Sand control and water control well completion pipe string and well completion method

Abstract

The invention provides a sand control and water control well completion pipe string. The sand control and water control well completion pipe string comprises a gravel packing sand control well completion pipe string and a water control well completion pipe string. The gravel packing sand control completion pipe string is configured to be tripped into a wellbore and comprises a screen pipe string, an outer guide device connected to the tail end of the screen pipe string, a gravel packing device connected to the head end of the screen pipe string, an outer suspension device connected to the gravel packing device and at least one outer packing device. The water control well completion pipe string is configured to be tripped into an inner cavity of the gravel packing sand control well completion pipe string after the gravel packing device is pulled out. The water control well completion pipe string comprises an oil extraction pipe string assembly, an inner guide device connected to the tail end of the oil extraction pipe string assembly, an inner suspension device connected to the head end of the oil extraction pipe string assembly, at least one inner packing device and a plurality of water control devices. The sand control and water control well completion pipe string is simple in structure and construction process, meanwhile, the segmented sand control well completion pipe string and the water control well completion pipe string can work independently, and the water control well completion pipe string can be pulled out, tripped again and the like according to needs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas well completion, and in particular relates to a sand control and water control well completion string, and also relates to a well completion method. Background Art

[0002] During the completion process of loose sandstone reservoirs, sand is easily produced, and gravel filling completion is required. In addition, if there is edge and bottom water near the reservoir, sand may be produced during the production period and the water content is too high, resulting in a short effective period of sand control, a short effective period of production, low recovery rate, bottom water cone advance and other problems.

[0003] The first solution of the existing technology is to use water control oil production pipe string. This process uses independent screen pipe completion, but its sand control effect is poor, the effective period is short, and it cannot achieve large-volume gravel packing. The second solution is to use gravel packing completion. This technology can achieve sand control for oil layers, but it cannot achieve flow control for edge and bottom water reservoirs. The water content of the oil well is high and the effective period of production is short.

[0004] The utility model patent entitled "Screen Completion Horizontal Well Water Control Production Pipe" with authorization announcement number CN 210134809 U mainly consists of casing, screen, hanging packer, rubber plug ring, water control pipe string, segmented packer, water control valve, screw plug, squeeze pipe string, squeeze colloid, squeeze segmented packer, squeeze valve and other components. The existing technology has the following main shortcomings: (1) The process cannot complete the well with gravel filling outside the pipe, resulting in a short effective period of sand control in the oil well and easy sand production. (2) The process uses a water control valve with poor flow capacity and cannot meet the demand for large-volume gravel filling.

[0005] The invention patent entitled "Horizontal Well Gravel Packing String and Pressure Control Valve Thereof" with authorization announcement number CN 103362483B mainly consists of oil pipes, oil drainers, flushing pipes, gravel packing tools, casings, screens, etc. The existing technology has the following main shortcomings: the process can only achieve sand control in oil wells, and cannot achieve flow control and water control for oil reservoirs with edge and bottom water, resulting in high water content in oil wells and short effective mining period.

[0006] Therefore, in view of the problem that segmented filling cannot realize segmented water control at the same time in the prior art gravel packing process, there is an urgent need for a completion string that can both prevent sand and realize water control. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention aims to provide a sand and water control completion string and a completion method.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention provides a sand control and water control completion string, comprising:

[0010] A gravel pack sand control completion string configured to be run into a wellbore and comprising:

[0011] Screen tube string;

[0012] an outer guide connected to an end of the screen string;

[0013] a gravel packing device connected to the head end of the screen string;

[0014] an external suspension device connected to the gravel packing device;

[0015] at least one external isolation device, which is spaced apart on the outer wall of the screen string and is used to isolate and segment the annulus between the gravel pack sand control completion string and the wellbore; and

[0016] A water control completion string is configured to be lowered into the inner cavity of the gravel pack sand control completion string after the gravel packing device is pulled out, and the water control completion string comprises:

[0017] Oil production pipe string components,

[0018] an inner guide device connected to the end of the production tubing string assembly;

[0019] An internal suspension device connected to the head end of the production tubing string assembly;

[0020] At least one inner isolation device, which is arranged at intervals on the outer wall of the oil production pipe string assembly, and the position of the inner isolation device corresponds to the position of the outer isolation device;

[0021] A plurality of water control devices are arranged at intervals on the oil production pipe string assembly, wherein one inner isolation device is respectively arranged between two of the water control devices.

[0022] Furthermore, the screen tube string includes a first screen tube, a second screen tube and a third screen tube which are connected in sequence.

