东胜气田什股壕地区水平井高产水原因及储集层改造

Reasons of High Water Yield and Reservoir Reformation in Horizontal Wells in Shiguhao Area of Dongsheng Gas Field

东胜气田什股壕地区部分水平井测试中高产水,影响了气田的产能建设。为查明气藏类型及气水分布,结合单层产出特征,对测试井进行筛选,应用交会图版分析,建立了下石盒子组气藏气水层的测井识别标准,并查明了盒2段和盒1段的气水分布特征。分析施工参数与压裂缝高的关系后认为,施工排量对压裂缝高影响较大,并建立了气藏压裂规模与压裂缝高的关系,从而可有效判断不同压裂规模下的压裂缝高。结合水平段钻遇测井电性参数、微裂缝分布、压裂缝高以及储集层和隔层厚度等参数,明确了造成水平井高产水的3种原因,提出了"一井一策"的储集层改造对策。

High water yield occurs during production test in some horizontal wells in Shiguhao area of Dongsheng gas field,which impactsthe productivity construction in the gas field.In order to define gas reservoir type and hydrocarbon distribution,the paper conducts well selection for test by combining with single layer production characteristics,establishes well-logging standards for gas zone and aquifer identification for the Lower Shihezi formation on the basis of crossplot chart analysis and determines the gas and water distribution in He1andHe2section.After analyzing the relationship between construction parameter and hydraulic fracture height,it is considered that construction displacement has a significant impact on hydraulic fracture height.The relationship between fracturing scale and hydraulic fractureheight in gas reservoirs is established and fracture heights under different fracturing scales can be effectively determined.Combined withelectrical parameter,microfracture distribution,fracture height and thickness of reservoir and interlayer etc.,3reasons causing the high water yield are identified in horizontal wells and a“one measure in one well”reservoir reformation countermeasure is put forward.