RU2652400C1 - Method and device for an interval study of a horizontal well bore - Google Patents

Abstract

FIELD: measurement technology.

SUBSTANCE: invention relates to a method for an interval study of a horizontal wellbore and an apparatus for carrying out this method. Method for studying the horizontal wellbore includes strickling and washing the wellbore, paying out on the string of pipes of the perforated body with two packers in the interval of installation, packers setting, selection of production of a layer from the space between packers through the perforation of the body, determination of water cutting of the production, carrying out water shut-off works with high water cutting of the production, transfer of packers to the transport state, moving the body with packers to the next installation interval and restudy of the formation of the layer production. Perforated holes of the body before the paying out are provided with valves that pass from the outside to the inside. Plugged end of the body is equipped with two anchors, of which the near to the face is mechanical, and the far one is hydraulic. Packers are made in the form of elastic cups placed between the stops. Cups near the packer, located closer to the face, are made of a less elastic material than the cups of another packer. Body on the side of the mouth is supplied with a pulling hydraulic jack. After the device is lowered into the installation interval, a pipe string with the body is rotated to install a mechanical anchor, after which, in the body, an overpressure is created through the pipe string to install the hydraulic packer. Pipe string is unloaded, creating an axial force for moving the packer stops towards each other, compressing the cups and sealing the downhole space. Cups from the less elastic material of the packer, located closer to the face, are set first. After examining the interval between the packers to transfer the device to its initial transport position, the pipe string at the mouth is raised. Axial force on the body and anchors are created, a piston in the cylinder of the hydraulic jack is moved, translating into active status. When there is a lack of axial force in the pipe string, excessive pressure is created, and the hydraulic jack creates an additional tractive force sufficient to transfer the device to the transport position. After moving the device to a new installation interval, the operations are repeated.

EFFECT: technical result is the expansion of technological capabilities.

2 cl, 6 dwg

Description

The invention relates to the oil and gas industry, and in particular to methods and devices for determining intervals of water inflow and their isolation in directional and horizontal wellbores.

A device for shutting off the inflow of produced water in wells with horizontal bottom hole (patent for utility model RU No. 30158, ЕВВ 33/12, publ. 06/20/2003, bull. No. 17). This device includes inflatable packers launched on a string of tubing (tubing), while one of the ends of the tubing is plugged to provide simultaneous packing of the wellbore, and the other is connected to production equipment, and in the tubing there are channels opposite the reservoir, in addition, Opposite the inflatable packers, additional openings are made, which are equipped with direct valves and a pressure relief mechanism for each inflatable packer, while non-return valves are installed in the tubing channels and In the morning of the tubing, a deep pump is installed, and the tubing is additionally equipped with centralizers, which are located in close proximity to the inflatable packers.

This device implements a method of shutting off formation water inflow in wells with horizontal bottom hole, including examining the horizontal section of the well, determining intervals of productive formations and formation water inflow into the well, assembling the device with inflatable packers located at a distance sufficient to isolate the productive formations from water, and lowering the required separation interval and the installation of pressure packers, after packing, depressurization, descent of the submersible pump and its commissioning with selection of products th layer of the productive intervals.

The disadvantages of the data of the method and device are:

- the lack of the ability to carry out waterproofing works, since the sealed zone does not have direct communication with the internal tubing channels;

- the impossibility of sampling liquid from the sealed zone for the analysis of water cut products;

- the impossibility of re-using the device in the well without additional tripping operations, since the shut-off valves installed on it provide only one-time packing without subsequent transfer of the packer from the working to transport position.

The closest to the claimed technical essence and the number of matching essential features is a device for determining intervals of water inflow and their isolation in directional and horizontal wellbores (patent RU No. 2256773, ЕВВ 33/13, 49/08, published on July 20, 2005 in Bulletin No. 20), which includes inflatable packers launched on the tubing string, one of the ends of the tubing being plugged to ensure simultaneous packing of the wellbore, and the other connected to production equipment, the tubing being equipped with centralizers that are located ozheny in proximity to inflatable packers, opposite which in tubing made additional openings, and inside the tubing is installed subsurface pump, the additional openings in the tubing is brought high-pressure conduit of small diameter, the tubing between the inflatable packers have perforations.

This device implements a method for determining the intervals of water inflow and their isolation in directional and horizontal wellbores, including patterning and flushing the wellbore, cleaning the inner surface of the production casing in the intervals of installation of packers, descent on the pipe string of the device assembly with two packers and centralizers in the installation interval installation of packers by injection of pressure through an additional high-pressure water conduit with subsequent maintenance of high pressure, selection of reservoir products and h the space between the packers, determining the water cut of the product, with a high water cut of the product, carrying out waterproofing works, depressurizing the high-pressure water conduit with the transfer of packers to the transport state, moving the device with packers to the next installation interval and repeating the study of the formation products.

