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Proppant transport in fractures is essentially a dense granular flow in a slot-shaped space. Applying the two-fluid method in numerical simulations of a field-scale particle flow is promising, but existing solid stress models cannot accurately describe the process of proppant accumulation. In this paper, the morphological change of a proppant pack under flow erosion was analyzed experimentally, and the important influence of cohesion on the change of the pack state was pointed out. Then, combined with the simulated results of a proppant transport and the results of a suspension apparent viscosity test, the influence of the particle radial distribution function on the solid kinetic pressure and the change trend of total solid pressure were analyzed, and the change rate of the solid friction pressure with the particle volume fraction was determined. Based on the granular matter theory and results of a direct shear test, the cohesion of the proppant pack was considered in the frictional viscosity model. The results show that the improved solid friction stress model can capture larger angles of the accumulation and settlement profiles, and correctly simulate the process of proppant accumulation.
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缝内支撑剂运动属于狭长空间中的稠密颗粒流问题,两流体法在该类矿场尺度颗粒流的数值模拟研究上极具应用前景,但其现有的固相应力模型尚无法准确描述支撑剂堆积过程。本文通过实验分析了支撑剂堆积在液流冲刷下形态变化的物理过程,指出黏聚力对堆积状态改变的重要影响。在此基础上,结合支撑剂输送数值模拟和支撑剂悬浮液黏度测试结果,分析颗粒径向分布函数对固相运动压力的影响以及固相总压力变化趋势,确定固相摩擦压力随颗粒体积分数的变化速度;基于颗粒物质力学理论和支撑剂堆积直剪试验结果,将支撑剂堆积黏聚力考虑到固相摩擦黏度模型中。研究表明,改进后的固相摩擦应力模型能够捕捉更大的堆积剖面角和沉降剖面角,从而正确模拟支撑剂堆积过程。
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冲刷下支撑剂堆积轮廓演化过程, figureFileSmall=CyOg8b2ln8ViOKMHeXfR9g==, figureFileBig=aBDTHtcpndjkM/tsSGEsDg==, tableContent=null), ArticleFig(id=1243226235866825647, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Fig. 5, caption=
Comparison of simulations with different solid friction stress models, figureFileSmall=5kdSuASh4CDOTenhHSiXsA==, figureFileBig=GXt5UeDnOHuhHMc6O8ifYw==, tableContent=null), ArticleFig(id=1243226236286256055, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=图5, caption=
不同固相摩擦应力模型模拟结果对比, figureFileSmall=5kdSuASh4CDOTenhHSiXsA==, figureFileBig=GXt5UeDnOHuhHMc6O8ifYw==, tableContent=null), ArticleFig(id=1243226236743435201, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Fig. 6, caption=
Comparison of simulations with different cohesion, figureFileSmall=AR76fUPnszpdYGMm/rLWhg==, figureFileBig=1gwpBfTq0OTcCBxIzwxgNg==, tableContent=null), ArticleFig(id=1243226237041230788, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=图6, caption=
不同黏聚力模拟结果对比, figureFileSmall=AR76fUPnszpdYGMm/rLWhg==, figureFileBig=1gwpBfTq0OTcCBxIzwxgNg==, tableContent=null), ArticleFig(id=1243226237536158665, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Tab. 1, caption=
Numerical parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 取值 | 参数 | 取值 |
|---|
| 入口相速度 | 1.39 m•s-1 | 入口固相分数 | 6% |
| 入口颗粒温度 | 2e-2m2•s-2 | 初始固相湍流运动黏度 | 8e-9 m2•s-1 |
| 初始液相湍流运动黏度 | 1e-8m2•s-1 | 入口湍动能 | 3.75e-5J•m-3 |
| 入口湍流耗散率 | 1.5e-4J•(m3•s)-1 | 出口压力 | 1e5Pa |
| 液相密度 | 1027 kg•m-3 | 固相密度 | 2700 kg•m-3 |
| 颗粒粒径 | 3e-4m | 液相黏度 | 2.5 mPa•s |
