微滤膜过滤法检测压裂液残渣含量的研究

Residue Detection of Fracturing Fluid by Microfiltration Membrane Filtration Method

刘红霞

LIU Hongxia

针对离心法检测压裂液残渣含量出现残渣颗粒分离界面不清、 清液无法完全傾出的问题， 提出用微滤膜滤法检测压裂液破胶后的残渣含量。通过用激光粒度仪对瓜尔胶和聚合物类压裂液破胶液残渣颗粒粒径的分析， 确定了微滤膜孔径， 研究了滤样量、 温度和压力对微滤膜通量的影响， 比较了微滤膜过滤法和离心法检测破胶液残渣含量的效果。结果表明， 微滤膜过滤法检测适合在常温 （30℃） 下进行。瓜尔胶系列压裂液破胶液残渣过滤的微滤膜孔径为 3 μm， 操作压力在 0.2～0.3 MPa宜， 瓜尔胶和瓜尔胶改性产品压裂液破胶液适宜的滤样量分别为 25和 50 mL； 聚合物类压裂液破胶液残渣过滤的微滤膜孔径为 0.22 μm， 操作压力为 0.1 MPa， 滤样量为150 mL。微滤膜过滤法实现了残渣颗粒从破胶液中的完全分离， 重现性和精密度好于离心法。图 3表 4参13

Aiming at the problem of centrifugation that the interface boundary of residue in fracturing fluid was not clear and the clear fluid could not be pour out completely， a microfiltration filtration method was proposed to measure the residue of broken-gel fluid. The residue particle size of guar gum and polymer broken-gel fluid was analyzed by laser particle size analyzer and the pore size of microfiltration membrane was determined. The influence of sample volume，temperature and pressure on flux of microfiltration membrane was researched. Finally， the effect of centrifugation and filtration method for detecting the residue in broken-gel fluid was compared. The experiment results showed that the detection temperature of filtration method was 30℃. The suitable residue filtration condition of broken-gel fluid for guar gum fracturing fluid was obtained as follows：3 μm pore size of microfiltration membrane， 0.2—0.3 MPa operating pressure， 25 and 50 mL sample volume for guar gum and modified guar gum respectively. And that for polymer fracturing fluid was obtained as follows：0.22 μm pore size of microfiltration membrane， 0.1 MPa operating pressure，150 mL sample volume. The residue was completely separated from broken-gel fluid by microfiltration membrane filtration method whose reproducibility and accuracy were better than those of centrifugation method.

10.19346/j.cnki.1000-4092.2018.01.031