Water injection in unconventional reservoirs
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Water flooding
Tight oil
Water cut
The formula systems of profile control and oil displacement have been screened according to reservoir characteristics, oil property and injected water quality of Hai 1 heavy oil reservoir developed by water flooding. The influencing factors of gel performance are evaluated. Field tests have been performed for typical well groups to adjust the formula system and injection process according to practical production conditions by following the principle of reducing risk and ensuring success. Comprehensive evaluation has been made for the effect of profile control and oil displacement, the improvement of water well conditions, and the effectiveness of water injection, etc., by using EOR theory and empirical equations as well as dynamic and static data. The result shows that the producing degree and the recovery factor of water flooding have increased after profile control and oil displacement. This study provides reference to converting oilfield development strategy and improving oil recovery.
Water flooding
Water cut
Oil well
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The technology of integrated injection - plugging - profile control has been proposed for Haiwaihe Oil- field in accordance with the problems occurred during water flooding.With well group as flooding unit,the tech- niques of fracturing and block removing,stratified waterflooding,in- depth profile control,and chemical water plugging for oil and water wells are integrated and optimized to improve recovery factor.Field application has seen good result,daily oil production has sustained over 1 000 t/d for 3 years,thus realizing efficient develop- ment of the oilfield.
Water flooding
Injection well
Oil Production
Water cut
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Water cut
Water flooding
Oil Production
Injection well
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With the deepening of the oilfield development, oil field has entered the high water cut period. The rate of water cut increasing and production decline are accelerate. It is needed to adjust the way of exploitation in order to improve oilfield exploitation effect. Cyclic water flooding is one of effective means to improve oilfield development effect with the advantages of small investment, quick effect, reduce inefficient output and improve oilfield overall development benefit. In this paper, we use the means of numerical simulation to study the injection timing and reasonable working systems of different types of Wells. Technical basis is provided for further study and field test.
Water cut
Water flooding
Oil Production
Investment
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The reservoir type of Yingtai Oil Field is natural water flooding structural reservoir. Now it has entered ultra-high water cut stage. Based on reservoir study, the development performance is improved through adjustment and potential tapping combining with matching techniques.
Water cut
Water flooding
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This article has obtained the conclusion that oil displacement efficiency changes as wettability of the longterm water-injection reservoir changes into water affinity by applying the technological means of indoor high temperature and high pressure physical analogue experiment,oil deposit numerical simulation and so on.This research result will offer some guidance and reference to the adjustment of the developing plan in high water oil-field development.
Water flooding
Water cut
Fault block
Reservoir Simulation
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Using water flooding technology in intermediate zone,minute-fracture pressure water injection and profile control etc.technique carry out rational water flooding,can reach the goal of systematical development heterogeneous reservoir and make degree of water-drive and oil displacement efficiency of low ooze layer improve,formation pressure and productivity of correspondnece oil well increase.Through field application of the water injection oil displacement technique in Qiaokou Oilfield,the results show that the technology can slow down effectively natural lapse of oilfield and keep stable production and high production of oilfield.
Water flooding
Water cut
Oil Production
Steam injection
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Aim To improve waterflooding effectiveness of Kelamayi group oil field in Wu-5 well area.Methods Based on the sufficient study in static state of the resenroir,by use of the results of the pressure test,the production profiles,the injection profiles and the data of production,study kinds of geology and production factors which afected and controlled the movement of injection water.Results The injection water was mainly afected by structure,sedimentary microfacies and resenroir property in geology,and waterflood timing,water flooding regime,water intake per unit thickness in engineering.Conclusion These provided experience and reference for developing some kind reservoir.
Water flooding
Water cut
Oil Production
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The so-called water flooding characteristic curve refers to the oilfield water injection (or natural water drive) development process, a relationship between curve cumulative oil production, cumulative water production and accumulation of fluid production. These curves have been widely used for water injection development of dynamic and recoverable reserves forecast. After many years of practical application, summed up the four kinds of water drive characteristic curve, they have a good practical significance. Recoverable reserves are important indicators of field development is the main basis for planning and design, the application of waterflooding characteristic curve can be predicted oil recoverable reserves. Four water flooding characteristics discussed above curve is mainly applied in high-permeability oil field, which did not consider starting pressure, but should consider the impact of low permeability oilfield actuating pressure gradient on the moisture content.
Water flooding
Water cut
Oil Production
Pressure gradient
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Water flooding
Water cut
Oil Production
Oil viscosity
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