CN113967426A - Visual carbon dioxide fracturing sand mixing device and method - Google Patents
Visual carbon dioxide fracturing sand mixing device and method Download PDFInfo
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- CN113967426A CN113967426A CN202010723932.4A CN202010723932A CN113967426A CN 113967426 A CN113967426 A CN 113967426A CN 202010723932 A CN202010723932 A CN 202010723932A CN 113967426 A CN113967426 A CN 113967426A
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Abstract
The invention discloses a visual carbon dioxide fracturing sand mixing device and a visual carbon dioxide fracturing sand mixing method, wherein the visual carbon dioxide fracturing sand mixing device comprises the following steps: the sand mixing tank comprises a transparent cylinder and a pair of joints, the pair of joints respectively seal two ends of the transparent cylinder, one joint is provided with a liquid inlet and a sand inlet, and the other joint is provided with a discharge outlet; the pair of turbines are arranged in the sand mulling tank and are respectively positioned at two ends of the transparent cylinder body, the pair of turbines are in transmission connection through a turbine shaft, and the turbine shaft is positioned on the axis of the transparent cylinder body. The device can avoid the sand setting phenomenon in the pipe, has visibility, is simple in structure, convenient and efficient, and has good popularization prospect.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to a visual carbon dioxide fracturing sand mixing device and method.
Background
The liquid carbon dioxide fracturing is an anhydrous fracturing technology which replaces conventional hydraulic fracturing fluid with carbon dioxide, and domestic and foreign practical achievements show that the liquid carbon dioxide fracturing has very obvious fracturing modification effects on low-pressure, low-permeability, strong water lock and water-sensitive reservoirs. The main technical difficulty of carbon dioxide fracturing is that the sand mixing equipment used in conventional fracturing cannot meet the operation requirement, and special closed sand mixing equipment needs to be developed. Therefore, the sand mixing device is the core equipment for the construction of the liquid carbon dioxide fracturing process.
At present, the closed sand mixing equipment mainly has two types: the method is characterized in that the leakproofness of sand mixing equipment in the conventional fracturing process is upgraded. For example, in the patent "liquid carbon dioxide dry sand fracturing system and process flow (CN 201812081566.4)" and "a closed sand mixer (CN 201720033541.3)" applied by yanyangthan (2017), a traditional horizontal tank is adopted to mix and output a fracturing fluid and a proppant in a fixed ratio in a closed environment; in a pressurized sand mixing device (CN201710650568.1) applied by Wangyantong (2017) for oilfield fracturing, a vertical tank is adopted to be matched with a stirrer to realize the mixing and conveying of sand-carrying liquid. ② an injection type sand mixing tank or a sand mixing pipe based on Venturi principle. For example, the document "liquid CO based on CFD" published in the Marseh (2018)2The action mechanism and the design parameters of the closed sand mixer are explained in the structural parameter design; in the patent "jet mixing tank (CN201721356655.8) suitable for sand mixing equipment" applied to Penping (2017), an injection pipe is adopted to inject light into the inner side of the tank wallThe flow pipe is matched with the stirrer to realize the uniform mixing of the sand-carrying liquid and reduce the power. However, the existing sand mixing devices adopted on the site are invisible, the mixing condition of the sand carrying liquid cannot be directly observed, and whether the sand settling phenomenon in the manifold occurs or not cannot be known, so that the adjustment of the subsequent process cannot be accurately made.
Therefore, a more reasonable and reliable visual carbon dioxide fracturing sand mixing device and method are expected to be developed, and support is provided for popularization of the liquid carbon dioxide fracturing technology.
Disclosure of Invention
The invention aims to solve the problems that the mixing condition of a sand carrying liquid cannot be directly observed, whether sand settling phenomenon in a manifold occurs cannot be known, and subsequent procedure adjustment cannot be accurately performed in the conventional liquid carbon dioxide fracturing, and provides a visual carbon dioxide fracturing sand mixing device and a visual carbon dioxide fracturing sand mixing method, which have visibility and are convenient for observing the state of the sand carrying liquid, so that the construction condition is fed back more truly and objectively, the mixing degree of liquid carbon dioxide and a propping agent is improved, equipment is simplified, the reliability is improved, and sand settling in a pipe is avoided.
