Optimization of Agent Formula of Plugging While Drilling for High Permeability Formation in Tuoputai Block
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摘要: 托普台区块上部地层以砂泥岩层、砾质砂岩为主,容易发生漏点不明确、漏失段长的高渗透性漏失。通过对堵漏材料的配伍性评价及合理级配,优选出了一种适合高渗透性漏失地层的随钻堵漏剂。该堵漏剂对钻井液流变性影响小,可降低钻井液API滤失量,对沙床封堵后承压能力>10 MPa,在TP328X井的应用表明,高强度弹性石墨颗粒复合凝胶堵漏对于高压差、高渗透漏失的工况,可以有效封堵漏层,特别适用于对于漏层不明、漏涌同层、裸眼等复杂井况。Abstract: In Tuoputai Area, the upper formations are mainly composed of sand-shale layer and conglomerate sandstone, long segment and high permeability loss easily occurs with unclear loss layer.Based on the evaluation on plugging material compatibility and reasonable gradation, a plugging agent used in drilling was optimized, it is suitable for high permeability loss zone with less influence on the rheological property of drilling fluid, can reduce the amount of API drilling fluid filtra-tion and has bearing capacity of more than 10MPa after sand bed sealing.It is showed in well TP328X that high strength e-lastic graphite particle composite gel has effective sealing effects in high pressure difference and high permeability leakage conditions and is especially suitable for complex well conditions such as unclear leakage layer, well kicking accompanied with circulation loss and open hole.
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