CN116411835A - Large diameter reverse circulation drilling rotary sealing device - Google Patents

Abstract

The invention discloses a large-diameter reverse circulation drilling rotary sealing device, which includes a rotating inner cylinder. The outer side and upper part of the rotating inner cylinder are provided with an upper rotating chamber of the inner cylinder along its circumferential direction, and the lower part is provided with a lower rotating chamber of the inner cylinder along its circumferential direction. The inner cylinder is covered with an outer cylinder, and the inner and upper parts of the outer cylinder are provided with an upper fixed cavity of the outer cylinder along its circumferential direction, and the lower part is provided with a lower fixed cavity of the outer cylinder along its circumferential direction, and the upper rotating cavity of the inner cylinder and the upper fixed cavity of the outer cylinder are formed correspondingly. The flowback mud chamber, the lower rotating chamber of the inner cylinder and the lower fixed chamber of the outer cylinder correspond to form a compressed gas chamber, and the outer side of the outer cylinder corresponds to the position of the upper fixed chamber of the outer cylinder. An air inlet is set at the position, and an opening is set at the corresponding position of the discharge flange. Compared with the traditional circulation drilling device, the rotary sealing device of the present invention has the characteristics of improving the flowback efficiency of drilling fluid and mud, and further improving the operating efficiency of reverse circulation drilling.

Description

Large diameter reverse circulation drilling rotary sealing device

technical field

The invention belongs to the technical field of oil and gas exploitation equipment, and relates to a large diameter reverse circulation drilling rotary sealing device.

Background technique

In reverse circulation drilling, the drilling fluid flows in from the annulus of the wellbore and returns out through the inner hole of the drill bit and drilling tool. The reverse circulation drilling technology has the advantages of reducing formation loss and protecting oil and gas layers. The large-diameter reverse circulation drilling rotary sealing device of the present invention sends compressed gas into the annular space of the wellbore, and the compressed gas enters the bottom of the drill pipe to form countless small bubbles. The bubbles rise rapidly while expanding to push the fluid into the drill pipe, and the bottom cuttings It is continuously brought to the surface of the reverse circulation rotary sealing device, and finally connected to the grit chamber through the external manifold to complete the reverse circulation operation.

Contents of the invention

The object of the present invention is to provide a large-diameter reverse circulation drilling rotary sealing device, which has the characteristics of improving the flowback efficiency of drilling fluid and mud, thereby improving the efficiency of reverse circulation drilling operations.

The technical solution adopted in the present invention is that the large-diameter reverse circulation drilling rotary sealing device includes a rotating inner cylinder, the outer side and upper part of the rotating inner cylinder are provided with an inner cylinder upper rotating cavity along its circumferential direction, and the lower part is provided with an inner cylinder along its circumferential direction The lower rotating cavity, the rotating inner cylinder is covered with an outer cylinder, the inner and upper parts of the outer cylinder are provided with an upper fixed cavity of the outer cylinder along its circumference, and the lower part is provided with a lower fixed cavity of the outer cylinder along its circumference, the upper rotation cavity of the inner cylinder and the outer cylinder The upper fixed chamber of the outer cylinder corresponds to the flowback mud chamber, the lower rotating chamber of the inner cylinder and the lower fixed chamber of the outer cylinder correspond to the compressed gas chamber, and the outer side of the outer cylinder is provided with a discharge flange at a position corresponding to the upper fixed chamber of the outer cylinder. An air inlet is provided at a position corresponding to the fixed cavity under the cylinder, and an opening is provided at a position corresponding to the discharge flange.

The present invention is also characterized in that:

A rotating dynamic sealing ring b is provided at a position corresponding to the contact surface of the rotating inner cylinder and the outer cylinder, and the rotating dynamic sealing ring b is respectively arranged at both ends of the compressed gas chamber.

Bearings are arranged between the rotating inner cylinder and the outer cylinder, and the bearings are respectively arranged at two ends of the outer cylinder.

