Double-structure oil well pump capable of draining oil

Abstract

The invention relates to a double-structure oil well pump capable of draining oil. The problem that when existing pump checking operation is carried out, crude oil in a pump cylinder and an upper oilpipe cannot be completely drained is mainly solved. The double-structure oil well pump is characterized in that a fixed valve outer cylinder (9) is internally provided with an impact cylinder (12), and one side of the bottom of the impact cylinder (12) is provided with an impact claw; and the bottom of the fixed valve outer cylinder (9) is connected with a fixed valve seat pressure cap cover cylinder (17), the interior of the fixed valve seat pressure cap cover cylinder (17) is connected with a fixed valve seat pressure cap (15) through a pin (16), the upper portion of the fixed valve seat pressure cap (15) is provided with a fixed valve seat (14), and the upper portion of the fixed valve seat (14) is provided with a fixed valve ball (13). By means of the double-structure oil well pump capable of draining the oil, when pump checking operation is carried out, after a sucker rod and a plunger are lifted out, oil pipe positive pressuring operation can be selected to open the fixed valve ball to drain the oil, and the operation of putting a sucker rod body can be selected to open the fixed valve ball to drain the oil, so that oil sewage cannot be discharged from a shaft, waste of resources is reduced, and the double-structure oil well pump is safe, environment-friendly and low in cost.

Description

technical field [0001] The invention relates to the field of oil well pumps used in oil fields, in particular to a dual-structure drainable oil well pump. Background technique [0002] The oil pump is an important downhole tool for lifting crude oil to the ground. During the pump inspection operation, the crude oil in the pump barrel and the upper oil pipe cannot be released, and bringing it to the ground will increase environmental protection construction investment and environmental protection risks. There are mainly two kinds of devices for realizing the leakage of crude oil in the oil pipe. One is to add an oil drain device on the pump string or under the pump, and the other is an oil drain pump. [0003] Wherein the application of the drainer has the following problems: the one is that the oil drainers such as the sliding sleeve type and the rotary type installed on the pump cannot fully realize the crude oil leakage in the pump barrel and the oil pipe, and the mechanic...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that the crude oil in the pump barrel and the upper oil pipe cannot be completely discharged during the existing pump inspection operation, the present invention provides a dual-structure drainable oil well pump. The double-structure oil-drainable oil well pump is adopted, and when the pump inspection operation is performed, , after the sucker rod and plunger are pulled out, you can choose to press the tubing to open the fixed valve ball to drain oil, or you can choose to put the sucker rod body to operate to open the fixed valve ball to drain oil, so as to realize the dirty oil out of the wellbore and reduce resources Waste and safety and environmental protection cost input

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