Friction Reducer Compositions for Lateral Wellbore Pressure Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Poor fluid distribution along the lateral segment and into the toe of a wellbore in unconventional subterranean formations leads to decreased hydrocarbon recovery, necessitating improved fluid distribution and pressure management.
Innovation Solution
Injecting an aqueous fluid containing a friction reducer, such as polyacrylamides or polyvinyl alcohol, into the wellbore to decrease pressure drop and enhance fluid distribution, using fiber optic equipment for monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If water or conventional fluids are injected into the wellbore, then fluid injection is performed, but pressure drop along the lateral segment is high and fluid distribution is poor
Solution Approach 1:
The patent changes the physical-chemical parameters of the injection fluid by adding friction reducer polymers (such as polyacrylamides, polyvinyl alcohol, or their copolymers) to the aqueous fluid. This modification alters the fluid's rheological properties, enabling it to reduce drag and friction along the wellbore walls, thereby decreasing pressure drop and improving fluid distribution into the toe of the wellbore.
Solution Approach 2:
The friction reducer acts as an intermediary substance between the injection fluid and the wellbore walls. These polymer molecules adsorb onto the wellbore surface and modify the fluid-wall interaction, reducing friction and drag forces. This intermediary mechanism allows the fluid to flow more efficiently with lower pressure loss along the lateral segment.
2Stress or pressure
If friction reducers are added to the aqueous fluid, then drag reduction of 50-95% is achieved, but fluid composition becomes more complex
Solution Approach 1:
The friction reducers are applied locally at the wellbore-fluid interface rather than requiring complex bulk fluid modification. The polymers concentrate at the boundary layer between the fluid and wellbore walls, providing drag reduction effects with relatively low concentrations (typically 1-100 ppm), thus achieving pressure drop reduction without significantly complicating the overall fluid composition.
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 method achieves a drag reduction percentage of 50% to 95%, reducing pressure drop and improving fluid distribution, thereby increasing hydrocarbon production.
Implementation Method 1
injection of the aqueous fluid can decrease pressure drop along the lateral segment of the wellbore. The decrease in pressure drop along the lateral segment of the wellbore can be measured as a drag reduction percentage (DR %)
Implementation Method 2
aqueous fluid can include a well treatment agent; and a friction reducer in a concentration of from 0.1 to 5 gpt
Data Source
AI summary
Described are compositions and methods for use in oil and gas operations. The methods can decrease pressure drop along a lateral segment of a wellbore in an unconventional subterranean formation.