Sealing, well spacing and sand filling simulator

Abstract

The utility model relates to the technical field of vertical well steam huff and puff physical model experiments, in particular to a sealing, well spacing and sand filling simulator. The sealing, well spacing and sand filling simulator comprises a base, a rotatable model box is installed on the base, the model box is covered with a box cover, a plurality of galvanic couple distribution rods which are evenly distributed are fixedly installed in the model box, two vertical wells which are symmetrically distributed are distributed on the two sides of an inner cavity of the model box, and the two vertical wells are communicated with the box cover. An inlet and an outlet of the vertical well extend out of the model box, and a liquid injection well hole, an oil injection well hole and a vacuum connector are formed in the bottom of the model box. The sealing, well spacing and sand filling simulator provided by the utility model can be used for well carrying out a vertical well huff and puff experiment, determining the multi-round huff and puff steam wave and range change and section use mode rule under the condition of composite rhythm multi-layer system steam huff and puff, and determining the dynamic change characteristics of vertical well steam huff and puff production under the condition of composite rhythm.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical well steam throughput simulation experiments, in particular to a sealing, well layout and sand filling simulator. Background Art

[0002] During the steam stimulation of vertical wells, physical simulation experiments are mainly used to characterize the distinctive features of vertical reservoir production. However, for the three-dimensional physical model, there are only three layers of longitudinal thermocouples, which makes it difficult to accurately describe the production conditions at different vertical heights. In order to accurately characterize the longitudinal heterogeneity and the differential development characteristics of the steam chamber in this case, a large-scale two-dimensional proportional model with a pseudo-three-dimensional structure is placed vertically, and the longitudinal thermocouple temperature measurement reaches 8 layers, which can achieve high-precision identification of the distinctive features of vertical production.

[0003] Therefore, it is necessary to provide a new sealing, well layout and sand filling simulator to solve the above technical problems. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a sealing, well layout and sand filling simulator.

[0005] The sealing, well layout and sand filling simulator provided by the utility model comprises a base, a rotatable model box is installed on the base, and a box cover is provided on the upper cover of the model box;

[0006] Among them, a plurality of evenly distributed electric couple distribution rods are fixedly installed in the model box, and two symmetrically distributed vertical wells are distributed on both sides of the inner cavity of the model box, and the inlet and outlet of the vertical wells extend out of the model box respectively, and the bottom of the model box is provided with a liquid injection wellbore, an oil injection wellbore and a vacuum interface;

[0007] Wherein, the box cover is provided with a top wellbore and a threaded sand filling pipe is fixedly installed, and a threaded piston column cover is inserted into the threaded sand filling pipe.

[0008] Preferably, three injection wellbores are provided, and solenoid valves are installed on the injection wellbores, the oil injection wellbores, the vacuum interface and the top wellbores.

[0009] Preferably, a pressure gauge for detecting the vacuum degree in the model box is also installed at the bottom of the model box.

[0010] Preferably, a knob is provided on the top of the piston column cover, and an external thread is provided on the root of the piston column cover.

[0011] Preferably, the model box is provided with a plurality of evenly distributed butt screw holes A, and the box cover is provided with a plurality of evenly distributed butt screw holes B.

[0012] Preferably, two symmetrically distributed brackets are fixedly mounted on the base, and a ring is fixedly mounted on each of the brackets, a threaded fastening screw is inserted into the ring, and rotating shafts are fixedly mounted on the outer walls on both sides of the base, and the two rotating shafts are respectively inserted into the two rings and rotatably connected to the rings.

[0013] Preferably, a plurality of locking universal wheels are installed at the bottom of the base.

[0014] Compared with the related art, the sealing, well layout and sand filling simulator provided by the utility model has the following beneficial effects:

[0015] The utility model can well carry out vertical well huff and puff experiments, clarify the changes in the range of steam waves and the profile utilization pattern of multiple rounds of huff and puff under the conditions of composite rhythmic multi-layer steam huff and puff, and determine the dynamic change characteristics of vertical well steam huff and puff production under composite rhythmic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of a preferred embodiment of a sealing, well layout and sand filling simulator provided by the utility model;

[0017] Figure 2 for Figure 1 The schematic diagram of the structure of the model box and the box cover being separated;

[0018] Figure 3 for Figure 2 The structural schematic diagram of the model box shown;

[0019] Figure 4 for Figure 3 Schematic diagram of the structure of the bottom of the model box shown.

