天津地区地热钻井中地层漏失分析及堵漏方法选择

摘要

天津地区地热钻井中，井漏是常见的现象。按照地层差异，井漏可以分为孔隙型漏失和裂隙、溶洞型漏失两种，孔隙型漏失主要发生在砂岩、砂砾岩中，漏失量小，处理起来比较简单，裂隙、溶洞型漏失漏失量大，堵漏工艺复杂，且不易奏效。本文通过两种地热井漏失的成因分析，分别列举了它们各自的堵漏方法和施工中的注意事项，重点对堵漏难度大的裂隙、溶洞型漏失进行了漏层判定分析和堵漏方法介绍，并通过两项施工实例来加以佐证。此研究对地热钻井中的地层漏失及堵漏工艺有一定的借鉴作用。%Geothermal drilling in Tianjin, well leakage is a common phenomenon. According to the formation difference, well leakage can be divided into pore type leakage and fissured-cavern leakage. Pore type leakage mainly occurred in sandstone and gravel, the leakage is small, it is relatively simple to deal with. Fissured-cavern leakage often with large leakage loss, and is not easy to work. This article analyzes the causes of two kinds of leakage, Separately sets their respective plugging methods and the cautions for construction. The emphasis is on the analysis of fissured-cavern leakage, and through two examples to prove the construction. In this paper, the formation leakage and plugging technology in geothermal drilling has a certain reference.