Foaming simulation device for foam fracturing fluid

Abstract

The utility model relates to the technical field of foaming simulation of foam fracturing fluid, in particular to a foaming simulation device for the foam fracturing fluid. The foam fracturing fluid foaming simulation device comprises a simulation bin and a simulation crack plate located in the simulation bin, a feeding pipe is fixedly installed at the front end of the simulation bin, a control valve is fixedly installed on the feeding pipe, an access hole is formed in the rear end of the simulation bin, a detachable sealing cover is installed at the access hole, an observation hole is formed in the simulation bin, and the control valve is fixedly installed on the observation hole. A transparent glass cover is fixedly mounted at the observation opening; an environment simulation structure is mounted on the simulation bin and comprises a plurality of groups of electric heating plates which are fixedly mounted in the simulation bin and are arranged and distributed. According to the utility model, the independent temperature controller is used for controlling the plurality of groups of electric heating plates to realize partitioned temperature control in the simulation bin, the temperature gradient of different well depths can be accurately reproduced, and meanwhile, the pressure controller can stably maintain the pressure in the simulation bin, so that foam fracturing fluid is foamed in an environment with the same temperature and pressure as the underground environment, and the accuracy of experimental data is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a foaming simulation technical field of foamed fracturing fluid, especially to a foaming simulation device of foamed fracturing fluid. BACKGROUND

[0002] In the oil and gas exploitation, the foamed fracturing technology is widely applied to the reconstruction operation of low-permeability oil and gas reservoirs because of the advantages of low damage, high sand carrying capacity, easy flowback and the like, and the foaming performance of foamed fracturing fluid directly determines the fracturing construction effect, and it becomes the core prerequisite for optimizing the fracturing fluid formula and formulating the construction scheme to build the environment consistent with the downhole in the laboratory and simulate the foaming process of foamed fracturing fluid.

[0003] The downhole environment is a key factor affecting the foaming performance of foamed fracturing fluid, and the downhole pressure increases linearly with the well depth, and part of the oil and gas wells exist in the inclined working condition, and these environmental parameters can significantly change the physical and chemical properties of foamed fracturing fluid, and then affect the foaming effect, the public number CN111411930B provides a kind of compact gas reservoir fracturing fluid visual dynamic filtration and drainage simulation device;Although the device can simulate real fractures and confining pressure environment, its technical focus is to study the filtration law and long-term drainage effect of fracturing fluid, and the environmental simulation system aims to provide a whole uniform or specific environment for studying filtration for core, cannot simulate the temperature gradient corresponding to different well depths, and the actual downhole temperature and pressure dynamically change with depth, and the foaming performance of fracturing fluid in different well sections is significantly different, and the overall control of the device can cause the deviation between the simulated environment and the actual downhole to be too large, and affect the precision of experimental data.

[0004] Therefore, it is necessary to provide a new foaming simulation device of foamed fracturing fluid to solve the above technical problems. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the utility model provides a new foaming simulation device of foamed fracturing fluid.

[0006] The foaming simulation device of foamed fracturing fluid provided by the utility model comprises a simulation bin and a simulation fracture plate located in the simulation bin, a feed pipe is fixedly installed at the front end of the simulation bin, a control valve is fixedly installed on the feed pipe, a maintenance opening is formed at the rear end of the simulation bin, and a detachable cover is installed at the maintenance opening, an observation opening is formed in the simulation bin, and a transparent glass cover is fixedly installed at the observation opening;

[0007] The environment simulation structure is arranged on the simulation bin and comprises a plurality of groups of electric heating plates arranged and distributed in the interior of the simulation bin, each group of two electric heating plates is fixedly arranged on the upper and lower inner walls of the simulation bin, a plurality of temperature controllers are fixedly arranged on the outer wall of the simulation bin, each temperature controller controls a group of two electric heating plates, a lining plate is arranged between the electric heating plates and the simulation crack plate, and a pressure controller for controlling the pressure in the interior of the simulation bin is further arranged on the simulation bin.

[0008] Preferably, a heat-conducting partition plate is further fixedly arranged in the interior of the simulation bin and located between the lining plate and the electric heating plate.

[0009] Preferably, the heat-conducting partition plate is in clearance fit with the electric heating plate.

[0010] Preferably, a heat-insulating partition plate for separately separating each electric heating plate is fixedly arranged on the heat-conducting partition plate.

[0011] Preferably, a sealing gasket is fixedly arranged on the inner wall of the cover, a connecting mechanism is arranged on the cover, and the cover is detachably connected with the simulation bin through the connecting mechanism.

[0012] Preferably, the connecting mechanism comprises two groups of connecting plates fixedly arranged on the simulation bin and the cover respectively, and the two groups of connecting plates are locked through bolts.

