Liner Cementation Assembly with Rotation and Reciprocation
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Solution Overview
Problem
Existing techniques for cementing liners into wells often result in inconsistent cement distribution due to static liner placement, leading to gaps and obstructions in the annulus between the liner and the wellbore.
Innovation Solution
A method and equipment that allow for the rotation and reciprocation of the liner string during cementation by coupling a cementation assembly with the liner string, facilitating the distribution of cement and removing potential obstructions through movement of the drill string, which translates to the liner string via latching features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liner string is placed statically during cementation, then the cementation process is simpler to operate, but the cement distribution becomes inconsistent with gaps and obstructions in the annulus
Solution Approach 1:
The patent applies the dynamics principle by transforming the static liner placement into a dynamic process. The liner string is equipped with rotation and reciprocation capabilities through a specialized cementation assembly that includes a rotation device and reciprocation mechanism. This allows the liner to move dynamically during cementation, ensuring consistent cement distribution in the annulus while maintaining operational control through automated systems.
2Manufacturing precision
If the liner string is maneuvered during cementation to improve cement distribution, then cement flow consistency improves, but the device complexity increases due to additional rotation and reciprocation mechanisms
Solution Approach 1:
The cementation assembly is designed with multi-functionality, where a single integrated unit performs rotation, reciprocation, and cementation functions. The rotation device and reciprocation mechanism are combined with the cementation equipment, allowing one assembly to handle multiple operations that would otherwise require separate devices, thereby managing complexity while achieving consistent cement distribution.
Solution Approach 2:
The patent merges the rotation mechanism, reciprocation system, and cementation equipment into a single integrated cementation assembly. This combination allows the liner string to be rotated and reciprocated while simultaneously receiving cement, eliminating the need for separate operations and reducing overall system complexity despite the added maneuvering capabilities.
3Productivity
If rotation and reciprocation mechanisms are added to the liner string, then cement circulation effectiveness improves, but the weight of the liner assembly increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a separate cementation assembly that couples with the liner string externally, rather than integrating heavy rotation and reciprocation mechanisms directly into the liner. This intermediary assembly provides the necessary maneuvering capabilities while keeping the liner本身的 weight relatively low, as the additional components are housed in the external cementation unit.
Data Source
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AI summary
Present embodiments are directed to coupling a cementation assembly (100) with a hung or set liner string (12) in a well (10) and moving the liner string (12) during a cementation operation. Specifically, for example, a process in accordance with present techniques includes running a cementation assembly (100) into a well (10) on drill pipe (30) and engaging, with a distal end of the cementation assembly (100), a liner top assembly (44) of a liner string (12) that is positioned downhole in the well (10), wherein the liner string was previously positioned downhole in the well (10) without being cemented into the well (10). Further, the process includes latching the cementation assembly (100) with the liner string (12) such that movement of the cementation assembly (100) is translated to the liner string (12), and flowing cement through the drill pipe (30) and into the liner string (12) while moving the cementation assembly (100) and the liner string (12).