Productivity Evaluation Of Cyclic Steam Stimulation Assisted By Radial Well Fracturing In Low Permeability Heavy Oil Reservoir

As the vast majority of oilfields has entered high water-bearing development period,the development of unconventional oil and gas resources,such as low permeability and heavy oil reservoir,gradually gains the attention of people in recent years.The dual characteristic of low permeability heavy oil reservoir,result in the strong sensitivity and the difficult development.Aiming at the low permeability heavy oil reservoir whose development is difficult,the main developmental idea is forming a complete set of reservoir reconstruction and steam injection of thermal recovery.Based on the deep low permeability heavy oil reservoir data of Wang 152 block of Xianhe oil factory,the article established numerical models for hydraulic fracturing,cyclic steam stimulation and radial well technologies,used for their productivity research and comparative evaluation,analysis of factors affecting the productivity,and optimization of the factors.Then through the experiment of hydraulic fracturing whose fracture is guided by radial well,the shape of fracture was researched.On the basis of the experiment,the numerical simulation study of the cyclic steam stimulation assisted by radial well fracturing was conducted.At last,the article conducted the economic evaluation and the uncertainty analysis for the cyclic steam stimulation assisted by radial well fracturing.The research results show that the radial well can guide the fracture of hydraulic fracturing well.The cyclic steam stimulation assisted by radial well fracturing is very effective for the development of low permeability heavy oil reservoir,and the productivity gets the best effect when the number of the radial wells is 4.The result of the economic evaluation show the financial net present value is 1.0922 million yuan,the financial internal rate of return is 35%,and the payback period is 1.31 years.The cyclic steam stimulation assisted by radial well fracturing has good economic benefit for the development of low permeability heavy oil reservoir.