Drilling and workover oil casing centralizing device and using method

Abstract

The invention relates to the technical field of petroleum drilling and workover, in particular to a drilling and workover oil casing centralizing device and a using method, the drilling and workover oil casing centralizing device comprises a derrick, a connecting mechanism is installed on the side wall of the derrick, control mechanisms are installed on the derrick and the connecting mechanism, and a clamping mechanism is installed at the end, away from the derrick, of the connecting mechanism; the connecting mechanism comprises a first connecting arm, one end of the first connecting arm is movably connected with a second connecting arm, and the other end of the second connecting arm is movably connected with a third connecting arm; the clamping mechanism comprises a fixing plate, the interior of the fixing plate is movably connected with two flexible arc plates; the control mechanism comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder. The two-position three-way air switch is powered by an air source, stretches out when used and retracts when not used, an operator only needs to remotely operate the two-position three-way air switch on a drill floor, safety, high efficiency and assistance are achieved, underground complexity is reduced, and production continuity of enterprises is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling and workover, in particular to a casing centralizing device for oil drilling and workover and a use method thereof. BACKGROUND

[0002] In the past, the last step of the drilling and workover operation is to lower the casing. In the construction application in recent years, the equipment design has an independent casing centralizing platform. When the casing needs to be lowered, the operator manually operates the casing centralizing platform to suspend the casing and centralize the casing. The casing is connected to the mother buckle borehole, and the casing is suspended. The casing centralizing platform operator cannot move, and because the casing is heavy and has a large outer diameter, the operator can only centralize the casing forward and backward when the casing is in a suspended state, and cannot effectively centralize the casing left and right. In recent years, with the continuous increase of drilling depth, the diameter of the surface casing increases, and the overall drilling equipment becomes wider. The high-altitude operator cannot effectively centralize the casing, resulting in frequent casing up-dogging errors. The labor intensity of the operator is high, the work efficiency is low, the downhole is complex, the safety risk is great, and according to statistics, the casing up-dogging error events have increased in recent years, resulting in great losses. In order to reduce the safety risk and labor intensity and improve the work efficiency, the present application provides a casing centralizing device for oil drilling and workover and a use method thereof. SUMMARY

[0003] The present application aims to solve the problems in the prior art and provides a casing centralizing device for oil drilling and workover and a use method thereof.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a casing centralizing device for oil drilling and workover, comprising a derrick, a connecting mechanism is installed on the side wall of the derrick, a control mechanism is installed on the derrick and the connecting mechanism, and a clamping mechanism is installed on the end of the connecting mechanism away from the derrick. The connecting mechanism comprises a first connecting arm, a second connecting arm is movably connected to one end of the first connecting arm, and a third connecting arm is movably connected to the other end of the second connecting arm. The clamping mechanism comprises a fixed plate, a flexible arc plate is movably connected to the inside of the fixed plate, and the number of the flexible arc plates is two. The control mechanism comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, one end of the first cylinder is movably connected with the upper surface of the first connecting arm, one end of the second cylinder is movably connected with the lower surface of the first connecting arm, the other end of the second cylinder is movably connected with the lower surface of the second connecting arm, one end of the third cylinder is movably connected with the upper surface of the second connecting arm, the other end of the third cylinder is movably connected with the upper surface of the third connecting arm, the fourth cylinder is two in number, and the two fourth cylinders are movably connected with the outer surfaces of the two flexible arc plates respectively.

[0005] As a further description of the above technical solution: The derrick comprises a derrick main body, a first fixing seat is fixedly connected to the side surface of the derrick main body, a first connecting frame is fixedly connected to the surface of the first fixing seat, and the other end of the first connecting arm is movably connected with the first connecting frame.

[0006] As a further description of the above technical solution: A second fixing seat is fixedly connected to the side surface of the derrick main body, the second fixing seat is located above the first fixing seat, a second connecting frame is fixedly connected to the surface of the second fixing seat, and the other end of the first cylinder is movably connected with the second connecting frame.

