Experimental study of low-damage drilling fluid to minimize waterblocking of low-permeability gas reservoirs |
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Authors: | Zhang Hongxi Yan Jienian Lu Yu Shu Yong and Zhao Shengying |
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Affiliation: | 1. Key Laboratory of Petroleum Engineering,Ministry of Education,China University of Petroleum,Beijing 102249,China 2. Drilling Fluid Branch,Great Wall Drilling Company,PetroChina,Panjin,Liaoning 124010,China |
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Abstract: | This paper discusses the systematic design and development of low-damage drilling fluid to protect the low-permeability gas
reservoir of the Sulige block in the Ordos Basin, Inner Mongolia Autonomous Region, China. Based on investigation of the geological
characteristics and the potential formation damage of the Permian formation of the reservoir, waterblocking due to invasion
of drilling or completion fluids was identified one of the most severe causes of damage to gas well deliverability. By adopting
the phase trap prevention method, ideal packing theory, and film-forming technology, a low-damage drilling fluid, sodium formate
brine containing efficient waterblocking preventing surfactants, optimized temporary bridging agents (TBAs), and film-forming
agents has been developed. The performance of the new drilling fluid was evaluated by using a variety of techniques. The results
show that the fluid has good rheological properties, good strong shale-swelling inhibition, good temporary plugging effect,
ultra-low filtration, and good lubricity. It can efficiently minimize waterblocking and can be used to drill horizontal wells
with minimal intervention of the reservoir in the Sulige Gas Field. |
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Keywords: | Low-permeability gas reservoir waterblocking ideal packing theory (IPT) film-forming agent drilling fluid |
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