Deployable Bow Spring Centralizer for Reduced Insertion Forces
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Solution Overview
Problem
Conventional bow spring centralizers face challenges in deep-well drilling due to increased insertion and running forces, material deformation, and compromised integrity from repeated compressions and decompressions, leading to inconsistent centering and potential damage to down-bore surfaces and equipment.
Innovation Solution
A centralizer with selectively deployable bow springs that are compressed into a lower profile and retained by a releasable locking mechanism, allowing controlled cyclical pressurization to actuate a rotational ratcheting release mechanism for deployment, reducing frictional resistance and operational forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bow spring centralizers are used in deep-well drilling, then centering function is provided, but insertion forces and running forces increase significantly
Solution Approach 1:
The centralizer transitions from a static compressed state during insertion to a dynamic deployed state during operation. The bow springs are initially compressed and locked in a low-profile configuration to minimize insertion forces, then selectively deployed at the target location to provide centering function, optimizing performance for both insertion and operation phases
Solution Approach 2:
The bow springs are pre-compressed and locked in a compact configuration before insertion. This preliminary action reduces the profile and minimizes frictional resistance during run-in, allowing the centralizer to pass through restrictions more easily before deployment at the desired location
2Length of moving object
If bow spring centralizers are compressed through tight restrictions, then insertion is achieved, but material deformation and integrity compromise occur
Solution Approach 1:
The centralizer employs a dynamic configuration system where the bow springs can transition between compressed and deployed states. During insertion through tight restrictions, the springs remain in a locked compressed state, protecting them from excessive compression that would cause material deformation or compromise integrity
Solution Approach 2:
The locking mechanism prevents premature deployment and protects the bow springs from excessive compression forces during insertion. By maintaining the springs in a controlled compressed state and preventing unintended expansion, the system counteracts the harmful effects of repeated compressions and decompressions that would compromise centralizer integrity
3Productivity
If bow spring centralizers are repeatedly compressed and decompressed, then passage through restrictions is achieved, but reliability and consistency of centering deteriorate
Solution Approach 1:
The bow springs are pre-compressed and locked in a compact configuration before insertion, allowing rapid passage through restrictions without repeated compression cycles. This preliminary compression eliminates the need for repeated compressions and decompressions during run-in, preserving spring integrity and ensuring consistent centering performance
Solution Approach 2:
The locking mechanism prevents premature or unintended deployment of the bow springs during insertion, protecting them from repeated compressions and decompressions that would compromise their elastic properties and centering consistency
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
The solution enables reduced insertion forces, preserves centralizer integrity, and maintains effective centering of the casing within the wellbore by maintaining a low-profile configuration until selective deployment, thereby enhancing the reliability of down-bore equipment and surfaces.
Implementation Method 1
the restorative forces of the springs to centralize the casing within the bore
Implementation Method 2
The locking mechanism can be released by controlled cyclical pressurization of the casing to actuate as described a rotational ratcheting release mechanism
Data Source
AI summary
A centralizer sub, and system, for enhanced access to subterranean zones from the surface as used in oil and gas wellbore installations to center a pipe or casing within a wellbore or previous casing string during run-in, installation, or cementing procedures. In under-reamed applications, casing strings and centralizers pass through a smaller casing string before opening up to a larger hole where repeated compressions and decompressions of bow strings of centralizers can compromise integrity and reliability. A centralizer sub, system, and method reduces and controls insertion and running forces to preserve centralizer integrity and down-bore surfaces and equipment.