve and the elevator air-controlled one-way valve are connected in parallel; the air outlet end of the elevator cylinder is connected to a first air outlet pipe, and the first air outlet pipe is connected to an elevator stroke valve, and the first air outlet pipe is connected to the elevator manual reversing valve through a first branch pipe;

[0007] The air inlet end of the slip cylinder is connected to a second air inlet pipe, and a slip one-way valve, a slip air-controlled one-way valve and a slip manual reversing valve are sequentially arranged on the second air inlet pipe along the air inlet direction. A slip stop valve is also provided on the second air inlet pipe, and the slip stop valve is connected in parallel with the slip air-controlled one-way valve. The air outlet end of the slip cylinder is connected to a second air outlet pipe, and a slip stroke valve is connected to the second air outlet pipe. The second air outlet pipe is connected to the slip manual reversing valve through a second branch pipe.

[0008] The elevator stroke valve is connected to the slip air-controlled one-way valve via a first connecting pipe, and the first connecting pipe is provided with an elevator air release valve;

[0009] The slip valve is connected to the elevator air-controlled one-way valve via a second connecting pipe, and a slip air release valve is provided on the second connecting pipe;

[0010] The air inlet end of the first air inlet pipe and the air inlet end of the second air inlet pipe are both connected to an air intake manifold, and the air intake manifold is connected to an air source.

[0011] Preferably, the elevator air release valve is connected to an elevator signal display.

[0012] Preferably, the slip air release valve is connected to a slip signal display.

[0013] Preferably, a triplex is provided on the air intake manifold.

[0014] Preferably, the triplex consists of three parts: a filter, a pressure regulating valve and a lubricator.

[0015] Preferably, the number of the elevator cylinders and the number of the slip cylinders are both plural.

[0016] Preferably, the number of the elevator cylinders and the number of the slip cylinders are four.

[0017] Preferably, a pressure gauge is provided at the output end of the intake manifold.

[0018] Preferably, the formula for the system pressure and the sizes of the elevators and slips is P=aD, where P represents the system pressure, a represents the coefficient, and D represents the diameter of the elevators and slips.

[0019] Preferably, a is 0.6.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The invention discloses an interlocking control system for power elevators and power slips, which adopts pneumatic principle, realizes reliability of operation in complex drilling environment, and simplifies pipeline connection between control cabinet, elevators and slips. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of an interlocking control system for power elevators and power slips;

[0023] Figure 2 This is the clamping state control flow chart;

[0024] Figure 3 This is the control flow chart for the unclamped state.

[0025] in:

[0026] Elevator cylinder 1, slip cylinder 2, air intake manifold 3, air source 4, triplex 5, pressure gauge 6;

[0027] First air inlet pipe 101, elevator one-way valve 102, elevator pneumatic one-way valve 103, elevator manual reversing valve 104, elevator stop valve 105, first air outlet pipe 106, elevator stroke valve 107, first branch pipe 108, first connecting pipe 109, elevator air release valve 110, elevator signal display 111;

[0028] Second air inlet pipe 201, slip one-way valve 202, slip air-controlled one-way valve 203, slip manual reversing valve 204, slip stop valve 205, second air outlet pipe 206, slip stroke valve 207, second branch pipe 208, second connecting pipe 209, slip air release valve 210, slip signal display 211. DETAILED DESCRIPTION

[0029] like Figure 1-3 As shown, an interlocking control system for a power elevator and a power slip in this embodiment includes an elevator cylinder 1 and a slip cylinder 2. The number of the elevator cylinder 1 and the number of the slip cylinder 2 are both plural, and specifically four.

[0030] The air inlet end of the elevator cylinder 1 is connected to a first air inlet pipe 101. An elevator one-way valve 102, an elevator pneumatic one-way valve 103, and an elevator manual reversing valve 104 are sequentially provided on the first air inlet pipe 101 along the air inlet direction. An elevator stop valve 105 is also provided on the first air inlet pipe 101. The elevator stop valve 105 is connected in parallel with the elevator pneumatic one-way valve 103. The air outlet end of the elevator cylinder 1 is connected to a first air outlet pipe 106. The first air outlet pipe 106 is connected to an elevator stroke valve 107. The first air outlet pipe 106 is connected to the elevator manual reversing valve 104 via a first branch pipe 108.

