CN208203525U - A kind of inner screw driving downhole pumping installation - Google Patents

Abstract

An internal screw driven downhole oil pumping device relates to an oil pumping unit. It mainly includes an inverted double-acting plunger pump, an inner screw, and a reversing block: the motor outputs rotational power, and after being decelerated by a reducer, it drives the inner screw to rotate in one direction. The inner surface of the inner screw has two left and right spiral grooves. Automatic reversing, the reversing block moves in the spiral groove in the way of rolling and sliding, and the connecting rod is fixed on the reversing block, which converts the unidirectional rotary motion of the inner screw into an up and down reciprocating linear motion, thereby lifting the crude oil to the ground . The utility model directly converts the one-way rotation of the motor into a reciprocating linear motion for oil pumping, and realizes rodless oil pumping. The transmission method improves the lifting efficiency. Really realize the purpose of energy saving and consumption reduction.

Description

An internal screw driven downhole pumping device

technical field

The utility model relates to an oil pumping unit used in an oil field, in particular to an underground sucker rod-free mechanical lifting and reversing oil pumping device.

Background technique

There are three main modes of oil production in oilfields: surface power-driven oil recovery, downhole power-driven oil recovery, and self-flowing well oil recovery. At present, most of the oilfields have entered the middle and late stage of production, and the production of self-flowing wells can no longer adapt to the current production environment. Surface power-driven oil production includes rod pumps for pumping units and ground-driven screw pumps. They are both rod pump oil production methods with simple structures and easy manufacturing. They currently dominate, accounting for about 90% of the number of artificial lift wells. However, when working in this way, it is necessary to overcome the self-weight of the sucker rod and the friction between the sucker rod and the pipe wall to do work, which makes the motor consume high energy and low efficiency; in addition, there are oil pipe wear, sucker rod breakage and pump inspection cycle Short and other issues. Downhole power-driven oil production is suitable for deep wells and horizontal wells. It mainly includes electric submersible pumps, screw pumps, hydraulic piston pumps, and jet pumps. The problem of wear and tear of parts can be solved, and the effect of energy saving and consumption reduction can be achieved, which is a new direction for the development of oilfield mining in the future.

The patent application number 200610009854.1 proposes an underground reciprocating pumping unit driven by a rotating motor, which converts the rotating motion of the motor into the linear motion of the plunger pump by using the transmission form of the rotating motor + ball screw, which has a simple structure and saves energy. The effect is good, but its commutation depends on the positive and negative rotation of the motor. When the stroke times of the plunger are high, the motor frequently commutates, which affects the working performance of the motor and is not conducive to long-term underground work. The patent with application number 201110226920.1 proposes an automatic reversing mechanism for rodless pumping units, which uses a two-way clutch mechanism to convert the one-way rotation of the motor into a two-way rotation controllable output, and the output rotation power is transmitted to the actuator, and then the The actuator is converted into a reciprocating linear motion to realize the oil pumping action. The utility model solves the problem of frequent commutation of the motor, but its structure is complex, the space of the downhole oil and casing is narrow, and the strength of the parts is difficult to guarantee and difficult to realize.

Contents of the invention

Aiming at the problems existing in the current ground power-driven oil production method, combined with the downhole power-driven oil production method, the utility model provides an internal screw-driven downhole oil pumping device to solve the problems of high energy consumption and low efficiency of the pumping unit in the prior art.

The utility model relates to an internal screw drive downhole oil pumping device, which includes an operating table, wellhead, casing, oil pipe, protective sleeve, double-acting pump, internal screw, reversing block, connecting rod, guide cylinder, motor, and reducer. The internal screw driven downhole pumping device is installed in the protective sleeve, the lower end of the tubing is tightly connected with the protective sleeve, an inverted double-acting plunger pump is fixed at the upper end of the protective sleeve, and an inner screw is installed at the lower end. The lower end of the internal screw is connected with a reducer and a motor through a lower joint. The small plunger of the double-acting pump is connected to the connecting rod through a flexible shaft. The connecting rod is covered with a guide cylinder, which limits its circumferential rotation and makes it reciprocate and linearly move along the groove of the guide cylinder. The lower end of the connecting rod is threaded with the reversing block. There is a reversing slider on the block, which moves in the left and right reciprocating spiral grooves of the inner screw. The wellhead sends electrical signals through the console, and the cables transmit the electrical signals to the downhole submersible motor, which drives the submersible motor to rotate in one direction. After being decelerated by the reducer, the rotational power is transmitted to the inner screw, which drives the reversing block to reciprocate up and down. Through the connecting rod and flexible shaft, the power is finally transmitted to the plunger of the inverted double-acting reciprocating pump, which reciprocates up and down to complete the oil recovery action.

