NO851650L

NO851650L - DEVICE FOR A DRILLING PLANT.

Info

Publication number: NO851650L
Application number: NO851650A
Authority: NO
Inventors: Conny Strindberg
Original assignee: Tung Geotekniske Borrning Ab
Priority date: 1984-04-25
Filing date: 1985-04-25
Publication date: 1985-10-28
Also published as: SE8402249L; SE8402249D0

Description

Den foreliggende oppfinnelsen vedrører en anordning ved et boreanlegg, som omfatter en borestreng som strekker seg i ønsket boreretning og som dannes av et antall borerør som kan settes sammen i rad og som leder borefluid. The present invention relates to a device at a drilling facility, which comprises a drill string which extends in the desired drilling direction and which is formed by a number of drill pipes which can be assembled in a row and which conduct drilling fluid.

Ved såkalt senkboring i berg og andre jordlag er den borestrengen som benyttes og som ved den nedre enden fortrinnsvis oppviser en senkborhammer, beregnet til å skulle kunne forlenges etter som boredypet øker, ved at nye borerør koples sammen etter fråkopling av rotasjonshodet som kan tilsluttes borestrengen. Når derved rotasjonshodet koples løs fra borestrengen, som derved befinner seg i det borete hullet, prøver trykklufta eller annet tillempet borefluid som befinner seg i borerørene å strømme ut i atmosfæren. I denne stillingen opphører, på grunn av ute-blitt fortsatt tilførsel av borefluid, spyleluftstrømmen i den dannete spalten mellom borestreng og borehullsvegg. En vannsøyle kan dannes, på grunn av vanninnstrømning til hullet, i borehullet, og derved kan også boreslam og vann trykkes inn i borene til borerørets indre rom. Samtidig synker boreslam, som under boringen påvirkes av spyleleufta til å stige oppover i borehullet langs borestrengens ytre parti, tilbake mot borehullets bunn, og kan derved danne såkalte "propper", som vanskeliggjør oppstarting av boremaskinen etter borerørsammenføyningen. In the case of so-called sinkhole drilling in rock and other soil layers, the drill string that is used and which at the lower end preferably has a sinker hammer, is designed to be able to be extended as the drilling depth increases, by connecting new drill pipes together after disconnecting the rotary head that can be connected to the drill string. When the rotary head is thereby disconnected from the drill string, which is thereby located in the drilled hole, the compressed air or other applied drilling fluid located in the drill pipes tries to flow out into the atmosphere. In this position, due to the continued supply of drilling fluid being omitted, the flushing air flow in the formed gap between the drill string and the borehole wall ceases. A water column can form, due to water inflow to the hole, in the borehole, and thereby drilling mud and water can also be pushed into the drills into the inner space of the drill pipe. At the same time, drilling mud, which during drilling is influenced by the flushing air to rise up in the drill hole along the outer part of the drill string, sinks back towards the bottom of the drill hole, and can thereby form so-called "plugs", which make it difficult to start up the drilling machine after the drill pipe joint.

Hovedformålet med den foreliggende oppfinnelsen er for det første å frambringe en anordning av det ovenfor angitte slaget, som løser ovenfor nevnte problem og mulig-gjør rask og problemfri oppstarting av boremaskinen etter stans av boringen og utført boresammeneføynings-operasjon. The main purpose of the present invention is, firstly, to produce a device of the type indicated above, which solves the above-mentioned problem and enables quick and problem-free start-up of the drilling machine after stopping the drilling and performing the drill joining operation.

Dette formålet oppnås ved hjelp av en anordning i samsvar med den foreliggende oppfinnelsen, som i hovedsak karakteriseres ved at minst en tilbakeslagsventil, som er anordnet for å forhindre gjennomstrømning av bl.a. borefluid i motsatt retning av det som er ønskelig, kan opptas i borestrengens indre rom. This purpose is achieved by means of a device in accordance with the present invention, which is essentially characterized by at least one non-return valve, which is arranged to prevent the flow of e.g. drilling fluid in the opposite direction to what is desired can be taken up in the inner space of the drill string.

Oppfinnelsen blir i det følgende beskrevet som et foretrukket utførelseseksempel, idet det henvises til de vedlagte tegningene, der The invention is described in the following as a preferred embodiment example, referring to the attached drawings, where

fig. 1 viser et snittriss av en borestreng i om-rådet mellom to borerør, med en tilbakeslagsventil opptatt i sitt indre rom vist i en skjematisk såkalt "borings-stilling" hhv. "borestansstilling", fig. 1 shows a sectional view of a drill string in the area between two drill pipes, with a non-return valve occupied in its inner space shown schematically in a so-called "drilling position" or "drill stop position",

fig. 2 viser et prinsippriss av en framgangsmåte for boring med en anordning anordnet i samsvar med oppfinnelsen, fig. 2 shows a principle view of a procedure for drilling with a device arranged in accordance with the invention,

fig. 3 og 4 viser en ytre hhv. en indre holder eller et hylster som går inn i en tilbakeslagsventil, og fig. 3 and 4 show an outer resp. an inner retainer or sleeve that fits into a check valve, and

fig. 5 viser tilbakeslagsventilen i montert til-stand . fig. 5 shows the non-return valve in assembled condition.

