CN108979570A - A kind of shaft bottom drilling fluid energizer - Google Patents

Abstract

The invention relates to a bottom hole drilling fluid energizer, which is used for increasing the energy of annular drilling fluid and solving the problem that the drilling fluid flow loss is too large and it is difficult to return to the ground in dynamic intelligent drilling. The energizer includes an upper sub-joint housing, a lower sub-joint housing, a double linkage coaxial motor, a vane rotor, vanes, a tapered sleeve, bearings and a sealing device. The casing of the upper sub-section and the casing of the lower sub-section are double-linked coaxial motor casings, and the outer surface of which is installed with a tapered sleeve and bearings. The blade rotor is installed outside the bearing. The blade rotor is connected to the shaft of the coaxial motor through a key. Welded on the blade rotor, the sealing device is installed in the sealing ring groove of the tapered sleeve. The cable supplies power to the double-linkage coaxial motor, which makes the double-linkage coaxial motor rotate, drives the shaft of the coaxial motor to rotate, and then drives the blade drum to rotate through the key, driving the blade to rotate, and the blade will drive the drilling fluid to flow axially and squeeze the annular space Drilling fluid, so as to realize the energization of drilling fluid at the bottom of the hole.

Description

Bottomhole 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 boosting the bottom-hole drilling fluid so that it has enough energy to return to the ground.

Background technique

In recent years, with the increasing demand for energy globally, the number and depth of drilling wells have gradually increased, and the difficulty of mining has also gradually increased. As a result, the existing technology cannot meet the needs of today's drilling. Therefore, it is particularly important to adopt more efficient and reliable drilling technology . The power intelligent drilling system can realize real-time control and power downhole power supply, which can greatly reduce the drilling cost of complex wells, deep wells, and ultra-deep wells and improve drilling safety. It will be the development direction of the drilling industry.

In the power intelligent drilling operation, the electric drill pipe replaces the ordinary drill pipe to complete the transmission of drilling fluid and strong electricity. Since the cable and other parts of the electric drill pipe occupy a certain space of the drill pipe, this greatly reduces the amount of drilling fluid in the drill pipe. The flow-through area during the flow greatly increases the energy lost during the flow of the drilling fluid, which will reduce the return energy of the drilling fluid. In severe cases, it may even be difficult to return to the ground, so that the drilling fluid cannot be effectively circulated. At the same time, it affects the Well wall stability. To solve this problem, a bottomhole drilling fluid energizer was invented.

Contents of the invention

The purpose of the present invention is to increase the energy of the drilling fluid in the annular space so that it has enough energy to return to the ground, so as to solve the problem that the drilling fluid in the electric drill pipe has a large energy loss and cannot return to the ground.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A bottom hole drilling fluid energizer, comprising an upper nipple casing, a lower nipple casing, a double linkage coaxial motor, a vane drum, blades, a tapered sleeve, a bearing, and a sealing device, wherein the double linkage coaxial motor includes Motor A, motor B, and coaxial motor shafts. It is characterized in that: the casing of the upper short joint is the casing of motor A, and the casing of the lower short joint is the casing of motor B. Tapered sleeves and bearings are installed on the outer surfaces of the upper and lower sub casings, and the blade rotor is installed outside the bearing. The blade rotor is connected to the shaft of the coaxial motor through a key, and the blades are welded on the blade rotor. The sealing device is installed in the sealing ring groove of the tapered sleeve.

The casing of the upper nipple has a boss near the thread direction inside, and the boss is used for positioning the motor A and sealing the motor A. The shell of the lower short joint has a boss near the thread direction inside, and the boss is used for positioning the motor B and sealing the motor B. There are threaded holes on the shells of the upper sub-section shell and the lower sub-section shell, and screws are installed in the threaded holes to fix the tapered sleeve. The outer surface of one end of the upper nipple housing is provided with external threads, which are threaded with the upper electric drill pipe joint; the inner surface of one end of the lower nipple housing is provided with internal threads, and the inner thread is threaded with the lower electric drill pipe joint

The motor A and the motor B share a coaxial motor shaft. The shaft of the coaxial motor has a keyway on the outside, and is connected with the blade drum through the key; the shaft of the coaxial motor is hollow inside, and the shaft of the coaxial motor is used to transmit drilling fluid and place cables.

