Spotting Fluid Composition for Drill String Sticking
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Solution Overview
Problem
Drill string sticking poses significant challenges in subterranean operations due to differential and mechanical sticking, often requiring ineffective or environmentally non-compliant spotting fluids, which can compromise well control and safety.
Innovation Solution
A spotting fluid composition comprising a water insoluble external phase fluid, a water soluble internal phase fluid, and an ether carboxylic acid emulsifying agent, along with optional viscosifiers, weighting agents, and wetting agents, is introduced to the drill string vicinity to reduce sticking by acting as a lubricant and dehydrating the filter cake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spotting fluids are used to free stuck drill string, then the drill string can be freed from differential sticking, but the emulsifying agents in the spotting fluid may not be compatible with higher environmental standards
Solution Approach 1:
The patent changes the chemical parameters of the spotting fluid by using biodegradable emulsifying agents instead of traditional non-biodegradable agents. This substitution maintains the fluid's effectiveness in freeing stuck pipe while improving its environmental compatibility and biodegradability characteristics
Solution Approach 2:
The spotting fluid is formulated as a composite system containing biodegradable emulsifying agents combined with other functional components. This composite approach allows the fluid to achieve both the mechanical performance needed for pipe freeing and the environmental performance required by modern regulations
2Reliability
If hydrostatic pressure is lowered to free stuck pipe, then the drill string may be freed from differential sticking, but well control may be compromised
Solution Approach 1:
The spotting fluid acts as an intermediary substance placed between the drill string and the filter cake. Instead of changing well pressure conditions, the spotting fluid directly addresses the sticking mechanism by dehydrating the filter cake and reducing adhesion forces, thereby freeing the pipe while maintaining safe well control pressures
3Force
If shock force is applied to free stuck pipe, then mechanical jarring may free the pipe, but the shock force often does not suffice to free the stuck pipe
Solution Approach 1:
The patent replaces the mechanical shock force approach with a chemical mechanism. The spotting fluid uses dehydration and lubrication chemistry to reduce adhesion forces between the drill string and filter cake, providing a more reliable and controlled method for freeing stuck pipe compared to unpredictable mechanical jarring
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 composition effectively reduces drill string sticking by providing desirable rheological and environmental properties, ensuring efficient pipe freeing while adhering to environmental standards, thus minimizing operational disruptions and environmental impact.
Implementation Method 1
a spotting fluid composition comprising a water insoluble external phase fluid, a water soluble internal phase fluid, and an ether carboxylic acid emulsifying agent
Implementation Method 2
Spotting fluids may act to assist in reducing the differential sticking problem encountered by drill strings by, among other things, acting as a lubricant
Implementation Method 3
acting as a lubricant and/or by dehydrating the filter cake formed around the stuck portion of the drill string
Data Source
AI summary
Fluids and associated methods useful in subterranean applications are provided. More particularly, methods of reducing drill string sticking are provided, which include: providing a spotting fluid composition comprising a water insoluble external phase fluid, a water soluble internal phase fluid, and an ether carboxylic acid emulsifying agent; introducing the spotting fluid to the vicinity of a desired portion of a drill string; and allowing the spotting fluid to interact with a portion of material surrounding the desired portion of the drill string spotting fluid. Compositions are provided that may be useful in subterranean applications for addressing, among other things, drill string sticking problems. Additional optional components may be used, such as viscosifiers, weighting agents, and wetting agents.