An apparatus for preparing crude oil emulsions and a method for using them.

Abstract

This application discloses an apparatus and method for preparing crude oil emulsions, belonging to the field of emulsion preparation devices. It solves the problem that current crude oil emulsion preparation methods are severely disconnected from actual reservoir seepage conditions, leading to subsequent testing of the crude oil emulsions failing to fully reflect the state of the actual reservoir porous media. A sealing cover is detachably connected to the top of the emulsification chamber. Both the crude oil delivery mechanism and the injected fluid delivery mechanism are connected to the inner cavity of the emulsification chamber. A porous medium is provided inside the emulsification chamber, located at the bottom. A stirring mechanism is fixed to the sealing cover, with its stirring end extending into the emulsification chamber through the sealing cover. A heating mechanism is located on the outer wall of the emulsification chamber. A pressure control mechanism is connected to the emulsification chamber. An emulsion collection mechanism is connected to the bottom of the emulsification chamber. This application simulates the seepage conditions of injected fluid emulsifying crude oil in the porous media of the reservoir, accurately reflecting the mixing state of the injected fluid and crude oil under actual reservoir conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of emulsion preparation devices, and particularly relates to a device for preparing crude oil emulsion and a use method. BACKGROUND

[0002] Under the characteristics of the interfacial film adsorption of active substances in crude oil and injection fluid, when the crude oil and the injection fluid flow in the pore medium of the formation, the crude oil emulsion is formed, and the characteristics and the percolation state of the crude oil emulsion are different from those of the single-phase crude oil or the injection fluid, therefore, the research on the properties of the crude oil emulsion is the key point of the efficient development of the oil reservoir.

[0003] At present, when the crude oil emulsion is prepared, the crude oil and the injection fluid are usually mixed according to a certain proportion, and then the crude oil is dispersed in the injection fluid through a stirrer, an emulsifier, ultrasonic emulsification and the like, so that the crude oil emulsion is obtained. However, the preparation method is to obtain the crude oil emulsion in the room container, which is completely separated from the actual reservoir condition. In the actual reservoir, the place where the crude oil and the injection fluid form the crude oil emulsion is the reservoir porous medium, and the percolation condition, the percolation power, the adhesion of the crude oil on the pore wall, the temperature, the pressure, the flow difference of the oil phase and the water phase in the pore medium, the diffusion and adsorption loss of the emulsified oil displacement agent on the rock mineral surface all have influences on the formation and flow of the crude oil emulsion. The conventional laboratory container preparation method of the crude oil emulsion completely ignores the influences of the above factors, and the subsequent test of the crude oil emulsion cannot fully reflect the state in the actual reservoir pore medium. SUMMARY

[0004] The device for preparing the crude oil emulsion and the use method provided by the present application solve the problem that the preparation of the crude oil emulsion is seriously separated from the actual percolation condition of the reservoir, and the subsequent test of the crude oil emulsion cannot fully reflect the state in the actual reservoir pore medium.

[0005] In a first aspect, an embodiment of the present application provides a device for preparing crude oil emulsion, which comprises a crude oil conveying mechanism, an injection fluid conveying mechanism, an emulsification chamber, a sealing cover, a porous medium, a stirring mechanism, a heating mechanism, a pressure control mechanism and an emulsion collecting mechanism; the top of the emulsification chamber is detachably connected with the sealing cover, and the sealing cover is used for opening and closing the internal space of the emulsification chamber; the crude oil conveying mechanism and the injection fluid conveying mechanism are both in communication with the inner cavity of the emulsification chamber; the inner cavity of the emulsification chamber is provided with the porous medium, and the porous medium is located at the bottom end of the emulsification chamber; the stirring mechanism is fixed on the sealing cover, the stirring end of the stirring mechanism extends into the emulsification chamber through the sealing cover, and the stirring end of the stirring mechanism is located above the porous medium; the heating mechanism is arranged on the outer wall of the emulsification chamber and can heat the fluid in the emulsification chamber; the pressure control mechanism is in communication with the inner cavity of the emulsification chamber and can adjust the pressure in the inner cavity of the emulsification chamber; and the emulsion collecting mechanism is in communication with the bottom of the emulsification chamber.

[0006] In combination with the first aspect, in a possible implementation manner, the crude oil conveying mechanism comprises a crude oil storage tank and a first constant-speed constant-pressure pump; the bottom of the crude oil storage tank and the first constant-speed constant-pressure pump are in communication through a pipeline, and the top of the crude oil storage tank and the emulsification chamber are in communication through a pipeline.

