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Low-Toxicity Polymer Fluid Developed for Environmentally Sensitive Offshore Drilling

This paper discusses a new, environmentally safe, water-based polymer drilling fluid that has been developed for offshore drilling applications with temperature resistance to 200°C and low biological toxicity. The system comprises two basic polymeric components for high-temperature rheology and filtration control, along with a special nanoplugging agent, glycol shale inhibitor, extreme-pressure lubricant, and barite or formate weight material. The base slurry is light-colored and nontoxic to the marine environment, and so can be discharged directly into the sea. Results from field testing in a Bohai offshore oil field are presented in the complete paper.

Introduction

Historically, significant limitations have been placed on the use of drilling fluids in high-temperature operations in environmentally sensitive areas of China. Oil-based drilling fluid is restricted in use by laws and regulations; polysulfonated, water-based drilling fluid and waste liquid are on the national hazardous waste list; and polymer drilling fluid such as XC/CMC/PAC/PHPA can only be used in temperatures lower than 150°C. Additionally, the offshore drilling-fluid discharge requires a low biological toxicity value. These harsh operation conditions and strict environmental laws and regulations pose severe challenges for high-pressure/high-temperature water-based drilling-fluid-formula design and field construction.

This article, written by JPT Technology Editor Judy Feder, contains highlights of paper SPE/IADC 190967, “Development of Low-Toxicity and High-Temperature Polymer Drilling Fluid for Environmentally Sensitive Offshore Drilling,” by Xiaodong Liu, CNPC; Binqiang Xie, Yangtze University; Yonghui Gao, Huiling Gu, Yongle Ma, and Yong Zhang, CNPC; Ruxin Zhang, China University of Petroleum-Beijing; and Qingyang Li, Southwest Petroleum University, prepared for the 2018 IADC/SPE Asia Pacific Drilling Technology Conference, 27–29 August, Bangkok, Thailand. The paper has not been peer reviewed.
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Low-Toxicity Polymer Fluid Developed for Environmentally Sensitive Offshore Drilling

01 November 2019

Volume: 71 | Issue: 11

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