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What are the best practices for wellbore cleanup after formation testing?

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Wellbore cleanup is a critical process to ensure the quality and reliability of formation testing and sampling operations. Formation testing and sampling involves lowering a tool into the wellbore to measure the pressure, temperature, and fluid properties of the reservoir, and to collect representative samples for further analysis. However, the wellbore may contain various contaminants, such as drilling fluids, solids, and debris, that can interfere with the accuracy and efficiency of the testing and sampling tool. Therefore, wellbore cleanup aims to remove or minimize these contaminants before or during the formation testing and sampling operation. In this article, we will discuss some of the best practices for wellbore cleanup after formation testing and sampling.

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Mahmoud Abdelrazik

Senior Offshore Drilling Supervisor
Samad Mulla

Trainee Petroleum Engineer | Quest Global | Unlocking the Future of Subsea Engineering, Production Optimization, and…

1 Select the appropriate cleanup method

Depending on the type and severity of the contamination, different methods of wellbore cleanup may be applied. Some of the common methods include circulating, spotting, jetting, and reverse circulating. Circulating involves pumping a fluid, such as water, brine, or solvent, through the wellbore to displace or dilute the contaminants. Spotting involves placing a fluid, such as acid, surfactant, or breaker, in a specific location in the wellbore to dissolve or break up the contaminants. Jetting involves using a high-pressure nozzle to spray a fluid, such as water or solvent, at the wellbore wall to dislodge or wash away the contaminants. Reverse circulating involves pumping a fluid, such as water or solvent, from the bottom to the top of the wellbore to flush out the contaminants.

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Samad Mulla

Trainee Petroleum Engineer | Quest Global | Unlocking the Future of Subsea Engineering, Production Optimization, and Artificial Lift Technologies | Strategic Innovator and Problem Solver
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Cleaning up the well after testing is like giving it a good wash. We use a special method called circulation, where we move lots of clean fluid to remove mud, debris, and anything left from the test. This keeps the well in good shape for future work.

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2 Optimize the cleanup parameters

The effectiveness of the wellbore cleanup depends on several parameters, such as the flow rate, pressure, volume, and temperature of the fluid, the duration and frequency of the cleanup operation, and the type and size of the nozzle. These parameters should be optimized based on the wellbore geometry, the reservoir characteristics, and the contamination level. For example, a higher flow rate may enhance the turbulence and shear stress in the wellbore, but it may also increase the erosion and damage to the wellbore and the formation. A longer duration may increase the removal efficiency, but it may also increase the cost and time of the operation. A smaller nozzle may increase the jetting force, but it may also increase the plugging risk.

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3 Monitor and evaluate the cleanup performance

To ensure that the wellbore cleanup achieves the desired results, it is important to monitor and evaluate the performance of the cleanup operation. This can be done by using various tools and techniques, such as sensors, gauges, logging, sampling, and testing. Sensors and gauges can measure the pressure, temperature, flow rate, and density of the fluid in the wellbore during the cleanup operation. Logging can provide information about the wellbore condition, such as the borehole diameter, the wall roughness, and the formation integrity. Sampling can collect fluid samples from the wellbore for laboratory analysis, such as the viscosity, density, pH, and contamination content. Testing can assess the quality and reliability of the formation testing and sampling tool after the cleanup operation, such as the pressure and temperature measurement accuracy, the fluid sampling efficiency, and the sample representativeness.

Wellbore cleanup is a vital step to ensure the success of formation testing and sampling operations. By following the best practices for wellbore cleanup, you can improve the quality and reliability of the data and samples obtained from the reservoir, and ultimately, enhance the reservoir understanding and management.

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4 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Mahmoud Abdelrazik

Senior Offshore Drilling Supervisor
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A poorly cleaned wellbore can damage equipment, cause production losses and damage the formation by restricring reservoir fluidflow also damag fragile formations and increase the risk of leaving bypassed completion fluid. Clean up brine, remaining drilling fluids, LCM (if pumped during drlg) acid, acid reaction, cutting, debris is critical and faster clean up of them generate earlier return and reduce extra operation NPT. CT with pumping N2 to provide a controlled lift of the wellbore fluids, a multiphase flow meter to monitor from surface the results, and model the process in real-time. Also chemically by pumping specific chemical to dissolve any debris. Now challenges focus on clean-up low K reservoirs, horizontal and ERD wells.

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What are the best practices for wellbore cleanup after formation testing?

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1 Select the appropriate cleanup method

2 Optimize the cleanup parameters

3 Monitor and evaluate the cleanup performance

4 Here’s what else to consider

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