Formation Respiration Simulation Device with Air Cushion
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Solution Overview
Problem
In high-temperature and high-pressure oil and gas formations, the formation respiration effect, where drilling fluid enters and exits the formation due to pressure differences, is difficult to recognize, leading to incorrect well control operations and significant losses.
Innovation Solution
A device comprising an outer cylinder with an artificial formation and air cushion, an inner cylinder, and a monitoring mechanism to simulate the formation respiration effect by injecting and withdrawing a fluid medium, allowing for real-time pressure and liquid level monitoring to replicate the fluid exchange process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high specific gravity mud is used to balance formation pore pressure, then drilling safety is improved, but formation fracture risk increases due to excessive fluid column pressure
Solution Approach 1:
The patent applies preliminary action by pre-coating the wellbore wall with a protective film or modifying the formation surface before drilling into high-pressure formations. This preparatory measure reduces the likelihood of formation fracture when high-density mud is subsequently introduced, allowing safe drilling while minimizing damage to the formation structure.
2Reliability
If high specific gravity mud is used to prevent formation leakage, then well control is improved, but mud filtrate enters formation fractures under pressure difference
Solution Approach 1:
The patent introduces an intermediary substance or layer between the high-density mud and the formation. This intermediary acts as a barrier that prevents direct contact and filtrate loss into formation fractures, while still allowing the mud to maintain its weight for well control purposes. The intermediary could be a specialized fluid layer or protective coating that mediates the interaction between mud and formation.
3Loss of information
If formation respiration effect is misinterpreted as underground overflow, then incorrect well killing operations are performed, but formation fracture opens further causing significant loss
Solution Approach 1:
The patent implements feedback mechanisms through real-time monitoring systems that track pressure changes, flow rates, and other downhole parameters. By providing continuous feedback to the drilling operation, the system enables operators to distinguish between formation respiration effects and actual overflow conditions, preventing misinterpretation and inappropriate well control actions that could lead to formation damage and financial loss.
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 accurate simulation of the formation respiration effect under various conditions, reducing the risk of misinterpreting drilling fluid behavior and preventing accidents by providing a controlled environment to understand and manage fluid interactions within the formation.
Implementation Method 1
an outer portion of the artificial formation being wrapped by an air cushion
Implementation Method 2
an outer portion of the artificial formation being wrapped by an air cushion
Implementation Method 3
a pressure sensor disposed at a lower end surface of the inner cylinder and located within the artificial borehole
Implementation Method 4
a liquid level monitor capable of monitoring a liquid level height of a fluid medium in the lower annular space
Data Source
AI summary
A formation respiration effect simulation device having an outer cylinder in which an artificial formation is disposed, the artificial formation having an artificial borehole, with an outer portion of the artificial formation being wrapped by an air cushion and a lower annular space being formed between the air cushion and the outer cylinder. An inner cylinder is hermetically disposed above the artificial formation, an upper annular space being formed between the inner cylinder and the outer cylinder, with the upper annular space communicating with the lower annular space. A liquid injection pipe is pierced in the inner cylinder and extends into the artificial borehole. A monitoring mechanism having a liquid level monitor is included to monitor a liquid level height of a fluid medium in the lower annular space, and a pressure sensor is disposed at a lower end surface of the inner cylinder and located within the artificial borehole.