RU2386006C1 - Method of conducting, fixation and reclamation of multidirectional well - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: method includes drilling of main well up to the latest by depth of branching, fixation of it by pipes, drilling of additional strings with following its fixation by tangs from main string. Main string is at first drilled up to roof cladding of top producing formation with set of zenith angle and it is fixed, then there are deepen of its location in thickness of the most productive stratum with fixation by expanded pipes with located on it if necessary packers, clipping productive stratums from each other and it is implemented its development. Then from main string it is implemented contiguous drilling, fixation and development of additional strings from bottomhole up to roof of top productive stratum with location of bottomhole of additional strings in different productive stratums. Drilled and completed bores are isolated from following additional bore in the process of drilling, fixation and development.

EFFECT: increasing production abilities of well, reduction of temporal, labour and material consumptions for conduction, fixation and development of multidirectional well.

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Description

The invention relates to the field of well construction, and in particular to methods for carrying out, securing and developing multilateral wells.

A known method of wiring and fastening a directional well with opening the reservoir in a horizontal section of the trunk (patent RU No. 2089714, C1 E21B 7/04, publ. Bull. No. 25 from 09/10/1997), including wiring and fastening of the upper part of the main trunk casing pipes of the technical string above the production horizon, further conducting the trunk with a set of zenith angle and stabilizing it before reaching the horizontal section of the well with the entrance to the reservoir, further fixing the barrel with casing the casing string, with its introduction into the reservoir at the horizontal section of the well, after which the horizontal section of the well is drilled with a bit with a diameter smaller than the diameter of the main shaft, open bottom to the design value.

The disadvantage of this method is to reduce the area of filtration of the reservoir fluid, when posting a horizontal section of the well with a smaller diameter bit. The horizontal section is not cased with metal pipes, as a result of this, collapses can occur in weakly cemented rocks.

There is another method of drilling an additional wellbore from the production casing of the well (patent RU No. 2172384, C2 E21B 7/06, publ. Bull. No. 23 of 08.20.2001), including drilling an additional wellbore from the production casing of the well to the top of the reservoir using deflector, pumping insulating material into the well, securing the drilled part of the additional wellbore with expandable profiled pipes, opening the reservoir while maintaining pressure at the bottom that is equilibrium with the in-situ or depressive in relation to him.

The known method related to the technology of drilling additional shafts from production wells, is effective for drilling sidetracks in low-yield, waterlogged and inactive wells. However, for the construction of new wells, the known method is not effective, in view of the fact that a fixed deflector is installed in the main trunk for kicking the additional well, as a result of which the main well is eliminated and the production capacity of the well decreases.

The closest technical solution, taken as a prototype, is a method for holding and fixing a multilateral well (patent RU No. 2074944, C1 E21B 7/04, publ. Bull. No. 7 of 03/10/1997), which consists in drilling the main well to the last the depth of branching, fixing the main trunk with pipes, drilling additional trunks with their subsequent fastening with shanks from the main trunk.

The disadvantages of this method are:

- the exclusion of the main wellbore from the process of fluid selection directly from any reservoir and, as a result, the reduction of production capabilities of the well;

- the difficulty in drilling additional shafts, as additional devices are required to isolate each of the drilled and fixed shafts and additional tripping and installation operations for their installation during drilling and fastening of the next additional trunk;

- difficulty in the development of additional wells, due to the fact that additional devices and devices are required for getting into each individual barrel and additional tripping and lifting operations for their installation during the development of a multilateral well;

- when a water inflow occurs in one of the additional shafts, additional hydrodynamic studies of each trunk are required;

- additional tripping operations are needed to drill the upper alloy drill pipes included in the production string when attaching additional shafts.

The technical task of the invention is to increase the production capabilities of the well, due to the fact that the main wellbore is carried out in the thickness of the most productive formation and participates in the selection of fluid, preservation of reservoir properties of the formation, by eliminating the cementing operation of the main well in the thickness of the productive formation, simplification of drilling technology, fastening and development of a multilateral well due to the fact that a removable sealing deflector allows you to isolate each well being drilled from previously drilled fixed and mastered shafts, and monitoring the state of each individual wellbore during its drilling, fastening and development due to the fact that each wellhead is drilled, fastened and mastered in succession, after which the next wellhead is being built, in addition, drilling operations for light alloy wheels are excluded drill pipes, since the mounting of additional trunks is made below the departure of the additional barrel from the main one.

