丛式水平井钻井平台规划

Drilling pad optimization for oilfield development by cluster horizontal wells

为了解决油田(区块)丛式水平井钻井平台大小、数量和位置等的规划问题,研究了丛式水平井技术条件下平台的大小、数量和位置与油田地面工程建设投资和油气井建井投资之间的内在规律。结果表明,油田(区块)丛式水平井钻井平台大小、数量和位置等的规划问题可以通过建立以油田建设总投资(地面工程建设投资与油气井建井投资之和)最小为目标的混合整型非线性规划模型来求解。应用这一方法,在委内瑞拉奥里乳化油MPE-3区块丛式水平井钻井平台规划中,结合当地地面工程建设费用和建井工程费用,得出均布井网条件下的最优平台模式是12井式,区块最优平台设置数量是27个平台,其中21个平台为12井式,6个平台为18井式,单平台的最大钻井数量为18口井。计算实例表明,采用这种数学规划模型及其求解方法来解决油田(区块)丛式井平台设置问题是可行的。

One of the key issues related to the application of cluster drilling technology to the development of oilfield is to find out the optimum pad number, pad forms and pad locations with minimized investment. The cost effective items involved in the construction of surface facilities and wellbores such as well site and road construction, rig mobilization, flow gathering and metering lines, drilling and well completion, etc, are investigated. A mixed integer non linear mathematic program model with minimized investment is established, where the optimum pad number, pad forms and pad locations for the development of an oilfield are solved. This optimization program is applied to the development of the heavy oilfield, Block MPE-3, Orinoco Belt, Venezuela. In order to find out the optimum pad number, pad forms and pad locations for the 330 horizontal wells proposed by the Oilfield Development Plan of MPE-3, the mathematic program with minimized investment is constructed and successfully solved, which shows that the optimum pad form for the area is 12-well mode, and that 27 drilling pads with different optimum pad forms needed to be constructed over the area at proposed locations based on the local engineering service rates and facilities procurement prices. This successful application shows that it is feasible to construct a mathematic program model with minimized investment to optimize the pad number, pad forms and their locations in the preparation of oilfield development plan by cluster well strategy.