高矿化度下弱凝胶体系调剖性能研究
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摘要
通过单因素实验和正交实验考察了聚合物浓度、交联剂浓度、稳定剂浓度及氯化铬/乳酸摩尔比对凝胶性能的影响,研制了一种适用于高矿化度低渗透裂缝性油藏的弱凝胶体系配方,并对弱凝胶体系的驱油效果进行了研究。实验结果表明,在实验温度32℃、地层水矿化度为29 500 mg/L条件下,优选出弱凝胶体系配方为:聚合物质量浓度2 000 mg/L,稳定剂质量浓度800 mg/L,交联剂质量浓度200 mg/L,三氯化铬/乳酸的摩尔比为1∶8;弱凝胶体系注入量越大(0.3～0.6 PV),低渗层采收率提高值越高,对于层间差异大的油层,或对于存在高渗透率的油层,加大注入凝胶量才能调整流量分配,注凝胶后的注入水更多的进入低渗透油层驱油,采收率提高值大于15%。
Through single factor experiment and orthogonal experiment of gel system,the influences of polymer concentration,crosslinking agent concentration and ratio,stabilizer concentration and temperature on gel properties were studied. A weak gel system suitable for low permeability fractured reservoirs with high salinity was developed. And the plugging ability and oil displacement effect were studied. The results showed that under the conditions of 32 ℃ and salinity 29 500 mg/L,a weak gel formulation of polymer concentration 2 000 mg/L,stabilizer concentration 800 mg/L,crosslinking agent concentration 200 mg/L,and chromium trichloride and lactic acid mole ratio 1 ∶ 8 was preferred. The shearing,salt resistance and good plugging effect of this weak gel system were showed up. The greater the injection amount(0.3-0.6 PV)of the weak gel was,the higher enhanced oil recovery value in the low permeability tube was. For layers with big difference or existing high permeability,the flow distribution could be adjusted by increasing the injection amount(0.6 PV). In addition,the enhanced oil recovery value was greater than 15%.
Through single factor experiment and orthogonal experiment of gel system,the influences of polymer concentration,crosslinking agent concentration and ratio,stabilizer concentration and temperature on gel properties were studied. A weak gel system suitable for low permeability fractured reservoirs with high salinity was developed. And the plugging ability and oil displacement effect were studied. The results showed that under the conditions of 32 ℃ and salinity 29 500 mg/L,a weak gel formulation of polymer concentration 2 000 mg/L,stabilizer concentration 800 mg/L,crosslinking agent concentration 200 mg/L,and chromium trichloride and lactic acid mole ratio 1 ∶ 8 was preferred. The shearing,salt resistance and good plugging effect of this weak gel system were showed up. The greater the injection amount(0.3-0.6 PV)of the weak gel was,the higher enhanced oil recovery value in the low permeability tube was. For layers with big difference or existing high permeability,the flow distribution could be adjusted by increasing the injection amount(0.6 PV). In addition,the enhanced oil recovery value was greater than 15%.
引文
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[18]赵晓非,于庆龙,晏凤,等.有机铬弱凝胶深部调剖体系的研究及性能评价[J].特种油气藏,2013,20(3):114-117,156-157.
[19]栾洪波.深部调剖交联体系的研究[D].大庆:大庆石油学院,2010.
[2]庞德新,张元,陈铁龙.弱凝胶CN-2调驱在乌尔禾S6油藏中的应用[J].新疆石油科技,2006,16(3):35-38,41.
[3]陈铁龙,侯天江,赵继宽,等.高矿化度下影响弱凝胶调驱剂性能因素的研究[J].油田化学,2003,420(4):351-353,367.
[4]袁广均.HPAM延缓交联弱凝胶体系研究[J].内蒙古石油化工,2005,23(5):123-124.
[5]Sydansk R D.A new conformance-improvement-treatment chromium(Ⅲ)gel technology[J].Doi:10.2118/17329-MS.
[6]Nijenhuis K.Viscoelastic behaviour of partly hydrolysed polyacrylamide/chromium(Ⅲ)gels[J].Rheol Acta,2003,42(6):132-141.
[7]Menjivar J.Use of gelation theory to characterize metal crosslinked polymer gels,in water soluble polymers[J].Am Chem Soc,1986,64(5):209-226.
[8]Prudhomme R K,Uhl J T,Poinsatte J P.Rheological monitoring of the formation of polyacrylamide/Cr3+gels[J].Soc Petrol Eng J,1983,23(5):804-808.
[9]Shu P.Gelation mechanism of chromium(Ⅲ),in oil-field chemistry[J].Am Chem Soc,1988,33(1):43-48.
[10]Tackett J.Characterization of chromium(Ⅲ)acetate in aqueous solution[J].Appl Spectrosc,1989,43(3):490-499.
[11]Jain R,McCool C S,Green D W,et al.Reaction kinetics of the uptake of chromium(Ⅲ)acetate by polyacrylamide[J].Doi:10.2118/89399-MS.
[12]Chauveteau G,Omari A,Tabary R.Controlling gelation time and microgel size for water shutoff[J].J Pet Sci Technol,2002,53(3):51-52.
[13]Liu Jin,Seright R S.Rheology of gels used for conformance control in fractures[J].Doi:10.2118/59318-MS.
[14]Grattoni C,Al-Sharji H H,Yang Canghu.Rheology and permeability of crosslinked polyacrylamide gel[J].J Colloid Interface Sci,2001,240(2):601-606.
[15]Vega I N,Morris W,Robles J L,et el.Water shut-off polymer systems:Design and efficiency evaluation based on experimental studies[J].Doi:10.2118/129940-MS.
[16]Saez M,Paponi H M,Cabrera F A,et al.Improving volumetric efficiency in an unconsolidated sandstone reservoir with sequential injection of polymer gels[J].Doi:10.2118/150492-MS.
[17]章磊.HPAM弱凝胶交联体系结构及流变性研究[D].大庆:东北石油大学,2016.
[18]赵晓非,于庆龙,晏凤,等.有机铬弱凝胶深部调剖体系的研究及性能评价[J].特种油气藏,2013,20(3):114-117,156-157.
[19]栾洪波.深部调剖交联体系的研究[D].大庆:大庆石油学院,2010.