Control system for horizontal well group multi-medium production

Abstract

The utility model discloses a control system for multi-medium production of a horizontal well group, which belongs to the technical field of horizontal well group production, and is characterized in that short-term groove building (a qualified target is built for horizontal well butt joint) is carried out after drilling of a vertical well in the first period, and a medium is introduced from an inlet end of the vertical well in a key groove stage through a water inlet header pipe according to actual requirements; then the medium flows into a water outlet header pipe through the outlet end of the keyway stage vertical well, and the medium is conveyed to a wastewater header pipe; after the horizontal wells are butted and drilled, the horizontal wells enter a pilot production stage and gradually form designed production capacity (one vertical well and one horizontal well form one well group), and a medium is introduced from the vertical wells through the water inlet main pipe according to actual requirements, then flows into the water outlet main pipe through the horizontal wells and flows into the branch pipes according to actual conditions. According to the utility model, the accurate control production under various conditions can be achieved, and the brine extraction process of the horizontal well group for rock salt mine development is perfected, so that the organization production allocation problem of different well groups and different water qualities is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of horizontal well group production, and in particular relates to a control system for multi-media production of a horizontal well group. Background Art

[0002] Well salt development and production enterprises not only have to undertake the recovery and treatment of the desalinated water after the full brine alkali production process, but also have to deal with other miscellaneous water (production wastewater, domestic wastewater, rainwater) generated in the production process. Therefore, water injection wells are formed in different areas. The water quality of the injection wells should be treated differently according to the actual production years of the brine wells and the conditions of the brine well dissolution cavity. This has led to the need to classify various water injection wells, which are specifically divided into the following six situations;

[0003] 1) In order to meet the needs of horizontal well docking targets, newly drilled vertical wells need to use pure white water to build grooves for a period of time.

[0004] 2) After the docking is completed, the new well group uses 20% of the light salt water, and 80% of the white water is injected into the well for small-volume production, that is, the ratio of white water to light salt water is 8:2.

[0005] 3) Brine wells with a long production time have a certain amount of cross-over in the rock top plate, and a small amount of black brine and hydrogen sulfide (H2S) penetrate into the brine in the stratum. The brine is weakly acidic due to hydrogen sulfide. Since hydrogen sulfide is an acidic medium, the pH value of the recovered brine reaches about 11-12, which is strongly alkaline. In order to neutralize hydrogen sulfide, such brine wells need to be fully injected with brine, so as to achieve chemical treatment of hydrogen sulfide (H2S) underground to reduce the impact on equipment and pipelines. The ratio of white water to brine is 2:8 or all brine is used for well injection.

[0006] 4) After the new well group has formed a certain production capacity, the medium of the injection well is mixed water, white water, and light salt water in a ratio of 1:2:7.

[0007] 5) When repairing pipelines or removing crystals from brine wells, the wells must be flushed with white water.

[0008] At present, the horizontal drilling technology used in well salt mining and drilling is widely used in the oil sector. It is a drilling process that has been widely used in recent years. The original mines all adopted vertical well convection and naturally connected wells after the expansion of the dissolution cavity for production. When new mines are built, horizontal drilling technology is used to form horizontal well groups for production. There are very few salt mines that recycle the light brine produced by chemical caustic soda enterprises. According to the existing actual production situation, a control system for multi-media production of horizontal well groups is specially designed. Utility Model Content

[0009] The purpose of the utility model is to solve the problems of the prior art and provide a control system for multi-media production of a horizontal well group. After the first phase of vertical wells are drilled, short-term slot construction is carried out (to establish qualified targets for horizontal well docking). The medium is introduced from the inlet end of the vertical well in the key slot stage through the water inlet main pipe according to actual needs, and then flows into the water outlet main pipe through the outlet end of the vertical well in the key slot stage, and the medium is sent to the wastewater main pipe; after the horizontal wells are drilled, they enter the trial production stage and gradually form the designed production capacity (a vertical well and a horizontal well form a well group), and the medium is introduced from the vertical well through the water inlet main pipe according to actual needs, and then flows into the water outlet main pipe through the horizontal well, and flows into the branch pipe according to actual conditions. The utility model can achieve precise control of production under various conditions, improve the brine extraction process of the horizontal well group in the development of rock salt mines, and thus solve the problem of organizing production and allocation of different well groups and different water qualities.

