Oil Layer Identification by NMR with the Use of Oil-Based Drilling Fluid

doi:10.11938/cjmr20150309

Abstract

Abstract:

Oil-based drilling fluids show advantages such as high shale inhibition and good lubrication, and are beneficial for borehole stability and protecting the oil layers in unconventional horizontal and deep wells. However, oil-based drilling fluids often have strong fluorescent signals and high total hydrocarbon ratio, such that it is difficult to wash the rock debris clean when these fluids are used, resulting in contamination of oil in the layer and making identification and evaluation of oil layers problematic. In this work, high-resolution low-field NMR while drilling was used to monitor the oil content in drilling fluids. The results showed that oil-based drilling fluids had different NMR characteristics from mixed drilling fluids. The latter is an oil-in-water system, such that the new peaks would arise in the T₂ spectrum when drilling into oil layer. The former is a water-in-oil system, and no new peaks would arise in the T₂ spectrum when drilling into the oil layer. Under such circumstance, however, heavy oil could be identified via oil characterization, and middle and light oil could be determined by analyzing oil content in the oil layer. This method proposed was applied in Well S903H with complex geology and the use of oil-based drilling fluid. It was proved that drilling fluid NMR technique an effective method for identifying oil layers.

Key words: oil-based drilling fluid, oil layer, oil content, oil characterization, NMR

CLC Number:

O482.53

WANG Zhi-zhan1*，WEI Yang-xu2，QIN Li-ming1，ZHENG Yi-ting1，ZHAO Ming3，XIANG Shu-ping3，HUI Cheng-feng4. Oil Layer Identification by NMR with the Use of Oil-Based Drilling Fluid[J]. Chinese Journal of Magnetic Resonance, 2015, 32(3): 481-488.

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