Quaternary system rotation rope coring device for balancing wave heave

Abstract

The invention provides a quaternary system rotation rope coring device for balancing wave heave, which relates to the technical field of drilling. The quaternary system rotation rope coring device includes an outer pipe assembly, an inner pipe assembly arranged in the outer pipe assembly and a seat ring arranged on the inner wall of the outer pipe assembly. The inner pipe assembly includes a hanging mechanism, a wave heave balancing mechanism, an adjustment single action mechanism and a rock core pipe, which are successively connected from top to bottom; the wave heave balancing mechanism includes an alarm plug short connection piece, a hydraulic cylinder and a stopper, a piston assembly, a hollow piston rod and a water division joint, wherein the alarm plug short connection piece, the hydraulic cylinder and the stopper are successively connected from top to bottom, and the piston assembly, the hollow piston rod and the water division joint are successively connected from top to bottom; when the piston assembly reaches an upper extreme position, the water division joint contacts the stopper, and a plug body stretches into a slide valve water inlet channel; and when the piston assembly reaches a lower extreme position, the piston assembly contacts the stopper. The quaternary system rotation rope coring device can be applied to a drilling coring process, when the outer pipe assembly heaves with a ship, a tool bit tightly compresses a hole bottom all the time, and the situation that the rock core pipe heaves with the outer pipe assembly can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a quaternary rotary rope corer for balancing wave heave. Background technique [0002] Offshore engineering drilling and coring technology is an important means of geological exploration, mining development, water resources, oil and gas exploration, basic engineering and environmental science engineering. At present, the country pays more and more attention to marine exploration. Wave heave has always been a difficult problem in ocean drilling and coring. There are two methods of drilling and coring to balance wave heave, including active compensation and passive compensation. The active compensation method is expensive. Considering the cost of geological drilling in the shallow sea area of ​​my country’s continental shelf, the drilling ship generally adopts the passive compensation method. The passive compensation is not sensitive to wave heave, and the effect is not ideal. Th...

AI Technical Summary

Problems solved by technology

The conventional wireline corer while drilling does not have heave compensation function. Therefore, during the drilling and coring process, the core tube moves up and down together with the outer tube assembly, causing problems of core grinding and plugging, resulting in core failure

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