CN108979570B

CN108979570B - Well bottom drilling fluid energizer

Info

Publication number: CN108979570B
Application number: CN201810787063.4A
Authority: CN
Inventors: 刘仕华; 龚锦程; 张辉耀; 刘建生; 张靖柯; 唐鹏; 肖仕红
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2018-07-15
Filing date: 2018-07-15
Publication date: 2021-05-07
Anticipated expiration: 2038-07-15
Also published as: CN108979570A

Abstract

The invention relates to a bottom hole drilling fluid energizer which is used for energizing annular drilling fluid and solving the problem that the drilling fluid is difficult to return to the ground due to excessive flow loss in power intelligent drilling. The energizer comprises an upper short section shell, a lower short section shell, a double-linkage coaxial motor, a blade rotating cylinder, blades, a conical sleeve, a bearing and a sealing device. Go up nipple joint shell and nipple joint shell down and be the coaxial motor shell of dual linkage, its surface mounting has toper sleeve and bearing, and the blade rotary drum is installed outside the bearing, and the blade rotary drum passes through the key to be connected with coaxial motor shaft, and the blade welding is on the blade rotary drum, and sealing device installs in toper sleeve seal ring inslot. The cable supplies power to the double-linkage coaxial motor, so that the double-linkage coaxial motor rotates to drive the rotating shaft of the coaxial motor to rotate, the blade rotating drum is driven to rotate through the key to drive the blades to rotate, and the blades drive the drilling fluid to axially flow and extrude the annular drilling fluid, so that the energization of the drilling fluid at the bottom of the well is realized.

Description

Well bottom drilling fluid energizer

Technical Field

The invention relates to the field of drilling, in particular to a bottom hole drilling fluid energizer which is used for energizing bottom hole drilling fluid and enabling the bottom hole drilling fluid to have enough energy to return to the ground.

Background

In recent years, with the global increase of energy demand, the number and depth of drilled wells are gradually increased, and the difficulty of mining is gradually increased, so that the existing technology cannot meet the requirement of the current drilled wells, and the adoption of more efficient and reliable drilling technology is particularly important. The power intelligent drilling system can realize real-time control and power underground power supply, can greatly reduce the drilling cost of complex wells, deep wells and ultra-deep wells and improve the drilling safety, and is a development direction of the drilling industry.

In the power intelligent drilling operation, the electric drill rod replaces a common drill rod to finish the transmission of drilling fluid and strong electricity, and because cables and other components of the electric drill rod occupy a certain drill rod space, the flow area of the drilling fluid flowing in the drill rod is greatly reduced, so that the lost energy generated in the flowing process of the drilling fluid is greatly increased, the returned energy of the drilling fluid is reduced, and the drilling fluid is even difficult to return to the ground in serious conditions, so that the effective circulation of the drilling fluid cannot be realized, and meanwhile, the stability of a well wall is influenced. In order to solve the problem, the invention provides a bottom hole drilling fluid energizer.

Disclosure of Invention

The purpose of the invention is: the energy of the drilling fluid in the annular space is increased, so that the drilling fluid has enough energy to return to the ground, and the problem that the drilling fluid in the electric drill rod cannot return to the ground due to large energy loss is solved.

In order to achieve the purpose, the invention adopts the technical scheme that:

a well bottom drilling fluid energizer comprises an upper short section shell, a lower short section shell, a double-linkage coaxial motor, a blade rotating cylinder, blades, a tapered sleeve, a bearing and a sealing device, wherein the double-linkage coaxial motor comprises a motor A, a motor B and a coaxial motor rotating shaft. The method is characterized in that: the upper short section shell is a shell of a motor A, and the lower short section shell is a shell of a motor B. The outer surface of the upper short section shell and the outer surface of the lower short section shell are provided with a tapered sleeve and a bearing, the blade rotating drum is arranged outside the bearing and is connected with a rotating shaft of the coaxial motor through a key, the blades are welded on the blade rotating drum, and the sealing device is arranged in a sealing ring groove of the tapered sleeve.

