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Apparatus and Method To Test Drilling Fluid Stability “ Sag Tester ™ ”. Associate Prof. Shteryo Lyomov, Ph.D. Mining and Geology University Department Of Drilling and Oil and Gas Production 1700 Sofia BULGARIA. Project Background.

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apparatus and method to test drilling fluid stability sag tester

Apparatus and Method To Test Drilling Fluid Stability“Sag Tester™”

Associate Prof. Shteryo Lyomov, Ph.D.

Mining and Geology University

Department Of Drilling and Oil and Gas Production

1700 Sofia

BULGARIA

project background
Project Background
  • Field problems associated with drilling mud stability leading to barite sagging/hole cleaning still exist.
  • Lack of relevant/suitable equipment for direct testing of drilling mud stability at the rig site and laboratories with respect to stability (barite sagging).
  • Gained experience in barite sag investigation.
project goals
Project Goals
  • Pre – project.
    • Development of equipment - hardware and software;
    • Tuning the equipment (sensitivity, accuracy, reliability and software debugging)at lab conditions and setting of initial criteria for drilling mud evaluation.

Project.

    • Development and production of industrial Sag Tester™;
    • Conducting of training seminars for the sponsors;
    • Field testing and implementation;
      • Field debugging of the firmware and software;
      • Verify mechanical/software reliability;
      • Determining best operation practice;
    • Commercial promotion.
description
Description
  • The barite Sag Tester™ uses pressure measurements in order to evaluate drilling mud stability.
  • The main idea is based on the Boycott effect and is a further development of the work published by P. Skalle, K. R. Backe, S. K. Lyomov et. al.*

*P. Skalle, K.R. Backe, S.K. Lyomov et. al. “Barite Segregation in Inclined Boreholes” JCPT, special Vol. I, paper 97-76.

description continued
Description, (continued)

Barite Sag Tester™*

Components.

  • V – pipe;
  • Z – pipe;
  • – well bore inclination;
  • Bypass valve;
  • Pressure sensors;
  • Temperature sensor;
  • D/A and control system.

* Patent Pending Reg. No. 107573/BGR patent office.

description continued1
Description, (continued)

Drilling mud is poured into the barite Sag Tester™, while the valve is opened. This assures equal height of the mud columns in the V - pipe and Z - pipe. Then the valve is closed, pressure and temperature measurements are taken in an interval of sec/min for a period of 5 - 6 h.

The difference between the pressures measured in the bottom of V - pipe and Z-pipe after a ? h time interval is a direct indication for drilling mud stability.

The results from a testing two drilling mud are shown on the next 2 slides.

mud stability evaluation criteria
Mud Stability Evaluation Criteria
  • Pressure reduction in the V – pipe dP1;
  • Pressure reduction in the Z – pipe, dPz2;
  • Bottom hole T and P;
  • Borehole inclination – .
sag tester features
Sag Tester™ Features
  • Simple principle of measurement;
  • Quartz pressure sensors with high accuracy;
  • Temperature measurement;
  • PC based D/A and control system allows real time measurement of the drilling mud behavior;
  • The Sag Soft™ software accounts for the influence of the borehole P, T as well as inclination – ;
  • Simple to use at laboratory and at the rig site.
competitive analysis
Competitive Analysis
  • Competitors.
    • sag index, sag number and sag register;
    • software (HYDRAUL™, MUDMAN™);
    • controlled stress and low shear rate/gel measurements.
  • Strengths.
    • Equipment/software exists on the market.
  • Limitations.
    • track the barite sag, not predict (sag index/register), impractical to use (sag number) ;
    • not direct measurements;
    • flow conditions in wellbore differ from these in the viscometer.
competitive analysis continued
Competitive Analysis, (continued)

Sag Tester™.

  • Strengths.
    • Uses simple principle;
    • Direct measurement of the mud parameter related to the barite sagging - density/pressure;
    • Easy to operate and analyze - PC/Sag Soft™ software.
  • Limitations.
    • New unknown equipment;
    • Lack of field experience/data;
    • Needs market promotion.
jip team resources
JIP Team/Resources
  • Team working on the project.
    • Project leader – Ass. Prof. Sht. Lyomov, Ph.D.
    • Experimental work leader- Ass. Prof. L. Gerov, Ph.D.
    • Design work leader - Prof. N. Nenkov, Ph.D.
    • Electronics - Rhoe BG electronics Ltd.
    • Manufacturing - University workshop, ZMM - Sofia.
jip team resources continued
JIP Team/Resources, (continued)
  • Project resources.
    • Pre - project 64,000 $ (4 participants 16 000 $ each)
    • Project 175,000 $ (5 participants 35 000 $ each)
  • Location.

Mining and Geology University,

Department Of Drilling and Oil & Gas Production,

1700 Sofia, BULGARIA.

schedule
Schedule
  • Pre - project 12 months.

Design 2 months

Building the Sag Tester set up 3 months

Laboratory testing 7 months

  • Project 12 months.

Design/production industrial prototype 2 months

Testing of industrial prototype 9 months

Field implementation and testing 9 months

Data analysis and final reporting 6 months

expected results
Expected Results
  • Development of apparatus and method to test drilling mud stability with respect to barite sag – The Sag Tester™.
  • Set and field prove of criteria for drilling mud evaluation.
  • Development of software Sag Soft™ to predict mud behavior based on measurement with the Sag Tester™.
  • Market promotion of new equipmentand technology, that reduces lost time for mud conditioning/circulation and extra expenses.