The disadvantages of this method and device:

- a high probability of damage to inflatable packers during waterproofing due to the pressure difference between the packer and packer spaces, due to different densities of working fluids (for example, grouting and drilling fluids);

- the difficulty of mounting and lowering the assembly into the well due to the placement of a deep pump with an electric cable and a high-pressure water conduit going to the inflatable packers inside the tubing, especially in wells with a horizontal end.

The technical objectives of the invention are the expansion of technological capabilities due to the repeated use of packers when examining a horizontal wellbore, including a complex configuration, without additional tripping operations, as well as improving the reliability of the device’s packaging by using packers with solid elastic compression cuffs of different densities and anchor devices for support on the walls of the well for reliable fixation of the device in the well, as well as the possibility of trouble-free extraction of the device properties due to the use in the layout of the pulling hydraulic jack.

Technical tasks are solved by the method of interval study of a horizontal wellbore, including the routing and flushing of the wellbore, descent of a perforated body with two packers on a pipe string, installation of packers, selection of formation products from the space between packers through perforation of the body, determination of water cut, at high water cut products, waterproofing, transferring packers to transport, moving the case with packers to the next int installation interval and re-examination of formation production.

What is new is that the perforated openings of the body before the descent are equipped with valves that let the inside out, and the muffled end of the body is equipped with two anchors, of which the closest to the bottom is made mechanical and the longest with hydraulic, packers are made in the form of elastic cuffs placed between the stops, and the cuffs the packer located closer to the bottom is made of less elastic material than the cuffs of the other packer, while the body from the mouth is provided with a pulling hydraulic jack, after the device is lowered into the interval the installations rotate the pipe string with the housing for installing the mechanical anchor, after which the pressure is created in the housing through the pipe string to install the hydraulic packer, the pipe string is unloaded, creating axial force to move the packer stops towards each other, compress the cuffs and seal the downhole space, cuffs of the less elastic packer material located closer to the bottom are installed first, after examining the interval between packers to transfer the device to the beginning - transport position, the pipe string at the mouth is raised, creating axial force on the body and anchors and moving the piston in the hydraulic jack cylinder, putting it into working condition, when the axial force is not enough in the pipe string, excessive pressure is created, and the hydraulic jack creates additional traction force sufficient to transferring the device to the transport position, after moving the device to a new installation interval, the operations are repeated.

The technical problems for the implementation of this method are solved by the device for the interval study of the horizontal wellbore, including a casing with perforated holes lowered on the pipe string, equipped with two packers along the edges, while one of the casing ends is muffled.

What is new is that the perforated openings of the casing are equipped with valves passing from the outside to the inside, and the muffled end of the casing is equipped with two anchors, of which the closest to the bottom is made mechanically with the possibility of installation by turning the pipe string with the casing, and the distant is hydraulic with the ability to set the pressure created in the housing through a column of pipes, packers are made in the form of elastic cuffs placed between the stops and made with the possibility of sealing the wellbore with mechanical movement of the stops on I rub each other with the axial force generated when unloading the pipe string after the anchors are installed, the cuffs of the packer closer to the bottom are made of less elastic material than the cuffs of the other packer, while the body on the mouth side is equipped with a pulling jack made with the possibility of translation device in transport position by creating axial traction on the body towards the mouth after the cylinder and piston of the hydraulic jack are apart and creating excessive pressure in the pipe string.

In FIG. 1 shows the installation of the device in the well in the test interval, FIG. 2 - upper hydraulic anchor with lower packer (in a partially longitudinal section), in FIG. 3 shows a device case with a check valve (in longitudinal section), FIG. 4 - upper packer (in a partially longitudinal section), in FIG. 5 - lower mechanical anchor (in partially longitudinal section), in FIG. 6 is a section AA in FIG. 5 (increased).

The device for the interval study of the horizontal wellbore 1 (Fig. 1) includes a pipe string 2, a housing 3 with perforated holes 4, equipped at the edges with two packers - the closest 5 to the bottom (in Fig. Not shown) and the far 6 from the bottom. Moreover, the perforated holes 4 of the casing 3 are provided with check valves 7 (Fig. 3), which allow the formation to flow from the outside to the inside, for example, due to the ball valve 10 being pressed against the seat 8 using the spring 9 and not passing back.

