Oil collecting casing connecting device

A technology of oil casing and connecting device, which is applied in the field of oil collecting type oil casing connecting device, can solve the problems of oil theft by criminals, crude oil pollution on the ground, affecting the accuracy of liquid level testing, etc., and achieves a convenient implementation and a simple structure Effect

Inactive Publication Date: 2007-03-21
张希茂
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  • Claims
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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 openin

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[0011] In order to further disclose the technical solution of the present invention, a detailed description is given below in conjunction with the accompanying drawings of the description through embodiments:

[0012] As shown in Figure 1, the present invention is composed of double-layer steel pipes, and is characterized in that the diameter of the outer layer steel pipe 2 is slightly smaller than the diameter of the casing, the diameter of the inner layer steel pipe 4 is equal to or smaller than the diameter of the oil pipe, and the two ends of the inner layer steel pipe are provided with male threads 1, The outer layer steel pipe is welded between the two male threads of the inner layer steel pipe, a number of holes 3 are arranged on the outer periphery of the upper part of the inner layer steel pipe, and a number of holes 3 are arranged on the outer periphery of the lower part of the outer layer steel pipe; The oil pipes are connected with couplings.

[0013] There are man...

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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...

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Application Information

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IPC IPC(8): E21B43/08
Inventor 张希茂于会良路军
Owner 张希茂
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