The system is completed wells for use in the separate flow of fluid extracted from the side of the wells, the inner ends of which are communicated with the main borehole (options) and the method of separation of the fluid flows produced from these wells

 

(57) Abstract:

The system is completed wells separates and prevents mixing of the produced fluid coming from multiple lateral wells in the main borehole. The system includes a housing separator located and oriented in the main borehole. The building is adjacent to the inner ends of the side wells so that the inlet separate longitudinal passages for fluid in the body of the separator are aligned for receiving the flow of produced fluid from the respective lateral wells. Described different designs, which provide isolated, sealed under pressure the message between the inner ends of each lateral bore and inlet holes for the thread with which they are aligned. Each passage for the flow in the housing can be fitted with a valve with remote control to control the flow of the produced fluid, as well as sensors to monitor various characteristics of the produced fluids. The use of the system allows to extract from the side wells of the immiscible fluid flows, analyze and, if necessary, re-allocate them. 3 C. and 23 C.p. f-crystals, 8 ill.

Narimanova when splitting a fluid flows, extracted from the side of the wells, the inner ends of which are communicated with the main bore, and the method of separation of fluid produced from these wells.

Known system down-hole located in the advanced section of the main bore and provided with a package of spaced apart vertical drainage channels for the side down-hole passing out in a separate formation. Each drainage channel is formed of a relatively short section of pipe, which is attached can be rotated to its upper end to the casing, located in having a large diameter, the so-called "parent" casing, passing upwards to the surface of the earth. When the rod actuator moves downward inside the casing, its lower end turns of the drainage section or below the adapter out, as long as their Central axis is not rejected at a known angle from the axis of the casing. The seals are automatically arranged so as to isolate the flow of the fluid flowing in the channels of the drainage sections. Drainage sections are mounted in spaced apart vertically along the casing points and can be posted at an angle to each other so as to be Venuti, and the cover and the "mother" casing cemented into place, apply oriented diverters to reject the Boers out through each of the drain sections so as to provide drilling multiple deviated wells, passing in formation for effective drainage of the produced fluid. The whipstock is also used to install the casing in each rejected the borehole, which is then cemented. Various cased wellbore after this can be completed and put into operation. The system can be used in combination with newly drilled wells or to resume operation of one or more existing lateral wells. One of the systems that use multiple drain holes to complete the vertical cased wellbore is disclosed in U.S. patent N 5462120. In U.S. patent 5458199 also disclosed drilling and completion mnogotirazhnyh wells.

In the above-mentioned U.S. patent 5462120 disclosed method and system is completed wells intended for use in the separate flow of fluid extracted from the side of the wells, the inner ends of which are communicated with the main borehole. For receiving the produced fluid flowing about the of TVersity, posted on 'the walls of the casing. However, each of the input and drain hole of this system is connected with the lifting tube to the annular space between the casing and the lifting pipe could be used for other purposes. Therefore, the known system does not allow to obtain efficient separation of the flow, which would regulate the produced fluid in the well.

Although the system described above is highly effective for the drainage of some formations, it has the disadvantage that the produced fluids flowing through each drain section are moved together in the casing and in <parent> casing. If from one side of the well is produced for the most part, for example, salt water, this fluid will contaminate the oil extracted from the other side of the wells. On the earth's surface may not be possible to determine from which side of the well is mined salt water. In addition, there is no effective way of tracking and/or control the respective flows of fluid for carrying out remedial works to save receipts fluid from multiple lateral wells Bezostaya system complete wells and method of separating fluid flows, providing channels for individual threads in the extraction fluid from the respective lateral wells and allow you to monitor and/or control the flows of fluid coming out of them, so in order to resolve the above problems associated with known systems.

This technical result is achieved by the fact that the system is complete wells for use in the separate flow of fluid extracted from the side of the wells, the inner ends of which are communicated with the main borehole containing a tubular casing having numerous spaced at an angle to each other drainage facilities, located within its walls and intended for the reception of the extracted fluid coming from the side of the wells, according to the invention, equipped with a separator stream located in the casing with the selected orientation and contains many elements within the passages for flow, spaced relative to each other, with each passage for flow contains an inlet opening, combined with appropriate drainage means, and these inlets in communication with the longitudinal channels going up in the separator flow from each inlet port and extending through the upper mania flow of the produced fluid, passing through each of the longitudinal channel.

