Experimental Investigation into a Novel Supersaturated Saline Drilling Fluid Available in Anhydrite Formation: A Case st
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RESEARCH ARTICLE-PETROLEUM ENGINEERING
Experimental Investigation into a Novel Supersaturated Saline Drilling Fluid Available in Anhydrite Formation: A Case study of Missan Oilfields, Iraq Lin Xu1
· Xin Huang2 · Fu-chang You3,4 · Jie Xu5 · Ming-biao Xu3 · Jun Gao6 · Mei-lan Huang7
Received: 8 April 2020 / Accepted: 20 August 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The supersaturated saline drilling fluid (SDF) with strong inhibition, as a novel alternative to anhydrite formation drilling, is crucial for the safe and economic drilling operation. In this work, a high performance supersaturated SDF was experimentally formulated in terms of the long anhydrite features of Missan Oilfields. Composite weighting approach involving liquid and solid materials was introduced to reinforce the inhibition of supersaturated SDF. A suite of laboratory tests was conducted to screen the essential viscosifiers and filtrate reducers, and optimize the formula of supersaturated SDF, by means of evaluating the basic rheological and filtration properties. The results showed that univalent salts, NaCl, KCl, and HCOONa, are utilized to formulate the multiple brine phase, and polymeric additives, VIS and S-FLO, can effectively improve rheology and filtration properties. The newly developed supersaturated SDF exhibits the excellent thermal stability, lubricity, as well as inhibition capability, which should be an instructive solution to minimize the hole problems in the anhydrite drilling. Keywords Anhydrite formation · Supersaturated brine · Weighted drilling fluid · High performance
1 Introduction Drilling through anhydrite formations is always challenging, due to the plastic deformation and cramping property Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13369-020-04911-x) contains supplementary material, which is available to authorized users.
B
Ming-biao Xu [email protected]
1
College of Petrochemical and Energetic Engineering, Zhejiang Ocean University, Zhoushan 316022, China
2
Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
3
Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China
4
Jiahua Technology Co., Ltd, Jingzhou 434000, China
5
Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
6
CNOOC (China) Co., Ltd, Shanghai Branch, Shanghai 315000, China
7
School of Chemistry and Chemical Engineering, Queen’s University Belfast, Belfast BT95AG, UK
of anhydrite, which can cause various drilling problems such as drilling fluid contamination, hole shrinkage, hole washout, hole collapse, and pipe sticking [1, 2]. It has been established in the last decade that drilling operation of anhydrite can be significantly improved by saltwater drilling fluids. Salts can dissolve in water necessitating the salinity of based fluid be kept near or at saturation to minimize wellbore
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