Hydraulic driving gear oil-well pump

Abstract

The invention discloses a liquid-driven gear oil well pump, which is composed of a connecting pipe (1), a lower joint (2) and an oil outlet joint (3), and is characterized in that a hydraulic motor (4) is arranged on the upper part of the cavity of the connecting pipe (1) , a gear pump (5) is arranged at the lower part of the cavity, and the lower joint (2) is rotatably fixed at the lower end of the gear pump (5), and the hydraulic motor rotating shaft (6) is connected with the driving gear of the gear pump (5) The shaft (8) is connected, the lower end flange of the hydraulic motor (4) and the upper cover plate of the gear pump (5) are fixed as one by the connecting body (10), and the upper end of the hydraulic motor (4) is connected with the circulating oil pipe (11). This liquid drive gear well pump does not have a sucker rod, so it solves the problem of eccentric wear of the rod and tube, and can extend the maintenance period of the oil well. It is especially suitable for inclined wells and horizontal wells; and it has low energy consumption, high pump efficiency, small equipment volume, Corrosion-resistant, wear-resistant, high pump efficiency, it also solves the common difficult problems of sand sticking, wax-containing, high-viscosity pumping, and can be widely used in oil pumping equipment in oil fields.

Description

technical field [0001] The invention belongs to oil pumping equipment in an oil field, in particular to a liquid drive gear oil pump suitable for oil production in inclined wells, horizontal wells and heavy oil wells. Background technique [0002] At present, there are two main types of oil production machinery used in oil fields: one is the plunger pump, that is, the downhole deep well pump; the other is the rod-driven screw pump. The plunger type oil well pump consists of a pump barrel, sucker rod, upper and lower valves and an outer cylinder, and pumps oil through the up and down movement of the plunger; the rod driven screw oil well pump includes a casing, a sucker rod, a rotor, a pump The oil pipe is formed, and the sucker rod rotates under the drive of the ground power equipment to drive the rotor to rotate and pump oil. The above two oil well pumps can carry out effective oil pumping, so they have been used all the time, but there are also some shortcomings. The main...

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Problems solved by technology

The above two oil well pumps can carry out effective oil pumping, so they have been used all the time, but there are also some shortcomings. The main deficiency is: because these oil production equipment are equipped with very long rods in the pipe, it is easy to cause partial wear of the rod and tube , especially when used in inclined wells or horizontal wells, this eccentric wear will be particularly obvious, which will affect the pump efficiency and service life; second, the equipment is large in size, large in investment, and high in energy consumption; third, the oil pump has many wear parts and is corrosion-resistant Low capacity, low strength, often cannot be used due to severe wear, and difficult to maintain; Fourth, it is not suitable for the production of high-viscosity oil wells

These rodless oil production machines can overcome the problem of eccentric wear of the rod and tube because there is no longer a long rod in the outer pipe. However, the efficiency of the electric submersible centrifugal pump is low, and it is only suitable for the production of oil wells with high water cut and large displacement. Oil wells below 50 cubic meters per day cannot be used due to their low efficiency; electric submersible screw pumps are also unacceptable for low-production oil wells due to factors such as low reliability of downhole reducers and high cost of submersible cables; The piston pump uses a surface booster pump to drive the power fluid into the underground motor through the oil pipe to drive the plunger pump at the lower part. It was lifted to the ground oil pipeline. During the 1970s and 1980s, this oil production method was second only to the pumping unit in the United States. It was also used in Shengli, Jianghan and other oil fields in my country in the 1980s. In the late 1990s , and gradually withdraw from the domestic market due to low efficiency

Therefore, as far as the present is concerned, there is no report on an oil well pump that can solve the problem of eccentric wear of rods and pipes, and can also be applied to deviated wells, horizontal wells, and heavy oil production.

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