It is possible that the system contained a tool for tracking characteristics of the produced fluid in each longitudinal channel. However, it can have a means for controlling the valve means and the means for tracking characteristics from the wellhead. Preferably, the system contains a tool, located on the separator flow and tubular casing and intended to install a separate thread with a predetermined angular orientation of the tubular casing so that the inlet were combined with drainage means. The means for mounting includes a spiral guide surface located on the separator flow and interact with the key means located on the tubular casing and designed for automatic orientation of the separator flow in such a manner that a combination of drainage assets and openings.

Preferably, each longitudinal channel had lower portion, a curved outwards with the formation of a smooth transition to adjacent drainage facilities.

The system may also contain located in the separator flow of funds the eye to provide translation of the corresponding side of the well for production from it using the lifting power of the gas.

It is possible that the system contained an insulating means to provide isolated pressure communication between the drain means and the input holes. The insulating means may include an annular sealing means disposed between the separator flow and tubular casing above and below each inlet or pipe passing through each longitudinal channel in the separator thread in the appropriate drainage facilities. Pipelines can be executed with the ability to move from the upper position in which they are drawn inside the separator flow in the lower extended position in which the lower ends of the pipes extended into adjacent drainage facilities.

Preferably, the system contained the first sealing means to prevent leakage of fluid between the pipelines and the separator flow and the second sealing means to prevent leakage of fluid between the pipelines and drainage means.

The above technical result is achieved by the fact that the system is complete wells for use in the separate flow of fluid extracted from the side of the wells, internal conceptology for lowering into the main bore to the position in which it adjoins the inner ends of the side wells, the passages for the flow in the casing, having inlet openings adapted to align them with the inner ends of the side wells and for receiving the stream of produced fluid coming from these ends of the side wells, and a longitudinal channel passing up into the housing from the inlet and out through the upper end of the housing, and mounting means on the housing for installation of inlet for receiving the flow of produced fluid from the inner ends of the side wells.

It is advisable that the longitudinal channels had upper and lower parts, and the lower parts were bent outwards to ensure a smooth transition for the inner ends of the side wells.

This system, as described previously, may include valve means, means for monitoring characteristics of the produced fluid in each longitudinal channel, means for controlling the valve means and means for tracking characteristics with the mouth of the main bore, an insulating means to provide isolated pressure communication between the inner ends of the side wells and inlet holes.

It is advisable that the system contains means to averted/P> This technical result is achieved by the fact that in the method of separation of the fluid flows produced from lateral wells, the inner ends of which are communicated with the main bore, which passes upwards to the surface, according to the invention, omitting the essentially cylindrical housing into the main bore to the position in which it adjoins the inner ends of the side wells, installed in the housing passages for the flow, which includes the entrance apertures adapted to align them with the inner ends of the side wells and for receiving the extracted fluid coming from these ends, and longitudinal channels, passing up into the housing from the inlet to the upper end of the housing, guide the case through its rotation is performed so that the position of the inlet for receiving the stream of produced fluid coming from the inner ends of the side wells, and shall receive fluid from the side of the wells along the longitudinal channels.

It is preferable to regulate the flow of produced fluid passing through the passages for the flow.

It is desirable to monitor the characteristics of the produced fluid in each pass dlocale lateral wells and inlet holes.

Thus, the present invention provides the possibility of separating a stream of control downward borehole and measurements, as well as purification of incoming lateral wells from sand and other contaminants without the need to disconnect any equipment from the "parent" osadochnoi column.