[0031] The air inlet end of the slip cylinder 2 is connected to a second air inlet pipe 201, on which a slip one-way valve 202, a slip air-controlled one-way valve 203 and a slip manual reversing valve 204 are sequentially arranged along the air inlet direction. A slip stop valve 205 is also provided on the second air inlet pipe 201, and the slip stop valve 205 is connected in parallel with the slip air-controlled one-way valve 203. The air outlet end of the slip cylinder 2 is connected to a second air outlet pipe 206, on which a slip stroke valve 207 is connected. The second air outlet pipe 206 is connected to the slip manual reversing valve 204 through a second branch pipe 208.

[0032] The elevator stroke valve 107 is connected to the slip air-controlled one-way valve 203 via a first connecting pipe 109 , and an elevator bleed valve 110 is provided on the first connecting pipe 109 , and an elevator signal display 111 is connected to the elevator bleed valve 110 ;

[0033] The slip stroke valve 207 is connected to the elevator air-controlled one-way valve 103 via a second connecting pipe 209 , a slip air release valve 210 is provided on the second connecting pipe 209 , and a slip signal display 211 is connected to the slip air release valve 210 ;

[0034] The air inlet end of the first air inlet pipe 101 and the air inlet end of the second air inlet pipe 201 are both connected to an air inlet manifold 3, which is connected to an air source 4. A triplex 5 is provided on the air inlet manifold 3. Here, the triplex 5 consists of three parts: a filter, a pressure regulating valve, and a lubricator. The filter is used to remove impurities and moisture from the air to ensure that the air entering the pneumatic system is clean. The pressure regulating valve is used to adjust the pressure of the gas to ensure that the air pressure in the system is stable within a set range. The lubricator provides lubricating oil to the pneumatic components to ensure that the pneumatic components are adequately lubricated during operation, thereby reducing wear and friction and extending the life of the equipment.

[0035] The output end of the intake manifold 3 is provided with a pressure gauge 6, through which the air pressure is detected;

[0036] This interlock control system is installed in the control area of ​​the drilling platform. The elevator cylinder 1 is connected to the elevator. The elevator is opened and clamped by extending and retracting the elevator cylinder 1. The slip cylinder 2 is connected to the slip. The slip is opened and clamped by extending and retracting the slip cylinder 2.

[0037] The controller manually controls the elevator stop valve 105 and the slip stop valve 205 to close to control the interlock between the elevator and the slips, i.e., the interlock function is turned on. The controller manually controls the elevator stop valve 105 and the slip stop valve 205 to open to control the movement of the elevator or the slips individually, i.e., the interlock function is released.

[0038] This interlock control system retracts the elevator cylinder 1 or the slip cylinder 2, and opens the elevator stroke valve 107 or the slip stroke valve 207 through a mechanical connection;

[0039] When the elevator stroke valve 107 is opened, the slip air-controlled one-way valve 203 is opened, and the gas enters the slip manual reversing valve 204, thereby controlling the slip cylinder 2 to extend and realize the slip opening;

[0040] When the slip valve 207 is opened, the elevator air-controlled check valve 103 opens, and the gas enters the elevator manual reversing valve 104, thereby controlling the elevator cylinder 1 to extend, and the elevator is opened;

[0041] That is, the elevator cylinder 1 and the slip cylinder 2 can be retracted at the same time, but cannot be extended at the same time. Specifically, the elevator cylinder 1 and the slip cylinder 2 are two types of cylinders, and one of them can only be extended when the other cylinder is fully retracted;

[0042] The slips or elevators can confirm the signal clamping position by adjusting the position of the slip stroke valve 207 or the elevator stroke valve 107;

[0043] The extension and retraction of the slip cylinder 2 and the elevator cylinder 1 are controlled by the slip manual reversing valve 204 and the elevator manual reversing valve 104 .

