DE202004020879U1 - Drilling mud charging device for deep well-boring drill string, allowing quicker turn round of string extensions, has valve closable supply inlet and connector to string at top drive - Google Patents

Abstract

A charging device for filling a deep-well boring string, or one or more drill tools, with drilling mud comprises a hollow cylindrical piston (9, 5) a depressurization/pressurization connection (10) and a spindle connected, twin opposed-seat, valve member which can give opening only alternatively either to mud supply or drill string by axial movement of the piston (9).

Description

The The invention relates to a filling device for Fill up of drilling fluid in drill pipe or in drill trains a drill string, as used in oil or gas wells Find.

At the Operation of drilling equipment for deep drilling, in particular for the development of Oil- or natural gas deposits Drilling methods are used in which drilling fluid filled in the drill string of a drill string in certain compositions and directed to the drill head. For this purpose, the individual drill pipes are hollow cylindrical formed and at the ends with openings for the passage of drilling fluid provided to the drill head.

through Pumping device in the area of the platform becomes the drilling fluid while of the drilling process passed through the drill string in the wellbore and high pressure nozzles through nozzles located at the bit Drilled hole. The resulting in drilling operation cutting residues are thus continuous from the teeth removed the cutting tool and its necessary cooling secured.

there should be the fluid level the cavity of the borehole as possible Completely fill out and close to the surface the drilling platform. Because in addition to the very important reduction the friction losses of the drill string protects the drilling fluid also against uncontrollable gas leakage, so-called blow-outs and serves to transport the cuttings from the bottom of the borehole in drilling mud traps of the drilling platform.

Of the Drill strand itself consists of a variety of each other coupled drills, which in turn has several drill pipes include.

In dependence from the drilling progress achieved and the final depth to be achieved of the borehole, the drill string must be constantly extended by new drill string. The drill pipe become drills summarized and by the elevator on the platform to the borehole transported and coupled to the drill string. To maintain the necessary drilling fluid level in the borehole, which also for an effective circulation of the drilling fluid is important must with the extension be supplied to the drill string and drilling fluid.

Mach After completion of the drilling, the drill string will be off in most cases removed from the borehole and casings for stabilization and lining used the borehole.

Especially also for cost reasons it is desirable the individual steps in the extension of the drill string and maintaining an optimal well level in the wellbore with minimal time and a user-friendly and reliable technology perform.

this The aim was to undergo numerous development work in the drilling technique. A special emphasis is also placed on those in the patent literature in detail described tools and technical support facilities, which are used for Fill up and for circulating drilling fluid be used.

there find the constructive optimization, the trouble-free operating time, as well as the procedural minimization of changeover times Of the tools developed special attention.

So For example, many devices have been proposed which a simultaneous replenishment of the drill string and the circulation of drilling fluid between the drill string and allow the casing. Such known filling devices are mostly cylindrical housings, with a pressure-actuated and axially displaceable valve for opening and closing the Conduction path of the drilling fluid in the drill pipe accommodated.

to filling of casings of a drill string are usually called filling valves coupled to the drill string and partly in the with drilling fluid be refilled Lowered casing, where then the supplied by pumping drilling fluid on different designed closable openings and nozzles is discharged into the annulus between drill string and casing.

The filling valve also prevents the unwanted backflow contaminated drilling fluid, Also called drilling mud in the drill string after switching off the Pump.

Some technical solutions use tools that are advantageously connected to the top drive drive of the rig, in particular screwed and also a pressure-operated inlet valve show that by the flowing drilling fluid open becomes.

So will in the EP 929731 B1 discloses a very complex filling and circulating device for drilling rigs, which discloses the partial filling of casings in a well with drilling fluid. In this case, the drilling fluid by means of a in the Drilling tool hooked filling tool added to each casing to be used. The liquid inlet via inlet nozzles, which are protected by a Bohrschlamm valve device against the temporarily out of the wellbore drilling mud. This known auxiliary tool should also allow the circulation of the drilling fluid and the cementing of the casing in the borehole. The multi-functional capability to be achieved, however, requires a complicated structure and a high susceptibility to failure of the device.