[0020] Numbers in the figure: 1. base; 11. bracket; 12. collar; 13. fastening screw; 14. locking universal wheel; 2. model box; 2a. docking screw hole A; 21. rotating shaft; 3. box cover; 3a. docking screw hole B; 31. threaded sand filling pipe; 32. piston column cover; 4. electric couple distribution rod; 5. vertical well; 6. liquid injection wellbore; 7. oil injection wellbore; 8. vacuum interface; 81. pressure gauge; 9. top wellbore. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0023] See also Figures 1 to 4 An embodiment of the utility model provides a sealing, well layout and sand filling simulator, which includes a base 1, a model box 2 and a box cover 3.

[0024] In the embodiments of the present invention, please refer to Figures 1 to 4 A rotatable model box 2 is installed on the base 1, specifically, two symmetrically distributed brackets 11 are fixedly installed on the base 1, and each of the brackets 11 is fixedly installed with a ring 12, and a threaded fastening screw 13 is inserted on the ring 12, and a rotating shaft 21 is fixedly installed on the outer walls of both sides of the base 1, and the two rotating shafts 21 are respectively inserted into the two rings 12 and rotatably connected with the rings 12, and a plurality of evenly distributed docking screw holes A2a are opened on the model box 2, and a plurality of evenly distributed docking screw holes B3a are opened on the box cover 3.

[0025] It should be noted that when the model box 2 is to be turned over, the fastening screw 13 is loosened and the model box 2 is rotated to a suitable position and then the fastening screw 13 is tightened, and the box cover 3 is fixedly installed on the model box 2 by passing the bolts through the docking screw holes B3a and the docking screw holes A2a;

[0026] A plurality of locking universal wheels 14 are installed at the bottom of the base 1 to facilitate the transfer of the model box 2 .

[0027] In the embodiments of the present invention, please refer to Figures 1 to 4 A plurality of evenly distributed electric couple distribution rods 4 are fixedly installed in the model box 2, and two symmetrically distributed vertical wells 5 are distributed on both sides of the inner cavity of the model box 2, and the inlet and outlet of the vertical well 5 extend out of the model box 2 respectively. A liquid injection wellbore 6, an oil injection wellbore 7 and a vacuum interface 8 are arranged at the bottom of the model box 2. A pressure gauge 81 for detecting the vacuum degree in the model box 2 is also installed at the bottom of the model box 2. A top wellbore 9 and a threaded sand filling pipe 31 are fixedly installed on the box cover 3, and a threaded piston column cover 32 is inserted on the threaded sand filling pipe 31, and a knob is arranged on the top of the piston column cover 32, and an external thread is arranged at the root of the piston column cover 32, and three liquid injection wellbores 6 are arranged, and solenoid valves are installed on the liquid injection wellbore 6, the oil injection wellbore 7, the vacuum interface 8 and the top wellbore 9.

[0028] It should be noted that the specific experimental steps are as follows:

[0029] (1) Model sand filling: quartz sand of 20-50 mesh is filled according to the actual particle size, and sand is filled according to eight layers of different particle sizes in the profile. A layer of thermocouple can be set on the thermocouple distribution rod 4 for each layer of sand filled, so that the longitudinal profile can be accurately monitored. Finally, after filling through the threaded sand filling pipe 31, the piston column cover 32 is inserted into the threaded sand filling pipe 31 for compaction;

[0030] (2) Vacuuming: Connect the vacuum pump to the vacuum port 8 and start suction. At this time, close other solenoid valves and continue to pump for 10 minutes until the vacuum degree reaches 1 KPa;

[0031] (3) Leak detection + saturated water: turn the model box 2 over to make it tilted, and inject saturated distilled water from the three injection wells 6 at the bottom. During the saturation process, the threaded sand filling pipe 31 is used to fill the sand again, and then the piston column cover 32 is used to compact the sand.

