绒囊流体在单一煤层气藏和致密砂岩气藏等非常规储层的工程作业效果和储层伤害控制效果皆满足现场要求，但由于没有合适的评价方法，室内仍缺乏对合采储层的整体伤害试验评价应用于煤系合采地层。室内试验利用可分别计量单层和多层合采流量、压力的储层伤害评价系统，模拟临兴煤系储层压力及温度条件，选用下石盒子组致密砂岩及太原组煤岩共7枚，采用气体恒流量法，测试砂/煤单层开采模式、“砂+煤”双层合采模式及“砂+砂+煤”三层合采模式共4组试验。试验记录各层单采及多层合采伤害前后稳定时的流量共7组，稳定时的进出口压力共14组，利用达西定律计算得出7组渗透率数据，以此作为基础数据，对比流量法评价绒囊钻完井流体造成的储层整体伤害程度。试验结果表明：①砂、煤单层开采时，稳定流量损害率分别为7.96%和7.91%，接近渗透率损害率的8.48%和8.55%；②双层合采时，合采稳定流量损害率为7.24%，整体渗透率损害率不能计算，单层渗透率损害率分别为7.24%和7.81%；③三层合采时，合采稳定流量损害率为8.83%，整体渗透率损害率不能计算，单层渗透率损害率分别为6.48%、11.97%及9.68%。结论认为，室内用流量法评价绒囊钻完井流体多层合采储层整体伤害率满足现场控制伤害要求，且同时印证了流量法可替代渗透率法评价工作液储层伤害程度，并为现场优选技术应用提供了新的评价方法。

The engineering operation effect and reservoir damage control effect of fuzzy-ball in unconventional reservoirs such as single coalbed methane reservoirs and tight sandstone gas reservoirs all meet the field requirements.However,due to the lack of appropriate evaluation methods, the laboratory still lacks the formation damage test evaluation to the combined production reservoir, which is applied to the coal-measure combined mining formation.The laboratory test uses a reservoir damage evaluation system that can separately measure the flow and pressure of single-layer and multi-layer combined mining to simulate the pressure and temperature conditions of the Linxing coal-measure reservoir. A total of seven sandstones in the Shihezi Formation and Taiyuan Formation are selected.  Adopting the gas constant flow method to test four sets of tests in the sand/coal single-layer mining mode, the “sand + coal” double-layer combined mining mode, and the “sand + sand + coal” three-layer combined mining mode.The test records seven sets of stable flow rates before and after the damage of each layer of single mining and multi-layer combined mining, and 14 sets of inlet and outlet pressures when stable. seven sets of permeability data are calculated by Darcy′s law. which was used as the basic data. The comparative flow method is used to evaluate the overall damage degree of the reservoir caused by the fleece drilling and completion fluid. The test results show that:①When sand and coal are mined in a single layer,the steady flow damage rates are 7.96% and 7.91% respectively,which are close to 8.48% and 8.55% in the permeability damage rate.②In the case of double-layer mining,the stable overall flow damage rate is 7.24%.The overall permeability damage rate cannot be calculated, and the single-layer permeability damage rates are 7.24% and 7.81%,respectively.③When three layers are mined together,the overall flow damage rate is 8.83%,and the overall permeability damage rate cannot be calculated.The single layer permeability damage rate was 6.48%,11.97%,and 9.68% respectively.The results show that the indoor evaluation of formation damage results of Fuzzy-ball drilling and completion fluids in multi-layer co-production meets the requirements of of on-site damage control, and at the same time confirms that the flow method can replace the permeability method to evaluate the damage degree of working fluid reservoirs. The application of on-site optimization technology provides a new evaluation method.