The present invention has other objectives, features and advantages will be more apparent from the following detailed description of the preferred embodiment variants of the invention with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of completed wells with drain pipes;

Fig. 2 in an enlarged scale separator flow, made in accordance with the present invention;

Fig. 3 is a view in section, illustrating the preferred orientation of longitudinal channels for the flow of fluid in the body of the separator;

Fig. 4 is a right side view of the upper end part of the housing of the separator, schematically illustrating the valve flow control and packet sensors;

Fig. 5 is another view of the upper end part of the housing of the separator, illustrating columns of producing pipes attached to it;

Fig. 6 - view pogo vertical section, illustrating additional structural modifications of the present invention to provide separation of the flow of produced fluid from multiple lateral wells.

As shown in figure 1 well 1 drilled in the soil through the formation of 2-5, and the period b is expanded to a larger diameter on a discrete length. For example, the well 1 may have a diameter of 311,15 mm and a widening gap 6, comprising 660,4 mm in diameter on a segment of length, approximately equal to 9.15 m System 7 complete well with many of the drainage channels of the type shown and described in international publication PCT-application WO 96/23953, installed in the casing 8 in diameter 244,5 mm and placed within a period of 6, followed by the siege of the column 8 and the cover 9 passes sleeve (not shown), performing the turning out of the lower ends of the drainage adapter 10-12 until they lock in place with the seal. After turning outward, corresponding to the Central axis of the drain adapter 10-12 form a given angle with the Central axis of the casing 9, and preferably, they are spaced from each other on the 120oC, compared with their position in the same plane, as shown in figure 1. The outer end of each of the eat is introduced into the casing 8 to be filled by the packer, and casing 8 and the system 7 with plenty of drainage channels are cemented in place in the usual way.

A whipstock (not shown) then moves on drill pipe and is placed in the casing 9, where it automatically focuses its inclined upper surface relative to the upper drainage of the adapter 10 and radially aligned with him. After this lateral hole 13 is drilled to the curve in the formation of 3, casing 14 is inserted into the side hole 13 and is cemented. Lateral bore 13 can be completed and sealed prior to the drilling of the second well 15 through the bleed adapter 11. The whipstock is manipulated so as to align its inclined upper surface relative to the drainage adapter 11, and the side hole 15 drilled, fixed casing 1-6, cemented and ends the same way. Finally, being the third lateral bore 17 is secured to the casing 18 and is completed as described above, and the primary node is installed on the surface. Lateral bore 15 passes into the formation 4, while the lateral bore 17 is in formation 5. If you want to extract from the formation at this point, produced by those who on the surface.

As shown in figure 2, the separator flow, in accordance with the present invention, includes an elongated, generally cylindrical body 20 having guide 21 type "horseshoe mule" button located in the lower part, which interacts with the guide plug 22 of the casing 9 to the rotational orientation of the housing 20 so that its inlet 23 to 25 are aligned with the respective channels of the drainage adapter 1-12. For clarity, the drainage adapter 10-12 are shown in figure 2 lie in the same longitudinal plane. In practice, as noted above, the adapter 10-12, preferably spaced at an angle to each other. Each inlet 23-25 will communicate with a folded down and in the lower parts of the respective longitudinal channels 26-28, which pass upward in the housing 20 to an outlet opening in its upper end. As shown in figure 3, the channels 26-28 spaced angle 120oto each other to ensure that the maximum dimension of the channels within the cross-section of the casing 20 of the separator. Of course, you may apply the construction in which the drain adapter 10-12 and the inlet 23-25 are situated in one plane, but in this case, the dimensions of the channels should 26-28 m its the end of the orientation shown in figure 3. It will be clear that can be applied to a different number of channels 26-28, unlike shown, depending on the configuration of the related system 7 with plenty of drainage channels.

A pair of spaced vertical seals 29, 30, for example made in the form of rings extending sealing seals, Chevron seals, or other similar means, mounted between the housing 20 of the separator and the surrounding inner wall of the casing 9, the insulating fluid medium flowing into the inlet 23 and the channel 26. Similarly, an additional pair of seals 30, 31 and 31, 32 are isolated fluid medium flowing in the inlet openings 24, 25 and the respective channels 27, 28. Thus, the flow of produced fluid is not mixed inside the casing 9 system 7, as it is known in the system.