The position corresponding to the contact surface of the rotating inner cylinder and the outer cylinder is provided with a rotating dynamic sealing ring a and a guide belt, and the rotating dynamic sealing ring a and the guiding belt are between the bearing and the flowback mud chamber; the corresponding contact surface of the rotating inner cylinder and the outer cylinder The position is provided with a rotating dynamic sealing ring a, and the rotating dynamic sealing ring a is between the flowback mud chamber and the compressed gas chamber.

The two ends of the rotating inner cylinder and the positions corresponding to the bearings respectively fix the inner gland by bolts b.

The inner sealing gasket is used for sealing between the rotating inner cylinder and the inner gland.

At the end face of the same end of the outer cylinder and the discharge flange, and the corresponding position of the inner gland, the upper outer gland is fixed by bolt c, and the lower outer gland is fixed by the bolt c at the end face of the outer cylinder and the same end of the intake pipe, and the corresponding position of the inner gland .

Between the outer cylinder and the upper outer gland, and between the outer cylinder and the lower outer gland are respectively sealed by outer sealing gaskets.

Between the inner gland and the upper outer gland, and between the inner gland and the lower outer gland are respectively sealed by dust-proof seals.

Lifting lugs are arranged on the upper outer gland.

The beneficial effects of the present invention are:

(1) The rotary sealing device of the present invention can send compressed air into the annulus of the wellbore, accelerate and drive the bottom hole mud and cuttings from the bottom of the well to the drill pipe and flow back to the ground reverse circulation rotary sealing device, and finally pass through the external manifold Connected to the grit chamber, compared with the traditional circulation drilling process, the reverse circulation drilling uses fewer drilling tools, and the reverse circulation drilling process can be completed under the support of the double-arm drill pipe, which improves the efficiency of the drilling fluid and mud flowback, thereby improving the reverse circulation. drilling efficiency.

(2) The rotary sealing device of the present invention is one of the key components of the reverse circulation drilling process. Air is used as the reverse circulation medium, and the air enters the bottom of the drill pipe to form numerous small bubbles. After cuttings, drilling slag, drilling fluid and air are mixed, A mixture with a lower density than the drilling fluid is formed, and then driven by pressure, the internal circulation of the drill pipe is triggered, and the drilling fluid mud carrying cuttings flows back upwards from the drill pipe and enters the internal passage of the reverse circulation rotary sealing device, and the mixture is discharged from the bottom of the well. It is brought out that compared with the traditional circulation drilling process, reverse circulation drilling uses fewer drilling tools, and the reverse circulation drilling process can be completed under the support of the double-arm drill pipe to improve the efficiency of drilling operations.

(3) The rotary sealing device of the present invention mainly includes three parts: a rotating part, a sealing part and a fixed part. The rotating part includes a rotating cavity: the upper rotating cavity 21 of the inner cylinder and the lower rotating cavity 23 of the inner cylinder, and the fixed part includes a fixed cavity: the upper fixing cavity 20 of the outer cylinder and the lower fixing cavity 22 of the outer cylinder. The ratio of the area of the fluid channel, the gas rotating chamber and the fixed chamber to the area of the air inlet is greater than 10, which ensures that the inner cylinder reduces the generation of back pressure during the rotation process and ensures the smooth operation of the gas, thereby greatly improving the efficiency of compressed gas feeding; backflow The ratio of the area of the mud rotating chamber and the fixed chamber to the area of the discharge flange is greater than 10, which ensures that the inner cylinder reduces back pressure during the rotation process and ensures that the mud can run smoothly, thereby greatly improving the drilling fluid mud discharge efficiency.

(4) The rotary sealing device of the present invention can be provided with one or more air inlets according to the requirements of reverse circulation drilling operations, so as to accelerate the flowback efficiency of drilling fluid and mud.

(5) The inner diameter of the rotary sealing device of the present invention is large, and one or more flanges can be designed on the outer cylinder according to the displacement requirements of mud and drilling fluid.

Description of drawings

Fig. 1 is a structural schematic diagram of a large diameter reverse circulation drilling rotary sealing device of the present invention;

Fig. 2 is a partial enlarged view of I in the rotary sealing device of the present invention;

Fig. 3 is a partially enlarged view of II in the rotary sealing device of the present invention;

Fig. 4 is a partial enlarged view of III in the rotary sealing device of the present invention;

Fig. 5 is an application scene diagram of the rotary sealing device of the present invention;

Fig. 6 is a schematic diagram of the principle of the rotary sealing device of the present invention.

