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Technical Report

Wellbore Positional Uncertainty and Correction of Directional Drilling

방향성 시추를 위한 시추공 위치오차와 보정

Sunil Kwon1*
,
Jongchan Lim1
권 순일1*
,
임 종찬1
1한국석유공사 탐사생산본부
* Corresponding Author
29 February 2020. pp. 97-107
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Abstract

Wellbore surveying is the interactive process used to obtain wellbore positions according to well trajectory which connects surface coordinates to subsurface coordinates. The measured values such as the measured depth, inclination, and azimuth are used to calculate well paths with a specified reference system. However, errors exist between the true wellbore position and surveyed wellbore position, including depth measurement errors of the drillstring and wireline, misalignment errors, geomagnetic model, and magnetic interference errors. Therefore understanding and evaluating wellbore positional errors is critical for hitting reservoir targets, collision avoidance, and drilling relief wells. In this paper, wellbore positional uncertainty has been reviewed and the application of survey corrections in single and multiple wells has been investigated.

Keywords
wellbore survey
wellbore positional uncertainty
collision
correction

시추공 위치측정은 지표좌표에서 지하좌표로 연결된 시추궤도에 맞춰 굴착하면서 시추공 위치를 파악하기 위해 위치자료를 취득하는 일련의 과정이다. 측정된 시추공 위치정보인 측정깊이, 경사각 그리고 방위각을 바탕으로 기준점으로부터 시추공 위치를 계산한다. 그러나 시추공 위치측정 과정에서 측정위치의 참값과 측정값 사이의 오차가 존재하며 대표적인 오차는 시추스트링과 송신케이블 길이변화, 위치측정기 기울어짐, 자기장 모델 오차와 시추스트링 자기간섭이다. 따라서 시추공 위치오차의 이해와 검토는 목적한 저류층의 굴착, 인접공과의 충돌방지 및 구조정 시추 시 중요하다. 이 논문에서는 시추공 위치오차에 대해서 알아보고, 단일 및 다중 시추공에서의 오차 보정의 적용성을 분석하였다.

키워드
시추공 위치측정
시추공 위치오차
시추공 충돌
보정
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 57
  • No :1
  • Pages :97-107
  • Received Date : 2020-01-18
  • Revised Date : 2020-02-17
  • Accepted Date : 2020-02-21
  • DOI :https://doi.org/10.32390/ksmer.2020.57.1.097
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