[0007] As a further description of the above technical solution: An A1 gas inlet is fixedly connected to the surface of the first cylinder, an A2 gas inlet is fixedly connected to the surface of the first cylinder, and the A2 gas inlet is located below the A1 gas inlet.

[0008] As a further description of the above technical solution: A B1 gas inlet is fixedly connected to the surface of the second cylinder, a B2 gas inlet is fixedly connected to the surface of the second cylinder, and the B2 gas inlet is located on the right side of the B1 gas inlet.

[0009] As a further description of the above technical solution: A C1 gas inlet is fixedly connected to the surface of the third cylinder, a C2 gas inlet is fixedly connected to the surface of the third cylinder, and the C2 gas inlet is located on the right side of the C1 gas inlet.

[0010] As a further description of the above technical solution: A D1 gas inlet is fixedly connected to the surface of the fourth cylinder, a D2 gas inlet is fixedly connected to the surface of the fourth cylinder, and the D2 gas inlet is located on the side of the D1 gas inlet away from the third connecting arm.

[0011] As a further description of the above technical solution: The inner surface of the flexible arc plate is provided with a clamping groove, a single-end pin is arranged in the clamping groove, the number of the single-end pins is multiple, a spring is arranged on the outer surface of the single-end pin, and a bearing is arranged on the outer surface of the single-end pin and below the spring.

[0012] A method for using a downhole oil casing centralizing device for drilling and workover, comprising the following steps: Step one, install the first fixed seat and the second fixed seat to connect with the derrick main body, check and adjust the specification of the flexible arc plate to match the current pipe string specification; Step two, connect the gas inlet hole of the third cylinder, let the gas flow from C1 gas inlet hole to C2 gas outlet hole, and the piston rod of the third cylinder moves, pushing the third connecting arm to extend; Step three, connect the gas inlet hole of the second cylinder, let the gas flow from B1 gas inlet hole to B2 gas outlet hole, and the piston rod of the second cylinder moves, pushing the second connecting arm to extend; Step four, connect the gas inlet hole of the first cylinder, let the gas flow from A1 gas inlet hole to A2 gas outlet hole, and the piston rod of the first cylinder moves, pushing the first connecting arm to extend; Step five, connect the gas inlet hole of the fourth cylinder, let the gas flow from D1 gas inlet hole to D2 gas outlet hole, and the piston rod of the fourth cylinder moves, adjusting the deflection angle of the flexible arc plate; Step six, according to the casing inclination angle, cooperate with the operation of each cylinder to centralize the casing.

[0013] The present application has the following beneficial effects: Compared with the prior art, the downhole oil casing centralizing device for drilling and workover and the use method thereof, the device uses gas source as power, extends when used, and is retracted when not used, and the operating personnel only needs to remotely operate a two-position three-way gas switch on the drilling platform, so that safety, high efficiency and power assistance are realized, the downhole complexity is reduced, and the continuity of enterprise production is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is an overall structure schematic diagram of the downhole oil casing centralizing device for drilling and workover; Figure 2 It is a clamping mechanism schematic diagram of the downhole oil casing centralizing device for drilling and workover; Figure 3 It is a structure of the downhole oil casing centralizing device for drilling and workover; Figure 2 It is an enlarged view of structure A in the middle; Figure 4 It is an enlarged view of structure B in the middle of the downhole oil casing centralizing device for drilling and workover; Figure 2 It is an enlarged view of structure B in the middle of the downhole oil casing centralizing device for drilling and workover; Figure 5A gas circuit diagram of a casing centralizer for drilling and workover is provided.

