RU2449113C2 - Method of entering productive formations from wells and device for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used at entering the productive formations from wells reinforced by well tubing that are and were in operation. Method includes drilling of perforating channels in the wall of well tubing and annular space with the aid of a bore that is delivered to well tubing wall by bore supply unit through surface pipe. Bore build up is done after each deepening by the length of its rod that is automatically supplied from the loader by rod of the same length. Disconnection of bore supply unit from the composite rod left in perforated channel is done after reaching the specified depth of the channel. In the course of perforating channel formation the bore and composite rod are kept from moving in transverse direction inside the surface pipe rotating together with the bore and composite rod. The surface pipe and composite rod inside the surface pipe are fixed to prevent rotation in the moment of bore build up.

EFFECT: increase of reliability of productive formation entering irrespectively of getting into drilling zone of previously created channels, also presence of cavities and less dense areas in annular space.

6 cl, 6 dwg

Description

The invention relates to the oil and gas industry and will find application in the opening of productive formations from wells reinforced with casing pipes that are and were in operation.

A known method of the secondary opening of the reservoir using a perforator drilling action, in which as a cutting element using a drill and a node that controls the magnitude of the current load during drilling [1]. If the current load deviates during the drilling process from the program one, due to the drill getting into the zone of the previously perforated hole, the perforation of the well is stopped, by raising (lowering) the perforator, a new position is found at which the current load value corresponds to the program load, after which the perforation process is carried out until its completion .

The disadvantage of this method is the possibility of displacement of the drill in the transverse direction, which leads to the need for constant monitoring of the punching process, forced stops and movement of the punch in the well during punching and a small (less than the casing radius) perforation depth.

A known method of the secondary opening of the reservoir using a perforating drill [2]. The method includes sinking by drilling perforation channels to a depth of ≤3 m using a perforator equipped with a sinking mechanism with a cutting element - a drill. At the same time, after each deepening by a drill to the length of its shaft to the same length, it is increased by an automatically supplied shaft from the cartridge to the drill feed mechanism and after reaching the perforation channel of the design depth, the drill feed mechanism is disconnected from the resulting composite drill rod left with its cutting element in the drilled channel.

The disadvantage of this method is the low reliability of perforation in wells that are and were put into operation, due to the fact that when the cutting element of the drill enters the zone of the previously perforated hole in the casing or cavity in the annulus, it deviates from the drilling direction with subsequent breakage of the drill.

A known method of the secondary opening of the reservoir using a perforating drill [3]. This method is by technical nature closer to the proposed one and can be applied as a prototype.

The method includes drilling perforation channels in the wall of the casing and the annulus using a drill, which is fed to the wall of the casing through the drill feed assembly through the conductor, building up the drill after each recess to the length of its shaft with a rod of the same length automatically supplied from the cartridge, disconnecting the feed assembly drill from the resulting composite rod, left in the drilled channel after reaching the perforation channel of the design depth. In this case, first, the guide elements of the drill are pulled out through the conductor of the feed unit, and then, as the casing is drilled, the guide elements are simultaneously found in the conductor of the feed unit and the channel formed after drilling, which is used as the conductor for the drill, after the guide elements of the drill exit the assembly conductor filing.

The disadvantage of this method is the presence of stable drilling only during the passage of the drill through the wall of the casing, including the zone of the "old" (previously created) channels, as well as in the absence in the cement insulating layer directly behind the wall of the casing of the caverns, the depth of which exceeds the size of the drill casing string at the moment of joining the next following rod to the drill, and in the absence of less dense areas in the annulus (see Fig. 2, 3). Since in this case the conductor is kept from moving in the transverse direction only at the section where the guiding elements of the drill pass through the conductor and is not carried out when the drill rod and feed rods pass through the conductor, the further process of building up the composite rod is carried out in the absence of restrictions on its movement in a plane perpendicular drilling axis, which reduces the reliability of the process of building a composite rod. In addition, in the presence of caverns, the depth of which exceeds the value of the drill exit beyond the casing, and in the presence of less dense areas in the annulus, reliable drill growth is not ensured due to the lack of stop and, therefore, inhibition of the drill from turning at the time of screwing from the cartridge a rod with a drill and another rod with a previously formed composite rod.

In addition, in the prototype, in the presence of the above factors (caverns, less dense areas), the alignment of the rods supplied from the cassette to the conductor and the spindle of the drill feed assembly is not sufficient to ensure reliable drill growth.

The objective of the present invention is to increase the reliability of the method of opening productive strata of wells regardless of the penetration of previously created channels into the drilling zone, as well as the presence of caverns and less dense areas in the annulus.

