CN101929309A

CN101929309A - Gas lift reverse circulation drilling process

Info

Publication number: CN101929309A
Application number: CN 201010253618
Authority: CN
Inventors: 阴文行; 冯洪喜
Original assignee: HANDAN WEIYE UNDERGROUND HEAT DEVELOPMENT Co Ltd
Current assignee: Hebei Weiye Geothermal New Energy Technology Co.,Ltd.
Priority date: 2010-08-16
Filing date: 2010-08-16
Publication date: 2010-12-29
Anticipated expiration: 2030-08-16
Also published as: CN101929309B

Abstract

The invention discloses a gas lift reverse circulation drilling process. The process comprises the following steps of: (1) demounting a double-arm square drill rod, fully filling liquid into a core barrel, and re-arranging the double-arm square drill rod; (2) closing a high-pressure valve at an outlet of a dreg discharging pipe and starting an air compressor to supply air; and (3) when the air pressure is raised to 5.5 to 6MPa, quickly opening the high-pressure valve at the outlet of the dreg discharging pipe. The gas lift reverse circulation drilling process can solve the problem of dill water inlet blockage without needing pulling out all drilling tools.

Description

Gas lift reverse circulation drilling process

Technical field

The present invention relates to a kind of drilling technology, especially a kind of unpredictable incidents such as air compressor machine fault, gas circuit are poorly sealed, unexpected power failure takes place suddenly at drilling process and when causing drill bit water inlet eye to stop up, need not all extract the gas lift reverse circulation drilling process that all drilling tools just can solve the obstruction of drill bit water inlet eye.

Background technology

At present, in normal drilling process, unpredictable incidents such as air compressor machine fault, gas circuit are poorly sealed, unexpected power failure often take place.The drilling cuttings that accident takes place in the interior uphill process of back drilling tool just can fall, and causes circulation canal bottom (drill bit water inlet eye is with top) to be stopped up by drilling cuttings.After the accidents such as air compressor machine fault, gas circuit are poorly sealed, unexpected power failure for the treatment of are got rid of, can not recover normally to creep into, all drilling tools in the boring all must be extracted, manually dredge block part.Then with drilling tool successively again down to the shaft bottom, can recover normally to creep into.Finishing 3000 meters wells of above work needs 15-20 hour, even the longer time.Both consuming time, increased cost again, have a strong impact on well construction period simultaneously.Therefore, researching and developing a kind of all drilling tools of need not all extracting and just can solve the act reverse circulation drilling process that drill bit water inlet eye stops up, is the present technical issues that need to address.

Summary of the invention

Technical problem to be solved by this invention provides a kind of all drilling tools of need not all extracting just can solve the gas lift reverse circulation drilling process that drill bit water inlet eye stops up.

The technical scheme that the present invention solves its technical problem is:

Gas lift reverse circulation drilling process, its processing step is: 1. unload the both arms kelly bar earlier and fill with liquid in the core pipe, reinstalled the both arms kelly bar then, 2. close the high pressure valve in scum pipe exit, start the air compressor machine air feed, when treating that 3. admission pressure rises to 5.5-6Mpa, open the high pressure valve in scum pipe exit more rapidly.

Operating principle of the present invention is:

The Compressed Gas that enters circulation canal mixes with liquid at the blender place and forms gas-liquid mixture, close and to discharge by scum pipe because of the high pressure valve in scum pipe exit, under the situation that Compressed Gas injects continually, formed increasing gas-liquid mixture, during the gas-liquid mixture of some to be reached, certain pressure, open the scum pipe outlet valve rapidly, just formed huge suction force.This suction can be carried into ground with all drilling cuttings less than the core bore, reaches the order ground of mediation circulation canal.

Technical essential of the present invention:

1. the withstand voltage degree of circulation canal and valve, safety factor should be not less than 120%;

2. in air compressor machine rated operating pressure scope;

3. in the operation if the high pressure valve in scum pipe exit is not opened when reaching design pressure, must open the total atmospheric valve delivery system of air compressor machine pressure immediately, and ascertain the reason; Forbid not clear situation and equipment to be operated in spite of illness;

4. the liquid specific gravity that injects to the core pipe should be identical with the liquid specific gravity in the wellhole.

Compared with prior art, the present invention can improve drilling efficiency, shortens well construction period, alleviates driller's labour intensity, reduces production costs.

Description of drawings

Accompanying drawing is a principle schematic of the present invention.

1 is air compressor among the figure, 2 is gas pipeline, and 3 are the anti-recirculated water tap of gaslift, and 4 is the both arms kelly bar, 5 for being the core bar of double-wall drill pipe, 6 is the outer bar of double-wall drill pipe, and 7 is the double-wall drill pipe mixing chamber, and 8 is the borehole wall, 9 is the single wall drilling rod, 10 is drill collar, and 11 is drill bit, and 12 is scum pipe exit high pressure valve.

The specific embodiment

As shown in the figure, gas lift reverse circulation drilling process, its processing step is: 1. unload the both arms kelly bar earlier and fill with liquid in the core pipe, reinstalled the both arms kelly bar then, 2. close the high pressure valve in scum pipe exit, start the air compressor machine air feed, when treating that 3. admission pressure rises to 5.5-6Mpa, open the high pressure valve in scum pipe exit more rapidly.

Claims

1. gas lift reverse circulation drilling process, it is characterized in that: its processing step is: 1. unload the both arms kelly bar earlier and fill with liquid in the core pipe, reinstalled the both arms kelly bar then, 2. close the high pressure valve in scum pipe exit, start the air compressor machine air feed, 3. treat that admission pressure rises to enough when big, opens the high pressure valve in scum pipe exit more rapidly.

2. gas lift reverse circulation drilling process according to claim 1 is characterized in that: described admission pressure is 5.5-6Mpa.