[0013] Preferably, a support seat capable of controlling the inclination angle of the simulation bin is arranged at the bottom of the simulation bin.

[0014] Preferably, the number of the support seats is four, the four support seats are respectively arranged at the four corners of the simulation bin, each support seat comprises a foot pad fixed to the ground, a pneumatic cylinder is fixedly arranged on the foot pad, a piston rod is fixedly arranged at the output end of the pneumatic cylinder, and the upper end of the piston rod is rotatably connected with the corner of the simulation bin through a universal joint.

[0015] Compared with the related art, the foam fracturing fluid foaming simulation device has the following beneficial effects:

[0016] The independent temperature controller is used for controlling the plurality of groups of electric heating plates to realize the temperature control in the partition of the simulation bin, the temperature gradient of different well depths can be accurately reproduced, the pressure controller can stably maintain the pressure in the simulation bin, the foam fracturing fluid is foamed in the temperature and pressure environment consistent with the downhole, and the accuracy of experimental data is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of a preferred embodiment of the foam fracturing fluid foaming simulation device provided by the utility model;

[0018] Figure 2 Fig. 2 is a structural schematic view of a rear side of the simulation bin shown in Fig. 1; Figure 1

[0019] Figure 3 Fig. 3 is a partial structural schematic view of the simulation bin shown in Fig. 1; Figure 1

[0020] Figure 4 Fig. 4 is a structural schematic view of the cover shown in Fig. 1; Figure 1

[0021] Figure 5 Fig. 5 is a structural schematic view of the simulation crack plate shown in Fig. 1. Figure 1 Fig. 1 is a structural schematic view of a simulation bin according to the present application; Fig. 2 is a structural schematic view of a rear side of the simulation bin shown in Fig. 1; Fig. 3 is a partial structural schematic view of the simulation bin shown in Fig. 1; Fig. 4 is a structural schematic view of the cover shown in Fig. 1; Fig. 5 is a structural schematic view of the simulation crack plate shown in Fig. 1.

[0022] DETAILED DESCRIPTION In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0023] The specific implementation of the present application is described in detail below in combination with specific examples.

[0024] Please refer to

[0025] Figures 1 to 5 ​​​​The utility model discloses a kind of foamed fracturing fluid foaming simulation devices, foamed fracturing fluid foaming simulation device includes: simulation bin 1 and the simulation fracture plate 15 located in simulation bin 1 inside, simulation bin 1 front end is fixedly installed with feed pipe 11, and control valve 12 is fixedly installed on feed pipe 11, the rear end of simulation bin 1 is set with access hole 13, and removable cover 3 is installed at access hole 13, observation port 14 is set up on simulation bin 1, and transparent glass cover is fixedly installed at observation port 14;Simulation bin 1 is installed with environment simulation structure 2, environment simulation structure 2 includes multiple groups of electric heating plate 21 fixedly installed in simulation bin 1 inside arrangement distribution, and every group two electric heating plates 21 are respectively fixedly installed on the upper and lower two sides inner wall of simulation bin 1, multiple temperature controllers 22 are fixedly installed on the outer wall of simulation bin 1, and every temperature controller 22 separately controls a group of two electric heating plates 21, electric heating plate 21 and simulation fracture plate 15 between installation have lining plate 16, simulation bin 1 is also installed with pressure controller 23 of controlling the pressure in simulation bin 1.