The essence of the invention lies in the fact that in the method of opening productive formations from wells, including drilling perforation channels in the casing wall and the annulus using a drill, which is fed to the wall of the casing through the drill feed unit through the conductor, building up the drill after each recess in length its rod, a rod of the same length automatically supplied from the cartridge, disconnecting the feed unit from the resulting composite rod, which is left in the perforated channel after reaching the passage through tnoj depth, the drill is held and a composite rod from moving laterally within the rotating together with the drill rod and the composite conductor throughout the process of formation of the perforation tunnel. In addition, the conductor itself and the composite rod, together with the drill inside the conductor, are fixed from turning at the time of the build-up of the drill.

Additionally, the rods supplied from the cassette are aligned with the conductor and the spindle of the drill feed unit in an emphasis, which is a continuation of the conductor body.

In a device for implementing the method, including a drilling punch containing an electronic unit, an electric drive, a fixation unit for a punch, a drill, a drill feed unit, a conductor and a cassette with integrated cassettes containing rods, a conductor placed inside the conductor body and rotating together with the drill and a composite rod , made with an inner diameter equal to the diameter of the drill rod and stackable rods supplied from the cartridge. The conductor itself is equipped with fixation units for turning the conductor inside the conductor and drill body with the rods supplied from the cassette inside the conductor at the time of the build-up of the drill.

The fixation nodes from turning the conductor inside the conductor and drill housing with the feed rods inside the conductor at the time of the drill extension can be made in the form of spring-loaded balls recessed into the conductor body from its inner and outer sides, while in the drill body, the supplied rods and the conductor case recesses corresponding to the spatial arrangement of the balls are performed.

The fixation unit from turning the conductor inside the conductor body can be made in the form of spring-loaded balls recessed into the body of the conductor body, and in the outer side of the conductor body, recesses corresponding to the spatial arrangement of the balls are made.

The casing of the conductor can be additionally equipped with a box stop coaxial to the conductor, whose inner planes are parallel to the axes of the conductor and the spindle of the drill feed unit.

Due to the fact that the build-up of the drill and the retention of the composite rod from moving in the transverse direction is carried out inside the conductor throughout the process of forming the perforation channel, the direction of drilling is maintained when the drill enters the zone of previously created perforation channels in the casing, as well as caverns and less dense areas in the annulus and thereby eliminates a break in both the drill itself and the expandable rod.

The fixation nodes from turning the conductor inside the conductor and drill housing with the feed rods inside the conductor at the time of the drill extension ensure reliable screwing of all elements of the composite rod in the absence of emphasis and, therefore, braking of the drill from turning at the moment of screwing the rod supplied from the cartridge with the drill and the next rod with an already formed compound rod.

The presence of a box stop coaxial with the conductor, which is an integral part of the conductor body, with inner planes parallel to the axes of the conductor and the spindle of the drill feed unit, further increases the reliability of the drill build-up at the moments of screwing of the cores with the drill and the previously formed composite rod supplied from the cassette due to more accurate orientation and exclusion deviations of the axis of the rod fed from the cassette from the axis of the conductor in two transverse directions.

In the accompanying drawings shows a device for implementing the method: figure 1 shows a General view of the device; figure 2 - the moment of the position of the drill in the conductor of the drilling unit at the beginning of drilling holes in the casing; figure 3 - the moment of the beginning of the attachment of the rod to the drill in the conductor; in Fig.4 - the moment of fixation from turning the conductor and the drill with the rods supplied from the cassette at the time of the drill; figure 5 - the moment of the position supplied from the cassette of the rod in the box emphasis.

A device for opening productive formations from a well includes a logging cable 1, a perforator 2 containing an electronic unit 3, an electric actuator 4, a perforator fixation unit 5, a drill 6, a drill feed unit 7, a conductor 8, a cassette 9 with integrated cassettes 10 containing rods 11. The inner diameter of the conductor 8, placed inside the casing 12 of the conductor and rotating together with the drill 6 and the composite rod, is made equal to the diameter of the shaft of the drill 6 and the feed rods 11 (see figure 2, 3). The conductor is equipped with fixation units 13 and 14 (see FIG. 4) from turning the conductor 8 inside the conductor body 12 and the drill 6 with the rods 11 supplied from the cassette 10 inside the conductor 8 at the time the drill is being built up.

The nodes 13 and 14 of fixing from the rotation of the conductor 8 inside the casing 12 of the conductor and the drill 6 with the supplied rods 11 inside the conductor 8 at the time of growing drill can be made in the form of spring-loaded balls 15, recessed into the body of the conductor 8 from its inner and outer sides, and the body of the drill 6, the supplied rods 11 and the casing 12 of the conductor when this is performed corresponding to the spatial arrangement of the balls 15 of the recess 16 (see figa).