From the EP 774564 A2 Also, a drilling fluid refilling apparatus is known which discharges the drilling fluid into the freed annulus between the drill string and the walls of the wellbore.

The here described cylindrical filling is bolted to the top drive of the elevator and the tubular drill string. The one or more laterally arranged outlet opening for the dispensed drilling fluid provided cylindrical walls can through a valve slidable between two positions can be closed.

The padding also applies to the cementing of casings and must both for filling the borehole with drilling fluid, as well as being lowered into the well for cementing.

Other generic filling devices are also described in US 2002/0189814 A1 and the EP 939193 A2 described.

All these prior art devices, whether only for refilling or also for combined filling and circulating drilling fluid have numerous disadvantages.

So is often a time-consuming procedure for coupling and decoupling the in front of known filling tools and auxiliary equipment to the drill pipe or the Bohrzug necessary as well as a complicated and trouble-prone lowering in the borehole. Also, with these facilities no filling the Cables to be coupled while their installation in the drill string possible.

The with backwashed drilling mud contaminated and slidably arranged valve parts, as well as their outlet openings clog up and have to be time consuming getting cleaned.

It It is therefore an object of the present invention to provide a device with which these disadvantages are eliminated and a fast, time-saving and reliable Fill up of drills with drilling fluid guaranteed becomes.

These The object is achieved by the inventive filling device according to the characterizing features of claim 1.

In the dependent claims are further advantageous embodiments and refinements of Invention specified.

The inventive solution relates to a filling device and a method for filling a drill string, from drill pipes or drills with drilling fluid.

The inventive method using the filling opens the Possibility, the drill trains while their installation in the drill string to fill with drilling fluid. To the inlet-side filling opening of the filling through the opening movement of the filling piston by drilling fluid pressure open and at the same time the flow path into the drill rigs Approved.

The Shut down the filling device takes place according to the invention Application of an external compressed gas source, which via a connection valve, a pressure medium supplied and the filling piston in a closed position emotional.

basics Components of the inventive filling device are a cylindrical Basic body, the a piston chamber with at least one closable filling opening for drilling fluid and an end piece for coupling the filling device to the top drive drive of the drill string.

The inventive filling device is further characterized in that a hollow cylindrical filling piston for dispensing drilling fluid in the drill string in the piston chamber of the cylindrical body axially movably sliding.

In the cavity of the filling piston also attacks an axially movable piston valve and thus acts with the Piston chamber together, that one through the drilling fluid pressure caused opening position and one by an external media pressure, in particular compressed air effected closing positions is ingestible and effective.

The inventive device is preferably for refilling of drills or drill pipes with drilling fluid while their installation used to reposition the drill string.

For this, the filling device on the Bohr platform mounted in the coupling device of the elevator and connected to the pump system for the supply of drilling fluid, and an external pressure medium source for actuating the filling valve.

With this device according to the invention it is not necessary to lower the "filling opening" of the tool into the borehole or casing or to couple it to the drill string,
which leads to considerable time savings when repositioning the drill string
Details of the invention will now be explained in more detail with reference to drawings and an embodiment.

It demonstrate:

1 The filling device according to the invention in the open position

2 The filling device with closed filling piston 9

The embodiment refers to the filling device according to the invention of drilling fluid in a Bohrzug the extension of the drill string during the installation is used. In dependence of the depth of the hole to be reached, this process must be repeated very often become. The frequency the extension of the drill string to be used and replenished, and the one for that needed changeover are influenceable by the technology used optimization variables. The single drill pipe or the Bohrgestänge summarized into a Bohrzug then hooked in the elevator, coupled with the downhole drill string, as well as in lowered the borehole.

For coupling to the top drive drive of the elevator, the filling device according to the invention is bolted to an intermediate piece Schonstück. This is the cylindrical body 1 the filling device with a tail 2 provided with a corresponding screw thread designed as coupling means ( 1 ).

