高密度水基钻井液在小井眼水平井中的应用
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摘要
狮49H1井位于青海油田柴达木盆地英西地区狮49井区,钻探目的是为了提高狮49井区背斜构造部位产能,扩展E_3~2-V油组产能规模,进一步了解狮子沟油田E_3~2油藏油气富集规律,为储量计算提供参数。三开储层井段优选BHWEI钻井液体系,解决了钻井液在小井眼高密度条件下环空压耗大、悬浮稳定性、流变性、窄窗口、抗污染能力难以控制、井控风险高等难题。完钻井井壁稳定,平均井径为159.88 mm,井径扩大率为4.9%。应用钻井液密度为2.10 g/cm~3,创英西区块水平井使用钻井液密度最高记录,水平段钻进无托压现象,起下钻无阻卡,完井作业顺利,该井获高产工业油流,体系具有良好的储层保护特性。
The well Shi-49 H1, located in the block Shi-49 in Yingxi area, Qaidam Basin, Qinghai Oilfield, was drilled to enhance the productivity of the anticline structure of the block, especially the productivity of the E_3~2-V reservoir group, and to further understand the oil and gas enrichment patterns of the E_3~2 reservoir of the Shizigou. Well test data will be used to calculate reserves of the oilfield.A BH-WEI drilling fluid was used to drill the third interval, a slim hole section in which the use of high density drilling fluid resulted in downhole problems such as high annular pressure loss, rheology control, narrow drilling window, contamination to the drilling fluid,and high risk of well control etc. These problems have been successfully addressed partially because of the use of the BH-WEI drilling fluid. Average hole size was 159.88 mm, with percent hole enlargement of only 4.9%, indicating that the borehole wall was stabilized by the drilling fluid. The density of the drilling fluid was 2.10 g/cm~3, the highest density that has ever been used in horizontal drilling in Yingxi area. No hindrance to exerting pressure on bit has ever been encountered during horizontal drilling. Tripping of the drilling string was conducted smoothly. The well was successfully completed. A high industrial oil production rate was acquired, as determined by well test, indicating that the BH-WEI mud has good reservoir protecting ability.
The well Shi-49 H1, located in the block Shi-49 in Yingxi area, Qaidam Basin, Qinghai Oilfield, was drilled to enhance the productivity of the anticline structure of the block, especially the productivity of the E_3~2-V reservoir group, and to further understand the oil and gas enrichment patterns of the E_3~2 reservoir of the Shizigou. Well test data will be used to calculate reserves of the oilfield.A BH-WEI drilling fluid was used to drill the third interval, a slim hole section in which the use of high density drilling fluid resulted in downhole problems such as high annular pressure loss, rheology control, narrow drilling window, contamination to the drilling fluid,and high risk of well control etc. These problems have been successfully addressed partially because of the use of the BH-WEI drilling fluid. Average hole size was 159.88 mm, with percent hole enlargement of only 4.9%, indicating that the borehole wall was stabilized by the drilling fluid. The density of the drilling fluid was 2.10 g/cm~3, the highest density that has ever been used in horizontal drilling in Yingxi area. No hindrance to exerting pressure on bit has ever been encountered during horizontal drilling. Tripping of the drilling string was conducted smoothly. The well was successfully completed. A high industrial oil production rate was acquired, as determined by well test, indicating that the BH-WEI mud has good reservoir protecting ability.
引文
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