Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Study on the Mechanism of Nanoemulsion Removal of Water Locking Damage and Compatibility of Working Fluids in Tight Sandstone Reservoirs
ACS Omega ( IF 3.7 ) Pub Date : 2020-02-05 , DOI: 10.1021/acsomega.9b03744 Jie Wang 1, 2 , Yafei Li 1, 2 , Fujian Zhou 1, 2 , Erdong Yao 1, 2 , Le Zhang 1, 2 , Hong Yang 3
ACS Omega ( IF 3.7 ) Pub Date : 2020-02-05 , DOI: 10.1021/acsomega.9b03744 Jie Wang 1, 2 , Yafei Li 1, 2 , Fujian Zhou 1, 2 , Erdong Yao 1, 2 , Le Zhang 1, 2 , Hong Yang 3
Affiliation
|
The invasion of external fluids, because of hydraulic fracturing for tight sandstone gas reservoirs, will cause the decrease of fracture conductivity and rock matrix permeability and decrease the flow of oil and gas. The nanoemulsion has a smaller molecular size and is used in combination with the fracturing fluid. After entering the formation, it can reduce the surface tension of gas/water, change the wettability of the rock surface, and improve the flowback rate of the fracturing fluid. In this study, a set of systematic evaluation methods was established in the laboratory to evaluate the mechanism and effect of removal of water locking additive in tight sandstone gas reservoirs. The adsorption experimental results of the nanoemulsion on the rock surface show that the adsorption of the nanoemulsion on the solid-phase particle surface is from strong to weak in the order of smectite, kaolinite, DB105X well rock powder, quartz sand, illite, chlorite, and ceramsite proppant. The experiment on the influence of the nanoemulsion on the spontaneous imbibition of reservoir rocks shows that when the gas permeability of reservoir rocks is Kg < 5.0 mD, adding a nanofluid in the working fluid to change the wettability of reservoir rocks can effectively reduce the imbibition and retention of external fluids in reservoir rocks, thus reducing the “water locking damage”. When the gas permeability of reservoir rocks is 5.0 mD < Kg ≤ 1.0 D, the effect of changing the reservoir wettability to prevent the “water locking damage” is reduced. At the same time, the nanoemulsion has good compatibility with different types of fracturing fluid and is beneficial for improving the flowback rate.
中文翻译：
致密砂岩油藏纳米乳液去除锁水伤害及工作流体相容性的研究
由于致密砂岩气藏的水力压裂，外部流体的侵入将导致裂缝导流能力和岩体渗透率的降低，并减少油气的流动。纳米乳液具有较小的分子尺寸，并且与压裂液组合使用。进入地层后，它可以降低气/水的表面张力，改变岩石表面的润湿性，并提高压裂液的返排率。在这项研究中，在实验室中建立了一套系统的评估方法，以评估致密砂岩气藏中止水添加剂的去除机理和效果。纳米乳剂在岩石表面的吸附实验结果表明，纳米乳剂在蒙脱石，高岭石，DB105X井岩粉，石英砂，伊利石，绿泥石，和陶粒支撑剂。对纳米乳液对储集岩自发吸收的影响的实验表明，当储集岩的透气度为K g <5.0 mD，在工作流体中添加纳米流体以改变储层岩石的润湿性可以有效地减少外部流体在储层岩石中的吸收和滞留，从而减少“水锁破坏”。当储集岩的气体渗透性是5.0毫达西< ķ克≤1.0 d，改变润湿性贮存器，以防止“水锁定损害”的效果降低。同时，纳米乳液与不同类型的压裂液具有良好的相容性，有利于提高返排率。
更新日期：2020-02-18
中文翻译：
致密砂岩油藏纳米乳液去除锁水伤害及工作流体相容性的研究
由于致密砂岩气藏的水力压裂，外部流体的侵入将导致裂缝导流能力和岩体渗透率的降低，并减少油气的流动。纳米乳液具有较小的分子尺寸，并且与压裂液组合使用。进入地层后，它可以降低气/水的表面张力，改变岩石表面的润湿性，并提高压裂液的返排率。在这项研究中，在实验室中建立了一套系统的评估方法，以评估致密砂岩气藏中止水添加剂的去除机理和效果。纳米乳剂在岩石表面的吸附实验结果表明，纳米乳剂在蒙脱石，高岭石，DB105X井岩粉，石英砂，伊利石，绿泥石，和陶粒支撑剂。对纳米乳液对储集岩自发吸收的影响的实验表明，当储集岩的透气度为K g <5.0 mD，在工作流体中添加纳米流体以改变储层岩石的润湿性可以有效地减少外部流体在储层岩石中的吸收和滞留，从而减少“水锁破坏”。当储集岩的气体渗透性是5.0毫达西< ķ克≤1.0 d，改变润湿性贮存器，以防止“水锁定损害”的效果降低。同时，纳米乳液与不同类型的压裂液具有良好的相容性，有利于提高返排率。
京公网安备 11010802027423号