CN106281267A - 一种pH值敏凝胶堵水调剖剂 - Google Patents

一种pH值敏凝胶堵水调剖剂 Download PDF

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CN106281267A
CN106281267A CN201610595014.1A CN201610595014A CN106281267A CN 106281267 A CN106281267 A CN 106281267A CN 201610595014 A CN201610595014 A CN 201610595014A CN 106281267 A CN106281267 A CN 106281267A
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water
profile control
control agent
present
enuatrol
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周万富
王鑫
王力
郭红光
莫爱国
田亮
周泉
周钢
乔岩
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

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Abstract

本发明涉及油田化学领域，特别涉及一种pH值敏凝胶堵水调剖剂。本发明主要解决了传统调剖剂原料成本高、环境适应性差、封堵强度不高，成胶时间和封堵位置不可控的问题。它由疏水改性水溶聚丙烯酰胺、油酸钠、β‑环状糊精和水组成，其重量百分比为：疏水改性水溶聚丙烯酰胺：1.2%‑1.5%，油酸钠：0.3%‑0.7%，β‑环状糊精：0.5%‑0.9%，水：97.2%‑97.3%。本发明可以用作油水同层井选择性堵水剂或水驱井、化学驱井调剖剂，本发明具有高强度封堵，原料成本低；环境适应性强，提高采收率等优点。

Description

一种pH值敏凝胶堵水调剖剂
技术领域
本发明涉及油田化学领域，特别涉及一种凝胶堵水调剖剂。
背景技术
传统的弱凝胶调剖堵水剂，其将部分水解聚丙烯酰胺与酚醛树脂交联，制得的弱凝胶调剖堵水剂吸水膨胀，凝胶强度高，堵油率小，但此类树脂类调剖剂的选择性差，容易造成油层伤害，进而污染地层，影响产能。传统的乳化沥青调剖剂，其以沥青为主含十种组分的调剖剂颗粒可对孔喉半径大于4um的油藏进行调剖，对油流管道伤害较小，但由于大量复杂的无机组分复合导致制得的调剖剂结构不稳定，并且制备工艺复杂，同时由于颗粒较大，调剖半径有限。
中国专利CN103254881公开了一种热致凝胶堵水调剖剂和疏水改性水溶聚丙烯酰胺的制备方法，该调剖剂的调剖半径受限，本专利在疏水改性水溶聚丙烯酰胺的基础上添加油酸钠等物质得到一种PH值敏凝胶堵水调剖剂，调剖剂性能得到增强。传统的膨胀型流动凝胶调剖堵水剂，其将高分子聚丙烯酰胺与硼改性酚醛树脂延迟交联剂混合，制得的膨胀型流动凝胶调剖堵水剂具有高吸水膨胀型和耐温性能，但此类调剖剂环境自适应性较差，耐盐性能有待提高，对油层也有一定伤害。
发明内容
本发明的目的是提供制备方法简单、原料成本低、环境适应性强、封堵强度高，成胶时间和封堵位置可控，能够深度调剖的一种pH值敏凝胶堵水调剖剂。
本发明由疏水改性水溶聚丙烯酰胺、油酸钠、β-环状糊精和水组成，其重量百分比为：疏水改性水溶聚丙烯酰胺：1.2%-1.5%，油酸钠：0.3%-0.7%，β-环状糊精：0.5%-0.9%，水：97.2%-97.3%。
本发明的封堵作用机理：提供的pH值致凝胶堵水调剖剂在地面上呈现溶液态，将其注入地层，利用地层的水稀释和降低整体pH，从而形成凝胶；并且即使将其注入地层后在毛细管孔喉处被剪切破坏，也会由于物理凝胶的环境自适应性质而自我修复，仍然能形成凝胶屏障，从而提高了封堵效率。
本发明与已有技术相比有如下优点：
1).制备方法简单；
2).原料成本低；
3).调剖剂环境适应性强。
附图说明:图1为本发明的凝胶机理示意图；图2为实施例4制备的本发明在不同pH下储能模量和损耗模量的变化图。
具体实施方式：下面结合具体实施例对本发明进一步说明：本发明由疏水改性水溶聚丙烯酰胺、油酸钠、β-环状糊精和水组成，其重量百分比为：疏水改性水溶聚丙烯酰胺：1.2%-1.5%，油酸钠：0.3%-0.7%，β-环状糊精：0.5%-0.9%，水：97.2%-97.3%。
本发明中疏水改性水溶聚丙烯酰胺的分子量为1.0×106 -3.0×106；油酸钠的分子式为C17H33COONa；β-环状糊精的相对分子质量为1135，分子式为C42H70O35.XH2O。
当pH大于9时，阴离子表活剂油酸钠的亲水基亲水性增强，在水中形成大量球形胶束，疏水改性水溶聚丙烯酰胺的疏水侧链段增溶至球形胶束之中，从而使得pH值致凝胶堵水调剖剂在这种pH时的粘度很低；当pH在8-9时，油酸钠在水中的聚集形态改变，油酸钠此时会在水中形成囊泡，大量的球状胶束变成少量囊泡后，多个疏水改性水溶聚丙烯酰胺的疏水链段插入到同一个囊泡中起到交联点的作用，从而使得pH值致凝胶堵水调剖剂的粘度迅速增加，呈现出凝胶的状态；当凝胶状的pH小于8时，油酸钠溶解性进一步变弱，破坏囊泡结构，让聚合物由于疏水链的疏水缔合作用交联起来，形成疏水作用形成的凝胶。整个体系在很高的pH下是粘度很低的水溶液，pH值小于9以后体系形成凝胶，见图1。
本发明的制备方法包括如下步骤：
a. 将阴离子表面活性剂油酸钠C17H33COONa 0.3%-0.7%加水搅拌溶解；
b. 向a中所得溶液中加入疏水改性水溶聚丙烯酰胺1.2%-1.5%搅拌溶解；
c. 向b中所得溶液中加入β-环状糊精0.5%-0.9%，搅拌至完全溶解，即得到本发明。
实施例1：本发明由疏水改性水溶聚丙烯酰胺、油酸钠，β-环状糊精和水组成组成，其组分构成包括：疏水改性水溶聚丙烯酰胺：1.5%，油酸钠：0.5%，β-环状糊精：0.8%，水：97.2%。
实施例2：本发明由疏水改性水溶聚丙烯酰胺、油酸钠，β-环状糊精和水组成组成，其组分构成包括：疏水改性水溶聚丙烯酰胺：1.4%，油酸钠：0.6%，β-环状糊精：0.8%，水：97.2%。
实施例3：本发明由疏水改性水溶聚丙烯酰胺、油酸钠，β-环状糊精和水组成组成，其组分构成包括：疏水改性水溶聚丙烯酰胺：1.3%，油酸钠：0.7%，β-环状糊精：0.8%，水：97.2%。
实施例4：本发明由疏水改性水溶聚丙烯酰胺、油酸钠，β-环状糊精和水组成组成，其组分构成包括：疏水改性水溶聚丙烯酰胺：1.2%，油酸钠：0.7%，β-环状糊精：0.9%，水：97.2%。
该实施例制备的pH值敏凝胶堵水调剖剂，采用美国TA公司生产的AR-G2型多功能流变仪测试T1的储能模量和损耗模量随pH变化图，测试使用同轴圆筒测试体系：圆筒内径15mm，转子直径为14mm，圆筒深度为42mm；测试参数为：角速度ω为10-2-102rad/s 扫描，应力值为0.6Pa，温度为25℃。如图所示，当体系pH在9时，损耗模量比储能模量高，意味着体系表现出典型的液体特征；随着pH值变小，储能模量和损耗模量增加；当体系pH到8时，储能模量大于损耗模量，具有类固体的特征，以上说明T1在pH=8下具有较高的弹性模量，能够满足现场工业使用，见图2。

