CN103924947B - Hollow submersible motor under the screw pump oil production device - Google Patents

Abstract

The invention relates to an oil field oil extraction device, in particular to a novel electric submersible screw pump oil extraction device. The invention solves the problem that the working shaft, the coupling and the reducer in the electric submersible screw pump oil production system are easy to have faults in a 5.5' casing oil production well, the oil pipe 1, the upper joint 4 of the motor protector, the shell 7 of the motor protector and the lower joint 8 of the motor protector are in threaded connection, the submersible motor head 10, the submersible motor stator 12 and the lower joint 13 of the submersible motor are in threaded connection, and the hollow shaft 5 of the motor protector, the hollow shaft 11 of the submersible motor and the shaft 15 of the hollow shaft transmission device are mutually connected through the shaft connector 6.

Description

Hollow submersible motor under the screw pump oil production device

technical field

The invention relates to an oil production device for an oil field, in particular to a novel electric submersible screw pump oil production device.

Background technique

In the existing technology, the motor is placed in the downhole submersible screw pump oil production system. The downhole submersible motor drives the rotor of the screw pump to rotate through the reducer or directly through the coupling. The downhole submersible motor is placed at the bottom, and the screw pump is placed In the upper part, this technology cancels the sucker rod, but because of the long transmission chain, the outer diameter of the reducer and screw pump is limited in the application of 5.5" casing production wells, and the working shaft and coupling work under pressure. The working shaft, coupling and reducer are prone to failure and have a short life, especially when the oil well output is low, the heat dissipation of the submersible motor is not good, which affects the service life of the whole machine. In order to solve the above problems, the electric submersible screw pump should be fully utilized The superiority of the system avoids the failure of the working shaft, the coupling and the reducer. The present invention has developed a new type of electric submersible screw pump oil recovery system.

Contents of the invention

The object of the present invention is to provide a screw pump oil extraction device with a hollow submersible motor under it, which can increase the working capacity and reliability of power transmission components such as motors, working shafts and couplings.

The technical solution adopted in the present invention is: it consists of oil pipe, oil pipe centralizer, mechanical seal, motor protector upper joint, motor protector hollow shaft, shaft connector, motor protector shell, motor protector lower joint, screw, Submersible motor head, hollow shaft of submersible motor, motor stator, lower joint of submersible motor, upper joint of hollow shaft transmission device, shaft of hollow shaft transmission device, bearing group, middle joint of hollow shaft transmission device, bearing, lower part of hollow shaft transmission device Joints, shaft connectors with holes, tubing collars, flexible shafts or couplings, flexible shaft device housings, screw pump rotors, screw pump stators, screen pipes, and downhole anchoring tools; among them, tubing and motor protector upper joints 1. The shell of the motor protector and the lower joint of the motor protector are threadedly connected. The oil pipe centralizer is set outside the oil pipe. The lower joint of the motor protector and the submersible motor head are connected by screw flanges. The stator and the lower joint of the submersible motor are threaded, the lower joint of the submersible motor and the upper joint of the hollow shaft transmission are connected by screw flanges, the upper joint of the hollow shaft transmission, the middle joint of the hollow shaft transmission, and the lower joint of the hollow shaft transmission The joints are connected by threads, and the lower joint of the hollow shaft transmission device, the flexible shaft device shell, the screw pump stator, the screen pipe, and the downhole anchoring tool are connected by the oil pipe collar; the hollow shaft of the motor protector and the hollow shaft of the submersible motor 1. The shafts of the hollow shaft transmission device are connected through shaft connectors, and the bearing group and bearings are used to straighten the load. The shaft of the hollow shaft transmission device, the flexible shaft and the rotor of the screw pump are connected through the shaft connector with holes. The motor protector protects the hollow shaft and the motor. The upper joint of the device and the shaft of the hollow shaft transmission device and the upper joint of the hollow shaft transmission device are sealed by a mechanical seal, and the hollow shaft of the motor protector, the hollow shaft of the submersible motor, and the shaft of the hollow shaft transmission device are connected to each other through a shaft connector.

The tubing centralizer is a rigid centralizer or a non-rigid centralizer.