The solution to this problem is achieved by the method of conducting, fixing and developing a multilateral well, including drilling the main trunk to the roof of the first producing formation and fixing it, wiring the main trunk into the thickness of the most productive formation, fixing and developing the main trunk, drilling additional shafts into various productive formations, fixing them and the development of each trunk individually.

What is new is that the main trunk is first drilled to the roof of the upper productive formation with a set of zenith angle and fastened, then deepened to place it in the thickness of the most productive formation with fastening by expandable pipes with packers placed on them if necessary, cutting off the productive layers from each other , and make its development, then sequential drilling, fastening and development of additional trunks from the bottom to the top of the upper productive layer with the placement of faces for additionally trunks in different reservoirs, wherein the previously drilled and isolated from the ceca mastered following additional trunk in the process of drilling, fastening and development.

Figure 1 shows a multilateral well in the case when the main well is drilled in the thickness of the reservoir located in the upper part of the geological section.

Figure 2 shows a multilateral well in the case when the main well is drilled in the thickness of the reservoir located in the middle of the geological section.

Figure 3 shows a multilateral well in the case when the main well is drilled in the thickness of the reservoir located in the lower part of the geological section.

The method is performed in three versions.

1 option.

Carry out the drilling of the main trunk 1 (figure 1) to the roof 2 'of the upper reservoir 2 with a set of zenith angle. The main wellbore 1 is cased with metal casing 3, and then they are secured by pouring cement mortar 4 by any known method (for example, direct cementing). After that, drilling of the main trunk 5 into the thickness of the most productive formation 2, located in the upper part of the geological section, continues with a diameter that allows the drilling tool to pass through the casing 3 to the design depth. Then, a shank composed of expanded pipes 6 is lowered. The expanded pipes 6 are expanded by any known method (for example, by flaring or turning). Perforation is carried out in the lower part of the expanded pipes 6 by any known method (for example, using a cumulative perforator PK-103). In this case, perforation channels are formed - filter 7. Next, the main barrel 5 is mastered.

To conduct the first additional barrel 8, in the main barrel 5, at a design depth above the perforation zone of the main barrel 5, a removable sealing deflector 9 is installed (for example, a hydraulic deflector, see RF Patent No. 2311522) (fig. 1 is shown conditionally) and a window is cut into expanded pipes 6. Next, the first additional trunk 8 is posted in the thickness of the underlying formation 10 to the design depth, and then the trunk 8 is cased and fixed using any known shank 11 with packers 12 (for example, profile overlap spruce, see AS USSR No. 1367586 “Connection of profile pipes of well overlap”, cemented liner, etc. with the installation of packers on them, for example, annular packer P3-216 see RF Patent No. 2143053), with the aim of cutting off productive formations 2 and 10 from each other. Perforate the shank 11 by any known method. In this case, perforation channels are formed - filter 7. Next, the development of the additional barrel 8 is carried out. A removable sealing deflector 9 isolates the main barrel 5 from the effects of flushing fluid, drill cuttings and the influence of hydraulic pressure that occurs during drilling, fastening and development of the additional barrel 8, in order to conservation of reservoir properties of the developed reservoir 2.

To conduct the second additional barrel 13, a removable sealing deflector 9 is reinstalled in the main shaft 5 from the bottom to the casing 3 of the main barrel 1. In the expanded pipes 6, a window is cut, then the second additional barrel 13 is wired in the thickness of the underlying formation 14 to the design depth. Next, the barrel 13 is cased and fixed using any known shank 15 with packers 12, in order to cut off productive formations 2, 10 and 10, 14 from each other. Perforation of the shank 15 is carried out by any known method. In this case, perforation channels are formed - filter 7. Next, the development of the additional barrel 13 is carried out. The removable sealing deflector 9 isolates the main 5 and additional 8 shafts from the effects of flushing fluid, drill cuttings and the influence of hydraulic pressure that occurs during drilling, fastening and development of the additional barrel 13 , in order to preserve the reservoir properties of the developed reservoirs 2 and 10.

