摘要
分析了钻井液pH值的维护现状及引起其波动的因素,讨论了钻井液pH值大干12或小于8时的危害。得出,在钻井液的维护处理过程中,为了提高pH值需要及时补充NaOH,但由于NaOH不能瞬间均匀地分散,NaOH引起局部钻屑的强分散及处理剂在高碱性下发生化学反应而失效。指出,在高温、高矿化度条件下不宜采用加入NaOH的办法提高pH值,否则加碱越多,pH值下降越厉害,钻井液性能越不稳定;加入烷基磺酸钠AS、失水山梨醇单油酸脂SP-80、烷基酚与环氧乙烷缩合物OP-10等表面活性剂可缓解钻井液pH值的下降,但仍有一定的局限性,因此迫切需要一种pH值缓冲剂。
This paper analyzed the factors affecting the pH values of drilling fluids,and discussed the negative effects of the pH values greater than 12 of less than 8.It was concluded that the caustic soda(NaOH)should be added promptly in increasing the pH values of drilling fluids.The concentration of the NaOH added in the mud caused a severe dispersion of drilled cuttings locally and the malfunction of the mud additives.At high temperatures and high salinity NaOH is not suitable for use in increase the pH values of drilling fluids;the more the NaOH is add- ed,the faster the pH values are reduced,and the worse the stability of the drilling fluid property is.Some surfac- rants,such as AS,SP-80 and OP-10,can be used in minimizing the reduction of the pH values of the drilling flu- ids,but with some limitations.Drilling fluids are nor crying for a new pH buffer.
出处
《钻井液与完井液》
CAS
北大核心
2008年第3期77-78,共2页
Drilling Fluid & Completion Fluid
关键词
钻井液
钻井液性能pH值
性能维护
Drilling fluids
Drilling fluid performance
pH values
Function maintenance
