RU94628U1 - DEVICE FOR OPERATION OF THE LAYER WITH DIFFERENT PERMEABILITY ZONES - Google Patents

Abstract

 A device for operating a formation with zones of different permeability, including a casing with packers and valves located between the packers and having the ability to control from the mouth, each of which is made in the form of a housing with through holes and an axially movable sleeve made with the possibility of opening and closing holes in extreme positions and equipped with a narrowing, characterized in that it has adhesives for isolation of areas with low permeability, packers are provided for installation within the adhesive d, and filters are placed outside the valves, while for moving the sleeve down the technological column is equipped with a pusher pressed down by a spring, the force of which exceeds the sleeve shear force, a pipe with an annular protrusion, the outer diameter of which is larger than the passage diameter of the sleeve narrowing, but smaller than the corresponding passage the diameters of the narrowing of the sleeves further located from the bottom of the well, and to move the sleeve up the process string is equipped with a grip made in the form of a housing with the outside ins balls, the diameter of the circumscribed circle around the passage diameter is greater than the corresponding sleeve narrowing it, similar to but smaller than the passage diameter constrictions bushings disposed within the well from the bottom, and the spring force is sufficient to shear the respective beads of the sleeve.

Description

The utility model relates to the oil and gas industry, namely to the development and operation of oil reservoirs with zones of various permeability, including using lateral and lateral horizontal shafts from production casing.

It is known "Equipment for the operation of an oil reservoir of two or more layers of one well" (AS USSR No. 1613587 A1, IPC ЕВВ 43/14, publ. Bull. No. 46 dated 12/15/1990), containing concentrically installed in the well a column of elevator pipes with expanding sealing elements successively mounted along its height, non-return valves sequentially placed between the sealing elements, means for mechanized oil lifting and wellhead fittings, moreover, with the aim of increasing efficiency in its operation by providing directional fluid injection into low-permeability interlayers while extracting oil from productive adjacent interlayers, check valves are located on the column of elevator pipes, some of which are installed with the possibility of oil passing from productive interlayers into the column of elevator pipes, and others from the column of elevator pipes in low-permeability layers, and the sealing elements are installed with the possibility of overlapping in the working position of low-permeable and productive layers.

The main disadvantages of this equipment are:

- the lack of filtration in the technological channels, which can lead to a partial or complete loss of the flow area of these channels and the rapid failure of the receiving valves;

- the inability to process specific sections of the reservoir with technological solutions, because reception valves are not adjustable;

- the inability to use this method in an open hole due to the high likelihood of overflow of well fluid through the packer (between the packer and the borehole wall) space at elevated in-situ pressures.

- the impossibility of using this equipment in the lateral and lateral horizontal wellbores, because equipment operation control is carried out from the surface with the help of goods launched on the wire;

- the complexity of the equipment design associated with a large number of nodes and parts, in particular, the design of the control mechanism containing containers interconnected from the outside by tubes is complicated, which reduces the reliability of the equipment and, in the event of a tube breakdown, can lead to an emergency.

The closest in technical essence to the claimed one is "A device for the simultaneous operation of several productive formations in one well" (AS USSR No. 907225, IPC ЕВВ 43/14, publ. Bull. No. 7 from 02/23/1982), made in the form, located in the body part, of the control valve bushings, provided with passage channels and gripping elements and controlled from the day surface by means of a control mechanism provided with a reciprocal gripping element, moreover, in order to enable the formation flow rate to be controlled at achitelnyh interstratal pressure drops, the gripping elements of the valve plugs located above the flow channels, and the control mechanism is configured in the form of two spring-loaded radially and kinematically interconnected half sleeves of which is situated the gripping element control mechanism. In addition, in order to enable selective movement of the valve sleeves up and / or down, the gripping element of the control mechanism is made with an end working surface on one side and with a conical surface on the other, and the gripping elements of the valve sleeves are made in the form of annular protrusions with different lengths, decreasing towards the bottom of the well, and the spring-loaded half-sleeves of the control mechanism are equipped with replaceable liners with grooves made in them, the length of which corresponds to the length of the annular protrusions to apannyh sleeves. Moreover, in order to accurately control the moment the valve sleeves are set and released by the control mechanism, ring-shaped protrusions are made on the body part, and replaceable and / or installation-movable protrusions are made on the half-shells of the control mechanism to interact with the protrusions on the body part.