[0023] Further, the at least one external isolation device comprises a first external isolation device and a second external isolation device, wherein:

[0024] The first external isolation device is arranged at the connection between the first screen pipe and the second screen pipe, and the second external isolation device is arranged at the connection between the second screen pipe and the third screen pipe.

[0025] Furthermore, the gravel packing device comprises a first casing string, a flow device and a drainage pipe device connected in sequence, wherein:

[0026] The flow-through device is connected to the first screen pipe, and the drainage pipe device is connected to the flow-through device and is disposed in the inner cavity of the gravel pack sand control completion string.

[0027] Furthermore, the external suspension device is connected to the flow-through device.

[0028] Furthermore, the external sealing device is a liquid-expanding sealing device.

[0029] Furthermore, the oil production pipe string assembly includes a first oil production pipe string, a second oil production pipe string, a third oil production pipe string, a fourth oil production pipe string, a fifth oil production pipe string and a sixth oil production pipe string which are connected in sequence.

[0030] Further, the at least one inner isolation device comprises a first inner isolation device and a second inner isolation device, wherein:

[0031] The first inner isolation device is disposed between the second oil production pipe string and the third oil production pipe string, and the second inner isolation device is disposed between the fourth oil production pipe string and the fifth oil production pipe string.

[0032] Further, the plurality of water control devices include a first water control device, a second water control device and a third water control device, wherein:

[0033] The first water control device is arranged between the first oil production pipe string and the second oil production pipe string, the second water control device is arranged between the third oil production pipe string and the fourth oil production pipe string, and the third water control device is arranged between the fifth oil production pipe string and the sixth oil production pipe string.

[0034] Furthermore, the water control completion string also includes a second casing string connected to the inner suspension device, and the inner suspension device is connected to the first production pipe string.

[0035] Furthermore, the inner sealing device is a hydraulic expansion packer.

[0036] The present invention also provides a well completion method for a sand and water control completion string, comprising the following steps:

[0037] S1, providing the sand and water control completion string mentioned above;

[0038] S2, lowering the gravel-packed sand control completion string into the wellbore;

[0039] S3, hanging and sealing the external hanging device on the wellbore pipe string connected to the wellbore;

[0040] S4, filling gravel into the annulus between the gravel filling sand control completion string and the wellbore through a gravel packing device to form a gravel packing layer;

[0041] S5, the external isolation device expands to the inner wall of the wellbore to isolate the annulus in sections;

[0042] S6, pull out the gravel packing device;

[0043] S7, lowering the water control completion string to a target position in the inner cavity of the gravel pack sand control completion string;

[0044] S8, causing the inner suspension device to be seated and expanded to the wellbore casing string connected to the wellbore;

[0045] S9, expand the inner isolation device to seal the inner wall of the gravel-packed sand control completion string.

[0046] Furthermore, the method further comprises the following steps:

[0047] S10, pull out the second casing string.

[0048] Compared with the prior art, the beneficial technical effects of the present invention are as follows: the present invention uses gravel-packed sand control completion strings and water control completion strings for completion at the same time, and isolates and segments the wellbore annulus through an external isolation device to form multiple sand control well sections, so that segmented gravel packing can be used, which effectively improves the gravel packing and sand control effect of horizontal wells. While implementing segmented sand control, the water control completion string is lowered to reduce the production pressure difference during oil and gas production, effectively control the edge and bottom water coning, reduce the water content of the produced fluid, improve the recovery rate, extend the production cycle of oil and gas wells, increase the output of oil wells, and achieve flow regulation and water control. Implementing the functions of segmented sand control and segmented water control is an effective measure to achieve refined completion and refined production of oil and gas wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0050] Figure 1 It is a structural schematic diagram of a gravel-packed sand control completion string of the sand control and water control completion string of the present invention;

[0051] Figure 2 It is a schematic structural diagram of a water control completion string of the sand control and water control completion string of the present invention;

[0052] Figure 3 It is a structural schematic diagram of the gravel packing sand control completion string of the present invention being lowered into the wellbore;

[0053] Figure 4 For Figure 3 Schematic diagram of the structure after the annulus is filled with gravel;

[0054] Figure 5 For the Figure 4 A schematic diagram of the structure after the first casing string and gravel packing device;

[0055] Figure 6 It is a structural schematic diagram of the water control completion string of the present invention being lowered into the inner cavity of the gravel pack sand control completion string;

[0056] Figure 7 For the Figure 6 Schematic diagram of the structure of the completion well retention after the second casing string. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0058] The present invention provides a sand control and water control completion string, including a gravel-packed sand control completion string (see Figure 1 ) and water control completion string (see Figure 2 ).

