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Method for preventing blockage through vibration in directional drilling process of horizontal well

A technology for directional drilling and horizontal wells, which is applied in vibration generating devices, earthwork drilling, wellbore/well components, etc., which can solve the problems of high adhesion, difficulty in lifting, sticking and other problems on the lower well wall, so as to avoid sticking Effect

Inactive Publication Date: 2016-03-30
CNPC GREATWALL DRILLING ENG
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  • Abstract
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Problems solved by technology

It overcomes the disadvantages that the existing drilling tools have increasing adhesion to the downhole wall due to long-term static, resulting in difficulty in lifting and even sticking accidents

Method used

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  • Method for preventing blockage through vibration in directional drilling process of horizontal well

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Embodiment Construction

[0008] Such as figure 1 As shown, the deflection drilling tool assembly for horizontal wells is composed of drill bit 1, power drilling tool 2, drill collar, drill pipe 3 and drilling tool 6. It is a vibration and anti-seize method that can be used in the process of directional drilling in horizontal wells. The steps of the method are as follows: install one or more sets of vibratory tools 4 on the upper part of the drill collar and drill pipe 3 in the deflection drilling tool assembly of the horizontal well, and install an anti-seize centralizer 5 on the upper part of the vibratory tool 4 .

[0009] It can be understood that the above specific descriptions of the present invention are only used to illustrate the present invention and are not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or Equivalent replacements to achieve the same...

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Abstract

The invention relates to the technical field of drilling and completion of a horizontal well and an extended reach well, in particular to a method for preventing blockage through vibration in a directional drilling process of the horizontal well. The method comprises the steps of installing a group or a plurality of groups of vibration tools on the upper portion of a drill collar and drill pipe in a horizontal well kick-off assembly and installing an anti-blocking centering device on the upper portion of the vibration tools. The method reduces the occurrence probability of sticking and blocking accidents in the drilling process, the vibration tools can generate vibration under the effect of fluid power, the vibration can be effectively transferred to nearby drilling tools, and the static friction force between the drilling tools and a lower well wall can be transformed to kinetic friction force in the sliding drilling process. The problem that the drilling tools are statically located on the lower well wall for a long time, so that drilling accidents such as drill blockage occur is solved. The shortcomings that if the drilling tools are in a static state for a long time, the adhesive force caused by the drilling tools and the lower well wall is bigger and bigger, so that the drilling tools are hard to be lifted, and even the sticking and blocking accidents occur are overcome.

Description

Technical field: [0001] The invention relates to the technical field of drilling and completion of horizontal wells and extended-reach wells, in particular to a vibration prevention method applicable to the directional drilling process of horizontal wells. Background technique: [0002] During the drilling process of horizontal wells and extended-reach wells, due to differences in geological conditions, formation pressure coefficients, and wellbore purification conditions, it is often difficult to slide the horizontal wells and extended-reach wells in the later stage of construction. Due to the action of gravity, the section is close to the wellbore, and the drilling tool remains still for a long time, causing sticking and other accidents, which leads to many complicated situations in the drilling process. Because horizontal wells and extended-reach wells have long well sections and deep stuck points, measures such as foam release, explosive loosening, fishing, casing millin...

Claims

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Application Information

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IPC IPC(8): E21B28/00
CPCE21B28/00
Inventor 唐亮李丙陆李志刚王铁臣秦勇董立伟张艳斌姚建蓬王基林杨佳升王家强张旭龙郑伟蒲秀云孔范帅
Owner CNPC GREATWALL DRILLING ENG
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