CN112358858B - 水平井定位堵水用结构记忆材料 - Google Patents
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Abstract
本发明提供了一种水平井定位堵水用结构记忆材料，其由骨架材料、主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂以及水组成；其重量百分比组成为：骨架材料占5至10％，主剂占5至10％，胶凝剂占0.01至0.05％，引发剂占0.01至0.05％，脱水抑制剂占0.1至1％，酸碱调节剂占0.1至0.5％，余量为水；按照配比将主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂放入水中，在常温条件下搅拌混合至完全溶解；再将骨架材料加入该混合溶液中继续在常温下搅拌10至20min，即得到成品；该材料结构记忆能力强，剪切后短时间内(＜30s)可恢复结构强度，成胶时间在2至8h范围内可控，成胶后材料强度高于70N，70℃下老化三个月没有脱水现象，能够有效治理水平井的出水问题，使用效果理想。
Description
技术领域
本发明涉及一种水平井定位堵水用结构记忆材料。
背景技术
水平井相对于垂直井来说，具有采油指数高、生产压差低、无水采油期长等优势，但是随着开发时间的延长，水平井见水后含水率迅速上升，产油量急剧下降，一些水平井甚至刚投产就见水，严重影响水平井的开发效果。水平井完井方式主要有三种，即射孔完井、割缝衬管(或者筛管)完井和裸眼完井。受成本以及技术因素的影响，目前主要采用管外无封隔器的筛管完井方式，国内该类完井方式占70％，国外则达到90％。由于水从横向、径向进入井内，同时由于井径不规则，所以对筛管完井的水平井实施有效堵水难度极大。
针对筛管完井的水平井出水情况，矿场实施的堵水方法主要有：(1)机械管柱法：机械管柱法主要针对射孔完井或筛管与地层间具有良好封隔的采用膨胀式封隔器完井的井段，其实施范围具有一定的局限性。对于割缝衬管的完井方式，机械管柱法则无法实现衬管与地层之间环空的分隔与封堵，层内出水仍会以横向流的方式产出，因此，机械管柱的方法受到限制。(2)化学剂笼统注入法：该方法是将相对渗透率调整剂(或堵剂)笼统注入所有层段，以控制被处理流体或次生流体的流度。笼统注入技术具有堵剂使用量大的缺点，而且可能会对产层造成伤害。(3)精确定位堵水法：该技术借助连续油管和封隔器，在出水点注入可完整充填筛管/井壁环空的结构记忆材料，由此形成的高强度阻流环有效隔离环空区域，起到对出水点定向封堵的作用。
基于精确定位堵水法的技术特点，堵水材料应具有完整充填环空的能力，即结构记忆特性：材料原生状态下为膏状体，注入过程中结构破坏呈流体状态，进入环空后结构重建恢复为膏状体，迅速在环空中形成完整充填。目前经调研，未发现有定位堵水用结构记忆材料。
发明内容
本发明目的在于提供一种水平井定位堵水用结构记忆材料,以解决水平井定位堵水的技术问题。
为实现上述目的，本发明的水平井定位堵水用结构记忆材料的具体技术方案如下：
一种水平井定位堵水用结构记忆材料，其由骨架材料、主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂以及水组成；其重量百分比组成为：骨架材料占5至10％，主剂占5至10％，胶凝剂占0.01至0.05％，引发剂占0.01至0.05％，脱水抑制剂占0.1至1％，酸碱调节剂占0.1至0.5％，余量为水。
前述的水平井定位堵水用结构记忆材料，其中，
所述骨架材料为羧甲基纤维素钠及羟乙基纤维素复配物；羧甲基纤维素钠与羟乙基纤维素复配物的重量份数比为：5:1至10:1；
所述主剂为丙烯酰胺及甲基丙烯酸甲酯复配物；丙烯酰胺及甲基丙烯酸甲酯复配物的重量份数比为：1:1至3:1；
所述胶凝剂为N,N-亚甲基双丙烯酰胺；
所述引发剂为过硫酸铵；
所述脱水抑制剂为二氧化钛纳米颗粒及氨基硅烷偶联剂复配物；二氧化钛纳米颗粒及氨基硅烷偶联剂复配物的重量份数比为：1:1至3:1；
所述酸碱调节剂为焦磷酸钠；
所述水为自来水、纯净水或者蒸馏水。
