Research On The Development Test Plan Of The Small Well Spacing In The Huang 39 Well Block Of Jichang Oilfield

Jiyuan Oilfield is located in the widest Yishan slope of the Ordos Basin,and its main oil reservoir are Chang8 and Chang9 layers.Showing from the testing and production test data,The reservoir of Yangchang Formation in this region has the characteristics of the extra low-porosity,extra low-permeability,low-yield,low abundance and heterogeneity.The Triassic Chang 81 and Chang 91 layers of Huang 39 Well Block in Jiyuan Oilfield are the main object of study.Based on petroleum geology theory,this paper systematically studies the sediment structure,sedimentary microfacies,distribution of sand body,reservoir physical property and fluid properties.And based on these,development program is demonstrated reasonably.By combination of numerical reservoir simulation,economic indicator analysis and contrast,the skewed nine-spot pattern is selected as the well pattern,and the well spacing density,wellhead spacing row spacing is determined.According to data from the fracture pressure test,the maximum water injection pressure is calculated in water injection well,and flowing bottomhole pressure is determined.Using various methods,the individual well deliverability is figured out.By the use of Experience formula method,Well Spacing Density method and analogy method,the recovery efficiency of water-drive-oil is predicted.Finally,based on these study results,the development program deployment is completed,and further prediction is made for some main development index,such as oil recovery rate,degree of reserve recovery,and cumulative production.The optimized development program can help ensure high efficient in production,keep high and stable yield,and obtain high hydrocarbon recovery in Huang 39 Well Block of Jiyuan Oilfield.Meanwhile,this study can provide guide for the development program deployment of other same oilfields.