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Optimization of Horizontal Well Parameter Based on Orthogonal Test Method

DONG Jia-xin1,TONG Min1,ZHANG Jin2,ZHU Li-Yao1,YUAN Da-wei1(1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 2.INT Mudlogging Dept of GWDC,Beijing 100010,China)  
In making sensitivity analysis of productivity parameters in horizontal wells,the traditional analysis usually focus on the influence of the individual parameter,and little compare the different parameters to influence of horizontal well productivity,thus the influence of the parameter combination on the horizontal well productivity is ignored.In this paper,we use the orthogonal test method to illustrate the influence of productivity parameters in horizontal wells and identify the order of each influential factor from strong to weak as follows:Horizontal permeability Kh(A),effective thickness h(C),length of the horizontal sector L(B),viscosity of the underground gas μ(E),anisotropy coefficient β(D),Z-factor of natural gas Z(G),and formation temperature T(F).The optimal productivity parameters assemblage of horizontal wells is A5B5C4D1E1F4G2.In combination with result of comprehensive variance and data from CL and LS gas field,the prominent influential factors of horizontal well productivity are length of the horizontal sector,horizontal permeability,and effective thickness.
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