Seismic Receiver Cooling in High-Temperature Wells

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Solution Overview

Problem

High temperatures in downhole wells significantly reduce the performance life of electrical components used for monitoring microseismic signals during formation fracturing, leading to failure and measurement errors due to overheating.

Innovation Solution

A system that uses a cooling fluid, such as a friction-reduced coolant or KCl-brine solution, to maintain seismic receivers at a suitable temperature, allowing them to operate effectively during fracturing operations by circulating the coolant and modeling the cool-down and heat-up cycles to optimize microseismic signal detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical components are used for monitoring in high temperature wells, then microseismic signals can be detected, but the components overheat and fail due to temperatures exceeding 150°C

Engineering Contradiction:

Improvecomponent reliabilityVSAvoiddownhole temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

A cooling fluid is introduced as an intermediary substance between the high-temperature environment and the electrical components. The fluid circulates through a cooling system, absorbing heat from the components and transporting it away, thereby maintaining operational temperatures and preventing failure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a hydraulic cooling system where fluid is pumped through tubing and annular spaces to remove heat from electrical components. This fluid circulation mechanism uses hydraulic principles to continuously transfer thermal energy from the components to the surrounding environment.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Temperature

If cooling fluid is circulated through tubing string, then seismic receivers are cooled to suitable temperatures, but friction increases and reduces cooling efficiency

Engineering Contradiction:

Improvereceiver temperatureVSAvoidcooling energy loss

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The patent replaces conventional mechanical cooling systems with a chemically-enhanced cooling fluid system. By adding friction-reducing chemicals to the cooling fluid, the system reduces viscous losses and improves flow efficiency without requiring additional mechanical components or increasing pump power.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cooling fluid's chemical composition is modified by adding friction-reducing agents, which changes its rheological parameters. This parameter change reduces the fluid's frictional resistance during circulation, improving cooling efficiency and reducing energy losses in the hydraulic system.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If measurement is taken in high temperature environment, then fracturing monitoring is performed, but signal levels are too low for accurate detection

Engineering Contradiction:

Improvesignal detection accuracyVSAvoidtemperature interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The cooling system is activated before measurement begins, pre-cooling the electrical components and their housing. This preliminary cooling action establishes a stable thermal baseline, reducing thermal drift and noise during the actual measurement process, thereby improving signal detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cooling system provides localized cooling directly at the components that generate or process signals. By concentrating cooling capacity where thermal effects most impact measurement quality, the system maintains optimal operating temperatures for sensitive electronics without requiring uniform cooling throughout the entire wellbore environment.

Inventive Principle:

Principle #3Local quality

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 system effectively extends the operational life of seismic receivers in high-temperature environments, enabling reliable detection of microseismic signals and reducing measurement errors, thereby enhancing the monitoring of fracturing processes.

Implementation Method 1

circulating coolant fluid through the tubing string

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

friction-reduced coolant

Methodology Applied

Scientific EffectFriction reduction: Friction

Data Source

PatentUS8631867B2Methods for cooling measuring devices in high temperature wells

Publication Date: 2014.01.21 HALLIBURTON ENERGY SERVICES INC

AI summary

A method for monitoring a fracturing operation in a target well comprising extending a seismic sensor in a tubing string to a first position in an well offset from the target well. A coolant fluid is circulated through the tubing string for a predetermined time. The tubing string is retracted to a second uphole position such that the cooled seismic sensor is exposed in the offset wellbore. A seismic signal emitted during the fracturing operation of the target well is sensed in the offset well.