[0007] In combination with the first aspect, in a possible implementation manner, the injection fluid conveying mechanism comprises an injection fluid storage tank and a second constant-speed constant-pressure pump; the bottom of the injection fluid storage tank and the second constant-speed constant-pressure pump are in communication through a pipeline, and the top of the injection fluid storage tank and the emulsification chamber are in communication through a pipeline.

[0008] In combination with the first aspect, in a possible implementation manner, the device for preparing crude oil emulsion further comprises a three-way valve; the first liquid inlet of the three-way valve and the top of the crude oil storage tank are in communication through a pipeline, the second liquid inlet of the three-way valve and the top of the injection fluid storage tank are in communication through a pipeline, and the liquid outlet of the three-way valve and the emulsification chamber are in communication through a pipeline.

[0009] In combination with the first aspect, in a possible implementation manner, the stirring mechanism comprises a control structure, a stirring rod and a stirring paddle; the control structure is fixed on the top of the sealing cover; the control structure is connected with one end of the stirring rod, and the other end of the stirring rod is connected with the stirring paddle after penetrating through the sealing cover; the axis of the stirring rod is parallel to the axis of the emulsification chamber; and the stirring paddle is located above the porous medium.

[0010] With reference to the first aspect, in a possible implementation manner, the heating mechanism comprises a constant-temperature heating jacket and a temperature controller; the constant-temperature heating jacket is sleeved on the outer wall of the emulsification chamber, and the constant-temperature heating jacket and the temperature controller are electrically connected.

[0011] With reference to the first aspect, in a possible implementation manner, the pressure control mechanism comprises a first valve, a pressure gauge, a gas pressure reducing valve and a high-pressure gas cylinder; the high-pressure gas cylinder and the emulsification chamber are communicated through a pipeline, and the pipeline between the high-pressure gas cylinder and the emulsification chamber is provided with the gas pressure reducing valve, the pressure gauge and the first valve.

[0012] With reference to the first aspect, in a possible implementation manner, the emulsion collecting mechanism comprises a second valve, a flow rate controller and a collecting structure; the collecting structure and the emulsification chamber are communicated through a pipeline, and the pipeline between the collecting structure and the emulsification chamber is provided with the flow rate controller and the second valve.

[0013] With reference to the first aspect, in a possible implementation manner, the porous medium is a core.

[0014] The second aspect provides a use method of the device for preparing crude oil emulsion provided in the embodiments of the present application, which uses the device for preparing crude oil emulsion described above, and comprises the following steps.

[0015] Injecting a certain volume of crude oil into the inner cavity of the emulsification chamber through the crude oil conveying mechanism;

[0016] Injecting a certain volume of injection fluid into the inner cavity of the emulsification chamber through the injection fluid conveying mechanism;

[0017] Starting the heating mechanism to heat the fluid in the inner cavity of the emulsification chamber;

[0018] Starting the pressure control mechanism to adjust the pressure in the inner cavity of the emulsification chamber to a required value;

[0019] Starting the stirring mechanism to stir the fluid above the porous medium;

[0020] Starting the emulsion collecting mechanism to collect the crude oil emulsion flowing through the porous medium.

[0021] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] The device for preparing crude oil emulsion provided by the embodiment of the application comprises a crude oil conveying mechanism, an injection fluid conveying mechanism, an emulsification chamber, a sealing cover, a porous medium, a stirring mechanism, a heating mechanism, a pressure control mechanism and an emulsion collecting mechanism. The top of the emulsification chamber is detachably connected with the sealing cover, and the sealing cover is used for opening and closing the internal space of the emulsification chamber. The crude oil conveying mechanism and the injection fluid conveying mechanism are both in communication with the inner cavity of the emulsification chamber. The inner cavity of the emulsification chamber is provided with the porous medium, and the porous medium is located at the bottom end of the emulsification chamber. The stirring mechanism is fixed on the sealing cover, the stirring end of the stirring mechanism extends into the emulsification chamber through the sealing cover, and the stirring end of the stirring mechanism is located above the porous medium. The heating mechanism is arranged on the outer wall of the emulsification chamber and can heat the fluid in the emulsification chamber. The pressure control mechanism is in communication with the inner cavity of the emulsification chamber and can adjust the pressure in the inner cavity of the emulsification chamber. The emulsion collecting mechanism is in communication with the bottom of the emulsification chamber. When the crude oil emulsion is prepared, the crude oil and the injection fluid are first injected into the emulsification chamber, then the fluid in the emulsification chamber is heated, then the pressure in the emulsification chamber is adjusted to a required value through the pressure control mechanism, then the fluid is stirred through the stirring mechanism, so that the crude oil and the injection fluid can uniformly enter the porous medium, and finally the emulsion collecting mechanism is opened, so that the crude oil emulsion in the porous medium flows into the emulsion collecting mechanism from the bottom of the emulsification chamber. The device is compact in structure, convenient to operate, reliable in emulsification effect, and can more truly simulate the seepage conditions of the injection fluid in the emulsification of the crude oil in the porous medium of the oil reservoir, so as to more accurately reflect the mixing state of the injection fluid and the crude oil under the actual conditions of the oil reservoir. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described in the following are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] Figure 1 The structural schematic diagram of the device for preparing crude oil emulsion provided by the embodiment of the present application is shown.

