桩106单元提高采收率强化调驱体系研究

Highly Effective ASP Flooding Fluid and Its Use in Zhuang-106 Unit after Sufficient Indepth Profile Modification

所报道的强化调驱技术是水驱油藏在充分、深部调剖之后注入少量高效驱油剂的提高采收率技术。本文报道高效驱油剂的筛选及用量优化。含复碱（Na2CO^3-NaHCO3，质量比1：1）0．8％，木质素磺酸钠（SLS）＋烷基苯磺酸盐（SDBS）0．4％的体系，在LS、SDBS质量比为1．5～3．0时，与原油（黏度19．3mPa·s，70℃，5111／s）间形成10．3mN／m超低界面张力。喇。。以口谢。为评价指标，通过正交设计实验，求得驱油剂最佳配方为：0．32％SIS＋0．12％SDBS＋0．15％HPAM＋1．2％复碱。在注入、采出口之间有高渗透条带的平板砂岩模型上，在70℃研究了水驱、注调剖剂、注驱油剂各阶段注入压力变化，及充分调剖（0．515PV）之后采收率与驱油剂注入量之间的关系，求得最佳（最经济）的注入量为0．05PV。该技术在地层温度64℃、综合含水已达93．7％、采出程度仅21．6％的胜利油田桩106单元应用，获得了很好的结果，在包含一注四采的桩106—32井组，日产油量增加22．8吨，综合含水由94．5％降至88．4％；报道了所用调剖剂的组成。图4表3参7。

A modified chitosan （MCS）, N-（2-hydroxyl-3-sulfo） propanyl chitosan, with improved hydrophily and soluble in lots of polar solvents is prepared by reacting chitosan of 90% deacetylation with 2,3-epoxypropyl sulfonic acid in isopropanol solution. The degree of substitution, DS, of the MCS increases with increasing reaction temperature and time and reaches its highest value of 85 % in 8 hr reaction at 60℃. The procedure of synthesis is dipicted and the chemical structure of the MCS synthesized is identified IRphotometrically. The viscosity at 25℃ of 1% aqueous solution of the MCS decreases from 268 to 158 mPa.s when its DS increased from 13 % to 85 %. At equal dosage of 0.01%, the capability of the MCS to stabilize the foam formed by 0.01 mol/L solution of 4 foaming agent, anionic and nonionic, determined as foam half-life, decreases with increasing its DS value. For the MCS with DS = 13%, its foam stabilizing capability, determined as foam creation and half-life with nonionic foaming agent AEO-9, is higher than commonly used polymeric foam stabilizers PVA, CMS-Na, and PAM at equal dosage of 0.01%.