CN111825806A - 钻井液用成膜剂及其制备方法和应用 - Google Patents
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Abstract
本发明属于钻井液技术领域,尤其涉及钻井液用成膜剂及其制备方法和应用。该成膜剂由包括如下重量份数的原料制备而得:异佛尔酮二异氰酸酯20‑30份、聚己内酯20‑30份、扩链剂5‑10份、丙烯酸单体20‑30份、2‑丙烯酰胺基‑2‑甲基丙磺酸8‑15份、助溶剂5‑10份、引发剂1‑5份、去离子水20‑30份。该成膜剂主要用于页岩气钻井中,不仅能够吸附在粘土表面抑制其水化,还可以吸附在岩石表面自发聚合形成一层聚合物膜,起到封堵泥页岩微孔隙和微裂缝,降低次生裂缝发育以及钻井液压力传递的作用。同时,该膜状物阻止钻井液中的固相和液相侵入储层,达到保护储层的目的。
Description
技术领域
本发明属于钻井液技术领域,尤其涉及钻井液用成膜剂及其制备方法和应用。
背景技术
随着钻井技术的日益发展,超深井、水平井、大位移井等高难度井越来越成为油气钻探的主要研究方向。如近年来逐渐兴起的页岩气钻探,其主要以吸附和游离状态赋存于富含有机质页岩、泥岩中,与传统的煤层气以吸附状态赋存于煤层中有所不同。此外,页岩气的开发相对于煤层气埋藏更深,更复杂,且钻探难度较大,其主要以大位移井,水平井为主,而由于地层倾角大,且褶皱、断层多,地层比较破碎,暗色页岩地层本身极易出现水化膨胀垮塌,且地层本身具有微裂缝发育的特点,易发生毛细管自吸附作用引来的外来液相侵入,进而导致活度变化引起的膨胀垮塌等井下复杂情况。
为避免钻井过程中产生上述问题,现有钻井液常采用封堵剂,封堵剂主要是各种不同颗粒的固体颗粒进行匹配,对微裂缝进行暂堵,达到暂时封堵微裂缝的目的,然而,长时间后脱落导致封堵失败,且不可阻止水分子进入泥页岩,从而导致泥页岩水化膨胀,导致井壁失稳。
发明内容
本发明提出的成膜剂,不仅能够吸附在粘土表面抑制其水化,还可以吸附在岩石表面自发聚合形成一层聚合物膜,起到封堵泥页岩微孔隙和微裂缝,降低次生裂缝发育以及钻井液压力传递的作用。
本发明提出一种钻井液用成膜剂,由包括如下重量份数的原料制备而得:异佛尔酮二异氰酸酯20-30份、聚己内酯20-30份、扩链剂5-10份、丙烯酸单体20-30份、2-丙烯酰胺基-2-甲基丙磺酸8-15份、助溶剂5-10份、引发剂1-5份、去离子水20-30份。
进一步地,所述丙烯酸单体包括丙烯酸β-羟乙酯、丙烯酸丁酯、丙烯酸甲酯、甲基丙烯酸甲酯、丙烯酸十八碳酯中至少一种。
进一步地,所述引发剂包括过硫酸钾,偶氮二异丁基脒盐酸盐,偶氮二异丁咪唑啉盐酸盐中至少一种。
进一步地,所述扩链剂包括二羟甲基丙酸(DMPA)、1,4-丁二醇(BDO)中至少一种。
进一步地,所述助溶剂包括乙二醇单丁醚、异丙醇中至少一种。
本发明还提出上述的钻井液用成膜剂的制备方法,包括如下步骤:
将聚己内酯加入反应釜中,120℃真空脱水2h,降温到80℃后;
加入异佛尔酮二异氰酸酯(IPDI),助溶剂,反应3h降温至70℃后;
加入扩链剂,反应2h后,降温至60℃反应1.5h,降温到40℃后;
加入丙烯酸单体、2-丙烯酰胺基-2-甲基丙磺酸,搅拌0.5h;
加入去离子水高速乳化分散后,加入引发剂,80℃自由基聚合3.5h,冷却出料,得成膜剂。
本发明还提出上述的钻井液用成膜剂在页岩气钻井中的应用。
本发明具有以下优势:
本发明所提出的成膜剂不仅能够吸附在粘土表面抑制其水化,还可以吸附在岩石表面自发聚合形成一层聚合物膜,起到封堵泥页岩微孔隙和微裂缝,降低次生裂缝发育以及钻井液压力传递的作用。同时,该膜状物阻止钻井液中的固相和液相侵入储层,抑制泥页岩水化膨胀,达到保护储层的目的。该钻井液用成膜剂可用于页岩气钻井中,具有较好的成膜效果。
附图说明
构成本发明的一部分的附图用来提供对本发明的进一步理解,本发明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。
在附图中:
图1为本发明实施例1成膜剂在滤纸表面成膜前后扫描电镜照片;
其中,图1(a)为滤纸表面扫描电镜照片,图1(b)为成膜剂在滤纸表面成膜后。