[0025] Figure: 1-crude oil conveying mechanism; 1a-crude oil storage tank; 1b-first constant speed and constant pressure pump; 2-injection fluid conveying mechanism; 2a-injection fluid storage tank; 2b-second constant speed and constant pressure pump; 3-emulsification chamber; 4-sealing cover; 5-porous medium; 6-stirring mechanism; 61-control structure; 62-stirring rod; 63-stirring paddle; 7-heating mechanism; 71-constant temperature heating jacket; 72-temperature controller; 8-pressure control mechanism; 81-first valve; 82-pressure gauge; 83-gas pressure reducing valve; 84-high pressure gas cylinder; 9-emulsion collecting mechanism; 91-second valve; 92-flow rate controller; 93-collecting structure; 10-three-way valve. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0028] As shown in Figure 1 The present application provides a device for preparing crude oil emulsion, which comprises a crude oil conveying mechanism 1, an injection fluid conveying mechanism 2, an emulsification chamber 3, a sealing cover 4, a porous medium 5, a stirring mechanism 6, a heating mechanism 7, a pressure control mechanism 8 and an emulsion collection mechanism 9. In actual application, the emulsification chamber 3 is a polytetrafluoroethylene sleeve, which has the advantages of high temperature resistance and corrosion resistance.

[0029] Continuing to refer to Figure 1 As shown in the figure, the top of the emulsification chamber 3 is detachably connected with the sealing cover 4, and the sealing cover 4 is used to open and close the internal space of the emulsification chamber 3. In actual application, the sealing cover 4 can open the internal space of the emulsification chamber 3, so as to facilitate the thorough cleaning of the inner cavity of the emulsification chamber 3 or the replacement of the porous medium 5. Specifically, a groove for embedding the emulsification chamber 3 is arranged on the sealing cover 4, so as to facilitate the installation of the sealing cover 4, ensure the installation position of the sealing cover 4, and avoid the mispositioning of the sealing cover 4.

[0030] In practical application, the crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2 are both communicated with the inner cavity of the emulsification chamber 3. Specifically, the crude oil is injected into the emulsification chamber 3 through the crude oil conveying mechanism 1, and the injection fluid is injected into the emulsification chamber 3 through the injection fluid conveying mechanism 2. The crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2 are both communicated with the inner cavity of the emulsification chamber 3 through the sealing cover 4, and high-temperature-resistant composite sealing rubber blocks are arranged at the connection positions of the crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2 and the sealing cover 4. Further, the injection fluid is water or emulsified oil displacement agent solution.

[0031] With reference to Fig. 1, the emulsification chamber 3 is communicated with the crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2. Figure 1 As shown in Fig. 1, the inner cavity of the emulsification chamber 3 is provided with a porous medium 5, and the porous medium 5 is located at the bottom end of the emulsification chamber 3. In practical application, the porous medium 5 can simulate the actual seepage conditions of the oil reservoir, so as to accurately reflect the mixing state of the injection fluid and the crude oil under the actual conditions of the oil reservoir.

[0032] With reference to Fig. 1, the emulsification chamber 3 is communicated with the crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2. Figure 1 As shown in Fig. 1, the stirring mechanism 6 is fixed on the sealing cover 4, the stirring end of the stirring mechanism 6 extends into the emulsification chamber 3 through the sealing cover 4, and the stirring end of the stirring mechanism 6 is located above the porous medium 5. In practical application, the stirring mechanism 6 can fully mix the crude oil and the injection fluid, so that the crude oil and the injection fluid can uniformly enter the porous medium 5, and then the crude oil emulsion with more uniform particle size can be obtained.