In the figure, 1. Lifting lug, 2. Bolt a, 3. Rotating inner cylinder, 4. Bolt b, 5. Dustproof seal, 6. Bearing, 7. Bolt c, 8. Upper and outer gland, 9. Discharge method Lan, 10. outer cylinder, 11. air inlet, 12. inner gland, 13. lower outer gland, 14. connecting pipe, 15. inner sealing gasket, 16. outer sealing gasket, 17. rotating dynamic sealing ring a , 18. Guide belt, 19. Rotating dynamic sealing ring b, 20. Upper fixed chamber of outer cylinder, 21. Upper rotating chamber of inner cylinder, 22. Lower fixed chamber of outer cylinder, 23. Lower rotating chamber of inner cylinder, 24. Top drive , 25. Drill pipe, 26. Drill pipe side pipe, 27. Flowback mud, 28. Compressed gas.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The structure of the large-diameter reverse circulation drilling rotary sealing device of the present invention is shown in Figure 1, including a rotating inner cylinder 3, the outer side and upper part of the rotating inner cylinder 3 are provided with an inner cylinder upper rotating cavity 21 along its circumferential direction, and the lower part is provided along its circumferential direction There is a lower rotating chamber 23 of the inner cylinder, the upper rotating chamber 21 of the inner cylinder is a passage for drilling fluid mud, the lower rotating chamber 23 of the inner cylinder is a passage for compressed gas, the rotating inner cylinder 3 is covered with an outer cylinder 10, and the inner side and upper part of the outer cylinder 10 are along its The upper fixed chamber 20 of the outer cylinder is arranged in the circumferential direction, and the lower fixed chamber 22 of the outer cylinder is arranged in the lower part along the circumferential direction. 23 and the lower fixed chamber 22 of the outer cylinder correspond to form a compressed gas chamber, and both the flowback mud chamber and the compressed gas chamber are intact fluid chambers, which are conducive to reducing the generation of back pressure and ensuring the smooth entry and exit of fluid. A discharge flange 9 is provided at a position corresponding to the fixed chamber 20 on the outer cylinder, an air inlet 11 is provided at a position corresponding to the lower fixed chamber 22 of the outer cylinder, and an opening is provided at a position corresponding to the discharge flange 9 . Bearings 6 are arranged between the rotating inner cylinder 3 and the outer cylinder 10 , and the bearings 6 are respectively arranged at both ends of the outer cylinder 10 . The function of the bearing 6 is to straighten and prevent eccentricity when the rotating inner cylinder 3 rotates, while ensuring smooth rotation. The bearing 6 mainly bears axial loads and certain radial loads. The two ends of the rotating inner cylinder 3 and the positions corresponding to the bearing 6 are respectively fixed with the inner gland 12 by bolts b4. At the end face of the same end of the outer cylinder 10 and the discharge flange 9, and at the corresponding position of the inner gland 12, the upper outer gland 8 is fixed by the bolt c7, and the upper outer gland 8 is provided with a lifting lug 1; the outer cylinder 10 is the same as the intake pipe 11 At the end face of the end and the corresponding position of the inner gland 12, the lower outer gland 13 is fixed by the bolt c7. Between the inner gland 12 and the upper outer gland 8, and between the inner gland 12 and the lower outer gland 13, respectively, are sealed by a dustproof seal 5, and the main function of the dustproof seal 5 is to prevent external dust from entering the inside.

As shown in Figure 2, the local enlarged view of I in the rotary sealing device of the present invention is sealed by an inner sealing washer 15 between the rotating inner cylinder 3 and the inner gland 12, and the inner sealing washer 15 can effectively prevent grease between the upper and lower bearings 6. Give way. Between the outer cylinder 10 and the upper outer gland 8 , and between the outer cylinder 10 and the lower outer gland 13 are respectively sealed by outer sealing gaskets 16 . A rotary dynamic sealing ring a17 and a guide belt 18 are provided at the corresponding positions of the contact surfaces of the rotating inner cylinder 3 and the outer cylinder 10, and the rotating dynamic sealing ring a17 and the guiding belt 18 are between the bearing 6 and the flowback mud chamber.

