CN107989600B - 一种水基痕量化学示踪剂及用于测量注水井井间连通性的方法 - Google Patents
一种水基痕量化学示踪剂及用于测量注水井井间连通性的方法 Download PDFInfo
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Abstract
本发明公开了一种水基痕量化学示踪剂,该示踪剂的组分包括全氟烷基磺酸盐累或全氟烷基羧酸盐类。利用水基痕量化学示踪剂测量注水井井间连通性的方法:将示踪剂配制成一定浓度的水溶液,加入到注入水中,注入井内;注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度。通过示踪剂监测,可以了解注水井组油水井的连通情况,了解在注水波及油层范围内渗透率、孔隙度变化及自然裂缝和人工裂缝走向,确定合理注采比,优化注采平衡。本发明的示踪剂无辐射、无毒,安全环保;用量少,耐高温高压,只溶于水,生物稳定性及化学稳定性好,可在地层长期有效。
Description
技术领域
本发明涉及属于石油天然气增产技术领域,具体涉及一种环保型水基痕量化学示踪剂及及其用于测量注水井井间连通性的方法。
背景技术
在水驱开发油层中应用水溶性示踪剂已有多年历史,但最初只是用来定性地了解地下流体运动状况。60年代中期,美国斯坦福大学的Brigham和Smith提出了五点井网中示踪剂流动性预测方法后,人们从相反的角度对它加以运用,用来解释油藏的非均质性特征,从而使示踪剂资料的解释向定量化发展。目前已经能够定量地解释井间油层的分层状况及动用状况、注采井间波及状况、评价措施效果等,其应用领域愈来愈广泛,其应用规模愈来愈大,已成为重要的油藏工程手段。
我国也是在上个世纪80年代以后,伴随着三次采油技术在油田中的应用和油田调整挖潜的需要,井间示踪技术也得到了广泛的应用发展,并获得了良好的效果。在指导油田开发的实践、认识油藏的非均质特征和三次采油提高采收率机理,以及提高原油产量等诸多方面发挥了作用,其经济效益是十分明显的。
随着我国大部分油田进入高含水特高含水期,非均质程度及大孔道串流日趋严重,目前广泛采用化学示踪剂、放射性示踪剂,但因其受到监测的可靠性和解析的多解性影响,而越来越受到限制。因此,准确的了解非均质油藏高渗透条带大孔道的动态,就显得极为重要。
目前示踪剂分为化学示踪剂、放射性同位素示踪剂及非放射性同位素示踪剂等。
化学示踪剂被称为第一代示踪剂,主要以各种无机盐、染料、卤代烃和醇为代表,检测工具包括分光光度计等,检测精度只能达到10-4~10-6的级别。化学示踪剂具有适应性差、用量大、成本高、测试精度低、对原油后加工存在影响及解释过程中不确定因素等缺点。因此,呈逐渐淘汰趋势。
放射性同位素示踪剂被称为第二代示踪剂,主要以氚水、氚化烷烃、氚化醇等为代表,检测工具包括液相闪烁仪等,检测精度可以达到10-9的级别。放射性同位素示踪剂由于用量少,易加入,易检测,价格便宜等优点,得到了广泛应用。但是放射性同位素示踪剂的投加、检测,需要专门的人员和部门,还要符合国家有关放射性药剂的管理要求。
非放射性同位素示踪剂为第三代示踪剂技术,又称稳定同位素示踪剂技术,主要以存在于各类药剂中,可以活化的非放射性同位素等为代表,检测手段包括中子活化技术、液相闪烁检测等,检测精度可以达到10-12的级别。非放射性同位素示踪剂由于具有放射性同位素示踪剂的优点,同时克服了放射性示踪剂的在添加、取样、管理等方面的缺点,因此应用前景看好。但是非放射性同位素是需要进行反应堆激活,所以其检测还是需要专门的人员及部门,在缺少专业部门参与的情况下难以完成检测。
发明内容
本发明的一个目的是解决至少上述问题和/或缺陷,并提供至少后面将说明的优点。
本发明还有一个目的是提供一种水基痕量化学示踪剂,解决现有的示踪剂,适应性差、用量大、成本高、测试精度低,监测可靠性差,使用范围受到限制等技术问题。
本发明还有一个目的是提供一种利用水基痕量化学示踪剂测量注水井井间连通性的方法。
为了实现本发明这些目的和其它优点,本发明提供了一种水基痕量化学示踪剂,该示踪剂的组分包括全氟烷基磺酸盐或全氟烷基羧酸盐。
优选的是,所述全氟烷基磺酸盐为全氟烷基磺酸钠类。进一步优选的是,所述全氟烷基磺酸钠包括但是不限于全氟丁基磺酸钠、全氟戊基磺酸钠、全氟己基磺酸钠、全氟庚基磺酸钠、全氟辛基磺酸钠、全氟壬基磺酸钠、全氟癸基磺酸钠、全氟十一烷基磺酸钠、全氟十二烷基磺酸钠、全氟萘磺酸钠、全氟丁基萘磺酸钠、全氟二丁基萘磺酸钠中的至少一种。
