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Closed loop control of drilling curvature

A technology of curvature and closed-loop method, which is applied to the automatic control system of drilling, drilling measurement, program control, etc., can solve the problems of error-prone, inability to directly control wellbore curvature, and failure to consider formation effects, etc., to reduce wellbore bending, Improve drilling efficiency and consistency, improve well placement effects

Active Publication Date: 2018-07-17
SCHLUMBERGER TECH LTD BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such methods are prone to errors due to lack of direct control over wellbore curvature and formation effects not considered

Method used

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  • Closed loop control of drilling curvature
  • Closed loop control of drilling curvature
  • Closed loop control of drilling curvature

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Embodiment Construction

[0018] figure 1 A drilling rig 10 suitable for using the various method and system embodiments disclosed herein is depicted. Semi-submersible rig 12 is located above an oil or gas formation (not shown) distributed below seafloor 16 . Subsea pipeline 18 extends from deck 20 of platform 12 to wellhead 22 . The platform may include a derrick and jacks (not shown) for raising and lowering a drill string 30 , which extends into the borehole 40 and includes a bottom hole assembly (BHA) 50 as shown. The BHA 50 includes a drill bit 32, a steering tool 60 (also referred to as a directional drilling tool), and one or more downhole navigation sensors 70, such as measurement-while-drilling sensors including triaxial accelerometers and / or triaxial magnetometers. The BHA 50 may also include substantially any other suitable downhole tool, such as a downhole motor, a downhole telemetry system, a reaming tool, and the like. The disclosed embodiments are not limited with regard to such other...

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Abstract

A downhole closed loop method for controlling a curvature of a subterranean wellbore while drilling includes controlling a direction of drilling such that the drilling attitude is substantially equalto a setpoint attitude. A setpoint rate of penetration is processed in combination with a setpoint dogleg severity to compute a setpoint attitude increment. The setpoint attitude may be adjusted by the setpoint attitude increment. The setpoint attitude may be incremented at some interval to control the curvature of the wellbore while drilling.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and benefit of US Provisional Patent Application No. 62 / 261,461 filed December 1, 2015, which is hereby incorporated by reference in its entirety. Background technique [0003] The use of automated drilling methods is becoming more common in subterranean wellbore drilling. For example, such methods may be employed to control the direction of drilling based on various downhole feedback measurements such as inclination and azimuth measurements made during drilling or logging while drilling measurements. [0004] A closed-loop automated drilling method for directing a wellbore along a predetermined attitude (i.e., along a predetermined line) is sometimes referred to in the art as an inclination and azimuth hold procedure, and may be used to Angle guide wellbore. Although these methods are commonly used, there is no known automated drilling method for directly controlling the drilling di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/06E21B44/00E21B41/00
CPCE21B44/00E21B7/06E21B45/00E21B21/08G05B2219/45129E21B7/04E21B44/02E21B47/024
Inventor P·霍恩布洛尔S·D·霍夫M·伊戈诺瓦
Owner SCHLUMBERGER TECH LTD BV