| 颗粒-颗粒碰撞恢复系数 | 0.4 | 颗粒-壁面碰撞恢复系数 | 0.3 |
| 壁面反射系数 | 0.8 | 颗粒内摩擦角 | 30° |
), ArticleFig(id=1243226237842342865, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=表1, caption=
模拟参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 取值 | 参数 | 取值 |
|---|
| 入口相速度 | 1.39 m•s-1 | 入口固相分数 | 6% |
| 入口颗粒温度 | 2e-2m2•s-2 | 初始固相湍流运动黏度 | 8e-9 m2•s-1 |
| 初始液相湍流运动黏度 | 1e-8m2•s-1 | 入口湍动能 | 3.75e-5J•m-3 |
| 入口湍流耗散率 | 1.5e-4J•(m3•s)-1 | 出口压力 | 1e5Pa |
| 液相密度 | 1027 kg•m-3 | 固相密度 | 2700 kg•m-3 |
| 颗粒粒径 | 3e-4m | 液相黏度 | 2.5 mPa•s |
| 颗粒-颗粒碰撞恢复系数 | 0.4 | 颗粒-壁面碰撞恢复系数 | 0.3 |
| 壁面反射系数 | 0.8 | 颗粒内摩擦角 | 30° |
), ArticleFig(id=1243226238047863766, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Tab. 2, caption=
Commonly used g0 expressions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 文献 | g0具体表达式 |
|---|
| Ref. [15] |  |
| Ref. [16] |  |
| Ref. [17] |  |
| Ref. [18] |  |
| Ref. [19] |  |
| Ref. [20] |  |
), ArticleFig(id=1243226238219830233, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=表2, caption=
常用g0表达式
, figureFileSmall=null, figureFileBig=null, tableContent=
| 文献 | g0具体表达式 |
|---|
| Ref. [15] |  |
| Ref. [16] |  |
| Ref. [17] |  |
| Ref. [18] |  |
| Ref. [19] |  |
| Ref. [20] |  |
), ArticleFig(id=1243226238651843553, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Tab. 3, caption=
Expressions and characteristics of solid friction pressure and viscosity
, figureFileSmall=null, figureFileBig=null, tableContent=
| 固相摩擦压力和黏度表达式 | 特点 |
|---|
Ref. [14]: | 颗粒摩擦在αs,minFriction大于0.5后存在;固相摩擦黏度基于摩尔-库伦定律经验形式计算,内摩擦角为28.5°~30° |
Ref. [21]: | 固相摩擦压力增幅受到高估;引入应力张量第二不变量计算固相摩擦黏度 |
Ref. [18]: | 减缓了固相摩擦压力增幅;引入应力张量第二不变量计算固相摩擦黏度 |
Ref. [22]: | 堆积体在达到固相临界摩擦压力ps,fric后开始变形,n值决定了屈服面的形状;考虑了颗粒紧密接触、碰撞时应变率波动对固相摩擦黏度的影响;内摩擦角取28.5° |
Ref. [23]: | 通过固相临界体积分数αs,c(超过该值后固相压力仅为摩擦压力)细分固相临界摩擦压力ps,fric,其他与S-S模型一致;内摩擦角φ取40°、30°和10° |
), ArticleFig(id=1243226239067079659, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=表3, caption=
固相摩擦压力和黏度表达式及特点
, figureFileSmall=null, figureFileBig=null, tableContent=
| 固相摩擦压力和黏度表达式 | 特点 |
|---|
Ref. [14]: | 颗粒摩擦在αs,minFriction大于0.5后存在;固相摩擦黏度基于摩尔-库伦定律经验形式计算,内摩擦角为28.5°~30° |
Ref. [21]: | 固相摩擦压力增幅受到高估;引入应力张量第二不变量计算固相摩擦黏度 |
Ref. [18]: | 减缓了固相摩擦压力增幅;引入应力张量第二不变量计算固相摩擦黏度 |
Ref. [22]: | 堆积体在达到固相临界摩擦压力ps,fric后开始变形,n值决定了屈服面的形状;考虑了颗粒紧密接触、碰撞时应变率波动对固相摩擦黏度的影响;内摩擦角取28.5° |
Ref. [23]: | 通过固相临界体积分数αs,c(超过该值后固相压力仅为摩擦压力)细分固相临界摩擦压力ps,fric,其他与S-S模型一致;内摩擦角φ取40°、30°和10° |
), ArticleFig(id=1243226239385846768, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=EN, label=Tab. 4, caption=
Settings of different cases
, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 固相摩擦压力和黏度表达式 |
|---|
| Case 1 |  |
| Case 2 |  |
| Case 3 |  |
| Case 4 |  |
| Case 5 |  |
| Case 6 |  |
| Case 7 |  假设αs≥0.58时黏聚力起作用 |
| Case 8 |  假设αs≥0.58时黏聚力起作用 |
), ArticleFig(id=1243226239834637304, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226196402618603, language=CN, label=表4, caption=
模拟案例设置
, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 固相摩擦压力和黏度表达式 |
|---|
| Case 1 |  |
| Case 2 |  |
| Case 3 |  |
| Case 4 |  |
| Case 5 |  |
| Case 6 |  |
| Case 7 |  假设αs≥0.58时黏聚力起作用 |
| Case 8 |  假设αs≥0.58时黏聚力起作用 |
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