高强度耐高温化学固结堵漏剂HDL1的研制及应用

摘要

In order to effectively seal fractured thief zone ,and avoid poor plugging effect caused by par-ticle size match error ,chemical consolidation plugging agent HDL 1 has been developed with features of high strength and high temperature resistance .In view of shortcomings of conventional consolidation plug-ging agents such as poor resistance to high temperature and low density adjustability ,the authors selected positron bonding material ,chemical coagulant ,reology control material ,triggering material and density modifiers after extensive laboratory tests on retention ability ,consolidation time ,strength and density ,de-termined the optimal proportion of these materials ,and developed the chemical consolidation plugging agent HDL 1 .The plugging agent HDL 1 had advantages such as adjustable thickening time(4 12 h) ,adjustable density(1.3 1.9 g/cm3 ) ,and high pressure bearing capacity (48 h strength>17 MPa) .The chemical con-solidation plugging agent has been successfully applied to improve the formation bearing capacity by 8.2 M Pa for Well SX2 Permian fractured thief zone in Tahe Oilfield ,resulting in satisfactory drilling results . The chemical consolidation plugging agent HDL 1 could effectively seal fractured thief zone ,which provid-ed technical support for the sealing of Permian igneous leakage zones .%为有效封堵裂缝性漏失层，避免由颗粒材料粒径级配误差造成的堵漏效果差的问题，研制了高强度耐高温化学固结堵漏剂。针对常用固结类堵漏材料耐温性差、密度不易调整的缺点，从滞留能力、固结时间、强度、密度等方面入手，通过优选正电黏结剂、化学凝固剂、流变性调控剂、引发剂和密度调节剂，并确定合理的比例关系，研制出化学固结堵漏剂HDL 1。用HDL 1配制的化学固结堵漏浆具有稠化时间可调（4～12 h）、密度可调（1.3～1.9 g/cm3）、承压能力较强（48 h强度可达17 M Pa以上）的特点。该化学固结堵漏剂在SX2井的二叠系火成岩裂缝性漏失层进行了试验应用，应用后地层承压能力提高8.2 M Pa ，满足了正常钻井施工的需求。现场试验表明，HDL 1可有效封堵裂缝性漏失层，确保易漏地层安全钻进。