Multilateral well barefoot well completion method

An open-hole well completion and branch well technology, applied in wellbore/well components, drilling equipment and methods, drilling equipment, etc., can solve problems such as inability to separate mining, high construction costs, and difficult workover, to ensure accuracy , Reliable positioning, and small diameter loss

Inactive Publication Date: 2020-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the loss of the main wellbore diameter is large, and separate production is impossible, which brings difficulties to sub

Method used

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  • Multilateral well barefoot well completion method
  • Multilateral well barefoot well completion method
  • Multilateral well barefoot well completion method

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Embodiment Construction

[0060] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0061] Multilateral well technology is a complex system engineering, which requires systematic design and comprehensive consideration of reservoir geology, drilling, well completion and oil recovery technology.

[0062] Casing cementing in the main wellbore, half-process cementing in the branch wellbore, open hole completion in the horizontal section, optional hydraulic tilter window opening system, and branch liner hanging open hole section technology at the branch connection to realize the main and branch wellbore. Connections, branch connections have mechanical support, and the main and branch wellbores have the capability of selective re-entry operation in the later stage. Specifically: in the Tahe fractured-vuggy carbonate oilfield, the Φ250.8mm drill bit was drilled to the top of the Ordovician in the production layer (about 6200m deep), and the Φ193.7mm product...

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Abstract

The invention provides a multilateral well barefoot well completion method, and belongs to the technical field of well completion and production in the process of oil exploration and development. Themultilateral well barefoot well completion method comprises the steps that a main borehole is drilled, and a casing pipe is run in the main borehole for well cementation; a horizontal well section isdrilled below the main borehole and subjected to barefoot well completion, and the horizontal well section is a first branch borehole; one or more branch boreholes are sequentially drilled in the casing pipe of the main borehole from bottom to top, and correspondingly are a second branch borehole to an nth branch borehole; and halfway well cementation is adopted on the second branch borehole to the nth branch borehole. According to the multilateral well barefoot well completion method, the selective re-entry of the branch boreholes and the mechanical support of branch connection points are successfully achieved, the large diameter of a main shaft is ensured, the probability of drilling and meeting fracture holes is increased, and an effective method for efficient production of fractured-vuggy reservoir is achieved.

Description

technical field [0001] The invention belongs to the technical field of well completion and production in the process of petroleum exploration and development, and in particular relates to an open-hole well completion method for multi-branch wells. Background technique [0002] Multilateral well technology is a new drilling and completion technology developed after directional well, sidetracking well and horizontal well technology. Several branch wells are drilled in one wellbore, the upper well section can be reused, the drilling cost can be reduced, and the oil drainage area can be increased. In terms of solving the production mode of special oil reservoirs and improving the production and recovery of oil wells in new and old oil fields, etc., It has obvious technical and economic advantages. [0003] The completion method of multilateral wells is quite different from that of vertical wells and horizontal wells, and its technical difficulty is relatively large. The selecti...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B7/04E21B7/20E21B29/06E21B33/13E21B43/14E21B43/27
CPCE21B7/00E21B7/046E21B7/20E21B29/06E21B33/13E21B43/14E21B43/261
Inventor 吴俊霞刘欢乐何祖清付道明姚志良庞伟李晓益
Owner CHINA PETROLEUM & CHEM CORP
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