Research On Bottom Water Reservoir Development Strategies

Reservoir with bottom water reservoir in China accounted for a substantial proportion of its abundant reserves. Except the end has many natural water reservoir outside. With the secondary depletion of oi1fields, the developing characteristic of more and more oilfield incline to bottom water reservoir continuously. After 7 years of development. B oilfield Y block reveal problems gradually as below:1. Present bottom water reservoir feature, the bottom water coning seriously, flooding seriously, the production decline quickly, up to now, allof the 16 oilwells in the northwest of Y block breakthrough, water ratio all above 85%, Affected by bottom water coning, the BOPD began to decline rapidly from 2006, The development effect became bad sharply.2. The draw on degree of water drive reserves is low, the current recovery ratio in current well network conditions is 8.33%. From the calculated results and the overall development effect of view, on the current status of water flooding, the development effect of waterflood far from ideal. 3.the absorbing capacity of layer is poor, augmented injection is difficult, the producing energy drop rapidly. Up to now, 53.8% of downflow wells can not meet the requirements of injection allocation, the affection state injection is bad.Subject to Y to the bottom water reservoir for the object, we adapt the reservoir engineering and numerical simulation methods,On the basis of fully understanding the water/oil movement and development law, study the development policy limit of bottom water reservoir, and then put forward the countermeasures that would effectively improve the effectiveness of oi1field development.With the constant deepening of field development,Y oilfield geological understanding of the changes, especially oi1-bearing area,reservoir thickness and geological reserves are major changes. Test mining production showing a formation energy is weak, single-well production decline rapidly, moisture content tended to rise. Production aquifer wells a long time high,the output low,in the B wells constructed higher moisture content.The analysis of overall moisture content in the northwest of Y oilfield: the northwest of Y blocks maintain a low moisture content and stability from the production to see a lot of water in 2003. The oil well water breakthrough one after another which put into production after 2006. The northwest block entered a period of strong flooding. 3 months of 2010, the average moisture content was 95%.Combination of geological research results,in view of the current oi1 field development of the contradictions arising in the course of, in accordance with the"results-based geological studies,reservoir engineering theory as a guide,To a comprehensive analysis of reservoir performance,reservoir simulation as a means to rational deployment of the optimal field development program",the technical ideas,the use of reservoir engineering and numerical simulation methods,to carry out the characteristics of non-permeability layer, reservoir characterization, the law of production decline and the increased law of containing water applied research. Evaluate and sum up the form of coning water in bottom water reservoir, divided into two cases with and without interlayer. Separately analysis critical output and water breakthrough time, on this basis, proposed a method of improve the effect of reservoir development--development of horizontal well. After analysis the accommodation of horizontal well development, obtain the conditions of horizontal well development, and then ascertain the critical producing pressure drop and critical outcome of the horizontal well in bottom water reservoir. In view of reasonable location and length of horizon segment, fix the reasonable parameters of horizon section by the method of reservoir engineering and numerical simulation separately, while analyse various of affecting factors syntheticaliy.Eventually form a reservoir to meet the current reality,operability than strong development Strategies,through the implementation of the outcome,improve and optimize the oi1field injection- production system,to supplement and maintain the formation energy,improve the speed and oilfield finally adopted yield.