NO860220L - LIFTING MACHINE FOR USING DURING OIL AND GAS. - Google Patents

Description

Oil and gas burner drilling requires hoisting equipment to lift o; :' and put down the drill string. Furthermore, during the drilling itself, it is necessary to regulate the pressure against the drill bit by holding back the drill string. I'!, f "yielding drill;, latforms m;; the hoisting mechanisms also con; ensore for movement toe due to bellows.

Today's conventional equipment essentially consists of hoist soil (Drao/u/ork) with wire drum and u/ire over a block at the top;..one of the derrick and in the hoist hook where grease is arranged for the drill pipe. This main principle has worked satisfactorily until now, but with today's requirements for increased operational reliability and accurate management and measurement of data for raw drill string and drill bit stresses, there is a great desire in the professional community to come up with a hoisting system that is more control-friendly and where the position of the hoisting machine can be determined at any time define and manage modern control technology that can use programmable computers for monitoring the drilling process.

In order to meet these wishes, a hoisting machine construction has been arrived at, as will be apparent from the present patent application, in which rack rails of known design are used, but where the hoisting machine's design and structure itself constitute what represents substantially new principles in relation to known technology.

The present patent is assumed to be used in connection

with drill tower construction as described in patent application no. B40435.

The hoisting machine is shown in the attached figures no. 1-4,

where Figure 1 shows the hoisting machine seen from the front, from above and in section. Fig. 2 shows the drilling structure for gears with gears and guide rollers

Fig. 3 shows the attachment of gears to gears.

Fig 4 shows the device for securing the hoisting machine in case of possible extreme bias loads.

The hoisting machine which is supposed to run on four vertical rack rails (9) mounted with bolts (19) to a sub-structure (10) which in turn is attached to the main structure for the derrick. See patent application no. 840435.

The rack rails (9) are mounted with the tooth profiles as follows

that these face each other.

In order to satisfy the functional requirement that the hoisting machine must be able to accommodate subsequent deformations in rack rails and derricks, the hoisting machine is built with two independent drilling structures (3) to which guide rollers (8) are mounted.

which follow the rack rails (9). To the supporting structure (3)

a secondary support structure (2) is attached where gears (6) and gears (5) and hydraulic drive motors (7) are connected to the gears.

To facilitate assembly and disassembly of the gear (6) and drive wheel (5), the secondary structure (2) is attached to the primary part (3) with adjustment screws (11). Furthermore, there are rubber pads (12) arranged in the direction of power transmission, which are intended to dampen the jockey of the load. The screw connection (11) is also used for setting the correct tooth engagement on the drive wheels (5). The guide rollers (14) ensure correct positioning between the gears (5) and the rack rails (9). The gears (5) with associated gears (6) and hydraulic motors (7) are mounted in pairs, two and two against each other, thereby counteracting biasing forces from the tooth's movement between wheel (5) and rail (9).

The two independently controlled support structures (3) with associated guide rollers (8) are connected through the cross yoke (1) which is firmly connected to one of the support structures (3) through the bolt connections (15) and (16) and a joint connection (17) thereby can the two support structures (3) on each side are moved by each other and consequently conform to deformations in the tooth structure and rails.

The drilling machine (23) which rotates the drill string and is connected to it during drilling and hoisting of the drill string is of a known design and is assumed to be attached to a frame (21)

which is in turn attached to a main frame (4) through the suspension struts (24) and (25) and the bolt fasteners (20).

By placing a hydraulic cylinder (26) attached to the frame (21) and the support structure (4), the drilling machine (23) can be moved parallel to a side position as indicated by the dashed line in Figure 1. This function is necessary when the drilling machine (23) is to be driven down the side of the drill string.

The bare structure (4) is guided by guide rollers (18) against the rack rails (9). The vertical forces from the drilling machine are transferred from the drilling structure (4) to the hydraulic cylinders (22) through the bolt connection (27). The hydraulic cylinders (22) provide for the release of wave motion between the drilling platform and the drill string. On drilling installations on land or offshore platforms fixed to the seabed, the cylinders (22) are replaced with fixed steel rods. The torque from the leore machine (23)

taken up by the hydraulic cylinders (26) through the support frame (21)

Figure 3 shows a detail of the attachment for the drive gear (5) to the main gear (6). In order to achieve the usual frictional pressure between the gear wheel and the rack rail and thereby ensure correct tooth engagement and increased service life of the components, the gear wheel (5) is attached by means of a -Swedish bearing (36) and (34)

Claims (2)

1. Hoisting machine with wave compensator for use when drilling oil and gas wells from floating and fixed platforms where the hoisting machine is mainly designed to hoist the drill string with associated drilling machine and equipment. Characterized by the hoisting machine being mounted to four vertical rack rails (9) through the support structures (3) which are equipped with guide rollers (8) and connected to a secondary support structure (2) with a rubber elastic connection (12) which transfers the forces from the support structure ( 3) to the secondary structure (2) which carries the gears (6) and gears (5) with Swedish bearing (34) (36) and arc tooth coupling (37) for transferring the forces to the rack rails (9). Furthermore, that the support structures (3) are mutually connected to each other through the "yoke" (1) which is attached to the support structure (3) with the link connection (17) and the bolt connections (15) and (16) where the connection (16) is designed to break large bias loads and thereby activates the valve (41) which releases and activates the brake lamellas (46) (47) which lock the lift's movements. 2. The hoisting machine as described in claim 1 with the addition of a device for compensating wave movements on floating platforms Characterized in that hydraulic cylinders (22) are attached to the "yoke" (1) which are connected to a carriage (4) through the bolted connection ( 27) so that the carriage (4) can be moved independently of the hoisting machine and where the carriage (4) is fitted with an attachment for the drilling machine (23) through the links (24) and (25) and hydr. the cylinder (26) so that the drilling machine can be moved parallel to a parking position outside the drilling center itself.