[0033] In practical application, the heating mechanism 7 is arranged on the outer wall of the emulsification chamber 3 and can heat the fluid in the emulsification chamber 3. Specifically, the heating mechanism 7 can heat the emulsification chamber 3, so as to heat the crude oil and the injection fluid in the emulsification chamber 3, and then simulate the actual temperature of the oil reservoir.

[0034] With reference to Fig. 1, the emulsification chamber 3 is communicated with the crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2. Figure 1 As shown in Fig. 1, the pressure control mechanism 8 is communicated with the inner cavity of the emulsification chamber 3 and can adjust the pressure of the inner cavity of the emulsification chamber 3. Specifically, the pressure control mechanism 8 can adjust the pressure in the emulsification chamber 3 to a required value, so as to more truly simulate the pressure environment of the oil reservoir.

[0035] In practical application, the emulsion collecting mechanism 9 is communicated with the bottom of the emulsification chamber 3. Specifically, when the emulsion collecting mechanism 9 is opened, the crude oil emulsion in the porous medium 5 will flow into the emulsion collecting mechanism 9 from the bottom of the emulsification chamber 3, so that the flow speed of the crude oil emulsion in the porous medium 5 can be controlled by controlling the collection speed of the emulsion collecting mechanism 9, and then the constant seepage speed of the oil reservoir can be simulated.

[0036] The embodiment of the present application provides a device for preparing crude oil emulsion, which comprises a crude oil conveying mechanism 1, a injection fluid conveying mechanism 2, an emulsification chamber 3, a sealing cover 4, a porous medium 5, a stirring mechanism 6, a heating mechanism 7, a pressure control mechanism 8 and an emulsion collecting mechanism 9. The top of the emulsification chamber 3 is detachably connected with the sealing cover 4, and the sealing cover 4 is used for opening and closing the internal space of the emulsification chamber 3. The crude oil conveying mechanism 1 and the injection fluid conveying mechanism 2 are both communicated with the inner cavity of the emulsification chamber 3. The inner cavity of the emulsification chamber 3 is provided with the porous medium 5, and the porous medium 5 is located at the bottom end of the emulsification chamber 3. The stirring mechanism 6 is fixed on the sealing cover 4, the stirring end of the stirring mechanism 6 extends into the emulsification chamber 3 through the sealing cover 4, and the stirring end of the stirring mechanism 6 is located above the porous medium 5. The heating mechanism 7 is arranged on the outer wall of the emulsification chamber 3 and can heat the fluid in the emulsification chamber 3. The pressure control mechanism 8 is communicated with the inner cavity of the emulsification chamber 3 and can adjust the pressure in the inner cavity of the emulsification chamber 3. The emulsion collecting mechanism 9 is communicated with the bottom of the emulsification chamber 3. When the crude oil emulsion is prepared, the crude oil and the injection fluid are first injected into the emulsification chamber 3, then the fluid in the emulsification chamber 3 is heated, then the pressure in the emulsification chamber 3 is adjusted to a required value through the pressure control mechanism 8, then the fluid is stirred through the stirring mechanism 6, so that the crude oil and the injection fluid can uniformly enter the porous medium 5, and finally the emulsion collecting mechanism 9 is opened, so that the crude oil emulsion in the porous medium 5 flows into the emulsion collecting mechanism 9 from the bottom of the emulsification chamber 3. The present application has the advantages of compact structure, convenient operation, reliable emulsification effect and the like, and more truly simulates the seepage conditions of the injection fluid in the oil reservoir porous medium 5 for emulsifying the crude oil, so that the mixing state of the injection fluid and the crude oil under the actual conditions of the oil reservoir can be more accurately reflected.

[0037] With reference to the Figure 1 As shown in the figure, the crude oil conveying mechanism 1 comprises a crude oil storage tank 1a and a first constant-speed constant-pressure pump 1b. The bottom of the crude oil storage tank 1a and the first constant-speed constant-pressure pump 1b are communicated through a pipeline, and the top of the crude oil storage tank 1a and the emulsification chamber 3 are communicated through a pipeline. In actual application, the first constant-speed constant-pressure pump 1b supplies pressure to the crude oil storage tank 1a through a pipeline, so that the crude oil in the crude oil storage tank 1a enters the emulsification chamber 3 through a pipeline. The first constant-speed constant-pressure pump 1b can accurately adjust the injection amount of the crude oil, so that the injected crude oil and the injection fluid can reach a required proportion.