[0059] like Figure 1 and Figure 3 As shown, the gravel-packed sand control completion string is configured to be lowered into a wellbore 26, and comprises a screen string, an external guide device 12 connected to the end of the screen string, a gravel packing device connected to the head end of the screen string, an external suspension device 3 connected to the gravel packing device, and at least one external isolation device, which is arranged at intervals on the outer wall of the screen string to isolate the annulus 27 between the gravel-packed sand control completion string and the wellbore 26.

[0060] In a preferred embodiment, if Figure 1 As shown, the screen string includes a first screen 6, a second screen 8 and a third screen 11 connected in sequence by threads. At least one external isolation device includes a first external isolation device 7 and a second external isolation device 10, wherein the first external isolation device 7 is arranged at the connection between the first screen 6 and the second screen 8, and the second external isolation device 10 is arranged at the connection between the second screen 8 and the third screen 11. In a preferred embodiment, the first external isolation device 7 and the second external isolation device 10 are liquid-expanding isolation devices. When encountering liquid, the first external isolation device 7 and the second external isolation device 10 can achieve self-expansion, and they expand to the inner wall of the wellbore 26 respectively, isolate the wellbore 26 and divide it into three sections, and then divide the gravel packing layer 5 into three sections, forming three sections of sand control well sections, which is convenient for later staged water control. The external isolation device is an existing structure and will not be repeated here. In other embodiments, the screen string may include more or fewer screens as needed.

[0061] In a preferred embodiment, if Figure 1 As shown, the gravel packing device includes a first casing string 1, a flow device 4 and a drainage pipe device 9 which are connected in sequence. The flow device 4 is connected to the first screen 6, and the drainage pipe device 9 is connected to the flow device 4 and is arranged in the inner cavity of the gravel-packed sand control completion string. Gravel is filled into the annulus 27 by the gravel packing device. After the gravel is filled, the gravel packing device needs to be pulled out so that the water control completion string can be lowered into the inner cavity of the gravel-packed sand control completion string. In a preferred embodiment, the external suspension device 3 is connected to the flow device 4 by a thread. The external suspension device 3 has a slip and a rubber tube, and can be effectively hung on the wellbore casing string 2 connected to the wellbore 26 after hanging and expanding. (See FIG. 2 .) Figure 5-7 ) to ensure the sealing performance between the external suspension device 3 and the wellbore casing string 2. It should be understood by those skilled in the art that, for example, the wellhead pressure method can be adopted to complete the seating and expansion of the external suspension device 3. Further, the gravel packing device (including the flow device 4 and the drainage pipe device 9) and the external suspension device 3 are existing structures, and the seating method and gravel packing method of the external suspension device 3 are also existing methods, which will not be repeated here.

[0062] like Figure 2 As shown, the water control completion string is configured to be after the gravel packing device is pulled out (see Figure 5 ) is lowered into the inner cavity of the gravel-packed sand control completion string (see Figure 6 ). The water control completion string includes an oil production tubing string assembly, an inner guide device 24 connected to the end of the oil production tubing string assembly, an inner suspension device 13 connected to the head end of the oil production tubing string assembly, at least one inner isolation device and a plurality of water control devices. At least one inner isolation device is arranged at intervals on the outer wall of the oil production tubing string assembly, and the position of the inner isolation device corresponds to the position of the outer isolation device. The water control devices are arranged at intervals on the oil production tubing string assembly, wherein one inner isolation device is arranged between each of the two water control devices.

[0063] In a preferred embodiment, if Figure 2As shown, the production tube string assembly includes a first production tube string 14, a second production tube string 16, a third production tube string 18, a fourth production tube string 20, a fifth production tube string 22 and a sixth production tube string 28 which are sequentially connected by threads. At least one inner isolation device includes a first inner isolation device 17 and a second inner isolation device 21. The first inner isolation device 17 is arranged between the second production tube string 16 and the third production tube string 18, and the second inner isolation device 21 is arranged between the fourth production tube string 20 and the fifth production tube string 22. In a preferred embodiment, the first inner isolation device 17 and the second inner isolation device 21 are hydraulic expansion packers. After the water control completion string is lowered into the wellbore, the expansion positions of the first inner isolation device 17 and the second inner isolation device 21 correspond to the positions of the first outer isolation device 7 and the second outer isolation device 10, respectively (see Figure 6 ), ensuring the sealing performance at the corresponding position. It should be understood by those skilled in the art that, for example, the first inner isolation device 17 and the second inner isolation device 21 can be expanded and sealed by wellhead pressure. The structure of the inner isolation device and the expansion and sealing method are prior art and will not be described in detail here.