The disadvantages of this equipment are:

- the impossibility of using this method in an open hole due to the high probability of overflow of well fluid through the packer (between the packer and the well wall) space at elevated in-situ pressures.

- the impossibility of using this equipment in the lateral and lateral horizontal wellbores, because the device operation control mechanism is suspended on a cable;

- the complexity of the design of equipment associated with a large number of components and parts requiring precise adjustment and adjustment.

The technical task of the proposed device is the selectivity of work and processing in an open formation with different permeability, which leads to increased profitability of such layers during the operation of wells, including with lateral and lateral horizontal shafts, due to more complete extraction of hydrocarbons, elimination of emergency situations associated with unauthorized flows of well fluids from one zone to another, and improving the reliability of the well control mechanism by adjustable valves.

The technical problem is solved by a device for operating a formation with zones of different permeability, including a casing with packers separating the layers and adjustable from the mouth valves located between the packers, each controlled valve made in the form of a housing with through holes and an axially movable sleeve made with the possibility of opening and closing holes in extreme positions under the action of a pusher and / or grip, and each sleeve is equipped with a narrowing, the passage diameter of which is smaller closer than the valve is closer to the bottom of the well.

What is new is that patches are placed on the outside of the packers and filters on the outside of the valve bodies, while the pusher and / or grip are connected to the process column to move the sleeve, the pusher used to move the sleeve down is made in the form of a spring pressed down, the force of which exceeds the shear force of the sleeve, the nozzle with an annular protrusion, the outer diameter of which is greater than the passage diameter of the corresponding narrowing of the sleeve, but less than the similar passage diameters of the narrowing of the bushings further located from the bottom of the well, and the grip used to move the sleeve up is made in the form of a body with balls drawn out by springs; the diameter of the circumference around the balls described is larger than the passage diameter of the corresponding sleeve narrowing, but smaller than the similar passage diameters of the bushings narrower further from the bottom of the hole , and the force of the springs is sufficient to shift the corresponding sleeve balls.

Figure 1 shows a diagram of the simultaneous-separate operation of the reservoir in a horizontal wellbore.

Figure 2 - design of the filter with a controlled valve.

Figure 3 and figure 4 - respectively, the process of opening and closing a controlled valve.

The device operates as follows.

After drilling a well 1 (see FIG. 1), casing 2 is cemented above the producing formation 3. Opening of the formation 3 is made by deepening the bore 4. After that, geophysical studies of the formation 3 in the deepening of the bore 4 are made to identify areas with low permeability 5. Isolation zones with low permeability 5 layer 3 is produced by installing patches 6 of the required length (from 10 to 50 m), hermetically installed opposite these zones 5. If necessary, additional isolation of zones with low permeability 5 before installing patches 6 These zones are pumped hydrophobic composition. The pipe string 7 is lowered with packers 8 and 9 (each not more than 3 m long), respectively isolating layer 3 and zones with low permeability 5, and valves 10 (see Figs. 2-4) placed between packers 9 (see figure 1), installed within the patches 6 and isolating zones with low permeability 5. Since the size of the patch 6 is much larger than the size of the packer 9, technical problems in installing packers 9 within the patches 6 do not occur. Valves 10 (see Fig. 2-4) are equipped with filters 11 before descent (see Fig. 1, 2), to prevent the passage of large solid particles with the formation 3 (see Fig. 1), which can lead to exit building moving parts of the valve 10 (see Fig.2-4). The valves 10 of the pipe string 7 (see Fig. 1) are made controllable with the possibility of mechanical opening (see Fig. 3) and closing (see Fig. 4) for the production of formation 3 (see Fig. 1) from areas with high permeability 12 through filters 11.