I fig. 2 vises skjematisk et boreanlegg 1 der en i samsvar med oppfinnelsen anordnet anordning inngår. En fortrinnsvis mobil borerigg 2, som omfatter en kompressor 3, er anordnet for å bære et borerotasjonshode 4 via støtte 5, med tilførsel av hensiktsmessig borefluid, fortrinnsvis trykkluft, via ledninger 6, som leder fra kompressoren 3. En borestreng 7, som dannes av et antall borerør 8 som kan settes sammen i rekke og som i sitt indre er utformet for å kunne lede borefluid i sin lengderetning, kan knyttes til bore- rotasjonshodet 4. In fig. 2 schematically shows a drilling system 1 in which a device arranged in accordance with the invention is included. A preferably mobile drilling rig 2, comprising a compressor 3, is arranged to carry a drilling rotation head 4 via support 5, with the supply of appropriate drilling fluid, preferably compressed air, via lines 6, which lead from the compressor 3. A drill string 7, which is formed by a number of drill pipes 8 which can be put together in a row and which are internally designed to be able to guide drilling fluid in their longitudinal direction, can be connected to the drilling rotation head 4.

Oppfinnelsestanken er å sette inn et hensiktsmessig antall tilbakeslagsventiler 9, idet minste én, i borestrengens indre rom 10, for å ved avbrudd av borefluid-tilførselen forhindre bl.a. at borefluid strømmer tilbake i retning mot den tiltenkte boreretningen, som på tegningen er markert med henvisningstallet 11, men tillate gjennomstrømning av borefluid i boreretningen 11 i normale tilfeller. The idea of the invention is to insert an appropriate number of non-return valves 9, at least one, in the inner space 10 of the drill string, in order to prevent, among other things, interruption of the drilling fluid supply. that drilling fluid flows back in the direction towards the intended drilling direction, which is marked in the drawing with the reference number 11, but allow drilling fluid to flow through in the drilling direction 11 in normal cases.

En tilbakeslagsventil 9 kan dannes av to rør hhv. 12 og 13, med det ene røret 13 opptatt i et indre rom 14 i det ytre røret 12. Det indre røret 13 er plassert slik at det danner en holder for påvirkningselement 15. Elementet 15 befinner seg ved rørets 13 ene ende 13A og strekker seg på tvers av den tiltenkte boreretningen 11 . og er fortrinnsvis utformet som et lokk. Påvirknings-elementets 15 funksjon blir forklart senere. Det ytre røret 12 er anordnet for å danne et ventilhylster for det opptatte indre røret 13. Via en lagring 16, som fortrinnsvis omfatter en aksel 17 som strekker seg på tvers av rørenes lengderetning, som med sine,respektive ender hhv. 17A og 17B opptas ubevegelig i hvert sitt passende hull hhv. 18 og 19 i mantelen 20 i det ytre røret 12, fastholdes det indre røret 13 til å bevege seg i en begrenset strekning i sin lengderetning ved at akselen 17 opptas av en slisseformet åpning 21 hhv. 22, som strekker seg gjennom mantelen 23 i det indre røret 13. Slik tillates det indre røret 13 å forskyves i hylsterrørets lengderetning mellom en, sett i boreretningen 11, fremre "borestilling" I hhv. en bakre "borestansstilling" II. A non-return valve 9 can be formed from two pipes or 12 and 13, with the one tube 13 occupied in an inner space 14 in the outer tube 12. The inner tube 13 is positioned so that it forms a holder for the impact element 15. The element 15 is located at one end 13A of the tube 13 and extends across the intended drilling direction 11 . and is preferably designed as a lid. The function of the influence element 15 is explained later. The outer tube 12 is arranged to form a valve sleeve for the occupied inner tube 13. Via a bearing 16, which preferably comprises a shaft 17 which extends across the longitudinal direction of the tubes, which with their respective ends or 17A and 17B are recorded motionless in each of the appropriate holes, respectively. 18 and 19 in the mantle 20 in the outer tube 12, the inner tube 13 is held to move in a limited distance in its longitudinal direction by the shaft 17 being occupied by a slot-shaped opening 21 or 22, which extends through the mantle 23 in the inner tube 13. In this way, the inner tube 13 is allowed to be displaced in the longitudinal direction of the casing tube between a, seen in the drilling direction 11, forward "drilling position" I or a rear "drill stop position" II.