[0026] It should be noted that: the feeding pipe 11 of the utility model is used for the entering of foam fracturing fluid raw materials; before the experiment, the closed space is formed after the rear end maintenance opening 13 of the simulation bin 1 is closed by the detachable cover 3, so as to avoid material leakage or pressure loss; at the same time, according to the experimental target (such as simulating the foaming environment of a certain well depth), the target temperature of each group of electric heating plates 21 is preset through the temperature controller 22 (each group of two electric heating plates 21 acts on the upper and lower areas of the simulation bin 1 respectively, so as to ensure the temperature uniformity), the internal pressure of the simulation bin 1 is preset through the pressure controller 23, the initialization of the environmental parameters after replacement is completed, and the foundation for subsequent foaming simulation is laid; when the experiment is carried out, the control valve 12 on the feeding pipe 11 is opened, the foam fracturing fluid raw materials (including base fluid, foaming agent, etc.) are injected into the simulation fracture plate 15 fracture in the simulation bin 1 through the feeding pipe 11, the opening degree of the control valve 12 can be adjusted to accurately control the feeding flow, the slow injection can simulate the slow penetration process of the fracturing fluid in the fracture in the well, the high-speed injection can simulate the rapid pushing scene during high-pressure construction, and it is ensured that the materials can uniformly cover the simulation fracture plate 15 in the simulation bin 1; after the materials are injected, the feeding pipe 11 is closed through the control valve 12, so as to ensure the closed nature of the simulation bin 1; at this time, the environmental simulation structure 2 is started: each group of electric heating plates 21 generates heat under the independent control of the corresponding temperature controller 22, the heat is uniformly conducted to the simulation fracture plate 15 and the surrounding space through the lining plate 16 (the lining plate 16 separates the electric heating plate 21 and the simulation fracture plate 15, so as to avoid direct abrasion), and temperature regulation is realized; the pressure controller 23 controls the pressure environment required by the simulation fracture plate 15 in the simulation bin 1, realizes the accurate simulation of the foaming process, the experimenters observe the foaming speed, foam density, foam adhesion state and other key phenomena of the fracturing fluid on the surface of the simulation fracture plate 15 through the transparent glass cover of the observation opening 14 in real time, non-destructive real-time observation can be realized, and it is more convenient to record the foaming dynamic data; after the experiment is completed, the simulation bin 1 is depressurized and cooled (natural cooling or external cooling equipment can be placed for cooling), the cover 3 is disassembled, the simulation fracture plate 15 and the lining plate 16 are cleaned or replaced through the maintenance opening 13, and the next simulation experiment is prepared; the utility model realizes the temperature control of the simulation bin 1 through the independent temperature controller 22 and multiple electric heating plates 21, the temperature gradient of different well depths can be accurately reproduced, the pressure controller 23 can stably maintain the pressure in the simulation bin 1, the foam fracturing fluid is foamed in the consistent temperature and pressure environment with the well, and the accuracy of the experimental data is improved.

[0027] It is worth noting that: the simulation bin 1 is further provided with a heat-conducting partition plate 17, and the heat-conducting partition plate 17 is located between the lining plate 16 and the electric heating plate 21; the heat-conducting partition plate 17 can physically separate the lining plate 16 and the electric heating plate 21, avoid the damage of the electric heating plate 21 due to the extrusion of the lining plate 16, and prolong the service life of the electric heating plate 21.

[0028] The heat-conducting partition plate 17 is in clearance fit with the electric heating plate 21, so that sufficient safety space is formed between the heat-conducting partition plate 17 and the electric heating plate 21, the heat-conducting partition plate 17 is prevented from being deformed to press the electric heating plate 21 after being pressed for a long time, and the use safety of the electric heating plate 21 is protected.

[0029] Further, the heat-conducting partition plate 17 is fixedly provided with a heat-insulating partition plate 18 for separately partitioning each electric heating plate 21.

[0030] It is worth noting that the inner wall of the cover 3 is fixedly provided with a sealing gasket 31, the cover 3 is provided with a connecting mechanism 4, and the cover 3 is detachably connected with the simulation bin 1 through the connecting mechanism 4.

[0031] The connecting mechanism 4 comprises two groups of connecting plates 41 fixedly provided on the simulation bin 1 and the cover 3 respectively, and the two groups of connecting plates 41 are locked through bolts 42.

[0032] It is particularly worth noting that, in order to avoid the temperature gradient of the simulation crack plate 15 disappearing due to heat exchange of the simulation crack plate 15 itself, the simulation crack plate 15 can be made of an alumina ceramic base material.

[0033] In the embodiment of the utility model, please refer to Figure 1 and Figure 2 The bottom of the simulation bin 1 is provided with a support seat 5 capable of controlling the inclination angle of the simulation bin 1.

[0034] It should be noted that: during the experiment, the target well conditions (such as the inclination angle of a certain inclined well) can be adjusted to make the simulation bin 1 inclined to the corresponding angle by adjusting the support seat 5, at this time, the internal simulation fracture plate 15 is also inclined synchronously with the simulation bin 1, the physical environment of the downhole inclined fracture is restored, and multiple comparison experiments (such as the influence of different inclination angles on the foaming speed and foam stability of the fracturing fluid under the same temperature and pressure conditions) can be supported, and the accuracy of the bubble simulation data of the foam fracturing fluid is improved.

[0035] The support seat 5 is four in number, and the four support seats 5 are located at the four corners of the simulation bin 1, each support seat 5 comprises a foot pad 53 fixed to the ground, and a pneumatic cylinder 51 is fixedly installed on the foot pad 53, the output end of the pneumatic cylinder 51 is fixedly installed with a piston rod 52, and the upper end of the piston rod 52 is rotatably connected with the corner of the simulation bin 1 through a universal joint; the pneumatic cylinder 51 controls the extension and retraction of the piston rod 52, and by controlling the extension and retraction amount of the piston rod 52 of different support seats 5, the simulation bin 1 can be inclined in multiple directions and at multiple angles, for example, the piston rods 52 of the front two groups of support seats 5 are controlled to be shortened, and the rear two groups are controlled to be lengthened, so that the front end of the simulation bin 1 is low and the rear end is high, and the working condition of the inclined well inclined downward can be simulated; the left two groups are controlled to be shortened, and the right two groups are controlled to be lengthened, so that the working condition of the horizontal well transversely inclined can be simulated, and various well conditions required by the experiment are covered.