[0038] Specifically, the injection fluid delivery mechanism 2 comprises an injection fluid storage tank 2a and a second constant-speed constant-pressure pump 2b. The bottom of the injection fluid storage tank 2a and the second constant-speed constant-pressure pump 2b are communicated through a pipeline, and the top of the injection fluid storage tank 2a and the emulsification chamber 3 are communicated through a pipeline. In actual application, the second constant-speed constant-pressure pump 2b supplies pressure to the injection fluid storage tank 2a through a pipeline, so that the injection fluid in the injection fluid storage tank 2a enters the emulsification chamber 3 through a pipeline. The second constant-speed constant-pressure pump 2b can accurately adjust the injection amount of the injection fluid, so that the injected injection fluid and the crude oil can reach the required proportion.

[0039] In actual application, the device for preparing crude oil emulsion further comprises a three-way valve 10. The first liquid inlet of the three-way valve 10 and the top of the crude oil storage tank 1a are communicated through a pipeline, the second liquid inlet of the three-way valve 10 and the top of the injection fluid storage tank 2a are communicated through a pipeline, and the liquid outlet of the three-way valve 10 and the emulsification chamber 3 are communicated through a pipeline. Specifically, the three-way valve 10 can mix the crude oil and the injection fluid before entering the emulsification chamber 3, so as to increase the contact time of the crude oil and the injection fluid and make them fully mixed, so that the crude oil and the injection fluid can enter the porous medium 5 more uniformly, and thus the crude oil emulsion with more uniform particle size can be obtained.

[0040] Continuing to refer to Figure 1 As shown, the stirring mechanism 6 comprises a control structure 61, a stirring rod 62 and a stirring paddle 63. The control structure 61 is fixed on the top of the sealing cover 4. The control structure 61 is connected with one end of the stirring rod 62, and the other end of the stirring rod 62 is connected with the stirring paddle 63 after penetrating through the sealing cover 4. The axis of the stirring rod 62 is parallel to the axis of the emulsification chamber 3. The stirring paddle 63 is located above the porous medium 5. In actual application, the control structure 61 can drive the stirring rod 62 to rotate and can adjust the rotating speed of the stirring rod 62. The rotation of the stirring rod 62 drives the stirring paddle 63 to rotate, so as to ensure that the crude oil and the injection fluid can be fully mixed.

[0041] In actual application, the heating mechanism 7 comprises a constant-temperature heating jacket 71 and a temperature controller 72. The constant-temperature heating jacket 71 is sleeved on the outer wall of the emulsification chamber 3, and the constant-temperature heating jacket 71 is electrically connected with the temperature controller 72. Specifically, the temperature controller 72 adjusts the constant-temperature heating jacket 71 to a suitable temperature, so that the constant-temperature heating jacket 71 can heat the emulsification chamber 3, thereby heating the fluid in the emulsification chamber 3 and further more accurately simulating the actual temperature of the oil reservoir. Further, the temperature controller 72 is provided with a temperature display screen to facilitate observation of the temperature in the emulsification chamber 3.

[0042] As Figure 1As shown, the pressure control mechanism 8 includes a first valve 81, a pressure gauge 82, a gas pressure reducing valve 83 and a high-pressure gas cylinder 84. The high-pressure gas cylinder 84 and the emulsification chamber 3 are connected by a pipeline, and the pipeline between the high-pressure gas cylinder 84 and the emulsification chamber 3 is provided with the gas pressure reducing valve 83, the pressure gauge 82 and the first valve 81. Specifically, before injecting the crude oil and the injection fluid into the emulsification chamber 3, the first valve 81 is opened, and at the same time, the pressure in the emulsification chamber 3 is adjusted by the gas pressure reducing valve 83 to simulate the pressure environment of the oil reservoir. Specifically, the high-pressure gas cylinder 84 is a high-pressure nitrogen cylinder.

[0043] Continuing to refer to Figure 1 As shown, the emulsion collection mechanism 9 includes a second valve 91, a flow rate controller 92 and a collection structure 93. The collection structure 93 and the emulsification chamber 3 are connected by a pipeline, and the pipeline between the collection structure 93 and the emulsification chamber 3 is provided with the flow rate controller 92 and the second valve 91. In actual application, when it is necessary to collect the crude oil emulsion, the outflow speed of the crude oil emulsion is set by the flow rate controller 92 to simulate the seepage flow speed environment of the oil reservoir, and then the second valve 91 is opened to enable the crude oil emulsion to enter the collection structure 93 through the pipeline, so as to more truly simulate the seepage conditions of the injection fluid emulsifying the crude oil in the porous medium 5 of the oil reservoir, and further more accurately reflect the mixing state of the injection fluid and the crude oil under the actual conditions of the oil reservoir.

