Wireline Cased-Hole Roller Drag Reduction
Solution Overview
Problem
Wireline or slickline cables experience high drag and surface tension in cased-hole wellbores, leading to wear and tear on the wellbore and reduced overpull capacity, which can result in incomplete logging operations due to power exhaustion of motorized devices.
Innovation Solution
A wireline cased-hole roller (WCRO) device comprising cable insert halves, opposing body halves, and roller wheels, allowing for radial and axial movement, is coupled to the cable to reduce drag and tension by distributing the force and minimizing contact with the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireline or slickline cable is used in cased-hole wellbores with curves and bends, then logging operations can be performed, but high cable drag and surface tension occur leading to wear and damage
Solution Approach 1:
A cable stabilizer device is introduced as an intermediary component between the cable and the wellbore casing. The stabilizer includes a body with rollers that contact the casing inner surface, allowing the cable to move through curved sections with reduced friction. The stabilizer transfers the cable's motion to the casing through rolling contact rather than sliding contact, significantly reducing cable drag and surface tension while enabling logging operations in tortuous wellbores.
2Reliability
If higher grade cables are used to mitigate wear-and-tear, then cable durability improves, but additional cost is incurred
Solution Approach 1:
The cable stabilizer acts as a protective intermediary that reduces wear on the cable by eliminating direct high-friction sliding contact with the casing. The rollers in the stabilizer device reduce friction to rolling contact, significantly decreasing wear-and-tear on the cable. This allows the use of standard-grade cables instead of expensive higher-grade cables, reducing operational costs while maintaining cable durability.
3Ease of operation
If motorized tractors are used to push tools downhole, then logging tools can be delivered, but high cable drag causes power exhaustion before reaching target zone
Solution Approach 1:
The cable stabilizer serves as a mechanical intermediary that reduces the energy required to move the cable and attached tools through curved wellbore sections. By providing rolling contact surfaces (rollers) against the casing, the stabilizer converts high-friction sliding motion into low-friction rolling motion. This significantly reduces cable drag, allowing motorized tractors to deliver logging tools to target zones without power exhaustion.
4Object-affected harmful factors
If cable contact with casing is reduced, then wellbore damage and cable wear decrease, but device complexity increases
Solution Approach 1:
The cable stabilizer is divided into multiple independent components: a body structure, multiple rollers mounted on the body, and cable attachment mechanisms. The rollers are segmented and can rotate independently on their axes. This segmentation allows each component to perform its specific function (rollers reduce friction, body provides structure, attachment mechanisms secure the cable) while keeping the overall device relatively simple and maintainable.
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 WCRO significantly reduces cable drag and surface tension, minimizing wellbore damage and improving force transmission efficiency, enabling successful logging operations in tortuous sections without the need for higher power tractors.
Implementation Method 1
roller wheels, allowing for radial and axial movement... significantly reduces cable drag and surface tension
Data Source
AI summary
The present invention relates to a wireline cased-hole roller (WCRO) for deployment during a logging operation that reduces slickline or e-line cable contact and drag in the cased hole section of a wellbore. Arrays of WCROs, clamped on the slickline or e-line, reduce logging tensions and improve force transmission from surface down to the tool cable head by significantly reducing the cased-hole cable drag. They also permit the use of lower grade cables or winches in certain environments due to lower logging tensions. Another benefit is the mitigation of cased hole cable wear zones since the cable is suspended above the casing, liner or tubing. In high-angle or horizontal wells, arrays of WCROs aid conveyance and improve tractor performance by reducing the cable drag force which has to be overcome to reach the target zone.