WO2021068976A1 - 一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液 - Google Patents

一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液 Download PDF

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WO2021068976A1
WO2021068976A1 PCT/CN2020/122387 CN2020122387W WO2021068976A1 WO 2021068976 A1 WO2021068976 A1 WO 2021068976A1 CN 2020122387 W CN2020122387 W CN 2020122387W WO 2021068976 A1 WO2021068976 A1 WO 2021068976A1
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elastic
agent
pressure
spacer fluid
fluid
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PCT/CN2020/122387
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English (en)
French (fr)
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韦江雄
朱江林
罗宇维
罗东辉
李占东
曹欢
黄浩良
何昱昌
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华南理工大学
广州五山材料科技有限公司
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Priority to US17/289,746 priority Critical patent/US20220259481A1/en
Publication of WO2021068976A1 publication Critical patent/WO2021068976A1/zh

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    • 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
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/424—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells using "spacer" compositions
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like

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  • the invention relates to the field of oilfield drilling and cementing, in particular to an elastic agent and a preparation method thereof, and an elastic isolating fluid for preventing casing expansion and damage for cementing.
  • the cement slurry When the offshore semi-submersible platform is in 13-3/8" casing and 9-5/8" casing cementing operations, the cement slurry generally does not return to the mud line, and the top of the cement slurry will be several hundred meters or even several Kilometres of fluid are sealed between 13-3/8” casing and 20” casing, or between 13-3/8” casing and 9-5/8” casing.
  • One section of fluid is the isolation fluid, which mainly functions to isolate the drilling fluid from the cement slurry and prevent the drilling fluid from contaminating the cement slurry used for cementing.
  • the temperature at the bottom of the well differs greatly from the temperature at the well head.
  • the bottom hole temperature will be 120°C-130°C
  • the surface casing mud line temperature will be close to 0°C.
  • the isolation fluid system enclosed in the two-layer casing is likely to expand rapidly when heated, causing expansion and damage to the casing to exceed the casing’s own squeezing force, which will affect the cementing quality and production cycle of the entire well.
  • the same cementing problems are also faced.
  • Domestic conventional isolation fluids are mainly composed of isolation agents added with fluid loss agent and water.
  • the main disadvantages are: relevant data and experimental results show ("Petroleum Drilling Technology Journal", the influence of temperature and pressure on the density of fluids in wells), In a closed environment, the expansion pressure of the conventional isolation fluid will increase to 3-8MPa for every 10°C increase, while the collapse strength of the 13-3/8” casing is only about 20MPa.
  • the purpose of the present invention is to provide an elastic agent and a preparation method thereof, and an elastic isolating fluid for preventing casing expansion and damage for cementing.
  • the present invention provides a method for preparing an elastic agent, which includes the following steps:
  • the heating temperature in step (1) is 60 ⁇ 90°C; the inorganic porous material is micron-sized; the inorganic porous material includes more than one of porous ceramsite, diatomaceous earth, zeolite or porous glass; The mass ratio of ester and inorganic porous material is 1: (1 ⁇ 8).
  • the mass ratio of the mixture and the rubber powder in step (2) is (1 ⁇ 3):1; the temperature during mixing is room temperature ⁇ 53°C.
  • the rubber powder in step (2) is high elastic modulus rubber powder, and the elastic modulus is 0.01-1 Gpa.
  • the mixing in step (1) and step (2) refers to stirring and mixing
  • the stirring rate in step (1) is 100 to 150 revolutions per minute; the stirring time is greater than 3 hours; and the stirring in step (2) The speed is 30 to 120 revolutions per minute; the stirring time is more than 1 hour.
  • step (1) the polycaprolactone and the inorganic porous material are thoroughly mixed and then placed in water, stirred for 5-10 minutes under the condition of 30-50 RPM, and allowed to stand for more than 30 minutes to take the floating matter to obtain the mixture.
  • the invention also provides an elastic agent prepared by the preparation method.
  • the present invention also provides an elastic isolating fluid for preventing casing expansion and damage for cementing, comprising the following components: water, defoaming agent, isolating agent and elastic agent, and the mass ratio of water, defoaming agent, isolating agent and elastic agent 100: (0.5 ⁇ 1): (0.5 ⁇ 3): (30-60); wherein the elastic agent is the above-mentioned elastic agent.
  • the defoamer is PC-X60L agent.