The casing 3 (Fig. 1) is sealed from below using a plug 11 and is equipped with two anchors 12 and 13, of which the closest 12 to the bottom is made mechanically with the possibility of installing by turning the pipe string 2, casing 3 with the casing 19 (Fig. 6), and the distant 13 (Fig. 1) - hydraulic with the ability to set the pressure created in the housing 3 through the pipe string 2. Packers 5, 6 are made in the form of elastic cuffs 14 (Fig. 2) and 14 '(Fig. 4), for example rubber, placed between the stops 15 (Fig. 2) and 15 '(Fig. 4), made with the possibility of sealing the wellbore 1 (Fig. 1) with mechanical moving the stops 15 (Fig. 2), 15 '(Fig. 4) towards each other by the axial force created when unloading the pipe string 2 (Fig. 1) after installing the anchors 12, 13. Moreover, the cuffs 14 (Fig. 2) of the packer 5 (Fig. 1), located closer to the bottom, made of less elastic material than the cuffs 14 '(Fig. 4) from another packer 6 (Fig. 1).

In order to eliminate emergency situations associated with the sticking (jamming) of packers 5, 6 in the wellbore 1 when transferring them to the transport position, a pulling hydraulic jack 16 is mounted above the perforated body 3, connected to the pipe string 2, with which they create if necessary, the axial pulling force on the housing 3 towards the wellhead (not shown in FIG.) by creating excessive pressure in the pipe string 2 after the cylinder 17 and the piston 18 of the hydraulic jack 16 are apart.

The proposed method of interval study of the horizontal wellbore 1 is as follows. The wellbore 1 before launching the device is checked using a template (not shown in FIG.) In order to freely pass through the assembly; washing is carried out to remove the wellbore cuttings. Then, on the pipe string 2, the perforated body 3 with packers 5 and 6 is lowered into the required installation interval.

After the device is lowered into the installation interval of the barrel 1, the packers 5, 6 are brought into working position, thereby blocking the space between them from below and above. To do this, they begin to slowly rotate the pipe string 2, housing 3 with housing 19 (clockwise) (Fig. 5). At the same time, the housing 19 of the mechanical armature 12 closest to the bottom (Fig. 1) and the cap 11 fixed at its lower end (for example, using thread) also begin to rotate, and the outer cage 20 (Fig. 5) with dies 21 located in the windows 22 clips 20, due to the outer longitudinal grooves 23 interact with the walls of the borehole 1 (Fig. 1) and remain stationary. The casing 19 (Fig. 5) has a cross section of the outer surface 24 (Fig. 6) with a uniformly varying depth for radial movement of the dies 21 (Fig. 5, 6), so that as the casing 19 rotates, the dies 21 move up and, if there is resistance to rotation of the pipe string 2 (Fig. 1), this indicates the stop of the dies 21 (Fig. 5, 6) in the walls of the well 1 (Fig. 1), the rotation is stopped (mechanical anchor 12 is installed in the well 1).

After that, in the pipe string 2 create excessive hydraulic pressure to install the anchor 13 farthest from the bottom, which through the radial hole 25 (Fig. 2) of the barrel 26 of the armature 13 (Fig. 1) begins to act on the piston 27 (Fig. 2). The piston 27, overcoming the resistance of the spring 28, moves upward, acting through the rods 29 on the dies 30, leading them along the grooves 31 upward at an angle to the stop in the walls of the well 1 (Fig. 1), thus fixing the anchor 13 with the packer 5 in the well 1 The pipe string 2 is unloaded, creating an axial force to move the barrel 26 (Fig. 2) of the packer 5 (Fig. 1) and the barrel 32 (Fig. 4) of the packer 6 (Fig. 1) with the aim of acting through the stops 15 (Fig. 2 ), 15 '(Fig. 4), respectively, on the cuffs 14 (Fig. 2), 14' (Fig. 4).

Since the cuffs 14 (Fig. 2) of the packer 5 (Fig. 1), located closer to the bottom, are made of less elastic material, they are faster deformed in the radial direction to fit against the walls of the well 1. Continuing to unload the pipe string 2, they achieve deformation and fit more rigid cuffs 14 '(Fig. 4) far from the bottom of the packer 6 (Fig. 1) to the walls of the well 1. Thus interpacker space is separated from the rest of the well 1.

Then, the hydraulic pressure is dropped to zero and production of the formation is taken from the space between the packers 5, 6 through the perforated holes 4 of the body 3 and valve 7 (Fig. 3), the water content of the product is determined in this interval.

Due to the non-return valves 7 installed in the perforated holes 4 of the casing 3 (Fig. 1), the formation products fall outside the inside of the casing 3 and then along the pipe string 2 is pumped (not shown) to the wellhead, and the hydraulic pressure created in the pipe string 2 for installing packers 5, 6, does not extend beyond the housing 3.