In order to achieve the above object, the present invention provides a visual carbon dioxide fracturing sand mixing device, comprising:
the sand mixing tank comprises a transparent cylinder and a pair of joints, the pair of joints respectively seal two ends of the transparent cylinder, one of the joints is provided with a liquid inlet and a sand inlet, and the other joint is provided with a discharge outlet;
the pair of turbines are arranged in the sand mixing tank and are respectively positioned at two ends of the transparent cylinder body, the pair of turbines are in transmission connection through a turbine shaft, and the turbine shaft is positioned on the axis of the transparent cylinder body.
Optionally, a vacuum interlayer is arranged in the wall of the transparent cylinder, and a hydrophobic coating covers the outer surface of the transparent cylinder.
Optionally, the transparent cylinder is connected with the joint through a thread, and a sealing ring is arranged in a twisted tooth of the thread.
Optionally, the turbine includes a shaft sleeve, an outer ring and a plurality of blades, the outer ring is sleeved outside the shaft sleeve and is coaxial with the shaft sleeve, the plurality of blades are connected between the shaft sleeve and the outer ring along a radial direction of the outer ring, the shaft sleeve is sleeved on the turbine shaft, and the outer ring is connected to an inner wall of the joint through a bearing.
Optionally, the transparent cylinder is made of glass fiber reinforced plastic, the joint is made of steel, and the turbine is integrally formed with the joint.
Optionally, the axes of the liquid inlet, the sand inlet and the discharge port are parallel to the axis of the transparent cylinder.
The invention also provides a carbon dioxide fracturing sand mixing method, which utilizes the visual carbon dioxide fracturing sand mixing device and comprises the following steps:
1) installing a visual carbon dioxide fracturing sand mixing device;
2) injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet, so that the liquid carbon dioxide is formed in the sand mixing tank to flow, and the turbine is pushed to rotate;
3) conveying a propping agent into the sand mixing tank from a sand inlet, and enabling the propping agent to be in contact with and mixed with liquid carbon dioxide under the action of a turbine;
4) the sand-carrying liquid is discharged from the discharge hole.
Optionally, the step 1) includes:
1.1) arranging a fixing device on the ground;
1.2) installing the transparent cylinder on a fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3) installing a joint and a turbine shaft;
1.4) connecting the liquid inlet, the sand inlet and the discharge port with corresponding pipelines, and ensuring that the axes of the liquid inlet, the sand inlet and the discharge port coincide with the axes of the pipelines during connection.
Optionally, the step 2) includes:
2.1) slowly injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet until the temperature and the pressure in the sand mixing tank reach critical values, and generating stable liquid carbon dioxide;
2.2) opening the liquid outlet, forming liquid carbon dioxide in the sand mixing tank to flow, gradually increasing the discharge capacity to the designed fracturing discharge capacity, and pushing the turbine to rotate.
Optionally, the step 3) includes:
3.1) conveying the proppant into the sand mixing tank from the sand inlet, so that the proppant passes through a turbine close to the sand inlet under the carrying of liquid carbon dioxide, and the proppant and the liquid carbon dioxide are stirred and mixed for the first time;
3.2) the sand-carrying liquid flows to the discharge port and passes through a turbine close to the discharge port to be mixed and stirred for the second time.
The invention has the beneficial effects that: the sand mixing tank adopts a transparent cylinder body, so that the state of the sand carrying liquid can be conveniently observed, and the feedback on the construction condition is more real and objective; the turbine is arranged in the sand mixing tank, so that the turbine is started through water power, a traditional stirring rod is not needed, external equipment is not introduced, energy input is not needed, the equipment is simplified, and the reliability of the equipment is improved; the device can improve the mixing effect of the propping agent and the liquid carbon dioxide, and avoids the phenomenon of sand setting in the manifold. The novel multifunctional electric heating cooker is simple in structure, convenient, fast and efficient, and has good popularization prospect.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of a visual carbon dioxide fracturing blender according to an embodiment of the invention.
Fig. 2 shows a cross-sectional view a-a of fig. 1.
