PETE 348 Lab No. 8 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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Unformatted text preview: UNIVERSITY OF LOUISIANA-LAFAYETTE Department of Petroleum Engineering TREATMENT OF CEMENT CONTAMINATED DRILLING FLUID Experiment No. 8 PETE 384, Drilling Fluids Laboratory Section 001 Date performed: 3/8/2005 Date submitted: 3/15/2005 Submitted to: Dr. Ali Ghalambor Submitted by: ____________________________ Team Members: J TABLE OF CONTENTS I. Abstract 3 II. Introduction 4 III. Apparatus & Procedure 6 IV. Graphs 7 V. Discussion 11 VI. Conclusions 12 VII. Recommendations 13 VIII. Appendix 13 IX. References 14 I. Abstract 2 The purpose of this experiment was to determine how treatment with Quebracho, SAPP, Sodium Bicarbonate, and a mixture of Quebracho and Soda Ash, can benefit a water-based bentonite drilling fluid, both before cement contamination (to maintain desired properties) and after contamination occurs (to return the mud to the desired properties). The areas of focus of this study involve parameters yielding data such as: a) plastic viscosity (cp) b) yield point (lb/100 ft 2 ) c) apparent viscosity (cp) d) 10 sec. spurt loss (mL) e) 2 min. fluid loss (mL) f) 5 min. fluid loss (mL) g) 7.5 min. fluid loss (mL) h) 10 sec. gel strength (lb/100 ft 2 ) i) 10 min. gel strength (lb/100 ft 2 ) Results from the data gathering are listed in Table 1 . This experiment also seeks to answer the following questions: a) Give the principal characteristics of cement contamination. b) What two ions are measured in total hardness? c) How could you tell if salt was being picked up from the stringers or from salt- water flow? d) Why does continued treatment with soda ash for anhydrite of gypsum sometimes cease to be effective? Why so when treating for cement contamination? e) How would you stop a salt-water flow? What is the danger involved here? f) What is the maximum salt concentration at which you can control fluid loss? How is the point related to the viscosity contamination curve? g) Give three reasons for pre-treating for cement. II. Introduction 3 During the normal operations of drilling, the drilling fluid is used to carry cuttings to the surface. During this process, the fluid is exposed to minerals and clay compounds found in certain sections of the drilling fluid circulatory system. The source of these minerals is initially the bit-open hole interface and subsequently the well bore walls of the open hole. As the process of drilling brings the drilling fluid into contact with new formations, the drilling fluid may take on different characteristics from a reaction with the encountered stratagraphic layer. This fluid-formation material contact may cause the drilling fluid properties to change. Changes in the properties of the mud can affect its performance as it travels through the open hole and the cased sections of the well bore....
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PETE 348 Lab No. 8 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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