本发明水平井定位堵水用结构记忆材料的制备方法，其按照配比将主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂放入水中，在常温条件下搅拌混合至完全溶解；再将骨架材料加入该混合溶液中继续在常温下搅拌10至20min，即得到成品。
前述的水平井定位堵水用结构记忆材料，其中，所述骨架材料、主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂以及水的重量百分比组成为：骨架材料占5至10％，主剂占5至10％，胶凝剂占0.01至0.05％，引发剂占0.01至0.05％，脱水抑制剂占0.1至1％，酸碱调节剂占0.1至0.5％，余量为水。
前述的水平井定位堵水用结构记忆材料，其中，
所述骨架材料为羧甲基纤维素钠及羟乙基纤维素复配物；羧甲基纤维素钠与羟乙基纤维素复配物的重量份数比为：5:1至10:1；
所述主剂为丙烯酰胺及甲基丙烯酸甲酯复配物；丙烯酰胺及甲基丙烯酸甲酯复配物的重量份数比为：1:1至3:1；
所述胶凝剂为N,N-亚甲基双丙烯酰胺；
所述引发剂为过硫酸铵；
所述脱水抑制剂为二氧化钛纳米颗粒及氨基硅烷偶联剂复配物；二氧化钛纳米颗粒及氨基硅烷偶联剂复配物的重量份数比为：1:1至3:1；
所述酸碱调节剂为焦磷酸钠；
所述水为自来水、纯净水或者蒸馏水。
本发明的水平井定位堵水用结构记忆材料具有以下优点：该材料结构记忆能力强，剪切后短时间内(＜30s)可恢复结构强度，成胶时间在2至8h范围内可控，成胶后材料强度高于70N，70℃下老化3个月没有脱水现象，能够有效治理水平井的出水问题。
具体实施方式
为了更好地了解本发明的目的、结构及功能，对本发明一种水平井定位堵水用结构记忆材料做进一步详细的描述。
实施例1：
常温下，在87.0g自来水中加入3g丙烯酰胺、3g甲基丙烯酸甲酯、0.05g N,N-亚甲基双丙烯酰胺、0.05g过硫酸铵、0.2g氨基硅烷、0.6g二氧化钛纳米颗粒、0.1g焦磷酸钠，搅拌均匀，使其充分溶解，再将5g羧甲基纤维素钠、1g羟乙基纤维素加入上述混合液中搅拌10min，即得到结构记忆材料。该材料初始强度为0.11N，剪切时材料强度降至0.01N以下，剪切后24s即可恢复初始强度，材料成胶时间为8h，材料成胶后强度为77.56N，70℃下老化3个月没有脱水现象。
实施例2：
常温下，在82.3g自来水中加入6g丙烯酰胺、2g甲基丙烯酸甲酯、0.05g N,N-亚甲基双丙烯酰胺、0.05g过硫酸铵、0.1g氨基硅烷、0.2g二氧化钛纳米颗粒、0.3g焦磷酸钠，搅拌均匀，使其充分溶解，再将8g羧甲基纤维素钠、1g羟乙基纤维素加入上述混合液中搅拌10min，即得到结构记忆材料。该材料初始强度为0.15N，剪切时材料强度降至0.01N以下，剪切后14s即可恢复初始强度，材料成胶时间为6h，材料成胶后强度为74.85N，70℃下老化3个月没有脱水现象。
实施例3：
常温下，在84.0g自来水中加入4g丙烯酰胺、2g甲基丙烯酸甲酯、0.05g N,N-亚甲基双丙烯酰胺、0.05g过硫酸铵、0.2g氨基硅烷、0.4g二氧化钛纳米颗粒、0.3g焦磷酸钠，搅拌均匀，使其充分溶解，再将8g羧甲基纤维素钠、1g羟乙基纤维素加入上述混合液中搅拌10min，即得到结构记忆材料。该材料初始强度为0.12N，剪切时材料强度降至0.01N以下，剪切后17s即可恢复初始强度，材料成胶时间为2h，材料成胶后强度为81.42N，70℃下老化3个月没有脱水现象。
本发明水平井定位堵水用结构记忆材料结构记忆能力强，剪切后短时间内(＜30s)可恢复结构强度，成胶时间在2至8h范围内可控，成胶后材料强度高于70N，70℃下老化三个月没有脱水现象，将其应用在水平井定位堵水工艺中，可对筛管完井的水平井实施有效堵水，能够有效治理水平井的出水问题，使用效果理想。
本发明实施例中未进行说明的内容为现有技术，故，不再进行赘述。
本发明的水平井定位堵水用结构记忆材料的有益效果是：
