CN110219618B

CN110219618B - Electric water plugging tool for oil well

Info

Publication number: CN110219618B
Application number: CN201910584342.5A
Authority: CN
Inventors: 吴杰; 常江
Original assignee: DAQING HUAYOU OIL TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: DAQING HUAYOU OIL TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-01-07
Anticipated expiration: 2039-07-01
Also published as: CN110219618A

Abstract

The utility model provides an oil well is electronic water shutoff instrument in pit, relates to oil field downhole tool technical field, including top connection, urceolus, lower clutch, center tube, power module, motor and valve mechanism, power module install in the annular airtight space that upper connection, lower clutch, urceolus and center tube enclose, the side of urceolus is provided with the window, the stator side direction cartridge of motor is in the window, and motor stator seals through sealed the pad with the edge of window to make stator and urceolus connect into a whole, be provided with the through-hole that is used for installing motor rotor on the motor stator, motor rotor installs in the through-hole, power cord on the motor passes through the plug-in type electric connector and is connected with power module. The invention not only does not need to arrange a steel pipe to install the motor, but also further increases the installation space of the motor rotor, and realizes the increase of the output torque of the motor by increasing the diameter of the motor rotor.

Description

Electric water plugging tool for oil well

Technical Field

The invention belongs to the technical field of oil field downhole tools, and particularly relates to an oil well downhole electric water plugging tool.

Background

After the oil field enters a high water cut period exploitation stage, water blocking measures are often needed to be taken for a high water cut layer to exploit a low water cut layer and block the high water cut layer so as to achieve the purposes of oil stabilization, water control, yield increase and consumption reduction. The traditional water plugging process adopts a mechanical water plugging mode, and the water plugging mode has the disadvantages of complex process, long construction period, inflexible water plugging adjustment and incapability of realizing automatic control, so the economic benefit is poor. In order to make up the defects of the traditional mechanical water plugging process, scientific research personnel develop an electric water plugging tool, such as a downhole wireless pressure measuring system and a pressure measuring electric switch thereof and a data acquisition transceiver disclosed in an invention patent with the patent number of CN201510303071.3, a downhole controllable electric regulator disclosed in a utility model patent with the patent number of CN201120096826.4, a layered water plugging device for oil exploitation wells disclosed in an invention patent with the patent number of CN200710144461.6, a downhole piezoelectric control switch for oil layer finding and water plugging disclosed in a utility model patent with the patent number of CN200720003208.4, and the like.

The electric water plugging tool is internally provided with a motor and a valve structure, the motor supplies power through a battery or a power supply cable, and a valve core in the valve structure is driven to move through torque output by the motor, so that the valve structure is opened and closed, and the purpose of water plugging is achieved. However, according to the requirements of the water plugging process, in order to ensure that the water plugging tool is successfully put into the well, the outer diameter of the water plugging tool is not more than 114mm, and in order to facilitate the lowering of the logging instrument, a central channel with the diameter of not less than 40mm is preferably reserved in the water plugging tool, in this case, the space for installing the motor in the water plugging tool is small, and the torque output by the motor and the torsional strength of the output shaft of the motor are difficult to improve because of the limitation of the diameter of the motor, thereby causing the problem that the valve is difficult to close when the pressure in the well is ultrahigh. In practical application, in order to provide a large installation space for the motor, the central pipe of the electric water shutoff tool is usually arranged eccentrically in the tool, but even then, the lifting of the installation space of the motor is limited. In order to further increase the installation space of the motor, some electric water shutoff tools cancel a central channel for a logging instrument to pass through in the tool, and install the motor and a valve mechanism in the center of the tool, such as an intelligent production well production increasing system disclosed in the invention patent with the patent number of CN201510288711.8, an underground adjustable flow switch disclosed in the utility model patent with the patent number of CN201420367574.8, and the like.

The installation mode not only can not log, but also has complex installation structure and large dead weight of the tool, is not beneficial to construction and transportation, and in order to make up for the defect that logging can not be carried out, the logging function module of the logging tool is often integrated on the electric water plugging tool, but the logging mode can only test the position of the water plugging tool and can not test any depth in the well.

Therefore, there is a need to develop an electric water plugging tool which can ensure the well logging instrument to pass through and can further improve the torque of the motor.

Disclosure of Invention

In order to solve the technical problems in the background technology, the invention provides an electric water plugging tool for an oil well underground.

The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides an underground electric water plugging tool for an oil well, which comprises an upper joint, an outer cylinder, a lower joint, a central pipe, a power module, a motor and a valve mechanism, wherein the valve mechanism comprises a lead screw and a valve rod, the lead screw and the valve rod are connected in a matched manner through a thread pair, the power module supplies power to the motor, the lead screw is driven by the motor to rotate and converts the rotating motion into the linear motion of the valve rod through the thread pair so as to realize the opening and closing of the valve mechanism, the motor consists of a stator and a rotor, the central pipe is eccentrically arranged, the upper joint, the outer cylinder and the lower joint are sequentially connected through threads from top to bottom, the connection part is sealed through a sealing ring, the upper end and the lower end of the central pipe are respectively inserted on the upper joint and the lower joint and are sealed through the sealing ring, the power module is arranged in an annular closed space surrounded by the upper joint, the lower, the side surface of the outer barrel is provided with a window, a stator of the motor is laterally inserted into the window, the edges of the motor stator and the window are sealed through a sealing gasket, so that the stator and the outer barrel are connected into a whole, the motor stator is provided with a through hole for mounting a motor rotor, the motor rotor is mounted in the through hole, and a power line on the motor is connected with a power module through a plug-in type electric connector;

the motor stator is connected to the mounting ring through bolts, so that the motor stator is fixed to the outer barrel.

