Deposit sediment core drilling process suitable for seabed rope core drilling machine

Abstract

The invention discloses a deposit sediment core drilling process suitable for a seabed rope core drilling machine. The process comprises the following steps: 1) drilling down; 2) pure press-in suctiontype core drilling; 3) single action rotary press-in suction type core drilling; 4) core pulling; 5) rock core inner tube salvaging; 6) hole sweeping; 7) hole punching before rod adding; 8) rock coretube lowering; 9) drill rod adding; 10) hole punching after rod adding; 11) a step of repeating steps 2) to 10) until the core is drilled to given hole depth; 12) a step of recovering the drill rod and a rope core drilling outer tube drill tube; 13) a step of recovering the seabed rope core drilling machine. The deposit sediment core drilling process is suitable for a core drilling working condition where seabed deposit sediments are free from slurry lubrication and retaining walls; the deposit sediment core drilling process is advantaged by low disturbance and high coring rates, and the deposit sediment core drilling process can be suitable for remote control work modes.

Description

technical field [0001] The invention relates to a sediment core drilling process suitable for a seabed cable core drilling machine. Background technique [0002] Submarine rope core drilling rig is a large-scale technical equipment necessary for marine geological research, mineral resource exploration and submarine engineering survey. Submarine wireline core drilling rig refers to a type of drilling rig that lowers the drilling rig body from the mother ship to the seabed through the armored umbilical cable, and the operator performs remote control operation on the deck of the mother ship for submarine drilling. Compared with the offshore drilling rig, it has the advantages of small power, high mobility, high coring quality and high efficiency. The wireline coring process differs in that: [0003] (1) Flushing mud. Conventional land drilling rigs or large offshore drilling rigs use mud as the flushing fluid in the punching process. The mud has a good wall protection functio...

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Problems solved by technology

[0004] (2) Due to the lack of mud retaining walls, the probability of hole collapse after seawater core drilling rigs are punched with seawater is greater than that of conventional land drilling rigs or large offshore drilling rigs, and there is a risk that the new wireline core core tubes will not be lowered in place, and the The risk is hidden, and it is not easy to monitor and remedy. Therefore, secondary punching must be performed after the new wireline coring inner tube and drill pipe are lowered to ensure normal drilling next time.

[0005] (3) Since the submarine cable core drilling rig is a remote control device with a high degree of automation, once a drilling accident occurs, it cannot be intervened and handled by human measures like conventional land drilling rigs or large offshore drilling rigs (such as drill pipe unloading and unloading) and wireline coring inner tube salvage and lowering, etc.), making the drilling process of submarine wireline coring rigs must ensure high safety and reliability

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