The hollow shaft of the motor protector, the hollow shaft of the submersible motor, the shaft of the hollow shaft transmission device and the airtight hollow shaft.

The flexible shaft or coupling is a universal joint or a long flexible rod.

The downhole anchoring tool is a tubing anchoring tool such as a slip anchoring tool, a rotary anchoring tool, or a torque anchor.

Compared with the prior art, the present invention has the following advantages:

1) In the present invention, the oil flow channel is placed inside the motor rotor and transmission shaft, so that the external dimensions of various parts of the equipment such as the screw pump, the hollow shaft flexible transmission device, and the motor can be enlarged, and the working capacity and reliability of the equipment can be increased.

2) The transmission shaft and connector only bear tension and torque, and there is no problem of instability under pressure, which improves the reliability of the system.

3) The system removes the sucker rod string, improves the efficiency of the oil production system, reduces energy consumption, eliminates ground safety risks, saves production costs, and facilitates management.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention; Fig. 2 is a schematic diagram of the field application of the present invention.

detailed description

The present invention is described in further detail below in conjunction with the accompanying drawings, which consists of oil pipe 1, oil pipe centralizer 2, mechanical seal 3, motor protector upper joint 4, motor protector hollow shaft 5, shaft connector 6, motor protector housing 7 , motor protector lower joint 8, screw 9, submersible motor head 10, submersible motor hollow shaft 11, motor stator 12, submersible motor lower joint 13, hollow shaft transmission upper joint 14, hollow shaft transmission device shaft 15, Bearing group 16, middle joint 17 of hollow shaft transmission device, bearing 18, lower joint 19 of hollow shaft transmission device, shaft connector with hole 20, oil pipe coupling 21, flexible shaft or coupling 22, flexible shaft device housing 23, Screw pump rotor 24, screw pump stator 25, screen pipe 26, downhole anchor tool 27; oil pipe 1, motor protector upper joint 4, motor protector housing 7, motor protector lower joint 8 are threaded connections , the oil pipe centralizer 2 is set outside the oil pipe 1, the lower joint 8 of the motor protector is connected to the submersible motor head 10 by means of screws 9 flange connection, between the submersible motor head 10 and the stator 12 of the submersible motor, and the lower joint 13 of the submersible motor For screw connection, the lower joint 13 of the submersible motor and the upper joint 14 of the hollow shaft transmission are connected by screws 9 flanges, and the upper joint 14 of the hollow shaft transmission, the middle joint 17 of the hollow shaft transmission, and the lower joint 19 of the hollow shaft transmission It is threaded connection, the lower joint 19 of the hollow shaft transmission device, the flexible shaft device housing 23, the screw pump stator 25, the screen pipe 26, and the downhole anchoring tool 27 are connected through the tubing collar 21; the motor protector hollow shaft 5, submerged The hollow shaft 11 of the oil motor and the shaft 15 of the hollow shaft transmission device are connected through the shaft connector 6, and the bearing group 16 and the bearing 18 are used to support the load. The hollow shaft transmission device shaft 15, the flexible shaft 22 and the screw pump rotor 24 pass through the shaft with holes. The connector 20 is connected, the hollow shaft 5 of the motor protector is connected to the upper joint 4 of the motor protector, and the shaft 15 of the hollow shaft transmission device is sealed with the upper joint 14 of the hollow shaft transmission device through the mechanical seal 3. The hollow shaft 5 of the motor protector and the hollow shaft of the submersible motor The shaft 11 and the hollow shaft transfer device shaft 15 are connected to each other via the shaft connector 6 .

The tubing centralizer 2 is a rigid centralizer or a non-rigid centralizer, which can pass through the submersible oil cable and the test cable.

The hollow shaft 5 of the motor protector, the hollow shaft 11 of the oil submersible motor, and the shaft 15 of the hollow shaft transmission device are airtight hollow shafts, and their inner chambers can be used as production fluid outflow channels.

The flexible shaft or coupling 22 is a universal joint or a long flexible rod.

The downhole anchoring tool 27 is a tubing anchoring tool such as a slip anchoring tool, a rotary anchoring tool, or a torque anchor.