[0015] Legend: 1, derrick; 101, derrick main body; 102, first fixed seat; 103, first connecting frame; 104, second fixed seat; 105, second connecting frame; 2, connecting mechanism; 201, first connecting arm; 202, second connecting arm; 203, third connecting arm; 3, control mechanism; 301, first air cylinder; 302, A1 gas inlet; 303, A2 gas inlet; 304, second air cylinder; 305, B1 gas inlet; 306, B2 gas inlet; 307, third air cylinder; 308, C1 gas inlet; 309, C2 gas inlet; 310, fourth air cylinder; 311, D1 gas inlet; 312, D2 gas inlet; 4, clamping mechanism; 401, fixed plate; 402, flexible arc plate; 403, clamping groove; 404, single-end pin; 405, spring; 406, bearing; 5, gas source; 6, gas source switch; 7, first pressure regulating valve; 8, second pressure regulating valve; 9, two-position three-way gas switch. DETAILED DESCRIPTION

[0016] Reference Figures 1-5 The casing centralizer for drilling and workover provided by the present application comprises a derrick 1, a connecting mechanism 2 is installed on the side wall of the derrick 1, a control mechanism 3 is installed on the derrick 1 and the connecting mechanism 2, a clamping mechanism 4 is installed on the end of the connecting mechanism 2 away from the derrick 1, the clamping mechanism 4 is controlled to move forward and backward and clamp the casing through the cooperation of the connecting mechanism 2 and the control mechanism 3, the movement of the casing is controlled, and the casing is centralized; The connecting mechanism 2 comprises a first connecting arm 201, one end of the first connecting arm 201 movably connects a second connecting arm 202, the first connecting arm 201 movably connects the second connecting arm 202 through a shear-resistant pin, the other end of the second connecting arm 202 movably connects a third connecting arm 203, and the second connecting arm 202 movably connects the third connecting arm 203 through a shear-resistant pin; The clamping mechanism 4 comprises a fixed plate 401, the outer surface of the fixed plate 401 is fixedly connected with the right side end of the third connecting arm 203, the inside of the fixed plate 401 movably connects a flexible arc plate 402, the number of the flexible arc plates 402 is two, the two flexible arc plates 402 can rotate on the left and right sides of the fixed plate 401, the two flexible arc plates 402 clamp the casing, the position of the casing is adjusted, the casing is centralized, when the casing needs to be displaced backward, according to the design of the arc shape, after the casing enters, the end ports of the arc plates are close to each other under the action of the cylinder, and the casing is prevented from sliding out when the pneumatic arm is retracted; The control mechanism 3 comprises a first air cylinder 301, a second air cylinder 304, a third air cylinder 307, and a fourth air cylinder 310. One end of the first air cylinder 301 is movably connected to the upper surface of the first connecting arm 201, so that the first air cylinder 301 can control the movement of the first connecting arm 201. One end of the second air cylinder 304 is movably connected to the lower surface of the first connecting arm 201, and the other end of the second air cylinder 304 is movably connected to the lower surface of the second connecting arm 202, so that the second air cylinder 304 can control the movement of the second connecting arm 202. One end of the third air cylinder 307 is movably connected to the upper surface of the second connecting arm 202, and the other end of the third air cylinder 307 is movably connected to the upper surface of the third connecting arm 203, so that the third air cylinder 307 can control the movement of the third connecting arm 203. The fourth air cylinder 310 is provided in two numbers, and the two fourth air cylinders 310 are respectively installed on the left and right side walls of the third connecting arm 203. The ends of the two fourth air cylinders 310 away from the third connecting arm 203 are respectively movably connected to the outer surfaces of the two flexible arc plates 402, so that the two fourth air cylinders 310 can respectively control the rotation of the two flexible arc plates 402 inside the fixed plate 401. When one side of the arc plate moves, the other side of the arc plate is not affected, realizing independent displacement of the arc plate. The specifications of the arc plate frame can be manually adjusted to meet the requirements of various specifications of the sleeve.