优选的是,所述全氟烷基羧酸盐为全氟烷基羧酸钠。进一步优选的是,所述全氟烷基羧酸钠包括但是不限于全氟丁基羧酸钠、全氟戊基羧酸钠、全氟己基羧酸钠、全氟庚基羧酸钠、全氟辛基羧酸钠、全氟壬基羧酸钠、全氟癸基羧酸钠、全氟十一烷基羧酸钠、全氟十二烷基羧酸钠中的至少一种。
一种利用上述的水基痕量化学示踪剂测量注水井井间连通性的方法,具体为:将示踪剂配制成一定浓度的水溶液,加入到注入水中,注入井内;注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度。
优选的是,上述测量注水井井间连通性的方法,包括以下步骤:
步骤一,根据水井需要测试的目的选择不同的示踪剂,每种示踪剂均为本发明上述的水基痕量化学示踪剂,且所选的化学示踪剂在气层温度及地层压力下能够保持原来的特性;
步骤二,结合压力、地层岩性条件等条件确定化学示踪剂用量;
步骤三,将示踪剂配制成一定浓度的水溶液,示踪剂水溶液封装于高压柱塞泵的药剂仓内,通过高压柱塞泵加载的方式将示踪剂连续注入到井筒内,将示踪剂全部注入后,卸载注入装置、恢复注水流程;
步骤四,在注水完成后投产时采集注水样品,经过预处理后,分析化学示踪剂的浓度;
步骤五,将浓度随时间的变化得到示踪剂产出曲线,可以查明注入流体推进方向,确定注采连通关系,查明水淹方向与层位,查明管内/外、层间窜流及层内绕流等。
进一步优选的是,在步骤二中化学示踪剂用量的计算公式为:
示踪剂的注入量取决于被跟踪流体的最大稀释体积和检测仪器的最低检测限,根据油藏的静态资料来计算示踪剂的用量,详细的计算方法见下式:
A=S·Vp·μ
式中,S为最低检测限;μ为保障系数;A为示踪剂的注入量(Ng);Vp为示踪剂最大稀释体积(m3);
Vp=π·r2·h·Φ·Sw·f
式中,r为注水井至各采油井之间平均井距(m);h为油藏平均厚度(m);Φ为孔隙度;Sw为平均含水饱和度;f为注水波及系数。
进一步优选的是,在步骤四中,采用气相色谱仪分析化学示踪剂的浓度。所述示踪剂检测限为10-12~10-15。
进一步优选的是,示踪剂注入量为1~2千克,注入时间24~48小时。
进一步优选的是,所述示踪剂配置成水溶液的浓度为25%~75%。
本发明的有益之处在于:
其一、本发明的环保型痕量化学示踪剂作为第四代示踪剂,其主要成分为全氟烷基磺酸盐或全氟烷基羧酸盐;该示踪剂主要优点为:无污染、耐腐蚀、无放射性、无毒、安全环保;用量少,用量在百万分之一到百万分之十之间,或者更低用量;耐受温度高达360℃~550℃,承压最高180MPa;示踪剂只溶于水,不溶于地层及井筒内的其他介质;且生物稳定性及化学稳定性好,可在地层长期有效;品种多,水剂达10多种;痕量元素,检测精度高;现场施工方便。
其二、利用水基痕量化学示踪剂测量注水井井间连通性的方法中,通过化学示踪剂浓度监测,可以了解注水井组油水井的连通情况,界定注水井及周围受益井的注采关系,确定受益井注水水线推进速度及注水波及范围,在注水波及油层范围内渗透率、孔隙度变化及自然裂缝和人工裂缝走向,确定合理注采比,优化注采平衡,示踪剂检测限为10-12~10-15。
附图说明
图1、任446注水井组生产井位图。
图2、任446注水井组示踪剂响应情况。
图3、21注水井组生产井位图。
图4、21注水井组示踪剂响应情况。
具体实施方式
以下结合附图对本发明的优选实施例进行说明,应当理解,此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明。
实施例1
利用本发明的水基痕量化学示踪剂测量注水井井间连通性的方法,测量X油田任446井组注水井组的井间连通性。具体方法为:称取全氟戊基磺酸钠示踪剂(简称WSZ-1)2kg配制成一定浓度的水溶液,加入到注入水中,注入井内;注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度。
X油田任446井组2015年初新投,生产井含水差异大。图1是任446注水井组生产井位图,岩石类型为碳酸盐岩;埋深为3500m;压力为34.8MPa;温度为130℃。
2015年9月初采用井口无泵罐施工,注入WSZ-1示踪剂2kg。注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度,结果见图2。可以看出,该井组见剂时间短7~62d,水驱速度快3~57m/d。示踪开采曲线跨度小,说明峰值陡,裂缝发育,断层不封闭。
实施例2
