PETE 348 Lab No. 7 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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UNIVERSITY OF LOUISIANA-LAFAYETTE Department of Petroleum Engineering EFFECT OF CONTAMINANTS AND CHEMICAL TREATMENTS ON A LOW-SOLIDS MUD SYSTEM Experiment No. 7 (7.1 to 7.3) PETE 384, Drilling Fluids Laboratory Section 001 Date performed: 3/1/2005 Date submitted: 3/8/2005 Submitted to: Dr. Ali Ghalambor Submitted by: ____________________________ Team Members: TABLE OF CONTENTS
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I. Abstract 3 II. Introduction 5 III. 7 IV. Graphs 8 V. Discussion 17 VI. Conclusions 19 VII. Recommendations 21 VIII. Appendix 22 IX. References 22 I. Abstract 2
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The purpose of this experiment was two fold. First, this experiment seeks to determine the changes in mud properties that occur when contaminants enter the mud system. Second, how treatment, through the use of certain chemicals, can benefit the mud, both before (to maintain desired properties) and after (to return the mud to the desired properties) contamination occurs. The experiment was conducted on a water- based bentonite drilling fluid using contaminants in the form of cement, gypsum, and two concentrations of salt. The areas of focus of this study involve parameters yielding data such as fluid weight, plastic viscosity, apparent viscosity, yield value, and hydrogen ion concentration (pH). Fluid loss characteristics were also studied using an API filter press assembly. Results from the data gathering are listed in Tables 1 to 3 . Table 1 : Brief of data obtained from Part I of the experiment. Base Base + Cement Cement + SAPP Cement + Na(CO 3 ) 2 SAPP + Cement Na(CO 3 ) 2 + Cement Mud Weight 8.5 8.7 8.7 8.7 8.6 8.7 600 RPM 17 24 18 15 15 21 300 RPM 9 15 10 8 7 13 PV 8 9 8 7 8 8 YP 1 6 2 1 0.1 5 10 Second 0 6 0 0 0 7 10 Minute 4 36 3 1 1 18 Spurt Loss 2.9 4 5 3.8 2 4 7.5 min Loss 8.3 9.8 9.8 8 7.5 8.2 pH 8 10.5 7.1 5.9 9.1 9.1 Table 2 : Brief of data obtained from Part II of the experiment. 3
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Base Base + Gypsum Gypsum + Quebracho Quebracho + Gypsum Mud Weight 8.6 8.7 8.6 8.6 600 RPM 14 26 36 46 300 RPM 9 19 28 42 PV 8 7 8 4 YP 1 12 20 38 10 Second 0 6 10 16 10 Minute 4 9 14 25 Spurt Loss 2.9 4 5 4.5 7.5 min Loss 8.3 11.5 14.5 13 pH 8 7.7 6.5 6.4 Table 3 : Brief of data obtained from Part III of the experiment. Base 2000ppm NaCl 2000ppm NaCl + lignite 20,000ppm NaCl 20,000ppm NaCl + lignite Mud Weight 8.6 8.5 8.3 8.7 8 600 RPM 17 17 22 19.5 25 300 RPM 9 11 15 14 18 PV 8 6 7 5.5 7 YP 7 5 8 8.5 11 10 Second 0 6 6 8 8 10 Minute 4 10 8 12 9 Spurt Loss 2.9 3.7 3.5 4.2 3.9 7.5 min Loss 8.3 8.3 8 8.8 7 pH 8 8 6.2 7.7 5.9 II. Introduction 4
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During the normal operations of drilling, the drilling fluid used to carry cuttings to the surface is exposed to minerals and clay compounds. 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
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PETE 348 Lab No. 7 - UNIVERSITY OF LOUISIANA-LAFAYETTE...

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