Description of the reference numerals
1. A sand inlet; 2. a liquid inlet; 3. a joint; 4. a bearing; 5. a turbine; 6. a turbine shaft; 7. a discharge port; 8. a blade; 9. vacuum interlayer; 10. a transparent cylinder.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The invention discloses a visual carbon dioxide fracturing sand mixing device, which comprises:
the sand mixing tank comprises a transparent cylinder and a pair of joints, the pair of joints respectively seal two ends of the transparent cylinder, one joint is provided with a liquid inlet and a sand inlet, and the other joint is provided with a discharge outlet;
the pair of turbines are arranged in the sand mulling tank and are respectively positioned at two ends of the transparent cylinder body, the pair of turbines are in transmission connection through a turbine shaft, and the turbine shaft is positioned on the axis of the transparent cylinder body.
Specifically, the sand mixing tank adopts a transparent cylinder body, so that the state of the sand carrying liquid is convenient to observe, and the feedback of the construction condition is more real and objective; the turbine is arranged in the sand mixing tank, so that the turbine is started through water power, a traditional stirring rod is not needed, external equipment is not introduced, energy input is not needed, the equipment is simplified, and the reliability of the equipment is improved; the device can improve the mixing effect of the propping agent and the liquid carbon dioxide, and avoids the phenomenon of sand setting in the manifold. The novel multifunctional electric heating cooker is simple in structure, convenient, fast and efficient, and has good popularization prospect.
Further, the sand mixing device also comprises a thermometer, a pressure gauge and a flowmeter, which are arranged in the sand mixing tank and used for measuring the temperature and the pressure in the tank and monitoring the flow.
As an alternative scheme, a vacuum interlayer is arranged in the wall of the transparent cylinder, and the outer surface of the transparent cylinder is covered with a hydrophobic coating.
Specifically, set up the vacuum intermediate layer as observation window, can effectively avoid the barrel surface that the heat transfer caused to freeze and lead to unable observation, at glass barrel external surface spraying hydrophobic coating simultaneously, the comdenstion water enriches in the surface during the construction can be avoided, blocks the sight, the result of unable observation.
As an alternative, the transparent cylinder body is connected with the joint through threads, and the thread teeth of the threads are internally provided with sealing rings.
Specifically, the joint is connected with the transparent cylinder through threads, and the threads are provided with the built-in sealing rings, so that the liquid carbon dioxide of the sand mixing tank can be ensured not to leak under the construction pressure (usually 2 MPa-18 ℃).
As an alternative scheme, the turbine comprises a shaft sleeve, an outer ring and a plurality of blades, the outer ring is sleeved on the outer side of the shaft sleeve and is coaxial with the shaft sleeve, the plurality of blades are connected between the shaft sleeve and the outer ring along the radial direction of the outer ring, the shaft sleeve is sleeved on the turbine shaft, and the outer ring is connected to the inner wall of the joint through a bearing.
Specifically, the turbine can be additionally arranged in the transparent cylinder body according to requirements, the size of the turbine arranged here is required to be smaller than the inner diameter of the transparent cylinder body, the turbine is not in contact with the inner surface of the transparent cylinder body, and the turbine is only used for strengthening the stirring function.
Alternatively, the transparent cylinder is made of glass fiber reinforced plastic, the joint is made of steel, and the turbine is integrally formed with the joint.
Specifically, the material of the transparent cylinder can be selected according to the requirement, and is not limited to the glass fiber reinforced plastics mentioned in the application; the material of the joint may also be selected as desired and is not limited to the steel mentioned in this application.
The turbine and the joint are integrally formed, and the turbines at two ends of the transparent cylinder body are connected through the turbine shaft during installation, so that the structure and the installation steps are simplified.
As an alternative, the axes of the liquid inlet, the sand inlet and the discharge port are parallel to the axis of the transparent cylinder.
Specifically, the axis of inlet, sand inlet and discharge gate is parallel with the axis of transparent barrel, can avoid the flow direction of liquid and proppant to form the moment of torsion and initiate the frontal stress, causes equipment to damage.
The invention also discloses a carbon dioxide fracturing sand mixing method, which utilizes the visual carbon dioxide fracturing sand mixing device and comprises the following steps:
1) installing a visual carbon dioxide fracturing sand mixing device;
2) injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet, so that the liquid carbon dioxide is formed in the sand mixing tank to flow, and the turbine is pushed to rotate;
3) conveying a propping agent into the sand mixing tank from a sand inlet, and enabling the propping agent to be in contact with and mixed with liquid carbon dioxide under the action of a turbine;
4) the sand-carrying liquid is discharged from the discharge hole.