利用本发明的水基痕量化学示踪剂测量注水井井间连通性的方法,针对X油田21注水井组井间主要目的为确定注入流体推进速度和方向,查明注采连通关系。具体方法为:称取全氟丁基磺酸钠示踪剂(简称WSZ-3)2kg配制成一定浓度的水溶液,加入到注入水中,注入井内;注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度。
X油田21井组2015年初新投,生产井含水差异大。图3是21注水井组生产井位图,岩石类型为碳酸盐岩;埋深为3600m;压力为35MPa;温度为132℃。
X油田21井组2016年7月初采用井口无泵罐施工,注入WSZ-3示踪剂2kg。注入示踪剂一段时间后,在采出井取样,测定示踪剂浓度,结果见图4。可以看出,该井组见剂时间快12~87d,水驱速度快23~147m/d。示踪剂开采曲线跨度小,峰值陡,说明裂缝发育。
综上所述,本发明公开了一种注水井井间监测用环保型痕量化学示踪剂,利用本发明的水基痕量化学示踪剂测量注水井井间连通性的方法,以及利用上述的化学示踪剂测量水井注水井井间连通性的方法,该示踪剂主要优点为:无辐射、无毒、安全环保;用量少,用量在百万分之一到百万分之十之间,或者更低用量;耐受温度高达360℃~550℃,承压最高180MPa;示踪剂只溶于水,不溶于地层及井筒内的其他介质。注水井井间示踪剂测试是为了跟踪注入水的流向,向注水井中注入能够与水相溶的微量示踪剂,然后再用水驱替示踪剂的段塞,从而标记已注入水的运动轨迹,同时在生产井检测示踪剂的开采动态。通过化学示踪剂监测,可以了解注水井组油水井的连通情况,界定注水井及周围受益井的注采关系,确定受益井注水水线推进速度及注水波及范围,在注水波及油层范围内渗透率、孔隙度变化及自然裂缝和人工裂缝走向,确定合理注采比,优化注采平衡。
以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,虽然本发明已以较佳实施例揭露如上,然而并非用以限定本发明,任何熟悉本专业的技术人员,在不脱离本发明技术方案范围内,当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例,但凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的范围内。
Claims (3)
1.全氟烷基羧酸钠或全氟烷基磺酸钠作为水基痕量化学示踪剂的用途,其特征在于:所述示踪剂检测限为10-12~10-15,其中所述全氟烷基磺酸钠为全氟丁基磺酸钠、全氟戊基磺酸钠、全氟己基磺酸钠、全氟庚基磺酸钠、全氟辛基磺酸钠、全氟壬基磺酸钠、全氟癸基磺酸钠、全氟十一烷基磺酸钠、全氟十二烷基磺酸钠、全氟萘磺酸钠、全氟丁基萘磺酸钠、全氟二丁基萘磺酸钠中的一种或多种;所述全氟烷基羧酸钠为全氟丁基羧酸钠、全氟戊基羧酸钠、全氟己基羧酸钠、全氟庚基羧酸钠、全氟辛基羧酸钠、全氟壬基羧酸钠、全氟癸基羧酸钠、全氟十一烷基羧酸钠、全氟十二烷基羧酸钠中的一种或多种。
2.一种利用水基痕量化学示踪剂测量注水井井间连通性的方法,其特征在于,具体包括以下步骤:
步骤一,根据水井需要测试目的选择不同的示踪剂,每种示踪剂均为水基痕量化学示踪剂,且所选的化学示踪剂在地层温度及地层压力下能够保持原来的特性;
步骤二,结合压力、地层岩性条件确定化学示踪剂用量;
步骤三,将示踪剂配制成一定浓度的水溶液,示踪剂水溶液封装于高压柱塞泵的药剂仓内,通过高压柱塞泵加载的方式将示踪剂连续注入到井筒内,将示踪剂全部注入后,卸载注入装置、恢复注水流程;
步骤四,在注水完成后投产时采集注水样品,经过预处理后,分析化学示踪剂的浓度;
步骤五,将浓度随时间的变化得到示踪剂产出曲线,查明注入流体推进方向,确定注采连通关系,查明水淹方向与层位,查明管内、管外、层间窜流及层内绕流;
所述示踪剂全氟烷基羧酸钠或全氟烷基磺酸钠,所述全氟烷基磺酸钠为全氟丁基磺酸钠、全氟戊基磺酸钠、全氟己基磺酸钠、全氟庚基磺酸钠、全氟辛基磺酸钠、全氟壬基磺酸钠、全氟癸基磺酸钠、全氟十一烷基磺酸钠、全氟十二烷基磺酸钠、全氟萘磺酸钠、全氟丁基萘磺酸钠、全氟二丁基萘磺酸钠中的一种或多种;所述全氟烷基羧酸钠为全氟丁基羧酸钠、全氟戊基羧酸钠、全氟己基羧酸钠、全氟庚基羧酸钠、全氟辛基羧酸钠、全氟壬基羧酸钠、全氟癸基羧酸钠、全氟十一烷基羧酸钠、全氟十二烷基羧酸钠中的一种或多种,检测限为10-12~10-15。
3.如权利要求2所述的利用水基痕量化学示踪剂测量注水井井间连通性的方法,其特征在于,示踪剂注入量为1~2千克,注入时间24~48小时。
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