CN107795296A - 一种低渗透油藏深部调驱的方法 - Google Patents
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Abstract
本发明提供了一种低渗透油藏深部调驱的方法,依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,且三个段塞总注入量的体积比为1:8:1。该发明通过苯乙烯类柔弹性颗粒与聚丙烯酰胺聚合物微球组合调驱方法,柔弹性颗粒封堵油层裂缝和大孔道,聚合物微球驱替油层剩余油,采用不同调驱体系段塞组合达到封堵裂缝和大孔道、驱替原油的目的,实现提高油井采收率。
Description
技术领域
本发明涉及石油开采技术领域,具体涉及一种低渗透油藏深部调驱的方法。
背景技术
我国低渗透油藏探明储量占总探明储量的70%,已成为原油开采的主要领域。低渗透油藏具有储量规模大、丰度低、储层致密、开采技术要求高等特点。在低渗透油藏注水开发过程中,由于储层非均质性及裂缝的存在,注入水不均匀推进易形成优势水流通道,或沿裂缝突进,均使油井含水不断上升,化学调剖工艺技术已成为控制油井含水上升的主要手段。
ZL201210015473.X专利发明了一种冻胶调剖剂悬浮携带吸水树脂颗粒和非水溶性固体颗粒注入裂缝的方法,公告号为CN104140801A专利公开的一种铝凝胶调驱剂、CN104650842A专利公开的一种调驱组合物及调驱方法等均为金属交联或酚醛交联弱凝胶,这类方法以弱凝胶为主剂进行调剖,这类方法主要存在两个弊端:一是弱凝胶体系为聚丙烯酰胺、交联剂等多组分配制后注入地下成胶,其成胶性能受油藏环境影响而难把控;二、凝胶体系因聚丙烯酰胺线性交联使得受油藏矿化度影响,产生分子链卷曲、凝胶脱水,导致措施有效期较短,不能达到改善油藏深部水驱提高采收率的目的。
发明内容
本发明的目的是克服克服现有地下成胶体系存在的上述问题,提供一种低渗透油藏深部调驱的方法,能够实现大剂量注入、改善油藏深部水驱不均,最终提高采收率。
本发明的技术方案是提供了一种低渗透油藏深部调驱的方法,依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,且三个段塞总注入量的体积比为1:8:1;
所述柔弹性颗粒前置段塞包括以下组分:按质量比计,0.2%-0.3%柔弹性颗粒,0.05%-0.1%聚丙烯酰胺溶液,剩余为水;
所述聚合物微球主段塞包括以下组分:按质量比计,0.25%-5%聚合物微球和95%-99.75%水;
所述柔弹性颗粒保护段塞包括以下组分:按质量比计,0.3%-0.4%柔弹性颗粒,0.1%-0.15%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒前置段塞和柔弹性颗粒保护段的日注入量按体积计为1.5-2.5倍目标调驱井日注水量。
所述聚合物微球主段的日注入量按体积计为1.0倍目标调驱井日注水量。
所述的柔弹性颗粒前置段塞、聚合物微球主段塞和柔弹性颗粒保护段塞的累计总注入量按体积计为0.1-0.3倍目标调驱井控制的油层孔隙体积。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.85%-49.95%苯乙烯和49.85%-49.95%丁二烯为主剂,0.1%-0.3%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成。
所述柔弹性颗粒粒径3-6mm,断裂伸长率1000%-1300%。
所述聚合物微球的制备如下:按质量百分比计,6%-9%2-丙烯酰胺-2-甲基丙磺酸和12%-16%丙烯酰胺为共聚单体,0.2%-0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.1%-0.2%过硫酸铵为引发剂,5%-5.5%司盘60、2.5%-3.0%吐温60为分散剂,40%-45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得。
所述聚合物微球初始粒径为0.1-20μm,水化膨胀倍数5-15倍。
所述聚丙烯酰胺的分子量1500万,水解度20%-30%。
本发明的有益效果:
本发明提供的这种低渗透油藏深部调驱的方法通过向油层依次注入柔弹性颗粒段塞、聚合物微球段塞、柔弹性颗粒段塞达到深部封堵与调驱的目的,其中,柔弹性颗粒采用聚丙烯酰胺溶液携带。利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油,选用聚合物微球作为主体段塞,充分发挥聚合物微球进入油层深部驱替剩余油的优势,改善油层深部水驱不均并驱替剩余油,实现提高油井采收率的目的。
具体实施方式
实施例1:
本实施例提供了一种低渗透油藏深部调驱的方法,依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,且三个段塞总注入量的体积比为1:8:1;