A boss is arranged in the upper short section shell and close to the thread direction, and the boss is used for positioning the motor A and sealing the motor A. And a boss is arranged in the lower short section shell and close to the thread direction, and the boss is used for positioning the motor B and sealing the motor B. Threaded holes are formed in the shells of the upper short section shell and the lower short section shell, and screws are installed at the threaded holes to fix the conical sleeves. The outer surface of one end of the upper pup joint shell is provided with an external thread, and the external thread is in threaded connection with an upper electric drill rod joint; the inner surface of one end of the lower short section shell is provided with an internal thread, and the internal thread is in threaded connection with a lower electric drill rod joint

And the motor A and the motor B share a coaxial motor rotating shaft. A key groove is formed outside the rotating shaft of the coaxial motor and is connected with the blade rotating drum through a key; the coaxial motor rotating shaft is hollow, and the coaxial motor rotating shaft is used for transmitting drilling fluid and placing cables.

The outer surface of the blade rotating drum is welded with a blade, and a key groove is formed in the blade rotating drum.

The invention has the beneficial effects that: 1. simple structure and low manufacturing cost. 2. Compact structure, occupation space is less, has adapted to the narrow and small characteristics in space in the pit. 3. The energizer can adjust the energy supply strength by adding the number of stages of the blades and changing the size of the blades, and has good adaptability. 4 this kind of energizer not only can improve and return drilling fluid energy, and the supplementary drilling fluid returns ground, can also increase drilling fluid annular pressure, guarantees the stability of the wall of a well.

Drawings

Fig. 1 is a diagram of an energizer configuration.

FIG. 2 is a structure diagram of an upper short section housing.

FIG. 3 is a view of the structure of the lower nipple housing.

Fig. 4 is a view showing the structure of a blade drum.

FIG. 5 is a schematic circumferential distribution of blades.

FIG. 6 is a schematic diagram of a powered intelligent drilling bottom hole system.

In the figure: 1. a gasket; 2. a screw; 3. a tapered sleeve; a conical sleeve sealing ring groove; 4. a key; 5. a blade drum; 5a, a key groove of the rotary drum; 6. a lower short section shell; 6a, a lower threaded hole; 6b, a lower boss; 7. a double-linkage coaxial motor; 7a, a motor A; 7B, a motor B; 7c, a coaxial motor rotating shaft; 8. a cable; 9. a sealing device; 10. a blade; 11. a bearing; 12. a sleeve; 13. an upper short section shell; 13a, an upper threaded hole; 13b, upper bosses; 14. a wall of the well supporting machine capable of crawling; 15. a downhole motor; 16. a drill bit; 17. an electric drill rod.

Detailed Description

The present invention is not limited to the following embodiments, and the specific embodiments may be determined according to the technical solution and the practical situation of the present invention. The invention is further described below with reference to the accompanying drawings. The positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.

According to the figure 1, the bottom drilling fluid energizer comprises an upper short section shell 13, a lower short section shell 6, a double-linkage coaxial motor 7, a blade drum 5, blades 10, a conical sleeve 3 and a bearing 11, wherein the double-linkage coaxial motor 7 comprises a motor A7a, a motor B7B and a coaxial motor rotating shaft 7c. The method is characterized in that: the upper short section shell 13 is a shell of a motor A7a, and the lower short section shell 6 is a shell of a motor B7B. Last nipple joint shell 13 and nipple joint shell 6's surface mounting has tapered sleeve 3 and bearing 11 down, and blade rotary drum 5 is installed in bearing 11 outsidely, and blade rotary drum 5 is connected with coaxial motor shaft 7c through key 4, and the welding of blade 10 is on blade rotary drum 5, and sealing device 9 installs in tapered sleeve seal ring groove 3a, prevents that annular space drilling fluid from getting into the closed cavity that last nipple joint shell 13, blade rotary drum 5, nipple joint shell 6 formed down.

According to fig. 1, the motor A7a and the motor B7B share a coaxial motor shaft 7c. A key groove is formed in the outer part of the coaxial motor rotating shaft 7c and is connected with the blade rotating drum 5 through a key 4; the coaxial motor rotating shaft 7c is hollow inside, and the coaxial motor rotating shaft 7c is used for transmitting drilling fluid and placing a cable 8 inside.

According to fig. 1, 2 and 3, the upper nipple housing 13 has an upper boss 13b on the inside in the direction of the approach thread, and the upper boss 13b is used for positioning the motor A7a and sealing the motor A7 a. The lower sub housing 6 has a lower boss 6B on the inside near the thread direction, and the lower boss 6B is used for positioning the motor B7B and the sealing motor B7B. An upper threaded hole 13a is formed in the shell of the upper nipple shell 13, a lower threaded hole 6a is formed in the shell of the lower nipple shell 6, and the conical sleeve 3 is fixed through a mounting screw 2 at the threaded hole.