图2为本发明实施例1成膜剂在滤纸侧面成膜前后扫描电镜照片;
其中,图2(a)为滤纸侧面扫描电镜照片,图2(b)为成膜剂在滤纸侧面成膜后。
图3为本发明实施例1成膜剂在砂石表面成膜前后扫描电镜照片;
其中,图3(a)为砂石表面,图3(b)为成膜剂在砂石表面成膜后。
具体实施方式
需要说明的是,在不冲突的情况下,本发明中的实施例及实施例中的特征可以相互组合。
本发明一实施例提出一种钻井液用成膜剂,由包括如下重量份数的原料制备而得:异佛尔酮二异氰酸酯(IPDI)20-30份、聚己内酯20-30份、扩链剂5-10份、丙烯酸单体20-30份、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)8-15份、助溶剂5-10份、引发剂1-5份、去离子水20-30份。
本发明实施例采用IPDI、聚己内酯、丙烯酸单体作为主要组分,与AMPS、扩链剂等助剂共同作用制备得到成膜剂。该成膜剂可在岩心表面形成类似化学“封固壳”的薄膜,可以封堵微裂缝。且该成膜剂结构较小,可进入泥页岩孔隙,强烈吸附或与泥页岩发生化学反应,形成胶结力很大的物质,使粘土等矿物颗粒凝结成牢固整体。可以阻止水及钻井液滤液进入地层,抑制泥页岩水化膨胀,达到保护储层的目的。同时,本发明实施例中的成膜剂可实现破胶,达到提高后期排采的目的。
本发明一实施例中,所述丙烯酸单体包括丙烯酸β-羟乙酯(HEMA)、丙烯酸丁酯(BA)、丙烯酸甲酯(MA)、甲基丙烯酸甲酯(MMA)、丙烯酸十八碳酯中至少一种。
本发明一实施例中,所述引发剂包括过硫酸钾,偶氮二异丁基脒盐酸盐,偶氮二异丁咪唑啉盐酸盐中至少一种。
本发明一实施例中,所述扩链剂包括二羟甲基丙酸(DMPA)、1,4-丁二醇(BDO)中至少一种。
本发明一实施例中,所述助溶剂包括乙二醇单丁醚、异丙醇中至少一种。
本发明一实施例中,聚己内酯的分子量为10000-20000。
本发明一实施例还提出上述钻井液用成膜剂的制备方法,包括如下步骤:
将聚己内酯加入反应釜中,120℃真空脱水2h,降温到80℃后;
加入异佛尔酮二异氰酸酯(IPDI),助溶剂,反应3h降温至70℃后;
加入扩链剂,反应2h后,降温至60℃反应1.5h,降温到40℃后;
加入丙烯酸单体、2-丙烯酰胺基-2-甲基丙磺酸搅拌0.5h;
加入去离子水高速乳化分散后,加入水溶后的引发剂,80℃自由基聚合3.5h,冷却出料,得成膜剂。本发明实施例中所述成膜剂为乳白色黏稠流动液体。所述引发剂以水溶液的形式添加。
本发明一实施例中,所述扩链剂为经干燥脱水处理的扩链剂。
本发明一实施例还提出上述钻井液用成膜剂在页岩气和煤层气钻井中的应用。本发明所得成膜剂可用于不仅可以用于煤层气,还可以用于页岩气。相对而言,页岩气的开发相对于煤层气埋藏更深,更复杂,且钻探难度较大。现有技术中钻井液主要用于煤层气钻井,而本申请所提出的钻井液用成膜剂,在页岩气钻井中具有较好的成膜效果。
下面将结合实施例详细阐述本发明。
实施例1一种钻井液用成膜剂的制备方法,包括如下步骤:
称取20份的聚己内酯(分子量为15000)于反应釜中,120℃真空脱水2h,降温到80℃后;
加入20份的IPDI,5份助溶剂乙二醇单丁醚,反应3h降温至70℃后;
加入经干燥脱水处理的5份扩链剂DMPA,反应2h后,再降温至60℃反应1.5h,降温到40℃后;
加入10份HEMA、10份BA、10份AMPS,搅拌0.5h后,加入20份去离子水高速乳化分散;
加入1份引发剂过硫酸钾,1份偶氮二异丁基脒盐酸盐溶解至上述分散乳液中,80℃自由基聚合3.5h,冷却出料,得乳白色黏稠流动液体,即为所制得的成膜剂。
实施例2
同实施例1,不同之处在于,丙烯酸单体为20份甲基丙烯酸甲酯(MMA)。
实施例3
同实施例1,不同之处在于,异佛尔酮二异氰酸酯为30份、聚己内酯为30份。
对比例1
同实施例1,不同之处在于,采用苯乙烯单体(苯乙烯)10份代替丙烯酸单体(BA)10份。
试验例1
1)成膜剂单剂外观、分散性、降滤失性检测评价
样品(实施例1所得成膜剂)于常温下目测其状态。样品加入蒸馏水中搅拌看其能否完全分散。采用压滤失仪测定样品的滤失量。采用六速粘度仪测样品的表观粘度。结果见表1。
表1
2)成膜剂单剂在不同表面上成膜性对比评价