The node 14 for fixing from turning the conductor 8 inside the conductor body 12 can also be made in the form of spring-loaded balls 15 recessed into the body of the conductor body 12, and the recesses 16 corresponding to the spatial arrangement of the balls 15 are made on the outside of the conductor body 8 (see Fig. 4b) .

The casing 12 of the conductor can be additionally equipped with a box stop 17 coaxial to the conductor, the inner planes of which are parallel to the axes of the conductor 8 and spindle 18 of the drill feed unit 7 (see FIG. 5).

The proposed method is as follows.

On the logging cable 1, the perforator 2 is lowered into the well to a predetermined depth. Supply voltage is supplied to the electronic unit 3 and the electric drive 4, ensuring the fixation of the punch 2 in the casing 19 using the node 5 for fixing the punch and the inclusion of the mode of perforation (drilling) of the casing 19 and the annulus. The drill 6 is fed to the wall of the casing 19 for drilling it using the drill feed assembly 7 through the conductor 8. After each deepening with the drill 6, the rod 11 is automatically fed from the cassette 10 to the length of its rod 10, which is connected (screwed) in the conductor 8 with the composite drill rod 6, by increasing the length of the composite rod of the drill 6. At the same time, the drill 6 is increased and the composite rod is kept from moving in the transverse direction inside the conductor 8 rotating together with the drill 6 and the composite rod 8 throughout the formation process perforation channel. The conductor 8 itself and the drill 6 with the rods 11 supplied from the cassette 10 inside the conductor 8 are fixed by means of fixation units 13 and 14 from turning while the drill 6 is being built up.

Additionally, the rods 11 supplied from the cartridge 10 are aligned with the conductor 8 and the spindle 18 of the drill feed unit 7 and are oriented in a stop 17, which is a continuation of the conductor body 12.

Thus, the direction of drilling is preserved when the drill enters the zone of previously created perforation channels in the casing, as well as caverns and less dense areas in the annulus and the kink of both the drill itself and the build-up core is excluded. Reliable screwing of all elements of the composite rod is also ensured in the absence of emphasis and, therefore, braking of the drill from turning at the time of screwing of the rod supplied from the cartridge with the drill and the next rod with the previously formed composite rod.

Using the proposed method and device will ensure reliable drilling of perforation channels to the maximum penetration depth of pollutant-polluting liquids and recovery of oil (gas) flow rate from wells that are and were in operation.

Information sources

1. Copyright certificate No. 1776771, cl. ЕВВ 43/11, 1992

2. RF patent No. 2147066, cl. ЕВВ 43/11, 2000

3. RF patent No. 224104, Cl. ЕВВ 43/11, 2003 - prototype.

Claims (6)

1. A method of opening productive formations from wells, including drilling perforation channels in the casing wall and the annulus using a drill supplied to the wall of the casing using the drill feed assembly through the conductor, building up the drill after each recess to the length of its shaft automatically supplied from the cassette a rod of the same length, disconnecting the drill feed assembly from the resulting composite rod left in the drilled channel after the perforation channel reaches the design depth, different the fact that throughout the process of forming the perforation channel the drill and the composite rod are kept from moving in the transverse direction inside the conductor rotating together with the drill and the composite rod, and the conductor and the composite rod inside the conductor are fixed from turning at the time of the build-up of the drill. 2. The method according to claim 1, characterized in that the rod supplied from the cartridge is aligned with the conductor and the spindle of the drill feed unit in an emphasis, which is a continuation of the conductor body. 3. A device for implementing the method, including a drilling punch containing an electronic unit, an electric drive, a fixation unit for a punch, a drill, a drill feed unit, a jig, a cassette with integrated cassettes containing drill rods, characterized in that the inner diameter of the jig placed in the jig body and rotating together with the drill and the composite rod, it is made equal to the diameter of the drill rod and the rods supplied from the cassette, and the conductor itself is equipped with fixation units from turning the conductor inside the cond housing uktor and composite rod inside the conductor at the time of the drill. 4. The device according to claim 3, characterized in that the fixation nodes of the conductor and the composite rod are made in the form of spring-loaded balls recessed into the body of the conductor from its inner and outer sides, and corresponding to the spatial arrangement in the body of the drill cutter, composite rods and the conductor body balls deepening. 5. The device according to claims 3 and 4, characterized in that the jig fixation unit is made in the form of spring-loaded balls recessed into the body of the jig body, and the recesses corresponding to the spatial arrangement of the balls are made on the outside of the jig body. 6. The device according to claim 3, characterized in that the casing of the conductor is additionally equipped with a box stop coaxial with the conductor, the inner planes of which are parallel to the axis of the conductor and spindle.

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