  • the release agent is PC-S23S.
  • the present invention has the following beneficial effects and advantages:
  • the elastic agent provided by the present invention can compress and deform the release space under a certain pressure environment, and at the same time rebound in time to recover the deformation when the pressure is weakened, and effectively adjust the pressure of the trap liquid; the elastic agent can not be broken during the construction process , No chemical reaction occurs in advance, and finally achieve an effective reduction of the thermal expansion internal pressure of the fluid;
  • the present invention also provides an elastic isolating liquid comprising the elastic agent, which has good rheological properties and water loss properties; good compatibility with cement slurry and mud, and the elastic agent is an inert material. Affect other properties of the spacer fluid; the elastic spacer fluid system has good ductility and can better release the pressure generated by its own thermal expansion.
  • This embodiment provides a method for preparing an elastic agent, which includes the following steps:
  • This embodiment also provides a cementing anti-casing expansion and damage elastic isolating fluid, which includes the following components by weight:
  • This embodiment also provides a blank basic isolating liquid, including the following components by weight: 400 g of water, 2 g of antifoaming agent PC-X60L, and isolating agent PC-S32S 10 g.
  • test methods for testing the heating pressure value of clean water, blank base isolation fluid and elastic isolation fluid are as follows:
  • isolation fluid in the pressurized thickening instrument environment, simulate the bottom hole 20 minutes rise BHCT of 55 °C, 40MPa environment for 30 minutes, then reduce the isolation fluid temperature to room temperature 26 °C, and then set the heating temperature program in UCA Heat up to 90°C, and read the temperature and pressure values every 5°C.
  • the change value of the water pressure with temperature is the largest, reaching 11292.42psi (77.88MPa) at 90°C; and the pressure of the blank basic spacer fluid changes with temperature more obviously. It reaches 10845.24 psi (74.79 MPa) at 90°C; the pressure of the elastic isolating fluid has a significant decreasing trend with temperature changes.
  • the pressure is 4907.00 psi (33.84MPa), and the temperature is between 70°C and 80°C.
  • its pressure was maintained at 5412.00psi (37.32MPa), and at 90°C, its pressure was only 5531.00 (38.14MPa).
  • its pressure dropped by 5761.42psi (39.73MPa) indicating that the elastic isolation fluid has Very good effect of releasing stress.
  • the density and funnel viscosity of the obtained elastic isolating liquid were tested, and the results showed that the funnel viscosity of the elastic isolating liquid was 100S, there was no obvious sedimentation in 12 hours, and there was false sedimentation in 24 hours.
  • the blank cement slurry includes the following components by weight: 40.6g water, 0.5g PC-X62L, 1g PC-F41L, 3g PC-G86L , 4g PC-GS12L, 0.25g PC-H21L, 1.5g PC-B10 and 100g JH/G.
  • the thickening time of the blank cement slurry and the cement slurry contaminated by the elastic isolation fluid are 195 minutes and 228 minutes, respectively.
  • elastic isolation fluid is indispensable for contact and pollution with these two fluids during the displacement pumping process. Will it affect the rheological properties, thickening time, and thickening time of the cement slurry? Performance such as compressive strength is very important; the pollution of mud is reflected in whether the rheological properties meet the requirements.
  • the rheological compatibility test of the cement slurry contaminated by the elastic isolating liquid with different content of elastic isolating liquid is carried out.
  • the test instrument is a six-speed rotary viscometer. Before the test, the cement slurry contaminated by the elastic isolating liquid is cured at a temperature of 46°C. For 20 minutes, the test results are shown in Table 4.
  • the compressive strength of the cement slurry decreases.
  • the enterprise standard requires that the compressive strength drop by less than 70%.
  • the influence of the elastic spacer liquid on the compressive strength of the cement slurry is tested.
  • the test results show that the compressive strength of the blank cement slurry (24h, 71°C) is 29.7Mpa, and the compressive strength of the cement slurry contaminated by the elastic spacer (the volume fraction of the elastic spacer is 25%) (24h, 71°C) ) Is 15.3Mpa, the compressive strength is reduced by 48%, which meets the requirements of enterprise standards.
  • the elastic isolation liquid provided by the present invention has a good pressure releasing effect.
  • the elastic isolation fluid system has good rheological compatibility with the on-site water-based mud and good settlement stability.
  • the elastic isolating fluid system has good rheological compatibility with cement slurry, has almost no effect on thickening, and has a slight decrease in compressive strength, which meets the requirements of enterprise standards.

