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孤东油田七区西油藏埋藏浅 ,储集层胶结疏松、渗透率高 ,粒度多为正韵律分布 ,在注水开发过程中出砂严重 ,特别是实施强注强采方案后出砂程度加剧 ,一些井间形成了特高渗透带 (即大孔道 )。采用实验模拟方法研究了大孔道形成的机理和影响因素 (油层渗透率、岩石胶结程度、流体黏度、开采速率 )。由于用示踪剂诊断大孔道不经济 ,所以提出了利用生产数据诊断、描述大孔道的方法。用灰色理论计算各种因素间的相关关系 ,以诊断大孔道的存在 ;并利用简化的数学模型 ,计算大孔道参数(方向、厚度、渗透率、孔喉尺寸等 )。编制了具有以上功能的软件 ,利用该软件解释孤东油田七区西油藏 42井组单元的油、水井 2 90井次 ,诊断出 1 2 4口井存在大孔道 ,与实验区块示踪剂实验结果吻合。图 1表 1参 8
Gudong reservoir in Block G of Gudong Oilfield is shallow buried with loosely cemented and highly permeable reservoirs with mostly positive rhythm distribution and serious sand production during the development of water injection. In particular, , Some of the wells formed ultra-high permeability zone (ie, large pore). The mechanism of formation of macropores and influencing factors (reservoir permeability, rock cementation, fluid viscosity and extraction rate) were studied by experimental simulation. Due to the uneconomical diagnosis of large pores with tracers, a method of diagnosing and describing large pores using production data is proposed. The gray theory is used to calculate the correlation between various factors in order to diagnose the existence of large pores. The simplified mathematical model is used to calculate the parameters of large pores (orientation, thickness, permeability, pore throat size, etc.). The software with the above functions was compiled and the software was used to explain the oil well and water well of Unit 42 of West Block of Block 7 in Gudong Oilfield. There are 2 90 wells, and large holes were found in 124 wells, The experimental results agree. Figure 1 Table 1 Reference 8