Blades are welded on the outer surface of the blade drum, and key grooves are opened inside.

The beneficial effects of the present invention are: 1. The structure is simple and the manufacturing cost is low. 2. The structure is compact and occupies less space, adapting to the characteristics of small underground space. 3. This kind of energizer can adjust the energy supply intensity by adding the number of blades and changing the size of the blades, and has good adaptability. 4 This kind of energizer can not only increase the energy of the drilling fluid returned to assist the drilling fluid to return to the surface, but also increase the annular pressure of the drilling fluid to ensure the stability of the well wall.

Description of drawings

Figure 1 is a structural diagram of the energizer.

Figure 2 is a structural diagram of the upper sub-section housing.

Figure 3 is a structural diagram of the lower sub-section housing.

Figure 4 is a structural diagram of the blade drum.

Figure 5 is a schematic diagram of the circumferential distribution of the blades.

Fig. 6 is a schematic diagram of the bottom hole drilling tool system for dynamic intelligent drilling.

In the figure: 1. Gasket; 2. Screw; 3. Tapered sleeve; 3a. Tapered sleeve sealing ring groove; 4. Key; 5. Blade rotor; 5a. Rotor keyway; 6. Lower sub Shell; 6a. Lower threaded hole; 6b. Lower boss; 7. Double linkage coaxial motor; 7a. Motor A; 7b. Motor B; 7c. Coaxial motor shaft; 8. Cable; 9. Sealing device; 10. Blade; 11. Bearing; 12. Sleeve; 13. Upper nipple casing; 13a. Upper threaded hole; 13b. Upper boss; 14. Crawling well wall supporting machinery; 15. Downhole motor; 16. Drill bit; 17 .Electric drill pipe.

Detailed ways

The present invention is not limited by the following implementation examples, and specific implementation manners can be determined according to the technical solutions of the present invention and actual conditions. The present invention will be further described below in conjunction with accompanying drawing. The positional relationship of up, down, left, right, etc. is determined according to the layout direction of Figure 1 of the specification.

According to Fig. 1, a bottom hole drilling fluid energizer includes an upper nipple housing 13, a lower nipple housing 6, a double linkage coaxial motor 7, a blade drum 5, blades 10, a tapered sleeve 3, and a bearing 11 , wherein the double linkage coaxial motor 7 includes a motor A7a, a motor B7b and a coaxial motor shaft 7c. It is characterized in that: the upper sub-joint housing 13 is the housing of the motor A7a, and the lower sub-joint housing 6 is the housing of the motor B7b. Tapered sleeves 3 and bearings 11 are installed on the outer surfaces of the upper sub-joint housing 13 and the lower sub-joint housing 6, and the blade rotating drum 5 is installed outside the bearing 11, and the blade rotating drum 5 is connected with the coaxial motor shaft 7c through the key 4 , the blade 10 is welded on the blade drum 5, and the sealing device 9 is installed in the sealing ring groove 3a of the tapered sleeve to prevent the annular drilling fluid from entering the upper nipple shell 13, the blade drum 5, and the lower nipple shell 6. closed cavity.

According to FIG. 1 , the motor A7a and the motor B7b share a coaxial motor shaft 7c. The coaxial motor shaft 7c has a keyway on the outside, and is connected with the blade drum 5 through the key 4;

According to FIG. 1 , FIG. 2 and FIG. 3 , the upper nipple housing 13 has an upper boss 13b inside near the thread direction, and the upper boss 13b is used for positioning the motor A7a and sealing the motor A7a. The lower short joint casing 6 has a lower boss 6b inside near the thread direction, and the lower boss 6b is used for positioning the motor B7b and sealing the motor B7b. There is an upper threaded hole 13a on the shell of the upper short joint shell 13, and a lower threaded hole 6a is opened on the shell of the lower short joint shell 6, and a screw 2 is installed in the threaded hole to fix the tapered sleeve 3.

