摘要
油井水泥固有的收缩特性是诱发油气井气窜和造成水泥环胶结质量差的主要原因。研制了一种新型油井水泥膨胀剂（ Ｄ Ｂ） ，当掺量为水泥的３ ％ —８ ％ 时，可使水泥浆产生足够大的塑性膨胀及后期体积膨胀，并且其塑性强度发展高于净浆。膨胀量随养护温度的升高和养护龄期的延长而增大，在受限状态下能显著改善水泥石的抗压强度和胶结强度。 Ｄ Ｂ 膨胀剂与降滤失剂及分散剂的配伍性好，对水泥浆的其它工程性能无明显影响。结合实验结果讨论了该膨胀剂的作用机理。
A new expansive agent, Expandant DB, is developed for use in oilwell cementing to prevent gas channelling and poor bond quality. The expansion and performance properties of an oilwell cement slurry system with 0-8% DB added are determined and investigated in the course of setting at different conditions. It is shown that introducing 3-8% DB leads to expansion of the slurry system from fresh to hardened stages, significantly improves its compression and bonding strength under restrain conditions, and exerrts no negative effect on its performance properties. DB is well compatible with common cement additives. The expanding cement can be used in wells of temperature at least up to 80℃. The expansive mechanisms involved are acceleration of developing plastic strength and creation of crystal growth pressure by the reaction products of DB with cement hydrates and mixing water.
出处
《油田化学》
CAS
CSCD
北大核心
1999年第2期109-112,101,共5页
Oilfield Chemistry
关键词
油井水泥
水泥浆
膨胀剂
性能
DB型
固井泥浆
Oilwell Cement
Cement Slurry
Volume Shrinkage
Expansive Agent
Performance Properties
