石油化工高等学校学报
石油化工高等學校學報
석유화공고등학교학보
JOURNAL OF PETROCHEMICAL UNIVERSITIES
2014年
6期
67-71
,共5页
吴文祥%史雪冬%卢澍韬%何向洋
吳文祥%史雪鼕%盧澍韜%何嚮洋
오문상%사설동%로주도%하향양
耐高温%水解度%老化时间%第一法向应力差%驱油效果
耐高溫%水解度%老化時間%第一法嚮應力差%驅油效果
내고온%수해도%노화시간%제일법향응력차%구유효과
Heat-resistant%Hydrolytic degree%Aging time%First normal stress difference%Oil displacement efficiency
双河油田Ⅶ1-3层系为高温(96.5℃)低渗油藏,针对这一特点选用河南油田生产相对分子质量为2200×104耐高温聚合物进行聚合物特性及驱油效果研究。实验测定该耐高温聚合物溶液在95℃不同老化时间下水解度、黏度和第一法向应力差的变化规律,并进行岩心驱油性能评价实验,研究该耐高温聚合物是否具有良好的应用性。结果表明,该耐高温聚合物老化初期水解度增长较快,当水解度达到一定程度时增长速度变缓,在60 d左右趋于平稳;耐高温聚合物黏度在90 d 过程中会经历下降、上升及缓慢下降3个过程,但90 d 老化时间下黏度保留率均在80%以上,且质量浓度越高黏度保留率越好;第一法向应力差同样经历下降、上升及缓慢下降3个过程,保留率均在49%以上,说明该聚合物在高温老化下具有良好的弹性保留能力。岩心驱油实验表明,当注入聚合物质量浓度为2000 mg/L,段塞尺为0.5 PV 时,化学驱驱油效率在24%以上,驱油效果良好。
雙河油田Ⅶ1-3層繫為高溫(96.5℃)低滲油藏,針對這一特點選用河南油田生產相對分子質量為2200×104耐高溫聚閤物進行聚閤物特性及驅油效果研究。實驗測定該耐高溫聚閤物溶液在95℃不同老化時間下水解度、黏度和第一法嚮應力差的變化規律,併進行巖心驅油性能評價實驗,研究該耐高溫聚閤物是否具有良好的應用性。結果錶明,該耐高溫聚閤物老化初期水解度增長較快,噹水解度達到一定程度時增長速度變緩,在60 d左右趨于平穩;耐高溫聚閤物黏度在90 d 過程中會經歷下降、上升及緩慢下降3箇過程,但90 d 老化時間下黏度保留率均在80%以上,且質量濃度越高黏度保留率越好;第一法嚮應力差同樣經歷下降、上升及緩慢下降3箇過程,保留率均在49%以上,說明該聚閤物在高溫老化下具有良好的彈性保留能力。巖心驅油實驗錶明,噹註入聚閤物質量濃度為2000 mg/L,段塞呎為0.5 PV 時,化學驅驅油效率在24%以上,驅油效果良好。
쌍하유전Ⅶ1-3층계위고온(96.5℃)저삼유장,침대저일특점선용하남유전생산상대분자질량위2200×104내고온취합물진행취합물특성급구유효과연구。실험측정해내고온취합물용액재95℃불동노화시간하수해도、점도화제일법향응력차적변화규률,병진행암심구유성능평개실험,연구해내고온취합물시부구유량호적응용성。결과표명,해내고온취합물노화초기수해도증장교쾌,당수해도체도일정정도시증장속도변완,재60 d좌우추우평은;내고온취합물점도재90 d 과정중회경력하강、상승급완만하강3개과정,단90 d 노화시간하점도보류솔균재80%이상,차질량농도월고점도보류솔월호;제일법향응력차동양경력하강、상승급완만하강3개과정,보류솔균재49%이상,설명해취합물재고온노화하구유량호적탄성보류능력。암심구유실험표명,당주입취합물질량농도위2000 mg/L,단새척위0.5 PV 시,화학구구유효솔재24%이상,구유효과량호。
According to the characteristics of physical reservoir properties of the Shuanghe Ⅶ 1-3layer series,such as high formation temperature(96.5 ℃)and low permeability,heat-resistant polymer with molecular weight of 2 200×10 4 which was produced by Henan oilfield was selected to study characterization of polymer and oil displacement efficiency.The degree of hydrolysis,solution viscosity and first normal stress difference were measured at 95 ℃.And core flooding experiments were conducted to evaluate whether heat-resistant polymer had good application.The results showed that the hydrolytic degree of heat-resistant polymer was increased faster at the early aging,while the growth rate was slowed when the hydrolytic degree reached a certain level and kept the long-term stability in 60 days.The solution viscosity experienced three process in 90 days:first decreased then increased,finally decreased slowly.The viscosity retention ratio was maintained above 80% and the higher the concentration of solution,the better retention ratio.The first normal stress difference also experienced the same process as solution viscosity and retention ratio was maintained above 49%.It illustrated this polymer had good elastic retention ability. The oil displacement experiment showed that the oil flooding efficency was above 24% when injection concentration was 2 000 mg/L and the slug size was 0.5 PV.