Negative Pressure Shaker with Integrated Gas-Liquid Separation
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Solution Overview
Problem
Existing solids control technologies for oil drilling face challenges with high liquid content in drill cuttings, costly and complex vacuum filtration equipment, short screen lifespan, high power consumption, and inefficient gas-liquid separation systems.
Innovation Solution
A negative pressure shale shaker integrated with negative pressure generation and gas-liquid separation, featuring a screen frame assembly, liquid mist separator, negative pressure automatic drainage device, and vacuum pan, which allows for efficient liquid mist separation and reduced power consumption, with the option to work in both negative pressure and regular modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vacuum filtration-based drilling fluid solid-liquid separation equipment is used, then liquid content in drill cuttings can be reduced to below 40%, but the equipment has complex structure, high cost, and short screen lifespan
Solution Approach 1:
The patent combines the vacuum pan, gas-liquid separation system, and drainage system into an integrated unit. The vacuum pan serves both as a collection chamber and as part of the gas-liquid separation system, eliminating the need for separate complex vacuum filtration equipment while achieving the same liquid content reduction effect.
Solution Approach 2:
The vacuum pan is designed to perform multiple functions: collecting drilling fluid, generating negative pressure, separating gas from liquid, and facilitating drainage. This multi-functionality replaces the need for multiple separate pieces of equipment, simplifying the overall system structure.
2Stress or pressure
If compressed air jet is used to generate negative pressure, then higher degree of vacuum can be generated, but liquid mist occurs and safety hazard increases
Solution Approach 1:
The patent introduces a gas-liquid separation system as an intermediary between the negative pressure generation and the drilling fluid handling. This separation system uses a water seal and cyclonic separation to intercept and remove liquid mist before it can cause safety hazards, while still allowing high vacuum degrees to be achieved.
Solution Approach 2:
The patent converts the harmful liquid mist generated during high-vacuum operation into a beneficial separation process. By using the cyclonic separation effect, the liquid mist is redirected into the vacuum pan for collection, transforming a safety hazard into an effective liquid removal mechanism.
3Quantity of substance
If vacuum suction method is used, then drilling fluid can be separated, but large-sized gas-liquid separation system is required with low separation efficiency
Solution Approach 1:
The patent nests the gas-liquid separation system within the vacuum pan structure. The separation system is integrated into the vacuum pan chamber, allowing the separation process to occur within the existing volume rather than requiring a separate large-sized system. This nesting approach reduces overall system volume while maintaining separation efficiency.
4Productivity
If traditional shale shaker is used, then drill cuttings can be screened, but liquid content in discharged drill cuttings remains high
Solution Approach 1:
The patent implements continuous negative pressure action throughout the drilling fluid handling process. Unlike intermittent vacuum filtration, the continuous negative pressure ensures that liquid is continuously removed from drill cuttings as they pass through the screen, maintaining high processing capacity while continuously reducing liquid content in the discharged material.
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 solution significantly reduces liquid content in drill cuttings, extends screen lifespan, enhances processing capacity, and improves safety and efficiency, achieving more than twice the processing capacity of conventional shale shakers while reducing costs and power consumption.
Implementation Method 1
a negative pressure fan 16... a vacuum pan 10... gas is discharged through the vertical channel... so as to implement negative pressure generation and gas-liquid separation
Implementation Method 2
a liquid mist separator 12... the horizontal channel communicates with adjacent vertical channels... gas is discharged through the vertical channel
Data Source
AI summary
A negative pressure shale shaker integrated with negative pressure generation and gas-liquid separation includes a base, a liquid inlet buffer tank, a screen frame assembly, a support frame, a vacuum hose, a damping spring, a screen frame inclination angle adjustment device, a drainage hose, a negative pressure automatic drainage device, a vacuum pan, a three-way pipe, a liquid mist separator, a connecting pipe, a vacuum pressure limiting valve, a silencer and a negative pressure fan. A drilling fluid containing cuttings, after entering the screen with a negative pressure thereunder, rapidly passes through the screen along with air into a vacuum chamber. The air in the vacuum chamber is directly drawn away through holes formed on the side plates of the screen frame by the negative pressure fan.