[0010] The utility model is realized by the following technical solutions:

[0011] A control system for multi-media production of a horizontal well group, comprising a water inlet main pipe, a water outlet main pipe and a DCS controller, wherein the water inlet main pipe is connected to the inlet end of a keyway stage vertical well and the vertical well, the water inlet main pipe is connected to a fresh water main pipe, a first control valve is arranged on the fresh water main pipe, the water inlet main pipe is connected to a miscellaneous water main pipe, a second control valve is arranged on the miscellaneous water main pipe, the water inlet main pipe is connected to a white water main pipe, a third control valve is arranged on the white water main pipe, and the water outlet main pipe is connected to the outlet end of the keyway stage vertical well. The outlet end is connected to the horizontal well, the outlet main pipe is connected to the first brine collecting pipe, the first brine collecting pipe is provided with a fourth control valve, the outlet main pipe is connected to the second brine collecting pipe, the second brine collecting pipe is provided with a fifth control valve, the outlet main pipe is connected to the wastewater main pipe, the wastewater main pipe is provided with a sixth control valve, the vertical well and the horizontal well are connected, and the DCS controller is connected to the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve.

[0012] Preferably, a first flow meter is also provided on the fresh water main, and the first flow meter is connected to the DCS controller.

[0013] Preferably, a second flow meter is also provided on the miscellaneous water main pipe, and the second flow meter is connected to the DCS controller.

[0014] Preferably, a third flow meter is also provided on the white water main pipe, and the third flow meter is connected to the DCS controller.

[0015] Preferably, a fourth flow meter is provided on the water outlet main pipe, and the fourth flow meter is connected to the DCS controller.

[0016] Preferably, a seventh control valve is provided on the water inlet main pipe, and the seventh control valve is connected to the DCS controller.

[0017] Preferably, an eighth control valve is provided on the water outlet main pipe, and the eighth control valve is connected to the DCS controller.

[0018] Preferably, a first sampling valve is provided on the water inlet main pipe; and a second sampling valve is provided on the water outlet main pipe.

[0019] Preferably, the water inlet main pipe is provided with a first pressure gauge and a second pressure gauge, and the first pressure gauge and the second pressure gauge are connected to a DCS controller.

[0020] Preferably, a third pressure gauge and a fourth pressure gauge are provided on the water outlet main pipe, and the third pressure gauge and the fourth pressure gauge are connected to the DCS controller.

[0021] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0022] 1. The utility model provides a control system for multi-media production of horizontal well groups. After the first phase of vertical wells are drilled, short-term slot construction is carried out (to establish qualified targets for horizontal well docking). The medium is introduced from the inlet end of the vertical well in the key slot stage through the water inlet main pipe according to actual needs, and then flows into the water outlet main pipe through the outlet end of the vertical well in the key slot stage, and the medium is sent to the wastewater main pipe; after the horizontal wells are drilled, they enter the trial production stage and gradually form the designed production capacity (a vertical well and a horizontal well form a well group). The medium is introduced from the vertical well through the water inlet main pipe according to actual needs, and then flows into the water outlet main pipe through the horizontal well, and flows into the branch pipe according to actual conditions. The utility model can achieve precise control of production under various conditions, improve the brine extraction process of the horizontal well group in the development of rock salt mines, and thus solve the problem of organizing production and allocation of different well groups and different water qualities.

[0023] 2. The utility model provides a control system for multi-media production of a horizontal well group, wherein the first flow meter, the second flow meter, the third flow meter and the fourth flow meter are arranged to display the flow of the first branch pipe, the second branch pipe, the third branch pipe and the water outlet main pipe in real time.

[0024] 3. The utility model provides a control system for multi-media production of a horizontal well group. The arrangement of the first sampling valve and the second sampling valve facilitates sampling of the media in the water inlet main pipe and the water outlet main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Among them: 1. water inlet main pipe; 2. water outlet main pipe; 3. keyway stage vertical well; 4. vertical well; 5. fresh water main pipe; 6. first control valve; 7. miscellaneous water main pipe; 8. second control valve; 9. white water main pipe; 10. third control valve; 11. horizontal well; 12. first brine collection pipe; 13. fourth control valve; 14. second brine collection pipe; 15. fifth control valve; 16. waste water main pipe; 17. sixth control valve; 18. first flow meter; 19. second flow meter; 20. third flow meter; 21. fourth flow meter; 22. seventh control valve; 23. eighth control valve; 24. first sampling valve; 25. second sampling valve; 26. first pressure gauge; 27. second pressure gauge; 28. third pressure gauge; 29. ​​fourth pressure gauge. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the embodiments, but the implementation manner of the present invention is not limited thereto.