The filling device also has a connection 10 for feeding and discharging print media 16 , As a pressure medium compressed air is usually used because of the easy availability on drilling platforms.

The external controllable compressed air source, which is designed in particular as a pneumatic control unit, is then connected to the connection by means of a compressed air hose 10 the filling device connected and secured against rotation.

The connection valve 10 for the compressed air is via a pressure channel with the gas-tight closed cylindrical space between the outer surface of the filling piston 9 and the inner surface of the piston chamber 5 m connected.

Other essential components of the filling device are also in the main body 1 arranged piston valve 4 and the cooperating with the piston valve hollow cylindrical filling piston 9 ,

The piston valve 4 includes an inlet-side valve disk 6 that is in common with an outlet side valve plug 7 at a certain distance from each other on a valve guide rod 8th are arranged. The valve guide rod 8th extends on the inlet side through the filling opening 3 at the stop / valve seat 14 and is connected to a disc via the one through the between the disc and the valve seat 14 arranged valve return spring 11 a restoring force for closing the valve disk 6 of the piston valve 4 exercises.

The at the outlet end of the valve guide rod 8th arranged valve plug 7 is dimensioned and provided on its circumference with inner sealing lips that it into the opening of the hollow cylindrical filling piston 9 penetrate and can close this.

The tubular filling piston 9 itself is axially slidable in the piston chamber 5 arranged and inlet side as a ring stop 12 formed with a groove, which gas and media density with the inner wall of the piston chamber 5 concludes.

in the The following is the operation of the filling device according to the invention be explained in more detail.

After coupling of the filling device to the top drive of the drill string means Schonstück or adapter and screw, the connection of the Bohrflüssigkeitszuleitung and the compressed air via the connection valve 10 the compressed air space between the outer filling piston 9 and inner wall of the piston chamber 5 Relieves, so that the filling piston 9 in the outlet direction to the pipe opening of the Bohrzuges from the body 1 moved out and the valve plug 7 the outlet opening of the filling piston releases. On the pneumatic control unit (not shown) the corresponding lever must be set to the "Piston down" position.

Now, the ring pump for supplying the drilling fluid in the state to start and the flowing through a pressure hose, the top drive drive and the Schonstück drilling fluid opens against the spring force of the valve return spring 11 the valve disc 6 and gives the filling opening 3 the piston chamber 5 free.

So the drilling fluid passes through the piston chamber 5 into the tube opening of the filling piston 9 which forwards them into the boring cable to be filled.

For example, the filling piston is pushed downwards by approx. 9 bar by a flushing pressure of the drilling fluid until the internal piston valve 4 the flow path into the hollow filling piston rod 9 free.

Of the Stroke of the filling piston should be about 60 cm here. But there are also other stroke parameters according to the design requirements of other drilling rigs detected by this invention.

The Filling speed filled with the now the Bohrzug preferably should not exceed 250 l / min.

After completing the filling process and switching off the ring pump, the valve closes and leads to the emptying of the piston chamber 10 and the filling piston.

To becomes the shift lever arranged on the pneumatic control unit in the position "Piston up ".

Thereby the filling piston pulls into the piston housing back.

Around the ejection of the drilling fluid too Avoid, preferably, a train should remain dry and that too pumping volumes previously calculated and at the drilling fluid pumping device be set.

After completion of the filling process, the ring pump is switched off on the drilling platform, and there is the automatic emptying of the piston chamber 5 ,

By actuating the "Piston up" lever of the pneumatic control unit, compressed air is supplied via the connection valve 10 into the piston chamber 5 pumped and the filling piston 9 upwards in the direction of the filling opening 3 moved (starting position).

By the closing movement of the filling piston 9 closes the valve plug 7 the hollow filling piston rod 9 and the valve plate 6 of the piston valve 4 is against the valve seat 14 pressed. The closure of the filling opening 3 through the valve plate 6 is also due to the return spring 11 supported.

For effective and trouble-free operation of the filling device is in this preferred embodiment, a flushing pressure of the drilling fluid of minimum 9 bar and a compressed air supply to the ring floor of at least 7 Bar provided.

