CN202417348U - Anti-dropping device of drilling tool - Google Patents

Abstract

The utility model relates to an anti-dropping device for drilling tools used in drilling operations in oil and gas fields. It can prevent the drilling tool from being sheared and falling into the well under special circumstances. The technical solution is: the anti-dropping device is a metal outer shell, and slips are arranged in the cavity, the inner side of the slips is an arc surface with slip teeth, and the outer side is a vertical surface, which is connected with the inclined block; the inclined surface of the inclined block is provided with an inclined block The roller is connected to the inclined block connecting plate on the inclined block, and the inclined block connecting plate is connected to the bottom of the hydraulic cylinder; the external of the hydraulic cylinder is connected to the inserting plate horizontally, and the inserting plate is installed with fastening bolts; the lower part of the hydraulic cylinder is equipped with a lower oil inlet hole The upper part is provided with an upper oil inlet pipe, and an overflow device is installed in the pipe, and the overflow device is connected with the hydraulic pipeline. The device uses a hydraulic cylinder to provide thrust to clamp the slips and clamp the drilling tool; during normal drilling, the hydraulic cylinder goes up to release the slips. The anti-falling device has the advantages of simple structure, stable performance and reliable construction method, can reduce drilling tool fishing cost, and can be used in drilling operations in oil and gas fields.

Description

An anti-drop device for drilling tools

technical field

The utility model relates to an anti-dropping device for drilling tools used in drilling operations in oil and gas fields, which belongs to the field of oil and natural gas exploitation.

Background technique

In the process of exploiting oil and natural gas, in order to achieve the purpose of safe production, it is necessary to install a blowout preventer on the wellhead casing head. When an emergency occurs, the blowout preventer cuts off the drilling tool and closes the wellhead to prevent blowout out of control accidents. However, the drilling tool will fall into the well after being cut off, which is very difficult to salvage. In order to facilitate the handling of accidents and reduce economic losses, the drilling tool during blowout is "captured" before breaking, so that the "fish head" remains on the ground. It is not only convenient to kill the well, but also convenient to salvage the drilling tool. This device was invented for this purpose.

Contents of the invention

The purpose of this utility model is: in order to prevent the drilling tool from falling into the well after being cut off in special circumstances, a device for preventing the drilling tool from falling is provided.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a drilling tool anti-falling device, which is composed of an outer shell, slips, inclined blocks, inclined block connecting plates, fastening bolts, inserting tight plates, and lower oil inlet pipes , upper oil inlet pipe, hydraulic cylinder, overflow device and hydraulic pipeline. Its structural features are: the device is a metal outer shell with a large cavity inside. There are arc shoulders on both sides of the lower part of the cavity. A slope with a slope of 60o-80o is cut on the shoulder; the slope is matched with a slope block with a slope block roller, the vertical surface of the slope block is connected with the slips, and the top of the slope block is connected with the slope block connecting pull; the inside of the slip is a belt The arc surface of the slip tooth, the outside of the slip is a vertical surface, and the slip uses the arc surface to hold the drilling tool tightly; the inclined block connecting plate is connected under the two hydraulic cylinders; There are 4-8 fastening bolts installed on the tight plate; the lower oil inlet pipe is arranged at the lower part of the hydraulic cylinder, the upper oil inlet pipe is arranged at the upper part of the hydraulic cylinder, and an overflow device is arranged in the middle of the upper oil inlet pipe, and the overflow device and the hydraulic pipeline connected.

The working process of the utility model is as follows: two hydraulic cylinders are used to realize the clamping and loosening state of the slips; the movement of the slips is realized by hinges and inclined blocks; space, to ensure the implementation of the drilling process; when an emergency occurs, the hydraulic control system installed in the driller's control room controls the hydraulic piston rod to drive the slips to move downward through the connection mechanism, and moves to the center due to the action of the inclined surface, and the slips on the inner side of the slips The arc surface of the slips is in contact with the drilling tool. Under the action of the thrust of the hydraulic cylinder and the slanting block itself, the slanting block can provide a large lateral positive pressure to the drilling tool, forming self-locking, and clamping the drilling tool; After the blowout accident is dealt with, the drilling tool is lifted up, and the hydraulic control system is operated at the same time, so that the piston rod of the hydraulic cylinder and the slips go up to the empty cut position, and normal production resumes.

The utility model has the following beneficial effects: the drilling tool fall prevention device is installed between the blowout preventer and the wellhead, when the drilling tool is cut off by the blowout preventer, it can hold the falling drilling tool tightly in time, thereby reducing the fishing cost of the drilling tool, Improve oil field production efficiency; the inclination of the slope of this device is 60o ~ 80o, so that under the small thrust of the hydraulic cylinder, a large lateral positive pressure can be obtained, and the inclined block is equipped with rollers to reduce the distance between the inclined block and the inclined surface. of friction. The utility model has the advantages of novel design, simple structure, stable performance and reliable construction method, and can be widely used in drilling operations in oil fields.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the utility model drilling tool falling prevention device. In the figure: 1. Outer casing; 2. Drilling tool; 3. Inclined block; 4. Inclined block roller; 5. Slips; Pipe; 9. Overflow device; 10. Hydraulic pipeline; 11. Fastening bolt; 12. Hydraulic cylinder; 13. Inserting tight plate.

Fig. 2 is a top sectional view of the structure of the utility model drilling tool fall prevention device.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

The inside of the outer casing 1 is a large cavity, and there are arc shoulders on both sides of the lower part of the cavity, and a slope with a slope of 60o to 80o is cut out on the shoulders; Block 3, the vertical surface of inclined block 3 is connected with slip 5, and the top of inclined block 3 is connected with inclined block even pulley 6; the inner side of slip 5 is an arc surface with slip teeth, and slip 4 hugs the drilling tool tightly through the arc surface 2. The slanting block connecting puller 6 is connected under the two hydraulic cylinders 12; the hydraulic cylinder 12 is laterally connected with an inserting plate 13, and 4-8 fastening bolts 11 are installed on the inserting plate 13; The lower oil inlet pipe 7 is provided with an upper oil inlet pipe 8 on the upper part, and an overflow device 9 is arranged in the middle of the upper oil inlet pipe 8, and the overflow device is connected with a hydraulic pipeline 10.

Claims (1)

1. drilling tool falling-proof apparatus; By shell body, slips, skewback, skewback connecting plate, fastening bolt, be seated plate, down the fuel feed hole pipe, go up fuel feed hole pipe, hydraulic cylinder, overflow mechanism and hydraulic line and form; It is characterized in that: device is a metal shell body (1); Inside is a bigger cavity, and there is the circular arc half the circumference of the sleeve where it joins the shoulder both sides, cavity bottom; Cut out the inclined-plane that gradient is 60o～80o on the half the circumference of the sleeve where it joins the shoulder; What match with the inclined-plane is the skewback (3) of a band skewback roller (4), and skewback (3) vertical plane connects slips (5), connects skewback win in succession (6) above the skewback (3); The inboard arc surface of slips (5) for the band slip insert, slips (5) outside is a vertical plane, slips (5) is held drilling tool (2) tightly with arc surface; Skewback connecting plate (6) is connected below two hydraulic cylinders (12); Hydraulic cylinder (12) outside is horizontally connected with and is seated plate (13), is seated 4-8 fastening bolt (11) is installed on the plate (13); In hydraulic cylinder (12) bottom fuel feed hole pipe (7) down is set, hydraulic cylinder (12) top is provided with fuel feed hole pipe (8), is provided with overflow mechanism (9) in the middle of the last fuel feed hole pipe (8), and overflow mechanism (9) is connected with hydraulic line (10).

Images