文南油田文72块S_3中油藏清防盐工艺技术

TECHNOLOGY OF SALT PREVENTMENT OF W72 S_3z FAULTED RESERVOIR IN WENNAN OILFIELD

文 72块S3 中油井盐垢的化学成分以Na+ 为主 ,含有少量的Ca2 + 、Mg2 + 、HCO-3 等离子。室内筛选FAP和KFN有机防盐剂 ,其作用机理是 :防盐剂具有 3个酰胺基 ,在溶液中 ,酰胺基团的—O—与Na+ 、—NHR+ 、Cl-相互吸引 ,改变NaCl晶核表面的电荷分布 ,破坏NaCl晶体的继续生长。防盐剂的作用表现在 :增大盐的溶解度和改变盐的结晶类型。通过室内研究和现场试验表明 ,化学防盐工艺简单 ,施工方便 ,成本低 。

Salt deposition is severe in oil wells in W72 S 3z faulted reservoir, and the composition of salt scale, and reason for formation of salt scale was discussed. Salt scale is composed of Na +, and a small proportion of Ca 2+ ,Mg 2+ and HCO 3 -.FAP and KFN organic scale inhibitor whose mechanism of salt prevent is to change the distribution of electric change on the surface of NaCl crystal, thus destroy the formation of crystal nucleus of NaCl, and prevent NaCl from crystallizing out of solution, by their three acyl- pedestal, O and Na +、NHR + and Cl -attract one another in solution. So, the main functions of salt prevention agent are to incriease solubility of NaCl and to change the crystallizing type of NaCl. Lab study and field test prove the technology is simple, conventient with low cost and good results.