The end part of the output shaft of the motor is provided with a square head, the end part of the screw rod is provided with a square hole matched with the square head, the output shaft of the motor and the screw rod are connected through the matching of the square head and the square hole, the side surface of the square hole is provided with a notch A for the square head to enter, so that the square head can be conveniently arranged in the square hole along the radial direction, and the side surface of the lower end of the through hole is provided with a notch B for the screw rod to enter the through hole along the radial direction. The sealing gasket is an asbestos gasket. The window is a rectangular opening, the length direction of the rectangular opening is along the axial direction of the outer cylinder, then arc-shaped grooves are respectively processed on the cylinder walls of the outer cylinder at the upper end and the lower end of the rectangular opening, correspondingly, a flange matched with the arc-shaped grooves is arranged on the motor stator, and the sealing gasket is clamped between the flange and the edge of the rectangular opening.

The invention has the beneficial effects that: the motor that adopts among the current water shutoff instrument is commercial ordinary motor, when installing the motor in the instrument, under the certain circumstances in space between urceolus and center tube, generally have two aspect factors to restrict the further promotion of motor moment of torsion, on the one hand, need set up the steel pipe in the motor outside among the prior art and fix the motor, and the installation space of motor has been compressed undoubtedly in the setting of steel pipe, on the other hand, the structure of motor and urceolus and center tube are structurally separated, the diameter of motor can not expand in the wall thickness scope of urceolus. Compared with the prior art, the motor is not only installed without arranging steel pipes, but also the installation space of the motor rotor is further increased, and the increase of the output torque of the motor is realized by increasing the diameter of the motor rotor.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view at A in FIG. 1;

FIG. 3 is a cross-sectional view at B in FIG. 1;

FIG. 4 is a schematic view of the structure of the motor;

fig. 5 is a schematic view of a coupling structure at the connection between the output shaft of the motor and the lead screw in fig. 1.

In the figure: 1-upper joint, 2-outer cylinder, 3-lower joint, 4-central tube, 5-power module, 6-plug-in type electric connector, 7-rotor, 8-stator, 9-sealing gasket, 10-lead screw, 11-valve rod, 12-mounting ring, 13-bolt, 14-square head, 15-gap A, 16-gap B and 17-flange.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

this embodiment includes top connection 1, urceolus 2, lower clutch 3, center tube 4, power module 5, motor and valve mechanism, and valve mechanism includes lead screw 10 and valve rod 11, connects through the vice cooperation of screw thread between lead screw 10 and the valve rod 11, power module 5 for the motor power supply, lead screw 10 is rotatory and pass through under the drive of motor the vice linear motion who converts rotary motion into valve rod 11 of screw thread to realize valve mechanism's switch, the motor constitute by stator 8 and rotor 7, center tube 4 eccentric settings. The above is a common structure in the prior art, and is not described herein again.

Top connection 1,

urceolus

2 and 3 three of lower clutch connect gradually and the junction passes through the sealing washer seal from top to bottom, cartridge respectively on top connection 1 and lower clutch 3 and through the sealing washer seal in the upper and lower both ends of center tube 4, power module 5 install in the annular airtight space that top connection 1, lower clutch 3, urceolus 2 and center tube 4 four enclose, the side of urceolus 2 is provided with the window, the stator 8 side direction cartridge of motor is in the window, and motor stator 8 seals through sealed pad 9 with the edge of window to make stator 8 and urceolus 2 connect into a whole, be provided with the through-hole that is used for installing motor rotor 7 on motor stator 8, motor rotor 7 installs in the through-hole (the both ends of through-hole need the shutoff, so that fix rotor 7 in the through-hole).

And a power line on the motor is connected with the power module 5 through the plug-in type electric connector 6. When the motor is installed on the outer barrel 2, the motor is electrically connected with the power module 5 through the plug-in type electric connector 6, and then the motor is inserted into the window on the outer barrel 2.

