摘要
塔中东部寒武系深层高温含膏白云岩为高压低渗的储层。为了进一步认识塔中东部寒武系白云岩储层性质、优化储层改造方案,取X1C井露头及Y5井岩心进行实验研究,研究认为,泊松比相对较高,杨氏模量适中,剪破坏条件下塑性特征明显,加砂难度大,表面溶蚀程度和不均匀刻蚀程度较低;含膏白云岩酸蚀裂缝导流能力低于白云岩;闭合酸压工艺可以较明显提高裂缝导流能力。从X1C井、Y5井施工分析来看,测试油压迅速下降、油气产量低,说明含膏云岩基质渗透性横向连通性差,现有的改造工艺只是改善井筒和附近地层的连通性;压裂裂缝导流能力优于酸压,压裂更好地连通了井筒与地层;建议下一步试验复合改造工艺(如酸携砂压裂工艺)。
The cambrian dolomite reservoir with gypsum in Eastern Tazhong area is a high pressure and low permeability reservoir. In order to understand the properties of dolomite and optimize the project of reservoir reconstruction,a series of experimental study were done by taking the outcrop in well X1 C and the core in well Y5 as laboratory samples,the experiment results showed that the dolomite has high Poisson ratio, moderated Young's modulus,obvious plastic characteristic under the condition of shear failure,difficult sand- fracturing,low surface dissolution degree and uneven etching degree,and acid etched fracture conductivity of gypsum dolomite was lower than that of dolomite,closed acid fracturing technology could obviously improve the fracture conductivity. According to the analysis of well X1C and well Y5 's operation situation,some opinion was obtained,such as(1) during the flowing well testing,the pressure and the production of oil and gas decreased rapidly,what indicated that lateral connectivity and permeability of the gypsum dolomite reservoirs was poor and the existing fracturing technology only improved the connectivity of reservoir around well;(2) hydraulic fracturing was better than acid fracturing in the conductivity and connectivity;(3) acid- carrying sand fracturing technology should be studied and applied in the gypsum dolomite reservoirs to improve oil / gas production.
出处
《钻采工艺》
CAS
北大核心
2016年第2期64-66,4,共3页
Drilling & Production Technology
基金
中石油股份公司科技重大专项"塔中超深碳酸岩凝析气藏勘探开发关键技术"(编号:2014E-2106)
关键词
寒武系
含膏白云岩
实验
储层改造
cambrian
dolomite
gypsum
experiment
reservoir reconstruction
