JPH03502351A - Device for expanding tubes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Device for expanding tubes Technical field FIELD OF THE INVENTION The present invention relates to well drilling technology, and more particularly to a device for expanding pipes.

The present invention expands the tubing used to join difficult areas in drilling operations. It can be used to cover difficult areas such as borehole mud or cement. Severe loss of slurry, liquid or gas from exposed composition into wellbore Associated with inflows or depressions in the rock being excavated.

Background technology Today, when drilling deep wells for oil or gas production, from a drilling perspective uninviting compositions, such as compositions with unusually high and low composition pressures, and Encounter compositions that show a tendency for rocks to fracture or cave in into boreholes It's not uncommon.

Implementations used to date include adding an intermediate or shortened casing into the well. The goal was to isolate such compositions by passing them through a gas string.

However, the second implementation requires the string to be tightly tied to the well and additional Significant material inputs and costs imposed by the need for additional metals, bonding agents, and operating time. accompanied by business.

Additionally, once any additional casing string is installed, the diameter of the well smaller, thus adversely affecting production conditions.

Now, for further subsequent drilling without reducing the given diameter of the well, the The part of the well that is in the area of difficult composition has a batcher installed there; For example, it can be used to expand a well by concentrating fluid pressure inside a series of tubing. It takes the form of a series of tubes that are biased into engagement with the wall of the stomach, followed by gastric dilatation. A tensioning device is used to calibrate the inner passage of the tubing for a given wall diameter.

a tapered guide member having a slot for receiving an expansion member in the form of a cylindrical roller; Device for expanding the casing (USSR, Inventor's Certificate No. 371340) is known. The slot is on the axis of the housing. the slot extends at an angle to the device, with the lowermost portion of the slot It is shifted from the uppermost part in the direction of rotation.

This well-known device consists of a drill tube that is placed facing the fractured part of the casing string. The string is passed over the well and then rotated under a preset load. The rollers engage and displace the broken portion of the casing string.

A drawback of this known device is that its performance is insufficiently reliable. because, The roller received in the slot of the tapered guide member of the housing is inserted into the slot. The rollers are at risk of suspended hard particles in the milk collection fluid from getting into the becomes immobile, and some of such particles act as abrasive, so , because the rollers wear out quickly.

Another drawback of that known device is that the slot in the tapered guide member of the housing The large frictional force exerted by the inner rollers means that the expansion speed is relatively low. That is.

In addition, equipment for expanding the well casing as it is fractured in the well. is known (USSR, inventor's certificate no. 467994), and this device with a housing in the form of a direct tapered guide integrated with a tapered guide. However, the guide member is installed at an angle to the geometric longitudinal axis of the housing. A slot for receiving an expansion member in the form of a tapered roller using a bearing means. and the guide member has a larger end facing the center of the housing.

The last-mentioned device operates similarly to the previously mentioned devices.

The main drawback of this device is the insufficient strength of the bearing means of its rollers, so Applying a sufficiently heavy load to the equipment, such as that required to expand the tubing. This has a detrimental effect on the expansion efficiency of this type of tube.

Another drawback of this last-mentioned well-known device is that suspended particle cavities in the exploration fluid Then, some of the abrasive material gets into the slot and the roller slides into the slot. Due to the danger of suspended particles that can get stuck in the The reliability of performance is insufficient.

Yet another drawback of the known device is that, in particular, the rollers are At the moment when it gets stuck and stops moving, the roller in the slot of the tapered guide member catches it. Due to the large frictional force, its efficiency is relatively low.

Also, the angle between the housing and the longitudinal geometrical axis of this housing is and an expansion member mounted on a bearing in the axial neck. Another device (USSR, inventor's certificate no. 394133) is known.

However, this prior art device has a complex structure and the frictional forces in the working area has insufficient efficiency due to its large size, so that the force transmitted from the expansion member to the tube is Because it is lowered, this prior art device is only suitable for expanding the ends of tubing. do not have.

The aim of the invention is to increase the reliability of the performance of a device for dilating vessels.

Another object of the invention is to extend the useful life of the device for dilating vessels. It is.

Yet another object of the present invention is to speed up the process of expanding tubing.

The main object of the present invention is that the design of the expansion member reduces friction in the area where the expansion member engages the tube. Expanding the tube significantly reduces the force and at the same time increases the force transmitted to the tube The goal is to create a device that makes the system expand.

