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CN108956223A - 一种弱胶结砂岩室内重塑方法 - Google Patents

一种弱胶结砂岩室内重塑方法 Download PDF

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CN108956223A
CN108956223A CN201810533972.5A CN201810533972A CN108956223A CN 108956223 A CN108956223 A CN 108956223A CN 201810533972 A CN201810533972 A CN 201810533972A CN 108956223 A CN108956223 A CN 108956223A
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赵晓东
周国庆
梁恒昌
杨金宏
吕志远
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Abstract

本发明公开了一种弱胶结砂岩室内重塑方法，在保证主要物质成分与原岩相同的前提下，实施粉碎、压制、烧结；通过高温烧结使得微米量级以下颗粒胶结强度控制性提高，毫米级颗粒存在增大重塑砂岩中孔隙率，以抵消高温烧结诱发的致密化，从而实现重塑砂岩具有与原岩类似的颗粒特征和孔隙特征；首先分别通过普通机械式和球磨机强化式破碎方法获得毫米量级和微米量级以下颗粒，然后按照一定比例将颗粒混合体、纯净水混合并压制成型，最后对成型的砂岩试样进行高温烧结，从而解决具有泥化、风化、松化、软化等物理力学特征的弱胶结砂岩现场取芯困难的技术瓶颈。

Description

一种弱胶结砂岩室内重塑方法
技术领域
本发明涉及一种弱胶结砂岩室内重塑方法，具体为一种基于粉末烧结原理的弱胶结砂岩重塑方法。
背景技术
西部煤炭产量超过全国的70%。因此，西部在未来一段时间内将是我国煤炭开发和煤矿基本建设的主战场。白垩系是西部地区井筒穿越的主要地层。白垩系弱胶结砂岩物理、力学性质的定量化研究是该类地层中井筒建设新技术提出的重要依据。但是白垩系弱胶结砂岩具有遇水泥化、遇风风化、振动松化和原始软化等物理、力学特性，使得完整岩芯取得存在困难和挑战。
沉积砂岩的室内重塑是解决上述问题的根本途径。现有重塑技术中（1）针对黏土矿物含量低的原岩，主要通过砂颗粒与黏结剂（环氧树脂等有机胶或水泥、石膏或硅铝酸盐等无机胶）混合后压制成型的方法。该类方法适用于胶结强度偏高的砂岩，不适用于弱胶结砂岩；（2）针对黏土矿物含量高的原岩，现有重塑方法主要通过对机械破碎颗粒集合体与水混合压制成型的方法。该类方法适用于极弱胶结软岩，难以适应黏土矿物含量偏低的砂岩重塑制备。
发明内容
技术问题：本发明的目的是针对西部地区井筒穿越地层岩性的主要物理、力学特性研究受制于原状岩芯不足之处，提供一种方法简单、成本低、使用效果好的基于粉末烧结原理的弱胶结砂岩室内重塑方法。
技术方案：本发明的弱胶结砂岩室内重塑方法，在保证主要物质成分与原岩相同的前提下，实施粉碎、压制、烧结；通过高温烧结使得微米量级以下颗粒胶结强度控制性提高，毫米级颗粒存在增大重塑砂岩中孔隙率，以抵消高温烧结诱发的致密化，从而实现重塑砂岩具有与原岩类似的颗粒特征和孔隙特征；具体步骤如下：
步骤一、对取自目标地层的弱胶结岩芯进行普通机械式破碎，将破碎物筛分出毫米量级的砂颗粒；
步骤二、在球磨机上对取自目标地层的弱胶结砂岩进行强化破碎至颗粒粒径达到微米量级以下；
步骤三、将毫米量级砂颗粒、微米量级以下砂颗粒和纯净水按比例混合均匀，毫米量级砂颗粒与微米量级以下砂颗粒的质量比为0~1.5之间，纯净水与砂颗粒混合物的质量比为0.05~0.2；
步骤四、利用压力机对步骤三中不同粒级砂颗粒所得的混合物进行压制成型；
步骤五、将步骤四中所得成型砂岩送入高温炉内烧结10~24h，取出自然冷确，获得弱胶结砂岩试样；
步骤六、可对获得弱胶结砂岩试样进行物理、力学特性试验。
所述压力机最大压力为目标地层砂岩上覆压力的1.0~1.5倍。
所述高温炉内的烧结温度为600~1000℃。
有益效果：由于采用了上述技术方案，本发明首先分别通过普通机械式和球磨机强化式破碎方法获得毫米量级和微米量级以下颗粒，然后按照一定比例将颗粒混合体、纯净水混合并压制成型，最后对成型的砂岩试样进行高温烧结，从而解决具有泥化、风化、松化、软化等物理力学特征的弱胶结砂岩现场取芯困难的技术瓶颈。与现有技术相比具有如下优势：
（1）弱胶结砂岩的强度主要来自于颗粒间泥质胶结和晶体胶结，本发明分别通过机械压实和高温烧结重塑两类胶结力，同时保留了原岩的主要物质成分，而主要矿物熔点以下的控制烧结不改变物质成分；
（2）利用本发明极易获得与原岩具有相同力学特性的重塑砂岩，同时还最大限度保留了与原岩相似的物理特征，从而为研究冻结凿井过程中弱胶结砂岩物性定量演化规律奠定基础。
具体实施方式：
本发明的弱胶结砂岩室内重塑方法，在保证主要物质成分与原岩相同的前提下，实施粉碎、压制、烧结。高温烧结使得微米量级以下颗粒胶结强度控制性提高，毫米级别颗粒存在增大重塑砂岩中孔隙率，以抵消高温烧结诱发的致密化，从而实现重塑砂岩具有与原岩类似的颗粒特征和孔隙特征；具体步骤如下：
第一步：对取自目标地层的弱胶结岩芯进行普通机械式破碎，并筛分出毫米量级的砂颗粒；
第二步：在球磨机上对取自目标地层的弱胶结砂岩进行强化破碎至颗粒粒径达到微米量级以下；
第三步：将毫米量级颗粒，微米量级以下颗粒，纯净水按比例混合均匀，毫米量级颗粒与微米量级以下颗粒质量比为0~1.5之间，纯净水与颗粒混合物的质量比为0.05~0.2；
第四步：在压力机上对第三步中所得混合物进行压制成型，最大压力为目标地层砂岩上覆压力的1.0~1.5倍。
第五步：将第四步中所得砂岩试样在高温炉内烧结10~24h，烧结温度600~1000℃。
第六步：按照第五步中所得砂岩试样进行物理、力学特性试验。

