不同发泡剂对抽采钻孔护孔泡沫混凝土性能的影响研究
tudy on Influence of Different Foaming Agents on Properties of Foamed Concrete for Extraction Drilling
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摘要: 为了解决松软煤层内钻孔易塌孔的问题,提出一种钻孔内利用泡沫混凝土支护孔壁,防止钻孔塌孔的新方法。选取铝粉、碳酸氢钠和双氧水为试验发泡剂制备了不同的样品,然后从孔隙率、抗压强度和发热量3个角度考察样品的适用性。结果表明:以铝粉为发泡剂制备的样品孔隙率达47.84%,以双氧水为发泡剂制备的样品孔隙率达43.27%,以碳酸氢钠为发泡剂制备的样品孔隙率达17.36%;以碳酸氢钠为发泡剂制备的样品抗压强度最高,达到2.41 MPa,以双氧水为发泡剂制备的样品的3 d抗压强度为1.98 MPa,以铝粉为发泡剂制备的样品的3 d抗压强度为1.47 MPa,3种样品3 d的抗压强度均超过1 MPa,基本满足钻孔内支护孔壁的需求;铝粉发泡过程中,浆液温度从19.3 ℃上升到36.4 ℃,不能满足井下使用要求;双氧水最适宜作为钻孔护孔泡沫混凝土发泡剂的使用。Abstract: To solve the problem of easy collapse hole in soft coal seam, a new method of using foam concrete to support hole wall in borehole to prevent drilling collapse is proposed. Different samples were prepared by selecting aluminum powder, sodium bicarbonate and hydrogen peroxide as test foaming agents, and then the applicability of the samples was investigated from three angles of porosity, compressive strength and heat. The results showed that: the porosity of samples prepared with aluminum powder as foaming agent was 47.84%, the porosity of samples prepared with hydrogen peroxide as foaming agent was 43.27%, the porosity of samples prepared with sodium bicarbonate as foaming agent was 17.36%, and the highest compressive strength of samples prepared with sodium bicarbonate as foaming agent was 2.41 MPa, the 3-day compressive strength of the sample prepared with hydrogen peroxide as foaming agent was 1.98 MPa, the compressive strength of the 3 sample prepared with aluminum powder as foaming agent was 1.47 MPa, the compressive strength of three samples was more than 1 MPa for 3 days, and the requirement of supporting hole wall in the borehole was basically satisfied, and during the foaming process of aluminum powder, the slurry temperature rises from 19.3 ℃ to 36.4 ℃,which can not meet the requirements of downhole use; hydrogen peroxide is most suitable as the use of drilling hole foam concrete foaming agent.
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Keywords:
- coal mine disaster /
- gas control /
- pumping drilling /
- drilling hole protection /
- foam concrete
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