According to Fig. 2, Fig. 3 and Fig. 6, the outer surface of one end of the upper nipple housing 13 is provided with an external thread, and the outer thread is threadedly connected with the joint of the upper electric drill pipe 17; the inner surface of one end of the lower nipple housing 6 is provided with an internal thread, Thread is threadedly connected with bottom electric drill rod 17 joints.

According to FIG. 1 and FIG. 4 , blades 10 are welded on the outer surface of the blade drum 5 , and drum key grooves 5 a are opened inside the blade drum 5 . The blade drum 5 is mounted on bearings 11 .

According to FIG. 5 , the blades 10 are welded on the blade drum 5 , and six blades 10 are evenly welded in the circumferential direction of the blade drum 5 .

According to Fig. 1, Fig. 5 and Fig. 6, in dynamic intelligent drilling, ground electric energy and mud are transmitted to the inside of the bottom hole drilling fluid energizer of the present invention through the upper electric drill pipe 17, and are sequentially transmitted to the lower part through the bottom hole drilling fluid energizer Electric drill pipe, crawlable well wall supporting machinery 14 and downhole motor 15; the electric energy drives the downhole motor 15 to rotate, driving the drill bit to rotate and break rock; the drilling fluid enters the annulus through the downhole motor 15 and the drill bit 16, and is amplified by the bottom drilling fluid. Energize the energy device, so as to return to the ground smoothly.

The principle of the present invention is: according to Fig. 1 and Fig. 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, and jointly drive the coaxial motor shaft 7c to rotate, Then the blade drum 5 is driven to rotate through the key 4, and the blades 10 on the blade drum 5 are driven to rotate. The rotating blades 10 will drive the drilling fluid to flow axially and squeeze the drilling fluid, thereby transferring energy to the annular drilling fluid. At the same time, the drilling fluid and electric energy are also transmitted to the lower electric drill pipe through the coaxial motor shaft 7c.

Claims (4)

1. a kind of shaft bottom drilling fluid energizer, including upper pipe nipple shell, lower pipe nipple shell, Double-linkage coaxial motor, blade rotor, Blade, conical sleeve, bearing, sealing device, wherein Double-linkage coaxial motor includes that motor A, motor B and coaxial motor turn Axis, it is characterised in that: the shell that upper pipe nipple shell is motor A, the shell that lower pipe nipple shell is motor B is in upper pipe nipple shell under The outer surface of pipe nipple shell is equipped with conical sleeve and bearing, and blade rotor is mounted on Bearing outer, blade rotor by key with The connection of coaxial motor shaft, blade are welded in blade rotor, and sealing device is mounted in conical sleeve closure gasket groove.

2. a kind of shaft bottom drilling fluid energizer according to claim 1, it is characterised in that: the upper pipe nipple shell is leaned in inside Nearly hand of spiral has boss, which is used for positioning motor A and sealed electric-motor A；The lower pipe nipple shell is internal close to spiral shell There is boss in line direction, which is used for positioning motor B and sealed electric-motor B；On the shell of upper pipe nipple shell and lower pipe nipple shell It is provided with threaded hole, mounting screw fixes conical sleeve at threaded hole.

3. a kind of shaft bottom drilling fluid energizer according to claim 1, it is characterised in that: the motor A and motor B shares same Spindle motor shaft；It is provided with keyway outside coaxial motor shaft, is connect by key with blade rotor；In being inside coaxial motor shaft Sky is used for transmission drilling fluid inside the coaxial motor shaft and places cable.

4. a kind of shaft bottom drilling fluid energizer according to claim 1, it is characterised in that: welded on the blade rotor outer surface It is connected to blade, and inside is provided with keyway.