The Research of Water Flooding Measures in Late High Water Cut Period of Secondary Reservoirs

2014 ◽  
Vol 703 ◽  
pp. 308-311
Author(s):  
Kao Ping Song ◽  
Cheng Cheng Wang ◽  
Cheng Fu ◽  
Xiao Hui Wu
Keyword(s):  
Numerical Simulation ◽  
Water Injection ◽  
High Water ◽  
Water Flooding ◽  
Injection Timing ◽  
Recovery Efficiency ◽  
Geological Characteristics ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

D aqing o ilfield is in high water cut stage and always appears two phenomenon called "two speeds" and "two low". Based on the geological characteristics of the block, the current exploration wells arrangement and producing dynamics, two sets programs of water injection intensity and water injection timing were designed. Through the numerical simulation prediction of the two sets of 16 programs, the optimization results are 9 injection intensity and 93% of water cut. The cumulative oil producing capacity is 1402.41×104t and the cumulative increasing oil capacity is 6.26×104t and the increasing value of the recovery efficiency in Secondary oil layer is 1.33% when the water cut is 98%.

scholarly journals Techniques for improving the water-flooding of oil fields during the high water-cut stage

2019 ◽  
Vol 74 ◽  
pp. 69 ◽  
Author(s):  
Kuiqian Ma ◽  
Ao Li ◽  
Shuhao Guo ◽  
Jieqiong Pang ◽  
Yongchao Xue ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Water Injection ◽  
Reduction Rate ◽  
High Water ◽  
Water Flooding ◽  
Variable Intensity ◽  
Remaining Oil ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

The multi-layer co-exploitation method is often used in offshore oilfields because of the large spacing between the injection and production wells. As oilfields gradually enter the high water-cut stage, the contradiction between the horizontal and vertical directions becomes more prominent, and the distribution of the remaining oil is more complex. Oilfields are facing unprecedented challenges in further enhancing oil recovery. Using oilfield A, which is in the high water-cut stage, as the research object, we compiled a detailed description of the remaining oil during the high water-cut stage using the information collected during the comprehensive adjustment and infilling of the oilfield. In addition various techniques for tapping the potential reservoir, stabilizing the oil, and controlling the water were investigated. A set of key techniques for the continuous improvement of the efficiency of water injection after comprehensive adjustment of high water-cut fields was generated. Based on the determined configuration of the offshore deltaic reservoir, a set of detailed descriptive methods and tapping technology for extracting the remaining oil in the offshore high water-cut oilfield after comprehensive adjustment was established. By considering the equilibrium displacement and using a new quantitative characterization method that includes displacement, a new technique for determining the quantity of water that needs to be injected into a stratified injection well during the high water-cut stage was established. Based on the principle of flow field intensity reconfiguration, a linear, variable-intensity, alternating injection and withdrawal technique was proposed. With the application of this series of techniques, the increase in the water content was controlled to within 1%, the natural reduction rate was controlled to within 9%, and the production increased by 1.060 × 107 m3.

scholarly journals New Waterflooding Characteristic Curves Based on Cumulative Water Injection

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Zhiwang Yuan ◽  
Zhiping Li ◽  
Li Yang ◽  
Yingchun Zhang
Keyword(s):  
Characteristic Curve ◽  
Water Injection ◽  
Material Balance ◽  
Oil Production ◽  
High Water ◽  
Difficult Problem ◽  
Prediction Errors ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

When a conventional waterflooding characteristic curve (WFCC) is used to predict cumulative oil production at a certain stage, the curve depends on the predicted water cut at the predicted cutoff point, but forecasting the water cut is very difficult. For the reservoirs whose pressure is maintained by water injection, based on the water-oil phase seepage theory and the principle of material balance, the equations relating the cumulative oil production and cumulative water injection at the moderately high water cut stage and the ultrahigh water cut stage are derived and termed the Yuan-A and Yuan-B curves, respectively. And then, we theoretically analyze the causes of the prediction errors of cumulative oil production by the Yuan-A curve and give suggestions. In addition, at the ultrahigh water cut stage, the Yuan-B water cut prediction formula is established, which can predict the water cut according to the cumulative water injection and solve the difficult problem of water cut prediction. The application results show Yuan-A and Yuan-B curves are applied to forecast oil production based on cumulative water injection data obtained by the balance of injection and production, avoiding reliance on the water cut forecast and solving the problems of predicting the cumulative oil production of producers or reservoirs that have not yet shown the decline rule. Furthermore, the formulas are simple and convenient, providing certain guiding significance for the prediction of cumulative oil production and water cut for the same reservoir types.

scholarly journals Experimental study on waterflooding development of low-amplitude reservoir with big bottom water

2021 ◽  
Author(s):  
Yanlai Li ◽  
Jie Tan ◽  
Songru Mou ◽  
Chunyan Liu ◽  
Dongdong Yang
Keyword(s):  
Bottom Water ◽  
Water Injection ◽  
Water Reservoir ◽  
High Water ◽  
Recovery Factor ◽  
Low Viscosity ◽  
Well Spacing ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