The motor that adopts among the current water shutoff instrument is commercial ordinary motor, when installing the motor in the instrument, under the certain circumstances in space between urceolus 2 and center tube 4, generally have two aspect factors restriction motor torque's further promotion, on the one hand, need set up the steel pipe in the motor outside among the prior art and fix the motor, and the installation space of motor has been compressed undoubtedly to the setting of steel pipe, and on the other hand, the structure of motor and urceolus and center tube 4 are structurally separated, and the diameter of motor can not expand to the wall thickness within range of urceolus 2. In the invention, the stator 8 of the motor is connected with the outer cylinder 2 through a special structure, so that the stator 8 of the motor and the outer cylinder 2 are structurally integrated, compared with the prior art, the motor is installed without arranging a steel pipe, the installation space of the motor rotor 7 is further increased (which is equivalent to combining the thickness of the stator 8 of the motor in the prior art with the wall thickness of the outer cylinder 2), and the diameter of the motor rotor 7 is increased, so that the output torque of the motor is increased.

The central tube 4 on the cover be equipped with the collar 12 that is used for fixed motor stator 8, motor stator 8 pass through bolt 13 and connect on collar 12 to fix motor stator 8 on urceolus 2, this kind of fixed mode has solved the joint strength problem between motor stator 8 and urceolus 2 ingeniously, thereby has guaranteed the sealed reliability in sealed pad 9 department, has improved the bearing capacity of urceolus 2.

The end part of the output shaft of the motor is provided with a square head 14, the end part of the lead screw 10 is provided with a square hole matched with the square head 14, the output shaft of the motor and the lead screw 10 are connected through the matching of the square head 14 and the square hole, the side surface of the square hole is provided with a notch A15 for the square head 14 to enter, so that the square head 14 can be conveniently installed in the square hole along the radial direction, and the side surface of the lower end of the through hole is provided with a notch B16 for the lead screw 10 to enter the through hole along the radial direction. The gap A15 and the gap B16 ensure that the motor can be smoothly installed from the side.

The window is a rectangular opening, the length direction of the rectangular opening is along the axial direction of the outer cylinder 2, then arc-shaped grooves are respectively processed on the outer cylinder walls at the upper end and the lower end of the rectangular opening, correspondingly, a flange 17 matched with the arc-shaped grooves is arranged on the motor stator 8, and the sealing gasket 9 is clamped between the flange 17 and the edge of the rectangular opening. The sealing gasket 9 is of an integral structure, is square as a whole, and is divided into four sections, wherein the two sections are arc-shaped as shown in fig. 2, and the other two sections are linear (positions are shown in fig. 3), and in the implementation process, the sealing gasket 9 can be made of asbestos pads.

Claims

1. The utility model provides an electronic water shutoff instrument in oil well pit, includes top connection (1), urceolus (2), lower clutch (3), center tube (4), power module (5), motor and valvetrain, valvetrain includes lead screw (10) and valve rod (11), connects through the vice cooperation of screw thread between lead screw (10) and the valve rod (11), power module (5) for the motor power supply, lead screw (10) are rotatory and pass through under the drive of motor the vice linear motion who converts rotary motion into valve rod (11) of screw thread to realize valvetrain's switch, the motor constitute by stator (8) and rotor (7), center tube (4) eccentric settings, its characterized in that: the utility model discloses a motor, including top connection (1), urceolus (2) and lower clutch (3) three connect gradually and the junction passes through the sealing washer seal from top to bottom, the upper and lower both ends of center tube (4) cartridge respectively on top connection (1) and lower clutch (3) and through the sealing washer seal, power module (5) install in the annular airtight space that encloses at top connection (1), lower clutch (3), urceolus (2) and center tube (4), the side of urceolus (2) is provided with the window, stator (8) side cartridge of motor is in the window, motor stator (8) is sealed through sealed pad (9) with the edge of window to make stator (8) and urceolus (2) connect into a whole, be provided with the through-hole that is used for installing motor rotor (7) on motor stator (8), motor rotor (7) are installed in the through-hole, the power line on the motor is connected with the power module (5) through the plug-in type electric connector (6);

the motor stator fixing device is characterized in that a mounting ring (12) used for fixing the motor stator (8) is sleeved on the central tube (4), and the motor stator (8) is connected to the mounting ring (12) through a bolt (13), so that the motor stator (8) is fixed on the outer barrel (2).

2. An oil well downhole electric water shutoff tool according to claim 1, characterized in that: the end part of an output shaft of the motor is provided with a square head (14), the end part of the lead screw (10) is provided with a square hole matched with the square head (14), the output shaft of the motor is connected with the lead screw (10) through the matching of the square head (14) and the square hole, the side surface of the square hole is provided with a notch A (15) for the square head (14) to enter, so that the square head (14) is conveniently installed in the square hole along the radial direction, and the side surface of the lower end of the through hole is provided with a notch B (16) for the lead screw (10) to enter the through hole along the radial direction.

3. An oil well downhole electric water shutoff tool according to claim 1, characterized in that: the sealing gasket (9) is an asbestos pad.

4. An oil well downhole electric water shutoff tool according to claim 1, characterized in that: the window is a rectangular opening, the length direction of the rectangular opening is along the axial direction of the outer cylinder (2), then arc-shaped grooves are respectively processed on the outer cylinder walls at the upper end and the lower end of the rectangular opening, correspondingly, a flange (17) matched with the arc-shaped grooves is arranged on the motor stator (8), and the sealing gasket (9) is clamped between the flange (17) and the edge of the rectangular opening.