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Pore Pressure Prediction and Its Relationship with Rock Strength Parameters and Weight on Bit in Carbonate Reservoirs (A Case Study, South Pars Gas Field)
Arabian Journal for Science and Engineering ( IF 2.6 ) Pub Date : 2021-01-20 , DOI: 10.1007/s13369-020-05284-x
Reza Khoshnevis-zadeh , Alireza Hajian , Ehsan Larki

Accurate pore pressure knowledge is particularly critical in drilling, such as drilling safety (avoidance of blowouts and well control lost-time incidents). Pore pressure prediction in carbonate reservoir due to the fact that the pore system and fractures are more complex than the clastic reservoir, also the effectiveness of pore pressure on drilling parameters like weight on bit that has direct effects on drilling rate is very important. As well as, the pore pressure and rock strength parameters have a special place in geomechanical studies. In this study, pore pressure was calculated using the porosity and effective stress in the carbonate reservoir. The porosity was calculated with three methods: neutron–density, neutron–sonic and sonic. The rock strength parameters (Bulk and Shear modulus) were calculated using P and S waves obtained from dipole shear sonic imager log. The calculated pore pressure was compared with modular formation dynamics tester (MDT), WOB and rock strength parameters. The result of the study showed that among available methods, predicted pore pressure with sonic porosity has the best matched to MDT data. Moreover, pore pressure has an inverse relationship to WOB and rock strength parameters, so that with increasing pore pressure of both WOB and rock strength parameters were decreasing. The comparison among predicted pore pressure, mud weight and MDT data was showing that the predicted pore pressure has high accuracy and can use it for geomechanical studies and having a safe drilling operation.



中文翻译:

碳酸盐岩储层孔隙压力预测及其与岩石强度参数和钻头重量的关系(以南帕尔斯气田为例)

准确的孔隙压力知识在钻探中尤其重要,例如钻探安全性(避免井喷和井眼控制损失的时间事件)。碳酸盐岩储层的孔隙压力和裂缝比碎屑储层更为复杂,因此预测碳酸盐岩储层的孔隙压力,孔隙压力对直接影响钻速的钻探参数(如钻压)的有效性也非常重要。而且,孔隙压力和岩石强度参数在岩土力学研究中具有特殊的地位。在这项研究中,利用碳酸盐岩储层中的孔隙度和有效应力来计算孔隙压力。用三种方法计算孔隙率:中子密度,中子声波和声波。使用从偶极剪切声波成像仪测井获得的P和S波计算岩石强度参数(体积和剪切模量)。将计算出的孔隙压力与模块化地层动力学测试仪(MDT),WOB和岩石强度参数进行了比较。研究结果表明,在可用方法中,具有声波孔隙度的预测孔隙压力与MDT数据最匹配。而且,孔隙压力与WOB和岩石强度参数成反比关系,因此随着孔隙压力的增加,WOB和岩石强度参数都在减小。预测的孔隙压力,泥浆重量和MDT数据之间的比较表明,预测的孔隙压力具有较高的准确度,可用于地质力学研究并具有安全的钻井作业。将计算出的孔隙压力与模块化地层动力学测试仪(MDT),WOB和岩石强度参数进行了比较。研究结果表明,在可用方法中,具有声波孔隙度的预测孔隙压力与MDT数据最匹配。而且,孔隙压力与WOB和岩石强度参数成反比关系,因此随着孔隙压力的增加,WOB和岩石强度参数都在减小。预测的孔隙压力,泥浆重量和MDT数据之间的比较表明,预测的孔隙压力具有较高的准确度,可用于地质力学研究并具有安全的钻井作业。将计算出的孔隙压力与模块化地层动力学测试仪(MDT),WOB和岩石强度参数进行了比较。研究结果表明,在可用方法中,具有声波孔隙度的预测孔隙压力与MDT数据最匹配。而且,孔隙压力与WOB和岩石强度参数成反比关系,因此随着孔隙压力的增加,WOB和岩石强度参数都在减小。预测的孔隙压力,泥浆重量和MDT数据之间的比较表明,预测的孔隙压力具有较高的准确度,可用于地质力学研究并具有安全的钻井作业。具有声波孔隙度的预测孔隙压力与MDT数据最匹配。而且,孔隙压力与WOB和岩石强度参数成反比关系,因此随着孔隙压力的增加,WOB和岩石强度参数都在减小。预测的孔隙压力,泥浆重量和MDT数据之间的比较表明,预测的孔隙压力具有较高的准确度,可用于地质力学研究并具有安全的钻井作业。具有声波孔隙度的预测孔隙压力与MDT数据最匹配。而且,孔隙压力与WOB和岩石强度参数成反比关系,因此随着孔隙压力的增加,WOB和岩石强度参数都在减小。预测的孔隙压力,泥浆重量和MDT数据之间的比较表明,预测的孔隙压力具有较高的准确度,可用于地质力学研究并具有安全的钻井作业。

更新日期:2021-01-20
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