CN2053264U - Hydrodynamic mono-screw pump - Google Patents

Abstract

The utility model provides a hydraulically driven rodless oil pumping device, which is composed of a single-screw hydraulic motor, a single-screw pump, a universal coupling and the like. The ground high-pressure power fluid enters the underground through the central pipeline to drive the single-screw hydraulic motor, and drives the single-screw pump to work through the universal coupling. The device is especially suitable for the exploitation of crude oil with high viscosity, high freezing point, high gas content and high sand content, and is also suitable for the oil recovery of directional wells and cluster wells on land and sea.

Description

The invention is a hydraulic transmission type rodless oil pumping device.

In oil extraction, the pumping devices used are divided into two types: rodless and rodless, and the rodless ones include electric submersible centrifugal pumps and hydraulic piston pumps. However, these pumping equipment cannot adapt to the exploitation of oil wells under complex conditions, especially for crude oil wells with high viscosity, high freezing point, high gas content and high sand content. The hydraulic single-screw pump pumping device proposed by the present invention is especially suitable for the exploitation of oil wells in the above-mentioned complex situations, and is also suitable for the oil production of directional wells and cluster wells on land and sea.

The main components of this kind of oil pumping unit are single screw hydraulic motor, single screw pump, universal coupling, thrust bearing and free lifting device, etc. The specific structure of this hydraulic single screw pump will be described below in conjunction with the accompanying drawings.

The biggest feature of this hydraulic single-screw pump is that it adopts a series structure of single-screw hydraulic motor, universal coupling, and single-screw pump. The single-screw hydraulic motor drives the single-screw pump to achieve the purpose of underground crude oil exploitation.

The single-screw hydraulic motor consists of two single-line or multi-line screw bush pairs (4, 5 and 8, 9), and the two screws are connected by a universal joint (6) with a thrust bearing (7). Arranged symmetrically in the length direction. The upper screw is right-handed and the lower screw is left-handed. The universal joint (6) is equipped with a thrust bearing (7), forming two chambers G and H. The upper screw bush pair and the top of the inner pipe wall form a chamber F, and a channel opening c is opened from the chamber F to the outer pipe wall to discharge a part of the working power fluid. Thrust bearing (7) is made up of rotation sliding bearing and revolving rolling bearing. A centrifugal filter disc is installed above the thrust bearing, which can use centrifugal force to purify the power fluid to lubricate the thrust bearing.

The single-screw pump is also composed of two single-line or multi-line screw bushing pairs (11, 12 and 13, 14). The upper screw is right-handed and the lower screw is left-handed, symmetrically arranged in the length direction. In the middle of them is a universal joint (16). A chamber J is formed between the upper and lower screw bushing pairs; a chamber I is formed between the upper screw bushing pair of the single-screw pump and the lower screw bushing pair of the single-screw hydraulic motor; the upper screw bushing pair of the single-screw pump A chamber K is formed with the bottom end of the inner tube wall.

The single-screw hydraulic motor and the single-screw pump are connected with a universal joint (10). It is loaded into a tube with two outer bosses, and channels a and b and openings c, d, and e are opened on the tube wall to allow power fluid and crude oil to enter and exit.

The surface equipment of the hydraulic single screw pump as the pumping unit is the same as that of the ordinary hydraulic piston pump, that is, it is composed of a surface power pump, various control valves, power fluid treatment and preparation equipment, etc.

The working process of the hydraulic single screw pump is: the power fluid is pressurized by the surface power pump, reaches the downhole unit through the central oil pipe, passes through the check valve (3), and enters chambers G and H in two ways through channel a, The high-pressure power fluid drives the single-screw hydraulic motor to work, and drives the screw of the single-screw pump below to rotate through the universal coupling (10). The power fluid after work enters chambers F and I, and is discharged from outlets c and d. Since the two screws are symmetrically arranged in the length direction, the axial forces generated by them cancel each other out. Crude oil enters chamber J from channel b, pressurized by the single screw pump, enters chambers I and K, enters the tubing-casing annular space through outlets d and e, and discharges to the ground together with the working power fluid.

The characteristics of using this hydraulic single-screw pump as an oil pumping device are: no submersible motor and cables are used, the supporting equipment is simplified and the cost of equipment is reduced, the structure is simple, there are few moving parts, and there are no vulnerable parts such as slide valves and pump valves. Components, streamlines are simplified, and the requirements for power fluid treatment are reduced. General industrial water can be used as power fluid, which simplifies the operation of the power fluid purification system and the entire unit. As long as the displacement of the surface power fluid is adjusted, the speed of the single screw pump can be adjusted, so that it can effectively pump oil in oil wells with unstable working conditions or viscous oil wells with different production rates. The use of thermodynamic fluid can simplify the recovery of high-condensation oil and facilitate the start-up of single-screw pumps.

Description of drawings: 1-fishing head; 2-lifting cup; 3-one-way valve; 4-upper screw of single-screw hydraulic motor; 5-upper bushing of single-screw hydraulic motor; 6-universal with thrust bearing Coupling; 7-thrust bearing; 8-lower screw of single-screw hydraulic motor; 9-lower bushing of single-screw hydraulic motor; 10-universal coupling; 11-upper screw of single-screw pump; 12-single-screw pump 13-Single-screw pump lower screw; 14-Single-screw pump lower bushing; 15-Fixed valve seat; 16-Universal coupling.

Claims (3)

1, a kind of formula helical rotor pump that surges is characterized in that, it is to be composed in series by single screw rod hydraulic motor, universal shaft coupling, helical rotor pump.

2, according to the said formula helical rotor pump that surges of claim 1, it is characterized in that, said single screw rod hydraulic motor and helical rotor pump all are to be connected by universal shaft coupling (6 and 10) by two single lines or multi-thread screw rod lining pair (4,5 and 8,9 and 11,12 and 13,14) to form, they are in the both sides of universal shaft coupling symmetric arrangement, upper screw is dextrorotation, and the bottom screw rod is left-handed.

3, according to the said formula helical rotor pump that surges of claim 1, it is characterized in that, on the universal shaft coupling (6) of the upper and lower screw rod of the single screw rod hydraulic motor of said connection (4,8) thrust bearing (7) is housed, this thrust bearing is made up of rotation sliding bearing and revolution rolling bearing, and the centrifugal filtration dish is housed on this thrust bearing.