Annulus logging well head equipment for oil well

Abstract

The invention relates to the technical field of oil exploitation equipment, in particular to annulus logging well head equipment for an oil well. The annulus logging well head equipment for the oil well comprises a driving head, a hydraulic station, a polish rod and a screw pump; the driving head comprises a hydraulic motor; the power output end of the hydraulic motor is fixedly connected with the upper end of the polish rod; the lower end of the polish rod is fixedly connected with the power input end of the screw pump. According to the annulus logging well head equipment for the oil well, disclosed by the invention, power is supplied for the screw pump by adopting the hydraulic station; during power cut, the hydraulic motor becomes an oil pump, and a twisting force can be slowly released from the screw pump and the polish rod through a speed control valve, and thus, the accidents, such as distortion or release and the like cannot occur on the screw pump or the polish rod under high-speed revolution; a low-power driving motor is selected, and is small in size, and the test mode of a conventional pumping well is completed without matching a cable car with a wellhead guiding shoe; automatic lifting is realized on the hydraulic motor and a thrust bearing fuel tank assembly through a lifting oil cylinder, so that enough space for test equipment to enter the well to perform test is reserved, and the labor strength of workers is reduced.

Description

technical field [0001] The invention relates to the technical field of oil extraction devices, and relates to a wellhead device for testing the annular space of an oil well. Background technique [0002] Screw pump is a type of oil well pump that has been rapidly developed and applied in the world in recent years. Because it runs at a constant speed and has no inertia loss of machinery and liquid flow, it can be used not only for the production of general oil wells, but also for high-viscosity, high-pressure pumps. In the production of sandy oil wells, at the same time, the screw pump has a series of advantages such as safety, environmental protection, high efficiency, low energy consumption, simple structure, low price, small size, and easy operation, and has been recognized by the industry at home and abroad. However, there are still some problems in the use of screw pumps at present: on the one hand, the oil production device of the screw pump used in the oil field uses a...

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Problems solved by technology

[0003] The present invention provides a wellhead device for oil well annulus testing, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the existing volume of the existing screw pump drive device Large, negative pressure measurement can only be realized by using the cable car matching wellhead guide shoes, high work intensity, long time, high cost, and the screw pump and polished rod are reversed due to torsion when the power is off, and the screw pump and polished rod will quickly Releasing the torque will cause the screw pump and the polished rod to twist and deform under high-speed rotation, or accidents such as slipping will occur, which will bring hidden dangers to equipment safety.

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