[0044] In actual application, the porous medium 5 is a core. Of course, the porous medium 5 can also be a sandpack model.

[0045] Specifically, the embodiment of the present application provides a use method of the device for preparing the crude oil emulsion, which comprises the following steps:

[0046] A certain volume of crude oil is injected into the inner cavity of the emulsification chamber 3 by the crude oil delivery mechanism 1.

[0047] A certain volume of injection fluid is injected into the inner cavity of the emulsification chamber 3 by the injection fluid delivery mechanism 2.

[0048] The heating mechanism 7 is opened to heat the fluid in the inner cavity of the emulsification chamber 3.

[0049] The pressure control mechanism 8 is opened to adjust the pressure in the inner cavity of the emulsification chamber 3 to a required value.

[0050] The stirring mechanism 6 is opened to stir the fluid above the porous medium 5.

[0051] The emulsion collection mechanism 9 is opened to collect the crude oil emulsion flowing through the porous medium 5.

[0052] In order to more clearly show the present application, the following specific operation examples are given:

[0053] Example 1, the device for preparing crude oil emulsion of the present application is used to prepare water-in-oil emulsion under constant pressure.

[0054] Prepare 100 ml of dehydrated crude oil with a viscosity of 765.3 mPa·s and a temperature of 60℃, and place it in the crude oil storage tank 1a;

[0055] Prepare 100 ml of water and place it in the injection fluid storage tank 2a;

[0056] Inject a certain volume of crude oil in the crude oil storage tank 1a into the emulsification chamber 3 through the first constant speed and constant pressure pump 1b;

[0057] Inject a certain volume of water in the injection fluid storage tank 2a into the emulsification chamber 3 through the second constant speed and constant pressure pump 2b;

[0058] Turn on the temperature controller 72 and set the temperature of the constant temperature heating jacket 71 to 60℃;

[0059] Open the first valve 81 and adjust the pressure in the emulsification chamber 3 through the gas pressure reducing valve 83 to stabilize the pressure in the emulsification chamber 3 at 200 kPa;

[0060] Adjust the control structure 61 so that the stirring rod 62 drives the stirring paddle 63 to stir at 100 r / min for 5 min;

[0061] Open the second valve 91 to make the water-in-oil emulsion in the emulsification chamber 3 enter the collection structure 93 through the pipeline.

[0062] In practical application, according to the steps of example 1, the crude oil and water are operated according to the oil-water ratio of 3:7, 4:6, 5:5, 6:4 and 7:3 respectively, and then the average particle size of the water-in-oil emulsion obtained after changing the oil-water ratio each time is tested by using a laser particle size instrument, and the statistics are shown in Table 1.

[0063] At the same time, set Comparative Example 1, and the preparation method of the crude oil emulsion of Comparative Example 1 is as follows: take water and crude oil according to the oil-water ratio (volume ratio) of 3:7, 4:6, 5:5, 6:4 and 7:3 with a total volume of 20 ml, and place them in a 50 ml beaker. Under the condition of water bath temperature 60℃, stir at a speed of 400 r / min for 20 min, and the emulsion prepared is the water-in-oil emulsion prepared under conventional stirring conditions. After preparation, the average particle size of the water-in-oil emulsion obtained after changing the oil-water ratio each time is tested by using a laser particle size instrument, and the statistics are shown in Table 1.

[0064] Table 1 Statistics of average particle size and peak value ratio of emulsion prepared in example 1 and comparative example 1

[0065]

[0066] According to the data in Table 1, it can be concluded that the particle size of the water-in-oil emulsion prepared by operation example one is basically stable when the oil-water ratio is less than 5:5, and the particle size of the water-in-oil emulsion decreases with the increase of the oil-water ratio when the oil-water ratio is higher than 5:5, which is mainly determined by the properties of the crude oil. Since the content of active substances acting on the oil-water interface in the oil is constant at low oil-water ratio, the particle size of the formed water-in-oil emulsion is also constant. For the emulsion prepared by comparative example one, the particle size of the prepared water-in-oil emulsion increases with the decrease of the oil-water ratio, which is mainly due to the difficulty of emulsification with higher water content, and the increase of the particle size is mainly due to the insufficient emulsification.

[0067] In summary, compared with comparative example one, the emulsion prepared by operation example one under the simulated reservoir percolation environment is more uniform, and the peak value of the particle size is higher.

[0068] Operation example two, the device for preparing crude oil emulsion of the present application is used to prepare oil-in-water emulsion under constant flow rate conditions.

