Crawler and crawling method for continuous oil pipe

Abstract

The invention relates to a crawler and a crawling method for a continuous oil pipe. The crawler mainly comprises a front crawling device, a controller, a rear crawling device, a piston rod assembly and the like, wherein each crawling device consists of a pusher and a well wall fixator. The whole crawler is hydraulically controlled and driven, the front crawling device and the rear crawling deviceare controlled to alternately work by changing a supply channel of high-pressure drilling fluid, and the crawling devices convert the kinetic energy of the high-pressure drilling fluid into mechanical energy for pushing the continuous oil pipe and an underground tool to move forwards to the well bottom. By combining the specific characteristics of a continuous oil pipe drilling technology, the technical problem that the continuous oil pipe difficultly descends into a horizontal well section is well solved, and the development of a horizontal well drilling technology and the continuous oil pipe drilling technology is facilitated.

Description

technical field [0001] The invention relates to a crawler and a crawling method thereof which are used in coiled tubing drilling engineering and help the coiled tubing run into a longer distance in a horizontal well section. Background technique [0002] Coiled tubing technology is an economical, efficient, and environmentally friendly method of operation. This technology has great advantages in operations such as well washing, salvage, horizontal wells, extended-reach wells, and sidetracking of existing wells. It is one of the leading technologies for increasing production, exploiting unrecoverable reserves and enhancing ultimate recovery. At the same time, as the number of horizontal wells increases, the length of the coiled tubing in the horizontal well section increases, and the friction between the coiled tubing and the well wall increases. The horizontal driving force generated by the surface injector alone often cannot make the coiled tubing achieve the desired effect...

AI Technical Summary

Problems solved by technology

At the same time, as the number of horizontal wells increases, the length of the coiled tubing in the horizontal well section increases, and the friction between the coiled tubing and the well wall increases. The horizontal driving force generated by the surface injector alone often cannot make the coiled tubing achieve the desired effect. The difficulty of running the coiled tubing in the horizontal well section has also become one of the main factors restricting its development.

[0003] Although there are many types of crawlers currently used in oil drilling technology, these crawlers have more or less shortcomings and cannot better meet the needs of downhole operations.

The main reasons are: (1) Many crawlers are prone to rollover due to poor structural stability in underground wells that require large power and the environment is relatively harsh; (2) Poor adaptability to the inner diameter of the well wall, while oil and gas wells Some well sections are not regular enough, and there may be well sections with different diameters in the same well, especially in open-hole wells, which requires the crawler to be able to make appropriate automatic adjustments; (3) The electric drive crawler needs to operate continuously The cable is added to the tubing, which occupies a limited drilling fluid supply channel and has a small scope of application

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