Volume 33 Issue 6
Nov.  2016
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CHEN Fu, YANG Mei, AI Jiawei, LI Wei, LUO Taotao, CHEN Junbin. Treatment of CO2 Contamination to Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 58-62. doi: 10.3969/j.issn.1001-5620.2016.06.010
Citation: CHEN Fu, YANG Mei, AI Jiawei, LI Wei, LUO Taotao, CHEN Junbin. Treatment of CO2 Contamination to Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 58-62. doi: 10.3969/j.issn.1001-5620.2016.06.010
shu

Treatment of CO2 Contamination to Water Base Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2016.06.010

  • 1. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500;

  • 2. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chnegdu 610500;

  • 3. Drilling & Production Technology Research Institute of CCDC, Guanghan, Sichuan 618300

  • Received Date: 2016-09-09
  • Publish Date: 2016-11-30
    Abstract
  • Many technologies handling CO2 contamination to drilling fluids have shortages in practical use. This paper summarizes the defciencies of the methods commonly used, and presents advices for the treatment of CO2 contamination based on the mechanisms of contamination:drilling fluid should have moderate bentonite content, and Ca(OH)2 and CaCl2 should be used. High temperature saltresistant and highly adsorptive drilling fluid additives should be used, and old mud replaced with new one if necessary. Contamination of drilling fluids by CO2 has been encounteredin drilling the wells XX46-X1and XX008-6-X2. To cope with the CO2 contamination in drilling the well XX46-X1, centrifuges were used to control solids content and vacuum degassers used for continuous degassing of the drilling fluid at the surface. Mud density was increased to 2.0 g/cm3 to prevent CO2 gas cut. A proper amount of 0.2% Ca(OH)2, SMP-II, SMP-III, RSTF (high temperature salt-resistant flter loss reducer), HTX (high temperature thinner) and NaOH solution were usedto minimize the negative effects of CO2 on the properties of the drilling fluid. 0.5% CaCl2 solution was used when the CO2 gas cut became severe in late period. With these treatment, the viscosity and gel strengths of the drilling fluid were reduced, and the rheology and flter loss controlled, satisfying the needs of engineering and achieving the desired results.

     

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