The partial enlarged view of II in the rotary sealing device of the present invention is shown in Fig. 3, the position corresponding to the contact surface of the rotating inner cylinder 3 and the outer cylinder 10 is provided with a rotating dynamic sealing ring a17, and the rotating dynamic sealing ring a17 is in the flowback mud chamber and compression between gas chambers. The rotating dynamic sealing ring a17 is used to seal the flowback mud cavity and prevent the drilling fluid in the cavity from leaking. Among them, the rotating dynamic sealing ring a17 uses two seals.

The partial enlarged view of III in the rotary sealing device of the present invention is shown in Figure 4, the position corresponding to the contact surface of the rotating inner cylinder 3 and the outer cylinder 10 is provided with a rotating dynamic sealing ring b19, and the rotating dynamic sealing ring b19 is at both ends of the compressed gas chamber Set separately. The rotating dynamic sealing ring b19 is used to seal the compressed gas chamber to prevent leakage of the compressed gas in the chamber. Among them, the rotating dynamic sealing ring b19 uses two seals.

The application scene diagram of the rotary sealing device of the present invention is shown in Figure 5. The top of the rotating inner cylinder 3 is connected to the top drive 24 through the bolt a2, and the bottom is connected to the drill pipe 25 through the bolt a2, and the rotating inner cylinder 3 is driven to rotate by the top drive 24.

The schematic diagram of the principle of the rotary sealing device of the present invention is shown in Figure 6. A drill pipe side pipe 26 is arranged inside the drill pipe 25, and the drill pipe side pipe 26 communicates with the lower rotating chamber 23 of the inner cylinder through the connecting pipe 14, and the compressed gas 28 is supplied by The outside world enters the lower fixed chamber 22 of the outer cylinder 10 through the air inlet 11, and then enters the side pipe 26 of the drill pipe through the lower rotating chamber 23 and the connecting pipe 14 of the inner cylinder in sequence, and finally enters the bottom of the well. The injection of compressed gas 28 helps to accelerate the upward flowback of flowback mud 27 . The flowback mud 27 enters the flowback mud cavity through the inner channel of the rotary sealing device, and then is discharged through the discharge flange 9, and is connected to the grit chamber through the external connection pipe.

The reverse circulation drilling rotary sealing device of the present invention mainly includes three parts: a rotating part, a sealing part and a fixed part. The rotating part includes a rotating cavity, and the fixed part includes a fixed cavity. There is a fluid channel between the rotating part and the fixed part, and the sealing part seals the fluid to prevent fluid leakage. The rotating part is mainly composed of a rotating inner cylinder 3 and an inner gland 12. The rotating inner cylinder 3 is connected under the top drive 24, and the rotating inner cylinder 3 is driven to rotate by the top drive 24. The fixed part consists of an outer cylinder 10, an upper outer gland 8, The lower outer gland 13, the air inlet 11 and the discharge flange 9 are composed, and are kept fixed during work. The sealing between the rotating inner cylinder 3 and the outer cylinder 10 is realized by a rotating seal.

The working process of the large diameter reverse circulation drilling rotary sealing device of the present invention is as follows:

The compressed gas 28 enters the compressed gas cavity from the outside through the air inlet 11, and then enters the side pipe 26 of the drill pipe through the connecting pipe 14, and finally enters the bottom of the well. The injection of compressed gas 28 makes the flowback mud 27 at the bottom of the well enter the internal passage of the rotating inner cylinder 3, pass through the internal passage of the rotating inner cylinder 3 to reach the flowback mud cavity, and finally discharge to the ground through the discharge flange 9, and pass through the external manifold Access to the grit chamber.

