Clay-Free Drilling Fluid Additive Composition for High Temperature Resistance
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Solution Overview
Problem
Conventional whole-oil-based drilling fluids with organic clay additives suffer from poor temperature resistance and reservoir damage due to clay's inability to withstand high temperatures and its potential to contaminate oil and gas reservoirs.
Innovation Solution
A clay-free drilling fluid additive composition comprising a dimer acid-organic amine copolymer as a rheological modifier, modified polysiloxane nano-particles as a tackifier, and specific emulsifiers with a comb-like structure, which synergistically enhance suspending power and temperature resistance up to 220°C or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If organic clay is added to whole-oil-based drilling fluid to improve suspending power, then suspending power is improved, but temperature resistance deteriorates
Solution Approach 1:
The invention removes organic clay from the drilling fluid system entirely. Instead of using organic clay to provide suspending power, the patent uses a combination of emulsifier, rheological modifier, and tackifier that work synergistically to achieve both suspending power and high temperature resistance without any clay components.
Solution Approach 2:
The invention creates a composite additive system consisting of emulsifier, rheological modifier, and tackifier that work together to provide multiple functions simultaneously. This composite approach replaces the single-component organic clay system, achieving both suspending power and temperature resistance through the synergistic interaction of multiple specialized components.
2Stability of the object's composition
If organic clay is added to whole-oil-based drilling fluid to improve suspending power, then suspending power is improved, but reservoir contamination occurs
Solution Approach 1:
The invention extracts and removes organic clay from the drilling fluid formulation. By eliminating clay entirely and replacing it with synthetic additives (emulsifier, rheological modifier, and tackifier), the system achieves suspending power without the harmful side effect of clay entering and damaging the reservoir.
3Device complexity
If high oil-water ratio is used in whole-oil-based drilling fluid to maintain system simplicity, then system simplicity is maintained, but suspending power deteriorates
Solution Approach 1:
The invention makes each additive component perform multiple functions. The emulsifier not only maintains emulsion stability but also contributes to suspending power. The rheological modifier and tackifier work together to enhance both suspension capability and temperature resistance. This multi-functionality allows the system to maintain simplicity with high oil-water ratio while achieving good suspending power.
Solution Approach 2:
The patent uses a composite additive system where emulsifier, rheological modifier, and tackifier work synergistically. This composite approach enables the drilling fluid to achieve adequate suspending power with high oil-water ratio, eliminating the need for complex clay-based skeletal structures.
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 achieves desirable suspending power and high temperature resistance, preventing clay-related issues while maintaining drilling fluid stability and preventing reservoir contamination.
Implementation Method 1
the rheological modifier is a dimer acid-organic amine copolymer comprising structural units from dimer acid, structural units from alkylamine and structural units from arylamine
Implementation Method 2
the tackifier are modified polysiloxane nano-particles having a modifying Z group
Implementation Method 3
the emulsifier is one or more of the compounds represented by the following Formula (1)
Implementation Method 4
the clay-free whole-oil-based drilling fluid has a temperature resistance resisting a temperature of 220 °C or above
Data Source
Figure 1
AI summary
The present invention relates to the field of petrochemical drilling and discloses a drilling fluid additive composition. The composition contains rheological modifier, emulsifier and tackifier. Among them, the rheological modifier is dimer acid-organic amine copolymer comprising structural units from dimer acid, structural units from alkylamine and structural units from arylamine; the tackifier is modified polysiloxane nano-particles, and the modifying group Z on the polysiloxane nano-particles is the emulsifier is one or more of the compounds represented by the following Formula (1). The present invention further provides a high temperature resistant clay-free whole-oil-based drilling fluid containing the foregoing composition. Through synergistic effect of the rheological modifier, the emulsifier and the tackifier in the composition, the present invention obtains a clay-free whole-oil-based drilling fluid with desirable suspending power and temperature resistance.