According to the figures 2, 3 and 6, the outer surface of one end of the upper pup joint shell 13 is provided with external threads, and the external threads are in threaded connection with a joint of an upper electric drill rod 17; the inner surface of one end of the lower short section shell 6 is provided with internal threads, and the internal threads are in threaded connection with a joint of a lower electric drill rod 17.

According to fig. 1 and 4, the blade 10 is welded on the outer surface of the blade drum 5, and the drum keyway 5a is opened inside the blade drum 5. The blade drum 5 is mounted on bearings 11.

According to fig. 5, the blades 10 are welded to the

blade drum

5, and 6 blades 10 are uniformly welded to the blade drum 5 in the circumferential direction.

According to fig. 1, 5 and 6, in the power intelligent drilling, ground electric energy and mud are transmitted into the bottom hole drilling fluid energizer of the invention through the upper electric drill rod 17 and are sequentially transmitted to the lower electric drill rod, the creeping well wall supporting machinery 14 and the downhole motor 15 through the bottom hole drilling fluid energizer; the electric energy drives the underground motor 15 to rotate, and drives the drill bit to rotate to break the rock; the drilling fluid enters the annulus through the downhole motor 15 and the drill bit 16 and is energized by the downhole drilling fluid energizer, thereby smoothly returning to the ground.

The principle of the invention is as follows: according to the figures 1 and 6, the power supply device transmits strong electricity to the double-linkage coaxial motor 7 through the cable 8, so that the motor A7a and the motor B7B rotate in the same direction to drive the rotating shaft 7c of the coaxial motor to rotate together, the blade rotating drum 5 is driven to rotate through the key 4, the blades 10 on the blade rotating drum 5 are driven to rotate, the rotating blades 10 drive drilling fluid to axially flow and extrude the drilling fluid, and therefore energy is transmitted to the annular drilling fluid. Meanwhile, the drilling fluid and the electric energy are also transmitted to the lower electric drill rod through the coaxial motor rotating shaft 7c.

Claims

1. The utility model provides a shaft bottom drilling fluid energizer, includes nipple joint shell, double linkage coaxial motor, blade rotary drum, blade, tapered sleeve, bearing, sealing device down, wherein double linkage coaxial motor includes motor A, motor B and coaxial motor pivot, its characterized in that: the upper short section shell is a shell of a motor A, and the lower short section shell is a shell of a motor B; the outer surfaces of the upper short section shell and the lower short section shell are provided with a tapered sleeve and a bearing, the blade rotating drum is arranged outside the bearing and connected with a rotating shaft of the coaxial motor through a key, the blades are welded on the blade rotating drum, and a sealing device is arranged in a sealing ring groove of the tapered sleeve; the upper short section shell, the blade rotating drum, the lower short section shell, the tapered sleeve, the sealing device and the gasket form a closed cavity; the coaxial motor rotating shaft is hollow, and the drilling fluid and the cable are transmitted inside the coaxial motor rotating shaft; the upper short section shell is in threaded connection with an upper electric drill rod joint, the lower short section shell is in threaded connection with a lower electric drill rod joint, and is sequentially connected with a wall-climbing supporting machine, an underground motor and a drill bit; the power supply device transmits strong electricity to the double-linkage coaxial motor through a cable.

2. A downhole drilling fluid energizer according to claim 1, wherein: a boss is arranged in the upper short section shell and close to the thread direction, and the boss is used for positioning the motor A and sealing the motor A; a boss is arranged in the lower nipple shell and close to the thread direction, and the boss is used for positioning the motor B and sealing the motor B; threaded holes are formed in the shells of the upper short section shell and the lower short section shell, and screws are installed at the threaded holes to fix the conical sleeves.

3. A downhole drilling fluid energizer according to claim 1, wherein: the motor A and the motor B share a coaxial motor rotating shaft; the coaxial motor rotating shaft is externally provided with a key groove and is connected with the blade rotating drum through a key.

4. A downhole drilling fluid energizer according to claim 1, wherein: the outer surface of the blade rotating drum is welded with blades, and a rotating drum key groove is formed in the blade rotating drum.