Production Logging Tool Centralizer Deploying Arms
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Solution Overview
Problem
Current production logging tools face challenges in accurately monitoring multiphase fluid mixtures in complex hydrocarbon wells due to harsh downhole conditions, limited imaging capabilities, and complex designs, which result in reliability issues and high costs, especially in deviated and horizontal wells.
Innovation Solution
A production logging tool with a central pressure-resistant housing and a deploying arrangement of circumferentially distributed centralizer and deploying arms, equipped with downhole fluid properties analysis probes that can be radially and angularly positioned to effectively analyze multiphase fluid mixtures, providing comprehensive coverage and robust operation in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If production logging tools are deployed in deviated and horizontal wells to monitor multiphase fluid mixtures, then accurate phase detection and flow rate monitoring are achieved, but the tool complexity and deployment difficulty increase due to harsh downhole conditions and fluid segregation
Solution Approach 1:
The tool is divided into multiple functional modules including a centralizer assembly with radial arms, a deploying mechanism with deploying arms, and multiple probe types (capacitive, conductive, optical, ultrasonic, spinner) that can be independently positioned. Each module performs a specific function, allowing the complex measurement task to be broken down into manageable components that can be optimized independently
Solution Approach 2:
The tool employs dynamic positioning mechanisms where centralizer arms can radially extend and retract, and deploying arms can position probes at different angular and radial positions. This dynamic capability allows the tool to adapt to varying well conditions (deviated vs horizontal) and optimize probe positioning for accurate multiphase flow measurement without requiring a completely different tool design
2Measurement precision
If multiple probes are deployed to achieve comprehensive wellbore coverage in deviated wells, then accurate imaging and flow regime detection are improved, but the tool weight and deployment difficulty increase
Solution Approach 1:
The deploying arms are nested within the centralizer arms, and probes are mounted on the deploying arms. This nested configuration allows multiple probes to be positioned in a compact arrangement that minimizes tool diameter and weight while still achieving comprehensive circumferential coverage when deployed. The nested structure reduces the overall tool envelope compared to having all probes extended at full radius simultaneously
3Reliability
If the tool is designed to operate in harsh downhole conditions (high pressure, temperature, corrosive fluids), then reliability is improved, but the material selection and manufacturing complexity increase
Solution Approach 1:
The tool employs materials and seal designs selected for specific pressure and temperature ranges. The centralizer and deploying mechanisms are designed with clearances and tolerances that accommodate thermal expansion and pressure-induced deformation. Probe housings are selected from materials resistant to corrosive downhole fluids (H2S, CO2), and sealing systems are designed to maintain integrity under high pressure (up to 2000 bars) and temperature (up to 200°C) conditions
4Measurement precision
If the tool uses a robust centralizer and deploying mechanism to ensure stable probe positioning, then measurement accuracy is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The centralizer and deploying mechanisms are designed as modular assemblies that can be independently inspected and maintained. The radial arms, deploying arms, and probe mounts are separate components that can be replaced or repaired without replacing the entire tool. This segmentation simplifies maintenance procedures and reduces downtime between logging operations
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A production logging tool (1) has an elongated cylindrical housing (10, 12, 13, 14) shape and comprises a centralizer arrangement (11) comprising multiple external centralizer arms (15, 16) and operable from a retracted configuration into a radially extended configuration, the centralizer arms (15, 16) being coupled at a first side to the housing (10, 12, 13, 14) and at a second side to a first sliding sleeve (21) and a deploying arrangement (30) nested within the centralizer arrangement (11), the deploying arrangement (30) comprising: a plurality of deploying arms (31, 32) circumferentially distributed about said housing (10, 12, 13, 14) and being coupled at a first side to the housing (10, 12, 13, 14) and at a second side to the centralizer arrangement (11) by means of at least one second sliding sleeve (36), wherein the second sliding sleeve (36) comprises a mechanical coupler (39) coupled to the first sliding sleeve (21).