所述柔弹性颗粒前置段塞包括以下组分:按质量比计,0.2%-0.3%柔弹性颗粒,0.05%-0.1%聚丙烯酰胺溶液,剩余为水;
所述聚合物微球主段塞包括以下组分:按质量比计,0.25%-5%聚合物微球和95%-99.75%水;
所述柔弹性颗粒保护段塞包括以下组分:按质量比计,0.3%-0.4%柔弹性颗粒,0.1%-0.15%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒前置段塞和柔弹性颗粒保护段的日注入量按体积计为1.5-2.5倍目标调驱井日注水量。
所述聚合物微球主段的日注入量按体积计为1.0倍目标调驱井日注水量。
所述的柔弹性颗粒前置段塞、聚合物微球主段塞和柔弹性颗粒保护段塞的累计总注入量按体积计为0.1-0.3倍目标调驱井控制的油层孔隙体积。
本发明提供的这种低渗透油藏深部调驱的方法通过向油层依次注入柔弹性颗粒段塞、聚合物微球段塞、柔弹性颗粒段塞达到深部封堵与调驱的目的,其中,柔弹性颗粒采用聚丙烯酰胺溶液携带。利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油,选用聚合物微球作为主体段塞,充分发挥聚合物微球进入油层深部驱替剩余油的优势,改善油层深部水驱不均并驱替剩余油,实现提高油井采收率的目的。
实施例2:
在实施例1的基础上,本实施例提供了一种低渗透油藏深部调驱的方法,所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.85%-49.95%苯乙烯和49.85%-49.95%丁二烯为主剂,0.1%-0.3%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成。
所述柔弹性颗粒粒径3-6mm,断裂伸长率1000%-1300%。
选用苯乙烯类柔弹性颗粒作为前置段塞和保护段塞,可以长效封堵油层裂缝和大孔道,扩大聚合物微球及后须注入水的波及体积。
实施例3:
在实施例1的基础上,本实施例提供了一种低渗透油藏深部调驱的方法,所述聚合物微球的制备如下:按质量百分比计,6%-9%2-丙烯酰胺-2-甲基丙磺酸和12%-16%丙烯酰胺为共聚单体,0.2%-0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.1%-0.2%过硫酸铵为引发剂,5%-5.5%司盘60、2.5%-3.0%吐温60为分散剂,40%-45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得。
所述聚合物微球初始粒径为0.1-20μm,水化膨胀倍数5-15倍。
选用聚合物微球作为主体段塞,充分发挥聚合物微球进入油层深部驱替剩余油的优势。
实施例4:
在实施例1的基础上,本实施例提供了一种低渗透油藏深部调驱的方法,所述聚丙烯酰胺的分子量1500万,水解度20%-30%。选用聚丙烯酰胺溶液可以悬浮携带柔弹性颗粒,可以增强柔弹性颗粒的注入性。
实施例5:
目标调驱井日注水量25m³,控制的孔隙体积为50000m³,设计总注入量0.1PV,即5000m³。通过注水井依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,各段塞的日注入量依次为50m³、25m³、50m³,各段塞总注入量依次为500m³、4000m³、500m³。
其中柔弹性颗粒前置段塞包括以下组分:按质量比计,0.2%柔弹性颗粒,0.05%聚丙烯酰胺溶液,剩余为水;
聚合物微球主段塞包括以下组分:按质量比计,0.25%聚合物微球和99.75%水;
柔弹性颗粒保护段塞包括以下组分:按质量比计,0.3%柔弹性颗粒,0.1%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.95%苯乙烯和49.95%丁二烯为主剂,0.1%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成,所述柔弹性颗粒粒径6mm,断裂伸长率1300%%。
所述聚合物微球的制备如下:按质量百分比计,9%2-丙烯酰胺-2-甲基丙磺酸和16%丙烯酰胺为共聚单体,0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.2%过硫酸铵为引发剂,5.5%司盘60、3.0%吐温60为分散剂,45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得,所述聚合物微球初始粒径为20μm,水化膨胀倍数15倍。
所述聚丙烯酰胺的分子量1500万,水解度20%。
利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油,调驱措施后,对应油井增油幅度6.5%,降水幅度10%。
实施例6:
