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本文提出了一种NMR测-注-测方法(NMRLIL)来估算多种探测深度时碳酸盐岩井的渗透率和残余油饱和度。以前的方法都是关于怎样利用NMR确定剩余油的,本文的方法包括取心和NMR测井两步操作,接着用加入添加剂的泥浆通过套管下扩孔再利用低频、高频MRIL仪重新测井。NMR取心测量已用于改进测井解释。 本文的方法包括用MnCl_2加入泥浆前、后的NMR测井。顺磁离子(Mn~(++))使得水信号衰减更快,从而可以识别并测得到油信号。泥浆中加入添加剂后,井孔被扩大以保证有大量的添加剂在重新测井之前侵入到地层中。通过对比加入添加剂前后井的NMR测井曲线产生剩余和/或残余油饱和度剖面。 在一口井中用NUMAR的MRIL和斯仑贝谢的CMR两种测井仪器进行测井,两种测井结果除不规则井段外是一致的。 用双探测深度的MRIL仪确定泥浆滤液侵入范围以及被测得的是否是剩余和/或残余油饱和度。在该井的上段,低频(探测深度较大)仪比高频仪显示的剩余油饱和度值要高,两者的差异随探测深度的增加而增至零。 本文给出的新方法已在得克萨斯的两口井得到了应用,用来评价CO_2先导性试验方案在白云岩地层的可行性,已设计了第三口井。
This paper presents a NMR NMR-NMT method to estimate the permeability and residual oil saturation of carbonate wells at various exploration depths. The previous methods were all about how to use NMR to determine the remaining oil. The method in this paper consists of a two-step coring and NMR logging procedure, followed by reaming with a slurry containing additives through a cannula and then using a low frequency, high frequency MRIL instrument well. NMR coring measurements have been used to improve logging interpretation. The method in this paper includes NMR logging before and after the addition of MnCl 2 to the mud. Paramagnetic ions (Mn ~ (++)) make the water signal decay faster, which can identify and measure the oil signal. After adding the additive to the mud, the borehole is enlarged to ensure that a large amount of additive intrudes into the formation before re-logging. Residual and / or residual oil saturation profiles were generated by comparing well logs before and after the addition of additives. Logging was performed in one well using MRUM from NUMAR and CMR from Schlumberger, and the results for both logs were consistent except for the irregular intervals. A dual probe depth MRIL instrument was used to determine mud filtrate intrusion range and whether residual and / or residual oil saturation was measured. In the upper section of the well, the lower frequency (greater depth of investigation) is higher than the remaining oil saturation shown by the HF instrument, and the difference between the two increases to zero as the depth of investigation increases. The new method presented in this paper has been applied to two wells in Texas to evaluate the feasibility of a CO 2 pilot scheme in the dolomite formation and a third well has been designed.