Oil collecting casing connecting device

Abstract

The present invention relates to an oil-collecting oil casing communicating device. It is formed from two layers of steel pipe, and is characterized by that the diameter of outer layer steel pipe is slightly less than the diameter of casing, the diameter of inner layer steel pipe is equal to or less than the diameter of oil pipe, two ends of inner layer steel pipe are equipped with male thread respectively, and the outer layer steel pipe is welded between two male threads of inner layer steel pipe, on the periphery of upper portion of said inner layer steel pipe several holes are set, on the periphery of lower portion of said outer layer steel pipe several holes are set, the male thread of inner layer steel pipe is connected with oil pipe under the oil well pump by means of collar.

Description

1. Technical field [0001] The invention relates to an oil-casing connector used in the production well pipe of an oil pumping unit in an oil field, in particular to an oil-collecting type oil-casing connector. 2. Background technology [0002] At present, in the downhole string of oil pumping wells in oil fields, screens are used to communicate with the annular space of the oil casing, so as to facilitate well cleaning and test the depth of the liquid level. However, since the crude oil enters the annular space of the oil casing through the screen pipe, the foam section of the crude oil is formed, which affects the accuracy of the liquid level test. When the liquid level returns to the wellhead, the casing oil can be released by opening the casing valve, which becomes a means for criminals to steal oil. target, and easily cause ground crude oil pollution. There are also closed pipe strings, that is, the closed oil casing is connected, which has the disadvantage that it is i...

AI Technical Summary

Problems solved by technology

However, since the crude oil enters the annular space of the oil casing through the screen pipe, the foam section of the crude oil is formed, which affects the accuracy of the liquid level test. When the liquid level returns to the wellhead, the casing oil can be released by opening the casing valve, which becomes a means for criminals to steal oil. target, and is likely to cause ground crude oil pollution

There is also a closed pipe string, that is, the closed oil casing is connected, and there is a disadvantage that the liquid level data cannot be recorded

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