CAJ | 학술논문

STP强凝胶调堵剂由聚丙烯酰胺、交联剂及延缓剂组成.其中,聚丙烯酰胺的相对分子量为4.00× 106-7.00×106、水解度为17.6%;交联剂为Na2Cr2O7+NH4Cl氧化还原体系;延缓剂为加入乙二醇的乳酸/丙酸/乙酸有机酸复配体系.考察了pH值、温度、矿化度及延缓剂用量等因素对STP强凝胶成胶的影响.筛选出STP强凝胶成胶的最佳条件:pH值为5.2,温度为55℃、矿化度小于7 g/L.在此条件下调节延缓剂用量可控制成胶时间(12-144 h).在由3支串联高渗透率岩心和3支串联低渗透率岩心并联而成的非均质模型上,对STP液典型配方进行深部调剖驱油模拟实验研究.结果表明,在水驱饱和油之后(合层采收率为24.3%),依次用调堵剂封堵第一、第二、第三高渗岩心后水驱,合层采收率分别达46.8%、62.2%和69.1%.由此可以得出,封堵深度越大,提高采收率的幅度越大;深部调剖可增加注水对低渗透层的波及程度,未成胶的调堵剂液通过高渗层时可驱替其中的残余油.
STP강응효조도제유취병희선알、교련제급연완제조성.기중,취병희선알적상대분자량위4.00× 106-7.00×106、수해도위17.6%;교련제위Na2Cr2O7+NH4Cl양화환원체계;연완제위가입을이순적유산/병산/을산유궤산복배체계.고찰료pH치、온도、광화도급연완제용량등인소대STP강응효성효적영향.사선출STP강응효성효적최가조건:pH치위5.2,온도위55℃、광화도소우7 g/L.재차조건하조절연완제용량가공제성효시간(12-144 h).재유3지천련고삼투솔암심화3지천련저삼투솔암심병련이성적비균질모형상,대STP액전형배방진행심부조부구유모의실험연구.결과표명,재수구포화유지후(합층채수솔위24.3%),의차용조도제봉도제일、제이、제삼고삼암심후수구,합층채수솔분별체46.8%、62.2%화69.1%.유차가이득출,봉도심도월대,제고채수솔적폭도월대;심부조부가증가주수대저삼투층적파급정도,미성효적조도제액통과고삼층시가구체기중적잔여유.
The profile control hard-gel is composed of polyarylamide (5-6g/L), whose molecular weight is 4,000,000 - 7,000,000 and hydrolysis degree is 17.6%, and cross-linking oxidation-reduction agent (Na2Cr2O7 + NH4Cl), with an delayed organic acid crosslinker which contains lactic acid/propionic acid/ethanoic acid and ethylene glycol. After research of the influence factors, such as pH, temperature, salinity and the dosage of delayed crosslinker, the optimum condition(pH 5.2, temperature 55℃, salinity ＜ 7g/L) was found. Gelation time (12-144h) can be controlled by adjusting the dosage of the delayed crosslinker. Deep profile control experiments are carried out on heterogeneous models, which contains three serial high permeable and low permeable cores arranged in a parallel. After water flooding (total recovery, 24.3%), the first, second and third high-permeable cores each are sealed in turn by the profile control agent, and the total displacement recovery increases to 46.8%, 62.2% and 69.1% respectively. So, the greater the sealed depth, the larger the enhancing recovery will be. Finally, the oil displacement mechanisms of deep profile control are discussed.