scholarly journals Feasibility study on adjustment of injection-production system in extremely high water cut period

2021 ◽  
Vol 233 ◽  
pp. 01036
Author(s):  
Guoqiang Cao
Keyword(s):  
Feasibility Study ◽  
Production System ◽  
Production Systems ◽  
High Water ◽  
Water Wells ◽  
Well Pattern ◽  
Directional Connectivity ◽  
High Water Cut ◽  
Water Cut ◽  
Oilfield Development

Entering the stage of ultra-high water cut development, affected by faults and irregular well patterns in some areas, there are problems in the development of oilfields such as imperfect injection-production systems, high oil-water wells ratio, low multi-directional connectivity ratio, and complex injection-production relationships. To this end, combined with well seismic and fine reservoir research results, the feasibility study of the injection-production system adjustment was carried out, based on the fine adjustment of the strata well pattern, and through new drilling, supplementary drilling, re-injection, re-production, etc. The well pattern connection rules are conducive to the purpose of adjustment, thereby increasing the recovery rate and improving the effect of oilfield development.

Integrated Solutions for the Redevelopment Plan of Offshore Mature-Oilfield

2021 ◽  
Author(s):  
Hongfu Shi ◽  
Yingxian Liu ◽  
Lifu Jiang ◽  
Jingding Zheng ◽  
Liqin Gan
Keyword(s):  
High Water ◽  
Bohai Bay ◽  
Sand Body ◽  
Well Pattern ◽  
Open Hole ◽  
Average Water ◽  
High Water Cut ◽  
Water Cut ◽  
Stream Lines ◽  
Sand Bodies

Abstract Abundant faults, long oil-bearing intervals (up to 500m), and diverse fluids including conventional oil and heavy oil, result in P oilfield became one of the most complex oil fields in the Bohai Bay. The main characters ofinitial development plan are directional well with commingle production, open hole completion, large draw down, high oil production rate, and reverse nine-point well pattern. At present, the oilfield has entered a stage of high water cut, with average water cut more than 85%. What can we do next, decommissioning or rebirthing? An integrated solution was proposed to redevelop the oilfield which focus on the layers’ subdivision, the fine description of the sand body,a large number of horizontal wells on the top of the water-flooded layer are used to tap the potential, increase the water injector to transform the stream lines and rebuild the reservoir pressure, and search for potential sand bodies to increase reserves.

scholarly journals Effects of oil viscosity on waterflooding: A case study of high water-cut sandstone oilfield in Kazakhstan

2020 ◽  
Vol 12 (1) ◽  
pp. 1736-1749
Author(s):  
Jincai Wang ◽  
Zifei Fan ◽  
Lun Zhao ◽  
Li Chen ◽  
Jun Ni ◽  
...  
Keyword(s):  
High Water ◽  
High Viscosity ◽  
Oil Wells ◽  
Oil Reservoirs ◽  
Low Viscosity ◽  
Well Pattern ◽  
Remaining Oil ◽  
Oil Water ◽  
High Water Cut ◽  
Water Cut

Abstract After a sandstone oilfield enters the high water-cut period, the viscosity of crude oil has an important influence on remaining oil distribution and waterflooding characteristics under the same factors of, e.g., reservoir quality and development methods. Based on a comprehensive interpretation of the waterflooded layers in new oil wells, physical simulation experiments, and reservoir numerical simulations, we analyzed the waterflooding laws of a high water-cut sandstone reservoir with different oil viscosities in Kazakhstan under the same oil production speed, and we clarified the remaining oil potential of reservoirs with different viscosities and proposed corresponding development measures. The results show that low-viscosity oil reservoirs (1 mPa s) have uniform waterflooding, thick streamlines, small waterflooding areas, and low overall waterflooding degrees because of their homogeneous oil–water viscosities. However, within waterflooded areas, the reservoirs have high oil displacement efficiencies and high waterflooding degrees, and the remaining oil is mainly concentrated in the unwaterflooded areas; therefore, the initial production and water cut in new oil wells vary significantly. High-viscosity oil reservoirs (200 mPa s) have severe waterflooding fingering, large waterflooding areas, and high overall waterflooded degrees because of their high oil–water mobility ratios. However, within waterflooded areas, the reservoirs have low oil displacement efficiencies and low waterflooding degrees, and the remaining oil is mainly concentrated in both the waterflooded areas and the unwaterflooded areas; therefore, the differences in the initial production and water cut of new oil wells are small. Moderate-viscosity oil reservoirs (20 mPa s) are characterized by remaining oil distributions that are somewhere in between those of the former two reservoirs. Therefore, in the high water-cut period, as the viscosity of crude oil increases, the efficiency of waterflooding gradually deteriorates and the remaining oil potential increases. In the later development, it is suggested to implement the local well pattern thickening in the remaining oil enrichment area for reservoirs with low viscosity, whereas a gradual overall well pattern thickening strategy is recommended for whole reservoirs with moderate and high viscosity. The findings of this study can aid better understanding of waterflooding law and the remaining oil potential of reservoirs with different viscosities and proposed corresponding development measures. The research results have important guidance and reference significance for the secondary development of high water-cut sandstone oilfields.

