CN215927290U

CN215927290U - Large-displacement screw drill

Info

Publication number: CN215927290U
Application number: CN202121296632.9U
Authority: CN
Inventors: 杨全枝; 侯云翌
Original assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Current assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-03-01
Anticipated expiration: 2031-06-10

Abstract

The utility model relates to a large-displacement screw drill, which comprises a sleeve; the anti-drop device also comprises a bypass valve shell, an anti-drop assembly, a rubber stator, a rotor, a universal shaft and a transmission shaft which are connected in sequence; the upper end of the bypass valve shell is connected with an upper joint, and the lower end of the transmission shaft is connected with a lower joint; a bypass valve core, a spring and a spring seat are sequentially arranged in the bypass valve shell from top to bottom, and a first bypass hole and a second bypass hole are sequentially arranged in the bypass valve shell from top to bottom in the radial direction; a bypass valve core hole is arranged on the bypass valve core in the radial direction, and a bypass valve central flow passage is arranged in the center of the bypass valve core; the bypass valve shell, the anti-drop assembly, the rubber stator, the rotor and the universal shaft are positioned in the sleeve; an annular channel is formed among the sleeve, the bypass valve shell, the anti-drop assembly, the rubber stator, the rotor and the universal shaft; the annular passage is in communication with the internal flow passage of the cardan shaft. The utility model has simple structure and convenient use, and can satisfy the requirement of adopting large-discharge well washing in the drilling process of highly deviated wells and horizontal wells.

Description

Large-displacement screw drill

Technical Field

The utility model belongs to the technical field of well drilling, and particularly relates to a large-displacement screw drill.

Background

The screw drilling tool is a positive displacement downhole power drilling tool which takes drilling fluid as power and converts the pressure energy of the fluid into mechanical energy. When slurry pumped by the slurry pump flows through the bypass valve and enters the motor, a certain pressure difference is formed between the inlet and the outlet of the motor, the rotor is pushed to rotate around the axis of the stator, and the rotating speed and the torque are transmitted to the drill bit through the universal shaft and the transmission shaft, so that the drilling operation is realized.

The high-inclination well and the horizontal well need the well washing of big discharge capacity in order to do benefit to and clear away the rock debris in the pit at the well drilling in-process, because the rotational speed and the work discharge capacity of screw rod drilling tool are directly proportional, increase the rotational speed of discharge capacity increase rotor, cardan shaft, transmission shaft certainly, the increase by a wide margin of discharge capacity can lead to the improper work of screw rod drilling tool, causes the damage easily. The rated displacement of the solid rotor of the conventional screw drill is small, while the hollow rotor can increase a certain displacement, but simultaneously, the overload resistance of the hollow rotor is low and the water power utilization rate is low because the hollow rotor is hollow.

Disclosure of Invention

Aiming at the problems, the utility model aims to provide a high-displacement screw drill tool, which can be used for shunting drilling fluid flowing through a screw by controlling the switch of a double-channel bypass valve, so that the screw drill tool can work normally and simultaneously can meet the requirement of adopting high-displacement well flushing in the drilling process of a high-inclination well and a horizontal well.

The technical scheme of the utility model is as follows:

a large displacement screw drill comprises a sleeve; the anti-drop device also comprises a bypass valve shell, an anti-drop assembly, a rubber stator, a rotor, a universal shaft and a transmission shaft which are connected in sequence; the upper end of the bypass valve shell is connected with an upper joint, and the lower end of the transmission shaft is connected with a lower joint; a bypass valve core, a spring and a spring seat are sequentially arranged in the bypass valve shell from top to bottom, and a first bypass hole and a second bypass hole are sequentially arranged in the bypass valve shell from top to bottom in the radial direction; a bypass valve core hole is arranged on the bypass valve core in the radial direction, and a bypass valve central flow passage is arranged in the center of the bypass valve core; the bypass valve shell, the anti-drop assembly, the rubber stator, the rotor and the universal shaft are positioned in the sleeve; an annular channel is formed among the sleeve, the bypass valve shell, the anti-drop assembly, the rubber stator, the rotor and the universal shaft; the annular passage is in communication with the internal flow passage of the cardan shaft.

And a one-way valve is arranged between the annular channel and the inner flow passage of the universal shaft.

And the sleeve and the universal shaft are sealed by a sealing ring.

The upper joint and the lower joint are both of a drill rod female buckle type.

The utility model has the technical effects that:

the large-displacement screw drill tool is simple in structure and convenient to use, and by controlling the switch of the two-channel bypass valve, drilling fluid flowing through the screw is shunted, so that the screw drill tool can work normally, and the requirement that a large-displacement well is adopted for flushing a large-displacement well in the drilling process of a high-inclination well and a horizontal well is met.

Drawings

FIG. 1 is a schematic view of a large displacement screw drill according to the present invention.

Reference numerals: 1. an upper joint; 2. a bypass valve housing; 3. a sleeve; 4. a bypass spool bore; 5. a first bypass hole; 6. an annular channel; 7. a bypass valve center flow passage; 8. a second bypass hole; 9. a spring; 10. a spring seat; 11. a bypass spool; 12. an anti-drop assembly; 13. a rubber stator; 14. a rotor; 15. a cardan shaft; 16. a one-way valve; 17. a seal ring; 18. a drive shaft; 19. and a lower joint.

