Stage Cementing Tool for Casing While Drilling
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Solution Overview
Problem
Current methods for cementing wellbores formed by drilling with casing face challenges such as ineffective cement distribution due to weak earth formations and difficulty in ensuring complete annulus cementation, particularly when cementing from the top or bottom of the casing.
Innovation Solution
The implementation of a method and apparatus that includes a casing string with a drilling member, a cementing stage tool positioned at intermediate locations, and a one-way valve, allowing for controlled cement circulation through a port in the stage tool to ensure thorough cementing without relying on the lower end of the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cementing is performed from the bottom of the casing, then the cement can be circulated into the annulus, but the cement may flow into weak earth formations rather than up the casing annulus
Solution Approach 1:
The cementing operation is divided into multiple stages with intermediate cementing points along the casing string. Instead of a single bottom-up cementing operation, the annulus is cemented in segments through multiple stage tools positioned at different depths, allowing controlled cement placement that prevents formation intrusion while ensuring complete annulus coverage.
Solution Approach 2:
Stage tools with packers are introduced as intermediary elements to isolate different annular sections. These packers create temporary barriers that control cement flow paths, preventing cement from entering weak formations while ensuring proper cement distribution in the annulus through intermediate cementing operations.
2Ease of operation
If cementing is performed from the top of the casing, then cement circulation is simplified, but it is difficult to ensure the entire annulus is cemented
Solution Approach 1:
The annulus cementing is segmented into multiple sections corresponding to different stage tools positioned along the casing string. Each stage tool independently cements a specific annular section, ensuring complete coverage of the entire annulus while maintaining simplified top-down cement circulation through each segmented section.
3Device complexity
If a single-stage cementing operation is used, then the cementing process is simpler, but complete isolation of production zones at different depths cannot be achieved
Solution Approach 1:
The cementing system is segmented into multiple independent stage tools, each capable of isolating and cementing specific annular sections. This segmentation enables complete isolation of production zones at different depths through coordinated multi-stage cementing operations, while each individual stage maintains operational simplicity.
Solution Approach 2:
Each stage tool is equipped with its own packer and cementing capability, allowing it to independently perform isolation and cementing functions for its designated section. This self-service capability of each stage tool ensures reliable production zone isolation without requiring complex inter-stage coordination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient cementing of wellbores by allowing cement to be circulated through the stage tool at intermediate locations, ensuring complete annulus cementation and reducing the risk of cement flow into weak formations, thereby stabilizing the wellbore and isolating production zones effectively.
Implementation Method 1
a one-way valve disposed at a lower portion of the casing string
Implementation Method 2
a packer disposed at an intermediate location on the casing string
Data Source
AI summary
Apparatus and methods are provided for a cementing operation for use with a drilling with casing application. In one embodiment, an apparatus is provided for stage cementing using a full opening stage tool. In another embodiment, an apparatus is provided for reverse cementing of the casing.