采用扫描电镜法,分别对滤纸表面、滤纸侧面、砂石表面成膜前后进行了扫描电镜分析,具体见图1~3。可见,成膜剂无论在滤纸或是在砂石表面都观察到良好的成膜性。
3)成膜剂加入土浆后成膜性能对比
实施例1所得成膜剂按照不同质量分数加入土浆(土浆为质量分数为3%的膨润土土浆的水溶液)中,测试其性能,包括高温高压滤失量、流变性(表观粘度AV、塑性粘度PV、动切力YP、动塑比YP/PV)和API滤失量等,结果见表2~3。由表2~3可知,本发明的成膜剂性能明显优于对比例1的成膜材料,表明本发明的成膜剂的成膜能力更佳,具有更强的封堵能力。
表2不同加量下各成膜剂的高温高压滤失量对比(120℃HTHP,Vf)
加量,wt% | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
对比例1 | 90 | 81.8 | 64.6 | 54.2 | 38.4 | 35.4 | 26.2 |
实施例1 | 90 | 48.8 | 40.2 | 34.6 | 28.4 | 23 | 21.2 |
表3不同加量下各成膜剂的流变性和API滤失量对比
4)成膜剂加入钻井液体系后性能评价
1#:井浆;
2#:井浆+3wt%水;
3#:井浆+3wt%水+3wt%实施例1所得成膜剂;
将1#、2#、3#井浆高速搅拌20min后在120℃老化16h,室温测量其流变性能,结果见表4。
表4钻井液体系流变性能评价
由表4可知,某井井浆中加入成膜剂后,泥浆流变变化不大,API失水降低,说明体系的封堵性增强。
5)现场井浆中加入成膜剂渗透率恢复值室内评价
1#:吉华2-322X井浆+3%实施例1所得成膜剂;
2#:吉华2-322X井浆;
3#:吉华2-209X井浆+3%实施例1所得成膜剂;
4#:吉华2-209X井浆;
测试1#、2#、3#、4#井浆的渗透率恢复值,其中,吉华2-322X井和吉华2-209X井是吉兰泰油田吉华2断块的两口井,该区块井为页岩气井,结果见表5。
表5渗透率恢复值评价
由以上数据可知:吉华2-322X井钻井液渗透率恢复值由69.62%提高到90.5%,吉华2-209X钻井液渗透率恢复值由70.7%提高到92.2%,储层保护效果明显。
本发明实施例提出的成膜剂可在井壁或近井壁处形成一层具有良好油溶性和较高强度的膜状物,该膜状物阻止钻井液中的固相和液相侵入储层,实现广谱成膜暂堵,同时可抑制其水化,达到保护储层的目的,体系渗透率达到90%以上,保证了后期的排采问题。
以上仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (7)
1.一种钻井液用成膜剂,其特征在于,由包括如下重量份数的原料制备而得:异佛尔酮二异氰酸酯20-30份、聚己内酯20-30份、扩链剂5-10份、丙烯酸单体20-30份、2-丙烯酰胺基-2-甲基丙磺酸8-15份、助溶剂5-10份、引发剂1-5份、去离子水20-30份。
2.根据权利要求1所述的成膜剂,其特征在于,所述丙烯酸单体包括丙烯酸β-羟乙酯、丙烯酸丁酯、丙烯酸甲酯、甲基丙烯酸甲酯、丙烯酸十八碳酯中至少一种。
3.根据权利要求1所述的成膜剂,其特征在于,所述引发剂包括过硫酸钾,偶氮二异丁基脒盐酸盐,偶氮二异丁咪唑啉盐酸盐中至少一种。
4.根据权利要求1所述的成膜剂,其特征在于,所述扩链剂包括二羟甲基丙酸、1,4-丁二醇中至少一种。
5.根据权利要求1所述的成膜剂,其特征在于,所述助溶剂包括乙二醇单丁醚、异丙醇中至少一种。
6.权利要求1~5任一项所述的钻井液用成膜剂的制备方法,其特征在于,包括如下步骤:
将聚己内酯加入反应釜中,120℃真空脱水2h,降温到80℃后;
加入异佛尔酮二异氰酸酯,助溶剂,反应3h降温至70℃后;
加入扩链剂,反应2h后,降温至60℃反应1.5h,降温到40℃后;
加入丙烯酸单体、2-丙烯酰胺基-2-甲基丙磺酸,搅拌0.5h;
加入去离子水高速乳化分散后,加入引发剂,80℃自由基聚合3.5h,冷却出料,得成膜剂。
7.权利要求1~5任一项所述的钻井液用成膜剂在页岩气和煤层气钻井中的应用。
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