CN108005641B - 一种油基痕量化学示踪剂及用于评价水平井各段产油贡献率的方法 - Google Patents
一种油基痕量化学示踪剂及用于评价水平井各段产油贡献率的方法 Download PDFInfo
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Abstract
本发明公开了一种油基痕量化学示踪剂及用于评价水平井各段产油贡献率的方法,该示踪剂的组分包括全氟烷酸甲酯或全氟烷基乙基丙烯酸酯。该示踪剂定量评价水平井各段产油贡献率的方法:将定量的不同种类的示踪剂添加到不同井段的压裂液中,每段使用一种示踪剂,示踪剂随前置液进入地层与油乳化作用;压裂后排液,在井口定期取样,测定样品中化学示踪剂的浓度;根据化学示踪剂浓度随时间的变化作图,得到示踪剂产出曲线,通过对实测的若干个示踪剂产出浓度值进行拟合计算,再根据现场测试的总产量可求得各段产油的贡献量。本发明的示踪剂无辐射、无毒、生物稳定性和化学稳定性好,用量少,只溶于指定的油相,不溶于地层及井筒内的其他介质。
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油基痕量化学示踪剂用于评价水平井各段产油贡献率的方法。
背景技术
页岩气因储藏方式不同,开采技术要求也不相同,水平井和分段压裂是油气开发中最关键的技术,也是最难的技术。水平井,就相当于在地底下给页岩气开凿出水平方向的“隧道”。如何使散存于“毛细血管”中的天然气汇集到井中涌出,这就要用到开采中的一个关键技术“压裂”,即将水平井四周地层约三百米范围内压得粉碎,好使油气体汇集到井中。在长达几千米的地下,既要保持井孔完好以便顺利出油气,又要使周围岩层粉碎出油气,是高难度的技术工作。水力压裂施工中油气井是分阶段进行,但每段的贡献量却很难确定。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。国内还没有比较成熟的技术来确定每段的贡献量。因此亟需开发低成本的化学示踪剂技术,进行产量分段测试,得到每口井的甜点分布,为后续重复压裂提供有效依据。
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低成本的化学示踪剂,解决现有的示踪剂监测可靠性差,监测数据准确大,用量大,成本高,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采用上述化学示踪剂评价水平井各段产油贡献率的方法,样品中示踪剂浓度检测快速,灵敏度高,数据重现性好,准确度高。
为了实现本发明这些目的和其它优点,本发明提供了一种油基痕量化学示踪剂,该示踪剂的组分包括全氟烷酸甲酯或全氟烷基乙基丙烯酸酯,示踪剂在50℃~150℃条件下在水中的溶解度小于0.001g。
优选的是,所述全氟烷酸甲酯包括但不限于全氟甲酸甲酯、全氟乙酸甲酯、全氟丙酸甲酯、全氟丁酸甲酯、全氟戊酸甲酯、全氟己酸甲酯、全氟庚酸甲酯、全氟辛酸甲酯、全氟壬酸甲酯、全氟癸酸甲酯、全氟十一酸甲酯、全氟十二酸甲酯、全氟十三酸甲酯、全氟十四酸甲酯、全氟十五酸甲酯、全氟十六酸甲酯中的至少一种。
优选的是,所述全氟烷基乙基丙烯酸酯包括但不限于全氟甲基乙基丙烯酸酯、全氟乙烷基乙基丙烯酸酯、全氟丙烷基乙基丙烯酸酯、全氟丁烷基乙基丙烯酸酯、全氟戊烷基乙基丙烯酸酯、全氟己烷基乙基丙烯酸酯、全氟庚烷基乙基丙烯酸酯、全氟辛烷基乙基丙烯酸酯、全氟壬烷基乙基丙烯酸酯、全氟癸烷基乙基丙烯酸酯、全氟十一烷基乙基丙烯酸酯、全氟十二烷基乙基丙烯酸酯中的至少一种。
优选的是,该示踪剂在常温下是液体。
