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油气储集层具有应力敏感性,以往研究多关注于孔隙型储层和裂缝型储层的应力敏感性,而缝洞型储层的应力敏感性研究鲜见报道。以塔河油田裂缝—孔洞型碳酸盐岩储层为对象,选取天然缝岩样、人工缝岩样、单孔洞岩样和双孔洞岩样,开展应力敏感性实验研究。研究区选取的4组12块岩样的实验结果表明,天然缝岩样、人工缝岩样、单孔洞岩样及双孔洞岩样应力敏感系数分别为0.64、0.75、0.58和0.61,应力敏感程度分别为中偏强、强、中偏强及中偏强。岩样卸载60h后,渗透率最终恢复率分别为69.84%、4.36%、11.86%和38.75%。研究表明,孔洞的存在弱化了裂缝岩样应力敏感程度。孔洞的发育又增加了钻井完井液漏失损害的控制难度。
Oil and gas reservoirs are stress sensitive. In the past, research focused on the stress sensitivity of porous reservoirs and fractured reservoirs. However, the research on stress sensitivity of fractured reservoirs has rarely been reported. Based on the fractured-hole carbonate reservoirs in Tahe Oilfield, we selected natural rock samples, artificial rock samples, single-hole cave samples and double-hole cave samples for stress sensitivity experiments. The experimental results of 12 sets of 4 samples selected from the study area show that the stress sensitivity coefficients of natural sliver, artificial sliver, single hole and double hole are 0.64,0.75,0.58 and 0.61 respectively, and the stress sensitivity Respectively in the partial strong, strong, moderate and strong in the middle. After rock samples were unloaded for 60h, the final recovery rates of permeability were 69.84%, 4.36%, 11.86% and 38.75% respectively. The research shows that the existence of holes weakens the stress sensitivity of cracked rock samples. The development of the hole also increases the control difficulty of the loss of drilling and completion fluid.