Variable Density Drilling Mud Particle Separation
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Solution Overview
Problem
The challenge in drilling operations for hydrocarbons is maintaining the density of drilling mud within the pore pressure gradient (PPG) and fracture pressure gradient (FG) to prevent well kicks and mud loss, while reducing the number of casing strings and managing compressible particles in variable density drilling mud.
Innovation Solution
A system and method involving a wellbore with a variable density drilling mud containing compressible particles, a bottom hole assembly, and a drilling mud processing unit that separates and recirculates these particles to maintain mud density between PPG and FG, using a combination of shaker screens, hydrocyclones, and centrifuges to manage the particles and ensure effective mud circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable density drilling mud with compressible particles is used to maintain mud weight between PPG and FG, then drilling depth increases and number of casing strings reduces, but compressible particles accumulate and require complex separation and recirculation systems
Solution Approach 1:
The patent extracts compressible particles from the drilling mud using separation equipment (shaker screens, hydrocyclones, centrifuges) and removes them from the circulation system. This allows the mud to be recirculated without the compressible particles, preventing accumulation while maintaining the variable density functionality during active drilling.
Solution Approach 2:
The patent discards compressible particles after they have served their purpose of maintaining mud weight between PPG and FG, and recovers them through separation equipment. The particles are removed from circulation, effectively discarded from active use, but can be recovered and potentially reused or properly disposed of, managing the complexity of having compressible particles in the system.
2Reliability
If compressible particles are circulated in variable density drilling mud, then mud density is maintained within PPG and FG, but particles require separation to prevent damage and ensure continuous operation
Solution Approach 1:
The separation equipment (shaker screens, hydrocyclones, centrifuges) automatically separates compressible particles from the drilling mud based on their physical properties (size, density). The system performs self-service by continuously removing particles without requiring manual intervention, maintaining reliable mud density control while simplifying particle management through automated separation processes.
3Ease of operation
If larger initial casing strings are used to provide sufficient wellbore diameter for tools, then tool access is ensured, but drilling cost increases due to larger casing and cement volumes
Solution Approach 1:
The patent changes the density parameter of the drilling mud by incorporating compressible particles that expand and contract based on pressure. This allows the mud to provide sufficient hydrostatic pressure in larger wellbores, enabling the use of smaller casing strings while still ensuring proper tool access and wellbore stability, thereby reducing the quantity of casing and cement required.
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
This approach allows for deeper drilling with fewer casing strings, reduces mud loss, and maintains hydrostatic pressure, enhancing drilling efficiency and reducing operational costs by effectively managing compressible particles and mud density.
Implementation Method 1
a drilling mud processing unit in fluid communication with the wellbore. The variable density drilling mud has compressible particles and drilling fluid. The bottom hole assembly is coupled to the drilling pipe, while the drilling mud processing unit is configured to separate the compressible particles from the variable density drilling mud
Implementation Method 2
The compressible particles in this embodiment may include compressible hollow objects filled with pressurized gas and configured to maintain the mud weight between the fracture pressure gradient and the pore pressure gradient
Data Source
AI summary
A method and system for drilling a wellbore is described. The system includes a wellbore with a variable density drilling mud, drilling pipe, a bottom hole assembly disposed in the wellbore and a drilling mud processing unit in fluid communication with the wellbore. The variable density drilling mud has compressible particles and drilling fluid. The bottom hole assembly is coupled to the drilling pipe, while the drilling mud processing unit is configured to separate the compressible particles from the variable density drilling mud. The compressible particles in this embodiment may include compressible hollow objects filled with pressurized gas and configured to maintain the mud weight between the fracture pressure gradient and the pore pressure gradient. In addition, the system and method may also manage the use of compressible particles having different characteristics, such as size, during the drilling operations.