[0017] The derrick 1 comprises a derrick main body 101, and a first fixed seat 102 is fixedly connected to the side surface of the derrick main body 101. A first connecting frame 103 is fixedly connected to the surface of the first fixed seat 102, and the other end of the first connecting frame 103 is movably connected to the first connecting arm 201, so as to facilitate the installation of the first connecting arm 201 on the derrick main body 101. A second fixed seat 104 is fixedly connected to the side surface of the derrick main body 101, and the second fixed seat 104 is located above the first fixed seat 102. A second connecting frame 105 is fixedly connected to the surface of the second fixed seat 104, and the other end of the second connecting frame 105 is movably connected to the first air cylinder 301, so as to facilitate the installation of the first air cylinder 301 on the derrick main body 101.

[0018] When in use, the straightening device supplies air to each cylinder through air source 5. An air source switch 6 is installed at the output end of air source 5 via a pipeline, serving as the main switch for controlling the gas flow in the pipeline. Air source switch 6 is connected to a first pressure regulating valve 7 via a pipeline, which adjusts the gas pressure in the pipeline. The first pressure regulating valve 7 is connected to multiple second pressure regulating valves 8 and a two-position three-way air switch 9 via pipelines. The design of the two-position three-way air switch 9 allows the operator to manually operate the handle to the left or right position to control the cylinder extension and retraction. When the cylinder remains stationary, the middle position neither allows air in nor out. Each two-position three-way air switch 9 has two connecting pipes installed inside, with the connecting pipes located away from the two-position three-way air switch 9. Each end is connected to the air supply port on each cylinder. There are a total of 5 two-position three-way air switches 9. Switch 1 supplies air to the first cylinder 301, switch 2 supplies air to the second cylinder 304, switch 3 supplies air to the third cylinder, and switches 4 and 5 supply air to the two fourth cylinders 310 respectively. Switches 4 and 5 are designed with independent pressure regulating valves. When it is necessary to adjust the left and right displacement of the sleeve, the speed of the cylinder piston can be flexibly and slowly controlled according to the amount of sleeve deviation to achieve smooth displacement. By supplying air through the air source 5 and adjusting the switch 9, the working status of each cylinder can be controlled.

[0019] The surface of the first cylinder 301 is fixedly connected with an A1 gas inlet hole 302, the surface of the first cylinder 301 is fixedly connected with an A2 gas inlet hole 303, the A2 gas inlet hole 303 is located below the A1 gas inlet hole 302, the 1st two-position three-way gas switch is operated to connect the main gas to the first cylinder 301, so that the gas flows into the A1 gas inlet hole 302 and flows out of the A2 gas inlet hole 303, the piston clear rod of the first cylinder 301 acts to push the first connecting arm 201 to extend, the surface of the second cylinder 304 is fixedly connected with a B1 gas inlet hole 305, the surface of the second cylinder 304 is fixedly connected with a B2 gas inlet hole 306, the B2 gas inlet hole 306 is located on the right side of the B1 gas inlet hole 305, the 2nd two-position three-way gas switch is operated to connect the main gas to the second cylinder 304, so that the gas flows into the B1 gas inlet hole 305 and flows out of the B2 gas inlet hole 306, the piston clear rod of the second cylinder 304 acts to push the second connecting arm 202 to extend, the surface of the third cylinder 307 is fixedly connected with a C1 gas inlet hole 308, the surface of the third cylinder 307 is fixedly connected with a C2 gas inlet hole 309, the C2 gas inlet hole 309 is located on the right side of the C1 gas inlet hole 308, the 3rd two-position three-way gas switch is operated to connect the main gas to the third cylinder 307, so that the gas flows into the C1 gas inlet hole 308 and flows out of the C2 gas inlet hole 309, the piston clear rod of the third cylinder 307 acts to push the third connecting arm 203 to extend, the surface of the fourth cylinder 310 is fixedly connected with a D1 gas inlet hole 311, the surface of the fourth cylinder 310 is fixedly connected with a D2 gas inlet hole 312, the D2 gas inlet hole 312 is located on the side of the fourth cylinder 310 away from the third connecting arm 203, the 4th and 5th two-position three-way gas switches are operated to connect the main gas to the gas inlet holes on the two fourth cylinders 310, so that the gas flows into the D1 gas inlet hole 311 and flows out of the D2 gas inlet hole 312, the piston clear rod of the fourth cylinder 310 acts to adjust the deflection angle of the flexible arc plate 402.

