Casing sidetracked well completion method using expansion screen tube

A screen tube completion and sidetracking technology, which is applied in wellbore/well components, earthwork drilling, production fluid, etc., can solve problems such as easy sand plugging and small inner diameter of sand control screen, and achieve low operating costs and reduced production cost, effectiveness in reducing sand impact and erosion problems

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art, to provide a cased sidetracking well expansion screen completion method, to overcome the technical problems of conventional sand control screens such as small inner dia

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  • Casing sidetracked well completion method using expansion screen tube
  • Casing sidetracked well completion method using expansion screen tube
  • Casing sidetracked well completion method using expansion screen tube

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Embodiment Construction

[0019] The method of the present invention will be further described in conjunction with the accompanying drawings.

[0020] like Figure 1~Figure 5 As shown, the completion liner of the sidetracking well is mainly the expansion screen 2, which is suspended and sealed by the expansion hanger 1, and a large-diameter casing 3 can be appropriately added between the expansion hanger 1 and the expansion screen 2 according to requirements. The expansion hanger 1 is located at the top of the pipe string, and its outer surface is processed to provide a suspension sealing rubber ring 7, and the bottom is processed with a bell-shaped starting device for prefabricating the expansion cone 6; the expansion screen 2 mainly includes the expansion base pipe 10. The filter screen 11 and the protective cover 12 have a three-layer structure. The expansion base pipe 10 is evenly processed with slots, and the filter screens 11 partially overlap each other and are sandwiched between the expansion b...

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Abstract

The invention relates to a casing sidetracked well completion method using an expansion screen tube. The casing sidetracked well completion method includes laying down a tail tubular pile with an expansion screen tube into a preset position in a well, and pressing and hanging an expansion hanger to enable a rubber ring on the expansion hanger to attach into an original well casing for suspending and sealing a completion tubular pile; subjecting the expansion screen tube to adaptive expansion through a reducing expansion tool, enabling the expansion screen tube to cling to the well wall after expansion, and eliminating an annular space of the screen tube and the well wall. The casing sidetracked well completion method has the advantages that the hanger can have larger inner diameter after being expanded, late oil exploration and operation are facilitated, runout of the tail tube head is prevented, the expansion screen tube clings to the well wall after being expanded, drift diameter is large, oil flow area and sand filter area are enlarged, sand prevention effect of the screen tube is improved, and exploration effect that capacity and exploration and recovery rate are increased are achieved.

Description

technical field [0001] The invention relates to a casing sidetracking expansion screen pipe completion method in the technical field of petroleum drilling and completion. technical background [0002] At present, my country's unconsolidated sandstone reservoirs have a wide distribution range, large reserves, and production occupies an important position. The sand production of oil wells seriously restricts the increase of my country's oil production and the control of oil production costs. With the arrival of the middle and late stages of oilfield development, the number of wells with special technology has increased year by year, while the completion and sand control of horizontal wells, multilateral wells, and sidetracked wells are more difficult. Sand production in sidetracking wells has the following characteristics: small perforation holes, high critical flow velocity, and easy sand production; small boreholes, limited sand pockets, and easy sand burial of oil layers af...

Claims

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Application Information

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IPC IPC(8): E21B23/01E21B43/08
Inventor 唐明马建忠宁学涛朱海波彭志刚吴柳根滕照正蔡鹏唐成磊沈学祥朱万胜
Owner CHINA PETROLEUM & CHEM CORP
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