Research and Application of Micronized Barite Drilling Fluid in HPHT Wells of the Western South China Sea
International Journal of Oil, Gas and Coal Engineering
Volume 4, Issue 2, March 2016, Pages: 9-15
Received: Feb. 26, 2016; Accepted: Mar. 6, 2016; Published: Mar. 19, 2016
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Authors
Han Cheng, CNOOC Ltd. _Zhanjiang, Zhanjiang, Guangdong, China
Zhang Chao, CNOOC Ltd. _Zhanjiang, Zhanjiang, Guangdong, China
Luo Ming, CNOOC Ltd. _Zhanjiang, Zhanjiang, Guangdong, China
Wei Anchao, CNOOC Ltd. _Zhanjiang, Zhanjiang, Guangdong, China
Xu Fabin, CNOOC Ltd. _Zhanjiang, Zhanjiang, Guangdong, China
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Abstract
When drilling wells in high temperature and high pressure (HTHP) fields, the drilling fluid properties are of utmost importance. If the viscosity of high density drilling fluid is too low, it will lead to barite sag and poor cuttings carrying capacity. However, lost circulation will occur due to high surge pressure and Equivalent Circulating Density (ECD) caused by high viscosity. High density drilling fluid performance is largely dependent on the use of the weighting material. The contradiction between rheological properties and barite sag of API Barite High Density Drilling Fluid (HABF) is great in the condition of HTHP. This article describes a novel weighting material that has resulted in a ten-fold reduction in the particle size of API barite. With this micronized barite, the contradiction of high density drilling fluid can be solved. The rheology, sag stability and lubricity of high density drilling fluid weighted by micronized barite and API barite is investigated in the laboratory. And the mechanism of micronized barite to improve the performance of high density drilling fluid is discussed by using size distribution, surface charge, and microscopic shape method. Micronized Barite High Density Drilling fluid (HMBF) was first applied in two HTHP exploration wells with good gas show recently, which are in Western South China Sea. HMBF exhibited good rheological properties, sag stability and lubricity in the drilling process. Drilling task was successfully completed, without complicated situation.
Keywords
High Temperature and High Pressure, Micronized Barite, High-Density Drilling Fluid, Barite Sag, Weighting Material
To cite this article
Han Cheng, Zhang Chao, Luo Ming, Wei Anchao, Xu Fabin, Research and Application of Micronized Barite Drilling Fluid in HPHT Wells of the Western South China Sea, International Journal of Oil, Gas and Coal Engineering. Vol. 4, No. 2, 2016, pp. 9-15. doi: 10.11648/j.ogce.20160402.11
Copyright
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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