As shown in figure 4, the upper part 33 of the casing separate valve means for controlling the flow of fluid passing through the channels 26-28, providing independent control of expenditure flows from each side of the well, and means for monitoring characteristics of the produced fluid in each of the channels 26-28, such as consumption, p is acquired, the control valve 34, the actuator 35 which is driven electrically in accordance with the signals on an electrical cable 36 passing on the surface, can be used to control the flow rate of the fluid passing through the channel 27. Cable conductor 36 is also connected to the package 37 sensors located below the control valve 34. Package 37 of sensors includes sensors for determining the pressure of the fluid, flow rate and composition, as well as other characteristics, the signals corresponding to these measurements may be transmitted to the surface via cable 36. Each of the channels 26, 28 is provided with a control valve and a package of sensors as shown in figure 4 relative to the channel 27, and these devices are controlled and monitored by cable 36. If the flow of the produced fluid at the surface shows that probably there is a problem with the extraction of one or more lateral wells, the control valve 34, for example, may be selectively overlap, providing the opportunity to conduct various measurements to determine the nature and extent of such problems so that they can be taken appropriate remedial action.

On figurai pipelines 39 - 41, passing upwards to the surface, screwed, snapped or fastened in another way to this upper part of the body. In this case, extracted from different lateral borehole fluid cannot move in the casing 8 and is supplied to the surface of the individual columns of the pipelines. Various devices (not shown) located on the surface, are used to control flow from each side of the well.

Figure 6 depicts a system in which production from each lateral borehole may be carried out using the lifting power of the gas when the pressure at the bottom of the well to such limits, when necessary such artificial lift fluid. Pipe 42 of small diameter extends from the surface of the compressor down to the connection 43 to the upper housing 44, so that the lifting gas under pressure may be supplied through the passage 45 to the valve 46 of the lifting gas, which will open when a certain set pressure. When the valve 46 of the lifting gas is opened, the gas is blown into the channel 27 through the channel 47 to reduce the density of the produced fluid and, thus, to increase the flow rate of the fluid flow. Each of Cana In figure 7 is shown an alternative system, providing an isolated communication between the lower end of the production tubing 48 and the corresponding one of the drain adapter 10-12, for example, drainage of the adapter 11. The lower part 49 of the production tubing 48 is sent to the appropriate outlet in the upper part of the housing 20 of the separator and is positioned so that the lower part passes into the drain adapter 11. Packer 50, which can be filled by means located near the lower end of the production tubing 48, is installed inside of drainage channel adapter 10 by an appropriate extension to provide a stand-alone passage for the flow of fluid in the primary pipe 48 to the surface. Corresponding pairs of seals 29-32, shown in figure 2, may not apply, but may be used if it is necessary the use of additional seals.

Figure 8 shows another means for providing a stand-alone, compressed under pressure communication between the lower end of the lateral bore and a longitudinal channel for the flow in the housing 20 of the separator, for example, channel 27, which communicates with the casing 16 through the drain adapter 11. Because the h-16. As shown, the retractable tubular element or pipe 51 is placed slidable in the channel 27 and the input port 24 to move between an upper position in which its lower end 52, drawn into the inlet 24, and a lower position where the lower end is pushed out of the drainage channel adapter 11. In the upper position of the pipe 51, the lower end 52 is entirely located inside the housing 20 of the separator so that the housing 20 can be lowered into the casing 9. Protruding outward annular flange 53 on the upper end of the pipe 51 slides within section 54 with an enlarged diameter of the channel 27 and carries a sealing ring 55, which prevents the flow of fluid. Suitable sealing means 56, such as fill the packer is located at the lower end 52 of the tube 51 and seals it against the drainage channel adapter 11, when the tube 51 is fully extended. Such sealing means 57 is located at the upper end of the casing 16. Pipe 51 can be displaced from its upper or working position to its lower or extended position by any suitable means, such as an installation tool that moves along the pipe. In the retracted position, the pipe 51 and the sealing kulturni end of the casing 16 and the channel 27 in the housing 20 of the separator. Isolated communication between casing strings 14, 18 and the respective channels 26, 28 in the housing 20 of the separator are provided in the same manner as shown in figure 8.