Practice and Theory of Restructuring Water Flooding Series in Sabei Oilfield

2012 ◽  
Vol 616-618 ◽  
pp. 690-695
Author(s):  
Ji Cheng Zhang ◽  
Hong Mei Li
Keyword(s):  
High Water ◽  
Water Flooding ◽  
Dynamic Regulation ◽  
Primary Network ◽  
Infill Drilling ◽  
Development Area ◽  
High Water Cut ◽  
Water Cut ◽  
Oilfield Development

In Sabei Development Area, with the developments of oilfield infill wells, the production targets of each set of well nets went bad and had interleaved distributions with old well patterns. At the same time, polymer flooding well patterns made the conflict of cohesion and dynamic regulation outstanding. Especially, Beierdong, which was the earliest block using infill drilling modification, got the good development effect at beginning, however, with the progress of oilfield development, there were some troubles in the development period with extra high water, such as long section of perforation, obvious inconsistencies between formations and high water of layers, which brought difficulties to dynamically adjusting. To fully exploit the remaining oil potential, this paper selected 1.30 km2 west blocks in Beierdong, made tests about sediment group restructuring to improve water flooding development effect, redistribute the series of strata and redistribute the flooding network according to the characteristics of development between the layers, combined comprehensive consideration with follow-up adjustment such as primary network, injection production system and type II reservoir the tertiary oil production, optimized the layers combination and well patterns arrangement, finally formed technical ideas of high water cut layers adjustment and well nets evolution.

Research on Production Decrease Regularity for an Extra High Water Cut Stages of Xingnan Development Zone

2014 ◽  
Vol 1010-1012 ◽  
pp. 1654-1664
Author(s):  
Ji Cheng Zhang ◽  
You Lv ◽  
Qi Li ◽  
Xiao Yue Wang
Keyword(s):  
High Water ◽  
Practical Significance ◽  
Type Curve ◽  
Development Zone ◽  
Well Pattern ◽  
Dislocation Type ◽  
Binary Regression Analysis ◽  
High Water Cut ◽  
Water Cut ◽  
Error Method

In recent years, Xingnan development zone have totally gone into high water cut stages and high recovery degree reserves from the partial period, facing with a stern fact that it transitions from a basic injected and produced fluid balance to a serious imbalance. Therefore, it is of important practical significance for predicting the production of remaining oil and improving recovery efficiency that strengthen the research of diminishing prediction of each well pattern. In this paper, by using a series means of graphical method, try and error method, curvilinear dislocation, type curve matching method and binary regression analysis, we comprehensively judged the production decline types of different well patterns, and calculate the production decline rate of each set of well pattern..

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.

Experimental Study on Aging Oil Dehydration Technology Optimization in Yushulin Oilfield

2011 ◽  
Vol 393-395 ◽  
pp. 746-749 ◽  
Author(s):  
Wu Long Zheng ◽  
Ren Shan Pang
Keyword(s):  
Strong Stability ◽  
High Water ◽  
Transportation Mode ◽  
Treatment Processes ◽  
Power Frequency ◽  
High Water Cut ◽  
Water Cut ◽  
Electrical Impulses ◽  
Oilfield Development ◽  
Frequency Pulse

As the oilfield development entering into the stage of high water cut, more and more aging oil is produced during oil production, transmission and ground treatment processes due to the changes of mining and transportation mode. The emulsion has a strong stability because of the complicated ingredients of the aging oil. So the conventional dehydration methods are hard to reach the dehydration effect. Therefore, to make sure the aging oil dehydration meet the quality requirements, ensure the oilfield production system running smoothly, enhance the economic efficiency are very important. So the ultrasonic, thermal chemical and electrical impulses are further carried out. Through the experimental results, it is obvious that under the conditions of the 2 kHz in power frequency, pulse dehydration time for 90~120min.

Control of dominant seepage flow on high water cut reservoirs with vector well pattern

2016 ◽  
Author(s):  
Xiaocong Lyu ◽  
Huiqing Liu ◽  
Zhanxi Pang ◽  
Lizeng Xing ◽  
Yongping Jiang ◽  
...  
Keyword(s):  
Seepage Flow ◽  
High Water ◽  
Well Pattern ◽  
High Water Cut ◽  
Water Cut

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.

Sign in / Sign up

Export Citation Format

Share Document