RU2237796C1 - Method for reinforcing well shaft and device for realization of said method - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: method includes lowering and mounting of profiled pipe in area of complication, which pipe is provided with two bushings connected to its ends. Inner pressure is formed on pipe walls. Pipe diameter is increased until contact is reached with well walls. Pipe is fixed in the well. Into complication area a pipe is mounted, which is made of fusible material and filled with water. The latter is heated by heat generator up to temperature when pipe material softens and pipe diameter increases to contact well walls. After that heat generator is disabled and bushing in contact with it is melted down by electric heating means and heat generator is removed from the pipe as well as electric heating means. Device has profiled pipe equipped with two thick bushings rigidly connected to its ends and mounted on hoisting means. Device is provided with weighting material connected to cable lock and electric heating means mounted below it, placed in upper end bushing, and heat generator, placed in pipe hollow and connected to electric heating means with possible removal of these from the pipe. The latter is made of fusible material and filled with liquid. Bushings are made of the same material as the pipe.

EFFECT: simplified and cheaper technology for reinforcing separate portions of tectonic disruptions, isolating absorption zones and fluid influxes.

2 cl, 3 dwg

Description

The invention relates to the mining industry and can be used to fix unstable and isolate the absorbing intervals of rocks during the construction of exploration, production, hydrogeological, engineering wells for various purposes using relatively low-melting environmentally friendly materials.

A known method of isolating water inflows (see A.S. of the Russian Federation No. 697690, M.cl. E 21 B 33/138, 79), which consists in supplying the bottom hole to the isolated zone of the fusible thermoplastic material and its subsequent distribution by dry drilling . With this method, the effect of the transition of mechanical work into thermal energy is used. To implement the method requires thermoplastic materials with a low melting point (resins, bitumen, plastics). This method is intended to fix the wellbore only in the bottomhole zone and does not provide for the fastening of individual sections of tectonic disturbances, fracturing, isolation of absorption zones and fluid manifestations at any interval of a pre-drilled deep well.

A known method of electrothermal fastening of a wellbore and a device for its implementation (see RF Patent No. 2057901, Mcl 6 E 21 B 33/138. The method of electrothermal fastening of a wellbore is based on the melting of low-melting environmentally friendly grouting materials, preparing a composite grouting material with with a melting point of 50-1000 ° C, the plugging penetrator is lowered into the pre-drilled well, after which the well is filled with cement material to the desired height, and then the heated plugging penetrator is raised torus to the wellhead.

A device for implementing the method includes: a plugging thermal penetrator, an electric power source, a winch, a block balance, a cable-cable for suspending the penetrator and sewer electricity to the plugging penetrator, a rod with centralizers and a cable lock. In this case, the mold-cylindrical shaper is placed in the lower part of the penetrator body, a rod with centralizers is placed between the penetrator body and the cable-rope, and the penetrator body in the upper part has a conical shape with the possibility of providing an angle of 5-10 ° with the borehole walls, while the outer the penetrator body diameter is 10-30% less than the well diameter.

This method and device provide for fixing only dry and shallow wellbores, while the delivery of low-melting grouting materials to the attachment point of individual sections of tectonic disturbances, fractures, isolation of absorption zones at any interval of a deep well filled with mud is impossible.

A known method of electrothermal fastening of a wellbore and a device for its implementation (see RF Patent No. 2158347, Mcl 7 E 21 B 33/13), which is also based on the melting of low-melting environmentally friendly grouting materials, the well attachment zone is additionally filled with an inert filler , for example, with granite crumb, and when the heated heat generator rises to the wellhead, the central part of the well zone is simultaneously filled with fusible binder material, the borehole with an inert filler, and Your electrothermal fastening of the wellbore is equipped with two tanks, rigidly mounted one above the other on a rod suspended on a load-carrying cable, and a cone-shaped heat insulator fixed between the lower tank and the heat generator, the lower tank being filled with fusible granular binder material, and the upper one with an inert filler - granite chips, while in the bottoms of both tanks removable fusible plates and ring heaters are installed, and at the end of the heat generator is fixed sealant.

This method and device provide for the attachment of wellbores, but require a significant investment of time in preparing an electrothermal projectile associated with loading containers with inert and low-melting materials. A device for blocking the complication zone in a well is known, RF patent No. 1712581, M.C. E 21 B 29/10, 33/13. A method of attaching a wellbore consists in lowering a profile pipe on a string of drill pipes into a well, injecting fluid under it under pressure, pushing the pipe into the walls of the well and loosing the threaded joints of the profile pipe. The device includes a profile pipe with cylindrical sections at the ends, on the lower of which there is a shoe with a check valve, and in the upper - an expander with an anchor element, rigidly connected to the mandrel head located above the profile pipe and having a connection unit for drill pipes, while cylindrical sections of the profile pipe are made of outer annular grooves for sealing elements and corresponding inner grooves of the annular protrusions, while the anchor element in the form of an outer protrusion on the extension Itel, and the cylindrical section of the profile pipe under the inner annular protrusion has an annular groove for accommodating the protrusion of the expander in its original position. The device is lowered into the well on a drill pipe string and installed in the complication zone. Profile pipes are straightened by internal pressure by injecting fluids into them and thereby fix them to the walls of the borehole, and then threaded joints of profile pipes are expanded by an expander.