一种采用上述化学示踪剂定量评价水平井各段产油贡献率的方法,包括以下步骤:
S1、示踪剂选择
根据水平井需要测试的段数选择不同的示踪剂,每一段选取一种化学示踪剂,并结合压力、地层岩性条件及单段产能确定化学示踪剂用量;
S2、示踪剂的泵注
将定量的不同种类的示踪剂分别泵入不同井段的压裂前置液中,每段压裂前置液中加入一种化学示踪剂,化学示踪剂随前置液进入地层遇到油后迅速扩张到油相中;
S3、现场采样
压裂后排液,井口定期取样,测定样品中化学示踪剂的浓度;
S4、数据处理
根据化学示踪剂浓度随时间的变化作图,得到示踪剂产出曲线,通过对实测的若干个示踪剂产出浓度值进行拟合计算,再根据现场测试的总产量可求得各段产油的贡献量。
优选的是,所述步骤S2中,示踪剂的注入装置为微型柱塞计量泵,每段注入量为200~500克。
优选的是,所述步骤S3中,在井口取样25毫升,样品经过预处理后,用液相色谱仪分析化学示踪剂的浓度。
优选的是,所述步骤S1中,化学示踪剂用量的计算公式为:
M=100*Kp*T*3.14*R2,
式中:M—示踪剂用量,kg;Kp—地层孔隙度,%;T—示踪剂的最小示踪度,R—最大产能半径,m。
在分层(段)多级压裂过程中,充分利用微量物质示踪剂种类多以及检测便捷的优势,针对不同层段,选择不同种类、不同用量的示踪剂,跟随压裂液一同注入相应层段。压裂过程结束后,在一段时间内对井口返排液的中示踪剂浓度进行检测、对比和分析,可得到改造后各级压裂层段的压裂效果及流体动态相关信息。首先根据监测压裂井相关储层流体的分析资料,选择出某种合适的多种微量物质示踪剂,根据压裂程序,将各种不同微量物质示踪剂加入不同层段压裂液中,井口取样分析返排液中示踪剂浓度的变化,然后通过累积示踪剂的量和返排体积判断出返排情况,就能够定性和定量分析目标层的返排液,进而了解每一层压裂后的效果,从井间示踪角度,给出压裂渗流通道先主缝、后微缝为主、渗流通道特征、示踪剂回采率等情况的具体解释描述。为形成有效的微缝和小缝网络,有利于地层流体流出和提高产油量。
本发明的有益之处在于:
其一、该示踪剂只溶于指定的油相,不溶于地层及井筒内的任何介质,且示踪剂无辐射、无毒无害,不与其他元素发生化学反应,生物稳定性和化学稳定性好;
其二、示踪剂用量少,为百万分之一或更低;
其三、耐高温,最高达360℃,耐高压,最高承压25Kpsi;
其四、采用液相色谱仪测定样品中示踪剂浓度检测,速度快,灵敏度高,数据重现性好,准确度高,加上适当的检测手段,可以实现的检测精度达到ppb级。
附图说明
图1、1X致密油水平井排液1~3天测量数据图。
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
1X致密油水平井产液评价,具体方法步骤如下:
(1)示踪剂选择
采用本发明的痕量油基示踪剂5种,OST-1全氟甲酸甲酯、OST-2全氟乙酸甲酯、OST-3全氟丙酸甲酯、OST-4全氟甲基乙基丙烯酸酯、OST-5全氟乙烷基乙基丙烯酸酯,该示踪剂与油具有高吸附度,但不溶于水。对5级压裂后的各段产油测量,每段选择一种示踪剂,示踪剂随着压裂液进入地层后与油接触,立即分散到油相中。排液时取样,实验室测量该示踪剂的含量,确定每段产油贡献率。
(2)示踪剂的泵注
针对水平井套管完井进行分段压裂,将已知定量的不同种类的示踪剂分别泵入不同井段的压裂前置液中,每段压裂前置液中加入一种化学示踪剂,化学示踪剂随前置液进入地层与油乳化作用。
(3)现场采样
压裂后排液,井口定期取样25毫升。送实验室分析,所有样品须准确标注取样时间,地点及井号,取样时要求甲方人员在场。
(4)检测结果