[0044] When the slip manual reversing valve 204 and the elevator manual reversing valve 104 control the slip cylinder 2 and the elevator cylinder 1 to retract and do not touch the slip stroke valve 207 or the elevator stroke valve 107, at this moment, the elevator air-controlled one-way valve 103 or the slip air-controlled one-way valve 203 does not work, that is, the elevator air-controlled one-way valve 103 or the slip air-controlled one-way valve 203 is closed, and gas cannot pass through the pipelines, so the pneumatic components cannot be operated. When the slip cylinder 2 and the elevator cylinder 1 continue to retract and touch the slip stroke valve 207 or the elevator stroke valve 107, at this moment, the slip air-controlled one-way valve or the slip air-controlled one-way valve 203 is opened, and gas passes through the pipelines, so the pneumatic components can be operated.

[0045] The elevator signal indicator 111 and the slip signal indicator 211 display colors when there is gas flowing in, and do not display colors when there is gas flowing out;

[0046] In the clamping state, the elevator stroke valve 107 or the slip stroke valve 207 is touched. At this moment, the touched elevator stroke valve 107 or the slip stroke valve 207 is opened, and the gas passes through the elevator air release valve 110 or the slip air release valve 210. At this time, the elevator signal display 111 and the slip signal display 211 display colors, that is, the clamping state is met and a signal is displayed.

[0047] When the elevator manual reversing valve 104 or the slip manual reversing valve 204 controls the elevator cylinder 1 or the slip cylinder 2 to extend, at this moment, the elevator stroke valve 107 or the slip stroke valve 207 is touched and closed, the original elevator signal indicator 111 and the slip signal indicator 211 display the internal air pressure, which is released through the elevator air release valve 110 or the slip air release valve 210. At this time, the elevator signal indicator 111 and the slip signal indicator 211 do not display any color, that is, they are in the unclamped state and no signal is displayed.

[0048] According to the above pneumatic interlocking principle, after the manual reversing valve 104 of the elevator controls the pneumatic elevator to be clamped, the elevator signal display 111 changes color. At the same time, the air circuit controls the air-controlled one-way valve 203 of the slips to be opened. At this moment, the manual reversing valve 204 of the slips can be controlled to operate the slips to be opened or closed. Similarly, after the manual reversing valve 204 of the slips controls the pneumatic slips to be clamped, the slip signal display 211 changes color. At the same time, the air circuit controls the air-controlled one-way valve 103 of the elevator to be opened. At this moment, the manual reversing valve 104 of the elevator can be controlled to operate the elevator to be opened or closed.

[0049] Pressure holding function:

[0050] The elevator check valve 102 or slip check valve 202 is used to maintain the system pressure of the elevator or slip circuit separately, ensuring that the elevator and slip can maintain the necessary clamping and locking pressure for a short period of time in the event of a gas outage or emergency shutdown, preventing accidental sticking of the slips that may cause damage to the equipment or tubing, and effectively improving the safety and stability of the system.

[0051] The system pressure is determined by the size of the elevators and slips. According to the formula P=aD, P represents the system pressure, a represents the coefficient, and D represents the diameter of the elevators and slips. The larger the size of the elevators and slips, the larger the applicable drill pipe space, and the higher the required system pressure.

[0052] The value of a depends on environmental factors such as humidity, temperature, downhole pressure, and rock formation type. Usually, a is set to 0.6, 0.7, 0.8, 0.9, and the greater the drilling difficulty, the larger the value of a.