[0036] In addition, the power element of the pneumatic cylinder 51 in the utility model comprises a pneumatic control unit (electromagnetic reversing valve, flow control valve) and a gas source supply unit (air compressor, gas storage tank, air pipe), the pneumatic control unit is integrated in a control box and fixed to the bottom corner of the simulation bin 1 (one group for each support seat), and the gas source supply unit is installed on the ground support outside the simulation bin 1, and the air pipe is connected to the control box in four ways; the gas storage tank is connected to the control box through the main air pipe, the valve in the control box is connected to the chamber of the pneumatic cylinder 51 through the branch air pipe, and the electromagnetic reversing valve is also connected to the main control system, so as to control the extension and retraction amount of the piston rod 52 and realize the multi-directional inclination of the simulation bin 1, and the specific action control of the power element of the pneumatic cylinder 51 and the main control system all belong to the conventional technology in the field, and therefore will not be described in detail.

[0037] The circuit and the control involved in the utility model are prior art, and will not be described in detail here.

[0038] The above only describes the embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion according to the content of the utility model specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A foaming fracturing fluid foaming simulation device, comprising a simulation bin (1) and a simulation fracture plate (15) inside the simulation bin (1), characterized in that: a feeding pipe (11) is fixedly installed at the front end of the simulation bin (1), a control valve (12) is fixedly installed on the feeding pipe (11), an inspection opening (13) is formed at the rear end of the simulation bin (1), and a detachable cover (3) is installed at the inspection opening (13); an observation opening (14) is formed on the simulation bin (1), and a transparent glass cover is fixedly installed at the observation opening (14); an environment simulation structure (2) is installed on the simulation bin (1), the environment simulation structure (2) comprises a plurality of groups of electric heating plates (21) arranged and distributed inside the simulation bin (1), each group of two electric heating plates (21) is fixedly installed on the upper and lower inner walls of the simulation bin (1), a plurality of temperature controllers (22) are fixedly installed on the outer wall of the simulation bin (1), each temperature controller (22) controls a group of two electric heating plates (21) individually, a lining plate (16) is installed between the electric heating plates (21) and the simulation fracture plate (15), and a pressure controller (23) for controlling the pressure inside the simulation bin (1) is also installed on the simulation bin (1).

2. The foamed fracturing fluid foam-up simulation apparatus of claim 1, wherein, A heat-conducting partition plate (17) is also fixedly installed inside the simulation bin (1), and the heat-conducting partition plate (17) is located between the lining plate (16) and the electric heating plate (21).

3. The foamed fracturing fluid foam-up simulation apparatus of claim 2, wherein, The heat-conducting partition plate (17) is gap-fitted with the electric heating plate (21).

4. The foamed fracturing fluid foam-up simulation apparatus of claim 3, wherein, A heat-insulating partition plate (18) is fixedly installed on the heat-conducting partition plate (17) to individually separate each electric heating plate (21).

5. The foamed fracturing fluid foam-up simulation apparatus of claim 1, wherein, A sealing gasket (31) is fixedly installed on the inner wall of the cover (3), a connecting mechanism (4) is installed on the cover (3), and the cover (3) is detachably connected with the simulation bin (1) through the connecting mechanism (4).

6. The foamed fracturing fluid foam-up simulation apparatus of claim 5, wherein, The connecting mechanism (4) comprises two groups of connecting plates (41) fixedly installed on the simulation bin (1) and the cover (3) respectively, and the two groups of connecting plates (41) are locked by bolts (42).

7. The foamed fracturing fluid foam-up simulation apparatus of claim 1, wherein, A support seat (5) is installed at the bottom of the simulation bin (1) to control the inclination angle of the simulation bin (1).

8. The foamed fracturing fluid foam-up simulation apparatus of claim 7, wherein, The support seat (5) is provided in four numbers, and the four support seats (5) are respectively located at the four corners of the simulation bin (1); each support seat (5) comprises a foot pad (53) fixed to the ground, a gas cylinder (51) is fixedly installed on the foot pad (53), a piston rod (52) is fixedly installed at the output end of the gas cylinder (51), and the upper end of the piston rod (52) is rotationally connected with the corner of the simulation bin (1) through a universal joint.

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