砂岩油藏特高含水期的水驱特征

doi:10.12108/yxyqc.20210516

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 163-171.doi: 10.12108/yxyqc.20210516

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles Next Articles

Water displacement rules of sandstone reservoirs at extra-high water-cut stage

LI Chuanliang^1,2, WANG Fenglan², DU Qinglong², YOU Chunmei², SHAN Gaojun², LI Binhui², ZHU Suyang¹

1. School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610599, China;
2. Research Institute of Exploration & Development, PetroChina Daqing Oilfield Company Limited, Daqing 163712, Heilongjiang, China

Received:2020-12-25 Revised:2021-02-18 Online:2021-10-01 Published:2021-09-30

Abstract

Abstract: Water-flooded sandstone reservoirs showed quite different production characteristics and water displacement rules at the extra-high water-cut stage from the high water-cut stage. The theoretical models of reservoirs at high water-cut stage cannot be applied to the production practice of reservoirs at the extra-high water-cut stage. In order to manage the reservoir production at the extra-high water-cut stage properly, a study was carried out based on the production data of reservoir DT to find out the water displacement rules and displacement mechanism. There are some conclusions as following. The reservoirs at extra-high water-cut stage showed the main aspects of "one high and two lows", i.e. high water-cut, low production rate and low recovery factor. The decline ratio of production rate and the rising rate of water-cut are also quite low. There is tremendous remaining oil underground being worth recovering. Reservoir oil is displaced through two basic mechanisms, one is water-driving recovery and the other is water-flooding recovery. The continuous oil is produced by water-driving recovery with high efficiency, and the discrete oil is produced by water-flooding recovery with low efficiency. At the early stage of development, reservoirs are produced mainly through water-driving recovery, while in the late stage mainly through water-flooding recovery which is converted from the water-driving recovery in the early stage. The water drive curve and the water-oil ratio curve are approximate straight lines at high water-cut stage. However, the lines are up warding at extra-high water-cut stage from high water-cut stage, which means that the recovery mechanism is converting from the water-driving to the water-flooding with the recovery efficiency changing worse. The efficiency of oil recovery predicted by the displacement rules of high water-cut stage is higher than that predicted by the displacement rules of extra-high water-cut stage, for example it is 5.24 percent points for reservoir DT. The recovery efficiency enhancement of reservoirs is always realized through the enhancement of recovery factor, which includes three measures of expanding water-sweep, deepening water-flooding and increasing displacement efficiency. Long term water flooding can also enhance the reservoir recovery factor. Reservoir development at extra-high water-cut stage should be focused on the increasing of sweep factor, meanwhile the displacement efficiency of oil will be increased simultaneously during development of reservoirs.

Key words: sandstone reservoir, water drive, water flood, water-cut, extra-high water-cut, efficiency of recovery, water-oil ratio, water drive curve, sweep factor

CLC Number:

TE341

LI Chuanliang, WANG Fenglan, DU Qinglong, YOU Chunmei, SHAN Gaojun, LI Binhui, ZHU Suyang. Water displacement rules of sandstone reservoirs at extra-high water-cut stage[J].Lithologic Reservoirs, 2021, 33(5): 163-171.

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Water displacement rules of sandstone reservoirs at extra-high water-cut stage

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