Et flertall langs omkretsen av begge rørene 12, 13 fordelt gjennom rørmantlene 18 hhv. 23 seg strekkende og som kan tilknyttes til hverandre, gjennomstrømnings-passasjer 24 hhv. 25 er anordnet parvist, sett i forhold til begge rørene 12, 13, og er fortrinnsvis anordnet i rekker, som er fordelt langs rørenes omkretsretning. Hensiktsmessig frambringes disse gjennomstrømnings-passasjene 24,25 som strekker seg radielt ved boring siden rørene er montert sammen, og for å frambringe eksakt inn-stilling for disse. Passasjene 24,25 er anordnet for å holdes i en "åpen stilling" iHhhv. en "stengt stilling" IV etter forskyvning av det indre røret 13 til "bore-stillingen" I hhv. "borestansstillingen" II. A majority along the circumference of both pipes 12, 13 distributed through the pipe jackets 18 respectively. 23 extending and which can be connected to each other, flow-through passages 24 respectively. 25 are arranged in pairs, seen in relation to both pipes 12, 13, and are preferably arranged in rows, which are distributed along the circumferential direction of the pipes. Appropriately, these flow-through passages 24, 25 are created which extend radially by drilling since the pipes are assembled together, and to create an exact setting for them. Passages 24,25 are arranged to be kept in an "open position" iHhv. a "closed position" IV after displacement of the inner tube 13 to the "drilling position" I respectively. "drill stop position" II.

En holderring 26 er hensiktsmessig anordnet ved det ytre røret 12 ved dettes, sett i boreretningen 11 bakre ende 12A og er anordnet for å begrense påvirknings-elementets bevegelse forbi dette ved samvirkning med elementet 15. A retaining ring 26 is suitably arranged at the outer tube 12 at its, seen in the drilling direction 11, rear end 12A and is arranged to limit the movement of the impact element past this by interaction with the element 15.

Ved det ytre rørets fremre ende 13B, sett i boreretningen 11 er anordnet en holderring 27 eller en annen hensiktsmessig festedel, som egner seg til å opptas i et rom 28, som dannes mellom endene hhv. 8A og 8B av to inntil hverandre i rekke sammenkoplingsbare borerør 8. At the front end 13B of the outer tube, seen in the drilling direction 11, a retaining ring 27 or another appropriate fastening part is arranged, which is suitable for being accommodated in a space 28, which is formed between the ends or 8A and 8B of two next to each other in a series of connectable drill pipes 8.

Funksjonen av den ovenfor beskrevne oppfinnelsen er med henvisning først og fremst til fig. 1 denne: Inn-ført med det indre røret 13 lagret fastsatt i det ytre røret 12 bevegelig langs de slisseformete åpningene 21,22 gjennom den nedre munningsåpningen 8A i et øvre borerør, og ved hvilket innvendig beliggende gjengeorgan 29 kan være anordnet, fastholdes tilbakeslagsventilens holderring 27 etc. i det dannete rommet 28, som oppstår når et nedre borerør 8, med sin øvre ende 8B sammenkoples med det øvre borerøret 8 via ytre gjengeorgan 30. Når trykkluft eller annet hensiktsmessig borefluid tilføres den dannete borestrengen 7 ved den øvre enden 7A, i samme retning 31 som boreretningen 11, påvirker trykklufta etc. lokket 15 etc. til å prøve å forskyve det indre røret 13 mot dettes såkalte borestilling I, ved hvilken passasjene 24,25 befinner seg rett overfor hverandre, i en såkalt "åpen stilling" III, og tillater at trykklufta passerer gjennom tilbakeslagsventilen 9 osv. for å brukes ved boringen. Når trykk-Vetc. The function of the invention described above is with reference primarily to fig. 1 this: Inserted with the inner tube 13 bearing fixed in the outer tube 12 movable along the slit-shaped openings 21,22 through the lower mouth opening 8A in an upper drill pipe, and by which internally located threaded means 29 can be arranged, the non-return valve retaining ring is held 27 etc. in the formed space 28, which occurs when a lower drill pipe 8, with its upper end 8B, is connected to the upper drill pipe 8 via external threaded means 30. When compressed air or other appropriate drilling fluid is supplied to the formed drill string 7 at the upper end 7A, in the same direction 31 as the drilling direction 11, the compressed air etc. influences the cover 15 etc. to try to displace the inner tube 13 towards its so-called drilling position I, in which the passages 24,25 are located directly opposite each other, in a so-called "open position" III, and allows the compressed air to pass through the non-return valve 9 etc. to be used in the drilling. When pressure-Vetc.

