Volume 35 Issue 1
Jan.  2018
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LI Xuan, HUANG Weian, JIA Jianghong, WANG Youwei, LI Yunping, WANG Jingwen. Study on Factors Affecting pH Value of Saltwater Drilling Fluids and Methods of Buffering pH Value[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 21-26. doi: 10.3969/j.issn.1001-5620.2018.01.004
Citation: LI Xuan, HUANG Weian, JIA Jianghong, WANG Youwei, LI Yunping, WANG Jingwen. Study on Factors Affecting pH Value of Saltwater Drilling Fluids and Methods of Buffering pH Value[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 21-26. doi: 10.3969/j.issn.1001-5620.2018.01.004

Study on Factors Affecting pH Value of Saltwater Drilling Fluids and Methods of Buffering pH Value

doi: 10.3969/j.issn.1001-5620.2018.01.004
  • Received Date: 2017-10-15
  • Publish Date: 2018-01-30
  • In deep well drilling, the pH value of saltwater drilling fluids decreases quickly and is difficult to control when drilling salt/gypsum formations, salt/gypsum/shale formations and formations with high-pressure salt water. In laboratory experiments, salts, surfactants and amines were investigated for their effects on adjusting and controlling the pH value of saturated saltwater drilling fluids before and after aging. It was understood from the experiments that salts formed by strong bases and weak acids, anionic surfactants, nonionic surfactants, the compounded products of anionic surfactant and nonionic surfactant, and amines all to some extents were able to buffer the pH value of saturated drilling fluids before and after aging. Studies on the effects of mud salinity, commonly used saltwater additives such as sulfonates on pH showed that an increase in the salinity led to quick decrease in the pH value of bentonite base mud. Polymer additives obviously affected the pH value of saturated drilling fluids. Sulfonated additives, on the other hand, was more or less able to buffer the pH value of a mud. A surfactant compound composing 0.3% WJG and 0.1% SDBS has been presented as a new way of pH buffering. This surfactant compound is able to effectively buffer the pH values of seawater drilling fluid, high density saturated drilling fluid and high density organic salt drilling fluid.

     

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