复杂破碎地层孔底驱动快速跟管钻进技术研究

Research on the technology of fast drilling with casing driven at the bot⁃tom borehole in complicated broken stratum

跟管钻进技术因其可以保护孔壁,防止卡钻,防止漏失,提高套管作业效率等特点,被广泛应用于油气钻井领域,但由于煤矿井下地层条件的复杂性,以及井下空间和现有钻机设备限制,该技术在解决煤矿井下钻探复杂破碎地层下套管作业困难、作业效率低下等问题方面未有规模应用。针对这些问题,本文以河南赵固二矿为例,在分析复杂破碎地层下套管困难原因的基础上,提出孔底驱动跟管钻进技术,开发出了孔底传扭机构,并在赵固二矿进行了工业性试验,研究结果表明,孔底驱动跟管钻进技术解决了常规下套管工艺套管不转动、不排渣、易被卡死的问题,解决了复杂破碎地层套管作业效率低下和易形成废孔的问题,在穿越复杂破碎地层中应用具有较大优势。

The technology of drilling with casing is widely used in the field of oil and gas drilling as the feature of hole wall protection,sticking and leakage prevention,and efficiency enhancement of casing operation.However because of the complex condition of formations in coal mines and the limitations of underground space and existing drilling equipment,this technology is not applicated on large‑scale to solve the prolem in coal mine i.e.casing operation difficulty,low operating efficiency and so on.Focusing on these problems,taking the Zhaogu Second Mine as an example,based on the analysis of the reason for casing difficulties in complex broken strata,this paper proposed the technology of drilling with casing driven at the bottom borehole,developed the bottom transmitting torque mechanism and made industrial tests in Zhaogu Second Mine.The results showed that the problem of casing non‑rotation,no slag discharge and being stuck under conventional casing process were solved by this technology,moreover,the problem of low casing efficiency and easy to form waste boreholes were also solved.This technology has greater advantages in the application of drilling across complex broken strata.