Conductor Sharing Offset Shoe for Borehole Collision Avoidance
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Solution Overview
Problem
Existing systems are limited in their ability to position and orient drill strings to avoid collisions between closely spaced boreholes during drilling operations, particularly in subsea and surface drilling where multiple wellbores are drilled through a conductor.
Innovation Solution
The conductor sharing offset shoe system, comprising a bullnose and an upper guide member with a guide opening, uses a guide tubing to properly position and orient the drill string, preventing collisions by maintaining sufficient space for the drill string's movement and facilitating cementing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wellbores are drilled through one conductor to conserve space and costs, then the number of boreholes per conductor increases, but the risk of collision between boreholes increases
Solution Approach 1:
A positioning device is introduced as an intermediary component between the conductor and the drill string. This device includes a guide opening and guide means that actively control and maintain the position of the drill string, preventing collision with other boreholes while enabling multiple boreholes to be drilled through a single conductor.
Solution Approach 2:
The positioning device is installed in advance within the conductor before drilling operations begin. The guide opening and positioning mechanisms are pre-configured to establish the correct spatial relationship and orientation, allowing the drill string to be accurately positioned before each drilling operation to avoid collisions.
2Reliability
If the drill string is constrained to a fixed position to prevent collision, then collision avoidance is improved, but the ability to accommodate drill string movement decreases
Solution Approach 1:
The positioning device incorporates dynamic elements that allow the drill string to move within controlled parameters. The guide opening provides lateral guidance while permitting necessary movements, and the positioning device can be adjusted or repositioned to accommodate different drilling scenarios and drill string movements.
Solution Approach 2:
The positioning device is divided into functional segments: a guide opening for lateral positioning, guide means for active control, and a positioning structure. This segmentation allows each component to perform its specific function while collectively providing both constraint and adaptability for the drill string.
Data Source
AI summary
A technique facilitates drilling operations by combining a conductor with a conductor sharing offset shoe system. The conductor sharing offset shoe system protects against collision of boreholes by properly positioning and/or orienting a drill string during drilling of boreholes through the conductor. The conductor sharing offset shoe system may comprise a bullnose disposed at a lower end of the shoe system and an upper guide member disposed at an upper end of the shoe system with a guide opening sized to receive the drill string therethrough. A guide tubing extends from the guide opening into the bullnose to guide the drill string during drilling of a borehole. The guide tubing is sized to preserve sufficient space for accommodating movement of the drill string through the conductor sharing offset shoe system externally of the guide tubing during drilling of another borehole.