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OilfieldTechnology
February
2014
originalmass indicates higher shale inhibitionperformance and
abetter performing inhibitor (Figure 6).
The three tests presented are only a subset of themany
performance tests designed tomeasure a shale inhibitor’s ability
tobind to active clays. Informationof this type guides both
the newproduct developer and the fluid formulation specialist
todevelop additives and fluids thatminimise the shale/fluid
interactions to insure a successful drilling, completionor
stimulationoperation takes place.
Lookingtothefuture
Over the coming years as new shale fields continue tobe
explored globally, the industrywill continually be faced
withmyriads of new shale types, shale stratigraphies and
mineralogical compositions indrilling, completion and
stimulationoperations. In addition, as environmental
Figure6.
Shaleretentioncomparisonfor6%KCl,3%polyetheramine,
3%cholinechlorideand3%novelshale inhibitor.
Figure4.
CSTtimecomparisonofnovelshale inhibitor,polyetheramine,
6%KCl,andcholinechloride.
Figure5.
Viscosityvsshearratecomparisonfor3%KCl,3%
polyetheramine,3%cholinechlorideand3%novel inhibitor.
regulations continue to tighten globally, an increase in the
environmental compatibility of the shale/clay inhibitorswill
be required. The challenges inmeeting theperformance
and environmental criteriawill drive the next generationof
engineers and scientists todevelopnewperformance testing and
formation evaluationmethods for thedevelopment of fluids to
successfully increase theproductionof oil and gas globally from
new shaleplays.
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