Claims (3)

1.一种弱胶结砂岩室内重塑方法，其特征在于：在保证主要物质成分与原岩相同的前提下，实施粉碎、压制、烧结；通过高温烧结使得微米量级以下颗粒胶结强度控制性提高，毫米级别颗粒存在增大重塑砂岩中孔隙率，以抵消高温烧结诱发的致密化，从而实现重塑砂岩具有与原岩类似的颗粒特征和孔隙特征；具体步骤如下：
步骤一、对取自目标地层的弱胶结岩芯进行普通机械式破碎，将破碎物筛分出毫米量级的砂颗粒；
步骤二、在球磨机上对取自目标地层的弱胶结砂岩进行强化破碎至颗粒粒径达到微米量级以下；
步骤三、将毫米量级砂颗粒、微米量级以下砂颗粒和纯净水按比例混合均匀，毫米量级砂颗粒与微米量级以下砂颗粒的质量比为0~1.5之间，纯净水与砂颗粒混合物的质量比为0.05~0.2；
步骤四、利用压力机对步骤三中不同粒级砂颗粒所得的混合物进行压制成型；
步骤五、将步骤四中所得成型砂岩送入高温炉内烧结10~24h，取出自然冷确，获得弱胶结砂岩试样；
步骤六、可对获得弱胶结砂岩试样进行物理、力学特性试验。
2.根据权利要求1所述的一种弱胶结砂岩室内重塑方法，其特征在于：所述压力机最大压力为目标地层砂岩上覆压力的1.0~1.5倍。
3.根据权利要求1所述的一种弱胶结砂岩室内重塑方法，其特征在于：所述高温炉内的烧结温度为600~1000℃。
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CN112304722A (zh) * 2020-10-20 2021-02-02 中国矿业大学 一种含泥质弱胶结砂岩重塑方法
CN114047040A (zh) * 2021-10-22 2022-02-15 北京中煤矿山工程有限公司 一种钻井法凿井滚刀破碎弱胶结岩石试验重塑大体积岩样的制备方法

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KR101662167B1 (ko) * 2016-05-16 2016-10-04 (주)우진이앤씨 개량 지반 시료 채취기 및 이를 이용한 개량 지반의 시공 품질 확인 방법
CN106556687A (zh) * 2016-11-21 2017-04-05 中国石油大学(华东) 弱胶结未成岩水合物声学和饱和度同步测试装置及方法
CN106338422A (zh) * 2016-11-22 2017-01-18 河南理工大学 岩石弱胶结岩石试件加工工艺

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CN112304722A (zh) * 2020-10-20 2021-02-02 中国矿业大学 一种含泥质弱胶结砂岩重塑方法
CN112304722B (zh) * 2020-10-20 2021-09-21 中国矿业大学 一种含泥质弱胶结砂岩重塑方法
CN114047040A (zh) * 2021-10-22 2022-02-15 北京中煤矿山工程有限公司 一种钻井法凿井滚刀破碎弱胶结岩石试验重塑大体积岩样的制备方法
CN114047040B (zh) * 2021-10-22 2024-03-26 北京中煤矿山工程有限公司 一种钻井法凿井滚刀破碎弱胶结岩石试验重塑大体积岩样的制备方法

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