[0020] A clamping groove 403 is formed in the inner surface of the flexible arc plate 402, a single-end pin 404 is mounted in the clamping groove 403, the number of the single-end pins 404 is multiple, a spring 405 is sleeved on the outer surface of the single-end pin 404, a bearing 406 is sleeved on the outer surface of the single-end pin 404, and the bearing 406 is located below the spring 405. When the male thread of the casing is connected with the female thread of the casing in the well in the positive rotation mode, there is an axial downward traction force, the lower end of the bearing 406 is designed with the spring 405, the casing moves downward in the positive rotation mode, the spring is compressed, and when the casing is loosened, the bearing 406 is reset. The flexible arc plate 402 is processed in the shape of an I-shaped steel with a length of 380 mm, a height of 60 mm and a width of 45 mm, and a bearing is designed in the middle.

[0021] A use method of a downhole oil casing centralizing device for drilling and repairing wells comprises the following steps. Step one, install the pneumatic arm fixing seat with the I-shaped steel groove of the derrick, check and adjust the specifications of the flexible arc plate to match the current pipe string specifications. Step two, operate the 3 two-position three-way gas switch, make the main gas connect the third cylinder C1, at the same time, C2 pipeline exhaust to C2 exhaust, the piston clear rod member action, push the third connecting arm out; Step three, operate the 2 two-position three-way gas switch, make the main gas connect the second cylinder B1, at the same time, B2 pipeline exhaust to B2 exhaust, the piston clear rod member action, push the second connecting arm out; Step four, operate the 1 two-position three-way gas switch, make the main gas connect the first cylinder A1, at the same time, A2 pipeline exhaust to A2 exhaust, the piston clear rod member action, push the first connecting arm out; Step five, operate the 4 two-position three-way gas switch, make the main gas connect a fourth cylinder D2, at the same time, D1 pipeline exhaust to D2 exhaust, the piston clear rod member action; Step six, operate the 5 two-position three-way gas switch, make the main gas connect another fourth cylinder D2, at the same time, D1 pipeline exhaust to D2 exhaust, the piston clear rod member action; Step seven, according to the casing inclination angle, cooperate with operating each two-position three-way gas switch to right the casing.

[0022] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for the skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of the present application.

Claims

1. A drilling and workover under casing centralizer device comprising a derrick (1) characterised in that: The side wall of the derrick (1) is provided with a connecting mechanism (2), the derrick (1) and the connecting mechanism (2) are provided with control mechanisms (3), and the connecting mechanism (2) is provided with a clamping mechanism (4) away from the derrick (1); The connecting mechanism (2) comprises a first connecting arm (201), one end of the first connecting arm (201) is movably connected with a second connecting arm (202), and the other end of the second connecting arm (202) is movably connected with a third connecting arm (203); The clamping mechanism (4) comprises a fixed plate (401), the inside of the fixed plate (401) is movably connected with flexible arc plates (402), and the number of the flexible arc plates (402) is two. The control mechanism (3) comprises a first cylinder (301), a second cylinder (304), a third cylinder (307) and a fourth cylinder (310), one end of the first cylinder (301) is movably connected with the upper surface of the first connecting arm (201), one end of the second cylinder (304) is movably connected with the lower surface of the first connecting arm (201), the other end of the second cylinder (304) is movably connected with the lower surface of the second connecting arm (202), one end of the third cylinder (307) is movably connected with the upper surface of the second connecting arm (202), the other end of the third cylinder (307) is movably connected with the upper surface of the third connecting arm (203), the number of the fourth cylinder (310) is two, two fourth cylinders (310) are arranged on the left and right side walls of the third connecting arm (203), and the other ends of the two fourth cylinders (310) are movably connected with the outer surfaces of the two flexible arc plates (402).