[0064] In a preferred embodiment, if Figure 2 As shown, the plurality of water control devices include a first water control device 15, a second water control device 19 and a third water control device 23. The first water control device 15 is arranged between the first oil production pipe string 14 and the second oil production pipe string 16, the second water control device 19 is arranged between the third oil production pipe string 18 and the fourth oil production pipe string 20, and the third water control device 23 is arranged between the fifth oil production pipe string 22 and the sixth oil production pipe string 28. The structure of the water control device and the water control method are prior art and will not be described in detail here.

[0065] like Figure 2 As shown, the water control completion string also includes a second casing string 29 connected to the inner suspension device 13 through a thread, and the inner suspension device 13 is connected to the first production pipe string 14. The inner suspension device 13 has slips and rubber tubes, and can be effectively hung on the wellbore casing string 2 connected to the wellbore 26 after hanging and expanding. Figure 7 ) to ensure the sealing performance between the inner suspension device 13 and the wellbore casing string 2. It should be understood by those skilled in the art that, for example, the wellhead pressure method can be adopted to complete the sitting and expansion of the inner suspension device 13. The structure and sitting method of the inner suspension device 13 are prior art and will not be described in detail here.

[0066] The present invention also provides a completion method for a sand control and water control completion string, such as Figure 1-7 As shown, the following steps are included:

[0067] S1, providing a sand control and water control completion string having a gravel-packed sand control completion string and a water control completion string;

[0068] S2, lowering the gravel-packed sand control completion string into the wellbore 26;

[0069] S3, the external suspension device 3 is suspended and sealed on the wellbore casing string 2 connected to the wellbore 26 by wellhead pressure.

[0070] S4, gravel is filled into the annulus 27 between the gravel filling sand control completion string and the wellbore 26 by a gravel packing device to form a gravel packing layer 5 ( Figure 4 );

[0071] S5, the external isolation device expands to the inner wall of the wellbore 26 when encountering liquid in the wellbore 26, isolating the annulus 27 in sections ( Figure 5 );

[0072] S6, the external suspension device 3 is released by wellhead liquid pressure, and the first casing string 1 and the gravel packing device are pulled out to form a horizontal section filling segmented construction string, such as Figure 5 As shown, three stages of gravel packing layers 5 are formed;

[0073] S7, lowering the water control completion string to the target position in the inner cavity of the gravel pack sand control completion string ( Figure 6 );

[0074] S8, by taking a wellhead pressure method, the inner suspension device is set and expanded to the wellbore casing string 2 connected to the wellbore 26;

[0075] S9, expanding and sealing the inner isolation device to the inner wall of the gravel-packed sand control completion string by wellhead pressure-pressing;

[0076] S10, completing the release action of the inner suspension device 13 by wellhead pressure, and pulling out the second casing string 29.

[0077] According to the above method, a completion string that can realize integrated segmented sand control and segmented water control in the upper, middle and lower sections is finally left in the wellbore 26, such as Figure 7 The well completion string structure shown in the figure. In the case of water cone in the side and bottom and rising water content, the first water control device 15, the second water control device 19 and the third water control device 23 can be adjusted and controlled to achieve segmented water control mining, extend the low water content mining cycle, and thus achieve energy conservation and emission reduction. In the later stage, the water control completion string can be pulled out and re-entered as needed.

[0078] The sand-control and water-control completion string of the present invention can ensure the effect of sand-control completion gravel filling segmentation in oil and gas wells, and at the same time achieve the effect of fine water control, exploitation, reducing construction risks, and ensuring subsequent water control in the later stage. The sand-control and water-control completion string of the present invention has a simple structure and a simple construction process, which ensures the smooth implementation of the operation and construction safety. At the same time, the segmented sand-control completion string and the water-control completion string can work independently, and the water-control completion string can be pulled out and re-entered as needed. The process is continuous, the construction period is short, it has good economic and social benefits, and has broad application prospects.

[0079] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present disclosure or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. "Multiple" means two or more, unless otherwise clearly and specifically limited.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present disclosure; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. For example, the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", "lateral", "longitudinal", "vertical" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0081] In the specification and claims of the present invention and the above-mentioned drawings, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0082] It should be particularly pointed out that the various components or steps in the above-mentioned embodiments can be cross-linked, replaced, added, or deleted with each other. Therefore, the combinations formed by these reasonable arrangements and combinations should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should not be limited to the embodiments.

