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High WOB anti-deviation well straightening drill assembly

A drilling tool assembly and deviation prevention technology, which is applied to drill pipes, drill pipes, directional drilling, etc., can solve the problems of complex results and increase manufacturing costs, and achieve obvious deviation prevention effect, excellent effect, and favorable drilling speed. Effect

Active Publication Date: 2017-05-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention patent requires the combination of a specially designed eccentric deflection lever structure pup joint with the drill bit, drill collar and centralizer to achieve the effect of reducing the well deviation, which increases the manufacturing cost and the result is relatively complicated

Method used

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  • High WOB anti-deviation well straightening drill assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one: Utilize above-mentioned drilling tool combination to carry out drilling operation in the wellbore of descending trend, when drilling, see figure 2 , the centralizer 4 acts as a fulcrum, used as a fulcrum, the upper thick drill collar 6 lies on the lower well wall, so that the upper thin drill collar 5 bows down in the middle, and the bottom rises, and the lower thin drill collar 3 bows in the middle, and the bottom hangs down, so that While the drill bit 1 bears the pendulum force of the lower coarse drilling tool 2, the drilling direction points to the descending direction, so as to apply a strong pendulum force to the drill bit and make the positive cutting surface of the drill turn to the descending direction to jointly prevent deflection and correct the deflection.

Embodiment 2

[0036] Embodiment two: Utilize above-mentioned drilling tool assembly to carry out drilling operation in the borehole of increasing deviation trend, when drilling, see image 3 , the centralizer 4 acts as a fulcrum, used as a fulcrum, the upper thick drill collar 6 lies on the lower well wall, so that the upper thin drill collar 5 bows down in the middle, and the bottom rises, and the lower thin drill collar 3 bows in the middle, and the bottom hangs down, so that While the drill bit 1 bears the pendulum force of the lower coarse drilling tool 2, the drilling direction points to the descending direction, so as to apply a strong pendulum force to the drill bit and make the positive cutting surface of the drill turn to the descending direction to jointly prevent deflection and correct the deflection.

Embodiment 3

[0037] Embodiment 3: Drilling operations are carried out in a straight wellbore by using the above-mentioned drilling tool assembly. During drilling, the lower thin drill collar 3 and the upper thin drill collar 5 are bent, so that the drilling tool assembly is in a vortex state. Drilling field application shows that the whirl state of the bottom hole assembly has the effect of preventing deviation and straightening. Therefore, when operating in a straight borehole, the above-mentioned drilling tool assembly of the present invention has the effect of preventing deviation and straightening.

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Abstract

The invention relates to a high WOB anti-deviation well straightening drill assembly comprises: a bit, a drill thick in lower part, a drill collar and a centralizer, the dill collar comprises a rill collar thin in the lower part, a rill collar thin in the upper part, a rill collar thin in the upper part, the bit, the drill thick in the lower part, the drill collar thin in the lower part , the centralizer, the drill collar thin in the upper part, the drill collar thick in the upper part is connected in turn. The device structure is simple, and is assembled with the common drill, the production cost and using cost are low, the performance is stable, other risks can't be taken to the drilling operation in the using process; the combination structure of the drill thick in the lower part, the drill collar thin in the lower part , the centralizer, the drill collar thin in the upper part, the drill collar thick in the upper part exerts a strong pendulum force to the drill to promote the organic unification of the two kinds of effect of anti-deviation well straightening which is the drill cutting face to the angle drop direction, the effect of anti-deviation well straightening is better, the anti-deviation effect is more obvious when the drill pressure is bigger, the performance is not limited by the downhole condition, the drilling speed can be increased; the device is also applied to the straight hole, the application scope is broad.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and relates to drilling equipment, in particular to a downhole drilling tool assembly in oil and natural gas drilling operations. Background technique [0002] The problem of direct exploration wells in high and steep formations and directional wells with anti-deviation and straight drilling has always been a technical problem in the drilling industry. This problem becomes more prominent as the drilling depth continues to increase. Currently proposed well deviation control tools include conventional drilling tools and automatic vertical drilling tools. Conventional drilling tools mainly include tower drilling tools, pendulum drilling tools, full-hole drilling tools, off-axis drilling tools, eccentric dual-center spiral stabilizer anti-deviation drilling tools, etc. These drilling tools are also called "passive anti-deviation tools", but Field application results show that the decli...

Claims

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Application Information

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IPC IPC(8): E21B7/10E21B17/16
CPCE21B7/10E21B17/16
Inventor 刘永旺管志川王恒史玉才
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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