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Process method for well completion at equal borehole diameter

A process method and a drilling and completion technology, which are applied to drilling equipment and methods, wellbore/well components, drilling equipment, etc., can solve the problems of small wellbore in the target layer and the inability to drill to the target layer, and reduce the cost of drilling and drilling. Completion cost, improvement of safety reliability and drilling speed, effect of dealing with drilling risks and accidents

Active Publication Date: 2010-12-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of plugging problematic formations by running casing in advance will result in the failure to drill the target layer or the target layer with a small wellbore

Method used

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  • Process method for well completion at equal borehole diameter
  • Process method for well completion at equal borehole diameter
  • Process method for well completion at equal borehole diameter

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Embodiment 1

[0031] Embodiment 1: Taking an equal-diameter drilling and completion process as an example, the present invention will be further described in detail.

[0032] In the construction process of the present invention, the construction steps are as follows:

[0033] 1. Refer to Figure 1.1 . According to the design requirements, the open hole section 2 was drilled. Use an outer diameter of The drill bit 1 drills the open hole section 2, and the drill string combination used is The upper part of the drill bit 1 is connected to the drill collar, the upper part of the drill collar is connected to the centralizer, and the upper part of the centralizer is connected to a 5 "drilling pipe, and the 5" drilling pipe reaches the wellhead.

[0034] 2. Refer to Figure 1.2 . The first-stage expansion casing 3 and the expansion tool combination are lowered in the drilled open hole section 2 . The expansion sleeve 3 is processed and manufactured from a solid expansion tube material. Bef...

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PUM

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Abstract

The invention discloses a process method for well completion at equal borehole diameter, which is applied to the well completion construction of oil and gas. The process method comprises the following steps of: drilling an open hole well section; downwards placing an expansion sleeve and an expansion tool; reducing a diameter-variable expansion cone by using a pump; enabling the expansion sleeve to form a lapped horn mouth by pressing; anchoring by a low-stage sealing anchoring device; injecting cementing cement into an annular space between the open hole well wall and the expansion sleeve by using a cement truck through a drill rod and the expansion tool; at the cement curing phase, continuously expanding the expansion sleeve through an upper-stage diameter-variable expansion cone; upwards lifting and recovering the expansion tool after the expansion operation is ended; downwards placing a milling tool for milling the lower-stage sealing anchoring device and a cement plug; drilling an open hole of next-stage well section; and repeating the construction operation of downwards placing the expansion sleeve and the expansion tool to realize the well body of a completion well at equal well diameter. The invention has the benefits that the inside diameter required for lapping and the inside diameter for designing the structure of the well body can be formed by reducing the reducing cones in different diameters for one time and the tube expansion process can be finished in a mode for combining machinery and hydraulic pressure.

Description

technical field [0001] The invention relates to the technical field of well drilling and completion in the petroleum and natural gas industry, in particular to a process method for realizing equal diameter drilling and completion of wells. Background technique [0002] At present, in traditional oil and gas well drilling operations, when encountering formations that need to be plugged, the measure of casing in advance is often used to solve the problem. As a result, the casing sequence specified in the original drilling design is disrupted, and the A series of associated technical problems were caused. Especially in deep wells, ultra-deep wells and deep well drilling operations with complex formations, as the number of casing layers in the well increases, the borehole diameter will continue to shrink. The method of plugging problematic formations by running casing in advance will result in the failure to drill the target layer or the target layer with a small wellbore. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/20E21B29/00
Inventor 徐丙贵吕明杰郭慧娟王雪贾涛尹洪伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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