During on-site use, the ground connection mode is a motor control cabinet 31, a junction box 30, a wellhead device 29, a submersible cable 28, and the oil pipe 1 of the present invention. When working, ground power is transmitted to the downhole submersible motor through the motor control cabinet 31, junction box 30, wellhead device 29, and submersible cable 28, and the hollow shaft 11 of the submersible motor rotates to drive the hollow shaft transmission device shaft 15, flexible shaft or connecting shaft The device 22 and the screw pump rotor 24 rotate to lift the well fluid from underground to the surface through the hollow shaft channel and oil pipe 1. Wherein, the speed of the screw pump is realized by the stepless speed regulation of the motor control cabinet 31 .

Claims (5)

1. the underlying screw pump oil production device of hollow submersible electric motor it is characterised in that: it by oil pipe (1), tubing centrilizer (2), Mechanical seal (3), motor protecter top connection (4), motor protecter hollow axle (5), mandrel connector (6), motor protecter shell Body (7), motor protecter lower contact (8), screw (9), submersible electric machine with oil head (10), submersible electric machine with oil hollow axle (11), motor stator (12), submersible electric machine with oil lower contact (13), Hollow Shaft Transmission device top connection (14), hollow axle transfer device axle (15), bearing group (16), Hollow Shaft Transmission device center tap (17), bearing (18), Hollow Shaft Transmission device lower contact (19), mandrel connector with holes (20), tubing coupling (21), flexible shaft or shaft joint (22), flexible shaft device housing (23), screw pump rotor (24), screw rod Pump stator (25), screen casing (26), down-hole anchor tool (27) composition；Wherein oil pipe (1), motor protecter top connection (4), motor Protector housing (7), motor protecter lower contact are threaded between (8), and tubing centrilizer (2) is enclosed within oil pipe (1) outside, Motor protecter lower contact (8) is connected using screw (9) flange with submersible electric machine with oil head (10), and submersible electric machine with oil head (10) is electric with latent oil Machine stator (12), submersible electric machine with oil lower contact are threaded between (13), and submersible electric machine with oil lower contact (13) is filled with Hollow Shaft Transmission Putting top connection (14) utilizes screw (9) flange to connect, Hollow Shaft Transmission device top connection (14), Hollow Shaft Transmission device center tap (17) it is, threaded between Hollow Shaft Transmission device lower contact (19), Hollow Shaft Transmission device lower contact (19), flexible shaft dress Pass through tubing coupling (21) between encloser body (23), screw pump stator (25), screen casing (26), down-hole anchor tool (27) to connect； Pass through mandrel connector between motor protecter hollow axle (5), submersible electric machine with oil hollow axle (11), hollow axle transfer device axle (15) (6) connect, carried using bearing group (16) and bearing (18) righting, hollow axle transfer device axle (15), flexible shaft (22) and spiral shell Bar pump rotor (24) passes through mandrel connector with holes (20) connection, motor protecter hollow axle (5) and motor protecter top connection (4) Pass through mechanical seal (3) with hollow axle transfer device axle (15) and Hollow Shaft Transmission device top connection (14) to seal, electric motor protecting Device hollow axle (5), submersible electric machine with oil hollow axle (11), hollow axle transfer device axle (15) are connected with each other by mandrel connector (6).

2. the underlying screw pump oil production device of hollow submersible electric motor according to claim 1 it is characterised in that: oil pipe righting Device (2) is rigid centralizer or non-rigid centralizer.

3. the underlying screw pump oil production device of hollow submersible electric motor according to claim 1 it is characterised in that: electric motor protecting Device hollow axle (5), submersible electric machine with oil hollow axle (11), hollow axle transfer device axle (15) are airtight hollow axle.

4. the underlying screw pump oil production device of hollow submersible electric motor according to claim 1 it is characterised in that: flexible shaft or Person's shaft joint (22) is Hooks coupling universal coupling or long rods.

5. the underlying screw pump oil production device of hollow submersible electric motor according to claim 1 it is characterised in that: down-hole grappling Instrument (27) is slip-type anchor tool or rotary anchor tool or torque anchor tubing anchoring tool.