CN106089170B - 一种向稠油注高温热水增温自燃点火方法 - Google Patents
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Abstract
本发明涉及一种向稠油注高温热水增温自燃点火方法,针对现有空气驱采油点火存在点火成功率低、安全性差等问题,本发明加入裂解催化剂组合物和高温热水,通过水热裂解的方法,使得空气驱采油自燃点火成功率提高,安全性好。
Description
技术领域
本发明涉及一种向稠油注高温热水增温自燃点火方法,属油田采油领域。
背景技术
稠油重质分含量高,造成粘度高,流动性差。基于稠油粘度对温度的强敏感特性,热力采油方法通常被认为是开采稠油油藏最有效的手段,我国大部分油田以蒸汽吞吐方式开采稠油,取得良好的经济效益,但注蒸汽条件下,稠油粘度下降只是暂时的,随着注入和开采过程中的热量损失,温度下降,稠油粘度逐渐回升,给井筒举升和地面技术带来一系列困难。
空气驱技术是利用地层中原油中的重质分作为燃料,利用空气或富氧作为助燃剂,采取自然和人工点火等方法,使油层温度达到原油燃点,并连续注入助燃剂,使油层原油持续氧化裂解,重质组分高温下发生裂解反应,注入的气体与重油发生裂解反应生成轻质油及烟道气,烟道气及水蒸汽、压力等多项混相气体用于驱动原油向生产井流动,并从生产井采出。
空气驱采油比蒸汽采油现场条件更广泛,尤其是埋藏较深的油层。空气驱通常采取人工点火的方式,点火是成功开展空气驱的第一步,也是最关键的步骤,点火成功不仅能使油层处于氧化裂解状态,更能加快从低温氧化向高温氧化的转变,是后期空气驱取得较好效果的基础。但是现有点火方法存在点火成功率低、安全性差等问题。
发明内容
为了解决现有技术存在的上述问题,本发明的目的是提供一种向稠油注高温热水增温自燃点火方法,其点火成功率高,安全性好,该点火方法适用于油藏埋深在1200-2000米、油藏温度在60-72℃之间的稠油油藏。
本发明涉及一种向稠油注高温热水增温自燃点火方法,包括以下步骤:步骤1.对注气井进行防腐完井,在井下装设封隔器及补偿器;步骤2.向稠油油藏中注入1-3吨的裂解催化剂组合物;步骤3.向注气井注入50-300吨130-170℃热水来进行地层增温预热及水热裂解反应;步骤4.向地层中注入富氧混合气0.1-0.3PV,对地层中目的油藏进行自燃点火。
步骤2中裂解催化剂组合物各组分按质量百分比包括Tween-80(失水山梨醇单油酸酯聚氧乙烯醚)10-20%、NiSO4·6H2O 10-20%、Span-80(山梨糖醇酐油酸酯)15-25%、EDTMPS(乙二胺四亚甲基膦酸钠)25-30%、KCl 15-25%。
其中,Tween-80:分子中有较多的亲水性基团一聚氧乙烯基,故亲水性强,为一种非离子型去污剂,可有效降低原油粘度。
NiSO4·6H2O:为含6分子结晶水的α型蓝绿色四方结晶,在53℃转变为β型绿色透明结晶,协同作用中作为一种高效的过渡金属催化剂。
Span-80:在采油工程中可作为乳化剂、助溶剂,可于Tween-80复合作用进行对稠油中的胶质、沥青质进行乳化、形成水包油型乳化液,有效改善油品性质。
EDTMPS:是含氮有机多元膦酸,属阴极型缓蚀剂,与无机聚磷酸盐相比,缓蚀率高3~5倍,在水溶液中能离解成8个正负离子,因而可以与多个金属离子螯合,形成多个单体结构大分子网状络合物,松散地分散于水中,可有效与地层中原有金属离子发生作用,达到催化剂的目的。
KCl:在协同作用下,可有效增加地层中岩石的亲水性,同属于金属催化剂。
步骤3中注入热水推动化学剂进一步像外扩展,使之较为均匀的分部在地层,并吸附在多孔介质表面,形成一种催化剂单元,当催化剂经过沥青质单元时,就会发生裂解反应而使稠油改质降粘,通过井下改造油藏多孔介质成为一种天然反应器,可实现最大化利用油藏矿物与化学剂间的地质协同作用。
步骤4中富氧混合气按质量百分比由氧气50-70%,氮气30-50%组成。
