Double- stroke flexible pumping unit annular gas test wellhead

Abstract

The invention provides a double- stroke flexible pumping unit annular gas test wellhead, for mainly resolving problem of contradiction between of a major diameter seal structure and eccentric test in prior a double-stroke pumping unit wellhead. The wellhead is characterized in that: a press cap (1) is connected with a splint connecting sleeve (5) with a boss by screw thread in internal side, a splint (2) and a marble (2) are fixed out of the splint connecting sleeve (5), a pump barrel connecting sleeve (4) is connected in the splint connecting sleeve by screw thread, a connecting tube (9) is fixed out of the lower end of the pump barrel connecting sleeve (4), a seal working barrel (10) is connected in the pump barrel connecting sleeve by screw thread, a plunger (11) is fixed in the sealing working barrel (10), lower of a marble disk (12) is connected with a oil pipe (17), a marble (15) is fixed between the exterior of the marble disk and a four-way (13) of the oil pipe, a test valve assembly (14) is fixed at upper of a test passage (16) right of the marble disk (12), and a reducer union (18) is welded at lower if the oil pipe (17). The wellhead of the invention has features of convenient eccentric test and no pollution on environment.

Description

Technical field: [0001] The invention relates to a device in the field of oil recovery in an oil field, in particular to a double-range flexible pumping unit capable of testing the wellhead in annulus. Background technique: [0002] With the development of oilfields and the continuous development of technology, there are various types of mechanical oil production equipment ranging from beam pumping units to electric submersible pumps and screw pumps to meet the needs of different production periods. At present, a new type of pumping unit—Beicheng flexible pumping unit is used to lift well fluid in low-production oil wells. It is widely welcomed because of its advantages of low energy consumption and small one-time investment. The double-range flexible pumping unit must adopt a large-diameter sealing structure due to the need for sealing, but in wells that require eccentric testing, testing instruments need to be run in the limited space of the oil casing, which is contradict...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the contradiction between the large-diameter sealing structure in the wellhead of the existing double-range pumping unit and the eccentric test, that is, the problem that the limited oil casing space cannot be lowered into the testing instrument, the invention provides a double-range flexible pumping The machine can test the annulus at the wellhead. The double-range flexible pumping unit can test the annulus. The wellhead has the characteristics of convenient eccentricity test and no pollution to the environment, and solves the problem of running the casing with an inner diameter of Φ124mm into the annulus space of the tubing with an outer diameter of Φ89mm. Only 17.5mm, can not be lowered into any test equipment

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