Controlled valves 10 (see figure 2) can be made of any known design with mechanical control from the wellhead 1 (see figure 1), for example, in the form of a housing 13 (see figure 2) with passage holes 14 and movable in the axial direction of the sleeve 15, made with the possibility of opening (see figure 3) and closing (see figure 4) of the holes 14 in the extreme positions. Moreover, each sleeve 15 (see figure 2) is equipped with a narrowing 16, the bore diameter of which is less, the valve 10 is closer to the bottom 17 (see figure 1) of the well 1.

To move the sleeve 15 (see Fig. 3) down the process string 18 (for example, coiled tubing) is equipped with a pusher 19 made in the form of a spring 20 pressed downward, the force of which exceeds the shear force of the sleeve 15, the pipe 21 with an annular protrusion 22, the outer diameter of which more than the bore diameter of the corresponding narrowing 16 of the sleeve 15, but less than the same bore diameters of the narrowing 16 of the sleeve 15 further located from the bottom 17 (see figure 1). When descending into the well, the pusher 19 (see Fig. 3) passes valves 10 (see Fig. 1) overlying from the bottom 17 (see Fig. 3) due to the inclined bevels of their constrictions 16 and the inclined bevels of the protrusion 22, until it stops in the corresponding narrowing 16 of the sleeve 15, which moves down under the weight of the technological string 18. Upon reaching the lower extreme position of the sleeve 16 (for example, before it interacts with the stop 23), the spring 20 is compressed and the technological string 18 is unloaded to narrow 16 of the sleeve 15, which is marked by a decrease weight of the process column 18 on the wellhead indicator weight (Fig. Not shown). After which the technological column 18 with the pusher 19 is removed from the well 1 (see figure 1)

To move the sleeve 15 (see Fig. 4), the process column 18 (for example, coiled tubing) is equipped with a gripper 24 made in the form of a housing 25 with the ball 27 pressed outward by the spring 26. The force of the spring 26 is sufficient to shift the sleeve 15 by the ball 27. Outer diameter the circumference described around the balls 27 is larger than the passage diameter of the corresponding narrowing 16 of the sleeve 15, but smaller than the similar passage diameters of the narrowing 16 of the sleeve 15 further located from the bottom 17 (see figure 1). When descending into the well, the gripper 24 (see Fig. 4) passes valves 10 (see Fig. 1) overlying from the bottom 17 (see Fig. 4) due to the inclined bevels of their constrictions 16 until it stops against the corresponding constriction 16 of the sleeve 15 , which rests on a stop 23. Under the weight of the technological column 18, the balls 27, interacting with the chamfers of the corresponding narrowing 16, compress the spring 26 and are sunk into the housing 25 of the gripper 24. After that, the balls 27 pass this narrowing 16, which is controlled by the depth of the grip 24 and is recorded short-term reduction in the weight of the process column 18 at the mouth tion indicator weight. Then capture 24 for guaranteed passage of the ball - 27 through the narrowing 16 of the sleeve 15 is lowered down by 05-1.5 meters, followed by lifting up. As a result, the balls 27 abut from the side of the face 17 (see Fig. 1) in the narrowing 16 (see Fig. 4) of the corresponding sleeve 15, raising it to the upper extreme position (for example, until it interacts with the stop 28). Then, under the force of a lifting mechanism (not shown in Fig.), Pulling the process column 18 up, the balls 27, interacting with the chamfers of the corresponding narrowing 16, compress the spring 26 and are sunk into the housing 25 of the gripper 24 and pass this narrowing 16. Then the technological column 18 with the capture 24 is removed from the well 1 (see figure 1).