Next, packers 5, 6 are transferred to the initial transport position. For this, the pipe string 2 at the mouth is lifted, creating an axial force on the housing 3, and due to the anchors 12, 13 the piston 18 is moved upward in the cylinder 17 of the hydraulic jack 16, translating it into working position. In this case, the trunks 26 (Fig. 2) and 32 (Fig. 4) of the packers 5 and 6 (Fig. 1), rising up and spreading the stops 15 (Fig. 2) and 15 '(Fig. 4), remove the load from the cuffs 14 (Fig. 2), 14 '(Fig. 4), which come to their original position, and the dies 30 (Fig. 2) are far from the bottom of the armature 13 (Fig. 1) due to the return spring 28 (Fig. 2), acting on them through the piston 27 and thrust 29, and partially friction against the walls of the well 1 (Fig. 1) also occupy the transport position.

To transfer the armature 12 closest to the bottom to the transport position, the pipe string 2 is continued to be pulled upward, while (and also due to the inclined front surface 33 (Fig. 5) of the dies 21), the dies 21 (loss of adhesion to the walls of the well) of the dies 21 (Fig. 5 , 6), which together with the clip 20 are rotated in the direction of lower resistance, i.e. counterclockwise, and sliding on the surface 24 (Fig. 6) of the housing 19, return to the lower transport position.

If there is a lack of axial force in the pipe string 2 (Fig. 1), an overpressure is created which, through the hole 34 in the stem 35 of the hydraulic jack 16, starts to act on the piston 18 from below, moving it up the cylinder 17 together with the stem 35 and the housing 3. Thus, the hydraulic jack creates additional traction sufficient to translate the device into transport position.

After moving the device to a new installation interval, the operations are repeated until the wellbore 1 is completely examined. Then the device is removed from the well 1. With high water cut, water-proofing operations are carried out.

Thus, the use of the invention allows to expand the technological possibilities of applying the method and device due to the repeated use of packers without additional tripping when examining horizontal wellbores, including complex configurations. At the same time, the device is highly reliable due to the use of packers with integral elastic compression cuffs, which significantly reduces the probability of damage to the packers, and the different density of the material of the upper and lower cuffs makes it possible to seal the device from the bottom up, in addition, due to the use of anchors with different operating principles (mechanical and hydraulic) unauthorized unpacking of the device is excluded, and the presence of a hydraulic jack makes it possible to level the lack of axial force during transfer de device in the transport position, thus avoiding accidents in the well.

Claims (2)

1. A method of interval study of a horizontal wellbore, including patterning and flushing of the wellbore, descent of a perforated body with two packers on a pipe string into the installation interval, installation of packers, selection of formation products from the space between packers through case perforation, determination of water cut, with high water cut products carrying out waterproofing works, transferring packers to a transport state, moving the case with packers to the next installation interval and repeating the test products of the formation, characterized in that the perforated holes of the body before lowering are equipped with valves that let the outside inward, and the plugged end of the body is equipped with two anchors, of which the closest to the bottom is made mechanical and the distant - hydraulic, packers are made in the form of elastic cuffs placed between stops, and the cuffs of the packer, located closer to the bottom, are made of less elastic material than the cuffs of the other packer, while the body on the side of the mouth is equipped with a pulling hydraulic jack, after starting the device into the installation interval, the pipe string is rotated with the housing for installing the mechanical anchor, after which pressure is created in the housing through the pipe string to install the hydraulic packer, the pipe string is unloaded, creating axial force to move the packer stops towards each other, compress the cuffs and seal downhole space, and cuffs of the less elastic material of the packer, located closer to the bottom, are installed first, after examining the interval between the packers for transferring the device to the initial - transport position, lift the pipe string at the mouth, creating axial force on the body and anchors and moving the piston in the hydraulic jack cylinder, putting it into working condition, when the axial force is not enough in the pipe string, create excessive pressure, and the hydraulic jack creates additional traction force sufficient to transfer the device to the transport position, after moving the device to a new installation interval, the operations are repeated. 2. A device for implementing the method, including a housing with perforated openings being lowered on a pipe string, equipped with two packers at the edges, one of the ends of the housing being downhole is muffled, characterized in that the perforated housing openings are equipped with valves that allow the passage from the outside to the inside, and the plugged the end of the casing is equipped with two anchors, of which the closest to the bottom is made mechanical with the ability to install by turning the pipe string with the casing, and the distant is hydraulic with the ability to install The packers created in the housing through the pipe string are made in the form of elastic cuffs placed between the stops and made with the possibility of sealing the wellbore when the stops are mechanically moved towards each other by the created axial force when unloading the pipe string after the anchors are installed, the cuffs of the packer located closer to the bottom, made of less elastic material than the cuffs of another packer, while the body on the side of the mouth is equipped with a pulling hydraulic jack made with the possibility of transfer into The position of the device is by the creation of axial traction on the body towards the mouth after the cylinder and piston of the hydraulic jack are moved apart and excessive pressure is created in the pipe string.

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