Optimization Of Development And Deployment Parameters Of Carboniferous Reservoirs In C471 Area

With the rapid development of petroleum exploration and development,volcanic fractured reservoirs have been discovered all over the world,and special reservoirs such as people have attracted more and more attention.In recent years,volcanic reservoirs have been discovered in more than 300 blocks or basins in more than 20 countries around the world.Typical large-scale volcanic reservoirs such as the Pampa-Palauka oil reservoir in Argentina,the Jatibarang oil and gas reservoir in the Jawa Basin in Indonesia,the Jijing-Dongpaqi gas reservoir in the Niigata Basin in Japan,and the Fubelo reservoir in Mexico.In the 1960 s and 1980 s,large-scale oil and gas exploration and development were carried out in China.A number of volcanic reservoirs were discovered in Songliao and Liaohe,Sichuan,Bohai Bay and Karamay basins.Although great achievements have been made,volcanic oil and gas The reservoir has the characteristics of complex reservoir type and reservoir-forming conditions,high initial yield but rapid decline,wide distribution and small scale.At present,this type of oil and gas reservoir does not form a mature theory in terms of development mode and mining techniques.It is foreseeable that volcanic rock reservoirs also have broad prospects for exploration and development,and are an important area for China's petroleum industry to increase production and production.The study area is the Carboniferous volcanic reservoir in the C471 well area.At present,the reservoir is in the trial mining stage,at the initial stage of development,with a low degree of recovery,low degree of reserve utilization,abundant geological reserves,and great potential for development.Most of the single wells in the reservoir test mining vertical wells have low output,and the single well productivity difference is large,and the development is difficult.Based on the full understanding of the C471 volcanic reservoirs,this paper summarizes and analyzes the production dynamic characteristics of the reservoirs.The main control factors affecting the single well productivity are determined by different methods,and the energy evaluation is carried out.Based on this,the development methods of such reservoirs are demonstrated.The development technical parameters such as well spacing,well pattern,water avoidance height and horizontal well length are developed.The development optimization scheme is proposed and correspondingly given.Development indicators predict results.This article has the following conclusions and understanding:1)Through the analysis of dynamic characteristics of reservoir development,the initial production capacity of horizontal wells in volcanic reservoirs is 3-8 times of the initial capacity of vertical wells.It is recommended that horizontal wells be developed best.The decline of horizontal well production in volcanic reservoirs is mostly hyperbolic decline and harmonic reduction,and the vertical well production decline is mostly harmonic reduction.2)Study the factors affecting the yield through the grey correlation method and the orthogonal design method,and implement the main controlling factors affecting the production of vertical and horizontal wells,and confirm that the main controlling factors of the vertical well productivity are matrix thickness,crack thickness,perforation thickness,and horizontal well productivity.The main controlling factors are the working system and the length of the horizontal section.3)Combined with production dynamics and numerical simulation analysis,the optimal well spacing is about 250m;the optimal water avoidance height is 230m;the optimal production pressure difference can be 20% of the original formation pressure;the optimal horizontal section length is about 1600 m.4)Through simulation calculation,the most suitable development method for the Carboniferous volcanic reservoir in the C471 well area is the three-dimensional staggered horizontal well network for natural energy development.After 15 years of mining,the recovery degree reaches 10.1%.This paper studies the development of volcanic reservoirs,and the understanding gained is of great significance for guiding the development of volcanic reservoirs in the C471 well area,and has a good effect on the development theory of rich volcanic reservoirs.