Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (4): 115-119.doi: 10.3969/j.issn.1673-8926.2009.04.024

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The analysis on the sources of water body and characteristic of water breakthough at Block 12 in Tahe Oilfield

QI Minghui1，LU Zhengyuan1，YUAN Shuai2，LI Xinhua3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration， Chengdu University of Technology， Chengdu 610059，China； 2. College of Oil and Gas Engineering， China University of Petroleum， Beijing 610059， China； 3. Research Institute of Exploration and Development， Northwest Company， Sinopec， Urumuqi 830011， China
  • Online:2009-12-16 Published:2009-12-16

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Abstract:

The heterogeneity of the reservoir of Ordovician systemin Tahe Oilfield is serious, and the water-oil relation is complex, water breakthrough in the oil well is the main reason that causes production drawdown. The sources of the water body in the water breakthrough well include the leakage fluid and the acid fracturing fluid remained, relic water in the bottom of the fracture-cave unit. The water body in the lower part of the fracture-cave unit is connected by acid fracturing. The output of the leakage fluid always presents the pattern of water cut decline which has low influence on the production. The output of the relic water and the water body in the lower part are different because of the energy of the water body, the height of the oil-water contact and the difference of the vertical permeability. It is a effective way to enhance the ultimate degree of reserve recovery in the reservoir that take steps to stabilize oil production and control water cut of the different resources of the water body and different characteristics of water breakthough.

Key words: Hilbert-Huang transform, empirical mode decomposition, array acoustic wave, time-frequency analysis

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