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Study on Fine Flooding Adjustment at Block W in Chao-Chang Region, Daqing

Author: SunJun
Tutor: ShenXiaoHuaï¼›ShiLianJie
School: Zhejiang University
Course: Geology
Keywords: low permeability fine flooding adjustment fine reservoir description flood response pattern remaining oil distribution pattern
CLC: TE357.6
Type: Master's thesis
Year: 2011
Downloads: 104
Quote: 0
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Abstract


Block W, one of the typical blocks of developed fissured low permeability reservoirs in Chao-Chang region, which has come to the middle-high water-cut stage after primary well pattern adjustment. On the basis of fine reservoir geology research, through developing the fine flooding adjustment technology research of single sand body, could play demonstrative leading role and conduct and improve water flooding development level in Chao-Chang region.Firstly, fine reservoir description were accomplished by means of combination with wire-line logging and seismic data, distinguished boundary and trend of single sand body, deepen the cognition of fluvial sedimentary sand body. Secondly, there are 5 flood response patterns are classified by subdivided connected relations into 9 kinds pattern and analyzed superiority water flood direction. The main channel breakthrough pattern has only one strong flooding state along main channel sedimentary among various flood directions with greater difference degree. The main channel symmetrical pattern has two opposite strong flooding direction along main channel sedimentary among various flood directions. The balance pattern that the injection well connects to all the neighboring production well and injection water diffuse evenly. The asymmetrical pattern that the injection well connects to minority of the adjacent oil wells and connectedness relation belong to secondary or weak flooding state among various flooding directions. The fissure flood response pattern has obvious superiority flooding state along main fissure. Afterwards, according to the remaining oil quantification via reservoir numerical simulation for double media compose of matrix and fracture, meanwhile combine with flooding response patterns and dynamic water injection behavior,6 remaining oil patterns are classified. Those are injection-production faultiness, stagnation zone, inter-zone interference and horizontal interference, high flooded-out rhythm top and poor efficiency of water flooding. Among them inter-zone interference, horizontal interference and high flooded-out rhythm top remaining oil patterns, because of strong flooding state coexists with weak pattern, which own 43.1% of the total remaining reserves, is the primary flooding adjustment targets for present well pattern.Based on the above, in response to different flood response state and remaining oil distribution patterns, aiming at the single sand bodies,70 well times of fine flooding adjustment have been conducted in Block W in 2010 by way of conventional injection adjustment techniques including cyclic water flooding, zonal injection, fracturing, and etc. In order to improve the utilization of single sand body and consummate injection-production relation, the high water cut production well is converted into injection well. Direct at inter-zone and horizontal interference as a result of strong flooding state coexists with weak pattern, zonal injection and adjusting injection allocation rate and shallow profile control are made. Through cyclic water flooding, excavate high flooded-out rhythm top remaining oil of middle-high water cut oil well and horizontal interference remaining oil owing to the main channel response or fissure flood response. Regarding to well or oil layer locating in the edges of single river channel whose formation being bad and connected place of weak water flood state in composite meander belt, taking fracturing, acid stimulation and other measures to strengthen using remaining oil of poor efficiency of water flooding.After adjustment, development index of block W achieved production schedule. The percent of injection profile height keeps stabilized and slight improvement, the formation pressure restores further, and the horizontal pressure distribution turns to be reasonable, the water-cut increase rate and production decline rate are controlled effectively.

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Production Engineering > Enhanced oil recovery and maintain reservoir pressure (secondary and tertiary oil recovery ) > Reservoir water injection
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