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液，所述弹性剂的制备方法包括以下步骤：(1)取聚己内酯和无机多孔材料在加热条件下充分混合，得混合物；(2)将混合物和高弹模橡胶粉混合，得弹性剂。包含所述弹性剂的弹性隔离液在50℃、50MPa深水井底泵送压力下不发生破碎，所述弹性剂的弹性隔离液流变性能及失水性能良好；与水泥浆、泥浆的配伍性良好，弹性体为惰性材料，不影响隔离液其他性能。弹性隔离液的压力随温度的变化数值下降的趋势非常明显，在90℃的时候其压力仅为38.14MPa，相比于清水，其压力下降了39.73MPa，说明弹性隔离液具有很好的释放压力的效果。

Description

一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液 技术领域
本发明涉及油田钻井固井领域，特别是涉及一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液。
 背景技术
海上半潜式平台在13-3/8”套管和9-5/8”套管固井作业时，水泥浆一般不返至泥线，水泥浆首浆的顶部会有几百米甚至几千米的流体被封隔在13-3/8”套管和20”套管之间，或者被封隔在13-3/8”套管和9-5/8”套管之间，这一段流体即为隔离液，主要起到隔离钻井液与水泥浆的作用，防止钻井液污染到固井使用的水泥浆。
对于超高温生产井或者海洋深水钻井而言，井底的温度和井口的温度相差悬殊。如一口2000米水深的深水井，若钻井垂深为3000米，地梯温度为4℃/100米，则井底温度120℃-130℃，表层套管泥线处温度接近0℃，这段两层套管内封闭的隔离液体系很有可能在受热情况系急剧膨胀，而造成对套管涨损超过套管自身的耐挤压力后，影响整口井的固井质量和生产周期。同样，在高温超高温井中也面临同样的固井难题。
国内常规的隔离液主要使用隔离剂添加降失水剂和水组合而成，主要缺点在于：相关资料和实验结果表明（《石油钻探技术期刊》，温度和压力对井内流体密度的影响），在密闭环境时，每升高10℃，常规隔离液的膨胀压力会提高至3-8MPa，而13-3/8”套管挤毁强度仅在20MPa左右。
 技术解决方案
为了解决现有技术中存在的问题和不足，本发明的目的在于提供了一种弹性剂及其制备方法与固井用防套管涨损弹性隔离液。
本发明的目的至少是通过以下技术方案之一实现的。
本发明提供了一种弹性剂的制备方法，包括以下步骤：
（1）取聚己内酯和无机多孔材料在加热条件下充分混合，得混合物；
（2）将混合物和橡胶粉混合，得弹性剂。
优选地，步骤（1）中加热的温度为60~90℃；无机多孔材料为微米级的；无机多孔材料包括多孔陶粒、硅藻土、沸石或多孔玻璃中的一种以上；聚己内酯和无机多孔材料的质量比为1：（1~8）。
优选地，步骤（2）中混合物和橡胶粉的质量比为（1~3）:1；混合时的温度为室温~53℃。
优选地，步骤（2）中所述橡胶粉为高弹模橡胶粉，弹性模量为0.01~1Gpa。
优选地，步骤（1）和步骤（2）中所述的混合是指搅拌混合，步骤（1）搅拌的速率为100~150转/分钟；搅拌的时间大于3小时；步骤（2）搅拌的速率为30~120转/分钟；搅拌的时间大于1小时。
优选地，步骤（1）中聚己内酯和无机多孔材料充分混合后置于水中，在30~50RPM的条件下搅拌5~10分钟，静置30分钟以上取漂浮物，得混合物。
本发明还提供了一种由所述制备方法制备的弹性剂。
本发明还提供了一种固井用防套管涨损弹性隔离液，包括如下组分：水、消泡剂、隔离剂和弹性剂，水、消泡剂、隔离剂和弹性剂的质量比为100：（0.5~1）：（0.5~3）：（30-60）；其中弹性剂为上述的弹性剂。
