一种用于煤矿采空区钻井的固化堵漏液

李称心

doi:10.3969/j.issn.1001-5620.2021.01.013

一种用于煤矿采空区钻井的固化堵漏液

doi: 10.3969/j.issn.1001-5620.2021.01.013

李称心^1,2

1. 瓦斯灾害监控与应急技术国家重点实验室, 重庆 400037;
2. 中煤科工集团重庆研究院有限公司, 重庆 400039

基金项目:

国家“十三五”重大专项“采动稳定区破碎带地面一体化钻井工艺与装备”（2016ZX05045001-007）；山西省揭榜招标项目“煤炭采空区煤层气抽采关键技术”（20201101001）

详细信息

作者简介:
李称心,工程师,1982年生,主要从事煤层气钻井,钻探工艺与装备,钻井流体研究。E-mail:43667754@qq.com

中图分类号: TE254
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出版历程
- 收稿日期: 2020-11-01
- 网络出版日期: 2021-08-16

A Solidifying Mud Loss Control Slurry for Well Drilling in Coal Mine Goafs

LI Chenxin^1,2

1. StateKey Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037;
2. Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400039

摘要

摘要: 针对煤矿采空区钻井时出现的钻井液严重漏失问题，研究了一种新型固化堵漏液，以满足钻井过程中的堵漏要求，保障钻井安全。该工作液以矿渣为固化剂，辅以激活剂、悬浮剂等外加剂形成配方，性能可以满足煤矿采空区钻井低密度低温的封堵、固化要求。同时，通过室内性能评价及微观结构测试，验证了固化堵漏液的水化机理，固化剂在激活剂作用下，玻璃体结构被破坏，生成水化产物填充于空间中，部分富钙相脱离原结构，充填在水化产物的空隙中。随着富硅相的继续水化，其水化产物填充于富钙相水化产物间隙，使得水化产物结构愈来愈致密，水化产物主要是C—S—H、C—A—S—H凝胶，使得固化体形成了较高的抗压强度。并且根据模拟试验与现场试验，证实了固化堵漏液能够满足采空区堵漏要求，达到了研究目的。
- 煤层气 /
- 固化 /
- 采空区钻井 /
- 堵漏
Abstract: A new solidifying mud loss control slurry has been developed for use in well drilling in coal mine goafs where severe mud losses were frequently encountered. The mud loss control slurry is formulated with slag as the solidifying agent, and other additives such as activator and suspending agent etc. This mud loss control slurry has the ability to satisfy the needs of plugging and solidifying when drilling in coal mine goafs characteristic of low density and low temperature. The hydrational mechanism of the mud loss control slurry was verified through laboratory evaluation and micro-structure examination. Under the action of the activator, the vitreous structure of the solidifying agent is broken down, producing various hydrational products. Part of the calcium-rich phase leaves the original structure and fills in the pores of the hydrational products. On the other hand, as the silica-rich phase continues to become hydrated, the hydrational products are filling in the pores of the hydrational product of the calcium-rich phase, thereby making the hydrational products denser and denser. The hydrational products are mainly C—S—H and C—A—S—H gels, rendering the solidified product high compressive strength. Data from simulation tests and field tests have proved that the solidifying mud loss control fluid is able to satisfy the needs of mud loss control in coal mine goafs, and the goal of studying on the mud loss control in coal mine goafs is achieved.
- Coal bed methane /
- Solidifying /
- Drilling in coal mine goaf /
- Mud loss control

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参考文献(15)

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