与现有技术相比,本发明中的向稠油注高温热水增温自燃点火方法具有以下有益效果:
1.相对传统空气驱点火方式,本发明可以直接将裂解前沿推进至距注气井井底2-6米处,有效解决注入井井下近井地带难以驱动的稠油形成的死油区、油墙,从而更高效进行空气驱采油。
2.先注高温热水对目的油层进行预热,同时高温热水还能起到安全防护作用,能有效减少井下安全事故的发生,防止安全隐患。
3.通过水热裂解反应的辅助,实现空气驱采油自燃点火成功率大大提高。
4.水热裂解点火方法加快了空气驱氧化裂解的速度,在氧化裂解前沿之前有水热裂解(而传统空气驱采油方式并不具备此项技术),使裂解前沿推进过程中,推进前沿都已水热裂解,可使氧化裂解速度加快、减少前期氧化裂解反应时间,能起到减少点火时间的目的,并提高点火成功率。
5.本发明的富氧混合气中氧气的质量百分比为50-70%,并且注入130-170℃热水,在此高浓度氧气和高温热水作用下,可以快速预热目的油层达到油藏裂解温度,裂解温度高,点火时间短,反应周期短。
具体实施方式
下面通过实施例,对本发明的技术方案作进一步的具体说明。
实施例1
一种向稠油注高温热水增温点火方法,包括:步骤1.对注气井进行防腐完井,在井下装设封隔器及补偿器;步骤2.向稠油油藏中注入1吨的裂解催化剂组合物;步骤3.向注气井注入80吨120℃热水来进行地层增温预热及水热裂解反应;步骤4.向地层中注入富氧混合气0.1PV,对地层中目的油藏进行自燃点火。其中,裂解催化剂组合物各组分按质量百分比包括:Tween-8015%、NiSO4·6H2O 15%、Span-8020%、EDTMPS(乙二胺四亚甲基膦酸钠)28%、KCl 22%。富氧混合气按质量百分比由氧气70%,氮气30%组成。
实施例2
一种向稠油注高温热水增温点火方法,包括:步骤1.对注气井进行防腐完井,在井下装设封隔器及补偿器;步骤2.向稠油油藏中注入2吨的裂解催化剂组合物;步骤3.向注气井注入100吨150℃热水来进行地层增温预热及水热裂解反应;步骤4.向地层中注入富氧混合气0.12PV,对地层中目的油藏进行自燃点火。其中,裂解催化剂组合物各组分按质量百分比包括:Tween-8010%、NiSO4·6H2O 20%、Span-8025%、EDTMPS(乙二胺四亚甲基膦酸钠)25%、KCl 20%。富氧混合气按质量百分比由氧气60%,氮气40%组成。
实施例3
一种向稠油注高温热水增温点火方法,包括:步骤1.对注气井进行特殊防腐完井,在井下装设封隔器及补偿器;步骤2.向稠油油藏中注入2.5吨的裂解催化剂组合物;步骤3.向注气井注入150吨160℃热水来进行地层增温预热及水热裂解反应;步骤4.向地层中注入富氧混合气0.15PV,对地层中目的油藏进行自燃点火。其中,裂解催化剂组合物各组分按质量百分比包括:Tween-80 12%、NiSO4·6H2O 18%、Span-80 20、EDTMPS(乙二胺四亚甲基膦酸钠)30%、KCl 20%。富氧混合气按质量百分比由氧气70%,氮气30%组成。
Claims (2)
1.一种向稠油注高温热水增温自燃点火方法,其特征在于,包括以下步骤:步骤1.对注气井进行防腐完井,在井下装设封隔器及补偿器;步骤2.向稠油油藏中注入1-3吨的裂解催化剂组合物;步骤3.向注气井注入50-300吨130-170℃热水来进行地层增温预热及水热裂解反应;步骤4.向地层中注入富氧混合气0.1-0.3PV,对地层中目的油藏进行自燃点火;
所述裂解催化剂组合物各组分按质量百分比包括:Tween-80(失水山梨醇单油酸酯聚氧乙烯醚)10-20%、NiSO4·6H2O 10-20%、Span-80(山梨糖醇酐油酸酯)15-25%、EDTMPS(乙二胺四亚甲基膦酸钠)25-30%、KCl15-25%。
2.根据权利要求1所述的自燃点火方法,其特征在于,富氧混合气按质量百分比由氧气50-70%,氮气30-50%组成。
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