H口径液力举升绳索取心钻具研制及试验研究

Development and experimental study of H-caliber hydraulic lifting wireline coring tool

摘要:

绳索取心是目前广泛应用的不提钻取心技术，对于水平孔和大深度直孔取心钻探，绳索取心钻具下入是一个难度大、耗时长过程，孔深越大，效率越低。本文基于液力举升工艺原理，利用冲洗液循环动力，采用正循环取心钻进、反循环液力打捞方法，在现有取心钻具基础上对投送打捞系统进行设计，研制了H口径液力举升式绳索取心钻具。依托钻探试验平台和试验孔开展了钻具孔内试验，分别进行了3次可视化台架模拟试验、4个回次取心钻进试验、2个回次液力举升试验，钻具顺利完成取心作业并成功实现钻具内管总成的液力举升回收。液力举升绳索取心钻具的研制为水平孔及大深度直孔取心钻探工艺开拓了新思路。

Abstract:

Wireline coring is a widely used technology for core drilling without tripping the drill string. However, for horizontal and deep vertical holes, process of lowering the wireline coring tools is challenging and time-consuming, in which the efficiency decreases with the hole depth. Based on hydraulic lifting principles, utilizing the power of drilling fluid circulation, using a positive circulation for core drilling and a negative circulation for hydraulic fishing, the running-in-hole and fishing system is designed based on the existed coring drill, and the H-caliber hydraulic lifting wireline coring tool is developped. The tool are tested for 3 visualized rack, 4 core drilling runs, and 2 hydraulic lifting runs in a drilling platform and experimental boreholes. As a result, the coring operation is successfully completed and the hydraulic lifting recovery of the inner tube assembly is achieved, which offers a new perspective for coring in horizontal and deep vertical holes.