Downhole Fluid Injection Piston Chamber
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Solution Overview
Problem
Traditional pump systems used in oil and gas exploration are limited in their ability to control and achieve a wide range of flow rates during fluid injection into subterranean formations, which is essential for accurate formation evaluation and production predictions.
Innovation Solution
A downhole tool with a sample chamber divided into two chambers by a piston, where the first chamber holds an injection fluid at a specific pressure and the second chamber is filled with a drive fluid at a higher pressure, utilizing a flow regulator and valves to control the injection of fluids into the formation, allowing for precise flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pump systems are used for fluid injection, then the system structure is simple, but the flow rate control range and precision are limited
Solution Approach 1:
The sample chamber is divided into two separate chambers: a first chamber for holding injection fluid and a second chamber for receiving drive fluid. This segmentation allows independent control of injection fluid pressure and drive fluid pressure, enabling precise flow rate control by regulating the drive fluid pressure independently from the injection fluid storage.
Solution Approach 2:
A piston is introduced as an intermediary component between the first chamber (injection fluid) and the second chamber (drive fluid). The piston transmits pressure from the drive fluid to the injection fluid while maintaining fluid isolation, allowing indirect control of injection flow rate through drive fluid pressure regulation without direct mixing or contamination.
2Adaptability or versatility
If a single chamber system is used, then the device complexity is low, but the ability to control flow rates across a wide range is limited
Solution Approach 1:
The sample chamber is segmented into a first chamber for injection fluid and a second chamber for drive fluid, allowing independent pressure control and enabling a wider range of flow rates by adjusting drive fluid pressure independently.
Solution Approach 2:
The system incorporates dynamic pressure control by allowing the drive fluid pressure to be adjusted independently and continuously, enabling the flow rate to be varied across a wide range during formation injection according to evaluation requirements.
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
Enables precise control over fluid flow into subterranean formations, enhancing formation evaluation and production predictions by ensuring accurate injection and measurement capabilities.
Implementation Method 1
a first chamber (702) holding an injection fluid (722) at a first pressure, and a second chamber (703) receiving a drive fluid (743) at a second pressure
Data Source
AI summary
Downhole tools and methods are provided for injecting fluid into a formation. A downhole tool may include a first chamber of injection fluid separated from a second chamber of working fluid by a piston. The working fluid may be employed to apply pressure to the piston to direct injection fluid from the first chamber to the formation. A flow regulator may regulate flow of the injection fluid from the first chamber to the formation.