Specifically, the method is used for fracturing and sand mixing of the carbon dioxide, so that the state of the sand carrying liquid can be conveniently observed, the feedback on the construction condition is more real and objective, the mixing effect of the propping agent and the liquid carbon dioxide can be improved, and the sand settling phenomenon in a manifold is avoided;
furthermore, the mixing state of the liquid carbon dioxide and the propping agent can be observed at the transparent cylinder, the flow state of the sand-carrying liquid can be observed at the same time, and the adjustment of the subsequent procedures can be carried out according to the observation result.
Alternatively, step 1) comprises:
1.1) arranging a fixing device on the ground;
1.2) installing the transparent cylinder on a fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3) installing a joint and a turbine shaft;
1.4) connecting the liquid inlet, the sand inlet and the discharge port with corresponding pipelines, and ensuring that the axes of the liquid inlet, the sand inlet and the discharge port coincide with the axes of the pipelines during connection.
Specifically, the main body function of the visual carbon dioxide fracturing sand mixing device is realized through the transparent cylinder, and the material attribute is high strength and high brittleness, so that the device is not suitable for bearing external stress and torque, a fixing device is arranged on the ground in advance during installation of the device, and the device is ensured not to bear external stress after the transparent cylinder is fixed.
Furthermore, the axes of the liquid inlet, the sand inlet and the discharge port are coincident with the axis of the pipeline during connection, so that the frontal stress caused by torque is avoided, and the equipment is prevented from being damaged.
Alternatively, step 2) comprises:
2.1) slowly injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet until the temperature and the pressure in the sand mixing tank reach critical values, and generating stable liquid carbon dioxide;
2.2) opening the liquid outlet, forming liquid carbon dioxide in the sand mixing tank to flow, gradually increasing the discharge capacity to the designed fracturing discharge capacity, and pushing the turbine to rotate.
Specifically, the liquid carbon dioxide at the initial stage of injection is gasified in a low-pressure high-temperature environment, the temperature in the sand mulling tank is gradually reduced, the pressure is increased, the liquid carbon dioxide is continuously and slowly injected until the temperature and the pressure reach critical values, and stable liquid carbon dioxide appears; it should be noted that the injection cannot be performed quickly in the process, and a sudden temperature drop is caused so as not to damage the glass fiber reinforced plastic cylinder body.
Further, liquid carbon dioxide is conveyed into the cylinder through the liquid inlet, the turbine is driven to rotate by hydrodynamic force generated by the liquid carbon dioxide flowing on the surface of the impeller, and the liquid flows in a vortex shape and a turbulent flow shape under the influence of the rotation of the turbine.
Alternatively, step 3) comprises:
3.1) conveying the proppant into the sand mixing tank from the sand inlet, so that the proppant passes through a turbine close to the sand inlet under the carrying of liquid carbon dioxide, and the proppant and the liquid carbon dioxide are stirred and mixed for the first time;
3.2) the sand-carrying liquid flows to the discharge port and passes through a turbine close to the discharge port to be mixed and stirred for the second time.
Specifically, when the proppant passes through the turbine close to the sand inlet under the carrying of the liquid carbon dioxide, the rotation of the turbine promotes the proppant to be stirred and mixed with the liquid carbon dioxide for the first time; after passing through the turbine, the liquid flows in a turbulent flow state, so that the sand carrying capacity is improved, meanwhile, a vortex is formed under the action of the turbine, the mixing degree with the proppant is further improved, and the phenomenon of sand deposition in the pipe can not occur in the transportation process of the proppant under the dual effects of the vortex and the turbulent flow; the sand-carrying liquid is transported to the liquid outlet and contacts with a turbine close to the liquid outlet to carry out secondary mixing and stirring, so that the sand blocking phenomenon caused by proppant sedimentation is effectively avoided.
If the turbine shaft in the transparent cylinder body is additionally provided with the impeller, the additional stirring function of the sand-carrying liquid can be added, and the sand-carrying performance of the liquid carbon dioxide is further improved.
Examples
Fig. 1 shows a schematic diagram of a visual carbon dioxide fracturing blender of the present embodiment; fig. 2 shows a cross-sectional view a-a of fig. 1.