Since when placing the pipe string 7, the distance between the installed valves 10 (see Figs. 2-4) is recorded in the log, then for the simultaneous movement of the corresponding bushings 15 (see Figs. 4 and 3) for one shutter-lift up and down. the process column 18 is equipped with pushers 19 and grippers 24, respectively, connected by technological sleeves (not shown in FIG.) using the lower 29 (see FIGS. 4 and 3) and the upper 30 threads, so that when the protrusions 22 (see FIG. .3) pushers 19 with corresponding narrowings 16 of the bushings 15, grippers 24 (see figure 4) ayutsya below their respective constrictions 16, bushings 15 by 0.5-1.5 meters. When moving down under the weight of the technological column 18 (see Fig. 3), all sleeves 15 corresponding to the pushers 19 move down to the stop 23, and the possibility of axial movement of the pipe 21 relative to the pusher 19 eliminates tolerances in the manufacture of pushers 19 and when assembling technological pipes with other pushers 19. The end of the operation of moving the corresponding sleeves 15 down is recorded by a decrease in the weight of the process pipe string 18 on the wellhead weight indicator. When moving up the processing column 18 (see figure 4), the balls 27 abut from the bottom to the narrowing 16 of their respective bushings 15, moving them all the way to 28. Since the sequence of moving up of the bushings 15 is not regulated and there is a tolerance of 1 m (0.5 -1.5 m) eliminates erroneous omissions and not upward movement of the corresponding sleeves 15. After that, the production string 18 with the technological pipes 21, grippers 24 and pushers 19 (see figure 3) is removed from the well.

Moreover, the movement of the sleeves 15 (see figure 3) down is for the valve 10 opening, and up - closing (see figure 4), or vice versa (figure 2-4 not shown) is determined by the developers for each particular well 1 (see figure 1).

For research, treatment with reagents or production of formation 3 from one of the zones 12 or several zones of high permeability, valves 10 (see figure 3), located opposite these zones 12 (see figure 1) are placed in the "open" position ( see figure 2 and 3), and the rest in the "closed" position (see figure 4) as described above.

To pump the reagents into a certain zone of high permeability 12 with subsequent exposure, transfer all valves 10 (see figure 4) to the closed position. Then the casing is equipped with a corresponding valve 10 pusher 19 (see figure 3) and located below the grip 24 (see figure 4). After opening the corresponding valve 10 (see Fig. 3), the reagents necessary for treating the formation are pumped into this zone 12 (see Fig. 1) through the process column 18 through the filter 11, after which the valve 10 (see Fig. 4) is closed and withstand the necessary time. In this case, the production string 18 may not be under pressure, and through it can be flushed well 1 (see figure 1) to displace the remaining reagents in the well.

Next, the necessary valves 10 (see Fig. 3) are torn from the zones of high permeability 12 corresponding to these valves 10 (see Fig. 1) to produce the formation 3.

To carry out work related, for example, to the flooding of one or more zones of high permeability 12, consecutive opening and closing of the valves 10 is carried out (see, respectively, FIGS. 3 and 4). Then, if necessary, treated with reagents (for example, hydrochloric acid) selected zone of high permeability 12 (see figure 1) with the corresponding open valves 10 (see figure 3) and the remaining remaining valves 10 (see figure 4). Then a decision is made which valves 10 to close and which to open (see Figs. 3 and 4).

Then continue the production of formation 3 of the well 1 by any known method (for example, by submersible pump).

The proposed device makes it possible in any combination of selective work and processing in an open formation with different permeabilities, which leads to an increase in the profitability of such formations during the operation of wells, including with lateral and lateral horizontal shafts, due to more complete extraction of hydrocarbons, elimination of emergency situations, associated with unauthorized flows of well fluids from one zone to another, and improving the reliability of the well control mechanism by adjustable valves.

Claims (1)

A device for operating a formation with zones of different permeability, including a casing with packers and valves located between the packers and having the ability to control from the mouth, each of which is made in the form of a housing with through holes and an axially movable sleeve made with the possibility of opening and closing holes in extreme positions and equipped with a narrowing, characterized in that it has adhesives for isolation of areas with low permeability, packers are provided for installation within the adhesive d, and filters are placed outside the valves, while for moving the sleeve down the technological column is equipped with a pusher pressed down by a spring, the force of which exceeds the sleeve shear force, a pipe with an annular protrusion, the outer diameter of which is larger than the passage diameter of the sleeve narrowing, but smaller than the corresponding passage the diameters of the narrowing of the sleeves further located from the bottom of the well, and to move the sleeve up the process string is equipped with a grip made in the form of a housing with the outside ins balls, the diameter of the circumscribed circle around the passage diameter is greater than the corresponding sleeve narrowing it, similar to but smaller than the passage diameter constrictions bushings disposed within the well from the bottom, and the spring force is sufficient to shear the respective beads of the sleeve.