考虑裂缝干扰的气藏压裂水平井产能预测模型

基于压裂水平井井身结构复杂,需要建立考虑裂缝参数变化且符合水平井渗流特征的产能预测模型.为准确预测压裂水平井产能,通过保角变换和势的叠加原理,建立新模型,不仅考虑裂缝长度、裂缝间距、裂缝夹角的变化对压裂水平井产能的影响,还考虑裂缝间的相互干扰.结果表明:压裂水平井产能随着裂缝条数、长度和裂缝夹角的增加而增大.模型通过现场验证,计算单井无阻流量与试采结果对比,相对误差为8.3%,计算结果较为准确.

A new productivity prediction model of fracturing horizontal well in gas reservoir taking into account the mutual interference between the fractures

Because the horizontal well fracturing technique can increase drainage area of the single well,and effectively connect the reservoir,it has become an important means to improve gas well flow rate in low-permeability gas reservoirs.During its application,it is difficult to build a productivity predicting model of fracturing horizontal well which takes the changes of reservoir characteristics and fracture parameters into account.Aiming at this problem,the paper established a new fracturing horizontal well productivity prediction model,it takes into account not only the impact of the fracture half-length,fracture spacing and fracture angle changes on horizontal well productivity,but also the mutual interference between the fractures.Through on-site verification,the results of the model are accurate.