沥青质堵塞储层水力脉冲波协同解吸机制

Mechanism of pluggings removal by hydraulic pulse wave assisted with desorption reagent in asphaltene plugged formation

以不同类型岩石矿物的沥青质吸附样品为研究对象,通过正交试验优化得到协同解吸工艺参数(解吸剂质量浓度、水力脉冲波量级、作用时间、解吸时间和脉冲频率),研究沥青质在不同岩石矿物表面的吸附行为和动力学机制以及水力脉冲波协同作用下解吸剂对沥青质在不同类型岩石矿物表面的协同解吸行为和动力学机制。结果表明:蒙脱石、绿泥石和高岭石控制着沥青质的吸附解吸过程,双常数速率方程和Elovich方程能够较好地反映水力脉冲波协同作用下的沥青质解吸过程;当解吸剂质量浓度较低时,水力脉冲波对解吸效果的促进作用相比高质量浓度时更为明显,协同作用初期解吸效果受到水力脉冲波的促进作用,整体而言其解吸效果仍为化学解吸剂所主导。

The adsorption model of asphaltene adsorbed on different kinds of minerals was investigated. And the technical parameters of the hydraulic pulse wave assisted with the desorption reagent were optimized by the orthogonal test (desorption reagent concentration, magnitude of the hydraulic pulse wave, action time, desorption time and pulse frequency). Based on the optimum technical parameters, the adsorption behavior and the kinetics of asphaltene adsorbed on different kinds of minerals, and the desorption behavior and the kinetics of the hydraulic pulse wave assisted with the desorption reagent were studied. The results show that the montmorillonite, chlorite and kaolinite control the adsorption-desorption process of asphaltene. The double constant rate equation and Elovich equation reflect the process of hydraulic pulse wave assisted with desorption reagent well. Compared with the higher concentration of the desorption reagent, the anxo-action of the hydraulic pulse wave are significant under the lower concentration of the desorption reagent. During the early period of the synergistic action by the hydraulic pulse wave and the desorption reagent, desorption effects are promoted by the hydraulic pulse wave, however, the overall effects are dominated by the chemical desorption agent.