Claims (1)

1.一种pH值敏凝胶堵水调剖剂，其特征在于：它由疏水改性水溶聚丙烯酰胺、油酸钠、β-环状糊精和水组成，其重量百分比为：疏水改性水溶聚丙烯酰胺：1.2%-1.5%，油酸钠：0.3%-0.7%，β-环状糊精：0.5%-0.9%，水：97.2%-97.3%。
CN201610595014.1A 2016-07-26 2016-07-26 一种pH值敏凝胶堵水调剖剂 Pending CN106281267A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2019091092A1 (zh) * 2017-11-10 2019-05-16 中国石油大学(华东) 一种适用于油井水泥浆的pH敏感性吸水树脂及其应用
CN112780219A (zh) * 2021-02-24 2021-05-11 西南石油大学 一种靶向释放堵水剂

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CN102030851A (zh) * 2009-09-25 2011-04-27 中国石油化工股份有限公司 一种改性聚丙烯酰胺及其制备方法
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CN102030851A (zh) * 2009-09-25 2011-04-27 中国石油化工股份有限公司 一种改性聚丙烯酰胺及其制备方法
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019091092A1 (zh) * 2017-11-10 2019-05-16 中国石油大学(华东) 一种适用于油井水泥浆的pH敏感性吸水树脂及其应用
US11136490B2 (en) 2017-11-10 2021-10-05 China University Of Petroleum (East China) PH sensitive water-absorbent resin suitable for oil well cement slurry and application thereof
CN112780219A (zh) * 2021-02-24 2021-05-11 西南石油大学 一种靶向释放堵水剂

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