[0069] Prepare 100ml of dehydrated crude oil with a viscosity of 765.3mPa·s and a temperature of 60℃, and place it in the crude oil storage tank 1a;

[0070] Prepare 100ml of commercially available emulsifying oil displacement agent sodium dodecyl sulfate (SDS) aqueous solution with a concentration of 0.5%, and place it in the injection fluid storage tank 2a;

[0071] Inject a certain volume of crude oil in the crude oil storage tank 1a into the emulsification chamber 3 through the first constant speed and constant pressure pump 1b;

[0072] Inject a certain volume of emulsifying oil displacement agent solution in the injection fluid storage tank 2a into the emulsification chamber 3 through the second constant speed and constant pressure pump 2b;

[0073] Turn on the temperature controller 72 and set the temperature of the constant temperature heating jacket 71 to 60℃;

[0074] Open the first valve 81 and adjust the pressure in the emulsification chamber 3 through the gas pressure reducing valve 83 to stabilize the pressure in the emulsification chamber 3 at 500kPa;

[0075] Adjust the control structure 61 so that the stirring rod 62 drives the stirring paddle 63 to stir at 100r / min for 5min;

[0076] Set the flow rate to 0.5ml / min through the flow rate controller 92, then open the second valve 91, so that the oil-in-water emulsion in the emulsification chamber 3 enters the collection structure 93 through the pipeline.

[0077] In practical application, according to the steps of operation example two, the crude oil and the emulsified oil displacement agent solution are operated in the oil agent ratio of 3:7, 4:6, 5:5, 6:4 and 7:3 respectively, then the average particle size of the oil-in-water emulsion obtained after changing the oil agent ratio each time is tested by using the laser particle size instrument, and is counted in Table 2.

[0078] Meanwhile, the comparative example two is set, and the preparation method of the crude oil emulsion of the comparative example two is as follows: the emulsified oil displacement agent and the crude oil are taken in the oil agent ratio (volume ratio) of 3:7, 4:6, 5:5, 6:4 and 7:3 with the total volume of 20 ml, and are placed in a 50 ml beaker. The prepared emulsion is the oil-in-water emulsion prepared under the conventional stirring condition, which is prepared by stirring at the speed of 400 r / min for 20 min under the condition that the water bath temperature is 60 ℃. After the preparation is completed, the average particle size of the oil-in-water emulsion obtained after changing the oil agent ratio each time is tested by using the laser particle size instrument, and is counted in Table 2.

[0079] Table 2: The average particle size of the emulsion prepared in operation example two and comparative example two and the peak value ratio thereof

[0080]

[0081] According to the data in Table 2, it can be seen that the particle size of the crude oil emulsion formed by operation example two and comparative example two increases with the increase of the oil agent ratio, but the increasing range is different. When the oil agent ratio is lower than 6:4, the average particle size of the crude oil emulsion prepared by comparative example two is greater than that of the emulsion prepared by operation example two. However, when the oil agent ratio is higher than 6:4, the average particle size of the crude oil emulsion prepared by comparative example two is smaller than that of the emulsion prepared by operation example two, which is mainly caused by the diffusion and adsorption loss of the emulsified oil displacement agent solution in the rock pore. In the case of low oil agent ratio, the diffusion and adsorption wetting ratio of the emulsified oil displacement agent solution in the flow process is low, the ratio for emulsifying the crude oil is high, and the strong shearing action of the porous medium 5 makes the emulsion particle size small.

[0082] From the above, it can be known that, compared with comparative example two, the emulsion prepared by operation example two under the simulated reservoir percolation environment is more uniform, and the peak value ratio of the particle size is higher.

[0083] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0084] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features thereof can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An apparatus for preparing a crude oil emulsion, characterized by, The emulsion device comprises a crude oil conveying mechanism (1), an injection fluid conveying mechanism (2), an emulsification chamber (3), a sealing cover (4), a porous medium (5), a stirring mechanism (6), a heating mechanism (7), a pressure control mechanism (8) and an emulsion collecting mechanism (9). The top of the emulsification chamber (3) is detachably connected with the sealing cover (4), and the sealing cover (4) is used for opening and closing the internal space of the emulsification chamber (3). The crude oil conveying mechanism (1) and the injection fluid conveying mechanism (2) are both in communication with the inner cavity of the emulsification chamber (3). The inner cavity of the emulsification chamber (3) is provided with the porous medium (5), and the porous medium (5) is located at the bottom end of the emulsification chamber (3). The stirring mechanism (6) is fixed on the sealing cover (4), the stirring end of the stirring mechanism (6) extends into the emulsification chamber (3) through the sealing cover (4), and the stirring end of the stirring mechanism (6) is located above the porous medium (5). The heating mechanism (7) is arranged on the outer wall of the emulsification chamber (3) and can heat the fluid in the emulsification chamber (3). The pressure control mechanism (8) is in communication with the inner cavity of the emulsification chamber (3) and can adjust the pressure in the inner cavity of the emulsification chamber (3). The emulsion collecting mechanism (9) is in communication with the bottom of the emulsification chamber (3). The porous medium (5) is a rock core.