Next ease of use and quick assembly or disassembly the filling device is also their permanently reliable Operation of particular advantage. The risk of clogging and contamination, as well as the occurrence of malfunctions are caused by the present constructive innovative solution minimized. Also very advantageous is the time savings to be achieved in the application according to the invention of the tool. For example, a time saving of one minute and 50 seconds per three train to install compared to conventional known filling and / or circulating devices are achieved.

Particularly advantageous is the use of an external compressed air source for reliable operation of the filling piston 9 ,

Here, not only is the back pressure of the drilling fluid closing the drill string through the piston valve 4 used, but in addition a strong pneumatic pressure force in the cylindrical cavity of the piston chamber 5 is produced.

According to the invention so and the filling new drill trains with drilling fluid already during their coupling to the drill string and during their installation time.

1

cylindrical body

2

End piece of the main body with screw

3

fill opening

4

piston valve

5

piston chamber

6

inlet-side Valve disc of the piston valve

7

outlet side Valve plug of the piston valve

8th

Valve guide rod

9

hollow cylindrical filling piston

10

connection valve for printing medium

11

Valve return spring

12

annular stop with groove of the filling piston

13

sealant the filling piston guide

14

Stop / valve seat

15

Füllkolbenführung

16

Media Connection

Claims (5)

Filling device for filling a deep hole strand or one or more drill trains with drilling fluid, consisting of a cylindrical body ( 1 ), which has a piston chamber ( 5 ) with at least one closable filling opening ( 3 ) for drilling fluid and an end piece ( 2 ), which has a screw connection, which serves for coupling to the top drive drive of the deep drill string, characterized in that a hollow cylindrical filling piston ( 9 ) for dispensing drilling fluid into the drill string in the piston chamber ( 5 ) of the cylindrical base body ( 1 ) is slidably disposed axially movable and into the cavity of the filling piston ( 9 ) engaging piston valve ( 4 ), which is also axially movable in the piston chamber ( 5 ) is arranged. wherein an opening position by pressurization with drilling fluid and a closed position by pressurization by supplying external media is ingestible., Filling device according to claim 1, characterized in that the basic body ( 1 ) a connection valve ( 10 ) for supplying or relaxing liquid or gaseous media in the cylindrical interior between the base body ( 1 ) and filling piston ( 9 ) of the piston chamber ( 5 ), whereby a pressurized movement of the filling piston ( 9 ) is to effect between an open and closed position. Filling device according to claim 1 or 2, characterized in that the basic body ( 1 ), as well as the filling piston ( 9 ) Slings ( 14 . 15 ), which as an inlet-side valve seat ( 14 ) and as an outlet-side filling piston guide ( 15 ) are formed, with whose arrangement the Füllkolbenhub between the open position and the closed position of the filling piston ( 9 ) in the main body ( 1 ) is fixable, wherein the filling piston guide ( 15 ) Sealant ( 13 ), which complete the arrangement liquid and gas-tight. Filling device according to claim 3, characterized in that the piston valve ( 4 ) a valve guide rod ( 8th ) with a valve disc ( 6 ) and at a defined distance at least one valve plug ( 7 ) which is designed such that it in the hollow cylindrical interior of the filling piston ( 9 ) is liquid-tight, whereby its closure is made possible, and an inlet side valve return spring ( 11 ) above the stop / valve seat ( 14 ) is arranged such that by the spring force of the inlet-side valve disc ( 6 ) against the valve seat ( 14 ) is closable. Filling device according to claim 4, characterized in that the filling piston ( 9 ) on the inlet side with a ring stop ( 12 ), which has at least one circumferential groove for receiving a sealing ring, the volume of the pressure medium from the into the piston chamber ( 5 ) separating drilling fluid, wherein in the filling piston ( 9 ) insertable valve plugs ( 7 ) is also provided in its circumference with at least one sealant, whereby the closure of the filling piston is made possible with respect to the drill string or Bohrzug.