lufttilførselenVavbrytes, ved f.eks. borsammenf øyning^ vil den tilførte trykklufta, som har passert ventilen 9, bore-væske etc. påvirke lokket 15 i retningen 32 slik at det indre borerøret 13 forskyves i retning oppover, motsatt rettet den tiltenkte boreretningen 11, slik at lokket 15 kommer til endestillingen til anslag mot holderringen 26, og innerrøret 13 befinner seg i den bakre stillingen, såkalt "borestansstilling" II, med passasjene 24,25 for-skjøvet i forhold til hverandre, til en "stengt stilling" IV, der gjennomstrømning av disse forhindres. Borsammenføyning med enkel og rask oppstarting av anlegget 1 kan deretter skje. the air supply is interrupted, e.g. drill joining^ the supplied compressed air, which has passed the valve 9, drilling fluid etc. will affect the cap 15 in the direction 32 so that the inner drill pipe 13 is displaced in an upward direction, opposite to the intended drilling direction 11, so that the cap 15 comes to the end position to abut against the retaining ring 26, and the inner tube 13 is in the rear position, so-called "drill stop position" II, with the passages 24,25 offset in relation to each other, to a "closed position" IV, where flow through them is prevented. Drill jointing with simple and quick start-up of plant 1 can then take place.

Oppfinnelsen er ikke begrenset til utførelses-eksemplet som er beskrevet ovenfor og vist på tegningene, men kan varieres innenfor rammen av patentkravene uten at en fraviker oppfinnelsesideen. Ensempelvis kan tilbakeslagsventilen vendes motsatt av den viste retningen, hvor-ved imidlertid funksjonen blir i hovedsak omvendt det som er nevnt og at passasjene må anordnes slik at de er åpne hhv. lukket når lokket befinner seg i anslag med holderringen hhv. når lokket befinner seg i avstand fra dette. The invention is not limited to the embodiment described above and shown in the drawings, but can be varied within the scope of the patent claims without deviating from the inventive idea. In simple terms, the non-return valve can be turned opposite to the direction shown, in which case, however, the function is essentially the reverse of what has been mentioned and that the passages must be arranged so that they are open or closed when the lid is in contact with the retaining ring or when the lid is at a distance from it.

Claims

1. Device at a drilling facility (1), which comprises a drill string (7) which extends in the desired drilling direction (11) and which is formed by a number of drill pipes (8) which can be assembled in a row and conduct drilling fluid, characterized in that at least one non-return valve (9), which is arranged to prevent the flow of e.g. drilling fluid in the opposite direction to the desired drilling direction (11) can be taken up in the inner space (10) of the drill string.

2. Device in accordance with claim 1, characterized in that the non-return valve (9) is arranged so that it is received with a fastening part (27) between two drill pipes (8) that can be connected to each other.

3. Device in accordance with claims 1-2, characterized in that the check valve (9) comprises an impact element (15) which extends across the drilling direction (11) and can be influenced by drilling fluid, as well as a number of flow passages (24,25) which preferably extends radially, for added drilling fluid.

4. Device in accordance with claim 3, characterized in that the impact element (15) is connected to a holder (13), which is movable in relation to a tubular valve sleeve (12) which accommodates the holder.

5. Device in accordance with claim 4, characterized in that the holder (13) and the sleeve (12) are formed by an inner or an outer tube, which is connected to each other via a bearing (16) which extends across their direction of movement, so that the holder tube (13) can be displaced in the longitudinal direction of the casing tube between a, seen in the drilling direction (11), forward "drilling position" (I) respectively a rear "drill stop position" (II).

6. Device in accordance with claim 5, characterized in that the bearing (16) comprises a shaft (17) which extends across the longitudinal direction of the pipes, this shaft being immovably connected to the casing pipe (12) and occupied in a slot-shaped opening (21) ,22) in the holder tube (13).

7. Device in accordance with one of the claims 5-6, characterized in that a plurality of connectable flow passages (24,25) distributed along the circumference of both pipes (12,13), preferably produced by drilling, are arranged in pairs, seen in relation to both pipes (12,13) and is arranged to be held in an "open position" (III) or a "closed position" (IV) after displacement of the holder tube (13) to the "drilling position" (I) or "the drilling stop position" (II).

8. Device in accordance with claim 7, characterized in that the passages (24,25) are arranged in rows, which are distributed along the circumferential direction of the pipes.

9. Device in accordance with one of the claims 5-8, characterized in that the casing tube (12) has a stop ring (26) at its rear end (12A), seen in the drilling direction (11), and that the impact element (15) which is designed as a cap may act in conjunction with the stop ring (26) to limit its continued movement.

10. Device in accordance with claims 5-9, characterized in that the sleeve tube (12) has a retaining ring (27) at the front end (12B) of the tube, seen in the drilling direction (11), which forms the attachment part for the non-return valve (9).