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides a control system for multi-media production of a horizontal well group, including a water inlet main pipe 1, a water outlet main pipe 2 and a DCS controller, wherein the water inlet main pipe 1 is connected to the inlet end of the keyway stage vertical well 3 and the vertical well 4, the water inlet main pipe 1 is connected to the fresh water main pipe 5, the fresh water main pipe 5 is provided with a first control valve 6, the water inlet main pipe 1 is connected to the miscellaneous water main pipe 7, the miscellaneous water main pipe 7 is provided with a second control valve 8, the water inlet main pipe 1 is connected to the white water main pipe 9, the white water main pipe 9 is provided with a third control valve 10, the water outlet main pipe 2 is connected to the outlet end of the keyway stage vertical well 3 and The horizontal well 11 is connected, the outlet main pipe 2 is connected to the first brine receiving pipe 12, the first brine receiving pipe 12 is provided with a fourth control valve 13, the outlet main pipe 2 is connected to the second brine receiving pipe 14, the second brine receiving pipe 14 is provided with a fifth control valve 15, the outlet main pipe 2 is connected to the wastewater main pipe 16, the wastewater main pipe 16 is provided with a sixth control valve 17, the vertical well 4 is connected to the horizontal well 11, and the DCS controller is connected to the first control valve 6, the second control valve 8, the third control valve 10, the fourth control valve 13, the fifth control valve 15 and the sixth control valve 17.

[0030] Example 2

[0031] The difference between this embodiment and embodiment 1 is that, preferably, a first flow meter 18 is further provided on the fresh water main pipe 5, and the first flow meter 18 is connected to the DCS controller.

[0032] The miscellaneous water main pipe 7 is also provided with a second flow meter 19, and the second flow meter 19 is connected to the DCS controller.

[0033] Wherein, a third flow meter 20 is also arranged on the white water main pipe 9, and the third flow meter 20 is connected to the DCS controller.

[0034] Wherein, a fourth flow meter 21 is provided on the water outlet main pipe 2, and the fourth flow meter 21 is connected to the DCS controller.

[0035] Wherein, a seventh control valve 22 is provided on the water inlet main pipe 1, and the seventh control valve 22 is connected to the DCS controller.

[0036] Wherein, an eighth control valve 23 is provided on the water outlet main pipe 2, and the eighth control valve 23 is connected to the DCS controller.

[0037] Wherein, the water inlet main pipe 1 is provided with a first sampling valve 24 ; the water outlet main pipe 2 is provided with a second sampling valve 25 .

[0038] The water inlet main pipe 1 is provided with a first pressure gauge 26 and a second pressure gauge 27 , and the first pressure gauge 26 and the second pressure gauge 27 are connected to the DCS controller.

[0039] The water outlet main pipe 2 is provided with a third pressure gauge 28 and a fourth pressure gauge 29, and the third pressure gauge 28 and the fourth pressure gauge 29 are connected to the DCS controller.

[0040] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0041] 1. The utility model provides a control system for multi-media production of 11 groups of horizontal wells. After the first phase of vertical well 4 is drilled, a short-term slot is built (a qualified target is established for the docking of horizontal well 11). The medium is introduced from the inlet end of the vertical well 3 in the key slot stage through the water inlet main pipe 1 according to actual needs, and then flows into the water outlet main pipe 2 through the outlet end of the vertical well 3 in the key slot stage, and the medium is sent to the wastewater main pipe 16; after the horizontal well 11 is drilled, it enters the trial production stage and gradually forms the designed production capacity (a vertical well 4 and a horizontal well 11 form a well group), and the medium is introduced from the vertical well 4 through the water inlet main pipe 1 according to actual needs, and then flows into the water outlet main pipe 2 through the horizontal well 11, and flows into the branch pipe according to actual conditions. The utility model can achieve precise control of production under various conditions, improve the brine extraction process of 11 groups of horizontal wells in rock salt mine development, and thus solve the problem of organizing production and allocation of different well groups and different water qualities.