根据化学示踪剂浓度随时间的变化作图,得到示踪剂产出曲线,通过对实测的若干个示踪剂产出浓度值进行拟合计算,再根据现场测试的总产量可求得各段产油的贡献量。
图1为1X致密油水平井排液1~3天测量数据图。初期分析显示,靠近A点(进入水平段拐点)和B点的两段产量贡献有限,中段产油贡献明显。
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 (5)
1.全氟烷酸甲酯或全氟烷基乙基丙烯酸酯作为油基痕量化学示踪剂的用途,所述示踪剂在50℃~150℃条件下在水中的溶解度小于0.001g,所述全氟烷酸甲酯为全氟甲酸甲酯、全氟乙酸甲酯、全氟丙酸甲酯、全氟丁酸甲酯、全氟戊酸甲酯、全氟己酸甲酯、全氟庚酸甲酯、全氟辛酸甲酯、全氟壬酸甲酯、全氟癸酸甲酯、全氟十一酸甲酯、全氟十二酸甲酯、全氟十三酸甲酯、全氟十四酸甲酯、全氟十五酸甲酯、全氟十六酸甲酯中的至少一种;所述全氟烷基乙基丙烯酸酯为全氟甲基乙基丙烯酸酯、全氟乙烷基乙基丙烯酸酯、全氟丙烷基乙基丙烯酸酯、全氟丁烷基乙基丙烯酸酯、全氟戊烷基乙基丙烯酸酯、全氟己烷基乙基丙烯酸酯、全氟庚烷基乙基丙烯酸酯、全氟辛烷基乙基丙烯酸酯、全氟壬烷基乙基丙烯酸酯、全氟癸烷基乙基丙烯酸酯、全氟十一烷基乙基丙烯酸酯、全氟十二烷基乙基丙烯酸酯中的至少一种。
2.一种采用油基痕量化学示踪剂定量评价水平井各段产油贡献率的方法,其特征在于,包括以下步骤:
S1、示踪剂选择
根据水平井需要测试的段数选择不同的示踪剂,每一段选取一种化学示踪剂,并结合压力、地层岩性条件及单段产能确定化学示踪剂用量,化学示踪剂用量的计算公式为:
M=100*Kp*T*3.14*R2,
式中:M—示踪剂用量,kg;Kp—地层孔隙度,%;T—示踪剂的最小示踪度,R—最大产能半径,m;
所述的油基痕量化学示踪剂为全氟烷酸甲酯或全氟烷基乙基丙烯酸酯;所述全氟烷酸甲酯为全氟甲酸甲酯、全氟乙酸甲酯、全氟丙酸甲酯、全氟丁酸甲酯、全氟戊酸甲酯、全氟己酸甲酯、全氟庚酸甲酯、全氟辛酸甲酯、全氟壬酸甲酯、全氟癸酸甲酯、全氟十一酸甲酯、全氟十二酸甲酯、全氟十三酸甲酯、全氟十四酸甲酯、全氟十五酸甲酯、全氟十六酸甲酯中的至少一种;所述全氟烷基乙基丙烯酸酯为全氟甲基乙基丙烯酸酯、全氟乙烷基乙基丙烯酸酯、全氟丙烷基乙基丙烯酸酯、全氟丁烷基乙基丙烯酸酯、全氟戊烷基乙基丙烯酸酯、全氟己烷基乙基丙烯酸酯、全氟庚烷基乙基丙烯酸酯、全氟辛烷基乙基丙烯酸酯、全氟壬烷基乙基丙烯酸酯、全氟癸烷基乙基丙烯酸酯、全氟十一烷基乙基丙烯酸酯、全氟十二烷基乙基丙烯酸酯中的至少一种;
S2、示踪剂的泵注
将定量的不同种类的示踪剂分别泵入不同井段的压裂前置液中,每段压裂前置液中加入一种化学示踪剂,化学示踪剂随前置液进入地层与油乳化作用;
S3、现场采样
压裂后排液,井口定期取样,测定样品中化学示踪剂的浓度;
S4、数据处理
根据化学示踪剂浓度随时间的变化作图,得到示踪剂产出曲线,通过对实测的若干个示踪剂产出浓度值进行拟合计算,再根据现场测试的总产量求得各段产油的贡献量。
3.如权利要求2所述的一种采用油基痕量化学示踪剂定量评价水平井各段产油贡献率的方法,其特征在于,所述步骤S2中,示踪剂的注入装置为微型柱塞计量泵。
4.如权利要求3所述的一种采用油基痕量化学示踪剂定量评价水平井各段产油贡献率的方法,其特征在于,所述步骤S2中,每段注入量为200~500克。
5.如权利要求4所述的一种采用油基痕量化学示踪剂定量评价水平井各段产油贡献率的方法,其特征在于,所述步骤S3中,在井口取样25毫升,样品经过预处理后,用液相色谱仪分析化学示踪剂的浓度。
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