The main function of the large-diameter reverse circulation drilling rotary sealing device of the present invention is to transmit the compressed air to the bottom of the well through the reverse circulation drilling rotary sealing device connected to the side pipe of the drill pipe. Fluid mud flows back upwards from the drill pipe, and the flowback drilling fluid mud enters the internal passage of the reverse circulation rotary sealing device, enters the cavity formed by the inner cylinder and the outer cylinder from the internal passage, and finally connects to the external manifold through the flange Among them, the flowback efficiency of drilling fluid and mud can be improved, and then the efficiency of reverse circulation drilling operation can be improved.

Claims (10)

1. Large-diameter reverse circulation drilling rotary sealing device, characterized in that it includes a rotating inner cylinder (3), the outer side and upper part of the rotating inner cylinder (3) is provided with an inner cylinder upper rotating chamber (21) along its circumference, and the lower part An inner cylinder lower rotating cavity (23) is provided along its circumference, and an outer cylinder (10) is overlaid on the rotating inner cylinder (3), and an outer cylinder is arranged on the inner side and upper part of the outer cylinder (10) The upper fixed chamber (20), the lower part is provided with the lower fixed chamber (22) of the outer cylinder along its circumference, the upper rotating chamber (21) of the inner cylinder and the upper fixed chamber (20) of the outer cylinder correspond to form a flowback mud chamber, so The lower rotating chamber (23) of the inner cylinder and the lower fixed chamber (22) of the outer cylinder correspond to form a compressed gas chamber, and the outer side of the outer cylinder (10) and the position corresponding to the upper fixed chamber (20) of the outer cylinder are provided with a discharge method. Flange (9), an air inlet (11) is provided at a position corresponding to the lower fixed cavity (22) of the outer cylinder, and an opening is provided at a position corresponding to the discharge flange (9). 2. The rotary sealing device according to claim 1, characterized in that, a rotary dynamic seal ring b (19) is provided at a position corresponding to the contact surface of the rotary inner cylinder (3) and the outer cylinder (10), and the rotary dynamic seal ring b (19) Sealing rings b (19) are respectively arranged at both ends of the compressed gas chamber. 3. The rotary sealing device according to claim 1, characterized in that, a bearing (6) is arranged between the rotating inner cylinder (3) and the outer cylinder (10), and the bearing (6) is mounted on the outer cylinder (10) Both ends are set separately. 4. The rotary sealing device according to claim 3, characterized in that a rotary dynamic sealing ring a (17) and a guide belt (18) are provided at the corresponding positions of the contact surfaces of the rotary inner cylinder (3) and the outer cylinder (10) ), the rotating dynamic sealing ring a (17) and the guide belt (18) are between the bearing (6) and the flowback mud chamber; the position corresponding to the contact surface of the rotating inner cylinder (3) and the outer cylinder (10) A rotating dynamic sealing ring a (17) is provided, and the rotating dynamic sealing ring a (17) is between the flowback mud chamber and the compressed gas chamber. 5. The rotary sealing device according to claim 3, characterized in that the positions corresponding to the bearings (6) at the two ends of the rotary inner cylinder (3) are respectively fixed by bolts b (4) to the inner gland (12 ). 6 . The rotary sealing device according to claim 5 , characterized in that, the internal sealing gasket ( 15 ) seals between the rotary inner cylinder ( 3 ) and the inner gland ( 12 ). 7. The rotary sealing device according to claim 5, characterized in that, at the end face of the same end of the outer cylinder (10) and the discharge flange (9), the corresponding position of the inner gland (12) is passed through the bolt c (7) Fix the upper outer gland (8), the end face of the outer cylinder (10) and the same end of the air intake pipe (11), and the corresponding position of the inner gland (12), fix the lower outer gland (13) by bolt c (7) . 8. The rotary sealing device according to claim 7, characterized in that, between the outer cylinder (10) and the upper outer gland (8), and between the outer cylinder (10) and the lower outer gland (13), respectively Sealed by the outer sealing gasket (16). 9. The rotary sealing device according to claim 7, characterized in that, between the inner gland (12) and the upper outer gland (8), between the inner gland (12) and the lower outer gland (13) The spaces are respectively sealed by dust-proof seals (5). 10. The rotary sealing device according to any one of claims 7-9, characterized in that, the upper and outer glands (8) are provided with lifting lugs (1).

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