1、该材料具有结构记忆特性，其原理是材料具有以相互作用形成的亚稳态功能性结构在剪切时受到破坏、在外力消除后功能性结构重构的性质。该材料中所使用的骨架材料及主剂分子结构中富含羧基、羟基、酰胺基等活性基团，这些活性基团相互之间会形成大量的氢键，使得材料在静止状态下呈现膏状体；当材料在注入流动过程中遭受外力剪切时，不稳定的氢键受到破坏，材料变稀成为流体态；材料进入水平井环空后外力消除，活性基团间的氢键迅速重构再次呈现膏状体，流动性变差，受重力作用影响较小，因此可将环空完全充填，不会出现环空下部有充填而上部无充填的现象。
2、本发明所使用的羧甲基纤维素钠及羟乙基纤维素分子结构中含有大量的羧基、羟基等极性基团，具有良好的亲水性，常温搅拌10min左右即可获得均匀的膏状体，而淀粉、纤维素等普通聚多糖一般需要在高温(≥50℃)下搅拌20min以上才能形成形状较好的膏状体。因此，羧甲基纤维素钠及羟乙基纤维素的使用有利于简化油田现场的施工程序，提高作业效率。
3、本发明所使用的二氧化钛纳米颗粒可与氨基硅烷偶联在一起，形成鱼网状结构，该结构可与丙烯酰胺/N,N-亚甲基双丙烯酰胺形成的交联网格形成交叉互穿结构，因而最终形成的封堵材料结构均匀致密，材料具有更强的持水能力，因此材料耐温抗脱水能力性能优异。
可以理解，本发明是通过一些实施例进行描述的，本领域技术人员知悉的，在不脱离本发明的精神和范围的情况下，可以对这些特征和实施例进行各种改变或等效替换。另外，在本发明的教导下，可以对这些特征和实施例进行修改以适应具体的情况及材料而不会脱离本发明的精神和范围。因此，本发明不受此处所公开的具体实施例的限制，所有落入本申请的权利要求范围内的实施例都属于本发明所保护的范围内。
Claims (4)
1.一种水平井定位堵水用结构记忆材料，其特征在于，由骨架材料、主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂以及水组成；其重量百分比组成为：骨架材料占5至10％，主剂占5至10％，胶凝剂占0.01至0.05％，引发剂占0.01至0.05％，脱水抑制剂占0.1至1％，酸碱调节剂占0.1至0.5％，余量为水；
所述骨架材料为羧甲基纤维素钠及羟乙基纤维素复配物；羧甲基纤维素钠与羟乙基纤维素复配物的重量份数比为：5:1至10:1；
所述主剂为丙烯酰胺及甲基丙烯酸甲酯复配物；丙烯酰胺及甲基丙烯酸甲酯复配物的重量份数比为：1:1至3:1；
所述胶凝剂为N,N-亚甲基双丙烯酰胺；
所述引发剂为过硫酸铵；
所述脱水抑制剂为二氧化钛纳米颗粒及氨基硅烷偶联剂复配物；二氧化钛纳米颗粒及氨基硅烷偶联剂复配物的重量份数比为：1:1至3:1；
所述酸碱调节剂为焦磷酸钠；
所述水为自来水、纯净水或者蒸馏水。
2.一种如权利要求1所述的水平井定位堵水用结构记忆材料的制备方法，其特征在于，按照配比将主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂放入水中，在常温条件下搅拌混合至完全溶解；再将骨架材料加入该混合溶液中继续在常温下搅拌10至20min，即得到成品。
3.根据权利要求2所述的水平井定位堵水用结构记忆材料的制备方法，其特征在于，所述骨架材料、主剂、胶凝剂、引发剂、脱水抑制剂、酸碱调节剂以及水的重量百分比组成为：骨架材料占5至10％，主剂占5至10％，胶凝剂占0.01至0.05％，引发剂占0.01至0.05％，脱水抑制剂占0.1至1％，酸碱调节剂占0.1至0.5％，余量为水。
4.根据权利要求2所述的水平井定位堵水用结构记忆材料的制备方法，其特征在于，
所述骨架材料为羧甲基纤维素钠及羟乙基纤维素复配物；羧甲基纤维素钠与羟乙基纤维素复配物的重量份数比为：5:1至10:1；
所述主剂为丙烯酰胺及甲基丙烯酸甲酯复配物；丙烯酰胺及甲基丙烯酸甲酯复配物的重量份数比为：1:1至3:1；
所述胶凝剂为N,N-亚甲基双丙烯酰胺；
所述引发剂为过硫酸铵；
所述脱水抑制剂为二氧化钛纳米颗粒及氨基硅烷偶联剂复配物；二氧化钛纳米颗粒及氨基硅烷偶联剂复配物的重量份数比为：1:1至3:1；
所述酸碱调节剂为焦磷酸钠；
所述水为自来水、纯净水或者蒸馏水。
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