优选地，所述消泡剂为PC-X60L剂。
优选地，隔离剂为PC-S23S。
 有益效果
和现有技术相比，本发明具有以下有益效果和优点：
（1）本发明提供的弹性剂在一定的压力环境下可以压缩变形释放空间，同时在压力减弱时及时反弹恢复形变，有效调节圈闭液体的压力；所述弹性剂能够在施工过程中不破碎、不提前发生化学反应，最终达到有效降低流体的热膨胀内压；
（2）本发明还提供了一种包括所述弹性剂的弹性隔离液，所述隔离液流变性能及失水性能良好；与水泥浆、泥浆的配伍性良好，弹性剂为惰性材料，不影响隔离液其他性能；弹性隔离液体系的延展性能良好，能较好的释放自身受热膨胀所产生的压力。
 本发明的实施方式
以下结合具体实施例对本发明的具体实施作进一步说明，但本发明的实施不限于此。
实施例
本实施例提供了一种弹性剂的制备方法，包括以下步骤：
（1）取1000g聚己内酯和2000g微米级多孔陶瓷在70℃的温度下搅拌混合3.5h，搅拌速率为120转/分钟，得混合物；
（2）将2000g混合物和1000g丁腈橡胶粉在30℃的温度下搅拌混合1.5h，搅拌速率为60转/分钟，得弹性剂。
本实施例还提供了一种固井防套管涨损弹性隔离液，包括如下重量份的组分：
400g的水、2g的消泡剂PC-X60L剂、10g的隔离剂PC-S32S和180g的所述弹性剂。
本实施例还提供了一种空白基础隔离液，包括如下重量份的组分：水400g、消泡剂PC-X60L剂 2 g、隔离剂PC-S32S 10 g。
测试清水、空白基础隔离液和弹性隔离液的升温压力值的试验方法为：
（1） 测试清水的升温压力数值
将高温高压釜体内装满清水，温度为室温26℃，为清水加一个初始压力2856.5psi（19.7MPa）开始，然后在UCA设定加热温度程序进行加热，观察压力数值增长趋势，直至升值90℃，读取温压数值，记录每个温度段压力的增加值。
（2）测试空白基础隔离液、弹性隔离液的升温压力数值
先将隔离液放置增压稠化仪环境下，模拟井底20分钟升值BHCT为 55℃、40MPa环境左右保持30分钟，再将隔离液温度降至室温26℃，然后在UCA设定加热温度程序进行加热,加热至90℃,每升高5℃读取温压数值。
对比清水、空白基础隔离液升温过程的压力数值，通过观察同一温度段的压力大小来判断弹性隔离液是否能够缓解压力增长。如弹性隔离液在同一温度段压力明显小于清水，说明该隔离液具有良好的缓解压力增长能力。
测试得到的水、空白基础隔离液和弹性隔离液的升温压力值，如表1、表2和表3所示。
表1清水压力随温度升高数值
温度（℃） 压力（psi）
26 2856.50（19.7MPa）
30 3161.00（21.80MPa）
35 3628.32（25.02MPa）
40 4200.63（28.97MPa）
45 4697.07（32.39MPa）
50 5397.07（37.22MPa）
55 6037.25（41.64MPa）
60 6722.09（46.36MPa）
65 7461.59（51.46MPa）
70 8292.17（57.18MPa）
75 8952.44（61.74MPa）
80 9823.07（67.75MPa）
85 10721.88（73.94MPa）
90 11292.42（77.88MPa）
将高温高压釜体内装满水，循环将温度室温26℃，压力按照1500米左右隔离液初始压力20MPa附近开始，然后设定加热温度程序进行加热，观察压力曲线增长趋势，直至升值90℃并等待温度段的平稳时，读取温压曲线，记录每个温度段压力的增加值。
 
