| Citation: | DU Kun, LI Xiuling, WANG Benli, ZHAO Huaizhen, LI Qiong. Application of a Clay-Free Low Solids Water Based Drilling Fluid in Block Mi-38 in Changqing Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(3): 331-336. doi: 10.3969/j.issn.1001-5620.2021.03.011
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Horizontal drilling has long been used to develop the dense sandstone natural gas reservoirs in the Block 38 in Shenmu gas field (part of Changqing Oilfield) in the north of Shaanxi Province. The drilling fluid used to drill the upper formations had high solids content, which resulted in many problems in drilling the reservoir section, such as difficulties in exert pressure on the drill bit, high friction, borehole wall collapse and resistance to tripping into the hole. Based on the reservoir characteristics of the reservoirs in the Block Mi-38, a clay-free low solids drilling fluid was formulated with carefully selected key additives to address these problems. Laboratory experiment on this drilling fluid showed that this clay-free low solids drilling fluid has good plugging and inhibitive capacity; depth of fluid invasion at HTHP (3.5 MPa, 150℃) into a sand-bed was 7.2 cm, and the length of a shale core had an extension in length of only 0.76 mm after experiment for 16 hours. In field application, this drilling fluid showed good rheology, inhibitive capacity and plugging capacity, satisfying to some extent the needs of drilling the easy-to-collapse horizontal sections of wells drilled in the Block Mi-38 in Changqing Oilfield. Three wells drilled with this clay-free low solids drilling fluid showed low friction and no difficulties in exerting pressure on bit during drilling. Tripping of the drilling pipe into or out of hole was smooth and no downhole troubles have ever been encountered. The drilling time was 10.85 d less than the designed drilling time, casing string was run into the hole with no resistance. Compared with wells drilled nearby, the production rate of gas of a single well drilled with the clay-free low solids drilling fluid was significantly increased.
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