Reasonable Water-injecting Development Methods of Multiple-fracturing Horizontal Well in Ultra-Low Permeability Glutenite Reservoir

doi:10.19657/j.geoscience.1000-8527.2018.01.20

Abstract

Abstract:

At the ultra-low permeability glutenite reservoir conditions, when elastic development is used for the long well section fractured horizontal well, the productivity reduces rapidly as the formation energy reducing and the cost of development can’t withdraw. Using the multiphase seepage theory and reservoir numerical simulation method, and taking the example of the Yan 227 block in ultra-low permeability glutenite reservoir of Yanjia area, the reservoir numeric model is built up according to the actual data. The paper makes a feasibility research on water injection development in glutenite reservoir of Yanjia area. In the meanwhile, based on flowing mechanism and production law, the paper studies on the reasonability of normal water injection development,advanced water injection development and water injection & production development. Then the effective development methods is presented about the horizontal well in ultra-low permeability reservoir. The result shows that: the water rate of water injection & production is 25% lower than normal water-injection development and advanced water injection can improve about 30% production more than normal elastic development at the early period. So these two new development ways are useful to controlling the water logging problem and improving the recovery degree.

Key words: ultra-low permeability reservoir, multiple-fracturing horizontal well, water-injection development, water injection &, production, advanced water-injection

CLC Number:

TE243
TE348

CUI Chuanzhi, CHEN Honglin, GUO Yingchun, WANG Qian, ZHANG Shufan. Reasonable Water-injecting Development Methods of Multiple-fracturing Horizontal Well in Ultra-Low Permeability Glutenite Reservoir[J]. Geoscience, 2018, 32(01): 198-204.

Figures/Tables 16

Fig. 1 Injection & production geological model of row horizontal well pattern

Fig.2 Well hole pressure and pressure derivative of multistage fracturing horizontal well with water injection development(penetration ratio:0.35)

Fig.3 Double linear flow of fracture period

Fig.4 Transient radial flow of fracture period

Fig.5 Transient linear flow period

Fig.6 Quasi-steady flow under control of boundary period

Fig.7 Oil production and water ratio change of multiple-fracturing horizontal well water flooding development

Fig. 8 Water injection and pressure rise period

Fig. 9 Shat-in replacement

Fig.10 Production period

Fig.11 Formation pressure as time change

Fig.12 Daily oil and liquid production as time changes

Fig.13 The water ratio of two kinds of water-injection and water injection & production development ways

Fig.14 Oil production with different injection

Fig.15 Formation pressure with different injection

Table 1 Variation of productivity under different well close times

闷井时间/d	初期产能/m³	生产半年产能/(m³/d)	生产一年产能/(m³/d)	最终采收率/%
15	76	23	3	0.989
30	78	24	3	0.992
60	83	24	3	0.994
90	88	24	3	0.996

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