The method of separation of flow fluid extracted from the side of the wells is as follows.

Well 1 is drilled and extends in the gap 6, as shown in figure 1, after which mnogogranna system 7 is lowered into the gap 6 of the casing 8. Lateral drainage adapter 10-12 retracted into the casing 9 system during drilling. The expanding sleeve or package is lowered into the casing 9 to rotate drainage adapter 10-12 so that they are deflected downward and to the sides, as shown. Then apply a number of cementing rods and packer (not shown) for cementing casing 8 and mnogogrannoi system 7 in the borehole 1. After that, the whipstock (not shown), passes through the drill pipe is located inside the system 7, and automatically focuses his guide type "horseshoe mule" and the guide or guide pins 22 (Fig. 2) casing 9 so that its inclined striker surface radially aligned with drain adapter 10. Then, below the drainage adapter 10 Boo who I am well maybe if necessary, run horizontally. Well 13 is then fixed casing, which is cemented. After the position and orientation of the whipstock against the remaining two drainage adapters 11, 12 drilled two additional lateral wells 15, 17 passing in the appropriate formation 4, 5 and these wells are fixed casing strings, that are cemented.

After that, the body 20 of the separator is lowered inside the casing 9 mnogogrannoi system on drill pipe, spiral pipe, etc. and automatically focuses surfaces 21 of the guide-type "horseshoe mule and a guide plug 22 so that the inlet 23 to 25 in the housing 20 of the separator coincide exactly with the respective channels of the drainage adapter 10-12. Different pairs of seals 29, 30, 30, 31 and 31, 32 will isolate the flows of fluid extracted from the side of the wells 13, 15, 17 and received in corresponding channels 26 and 28 of the housing 20 of the separator. After that, each lateral bore 13, 15, 17 can be put into operation.

In the case of detecting that one or more lateral wells 13, 15, 17 is extracted fluid is not the team that was expected, or when any other Pte selected control valves 34, and on the surface it reads data from packets 37 sensors to diagnose the problem and carry out the necessary remedial works. Since the relevant extracted streams of fluid are not mixed below the level of the control valves 34, diagnosis, compared with multi-channel drainage systems of the prior art, becomes much more specific. In an alternative implementation of the invention shown in figure 5, control valves 34 may be located on the surface. The design, shown in figure 6, can be used for equipment, if necessary, one or more lateral wells 13, 15, 17 located in the separator flow means for injection of lifting gas in the produced fluids passing through the corresponding passage for the flow to ensure that the translation of the corresponding side of the well for production from it using the lifting power of the gas. The previously described casing 20 of the separator is removed, and the housing 44 of the separator is introduced instead to provide artificial lift. An alternative means is shown in Fig. 7 and 8, to provide isolated compacted under pressure is 10-1 described above. The concepts of the present invention are seen independent of the specific ways in which it is produced or formed lateral wells 13, 15, 17. Lateral bore in which is used casing is only one alternative embodiment of the invention. However, the described system can also be used when the side hole 13, 15, 17 are not fixed columns completions, as well as other types of completions.

Now it will be clear what has been described a new and improved system for separating flow, intended for use in completing a well, where many lateral wells converge to the main borehole. Control flow in a downward borehole and measurements necessary to identify problems that arise during production. Any of the side wells to be decommissioned and serviced without removing any element of the system from the main borehole.

1. The system is completed wells for use in the separate flow of fluid extracted from the side of the wells, the inner ends of which are communicated with the main borehole containing a tubular casing having numerous spaced at an angle to each other, others who were of the side wells, characterized in that it is provided with the separator flow located in the casing with the selected orientation and contains many elements within the passages for flow, are spaced from each other, with each passage for flow contains an inlet opening, combined with appropriate drainage means, and these inlets in communication with the longitudinal channels going up in the separator flow from each inlet port and extending through the upper end of the separator flow.

2. The system under item 1, characterized in that it contains valve means for controlling the flow of produced fluid passing through each of the longitudinal channel.

3. The system under item 2, characterized in that it contains means for monitoring characteristics of the produced fluid in each longitudinal channel.

