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Well drilling method using combination system of screw and rotary guide tool

A rotary steering, combined system technology, applied in directional drilling, rotary drilling, rotary drilling rigs, etc., can solve problems such as insufficient wellbore cleaning and ROP limitation, and achieve the improvement of top drive speed, prolong life, reduce high effect

Active Publication Date: 2020-08-18
洲际海峡能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a drilling method using a combined system of a straight screw motor and a rotary steerable tool to solve the problems of limited mechanical penetration rate and insufficient wellbore cleaning in the prior art

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  • Well drilling method using combination system of screw and rotary guide tool

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Embodiment Construction

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0023] In the existing technology, when using the combined system of screw and rotary steerable tool to drill wells, the lower top drive speed (40rpm-60rpm) has been used. People in the industry believe that when the screw speed is higher, it is easy to cause damage or even twisting of the screw, but this cognition is Cognitive misunderstandings caused by the limitation of the rotational speed of the bent screw.

[0024] In order to overcome the cognitive bias of the prior art, the present invention provides a drilling method using a screw and rotary steerable tool combination system, which includes:

[0025] According to the dogleg degree of the wellbore, the wellbore is divided into low dogleg well section, medium dogleg well s...

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Abstract

The invention provides a well drilling method using a combination system of a screw and a rotary guide tool. The well drilling method comprises the steps that a borehole is divided into a well sectionwith a low overall angle change rate, a well section with a middle overall angle change rate and a well section with a high overall angle change rate according to the overall angle change rate of theborehole, specifically, the overall angle change rate of the well section with the low overall angle change rate is smaller than the overall angle change rate of the well section with the middle overall angle change rate, and the overall angle change rate of the well section with the middle overall angle change rate is smaller than the overall angle change rate of the well section with the high overall angle change rate; and a drilling tool with the combination system of the screw and the rotary guide tool is used for drilling, during the drilling process, a first top drive rotating speed isused when the screw is in the well section with the low overall angle change rate, a second top drive rotating speed is used when the screw is in the well section with the middle overall angle changerate, a third top drive rotating speed is used when the screw is in the well section with the high overall angle change rate, specifically, the first top drive rotating speed is greater than the second top drive rotating speed, and the second top drive rotating speed is greater than the third top drive rotating speed. According to the well drilling method, through increasing the top drive rotatingspeed during drilling, the mechanical drilling speed can be further increased, the borehole cleaning during drilling is improved, the height of a debris bed is reduced, and the risk of downhole accidents such as debris avalanche and sand bridge sticking is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a drilling method using a combined system of a screw rod and a rotary steering tool. Background technique [0002] In the drilling construction of directional wells and horizontal wells, conventional curved screw rods have the problem of supporting pressure during directional drilling, and the rotary steering tool can effectively avoid the problem of directional supporting pressure because it can be oriented during rotation. However, the rotary steerable tool also has certain technical shortcomings in practical application: the driving force of the rotary steerable tool comes from the top drive, and its speed is affected by many factors such as the torque output of the top drive, the speed output of the top drive, the stick-slip vibration of the tool, and the casing grinding. Due to the restriction of various factors, the ROP is low when drilling in formations sensitive to rotat...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B44/00E21B3/02
CPCE21B7/04E21B44/00E21B3/02
Inventor 孙金德张福祥刘万寿李志斌
Owner 洲际海峡能源科技有限公司
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