2. The casing centralizer of claim 1, wherein: The derrick (1) comprises a derrick main body (101), the side surface of the derrick main body (101) is fixedly connected with a first fixed seat (102), the surface of the first fixed seat (102) is fixedly connected with a first connecting frame (103), and the other end of the first connecting arm (201) is movably connected with the first connecting frame (103).

3. A downhole oil casing centralizer according to claim 2, characterized in that: The side surface of the derrick main body (101) is fixedly connected with a second fixed seat (104), the second fixed seat (104) is located above the first fixed seat (102), the surface of the second fixed seat (104) is fixedly connected with a second connecting frame (105), and the other end of the first cylinder (301) is movably connected with the second connecting frame (105).

4. The under-reaming centralizing device of claim 1, wherein: The surface of the first cylinder (301) is fixedly connected with an A1 gas inlet (302), the surface of the first cylinder (301) is fixedly connected with an A2 gas inlet (303), and the A2 gas inlet (303) is located below the A1 gas inlet (302).

5. The under-reaming centralizing device of claim 1, wherein: The surface of the second cylinder (304) is fixedly connected with a B1 gas inlet (305), the surface of the second cylinder (304) is fixedly connected with a B2 gas inlet (306), and the B2 gas inlet (306) is located on the right side of the B1 gas inlet (305).

6. The under-reaming centralizing device of claim 1, wherein: The surface of the third cylinder (307) is fixedly connected with a C1 gas conveying hole (308), and the surface of the third cylinder (307) is fixedly connected with a C2 gas conveying hole (309), which is located at the right side of the C1 gas conveying hole (308).

7. The under-reaming centralizing device of claim 1, wherein: The surface of the fourth cylinder (310) is fixedly connected with a D1 gas conveying hole (311), and the surface of the fourth cylinder (310) is fixedly connected with a D2 gas conveying hole (312), which is located at the side of the D1 gas conveying hole (311) away from the third connecting arm (203).

8. The under-reaming centralizing device of claim 1, wherein: The inner surface of the flexible arc plate (402) is provided with a clamping groove (403), a single-end pin (404) is installed in the clamping groove (403), the number of the single-end pin (404) is multiple, a spring (405) is sleeved on the outer surface of the single-end pin (404), a bearing (406) is sleeved on the outer surface of the single-end pin (404), and the bearing (406) is located below the spring (405).

9. A method of using a drill workover casing centralizer, comprising: The method comprises the following steps: Step one, install the first fixed seat (102), the second fixed seat (104) and the derrick main body (101), check and adjust the specification of the flexible arc plate (402) to match the current pipe column specification; Step two, connect the gas conveying holes on the third cylinder (307), let the gas flow into the C1 gas conveying hole (308) and discharge from the C2 gas conveying hole (309), the piston rod of the third cylinder (307) moves, and the third connecting arm (203) is pushed out; Step three, connect the gas conveying holes on the second cylinder (304), let the gas flow into the B1 gas conveying hole (305) and discharge from the B2 gas conveying hole (306), the piston rod of the second cylinder (304) moves, and the second connecting arm (202) is pushed out; Step four, connect the gas conveying holes on the first cylinder (301), let the gas flow into the A1 gas conveying hole (302) and discharge from the A2 gas conveying hole (303), the piston rod of the first cylinder (301) moves, and the first connecting arm (201) is pushed out; Step five, connect the gas conveying holes on the fourth cylinder (310), let the gas flow into the D1 gas conveying hole (311) and discharge from the D2 gas conveying hole (312), the piston rod of the fourth cylinder (310) moves, and the deflection angle of the flexible arc plate (402) is adjusted; Step six, according to the casing inclination angle, the casing is righted by operating each gas cylinder.

Images