The utility model can drive the double-acting plunger pump to reciprocate up and down by using the one-way rotation of the motor to realize rodless oil production. It also ensures the strength of the screw, and is especially suitable for oil production in deep wells and slim holes.

Description of drawings

Figure 1 is a schematic diagram of the driving structure of the internal screw downhole.

Fig. 2 is a schematic diagram of the three-dimensional structure of the reversing slider.

Figure 3 is a front view of the reversing slider.

Figure 4 is a right view of the reversing slider.

Figure 5 is a sectional view of the internal screw.

Among them, 1-operating platform; 2-wellhead; 3-oil pipe; 4-casing; 5-cable; 6-protective sleeve; 7-hole; Connecting rod; 12-upper joint; 13-inner screw; 14-lower joint; 15-reducer; 16-motor; 17-big pump barrel; 18-oil valve; 19-hole; 20-annular oil valve ;21-annulus oil inlet valve; 22-big plunger; 23-small plunger; 24-hole; 25-oil inlet valve; 26-small pump barrel; 27-flexible shaft; 28-reversing block; 29- Reversing slider; 30-end cover; 31-pin; 32-roller; 33-rolling bearing; 34-arc slider.

Detailed ways

In order to make the purpose, technical solutions, functions and advantages of the utility model clearer and more intuitive, the utility model will be further described below in conjunction with the accompanying drawings.

Referring to FIG. 1 , a downhole oil pumping device driven by an internal screw is installed in a protective sleeve 6 , and the protective sleeve is threadedly connected to the lower end of an oil pipe 3 . A hole 7 is opened on the protective sleeve 6 to communicate with the outside world, and oil can flow in and out through the hole 7 .

See Figure 1, an internal screw drive downhole device, using an inverted double-acting reciprocating plunger pump, which discharges oil in both up and down strokes, and its displacement can be as high as twice that of a single-acting pump, and the load on the up and down stroke plunger Compared with the inverted single-acting pump, the disparity is small, which greatly improves the force on the connecting rod and reduces the energy consumption of the motor. It comprises big plunger 22, little plunger 23, and big plunger 22 and little plunger 23 are a whole, and it divides reciprocating plunger pump into big pump barrel 17 and two annular spaces of little pump barrel 26. An oil outlet valve 18 is installed at the inner upper end of the large pump barrel 17, an annular oil inlet valve 21 and an annular oil outlet valve 20 are installed at the outer lower end of the large pump barrel, and a hole 19 is opened at the lower end of the small pump barrel 26 to connect with the annulus oil inlet valve. 21. The annular space formed by the annular oil outlet valve 20 communicates. An oil inlet valve 25 is installed on the large plunger 22, the inside of the small plunger 23 is hollow, and a hole 24 is opened in the circumferential direction, which communicates with the hole 7 on the protective sleeve 6, and the oil can enter the small plunger 23 through the hole 24 , into the large pump barrel 17 through the oil inlet valve 25 on the large plunger 22 . The lower end of the small plunger 23 is connected to the connecting rod 11 through a flexible shaft 27, and a reversing block 28 is installed on the connecting rod 11, and the small plunger 23 can move linearly up and down together with the reversing block 28.

The working principle of the inverted double-acting reciprocating plunger pump is as follows: during the upstroke, the small plunger 23 moves upward, the annular space in the large pump barrel 17 decreases, the pressure increases, and the oil inlet valve 25 closes. When it is enough to overcome the gravity of the liquid column in the oil pipe 3, the oil outlet valve 18 opens, and the large pump barrel 17 completes the oil discharge action; Open, the annular space oil outlet valve 20 is closed, the oil liquid enters the small pump cylinder 26 through the hole 19 from the outside, and the small pump cylinder 26 completes the oil suction work. The entire upper punching process completes an oil discharge operation;

During the downstroke, the small plunger 23 moves downward, the annular space in the large pump barrel 17 increases, the pressure decreases, the oil outlet valve 18 is closed, the oil inlet valve 25 is opened, and the oil is passed from the outside through the hole on the small plunger 23 24 enters the small plunger 23, and then flows into the large pump barrel 17 through the floating valve 25 to complete the oil suction action; at the same time, the annular space in the small pump barrel 26 decreases, the pressure increases, and the annular space oil outlet valve 20 is opened, the annular space oil inlet valve 21 is closed, and the oil is discharged into the oil pipe through the hole 19 on the small pump barrel 26 and the annular space oil outlet valve 20, and the oil discharge work is completed. The entire lower punching process completes an oil discharge operation.

