Easy salvage sand control string
A technology of sand control pipe and outer pipe, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., and can solve the problems of increasing operation cycle and increasing operation cost, etc.
Inactive Publication Date: 2019-10-25
CHINA PETROLEUM & CHEM CORP +1
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It not only increases the operation cycle, but also increases the operation cost
Method used
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[0013] The detailed description and technical content of the present invention are described below with the accompanying drawings, but the accompanying drawings are only provided for reference and description, and are not intended to limit the present invention.
[0014] Such as figure 1 As shown, the easy-to-salvage sand control pipe string includes a central pipe 1 and a sand-retaining outer pipe 4. A through hole is opened on the peripheral wall of the central pipe, and the sand-retaining outer pipe is empty on the outside of the central pipe and corresponds to the through hole , the two ends of the sand-retaining outer pipe are provided with positioning rings that limit their own axial movement. The end positioning ring 2 is shown in the figure. The sand outer pipe and the positioning ring connected between the two sections can be combined into one to become the joint positioning ring 6, and the two butt welding rings are connected at the same time, and the sand retaining ...
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The invention discloses an easy-to-salvage sand prevention pipe column, which comprises a center pipe and a sand blocking outer pipe, wherein a through hole is formed in the circumferential wall of the center pipe; the sand blocking outer pipe hollowly sleeves the outer side of the center pipe and corresponds to the through hole part; the two end parts of the sand blocking outer pipe are provided with positioning rings capable of limiting axial moving of the sand blocking outer pipe per se; the sand blocking outer pipe can rotate relative to the center pipe under the positioning effect of the positioning rings; and an annular part is formed between the center pipe and the sand blocking outer pipe. The easy-to-salvage sand prevention pipe column has the advantages that one or a plurality of salvaging joints can be additionally arranged according to sand prevention requirements of an oil and gas well to form an integral sand prevention pipe column; when the sand prevention fails and the sand prevention pipe column needs to be salvaged, a salvaging tool is fed for rotating the center pipe; backing sand and formation sand are mostly filled and plugged on the outer pipe or a sand blocking layer of the pipe column, so that the center pipe can easily rotate; at the moment, the joint can be easily salvaged, and the automatic release is realized; and all sand prevention pipe columns can be easily salvaged one section by one section.
Description
technical field [0001] The invention relates to a well-retention sand control string used for mechanical sand control in oil and gas production wells, in particular to an easy-to-fish sand control string. Background technique [0002] At present, the outer sand retaining layer of the sand control string is integrated with the central pipe. When the sand control string needs to be salvaged after the sand control fails, because the filling sand and formation sand fill the wellbore, it is very difficult to salvage the sand control string and the rotating sand control string. difficulty. If the load of the derrick exceeds the minor repair operation, only one section of casing washing and salvage of the first section can be used, or the overhaul operation can be carried out. It not only increases the operation cycle, but also increases the operation cost. Contents of the invention [0003] The purpose of the present invention is to provide an easy-to-salvage sand control pipe...
Claims
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IPC IPC(8): E21B43/08
Inventor 王卫星徐广东张士学安申法顾海红郑家丰魏永舟苏帅李小军
Owner CHINA PETROLEUM & CHEM CORP