Organization
MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan 430100, China
School of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
摘要
研究工区未动用储量大，是稠油开发和增产的重点区域，但是工区应力分布状况不明确，不能对钻井、压裂等施工方案形成有效指导。为明确工区的地质力学和岩石力学特性，建立了适用于该区的横波时差预测模型，基于此预测模型开展了精细地层划分和三维地质建模，通过对岩石力学参数计算结果的克里金插值，完成工区的地应力场建模。建模结果显示：工区地层物性良好，最大主应力主要分布在30~34 MPa，最小主应力主要分布在27~29 MPa，地层受逆断层控制。该研究在偶极声波施工较少的情况下，利用改进的横波预测完成了地应力场的刻画，在建模结果的指导下，新钻水平井在压裂施工后日产油量达25.7 t，累计产油量较前期开发老井增加了99.1%，实现了稠油油藏的有效开发。
Abstract
The study area has large unused reserves, which is a key area for heavy oil development and production increase. However, the stress distribution in the work area is not clear, and it cannot provide effective guidance for drilling, fracturing and other construction programs. In order to clarify the geomechanics and rock mechanics characteristics of the work area, a shear wave time difference prediction model suitable for this area was established. Based on this prediction model, fine stratigraphic division and 3D geological modeling were carried out. Through the Kriging interpolation of the calculation results of rock mechanical parameters, the in-situ stress field modeling and rock mechanical parameter modeling in the work area are completed. The results show that the physical parameters of the formation in the work area are good, the maximum principal stress is mainly distributed in 30￣34 MPa, the minimum principal stress is mainly distributed in 27￣29 MPa, and the formation is controlled by reverse faults. In this study, under the condition of less dipole acoustic construction, the improved shear wave prediction was used to complete the characterization of the in-situ stress field. Under the guidance of the modeling results, the daily output of the completed horizontal well after fracturing operation reaches 25.7 t, and the accumaltion production is increased by 99.1% than the previous old development wells, realizing effective development of heavy oil reservoirs.
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