表2空白基础隔离液压力随温度升高数值
温度（℃） 压力（psi）
26 2856.50（19.7MPa）
30 3101.00（21.38MPa）
35 3508.42（24.19MPa）
40 4006.63（27.63MPa）
45 4477.07（30.87MPa）
50 5087.02（35.08MPa）
55 5846.02（40.31MPa）
60 6492.09（44.77MPa）
65 7161.32（49.39MPa）
70 7984.17（55.06MPa）
75 8452.32（58.29MPa）
80 9226.45（63.63MPa）
85 10432.27（71.94MPa）
90 10845.24（74.79MPa）
 
表3弹性隔离液压力随温度升高数值
温度（℃） 压力（psi）
26 2856.50（19.7MPa）
30 2900.00（20.00MPa）
35 3045.00（21.00MPa）
40 3235.00（22.43MPa）
45 3602.00（24.84MPa）
50 4108.00（28.33MPa）
55 4565.50（31.48MPa）
60 4907.00（33.84MPa）
65 5081.00（35.04MPa）
70 5422.50（37.39MPa）
75 5412.00（37.32MPa）
80 5412.00（37.32MPa）
85 5531.00（38.14MPa）
90 5531.00（38.14MPa）
先将弹性隔离液放置增压稠化仪环境下，模拟井底20分钟，升到井底循环温度（BHCT） 55℃、40MPa环境左右保持30分钟，再将弹性隔离液温度降至26℃，然后重新开始加热程序至78℃（井底静止温度BHST），最高加热至90℃。每升高5℃读取温压曲线。升温速率：2.5℃/min。对比水、空白基础隔离液升温过程的压力曲线，通过观察同一温度段的压力大小来判断该弹性隔离液是否能够缓解压力增长。弹性隔离液在同一温度段压力明显小于水和空白基础隔离液压力值，说明该弹性隔离液具有良好的缓解压力增长能力。
通过以上三组表格数据的比较，水的压力随温度的变化数值是最大的，在90℃时达到了11292.42psi（77.88MPa）；而空白基础隔离液的压力随温度的变化数值也比较明显，在90℃时达到了10845.24psi（74.79MPa）；弹性隔离液的压力随温度的变化数值下降的趋势非常明显，在60℃，其压力为4907.00psi（33.84MPa），在70℃到80℃的时候，其压力维持在5412.00psi（37.32MPa），而在90℃的时候其压力仅为5531.00（38.14MPa），相比于水，其压力下降了5761.42psi（39.73MPa），说明弹性隔离液具有很好的释放压力的效果。
对所得弹性隔离液进行密度和漏斗粘度测试，结果表明该弹性隔离液的漏斗粘度为100S，12小时无明显沉降现象，24小时有虚沉降。
配制水泥浆并测试所得弹性隔离液与水泥浆的稠化相容性，空白水泥浆包括如下的重量份的组分：40.6g水、0.5g PC-X62L、1g PC-F41L、3g PC-G86L、4g PC-GS12L、0.25g PC-H21L、1.5g PC-B10和100g JH/G。向配制的空白水泥浆中加入上述隔离液，使隔离液污染水泥浆的体积份数为25%，得受弹性隔离液污染的水泥浆。空白水泥浆和受弹性隔离液污染的水泥浆稠化时间分别为195分钟和228分钟，实验结果表明：模拟井底温压条件，即使井底水泥浆受到弹性隔离液的25%体积份数的污染，水泥浆的稠化时间延长34分钟，未造成稠化缩短或稠化超期延长的现象。
弹性隔离液作为隔离水泥浆和泥浆的中间流体，必不可少的在顶替泵送的过程中会和这两种流体产生接触和污染，污染后是否影响水泥浆的流变性能、稠化时间、抗压强度等性能至关重要；对泥浆的污染体现在流变性能是否满足要求。
对含有不同含量弹性隔离液的受弹性隔离液污染的水泥浆进行流变相容性测试，测试的仪器是六速旋转粘度计，测试之前对受弹性隔离液污染的水泥浆在46℃温度养护20分钟，测试结果如表4所示。
表4 隔离液与空白水泥浆的相容性实验结果
Figure dest_path_image002aa
取中海油湛江分公司陵水17-2气田的现场水基泥浆，与不同量的所述弹性隔离液进行混合，弹性隔离液与现场水基泥浆的相容性结果如表5所示。
表5 弹性隔离液与现场水基泥浆的相容性结果
Figure dest_path_image004aa
 表4、表5的实验结果表明，隔离液与空白水泥浆、现场水基泥浆接触污染以后，流变性能影响都不大，对水泥浆的顶替及流变性能符合施工要求。
向水泥浆中加入隔离液，通常情况下，水泥浆的抗压强度下降，企业标准要求抗压强度下降小于70%，本实施例将弹性隔离液对水泥浆的抗压强度的影响进行测试，测试结果表明，空白水泥浆的抗压强度为(24h,71℃)为29.7Mpa，受弹性隔离液污染的水泥浆（弹性隔离液的体积分数为25%）的抗压强度(24h,71℃)为15.3Mpa，抗压强度下降48%，符合企业标准要求。
由此可知，本发明提供的弹性隔离液具有很好的释放压力的效果。弹性隔离液体系与现场水基泥浆流变配伍性良好、沉降稳定性良好。弹性隔离液体系和水泥浆流变配伍性良好、稠化几乎无影响、抗压强度略有下降，符合企业标准要求。
以上所述，仅为本发明的较佳实施例而已，并非对本发明做任何形式上的限定。凡本领域的技术人员利用本发明的技术方案对上述实施例作出的任何等同的变动、修饰或演变等，均仍属于本发明技术方案的范围内。