4. The system under item 3, characterized in that it contains means for controlling the valve means and the means for tracking characteristics from the wellhead.

5. The system under item 1, characterized in that it contains means located on the separator flow and tubular casing and intended to install a separate thread with a predetermined angular orientation is="ptx2">

6. The system under item 5, characterized in that the means for mounting includes a spiral guide surface located on the separator flow and interact with the key means located on the tubular casing and designed for automatic orientation of the separator flow in such a manner that a combination of drainage assets and openings.

7. The system under item 1, characterized in that each longitudinal channel has a bottom portion, a curved outwards with the formation of a smooth transition to adjacent drainage facilities.

8. The system under item 1, characterized in that it contains located in the separator flow means for injection of lifting gas in the produced fluids passing through the corresponding passage for the flow, to ensure that the translation of the corresponding side of the well for production from it using the lifting power of the gas.

9. The system under item 1, characterized in that it contains an insulating means to provide isolated pressure communication between the drainage means and inlet holes.

10. The system under item 9, wherein the insulating means includes an annular sealing with ptx2">

11. The system under item 9, wherein the insulating means includes pipelines passing through each longitudinal channel in the separator thread in the appropriate drainage facilities.

12. System on p. 11, characterized in that the piping is arranged to move from an upper position in which they are drawn inside the separator flow in the lower extended position in which the lower ends of the pipes extended into adjacent drainage facilities.

13. The system under item 12, characterized in that it contains the first sealing means to prevent leakage of fluid between the pipelines and the separator flow and the second sealing means to prevent leakage of fluid between the pipelines and drainage means.

14. The system is completed wells for use in the separate flow of fluid extracted from the side of the wells, the inner ends of which are communicated with the main bore, characterized in that it contains essentially cylindrical body adapted for lowering in the main bore to the position in which it adjoins the inner ends of the lateral wells, the passages for the flow in the housing having input emeu fluid medium, coming from these ends of the side wells, and a longitudinal channel passing up into the housing from the inlet and out through the upper end of the housing, and mounting means on the housing for installation of inlet for receiving the flow of produced fluid from the inner ends of the side wells.

15. The system under item 14, characterized in that the longitudinal channels have upper and lower parts, and the lower part is curved outwards to ensure a smooth transition for the inner ends of the side wells.

16. System on p. 15, characterized in that it contains valve means located in the upper parts of the longitudinal channels and intended for controlling the flow of produced fluid flowing through the longitudinal channels.

17. The system under item 16, characterized in that it contains means for monitoring characteristics of the produced fluid in each longitudinal channel.

18. The system under item 17, characterized in that it contains means for controlling the valve means and for tracking characteristics with the mouth of the main well.

19. The system under item 14, characterized in that it contains an insulating means to provide isolated under pressure, trichomania the fact that the insulating means includes an annular sealing means placed on the body above and below each inlet.

21. The system under item 19, wherein the insulating means includes pipelines made with the possibility of moving them from venutolo position in the housing in the extended position, and pipelines, while in the extended position, have the outer part, protruding from the case.

22. System on p. 21, characterized in that it contains means to prevent leakage of fluid between the pipelines and the housing in the extended position pipelines.

23. The method of separation of flow fluid extracted from the side of the wells, the inner ends of which are communicated with the main bore, which passes upwards to the surface, wherein the lower essentially cylindrical housing into the main bore to the position in which it adjoins the inner ends of the side wells, installed in the housing passages for the flow, which includes the entrance apertures adapted to align them with the inner ends of the side wells and for receiving the extracted fluid coming from these ends, and project through its rotation, done this way to position the inlet for receiving the stream of produced fluid coming from the inner ends of the side wells and conduct the flow of produced fluid from the side of the wells along the longitudinal channels.

24. The method according to p. 23, characterized in that regulate the flow of the extracted media passing through the passages for the flow.

25. The method according to p. 24, characterized in that track the characteristics of the produced fluid in each passage for the stream.

26. The method according to p. 23, characterized in that provide isolated sealed under pressure the message between the inner ends of the side wells and inlet holes.

 

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