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, the upper end of the reversing block 28 is threadedly connected with the connecting rod 11, the lower end is equipped with a reversing slider 29, and the connecting rod 11 is sleeved in the guide cylinder 8 to limit the connecting rod Circumferential rotation guides it to perform reciprocating linear motion, and the centralizer 9 ensures that the axis of the connecting rod coincides with the center of the oil pipe, so that the reversing slider 29 can smoothly mesh with the helical groove of the inner screw 13. The reversing slide block 29 is installed in the reversing block 28 through a bearing, and the bearing is fixed with a pin 31 and an end cover 30 . The reversing slider 29 includes a roller 32, a rolling bearing 33, and an arc-shaped slider 34. The rolling bearing 33 is directly assembled on the roller 32 through an interference fit, and the arc-shaped slider 34 is installed on the roller 32 through a bearing. 32 mainly acts as a transmission, and utilizes the principle that rolling friction is smaller than sliding friction to reduce the friction with the helical groove; the arc-shaped slider 34 mainly acts as a guide to ensure that the reversing slider 29 can smoothly pass through the left and right helical groove intersection slots.

Referring to Fig. 1 and Fig. 5, the inner screw 13 is cylindrical in shape, and the inner surface is composed of two left and right spiral grooves, which can realize the automatic reversing of the unidirectional rotation of the motor. The upper end of the internal screw 13 is threadedly connected to the upper joint 12 , and the lower end is threaded to be connected to the lower joint 14 , and the upper and lower joints of the internal screw are fixed on the protective sleeve 6 through the bearing 10 . The lower joint 14 is connected to the reducer 15 and the motor 16, and the motor 16 unidirectionally rotates after being decelerated by the reducer 15 to drive the inner screw 13 to rotate unidirectionally, so that the reversing slider 29 matched in the spiral groove reciprocates up and down.

The working process of the device provided by the utility model is as follows:

The console 1 sends out an electrical signal, which is transmitted to the downhole submersible motor 16 by the cable 5, which drives the submersible motor 16 to rotate, and outputs unidirectional rotational power, which is transmitted to the inner screw after being decelerated by the reducer 15 13. Prompt the reversing slider 29 to move in the spiral groove, and the guide cylinder 8 guides the reversing block 28 to ensure that the reversing block 28 can only reciprocate up and down. Through the connecting rod 11 and the flexible shaft 27, the power is finally transmitted Give the plunger 23 of the inverted double-acting reciprocating pump to reciprocate up and down to complete the oil recovery action.

Claims (3)

1. a kind of inner screw drives downhole pumping installation, which is characterized in that including inversion type Double-action reciprocating plunger pump, interior spiral shell Bar, commutate block, driving motor；The inversion type reciprocating pump is fixed on upper end in protection outer cylinder, and the inner screw is mounted on Lower end in outer cylinder is protected, the commutation block is placed in inner screw；The inversion type Double-action reciprocating double-acting pump, in up-down stroke Oil extraction is carried out, discharge capacity is increased.

2. a kind of inner screw according to claim 1 drives downhole pumping installation, which is characterized in that the inner screw uses Cylinder inner spiral groove structure, the digging of inner screw inner surface have two left-right rotary helicla flutes, can directly commutate.

3. a kind of inner screw according to claim 1 drives downhole pumping installation, which is characterized in that the commutation block includes Roller bearing, arc shaped slider and rolling bearing, rolling bearing directly pass through interference fit on roller bearing, and arc shaped slider passes through bearing On roller bearing, rolling bearing mainly plays transmission effect, using rolling friction be less than sliding friction principle with reduce with helicla flute it Between friction；Arc shaped slider mainly play the guiding role, and guarantees that commutation sliding block can pass through left-and-right spiral slot and intersect notch.