Advances in Earth Science ›› 2013, Vol. 28 ›› Issue (1): 79-85. doi: 10.11867/j.issn.1001-8166.2013.01.0079

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Aqueous Capillary Imbibition Behavior Management in Fractured Tight Gas Reservoirs

You Lijun, Kang Yili   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu610500, China
  • Received:2012-06-25 Revised:2012-11-15 Online:2013-01-10 Published:2013-01-10

You Lijun, Kang Yili. Aqueous Capillary Imbibition Behavior Management in Fractured Tight Gas Reservoirs[J]. Advances in Earth Science, 2013, 28(1): 79-85.

The filtration of drilling, completion and stimulation fluids, edge water and bottom water can spontaneously imbibe into and be blocked in the matrix adjacent to wellbore and fractures, which induces water phase trapping damage, preventing gas reservoir from identification, accurate assessment and economic development. The imbibition phenomena of tight sandstone gas reservoirs in west Sichuan basin and north Ordos basin during horizontal well drilling and completion, hydraulic fracturing and gas production operations are investigated on the basis of the production mechanisms of tight gas. The analysis of effects of well operation exerted by water phase imibibiton indicates that the water rapidly imbibes into matrix and displaces oil and gas, which breaks the chemical and mechanical balance and induces the borehole instability, that working fluids invading into fractures should return as soon as possible in case they imbibe into matrix and damage the fracture face, and that water proceeding along the fracture fast in fracture can be difficult to imbibe into matrix and induce waterflooding during gas production. The practices in oilfields fully prove that capillary imbibition management by optimizing water-based fluids and improving technical measures of gas production are and will be playing increasing role in preventing water phase trapping damage and economically developing fractured tight gas reservoirs.

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