Carrying, securing and mastering other additional trunks, if necessary, is carried out similarly to conducting, securing and mastering additional trunks 8 and 13.

Option 2.

Carry out the drilling of the main trunk 16 (figure 2) to the roof 17 of the upper reservoir 17 with a set of zenith angle. The main wellbore 16 is cased with metal casing pipes 18, and then they are fixed by pouring cement mortar 19 in any known manner (see option 1). After that, drilling of the main shaft 20 into the thickness of the most productive formation 21, located in the middle of the geological section, continues with a diameter that allows the drilling tool to pass through the casing 18 to the design depth. Then the liner, composed of the expanded pipes 22, with the packers 23 is lowered (see AS USSR No. 1367586 “Connection of profile pipes of well shutoffs”), while the packers 23 are installed to cut off the productive formations 17 and 21 from each other. Expand the expanded pipes 22 by any known method (see option 1). Perforation is carried out in the lower part of the expanded pipes 22 by any known method (see option 1). In this case, perforation channels are formed - filter 24. Next, the development of the main barrel 20 is carried out.

To conduct the first additional barrel 25, in the main barrel 20 at a design depth above the perforation zone of the main barrel 20, a removable sealing deflector 9 is installed (see option 1) (shown in figure 2 conventionally) and a window is cut out in the expanded pipes 22. Then, wiring is carried out the first additional trunk 25 in the thickness of the underlying formation 26 to the design depth, and then the trunk 25 is cased and fastened with a shank 27 with packers 28 (see option 1), in order to cut off the productive formations 21 and 26 from each other. Perforation of the shank 27 is performed. At the same time, perforation channels are formed - filter 24. Next, the development of the additional shaft 25 is carried out. The removable sealing deflector 9 isolates the main shaft 20 from the effects of flushing fluid, drill cuttings and the influence of hydraulic pressure that occurs during drilling, fastening and development of additional trunk 25, in order to preserve the reservoir properties of the developed reservoir 21.

To conduct the second additional barrel 29, the removable sealing deflector 9 is reinstalled in the main shaft 20 from the bottom to the casing 18 of the main shaft 16 and in the interval above the roof 17 'of the upper reservoir 17. In the expanded pipes 22, a window is cut, then the second additional trunk 29 in the thickness of the overlying formation 17 to the design depth. Next, the barrel 29 is cased and fastened with the help of a shank 30 with packers 28, in order to eliminate behind-the-casing flows. Perforation of the shank 30 is performed. At the same time, perforation channels are formed - filter 24. Next, the development of the additional barrel 29 is carried out. The removable sealing deflector 9 isolates the main 20 and the additional 25 shafts from the influence of drilling fluid from drill cuttings and the influence of hydraulic pressure that occurs during drilling, fastening and the development of an additional trunk 29, in order to preserve the reservoir properties of the developed strata 21 and 26.

Carrying out, securing and mastering other additional trunks, if necessary, is carried out similarly to conducting, securing and mastering additional trunks 17 and 26, while first sequentially conducting, securing and mastering additional tables in the underlying productive formations, and then sequentially in the overlying strata, while the sealing deflector 9 when conducting additional shafts in the overlying strata is installed in the intervals between productive strata.

3 option.

Carry out the drilling of the main trunk 31 (figure 3) to the roof 32 'of the upper reservoir 32 with a set of zenith angle. The main wellbore 31 is cased with metal casing 33, and then they are secured by pouring cement mortar 34 in any known manner (see option 1). After that, drilling of the main shaft 35 into the thickness of the most productive formation 36, located in the lower part of the geological section, continues with a diameter that allows the drilling tool to pass through the casing 33 to the design depth. Then lower the shank, composed of the expanded pipes 37, with packers 38 (see option 2), while the packers 38 are installed to cut productive formations 32, 39 and 36, 39 from each other. Expand the expanded pipes 37 by any known method (see option 1). Perforation is carried out in the lower part of the expanded pipes 37 by any known method (see option 1). In this case, perforation channels are formed - filter 40. Next, the main shaft 35 is mastered.

