抗高温无固相可循坏微泡沫钻井液技术研究与应用
发布时间:2018-11-15 22:29
【摘要】:随着辽河油田勘探开发程度的深入,许多低压低渗油气藏逐渐被开发;同时由于进入开发后期,地层亏空严重,钻进时极易发生严重漏失,不仅损害储层,还严重影响了钻井施工进度;长城钻探工程院开发的可循环微泡沫钻井液在一定程度上解决了在低压易漏失地层遇到的严重漏失问题,并很好地保护了油气层,具有很高的经济效益和社会效益。在茨采、沈采的潜山裂缝性油藏中,为保护储层,使用无固相水基可循环微泡沫体系,但现场应用表明:潜山储层一般埋藏较深,地层温度高,原微泡沫体系稳定性达不到要求。针对辽河油田之前应用的无固相可循环微泡沫稳泡剂抗温能力不够,在深井高温条件下,稳泡剂、发泡剂降解速度加快,稳泡时间短、增粘降滤失剂降失水效果不理想、抗温性能不强等实际问题,筛选出了可抗150℃高温的发泡剂、稳泡剂、与之匹配的降滤失剂,并对配方进行调整,使其具有合理的钻井液流变性能和抗温性能,稳泡时间从原来的0.5h提高到3h,滤失量从原来的15mL降至5mL,钻井液密度降低到0.90g/cm3时,泥浆泵上水正常、仪器信号正常。抗高温无固相可循环微泡沫钻井液的研发解决了泡沫稳定性问题、钻井泵上水问题、潜山深层裂缝性油气藏井漏问题,扩大了微泡沫钻井液应用范围,前景广阔。
[Abstract]:With the development of Liaohe Oilfield, many low pressure and low permeability reservoirs have been developed. At the same time, because of the serious formation deficit in the late stage of development, it is easy to occur serious leakage during drilling, which not only damages the reservoir, but also seriously affects the drilling construction progress. The circulating microfoam drilling fluid developed by the Great Wall drilling Engineering Institute solves the serious leakage problem in low pressure and easy to lose formation to some extent, and protects oil and gas reservoir well, which has high economic and social benefits. In order to protect the reservoir in the fractured buried hill reservoirs produced in ci and Shen, no solid phase water based circulating microfoam system is used. However, the field application shows that the buried hill reservoirs are generally buried deep and the formation temperature is high. The stability of the original microfoam system could not meet the requirements. In Liaohe Oilfield, the temperature resistance of the non-solid circulating microfoam foam stabilizer is not enough. Under the conditions of high temperature in deep wells, the degradation rate of foam stabilizer and foaming agent is accelerated, the time of foam stabilization is short, and the effect of viscosity and filtration loss agent on reducing water loss is not ideal. Some practical problems, such as low temperature resistance, were used to screen foaming agent, foaming stabilizer and matching filter reducer, which could resist 150 鈩,
本文编号:2334584
[Abstract]:With the development of Liaohe Oilfield, many low pressure and low permeability reservoirs have been developed. At the same time, because of the serious formation deficit in the late stage of development, it is easy to occur serious leakage during drilling, which not only damages the reservoir, but also seriously affects the drilling construction progress. The circulating microfoam drilling fluid developed by the Great Wall drilling Engineering Institute solves the serious leakage problem in low pressure and easy to lose formation to some extent, and protects oil and gas reservoir well, which has high economic and social benefits. In order to protect the reservoir in the fractured buried hill reservoirs produced in ci and Shen, no solid phase water based circulating microfoam system is used. However, the field application shows that the buried hill reservoirs are generally buried deep and the formation temperature is high. The stability of the original microfoam system could not meet the requirements. In Liaohe Oilfield, the temperature resistance of the non-solid circulating microfoam foam stabilizer is not enough. Under the conditions of high temperature in deep wells, the degradation rate of foam stabilizer and foaming agent is accelerated, the time of foam stabilization is short, and the effect of viscosity and filtration loss agent on reducing water loss is not ideal. Some practical problems, such as low temperature resistance, were used to screen foaming agent, foaming stabilizer and matching filter reducer, which could resist 150 鈩,
本文编号:2334584
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