Claims (10)

  1. 一种弹性剂的制备方法，其特征在于，包括以下步骤：
    （1）取聚己内酯和无机多孔材料在加热条件下充分混合，得混合物；
    （2）将混合物和橡胶粉混合，得弹性剂。
  2. 根据权利要求1所述的弹性剂的制备方法，其特征在于，步骤（1）中加热的温度为60~90℃；无机多孔材料为微米级的；无机多孔材料包括多孔陶粒、硅藻土、沸石或多孔玻璃中的一种以上；聚己内酯和无机多孔材料的质量比为1：（1~8）。
  3. 根据权利要求1所述的弹性剂的制备方法，其特征在于，步骤（2）中混合物和橡胶粉的质量比为（1~3）:1；混合时的温度为室温~53℃。
  4. 根据权利要求1所述的弹性剂的制备方法，其特征在于，步骤（2）中所述橡胶粉为高弹模橡胶粉，弹性模量为0.01~1Gpa。
  5. 根据权利要求1所述的弹性剂的制备方法，其特征在于，步骤（1）和步骤（2）中所述的混合是指搅拌混合，步骤（1）搅拌的速率为100~150转/分钟；搅拌的时间大于3小时；步骤（2）搅拌的速率为30~120转/分钟；搅拌的时间大于1小时。
  6. 根据权利要求1所述的弹性剂的制备方法，其特征在于，步骤（1）中聚己内酯和无机多孔材料充分混合后置于水中，在30~50RPM的条件下搅拌5~10分钟，静置30分钟以上取漂浮物，得混合物。
  7. 一种由权利要求1至6任一项所述制备方法制备的弹性剂。
  8. 一种固井用防套管涨损弹性隔离液，其特征在于，包括如下组分：水、消泡剂、隔离剂和弹性剂，水、消泡剂、隔离剂和弹性剂的质量比为100：（0.5~1）：（0.5~3）：（30-60）；其中弹性剂为权利要求6所述的弹性剂。
  9. 根据权利要求8所述的固井用防套管涨损弹性隔离液，其特征在于，所述消泡剂为PC-X60L剂。
  10. 根据权利要求8所述的固井用防套管涨损弹性隔离液，其特征在于，隔离剂为PC-S23S。
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