Detailed Description

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

Example 1

A large displacement screw drill comprises a sleeve 3; the anti-dropping device also comprises a bypass valve shell 2, an anti-dropping assembly 12, a rubber stator 13, a rotor 14, a universal shaft 15 and a transmission shaft 18 which are connected in sequence; the upper end of the bypass valve shell 2 is connected with an upper joint 1, and the lower end of the transmission shaft 18 is connected with a lower joint 19; a bypass valve core 11, a spring 9 and a spring seat 10 are sequentially arranged in the bypass valve shell 2 from top to bottom, and a first bypass hole 5 and a second bypass hole 8 are sequentially arranged in the radial direction from top to bottom; a bypass valve core hole 4 is arranged on the bypass valve core 11 in the radial direction, and a bypass valve central flow passage 7 is arranged in the center of the bypass valve core 11; the bypass valve shell 2, the anti-drop assembly 12, the rubber stator 13, the rotor 14 and the universal shaft 15 are positioned in the sleeve 3; an annular channel 6 is formed among the sleeve 3, the bypass valve shell 2, the anti-drop assembly 12, the rubber stator 13, the rotor 14 and the universal shaft 15; the annular passage 6 communicates with the internal flow passage of the cardan shaft 15.

Example 2 Normal Displacement drilling fluid

A large displacement screw drill tool is characterized in that a lower connector 19 is directly connected with a drill bit, an upper connector 1 is connected with a drill string, a bypass valve core hole 4 is communicated with a first bypass hole 5 during drilling, a bypass valve central flow passage 7, the bypass valve core hole 4, the first bypass hole 5 and an annular passage 6 form a passage, when drilling is carried out, a flow passage is narrowed when drilling fluid passes through the bypass valve central flow passage 7, the drilling fluid pushes a bypass valve core 11 to move downwards, a spring 9 is compressed, and the drilling fluid sequentially enters an anti-dropping assembly 12, a rubber stator 13, a rotor 14 and a driving rotor 14 through the bypass valve central flow passage 7.

Example 3 high Displacement drilling fluid

When a high-displacement well is needed to be washed in the drilling process of a high-inclination well and a horizontal well, the discharge capacity of the drilling fluid is increased, the drilling fluid continues to push the bypass valve core 11 to move downwards, the discharge capacity continues to be increased when the rated discharge capacity of the screw drill is reached, the bypass valve core hole 4 is communicated with the second bypass hole 8 of the bypass valve core 11, the drilling fluid is shunted at the moment, and the flow exceeding the rated discharge capacity enters a flow channel space of the universal shaft 15 from the second bypass hole 8 through the annular channel 6, so that the rubber stator 13 and the rotor 14 are prevented from being damaged by the overload of the discharge capacity of the drilling fluid, and meanwhile, the drill bit is ensured to obtain the required high-displacement drilling fluid to finish the work of cleaning the bottom of the well.

Example 4

And a sealing ring 17 is used for sealing between the sleeve 3 and the universal shaft 15. The upper joint 1 and the lower joint 19 are both of a drill rod female buckle type. A one-way valve 16 is arranged between the annular channel 6 and the inner flow passage of the cardan shaft 15. In embodiment 3, a flow exceeding the rated displacement flows from the second bypass opening 8 through the annular channel 6, the non-return valve 16 and into the flow passage space of the cardan shaft 15.

Claims

1. A large displacement screw drill, comprising a sleeve (3); the method is characterized in that: the anti-dropping device also comprises a bypass valve shell (2), an anti-dropping assembly (12), a rubber stator (13), a rotor (14), a universal shaft (15) and a transmission shaft (18) which are connected in sequence; the upper end of the bypass valve shell (2) is connected with the upper joint (1), and the lower end of the transmission shaft (18) is connected with the lower joint (19);

a bypass valve core (11), a spring (9) and a spring seat (10) are sequentially arranged in the bypass valve shell (2) from top to bottom, and a first bypass hole (5) and a second bypass hole (8) are sequentially arranged in the radial direction from top to bottom; a bypass valve core hole (4) is arranged in the radial direction of the bypass valve core (11), and a bypass valve central flow passage (7) is arranged in the center of the bypass valve core (11); the bypass valve shell (2), the anti-drop assembly (12), the rubber stator (13), the rotor (14) and the universal shaft (15) are positioned in the sleeve (3); an annular channel (6) is formed among the sleeve (3), the bypass valve shell (2), the anti-drop assembly (12), the rubber stator (13), the rotor (14) and the universal shaft (15); the annular channel (6) is in communication with the internal flow passage of the cardan shaft (15).

2. A large displacement screw drill according to claim 1, wherein: a one-way valve (16) is arranged between the annular channel and an internal flow passage of the universal shaft (15).

3. A large displacement screw drill according to claim 2, wherein: and a sealing ring (17) is used for sealing between the sleeve (3) and the universal shaft (15).

4. A large displacement screw drill according to claim 3, wherein: the upper joint (1) and the lower joint (19) are both of a drill rod female buckle type.