This method and device is complex in operations and design, containing a large number of assembly units and expensive in its manufacture and requires significant labor costs for tripping operations when using drill pipes. There is a known method of attaching a wellbore patent No. 20046569, adopted as a prototype, comprising a housing made in the form of a corrugated shutter from a segment of a thin-walled metal pipe equipped with spikes-crutches outside, a housing suspension made in the form of a wireline cable, while the ends of the housing are muffled by caps. Inside the housing there is a charge with an igniter. When placing the device in the zone of attachment of the borehole produce an explosion. As a result of the explosion, the lower cap of the overlap collapses, and the upper cap with the igniter is removed and removed from the well on the wireline, and the casing (corrugated overlap) is deformed and its corrugated wall is smoothed, tightly pressed to the surface of the well and covers existing cavities and cracks.

This method can be used only with insignificant caverns and cracks, while attaching zones of complications of significant volumes during a blast of a charge, destruction of the wireline, destruction of a thin-walled profile pipe with significant additional destruction of the zone of complication and clogging of the bottom of the well with device parts can be observed.

The technical result of the invention is the elimination of these drawbacks, namely, the consolidation of individual sections of tectonic disturbances, isolation of absorption zones and fluid manifestations at any intervals of wells for various purposes through the use of simpler and cheaper device technology.

The technical result in terms of the method is achieved by the fact that in the method of fastening the wellbore, including the descent and installation in the complication zone of a profile pipe equipped with two bushings connected to its ends, creating internal pressure on the pipe walls, increasing the diameter of the pipe to contact with the walls of the well and fixing it in a well, according to the invention, a pipe made of fusible material and filled with water is installed in the complication zone, the latter is heated by a heat generator to a softening temperature of the material of the pipe and increasing the diameter of the pipe until it contacts the walls of the well, then the heat generator is turned off and the contact sleeve is melted with the electric heater and the heat generator and electric heater are removed from the pipe.

The technical result in terms of the device is ensured by the fact that the device for attaching the wellbore contains a profile pipe equipped with two thickened bushings rigidly connected to its ends and mounted on a lifting device, according to the invention, the device is equipped with a weighting device connected to a cable lock and installed under it an electric heater, located in the upper end sleeve, and a heat generator located in the cavity of the pipe and connected to the electric heater with the possibility of their treatment of the tube, which is made of a fusible material and is filled with fluid, and the sleeve made of the same material as the tube.

The method and device are illustrated by drawings, where in Fig.1 shows a device for attaching a wellbore, in Fig.2. shows a general diagram of the device, figure 3 shows a section of a pipe.

The device comprises a low-melting profile environmentally friendly pipe 1, made, for example, of polypropylene, the end parts of which are rigidly connected to the thickened cylindrical bushings of the lower 2 and upper 3. The heat generator 4, located in the cavity of the pipe 1, filled with water 5, is connected to the environmentally friendly upper part of the profile pipe 1 through an electric heater 6 and a sleeve 3. The device also includes a cable lock 7, a weighting agent 8, a load-carrying cable 9 for electricity drainage, a winch 10, an electric power source 11 and itself Khodnev rig 12.

The device operates as follows. After assembling the device, which includes a heat generator 4, a profile low-melting environmentally friendly pipe 1 with bushings 2 and 3, made of the same material as pipe 1 filled with water 5. An electric heater 6 is mounted in the upper end bush 3. Cable lock 7 and a weighting agent 8 is located above the electric heater 6. The device is suspended on a load-carrying cable 9 and installed in the well with a winch 10 in the complication zone. The thickening of the sleeves 2 and 3 serves to increase the mechanical strength during heating and creating fluid pressure in the pipe cavity 1. After installing the device in the zone of complication of the interval of the well, the heat generator 4 heats the water 5 to the softening temperature of the pipe walls 1 and due to the pressure formed in the pipe cavity when phase transition of water into steam increase the diameter of the pipe 1 to contact with the walls of the well, then turn off the heat generator 4 and turn on the electric heater 6, mounted in the sleeve 3 of the pipe 1, which when heated melts the contact sleeve 3 with it and is freed from the pipe 1. After that, the heat generator 4 with a heater 6, a cable lock 7 and a weighting agent 8, mounted on a load-carrying cable 9 using a winch 10, is raised to the surface, and the pipe 1, which has changed its shape, remains in the zone of complication of the well interval. Subsequent drilling of the well bore 2 and 3 are drilled.

The studies showed that at the present stage, the proposed method and device can find economically feasible practical application for the environmentally friendly fastening of individual zones of tectonic disturbances and isolation of absorbing and developing horizons and repair of casing strings at any intervals of deep wells filled with drilling mud.

The high speed and reliability of fixing the walls of the well with relatively low-melting profile pipes significantly reduces material costs and the cost of constructing wells, excluding the use of steel casing. The fastening of individual intervals of the wells will reduce the carrying capacity and power of drilling rigs, the cost of casing and cemented work, transport and energy.

Claims (2)

1. The method of attaching a wellbore, including the descent and installation in the complication zone of a profile pipe equipped with two bushings connected to its ends, creating internal pressure on the pipe walls, increasing the diameter of the pipe to contact with the walls of the well and fixing it in the well, characterized in that a pipe made of fusible material and filled with water is installed in the complication zone, the latter is heated by a heat generator to the softening temperature of the pipe material and the pipe diameter increases until it contacts holes of the well, after which the heat generator is turned off and the contact sleeve with it is melted by the electric heater and the heat generator and electric heater are removed from the pipe. 2. A device for mounting a wellbore, comprising a profile pipe, equipped with two thickened bushings, rigidly connected to its ends and mounted on a lifting device, characterized in that the device is equipped with a weighting device connected to a cable lock and installed underneath an electric heater located in the upper end sleeve, and a heat generator located in the cavity of the pipe and connected to an electric heater with the possibility of their extraction from the pipe, which is made of fusible material la and is filled with liquid, and the bushings are made of the same material as the pipe.

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