目标调驱井日注水量20m³,控制的孔隙体积为50000m³,设计总注入量0.1PV,即5000m³。通过注水井依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,各段塞日注入量依次为30m³、20m³、50m³,各段塞总注入量依次为500m³、4000m³、500m³
其中柔弹性颗粒前置段塞包括以下组分:按质量比计,0.25%柔弹性颗粒,0.75%聚丙烯酰胺溶液,剩余为水;
聚合物微球主段塞包括以下组分:按质量比计,3%聚合物微球和97%水;
柔弹性颗粒保护段塞包括以下组分:按质量比计,0.35%柔弹性颗粒,0.12%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.95%苯乙烯和49.95%丁二烯为主剂,0.1%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成,所述柔弹性颗粒粒径6mm,断裂伸长率1300%%。
所述聚合物微球的制备如下:按质量百分比计,9%2-丙烯酰胺-2-甲基丙磺酸和16%丙烯酰胺为共聚单体,0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.2%过硫酸铵为引发剂,5.5%司盘60、3.0%吐温60为分散剂,45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得,所述聚合物微球初始粒径为20μm,水化膨胀倍数15倍。
所述聚丙烯酰胺的分子量1500万,水解度25%。
调驱措施后,对应油井增油幅度8%,降水幅度12%。
实施例7:
目标调驱井日注水量40m³,控制的孔隙体积为60000m³,设计总注入量0.2PV,即12000m³。通过注水井依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,各段塞日注入量依次为60m³、40m³、60m³,各段塞总注入量依次为1200m³、9600m³、1200m³。
其中柔弹性颗粒前置段塞包括以下组分:按质量比计,0.3%柔弹性颗粒,0.1%聚丙烯酰胺溶液,剩余为水;
聚合物微球主段塞包括以下组分:按质量比计,5%聚合物微球和95%水;
柔弹性颗粒保护段塞包括以下组分:按质量比计,0.4%柔弹性颗粒,0.15%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.95%苯乙烯和49.95%丁二烯为主剂,0.1%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成,所述柔弹性颗粒粒径6mm,断裂伸长率1300%%。
所述聚合物微球的制备如下:按质量百分比计,9%2-丙烯酰胺-2-甲基丙磺酸和16%丙烯酰胺为共聚单体,0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.2%过硫酸铵为引发剂,5.5%司盘60、3.0%吐温60为分散剂,45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得,所述聚合物微球初始粒径为20μm,水化膨胀倍数15倍。
所述聚丙烯酰胺的分子量1500万,水解度30%。
利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油。调驱措施后,对应油井增油幅度9.5%,降水幅度12.5%。
实施例8:
目标调驱井日注水量40m³,控制的孔隙体积为60000m³,设计总注入量0.2PV,即12000m³。通过注水井依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,各段塞日注入量依次为60m³、40m³、60m³,各段塞总注入量依次为1200m³、9600m³、1200m³。
其中柔弹性颗粒前置段塞包括以下组分:按质量比计,0.3%柔弹性颗粒,0.1%聚丙烯酰胺溶液,剩余为水;
聚合物微球主段塞包括以下组分:按质量比计,5%聚合物微球和95%水;
柔弹性颗粒保护段塞包括以下组分:按质量比计,0.4%柔弹性颗粒,0.15%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.9%苯乙烯和49.9%丁二烯为主剂,0.2%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成,所述柔弹性颗粒粒径5mm,断裂伸长率1200%%。
所述聚合物微球的制备如下:按质量百分比计,7.5%2-丙烯酰胺-2-甲基丙磺酸和14%丙烯酰胺为共聚单体,0.25%N,N-亚甲基双丙烯酰胺为交联剂,0.15%过硫酸铵为引发剂,5.25%司盘60、2.75%吐温60为分散剂,42.5%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得,所述聚合物微球初始粒径为20μm,水化膨胀倍数15倍。
所述聚丙烯酰胺的分子量1500万,水解度30%。
