Flat Rheology Invert Emulsion Fluids for Clean Wellbores
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Solution Overview
Problem
Traditional flat rheology wellbore fluids require excessive rig time for conditioning before cement and liner operations, compromising drilling rates and achieving successful isolation of overburden formations, and do not efficiently prepare wellbores for cement jobs without lengthy and costly dilution processes.
Innovation Solution
The development of flat rheology invert emulsion wellbore fluids with an amidoamine emulsifier and a combination of wetting agents and rheology modifiers, which maintain consistent rheological properties across temperature and pressure ranges, reducing conditioning time and volume by enhancing cuttings transport and suspension capabilities, thus preparing wellbores for cement jobs with minimal treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional flat rheology wellbore fluids are used, then drilling operations can be performed, but excessive rig time is required for conditioning before cement and liner operations
Solution Approach 1:
The patent modifies the rheological parameters of the wellbore fluid by incorporating specific additives (polymer, surfactant, viscosifier) that enable the fluid to maintain flat rheology across a broader temperature range. This parameter change allows the fluid to achieve both efficient cuttings transport during drilling and readiness for cement operations without excessive conditioning time, resolving the contradiction between drilling rate and conditioning time.
Solution Approach 2:
The wellbore fluid is formulated in advance with specific rheology-modifying additives that pre-condition the fluid to maintain optimal properties throughout the drilling operation. This preliminary formulation ensures the fluid is ready for cement operations with minimal additional conditioning, eliminating the need to compromise drilling rates to achieve proper fluid conditioning.
2Ease of manufacture
If traditional flat rheology wellbore fluids are used, then drilling operations can be performed, but lengthy and costly dilution processes are required to prepare wellbores for cement jobs
Solution Approach 1:
The patent changes the chemical composition parameters of the wellbore fluid by incorporating rheology-modifying additives that enable the fluid to maintain stable rheological properties without requiring dilution. This parameter modification allows the fluid to be directly ready for cement operations, eliminating lengthy and costly dilution processes while reducing conditioning time.
3Productivity
If flat rheology is maintained across temperature ranges, then hole cleaning and weight material suspension are improved, but frictional pressure losses may increase
Solution Approach 1:
The patent optimizes the rheological parameters of the fluid by using specific polymer and surfactant combinations that provide flat rheology across temperature ranges while controlling viscosity. This parameter optimization maintains improved hole cleaning and weight material suspension without excessive frictional pressure losses, as the additives are selected to balance rheological performance with energy efficiency.
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
These fluids significantly reduce conditioning time and volume by maintaining flat rheology profiles, improving hole cleaning and penetration rates, and ensuring wellbore integrity for successful cement and liner operations, minimizing loss circulation events and rig days.
Implementation Method 1
an emulsifying agent may be used to lower the interfacial tension of the liquids so that the non-oleaginous liquid may form a stable dispersion of fine droplets in the oleaginous liquid
Implementation Method 2
Emulsifying agents may be used to lower the interfacial tension of the liquids
Implementation Method 3
flat rheology invert emulsion fluids containing an amidoamine emulsifier and a combination of wetting agents and/or rheology modifiers which maintain consistent rheological properties across temperature and pressure ranges
Implementation Method 4
to control subsurface pressures, to maintain the integrity of the wellbore until the well section is cased and cemented, to isolate the fluids from the formation by providing sufficient hydrostatic pressure
Data Source
AI summary
A method of drilling a wellbore may include drilling the wellbore using a wellbore fluid that has rheological property values for 6 rpm, 10 minute gel, Yield Point, and/or 10 minute-to-10 second gel ratio that are +/20% of the mean values across a temperature range from 40° F. to 300° F.; and conditioning the wellbore with less than 2 hole volumes. The wellbore fluid may include an oleaginous external phase; a non-oleaginous internal phase; an amidoamine emulsifier stabilizing the non-oleaginous internal phase within the oleaginous external phase; at least two oil wetting agents; a rheology modifier; and a weighting agent having a d50 ranging from 5 to 10 μm.