Ocean deep drilling exploration and well drilling operation drill column suspending method

Abstract

The invention relates to an ocean deep drilling exploration and well drilling operation drill column suspending method. Pulling-out includes the following steps that 1, stands and temporary connectingdrill rods are arranged in a well; 2, the stands are clamped by a ground hydraulic elevator, and the stands are fixedly suspended; 3, a top drive hydraulic elevator descends to a low position, and the temporary connecting drill rods are buckled; 4, the top drive hydraulic elevator is lifted, the ground hydraulic elevator is loosened after the top drive hydraulic elevator is stressed, and the ground hydraulic elevator is moved away from a well mouth; 5, the stands are lifted by the top drive hydraulic elevator; 6, after upper connectors of the drill rods at the uppermost ends of the stands arelifted to corresponding heights, the ground hydraulic elevator is moved in again, and stand connectors are clamped; 7, the top drive hydraulic elevator descends, the weights of drill columns are released, and the ground hydraulic elevator bears the weights; and 8, the stands are lifted by the top drive hydraulic elevator. The bearing capacity of the drill columns is improved, bearing points are changed, the problem about switching of the power elevators is solved, harm of slip clamping to the drill columns is reduced, and the problem of difficult screwing-on is solved.

Description

technical field [0001] The invention relates to the technical field of an ocean drill string suspension method, in particular to a drill string suspension method for deep ocean drilling operations. Background technique [0002] Offshore (Ocean) Drilling Drilling operations are usually mainly vertical wells, and cores are mainly obtained by wireline coring. In order to meet the requirements of wireline coring, large-diameter drilling tools are usually used for drilling and coring operations. In order to drill through the Moho surface , To realize the dream of geoscientists, the vertical depth of drilling can reach 11,000 meters, and the weight of the entire drilling tool exceeds 450 tons. In the working conditions of deep water and deep drilling in sea areas, each tripping and drilling operation poses a great challenge to the suspension method and tools of the drilling tool. There are two kinds of suspension methods, but neither of these two methods can meet the requirements...

AI Technical Summary

Problems solved by technology

In the deep ocean drilling, the drill string is very heavy, resulting in a large lateral force on the drill string, which makes the slips produce deeper tooth marks on the drill string. The long-term use of the slip method makes the tooth marks deeper and deeper. , shorten the service life of the drill string, and even crush the drill string

[0004] As for the manual double-elevator method, it is usually used in land drilling and drilling operations. The use of dual manual elevators can greatly improve the carrying capacity and protect the joints, but the current manual double-elevator method can only be adapted to land with low automation. The land drilling rig, with the help of the land drilling rig and the use of manual buckle elevators, cannot be used on the current automated offshore platforms and drilling ships

However, the Japan Earth Drilling Ship adopts the hydraulic double elevator method, but the hydraulic pipeline and elevators need to be switched every time it is drilled and connected to the column. There are many joint failures, which may easily lead to hydraulic oil leakage, and the efficiency of switching elevators is low.

At the same time, double elevators are used, resulting in a lower position of the joint, which requires a special make-up tool

Therefore, there is not yet a kind of drill string suspension method that can be well adapted to ocean deep drilling operations.

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