Environmental Sensing Wireline Standoff for Borehole Sticking
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Solution Overview
Problem
Wireline cables and logging tools often become stuck in boreholes due to differential sticking and cable key-seating, which can lead to canceled surveys and fishing operations, especially in deviated or directional wells where the cable exerts significant sideways thrust and forms grooves in the borehole wall.
Innovation Solution
An environmental sensing wireline standoff is used, comprising a lower body, an upper body, and a cable insert that clamps onto the wireline cable, reducing direct contact with the borehole wall by spacing the cable away from the wall, thereby minimizing sticking forces and friction, and equipped with sensors to record cable dynamics and borehole properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireline cable is allowed to contact the borehole wall directly, then the cable can be positioned stably, but the cable becomes stuck due to differential sticking and key-seating
Solution Approach 1:
The standoff device acts as an intermediary between the wireline cable and the borehole wall. It includes a cable-clamping mechanism that secures the cable and a standoff body with sensors that interface with the borehole environment, thereby preventing direct contact between the cable and borehole wall while maintaining stable positioning and enabling data collection
Solution Approach 2:
The standoff device segments the cable system by introducing a separate mechanical component (the standoff) that detaches the cable from direct wall contact. The device comprises distinct functional segments: a cable clamping section, a standoff body section with sensors, and a positioning mechanism, allowing the cable to be secured without bearing the full mechanical load against the borehole wall
2Reliability
If the wireline cable exerts sideways thrust against the borehole wall, then the cable maintains position in deviated wells, but grooves are cut into the borehole wall causing cable key-seating
Solution Approach 1:
The standoff body serves as an intermediary that distributes the sideways thrust forces. Instead of the cable concentrating force on a small contact area and cutting grooves, the standoff's broader base distributes the load across a larger area of the borehole wall, reducing pressure intensity and preventing groove formation
Solution Approach 2:
The invention changes the contact parameters between the cable system and borehole wall. By introducing the standoff with its specific geometry and material properties, the contact area is increased and the contact pressure is reduced, transforming the interaction from a high-stress point contact that cuts grooves to a lower-stress distributed contact that prevents wall damage
3Use of energy by moving object
If the wireline cable remains in contact with the borehole wall, then the cable is supported, but friction and sticking forces increase
Solution Approach 1:
The standoff device introduces a low-friction interface between the cable system and borehole environment. The standoff body, with its specific surface characteristics and geometry, reduces the coefficient of friction compared to direct cable-wall contact, thereby decreasing the energy required to move the cable and reducing sticking forces
Data Source
AI summary
The use of an environmental sensing wireline standoff may improve operations during borehole logging procedures. An environmental sensing wireline standoff may comprise a lower body, an upper body, and a cable insert. The cable insert may further comprise a first segment and a second segment, wherein the cable insert is disposed between the lower body and the upper body, and wherein the cable insert is configurable to clamp directly onto a wireline cable. The environmental sensing wireline standoff may further comprise a sensor package. A method of assembling an environmental sensing wireline standoff may comprise securing a first segment of a cable insert into a lower body, securing a second segment of the cable insert into an upper body, attaching the sensor package to the upper body, and securing the lower body to the upper body.