2. The apparatus for preparing a crude oil emulsion according to claim 1, characterized in that, The crude oil conveying mechanism (1) comprises a crude oil storage tank (1a) and a first constant-speed constant-pressure pump (1b). The bottom of the crude oil storage tank (1a) and the first constant-speed constant-pressure pump (1b) are in communication through a pipeline, and the top of the crude oil storage tank (1a) and the emulsification chamber (3) are in communication through a pipeline.

3. The apparatus for preparing a crude oil emulsion according to claim 2, characterized in that, The injection fluid conveying mechanism (2) comprises an injection fluid storage tank (2a) and a second constant-speed constant-pressure pump (2b). The bottom of the injection fluid storage tank (2a) and the second constant-speed constant-pressure pump (2b) are in communication through a pipeline, and the top of the injection fluid storage tank (2a) and the emulsification chamber (3) are in communication through a pipeline.

4. The apparatus for preparing a crude oil emulsion according to claim 3, characterized in that, A three-way valve (10) is further included. The first liquid inlet of the three-way valve (10) and the top of the crude oil storage tank (1a) are in communication through a pipeline, the second liquid inlet of the three-way valve (10) and the top of the injection fluid storage tank (2a) are in communication through a pipeline, and the liquid outlet of the three-way valve (10) and the emulsification chamber (3) are in communication through a pipeline.

5. The apparatus for preparing a crude oil emulsion of claim 1, wherein, The stirring mechanism (6) comprises a control structure (61), a stirring rod (62) and a stirring paddle (63). The control structure (61) is fixed on the top of the sealing cover (4). One end of the control structure (61) and the stirring rod (62) are connected, the other end of the stirring rod (62) is connected with the stirring paddle (63) after penetrating through the sealing cover (4), and the axis of the stirring rod (62) is parallel to the axis of the emulsification chamber (3). The stirring paddle (63) is located above the porous medium (5).

6. The apparatus for preparing a crude oil emulsion of claim 1, wherein, The heating mechanism (7) comprises a constant-temperature heating sleeve (71) and a temperature controller (72). The constant temperature heating jacket (71) is sleeved on the outer wall of the emulsification chamber (3), and the constant temperature heating jacket (71) is electrically connected with the temperature controller (72).

7. The apparatus for preparing a crude oil emulsion of claim 1, wherein, The pressure control mechanism (8) comprises a first valve (81), a pressure gauge (82), a gas pressure reducing valve (83) and a high-pressure gas cylinder (84). The high-pressure gas cylinder (84) and the emulsification chamber (3) are communicated through a pipeline, and the gas pressure reducing valve (83), the pressure gauge (82) and the first valve (81) are arranged on the pipeline between the high-pressure gas cylinder (84) and the emulsification chamber (3).

8. The apparatus for preparing a crude oil emulsion of claim 1, wherein, The emulsion collecting mechanism (9) comprises a second valve (91), a flow rate controller (92) and a collecting structure (93). The collecting structure (93) and the emulsification chamber (3) are communicated through a pipeline, and the flow rate controller (92) and the second valve (91) are arranged on the pipeline between the collecting structure (93) and the emulsification chamber (3).

9. A method of using an apparatus for preparing an emulsion of crude oil, characterized in that, The use of the device for preparing crude oil emulsion according to any one of claims 1-8 comprises: Injecting a certain volume of crude oil into the inner cavity of the emulsification chamber (3) through the crude oil conveying mechanism (1); Injecting a certain volume of injection fluid into the inner cavity of the emulsification chamber (3) through the injection fluid conveying mechanism (2); Turning on the heating mechanism (7) to heat the fluid in the inner cavity of the emulsification chamber (3); Turning on the pressure control mechanism (8) to adjust the pressure in the inner cavity of the emulsification chamber (3) to a required value; Turning on the stirring mechanism (6) to stir the fluid above the porous medium (5); Turning on the emulsion collecting mechanism (9) to collect the crude oil emulsion flowing through the porous medium (5).

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