Hollow oil pumping device for fluid producing profile tests

Abstract

The invention relates to a hollow oil pumping device for fluid producing profile tests in the field of oil field underground oil extraction tools. The hollow oil pumping device comprises a central pipe. A release connector is connected to the upper end of the central pipe in a threaded manner. A lower connector is connected to the lower end of the central pipe in a threaded manner. A hollow rod oil pump is connected to the lower end of the lower connector. An upper inner clamp sleeve and a lock ring are sequentially slidably sleeved on t he outer wall of the central pipe on the lower side of the release connector. A lock ring sleeve is sleeved outside the upper inner clamp sleeve and the lock ring. One-way lock teeth which are meshed are respectively disposed on the inner wall of the lock ring and the outer wall of the central pipe on the lower side of the lock ring. A thrust sleeve is connected to the outer wall of the lower end of the lock ring sleeve in a threaded manner. A packing rubber cylinder and anchoring slips are disposed on the periphery of the central pipe at the lower end of the thrust sleeve. A hydraulic cylinder is disposed on the periphery of the central pipe between the lower end of the release connector and the upper inner clamp sleeve, and a through hole communicated with the inner cavity of the hydraulic cylinder is formed in the wall of the central pipe. By the hollow oil pumping device, oil pumping can be achieved during fluid producing profile tests. In addition, the hollow design provides a passage for instruments and conveying tools to move up and down during the tests.

Description

technical field [0001] The invention relates to the field of downhole oil production tools in oil fields, in particular to a hollow oil pumping device for testing liquid production profiles. Background technique [0002] With the production of highly deviated wells and horizontal wells in the oil field, the water cut gradually increases, and the production efficiency is low and the cost increases in the high water cut period. In order to improve the development effect of this type of well, it is necessary to search for water, determine the water-producing interval of the oil well, and then carry out water plugging. At present, the more accurate method for judging the water outlet position of an oil well is to conduct a fluid production profile test. Through the fluid production profile test, the oil and water production conditions in the production interval of the oil well can be understood, and the production adjustment or plugging measures of the oil well can be implemente...

AI Technical Summary

Problems solved by technology

[0003] At present, the testing techniques for fluid production profile of mechanically pumped wells at home and abroad mainly include: 1. Annulus logging technique, which adopts eccentric wellhead, offsets the production string, and runs the logging instrument through the casing annulus. If the logging cable is entangled with the production string, the logging tool is stuck in the casing annulus, and the size of the running tool is also limited; 2. Double string logging process: two casings are run in the wellbore for production and testing The production string is used for production, and the test instrument is lowered through the test string, which avoids the problem of cable entanglement or instrument jamming. Due to the lowering of two sets of strings, there are higher requirements for the size of the wellbore , only for the upper part is 9 "in cased well

[0004] Due to the low output of oil wells in some oil fields, rod pumps are used for lifting during production, and 5 "Completion with small casing, the above two testing processes are difficult to realize due to the limitation of casing size

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