低分子量合成聚合物压裂液研究  

Low Molecular Mass Synthetic Polymer Based Aqueous Crosslinking/Gelling Hydrofracturing Fluid

作　　者：管保山[1] 薛小佳[2] 何治武[2] 郭自新[2] 丁里[2] 刘静[2] 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]中国石油长庆油田分公司油气工艺技术研究院,陕西西安710021

出　　处：《油田化学》2006年第1期36-38,62,共4页Oilfield Chemistry

摘　　要：研发了以低分子量合成聚合物PY-1为稠化剂的交联冻胶压裂液。PY-1含有酰胺基团，增稠能力强，0．35％水溶液的黏度为27mPa·s。以可生成多核羟桥络离子的两性金属盐NT-2为交联剂。实验压裂液的基液为0．35％PY-1＋0．3％助交联剂＋0．3％防膨剂＋0．5％助排剂，交联液为1．5％NT-2＋0．15％交联协调剂，聚交比100：8。该压裂液在80℃、170s^-1剪切90分钟仍保持黏度～100mPa·s；在70℃、170s^-1剪切30和60分钟时，n′和K′值变化不很大；70℃滤失系数为8．35×10^-4m／min 1／2；70℃破胶后实测残渣含量仅22．7mg／L；加入0．06％APS后，70℃、1小时破胶液黏度2．65mPa·s：当地温为60-70℃时，APS的加量为0．06％～0．15％；破胶液表面张力25．14mN／m，界面张力2．54mN／m；破胶液对于标准黏土的防膨率为68．3％。简介了用PY-1压裂液在长庆低渗油田井深2000m、地温70℃的2口新井实施压裂的良好结果。图1表4参3。An aqueous crosslinking/gelling hydrofracturing fluid （CGHFF） based on low molecular mass synthetic polymer PY-1 is developed. Containing amide functionalities, PY-1 has strong thickening ability in water, the apparent viscosity of 0.35% aqueous solution being of 27 mPa·s. The erosslinker used is an arnphoteric metal salt, NT-2, capable of forming polynuelear olation complex ion. The experimental CGHFF is prepared from a base solution, 0.35%PY-1 ＋ 0.3% crosslinking aid ＋ 0.3% antisweller ＋ 0.5% flow back aid, and a crosslinking solution, 1.5 % NT-2 ＋ 0.15 % erosslinking synergist, in ratio 100 ： 8. This CGHFF is evaluated for performance properties and following characteristics are obtained： viscosity after shearing at 80℃ and 170 s^-1 in 90 min-00 mPa·s; relatively small changes in n′ and K′ values after shearing at 70℃ and 170 s^- 1 in 30 and 60 min; filtration coefficient at 70℃ - 8.35×10^-4 m/min^0.5 ; residue from gel breakdown at 70℃-22.7 rag/L; viscosity of fluid broken at 70℃ in 1 h with 0.06% APS added-2.65 mPa·s; use level of APS at 60-70℃-0.06-0.15% ;surface and interracial tensions-24.15% and 2.54 mN/m, respectively; relative antiswelling rate of broken fluid for a standard clay-68.3 %. The results of hydrofracturing operations with this CGHFF in 2 newly drilled production wells of depth 2000 m and reservoir temperature 70℃ in Changqing low permeable sandstone oil fields are presented briefly.

关 键 词：合成聚合物压裂液 水基交联冻胶 低分子量合成聚合物 配方研究 应用性能 水力压裂 低渗透砂岩油藏 长庆油田 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程] TE357.14