Sulige The Lithology Gas Reservoir Development Effect Evaluation

Sulige gas field, one of the main natural gas production base of Changqing oil field, have more than 6000 Sq km gas-bearing area and 530 billion cubic meters proved reserves. As the end of 2010, the cumulative gas production of gas field break through 20 billion cubic meters. As the expand of capacity building and extend of production time, the gas field gradually exposed many production problems, just like different type wells show significant differences on production performance, the uneven decline of reservoir pressure, stable production become more and more difficult and low gas recovery, etc. How to objectively evaluate the development effect of Sulige gas field has became the focus of attention. This thesis, Su 20, Su-25 blocks as the research object, carried out evaluation of development effectiveness, achieved the corresponding results.(1) After analysis of gas production in the traditional methods based on the adaptability of gas field, established the unsteady flow capacity evaluation method and effectively used to determine the gas production capacity. Obtained the initial capacity of a total of 328 production wells in Su 20, Su-25 blocks. Established the distribution of the initial capacity and variation of gas production.(2) Comprehensive utilization of a variety of dynamic analysis methods, Obtained the average single well controlled reserves and the formation parameters such as single well radius of influence. Recognized the control degree of reserves at different well spacing. Came to the important conclusion of current well spacing have low level of reserves control. And studied to determine the reasonable well spacing of the gas field(3) Sulige gas field have high recovery of dynamic geological reserves. The ultimate recovery under the designed gas well network only can reach 32%-37%, due to the low control of geological reserves.(4) According to the dynamic capacity, obtained the reasonable production allocation ratio and gas production of I, II, III class production wells in Su 20 and Su-25 blocks. For the realization of various types of gas field production allocation provides a reasonable basis.(5) Forecasting results of many development index, which contains all of 328 production wells'stable time of single well, the average gas recovery of stable period, the average gas recovery before abandonment and recovery ratio, show that the development effect will be different while development of gas fields with a reasonable yield will get better results compare to the current mode of development.