To conduct the first additional barrel 41, in the main shaft 35 at a design depth above the perforation zone of the main shaft 35, a removable sealing deflector 9 is installed (see option 1) (shown in Fig. 3 conventionally) in the interval between the productive formations 32, 39 and a window is cut out in expandable pipes 37. Next, the first additional barrel 41 is wired in the thickness of the overlying formation 39 to the design depth, and then the barrel 41 is cased and fastened with a shank 42 with packers 43 (see option 1), in order to exclude annulus shackles. Perforation of the liner 42 is performed. At the same time, perforation channels are formed - filter 40. Next, development of the additional shaft 41 is carried out. A removable sealing deflector 9 isolates the main barrel 37 from the effects of flushing fluid, drill cuttings and the influence of hydraulic pressure that occurs during drilling, attachment and development of additional trunk 41, in order to preserve the reservoir properties of the developed reservoir 39.

To conduct the second additional barrel 44, a removable sealing deflector 9 is reinstalled in the main shaft 35 from the bottom to the casing 33 of the main shaft 31 and in the interval above the roof 32 'of the upper reservoir 32. In the expanded pipes 37, a window is cut, then the second additional barrel 44 in the thickness of the overlying formation 32 to the design depth. Next, the barrel 44 is cased and fastened with the help of a shank 45 with packers 43, in order to eliminate behind-the-casing flows. Perforation of shank 45 is performed. Perforation channels are formed - filter 40. Next, development of an additional barrel 44 is carried out. A removable sealing deflector 9 isolates the main 35 and additional 41 shafts from the effects of flushing fluid, drill cuttings and the influence of hydraulic pressure that occurs during drilling and fastening and the development of an additional trunk 44, in order to preserve the reservoir properties of the developed strata 36 and 39.

Holding, securing and mastering other additional trunks, if necessary, is carried out similarly to conducting, securing and mastering additional trunks 41 and 44.

Expandable pipes 22 (FIG. 2) or 37 (FIG. 3) are equipped with appropriate packers 23 (FIG. 2) or 38 (FIG. 3) as necessary in cases where the most productive formation 21 (FIG. 2) or 36 ( figure 3) is not located in the upper part of the geological section.

The proposed method provides an increase in the production capabilities of the well, due to the fact that the main wellbore is carried out in the thickness of the most productive formation and participates in the selection of fluid, preserves the reservoir properties of the formation, by eliminating the cementing operation of the main well in the thickness of the productive formation, simplifies drilling, fastening and development of a multilateral well due to the fact that a removable sealing diverter allows you to isolate drilled, fixed and mastered shafts from the next borehole Osya barrel and excluded operations for installation and removal of different plugs and packers to isolate previously drilled shafts. Also, this method provides the monitoring of the state of each individual wellbore during its drilling, fastening and development due to the fact that each wellbore is drilled sequentially, fastened and mastered, after which the next wellbore is built. In addition, the proposed method allows to exclude operations for drilling alloy pipes in the main trunk after attaching additional trunks with shanks, due to the fact that the shanks are attached without entering the main trunk.

And as a result, the proposed method can significantly reduce the time, labor and material costs of conducting, fixing and developing a multilateral well.

Claims (1)

A method for carrying out, fixing and developing a multilateral well, including drilling the main well to the last branching depth, fastening it with pipes, drilling additional trunks with their subsequent fastening with shanks from the main well, characterized in that the main well is first drilled to the roof of the upper producing formation with a set zenith angle and fasten it, then deepen it to accommodate in the thickness of the most productive layer with fastening by expandable pipes with a pack placed on them if necessary frames, cutting off the productive formations from each other, and carry out its development, then sequential drilling, fastening and development of additional trunks from the bottom to the top of the upper productive layer with the placement of additional trunks in various productive formations are carried out from the main trunk, while previously drilled and mastered trunks isolate from the next additional trunk in the process of its drilling, fastening and development.

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