Acryloylmorpholine Polymer Filtrate Reducer for Drilling Fluids

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Solution Overview

Problem

Existing filtrate reducers for drilling fluids face challenges in providing adequate high temperature resistance and salt resistance, especially in deep and ultra-deep wells, and they often increase the viscosity of drilling fluids, making it difficult to control properties, particularly in high calcium and magnesium content environments, and can cause well instability and contamination in shale gas drilling.

Innovation Solution

An acryloylmorpholine polymer is developed, comprising specific structural units that undergo cross-linking reactions to form a filtrate reducer with enhanced filtrate reduction and viscosity increasing effects, suitable for high temperature and high salinity conditions, prepared through a method involving olefinic polymerization and cross-linking reactions in an aqueous solvent.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the dosage of existing filtrate reducer is increased to improve high temperature resistance and salt resistance performance, then the filtrate reduction performance is improved, but the viscosity of drilling fluid increases making it difficult to control properties

Engineering Contradiction:

Improvefiltrate reduction performanceVSAvoidviscosity control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention changes the chemical structure parameters of the polymer by introducing cross-linked structural units with specific functional groups that enhance filtrate reduction capability at lower dosages, thereby improving reliability without excessively increasing viscosity and maintaining ease of operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite polymer structure combining linear structural units with cross-linked structural units, where the cross-linked units provide enhanced filtrate reduction performance while the linear units maintain fluidity, achieving both improved reliability and controlled viscosity

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If existing filtrate reducer is used in high calcium and magnesium content drilling fluid, then the drilling fluid can be stabilized, but the viscosity control becomes more difficult

Engineering Contradiction:

Improvedrilling fluid stabilityVSAvoidviscosity control

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The invention introduces cross-linked structural units with specific functional groups at localized positions within the polymer chain that selectively interact with calcium and magnesium ions, providing stability enhancement at specific sites without causing uniform viscosity increase throughout the drilling fluid

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If water-based drilling fluid is used in shale gas drilling, then environmental pollution is reduced and cost is lowered, but water loss or dehydration phenomenon occurs when exposed to high salinity

Engineering Contradiction:

Improveenvironmental pollution and costVSAvoidfiltrate reduction performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention modifies the chemical parameters of water-based drilling fluid by adding a polymer with cross-linked structural units containing functional groups that form protective films on shale surfaces, preventing water loss and dehydration in high salinity environments while maintaining the environmental and cost advantages of water-based fluids

Inventive Principle:

Principle #35Parameter changes

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 acryloylmorpholine polymer filtrate reducer demonstrates significant filtrate reduction and viscosity increase, maintaining performance in high temperature and high salinity conditions, reducing filter loss and increasing apparent and plastic viscosity, thus addressing the limitations of existing technologies in deep and ultra-deep well drilling.

Implementation Method 1

prepared through a method involving olefinic polymerization and cross-linking reactions

Methodology Applied

Scientific EffectOlefinic polymerization: Chemical Bonding

Implementation Method 2

at least a part of the structural units expressed by formula (2) are bonded with at least a part of the structural units expressed by formula (3) into cross-linked structural units expressed by formula (4)

Methodology Applied

Scientific EffectCross-linking reaction: Chemical Bonding

Data Source

PatentUS9085722B2Acryloylmorpholine polymer and use thereof and filtrate reducer for drilling fluid

Publication Date: 2015.07.21 CHINA PETROLEUM & CHEMICAL CORP

AI summary

The present invention provides an acryloylmorpholine polymer and the use thereof and a filtrate reducer for drilling fluid. The acryloylmorpholine polymer comprises structural units expressed by formula (1), structural units expressed by formula (2), and structural units expressed by formula (3), wherein, at least a part of the structural units expressed by formula (2) can be bonded with at least a part of the structural units expressed by formula (3) into cross-linked structural unit expressed by formula (4); wherein, R1-R9 are H or C1-C3 linear or branched alkyl respectively, y is an integer within 1-5 range, M is H or an alkali metal element, X is O or NH, and R10 is C1-C5 linear or branched alkylidene. The acryloylmorpholine polymer and filtrate reducer for drilling fluid have outstanding filtrate reduction and viscosity increasing effects.