Process method for solving casing deformation of gypsum-salt layer segment

A process method and technology of gypsum-salt layer, applied in the field of casing deformation in gypsum-salt layer, can solve problems such as oilfield loss, restriction of oilfield exploration and development process, old well sealing gypsum-salt layer casing collapse and casing deformation, etc., to achieve The effect of reducing construction costs

Active Publication Date: 2020-09-22
CNPC BOHAI DRILLING ENG +1
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  • Abstract
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Problems solved by technology

With the passage of time, many old wells have experienced different degrees of collapse and casing change in sealing gypsum-salt layers, which has brought heavy losses to the oilfield and seriously restricted the exploration and development process of the oilfield.

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  • Process method for solving casing deformation of gypsum-salt layer segment
  • Process method for solving casing deformation of gypsum-salt layer segment
  • Process method for solving casing deformation of gypsum-salt layer segment

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Embodiment Construction

[0033] First of all, it should be noted that the specific structure, features, and advantages of the present invention will be described in detail below by way of examples. However, all the descriptions are only for illustration and should not be construed as limiting the present invention. . In addition, any single technical feature described or implied in each embodiment mentioned herein, or any single technical feature displayed or implied in each drawing, can still be used in these technical features (or their equivalents). ) Continue to perform any combination or deletion, so as to obtain more other embodiments of the present invention that may not be directly mentioned in this article. In addition, for the sake of simplification of the drawings, the same or similar technical features may only be labeled in one place in the same drawing.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vert...

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Abstract

The invention relates to a process method for solving casing deformation of a gypsum-salt layer segment. The process method comprises the following steps of expanding a gypsum-salt layer and the wellbore diameters of well sections at certain distances up and down by means of an underreamer after finishing drilling of this open time; separately obtaining annular volumes formed by the well section below the gypsum-salt layer and the well section above the gypsum-salt layer and a this open time casing; tripping a pipe string of the casing in a shaft bottom, wherein a classifying hoop and an expansion packer on the pipe string are located 20 m above the gypsum-salt layer; carrying out primary well cementation; injecting cement slurry of corresponding annular volume into a space between the well section below the gypsum-salt layer and the this open time casing; carrying out secondary well cementation; injecting cement slurry of corresponding annular volume into a space between the well section above the gypsum-salt layer and the this open time casing; and freezing the cement slurry, wherein the gypsum-salt layer segment is in a non-sealed state, so that inhomogeneous stress of a stratumis released.

Description

Technical field [0001] The invention belongs to the technical field of petroleum and natural gas drilling, and particularly relates to a process method for solving casing deformation in a gypsum-salt interval. Background technique [0002] At present, many oil fields in China have discovered rich oil and gas reservoirs buried under thick gypsum-salt layers, and have conducted exploration and development. With the passage of time, many old well sealing gypsum-salt casing casings have undergone different degrees of collapse and casing change, which has caused major losses to the oil field and severely restricted the exploration and development process of the oil field. [0003] Reasons for casing collapse deformation (referred to as casing deformation): (1) The gypsum-salt rock will produce plastic flow under the pressure of the overlying strata. If the formation around the well is unevenly stressed, it will be added after cementing. The non-uniform creep stress around the casing wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B29/10
CPCE21B29/10E21B33/13
Inventor 陈新勇杨恺李立昌张雅静游子卫韩煦付潇陈奇涛张娅楠
Owner CNPC BOHAI DRILLING ENG
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