AbstractFor offshore reservoirs with a big bottom water range, the water cut rises quickly and soon enters the ultra-high water cut stage. After entering the ultra-high water cut stage, due to the influence of offshore production facilities, there are few potential tapping measures, so it is urgent to explore the feasibility study of artificial water injection development. The quasi-three-dimensional and two-dimensional displacement experiments are designed using the experimental similarity criteria according to the actual reservoir parameters. Several experimental schemes are designed, fluid physical properties, interlayer distribution, and development mode according to the actual reservoir physical properties. Through the visualization of experimental equipment, the bottom water reservoir is visually stimulated. The displacement and sweep law of natural water drive and artificial water injection in bottom water reservoir with or without an interlayer, different viscosity, and different well spacing is analyzed. The following conclusions are obtained: (1) For reservoirs with a viscosity of 150 cp. The recovery factor after water injection is slightly higher than before water injection. However, the recovery factor is lower than that without injection production. The reason is that the increment of injection conversion is limited to reduce one production well after injection conversion. (2) For reservoirs with a viscosity of 30 cp. The recovery factor after injection is 39.8%, which is slightly higher than 38.9% without injection. (3) For reservoirs with a viscosity of 150 cp. In the case of the interlayer. The recovery factor after injection is 30.7%, which is significantly higher than 24.8% without injection. (4) After the well spacing of the low-viscosity reservoir is reduced, the recovery factor reaches 46.1%, which is higher than 38.9% of the non-infill scheme. After the infill well in a low-viscosity reservoir is transferred to injection, the recovery factor is 45.6%, which has little change compared with non-injection, and most of the cumulative production fluid is water. The feasibility and effect of water flooding in a strong bottom water reservoir are demonstrated. This study provides the basis for the proposal of production well injection conversion and the adjustment of production parameters in the highest water cut stage of a big bottom water reservoir.

Mechanisms of water flooding characteristic curve upwarping at high water-cut stage and influencing factors

2019 ◽  
Vol 64 (26) ◽  
pp. 2751-2760 ◽  
Author(s):  
Jun Yao ◽  
Lei Zhang ◽  
Hai Sun ◽  
Tao Huang ◽  
Yongfei Yang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Characteristic Curve ◽  
High Water ◽  
Water Flooding ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

On the Feasibility of Applying Electric Field to Increase Oil Recovery in Old Oil Field

2014 ◽  
Vol 900 ◽  
pp. 677-680
Author(s):  
Chun Hong Nie
Keyword(s):  
Electric Field ◽  
Oil Recovery ◽  
Water Injection ◽  
High Water ◽  
Oil Field ◽  
Thin Layers ◽  
Stable Yield ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

This paper has discussed the characteristics, roles, feasibility and obvious effects of the technology by applying electric field to enhance oil recovery when the oil field is in high water cut stage and super high water cut stage. In view that most oil wells in old oil field have entered into the super high water cut production, the remaining oil in the main reservoir is in fragmented distribution with poor results of water injection and new reserves of oil mostly have a low penetration rate and are thin layers of poor physical properties, the use of the direct current field in period of high water cut is the best policy to achieve high and stable yield and is fairly promising.

The Research of Remaining Oil Distribution in High Water Cut Oilfield

2012 ◽  
Vol 591-593 ◽  
pp. 2555-2558
Author(s):  
Cheng Fu ◽  
Bin Huang
Keyword(s):  
High Water ◽  
Water Flooding ◽  
Production Plant ◽  
3D Geological Modeling ◽  
Oil Distribution ◽  
High Efficient ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut ◽  
Oilfield Development

The western South-eight block which is located in the comprehensive tap demonstration area of NO.2 oil production plant, has already gone through three years’ fine development. The production has been stable, the rising amplitude of comprehensive water cut has been small, and the natural decline rate has been controlled effectively. But with the deep development, this block has gone into the late ultra-high water cut stage. To maintain high efficient water flooding development is more and more difficult, therefore fine 3D geological modeling and reservoir numerical simulation work have been carried out. And some practical residual oil saturation diagrams have been put forward finally towards this block, which has provided a reliable basis for the next oilfield development.

Cyclic Injection Scheme Optimization Research in Gaotaizi Reservoirs of Daqing Oilfield

2013 ◽  
Vol 803 ◽  
pp. 334-337
Author(s):  
Ji Hong Zhang ◽  
Zi Jian Zhou ◽  
Xi Ling Chen ◽  
Ming Jun Liu
Keyword(s):  
Effective Means ◽  
High Water ◽  
Oil Field ◽  
Water Flooding ◽  
Injection Timing ◽  
Scheme Optimization ◽  
High Water Cut ◽  
Water Cut ◽  
Technical Basis ◽  
Oilfield Development

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.

Analysis all Kinds of Reservoir Water Degree Condition of East Xing Six District of Daqing Oilfield

2013 ◽  
Vol 868 ◽  
pp. 585-588
Author(s):  
Yi Kun Liu ◽  
Xue Ming Wang ◽  
Shi Yuan Shao ◽  
Ming Yang ◽  
Yong Ping Wang
Keyword(s):  
High Water ◽  
Oil Field ◽  
Water Flooding ◽  
Reservoir Water ◽  
Thickness Change ◽  
Degree Condition ◽  
Well Pattern ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

East Xing Six District of Daqing oilfield development has 50 years of history, the block has entered high well density, high water cut stage. The apricot East Xing Six District demonstration zone development belongs to the continental sedimentary system, it has reservoir types and physical properties have large differences, It was long-term effected by injected water, after water flooding, water degree condition becomes very complex and unpredictable, so the washing condition analysis is an important guarantee for Daqing oilfield stable production. Using the oil field sealed coring well data, various types of reservoirs washing degree thickness change and growth are analyzed, We can know that with the further water flooding development and well pattern infilling, all kinds of oil reservoir production status; and then analyzes the potential distribution of the oilfields, and provides a basis for the development of the block and the adjustment of the next step of work, has an important guiding significance.

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