[0042] 2. The utility model provides a control system for the production of 11 groups of multi-media in horizontal wells. The first flow meter 18, the second flow meter 19, the third flow meter 20 and the fourth flow meter 21 are set to display the flow of the first branch pipe, the second branch pipe, the third branch pipe and the water outlet main pipe 2 in real time.

[0043] 3. The utility model provides a control system for multi-media production of 11 groups of horizontal wells. The arrangement of the first sampling valve 24 and the second sampling valve 25 facilitates sampling of the media in the water inlet main pipe 1 and the water outlet main pipe 2.

[0044] Example 3

[0045] The difference between this embodiment and embodiment 2 is that the diameter of the water inlet main pipe 1 is DN150, the diameter of the water outlet main pipe 2 is DN150; the diameters of the fresh water main pipe 5, the mixed water main pipe 7, the white water main pipe 9, the first brine collection pipe 12, the second brine collection pipe 14 and the wastewater main pipe 16 are all DN10.

[0046] In Example 1 to Example 3, the white water main pipe 9 is connected to the white water injection pump, the fresh water main pipe 5 is connected to the fresh water injection pump, the miscellaneous water main pipe 7 is connected to the miscellaneous water injection pump, and the quality requirements of the high-quality brine in the first brine collecting main pipe 12 are: salt content of sodium chloride ≥290g / l, calcium ion ≤2.0g / l, magnesium ion ≤0.6g / l, sulfate ion ≤5.0g / l, total ammonium ≤10mg / l; the wastewater main pipe 22 is connected to the collection tank.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A control system for multi-media production of a horizontal well group, characterized by: The invention comprises a water inlet main pipe (1), a water outlet main pipe (2) and a DCS controller, wherein the water inlet main pipe (1) is connected to the inlet end of the keyway stage vertical well (3) and the vertical well (4), the water inlet main pipe (1) is connected to the fresh water main pipe (5), the fresh water main pipe (5) is provided with a first control valve (6), the water inlet main pipe (1) is connected to the miscellaneous water main pipe (7), the miscellaneous water main pipe (7) is provided with a second control valve (8), the water inlet main pipe (1) is connected to the white water main pipe (9), the white water main pipe (9) is provided with a third control valve (10), the water outlet main pipe (2) is connected to the outlet end of the keyway stage vertical well (3) and the horizontal well (11), and the water outlet main pipe (1) is connected to the horizontal well (11). (2) is connected to a first brine collecting pipe (12), a fourth control valve (13) is arranged on the first brine collecting pipe (12), the outlet main pipe (2) is connected to a second brine collecting pipe (14), a fifth control valve (15) is arranged on the second brine collecting pipe (14), the outlet main pipe (2) is connected to a wastewater main pipe (16), a sixth control valve (17) is arranged on the wastewater main pipe (16), the vertical well (4) and the horizontal well (11) are connected, and the DCS controller is connected to the first control valve (6), the second control valve (8), the third control valve (10), the fourth control valve (13), the fifth control valve (15) and the sixth control valve (17).

2. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The fresh water main pipe (5) is also provided with a first flow meter (18), and the first flow meter (18) is connected to the DCS controller.

3. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The miscellaneous water main pipe (7) is also provided with a second flow meter (19), and the second flow meter (19) is connected to the DCS controller.

4. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The white water main pipe (9) is also provided with a third flow meter (20), and the third flow meter (20) is connected to the DCS controller.

5. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The water outlet main pipe (2) is provided with a fourth flow meter (21), and the fourth flow meter (21) is connected to a DCS controller.

6. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The water inlet main pipe (1) is provided with a seventh control valve (22), and the seventh control valve (22) is connected to a DCS controller.

7. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: An eighth control valve (23) is provided on the water outlet main pipe (2), and the eighth control valve (23) is connected to a DCS controller.

8. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The water inlet main pipe (1) is provided with a first sampling valve (24); the water outlet main pipe (2) is provided with a second sampling valve (25).

9. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The water inlet main pipe (1) is provided with a first pressure gauge (26) and a second pressure gauge (27), and the first pressure gauge (26) and the second pressure gauge (27) are connected to a DCS controller.

10. A control system for multi-media production of a horizontal well group according to claim 1, characterized in that: The water outlet main pipe (2) is provided with a third pressure gauge (28) and a fourth pressure gauge (29), and the third pressure gauge (28) and the fourth pressure gauge (29) are connected to a DCS controller.

Images