Application of multi-lateral horizontal well technology in extra-heavy oil reservoir development of Shanjiasi oilfield

Through systematic research on extra-heavy oil reservoir characteristics of Sha-1 member in Shan-2 block of Shanjiasi oilfield,the huge advantages of marginal reserves of heavy oil reservoir with multi-lateral horizontal wells have been discussed.The multi-lateral horizontal wells have the characteristics of big drainage area,high single well production and low drilling cost and can realize the effective use of marginal reserves of heavy oil.By taking Sha-1member of Shan-2 block of Shanjiasi oilfield as an example,from the optimized position of multilateral horizontal wells deployment,parameters optimization and trajectory design and optimization,the geologic design of multilateral horizontal wells technology has been described.Meantime,the real-time tracking analysis in the process of multilateral horizontal wells drilling has been carried out so as to achieve the efficient development of marginal reserves of heavy oil.