Multi-stage diameter variable stabilizer

Abstract

The invention relates to a multi-stage diameter variable stabilizer, and belongs to the technical field of petroleum drilling tools. The stabilizer comprises an upper barrel, a lower barrel, a connector, a mandrel and a central tube; the connector is installed at one end of the upper barrel, the lower barrel is installed at the other end of the upper barrel through threads, and the central tube is installed in the lower barrel through a reset spring; the mandrel is installed on the central tube in a sleeving mode, the mandrel is a collapsable shaft, a stroke control wheel is installed at the small diameter of the lower end of the mandrel through a thrust bearing A and a thrust bearing B. The stabilizer is simple in structure, variable diameter process operation is easy and convenient, the underground safety and reliability are high, and the problems that an existing tool is complex in structure, tedious in on-site variable diameter process operation and low in underground safety and reliability are solved. By means of the stabilizer, the frequency of tripping of an underground drilling tool can be effectively reduced, the drilling efficiency can be effectively improved, and the drilling cost can be effectively lowered.

Description

technical field [0001] The invention relates to a multi-stage variable-diameter stabilizer, which belongs to the technical field of petroleum drilling tools. Background technique [0002] At present, domestic directional wells and horizontal wells often use curved screw rods to cooperate with downhole instruments such as MWD and LWD to control the wellbore trajectory. Trajectory requirements; In addition, when the well deviation changes abnormally and the deviation needs to be increased or decreased, the drilling tool assembly needs to be replaced, which increases the labor intensity and the risk of downhole accidents. At present, the remote control variable diameter stabilizers developed by Baker Hughes, Halliburton and other foreign companies can change the mechanical characteristics of the downhole drilling tool assembly by changing the diameter of the downhole stabilizer, which can better control the well deviation and meet the requirements of on-site deflection increase...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic directional wells and horizontal wells often use curved screw rods to cooperate with downhole instruments such as MWD and LWD to control the wellbore trajectory. Trajectory requirements; in addition, when the well deviation changes abnormally, when it is necessary to increase or decrease the deviation, the drilling tool assembly needs to be replaced, which increases the labor intensity and the risk of downhole accidents

At present, the remote control variable diameter stabilizers developed by Baker Hughes, Halliburton and other foreign companies can change the mechanical characteristics of the downhole drilling tool assembly by changing the diameter of the downhole stabilizer, which can better control the well deviation and meet the requirements of on-site deflection increase and decrease. It can reduce the number of trips of downhole drilling tools, improve drilling efficiency, and reduce drilling costs. However, it has the disadvantage of high purchase cost, and the technology in this area started relatively late in China, and the developed variable Compared with foreign countries, the diameter stabilizer still has a certain gap, and there are many problems such as complex tool structure, cumbersome on-site diameter changing process, and low downhole safety and reliability.

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