Study and field practice of CO2 foam fracturing technology
DUAN Yaoyao
LU Yongjun
GUAN Baoshan
QIU Xiaohui
WANG Liwei
YANG Zhanwei
Abstract：Low pressure and water-sensitive tight gas reservoir,conventional hydraulic fracturing can easily cause water lock damage and the post-fracturing gel broken fluid was difficult to flow back,which results in production decline.Here,CO2 foam hydraulic fracturing techniques was studied.The techniques included development of acid CO2 foam fracturing fluids,selection of pumping string and injection scheme,optimization design of variable foam quality with variable flow rate,and supporting measures to improve the fracture conductivity.An example in No.11-52-65 well of Sulige gas field,fracturing treatment was successfully carried out in the gas field.The proppant amount achieved up to 49.2 m3 for a single layer.The gel breaking liquid flow back completely without pumping.The daily gas output 2.2 times that of the average single well production in this gas field.The results of empirical study confirmed the effectiveness of the optimization design method and the supporting measures,and it shows the good application prospect of CO2 foam fracturing in low pressure tight gas reservoir.
Keywords：low pressure water sensitive reservoirCO2 foam fracturing techniquesacid associated fracturing fluids
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 14-19 )