[0053] Taking a as 0.6 as an example, the relationship between system pressure and elevator and slip dimensions is shown in Table 1:

[0054] Table 1: Relationship between system pressure and elevator and slip dimensions

[0055]

[0056] Taking a as 0.7 as an example, the relationship between system pressure and elevator and slip dimensions is shown in Table 2:

[0057] Table 2: Relationship between system pressure and elevator and slip dimensions

[0058]

[0059] Taking a as 0.8 as an example, the relationship between system pressure and elevator and slip dimensions is shown in Table 3:

[0060] Table 3: Relationship between system pressure and elevator and slip dimensions

[0061]

[0062] Taking a as 0.9 as an example, the relationship between system pressure and elevator and slip dimensions is shown in Table 4:

[0063] Table 4: Relationship between system pressure and elevator and slip dimensions

[0064]

[0065] In Tables 1 to 4, the elevator and slip dimensions are diameters in mm, and the system pressure represents the air pressure in bar;

[0066] Here, it should be noted that a chuck cylinder can be provided separately, and the chuck cylinder is connected to the chuck. The pneumatic operation principle of the chuck cylinder is the same as that of the slip cylinder 2. The functions of the slip and the chuck are both to hold the pipe column. The chuck is used on the turntable, and the slip is used under the turntable.

[0067] In summary, the interlocking control system for power elevators and power slips adopts the pneumatic principle, achieves reliability in operation under complex drilling environments, and simplifies the piping connections between the control cabinet and the elevators and slips.

[0068] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. An interlocking control system for a power elevator and a power slip, comprising an elevator cylinder (1) and a slip cylinder (2), characterized in that: The air inlet end of the elevator cylinder (1) is connected to a first air inlet pipe (101), and an elevator one-way valve (102), an elevator pneumatic one-way valve (103), and an elevator manual reversing valve (104) are sequentially arranged on the first air inlet pipe (101) along the air inlet direction. An elevator stop valve (105) is also arranged on the first air inlet pipe (101), and the elevator stop valve (105) is connected in parallel with the elevator pneumatic one-way valve (103). The air outlet end of the elevator cylinder (1) is connected to a first air outlet pipe (106), and an elevator stroke valve (107) is connected to the first air outlet pipe (106). The first air outlet pipe (106) is connected to the elevator manual reversing valve (104) through a first branch pipe (108); The air inlet end of the slip cylinder (2) is connected to a second air inlet pipe (201), and a slip one-way valve (202), a slip air-controlled one-way valve (203), and a slip manual reversing valve (204) are sequentially provided on the second air inlet pipe (201) along the air inlet direction. A slip stop valve (205) is also provided on the second air inlet pipe (201), and the slip stop valve (205) is connected in parallel with the slip air-controlled one-way valve (203). The air outlet end of the slip cylinder (2) is connected to a second air outlet pipe (206), and a slip stroke valve (207) is connected to the second air outlet pipe (206). The second air outlet pipe (206) is connected to the slip manual reversing valve (204) via a second branch pipe (208). The elevator stroke valve (107) is connected to the slip air-controlled one-way valve (203) via a first connecting pipe (109), and the first connecting pipe (109) is provided with an elevator air release valve (110); The slip stroke valve (207) is connected to the elevator air-controlled one-way valve (103) via a second connecting pipe (209), and a slip air release valve (210) is provided on the second connecting pipe (209); The air inlet end of the first air inlet pipe (101) and the air inlet end of the second air inlet pipe (201) are both connected to an air inlet manifold (3), and the air inlet manifold (3) is connected to an air source (4).

2. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The elevator air release valve (110) is connected to an elevator signal display (111).

3. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The slip air release valve (210) is connected to a slip signal display (211).

4. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The air intake manifold (3) is provided with a triplex (5).

5. The interlocking control system for power elevators and power slips according to claim 4, characterized in that: The triplex (5) consists of three parts: a filter, a pressure regulating valve and a lubricator.

6. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The number of the elevator cylinders (1) and the number of the slip cylinders (2) are both plural.

7. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The number of the elevator cylinders (1) and the number of the slip cylinders (2) are specifically four.

8. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: A pressure gauge (6) is provided at the output end of the intake manifold (3).

9. The interlocking control system for power elevators and power slips according to claim 1, characterized in that: The formula for the system pressure and the sizes of elevators and slips is P=aD, where P represents the system pressure, a represents the coefficient, and D represents the diameters of the elevators and slips.

10. The interlocking control system for power elevators and power slips according to claim 9, characterized in that: The a is taken as 0.6.

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