Rope salvaging type hydraulic compulsory coring driller

Abstract

The invention provides a rope salvaging type hydraulic compulsory coring driller. The driller comprises an outer pipe assembly and an inner pipe assembly. A spring card blocking head, a spring card chamber, an outer pipe, a reamer, a righting ring and a coring drilling head are up-down successively assembled in the outer pipe assembly, so an up-down through cavity is formed. The inner pipe assembly is arranged in the outer pipe assembly cavity. A salvaging spearhead assembly, a spring card positioning mechanism, an in-place informing mechanism, a compulsory coring differential mechanism, a core blocking alarming mechanism, a single action mechanism, an inner pipe and a core converging jaw assembly. The driller is characterized in that a ball throwing assembly and a differential assembly are arranged on the compulsory coring differential mechanism; the compulsory coring differential mechanism achieves blocking of an overcurrent channel of drilling fluid of a lower part driller in a wayof throwing a steel ball in the inner pipe; and through the hydraulic force, pressure in increased so the lower part driller generates differential displacement, and the core converging jaw assembly to bear force to carry out inwards converge, thereby finishing compulsory coring processes. According to the invention, objectives of improving recovery factor and drilling-in coring efficiency duringdrilling-in coring in loosed and damaged complex stratums are achieved.

Description

technical field [0001] The invention relates to a core drilling tool, in particular to a rope fishing type hydraulic forced core drilling tool, which belongs to the technical field of drilling equipment. Background technique [0002] In order to grasp the underground geological conditions, the method of drilling and coring is usually used to directly obtain real and reliable underground rock formation data. The wireline coring method has the advantages of high drilling efficiency, low labor intensity, low cost, and fewer drilling accidents, and is widely used in exploration and drilling fields such as solid mineral geological exploration, complex formation drilling, hydrogeological exploration, and oil drilling exploration. . [0003] The core recovery rate is the most important indicator in drilling construction. When drilling and taking cores in complex strata such as loose, broken, poorly cemented, weak, and easy to erode, the core recovery rate is extremely low, and eve...

AI Technical Summary

Problems solved by technology

In the existing technology, the problem of low core recovery rate is mainly solved by forced core drilling tools, but at present, most of the forced core drilling tools are single-action double-tube drilling tools, which need to be lifted and cored, and the efficiency of drilling and coring is greatly reduced For this reason, a hydraulic pressurized wireline core drilling tool came into being. The hydraulic pressurized wireline core drilling tool can completely block the drilling fluid flow channel inside the downhole drilling tool through the hydraulic control reversing valve. , due to the relatively complex design of its pressurizing mechanism and high requirements for hydraulic and dynamic sealing, it is difficult to popularize and apply

[0004] In addition, the rope core drilling tools in the prior art also have the following two defects. One is that the inner tube positioning mechanism mainly includes steel ball positioning and single hinge point bullet positioning. Among them, the steel ball positioning method is ball and bullet positioning The chamber is in point or line contact, the steel ball and the ejection chamber are under severe local pressure, and the surface of the steel ball is easily flattened, which affects the retraction effect of the steel ball, especially when the core is severely blocked, the ejection chamber is under the force of the steel ball If it is extremely large, the ejection chamber is prone to expansion and cracking, and the lower drilling tools and drill bits are easy to fall off to the bottom of the hole, causing accidents in the hole; while the single hinge point ejection is under force on a plane, because the contact surface is flat, the ejection occurs when the core is blocked. Loss of turning space, prone to jacking phenomenon, unable to salvage the inner pipe drilling tool

The second is that the alarm gasket of the core blocking alarm mechanism is installed on the upper end of the single-action mechanism. When the core is blocked, the core pipe is forced to squeeze the alarm gasket, and the pressure is suppressed by blocking the drilling fluid flow space, and the alarm gasket completely blocks the waterway. Afterwards, the suppressed pressure is fed back to the drilling fluid pump until the operator finds out that it will take a period of time. During this period of time, the alarm gasket is easily over-extruded, and the alarm gasket cannot be retracted after it expands. The alarm gasket cannot pass through the seat ring in the outer pipe, and the inner pipe cannot be salvaged. Coring can only be carried out by lifting the drill, which greatly reduces the coring efficiency of the wireline coring tool

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