[0083] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A sand control and water control completion string, characterized in that: include: A gravel pack sand control completion string configured to be run into a wellbore and comprising: Screen tube string; an outer guide connected to an end of the screen string; a gravel packing device connected to the head end of the screen string; an external suspension device connected to the gravel packing device; at least one external isolation device, which is spaced apart on the outer wall of the screen string and is used to isolate and segment the annulus between the gravel pack sand control completion string and the wellbore; and A water control completion string is configured to be lowered into the inner cavity of the gravel pack sand control completion string after the gravel packing device is pulled out, and the water control completion string comprises: Oil production pipe string components, an inner guide device connected to the end of the production tubing string assembly; An internal suspension device connected to the head end of the production tubing string assembly; At least one inner isolation device, which is arranged at intervals on the outer wall of the oil production pipe string assembly, and the position of the inner isolation device corresponds to the position of the outer isolation device; A plurality of water control devices are arranged at intervals on the oil production pipe string assembly, wherein one inner isolation device is respectively arranged between two of the water control devices.

2. The sand and water control completion string according to claim 1, characterized in that: The screen tube string comprises a first screen tube, a second screen tube and a third screen tube which are connected in sequence.

3. The sand and water control completion string according to claim 2, characterized in that: The at least one external isolation device comprises a first external isolation device and a second external isolation device, wherein: The first external isolation device is arranged at the connection between the first screen pipe and the second screen pipe, and the second external isolation device is arranged at the connection between the second screen pipe and the third screen pipe.

4. The sand and water control completion string according to claim 2, characterized in that: The gravel packing device comprises a first casing string, a flow device and a drainage pipe device connected in sequence, wherein: The flow-through device is connected to the first screen pipe, and the drainage pipe device is connected to the flow-through device and is disposed in the inner cavity of the gravel pack sand control completion string.

5. The sand and water control completion string according to claim 4, characterized in that: The outer suspension device is connected to the flow-through device.

6. The sand and water control completion string according to claim 2, characterized in that: The external isolation device is a liquid-expanding isolation device.

7. The sand and water control completion string according to claim 1, characterized in that: The oil production pipe string assembly comprises a first oil production pipe string, a second oil production pipe string, a third oil production pipe string, a fourth oil production pipe string, a fifth oil production pipe string and a sixth oil production pipe string which are connected in sequence.

8. The sand and water control completion string according to claim 7, characterized in that: The at least one inner isolation device comprises a first inner isolation device and a second inner isolation device, wherein: The first inner isolation device is disposed between the second oil production pipe string and the third oil production pipe string, and the second inner isolation device is disposed between the fourth oil production pipe string and the fifth oil production pipe string.

9. The sand and water control completion string according to claim 7, characterized in that: The plurality of water control devices include a first water control device, a second water control device and a third water control device, wherein: The first water control device is arranged between the first oil production pipe string and the second oil production pipe string, the second water control device is arranged between the third oil production pipe string and the fourth oil production pipe string, and the third water control device is arranged between the fifth oil production pipe string and the sixth oil production pipe string.

10. The sand and water control completion string according to claim 7, characterized in that: The water control completion string further includes a second casing string connected to the inner suspension device, and the inner suspension device is connected to the first production pipe string.

11. The sand and water control completion string according to claim 1, characterized in that: The inner sealing device is a hydraulic expansion packer.

12. A completion method for a sand and water control completion string, characterized in that: The following steps are involved: S1, providing a sand and water control completion string according to any one of claims 1 to 11; S2, lowering the gravel-packed sand control completion string into the wellbore; S3, hanging and sealing the external hanging device on the wellbore pipe string connected to the wellbore; S4, filling gravel into the annulus between the gravel filling sand control completion string and the wellbore through a gravel packing device to form a gravel packing layer; S5, the external isolation device expands to the inner wall of the wellbore to isolate the annulus in sections; S6, pull out the gravel packing device; S7, lowering the water control completion string to a target position in the inner cavity of the gravel pack sand control completion string; S8, causing the inner suspension device to be seated and expanded to the wellbore casing string connected to the wellbore; S9, expand the inner isolation device to seal the inner wall of the gravel-packed sand control completion string.

13. The well completion method of the sand and water control completion string according to claim 12, characterized in that: The following steps are also included: S10, pull out the second casing string.

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