Disclosure of invention To achieve this purpose, it is provided with a housing, which in its longitudinal direction Expanding a tube with an expansion member mounted in a bearing on the axial neck at an angle to the axis In the device according to the invention, the expansion member is shaped as a spherical part; The outer surface of this spherical part belongs to alternating parts of the sphere and to a plane perpendicular to the axial neck axis. It may be defined by a side surface of a cylinder having a geometrical axis.

The disclosed streamlined shape of the working surface of the expansion member allows the device according to the invention to Significantly reduces friction in the area of engagement between the expanded tube and the expansion member, and also transfers friction to this tube. considerably increases the force applied, thereby substantially increasing the properties of the dilatory action and improving its Increase speed.

Brief description of the drawing Other objects and advantages of the invention will be found in the following description of the preferred embodiments of the invention, with reference to the accompanying drawings: This will be made clear by the description. In the figure, Figure 1 shows the expansion of the pipe in the well. FIG. 2 is a schematic diagram of a device embodying the invention in operation to The device of FIG. 1 is shown in cross-section, and FIG. 3 is taken along arrow A in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. FIG. 3 is a sectional view taken along line V-V in FIG. 2;

BEST MODE FOR CARRYING OUT THE INVENTION A device for dilating a tube, embodying the invention, has a shaft neck 2 (FIG. 2). It includes a housing 1 (Fig. 1), and an expansion member 3 is rotatably attached to the shaft neck 2. ing.

The axial neck 2 extends at an acute angle to the longitudinal geometrical axis of the housing 1 and is enlarged. The tension member 3 is attached to the shaft neck 2 by ball bearings 4 and 5. Shaft with lubricating grease For filling the receivers 4 and 5, the expansion member has an opening 6 that can be closed with a screw 7.

The sealing element 8 seals the area of engagement between the shaft R2 and the expansion member 3.

The expansion member 3 is shaped as a spherical section 9, the outer working surface of which is formed by alternating sections of the spherical surface. 10 (see Fig. 1 and Fig. 3) and the side surface of the cylinder 11, respectively. The geometrical axis 12 of this is a plane perpendicular to the longitudinal geometrical axis 13 of the shaft neck 2. (belonging to Contains the center "0" of the sphere. A common point 14 (No. 1) where the side surfaces of each cylinder 11 intersect 3) is at the apex of the expansion member 3.

The expansion member 3 can be of several modified variants (not shown), e.g. in a plane in which the axis 12 is perpendicular to the axis 13 of the expansion member 3 (i.e. of its axial neck 2); offset from this axis 13, otherwise the plane containing the axis 12 would be the expansion member 3 is shifted below the center "0", otherwise the cylindrical surface 11 is rotationally concave (hyperbola) Substituted by surface.

The device is operated as follows. Pass the tubing 15 through the probe hole or otherwise Casing strings 16 (as shown in Figure 1) are used to join difficult areas. ), and the tube 15 is straightened from the inside by excess fluid pressure. Even if the pipes are not straight, corrugations 17 (Fig. 4) are still left on their outer circumferences. There is. The disclosed device screws onto the drill string 18 (FIGS. 1 and 2). casing string 16. be passed to. Due to the streamlined shape of its working surface, the expansion member fits into the inner space of the tube 15. and apply fluid pressure to the corrugated section 17 while rotating the drill tube string 18. Straighten the corrugated portion 17 that is not straightened, and at the same time straighten the entire inner surface of the tube 15. calibrate and connect the tubing to the borehole wall or casing connection as shown in Figure 5. Biased into tight engagement with the walls of chain 16.

Industrial applicability The invention can be used for joining difficult areas as well as in repairing damaged pipes. It can be used to expand the tubing used.

F wide 2 II, 7 international search report 111-1---1m PCT/! ;U　8B100238

Claims (1)

[Claims] A housing (1) is provided, the housing being at an angle to its longitudinal axis. The tube has an expansion member (3) mounted with bearings (4, 5) on the bearing (2). In the device for expansion, the expansion member (3) is shaped as a spherical part (9). , the outer surface of this spherical part is aligned with alternating parts of the spherical surface (10) and the axis (1) of the bearing (2). 3) of a cylinder (11) with a geometrical axis (12) belonging to a plane perpendicular to A device characterized in that it is partitioned by a side surface.