Engineering exploration wire line coring drilling tool suitable for seafloor drilling machines

Abstract

The invention discloses an engineering exploration wire line coring drilling tool suitable for seafloor drilling machines. The engineering exploration wire line coring drilling tool includes an outertube assembly and an inner tube assembly; the outer tube assembly includes an elastic clamp blocking head, an elastic clamp chamber, an outer tube, a hole expanding machine and a drilling bit which are connected in sequence; the inner assembly includes a salvaging spearhead, an elastic clamp locating mechanism, an elastic clamp support, a single moving mechanism, an inner tube joint, a backwater ball valve, an inner tube and a core screened pipe; the salvaging spearhead is connected with the elastic clamp locating mechanism, and the elastic clamp locating mechanism is connected with the elastic clamp support; a dangling loop is arranged on the side wall of the elastic clamp support and is placed on a stay ring on the inner wall of the outer tube; the elastic clamp support is connected withthe single moving mechanism, and the single moving mechanism is connected with the inner tube joint; the lower end of the inner tube joint is connected with the upper end of the inner tube, and the core screened pipe is arranged in the inner tube; and the single moving mechanism includes a mandrel, a casing pipe end cover, an upper force transmission clamp sleeve and a lower force transmission clamp sleeve. According to the engineering exploration wire line coring drilling tool suitable for the seafloor drilling machines, the single moving performance is stable, the centering effect of a bearing is good, the disturbance degree for a soil sample is low, and the condition of sticking is prevented when the inner tube assembly is salved.

Description

technical field [0001] The invention relates to a cable core drilling tool, in particular to a cable core drilling tool suitable for seabed drilling rigs for seabed engineering survey. Background technique [0002] The development and utilization of seabed oil and gas resources has become a new hotspot in the future resource strategies of countries all over the world. In the preliminary survey process of marine infrastructure construction such as subsea oil and gas well sites and drilling platforms, drilling is the most direct way to obtain engineering geological samples. The currently used wireline core drilling tools are mainly used for land core drilling rigs and offshore drilling rigs located on the deck of offshore drilling ships. The structure usually adopts the advanced form of the inner tube, and the inner tube assembly is realized by two sets of one-way thrust ball bearings. The single action, and cooperate with the circlip with spring leaf to realize the clampin...

AI Technical Summary

Problems solved by technology

The subsea drilling rig takes all the required inner pipe assemblies into the water through the drill pipe magazine located on the drilling rig body and then carries out the seabed coring operation. After all the coring operations are completed, all the inner pipe assemblies Together with the drilling rig, it is lifted to the deck of the supporting mother ship, and it works for a long time under water

The existing conventional drilling tools mainly have the following problems: the inner pipe assembly of the drilling tool has poor single-action performance and no centering function, the existing structure does not consider the seawater corrosion effect, the protection performance of the upper bearing is poor, and the Sustained pressure is likely to cause bearing failure, the suspension positioning components of the inner pipe and outer pipe of the drilling tool are easy to get stuck, resulting in difficulty in salvage, the jamming mechanism greatly disturbs the sample, and the plastic core liner cannot be centered. During the core, the soil sample is squeezed into the annular gap between the liner and the inner pipe, which will cause plastic deformation of the liner and lead to practical problems such as difficulty in extraction.

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