Large-diameter long-drilling-distance coring drilling tool and coring drilling method

Abstract

The invention provides a large-diameter long-drilling-distance coring drilling tool and a coring drilling method. The drilling tool is composed of a single-action mechanism, an outer pipe assembly and an inner pipe assembly. The outer pipe assembly is provided with a set of outer pipe components sequentially connected in series from top to bottom. Each outer pipe component comprises an outer pipe and a reamer, and the outer pipe is in threaded connection with the reamer. The outer pipe of the outer pipe component located at the upmost end is assembled with the single-action mechanism. The reamer of the outer pipe component located at the lowermost end is assembled to a drill bit. The inner pipe assembly is provided with a set of inner pipe components which are sequentially connected in series from top to bottom. Each inner pipe component comprises a standard inner pipe and an inner pipe coupling. The standard inner pipe of the inner pipe component located at the uppermost end is assembled with the single-action mechanism. The invention further provides the drilling method. By the adoption of the large-diameter long-drilling-distance coring drilling tool and the coring drilling method, the problems that according to a small-diameter coring and large-diameter reaming finishing drilling mode, the number of parts and components of drilling equipment is large, operation steps are troublesome, the construction period is long, the engineering cost is high, and the hole accident risk is high are solved, and the purpose of improving the economical efficiency and safety of scientific drilling is achieved.

Description

technical field [0001] The invention relates to a core drilling tool and a core drilling method, in particular to a large-caliber long-drilling distance core drilling tool and a core drilling method suitable for scientific drilling, and belongs to the technical field of drilling. Background technique [0002] Scientific drilling is a scientific project whose main purpose is to obtain formation cores and geophysical prospecting data in wells. It requires obtaining representative, continuous, and high recovery rate in-situ and undisturbed cores. Since conventional core drilling tools are suitable for The following drill holes were obtained with a core diameter of Below, the core holding capacity is not more than 10m, so in the large-diameter well section, scientific drilling has to adopt "small-diameter coring (generally ), large-diameter reaming" drilling mode. [0003] The above-mentioned "small-diameter coring, large-diameter reaming" drilling completion mode must be ...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a large-diameter long-distance coring tool and a coring drilling method, aiming to solve the problem of large number of drilling equipment parts, cumbersome operation steps, Problems such as long construction period, high engineering cost and high risk of in-hole accidents, to achieve the purpose of improving the economics and safety of scientific drilling

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