PETE 348 Lab No. 11 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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UNIVERSITY OF LOUISIANA-LAFAYETTE Department of Petroleum Engineering GYPSUM DRILLING FLUIDS – ALKALINITY DETERMINATION Experiment No. 11 PETE 384, Drilling Fluids Laboratory Section 001 Date performed: 4/5/2005 Date submitted: 4/25/2005 LATE Submitted to: Dr. Ali Ghalambor Submitted by: ____________________________ aier Team Members: Ja
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2 TABLE OF CONTENTS I. Abstract 3 II. Introduction 4 III. 5 IV. Discussion 6 V. Conclusions 7 VI. Data 8 VII. References 9 I. Abstract
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3 During drilling operations, certain formations are known to significantly change the rheological properties of a drilling fluid. This experiment studies the effects of a water based bentonite fluid pretreated with dry gypsum (calcium sulfate) and salt sodium chloride) exposed to simulated formation contaminants such as diesel oil. The effects of the gyp and salt as well as the diesel contaminant on the drilling fluid can be limited through the use of these inhibitive techniques before the formations are reached. This type of mud is “inhibitive”, which is defined as mud that slows or stops hydration, swelling and disintegration of shales. [1] The test examined the fluid properties of the inhibited mud. The viscosity of the base Gyp mud did not vary significantly from the base mud while exhibiting lower filtrate losses as expected. However, weighing up the Gyp mud with barite after addition of 5% volume oil produced higher viscosities and gel strengths, as well as a noted increase in the filtrate fluid loss. The results from the experiment can be seen in . II. Introduction
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4 During the drilling process, it is necessary to keep the properties of the drilling fluid at the desired levels. Plastic viscosity, apparent viscosity and yield value are properties that should be closely monitored during this process as well as during the fluid building phase. These three measurements provide an insight to the surface pump pressures and
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PETE 348 Lab No. 11 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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