[0032] (4) Oil saturation: The temperature of the model box 2 and the oil is raised to 80°C, and the oil is injected from the bottom injection well 7 at a rate of 50-100 ml / min, and the top well 9 is produced until pure oil is exported. The process continues for 10 minutes. After saturation, the temperature of the model box 2 is lowered to room temperature and aged for 48 hours.

[0033] (5) Steam injection: two vertical wells 5 are injected simultaneously or asynchronously, with a maximum rate limit of 25 ml / min and a maximum pressure limit of 8 MPa;

[0034] (6) Steam huff and puff well soaking: The soaking time is 3-5 minutes. The subsequent rounds of steam huff and puff time are adjusted according to the first round of steam huff and puff conditions.

[0035] (7) Steam huff and puff production: Use a needle valve to properly control the discharge speed, not exceeding 10 ml / min;

[0036] (8) Production fluid separation + metering: Use a beaker and a measuring cylinder to measure the production rate, and use a centrifuge to separate oil and water and meter;

[0037] This simulator can be used to conduct vertical well huff and puff experiments, clarify the changes in the range of steam impact and the profile production pattern of multiple rounds of huff and puff under the conditions of compound rhythmic multi-layer steam huff and puff, and determine the dynamic change characteristics of vertical well steam huff and puff production under compound rhythmic conditions.

[0038] Among them, the synchronous injection and production and asynchronous injection and production throughput schemes of the two vertical wells 5 can be specifically that synchronous injection and production are used in the first four rounds of throughput, and the development of the steam chamber is only affected by the reservoir heterogeneity; asynchronous injection and production are used in the last four rounds of throughput, that is, when one side of the well is injecting steam, the other side of the well is in production, so as to reveal the impact of the production work system on the interference between wells.

[0039] When the model box 2 is flipped and erected, the vertical well 5 is just vertical, which can effectively represent the production situation of the vertical well.

[0040] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0041] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sealing, well layout and sand filling simulator, characterized in that: It comprises a base (1), a rotatable model box (2) is mounted on the base (1), and a box cover (3) is provided on the top of the model box (2); The model box (2) has a plurality of evenly distributed galvanic distribution rods (4) fixedly installed therein, and two symmetrically distributed vertical wells (5) are distributed on both sides of the inner cavity of the model box (2), the inlet and outlet of the vertical wells (5) respectively extend out of the model box (2), and the bottom of the model box (2) is provided with a liquid injection wellbore (6), an oil injection wellbore (7) and a vacuum interface (8); The box cover (3) is provided with a top wellbore (9) and a threaded sand filling pipe (31) fixedly installed thereon, and a threaded piston column cover (32) is inserted into the threaded sand filling pipe (31).

2. The sealing, well layout and sand filling simulator according to claim 1, characterized in that: Three liquid injection wellbores (6) are provided, and electromagnetic valves are installed on the liquid injection wellbores (6), the oil injection wellbores (7), the vacuum interface (8) and the top wellbores (9).

3. The sealing, well layout and sand filling simulator according to claim 2, characterized in that: A pressure gauge (81) for detecting the vacuum degree in the model box (2) is also installed at the bottom of the model box (2).

4. The sealing, well layout and sand filling simulator according to claim 1, characterized in that: The top of the piston column cover (32) is provided with a knob, and the root of the piston column cover (32) is provided with an external thread.

5. The sealing, well layout and sand filling simulator according to claim 1, characterized in that: The model box (2) is provided with a plurality of evenly distributed butt screw holes A (2a), and the box cover (3) is provided with a plurality of evenly distributed butt screw holes B (3a).

6. The sealing, well layout and sand filling simulator according to claim 1, characterized in that: Two symmetrically distributed brackets (11) are fixedly mounted on the base (1), and a collar (12) is fixedly mounted on each of the brackets (11), and a threaded fastening screw (13) is inserted into the collar (12). Rotating shafts (21) are fixedly mounted on the outer walls of both sides of the base (1), and the two rotating shafts (21) are respectively inserted into the two collars (12) and are rotatably connected to the collars (12).

7. The sealing, well layout and sand filling simulator according to claim 6, characterized in that: A plurality of locking universal wheels (14) are installed at the bottom of the base (1).

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