利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油。调驱措施后,对应油井增油幅度9.5%,降水幅度12.5%。
实施例9:
目标调驱井日注水量40m³,控制的孔隙体积为60000m³,设计总注入量0.2PV,即12000m³。通过注水井依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,各段塞日注入量依次为60m³、40m³、60m³,各段塞总注入量依次为1200m³、9600m³、1200m³。
其中柔弹性颗粒前置段塞包括以下组分:按质量比计,0.3%柔弹性颗粒,0.1%聚丙烯酰胺溶液,剩余为水;
聚合物微球主段塞包括以下组分:按质量比计,5%聚合物微球和95%水;
柔弹性颗粒保护段塞包括以下组分:按质量比计,0.4%柔弹性颗粒,0.15%聚丙烯酰胺,剩余为水。
所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.85%苯乙烯和49.85%丁二烯为主剂,0.3%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成,所述柔弹性颗粒粒径6mm,断裂伸长率1300%%。
所述聚合物微球的制备如下:按质量百分比计,6%2-丙烯酰胺-2-甲基丙磺酸和12%丙烯酰胺为共聚单体,0.2%N,N-亚甲基双丙烯酰胺为交联剂,0.1%过硫酸铵为引发剂,5.0%司盘60、2.5%吐温60为分散剂,40%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得,所述聚合物微球初始粒径为20μm,水化膨胀倍数15倍。
利用柔弹性颗粒封堵油层裂缝和大孔道、扩大波及体积,利用聚合物微球驱替油层剩余油。调驱措施后,对应油井增油幅度10%,降水幅度13%。
综上所述,本发明提供的这种低渗透油藏深部调驱技术方法,注入量大,采用不同调驱体系段塞组合达到封堵裂缝和大孔道、驱替原油的目的,实现提高油井采收率。
以上例举仅仅是对本发明的举例说明,并不构成对本发明的保护范围的限制,凡是与本发明相同或相似的设计均属于本发明的保护范围之内。
Claims (9)
1.一种低渗透油藏深部调驱的方法,其特征在于:依次向油层注入柔弹性颗粒前置段塞、聚合物微球主段塞、柔弹性颗粒保护段塞,且三个段塞总注入量的体积比为1:8:1;
所述柔弹性颗粒前置段塞包括以下组分:按质量比计,0.2%-0.3%柔弹性颗粒,0.05%-0.1%聚丙烯酰胺溶液,剩余为水;
所述聚合物微球主段塞包括以下组分:按质量比计,0.25%-5%聚合物微球和95%-99.75%水;
所述柔弹性颗粒保护段塞包括以下组分:按质量比计,0.3%-0.4%柔弹性颗粒,0.1%-0.15%聚丙烯酰胺,剩余为水。
2.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述柔弹性颗粒前置段塞和柔弹性颗粒保护段的日注入量按体积计为1.5-2.5倍目标调驱井日注水量。
3.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述聚合物微球主段的日注入量按体积计为1.0倍目标调驱井日注水量。
4.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述的柔弹性颗粒前置段塞、聚合物微球主段塞和柔弹性颗粒保护段塞的累计总注入量按体积计为0.1-0.3倍目标调驱井控制的油层孔隙体积。
5.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述柔弹性颗粒的制备方法如下:按质量百分比计,以49.85%-49.95%苯乙烯和49.85%-49.95%丁二烯为主剂,0.1%-0.3%过氧化苯甲酰为引发剂进行聚合得到胶状体,再经造粒而成。
6.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述柔弹性颗粒粒径3-6mm,断裂伸长率1000%-1300%。
7.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述聚合物微球的制备如下:按质量百分比计,6%-9%2-丙烯酰胺-2-甲基丙磺酸和12%-16%丙烯酰胺为共聚单体,0.2%-0.3%N,N-亚甲基双丙烯酰胺为交联剂,0.1%-0.2%过硫酸铵为引发剂,5%-5.5%司盘60、2.5%-3.0%吐温60为分散剂,40%-45%白油为外相,剩余为水,水为内相,采用反相乳液聚合法合成而得。
8.如权利要求7所述的低渗透油藏深部调驱的方法,其特征在于:所述聚合物微球初始粒径为0.1-20μm,水化膨胀倍数5-15倍。
9.如权利要求1所述的低渗透油藏深部调驱的方法,其特征在于:所述聚丙烯酰胺的分子量1500万,水解度20%-30%。
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