As shown in fig. 1 and 2, the sand mixing tank comprises a transparent cylinder 10 and a pair of joints 3, the transparent cylinder 10 is made of glass fiber reinforced plastic, a vacuum interlayer 9 is arranged in the cylinder wall, and the outer surface of the transparent cylinder 10 is covered with a hydrophobic coating; the pair of connectors 3 are made of steel, the two ends of the transparent cylinder 10 are respectively sealed, the connectors are connected with the transparent cylinder 10 through threads, sealing rings are arranged in twisted teeth of the threads, a liquid inlet 2 and a sand inlet 1 are arranged on one connector 3, a discharge port 7 is arranged on the other connector 3, and the axial lines of the liquid inlet 2, the sand inlet 1 and the discharge port 7 are parallel to the axial line of the transparent cylinder 10;
the turbine 5 comprises a shaft sleeve, an outer ring and a plurality of blades 8, the outer side of the shaft sleeve is sleeved with the outer ring and is coaxial with the shaft sleeve, the blades are radially connected between the shaft sleeve and the outer ring along the outer ring of 8, the shaft sleeve is sleeved on the turbine shaft 6, the outer ring is connected to the inner wall of the joint 3 through the bearing 4, the turbine 5 and the joint 3 are integrally formed, a pair of vortexes at two ends of the sand mixing tank are in transmission connection through the turbine shaft 6, and the turbine shaft 6 is located on the axis of the transparent barrel 10.
Wherein, still include thermometer, pressure gauge and flowmeter among the mulling device, set up in the mulling jar for measure jar interior temperature and pressure, and monitor the flow.
The device improves the mixing degree of the sand-carrying liquid by arranging the transparent cylinder and the turbine and manufacturing the vortex in the pipeline through hydrodynamic force, does not need a traditional stirring rod, does not introduce external equipment or input energy, simplifies equipment, improves reliability and avoids imagination of sand setting in the pipeline; meanwhile, the visual sand carrier has visibility, is convenient to observe the state of the sand carrier, and has more real and objective feedback on construction.
The carbon dioxide fracturing sand mixing method comprises the following steps:
1) arranging a fixing device on the ground;
2) the transparent cylinder is arranged on the fixing device, the axis of the transparent cylinder is kept horizontal, and the transparent cylinder is ensured not to bear external stress after being arranged;
3) installing a joint and a turbine shaft, and enabling the turbine shaft to be in transmission connection between turbines at two ends of the transparent cylinder;
4) the liquid inlet, the sand inlet and the discharge port are connected with corresponding pipelines, and the axes of the liquid inlet, the sand inlet and the discharge port are ensured to coincide with the axes of the pipelines during connection.
5) Slowly injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet until the temperature and the pressure in the sand mixing tank reach critical values, and ensuring that stable liquid carbon dioxide appears, wherein the stable liquid carbon dioxide cannot be quickly injected in the process to cause temperature shock so as to avoid damaging the glass fiber reinforced plastic cylinder body;
6) opening the liquid outlet to enable liquid carbon dioxide formed in the sand mixing tank to flow, gradually increasing the discharge capacity to the fracturing design discharge capacity, and pushing the turbine to rotate; at the moment, the liquid carbon dioxide flows on the surface of the impeller to generate hydrodynamic force to push the turbine to rotate, and the liquid flows in a vortex shape and a turbulent flow form under the influence of the rotation of the turbine;
7) conveying the proppant into the sand mixing tank from the sand inlet, so that the proppant passes through the turbine close to the sand inlet under the carrying of the liquid carbon dioxide, the proppant and the liquid carbon dioxide are stirred and mixed for the first time, and the liquid flows in a turbulent state after passing through the turbine, so that the sand carrying capacity is improved, and meanwhile, a vortex is formed under the action of the turbine, the mixing degree with the proppant is further improved, and the phenomenon of sand setting in the pipe cannot occur in the transportation process of the proppant under the double effects of the vortex and the turbulent flow;
8) the sand-carrying liquid flows to the discharge port and passes through the turbine close to the discharge port to be mixed and stirred for the second time, so that the sand blocking phenomenon caused by proppant sedimentation is effectively avoided.
9) The sand-carrying liquid is discharged from a discharge port, and the discharge port is connected with a manifold and is finally pumped into a wellhead by a pump truck under pressure.
The transparent cylinder is arranged, so that the state of the sand-carrying liquid can be conveniently observed, the feedback of the construction condition is more real and objective, the turbines are arranged at the two ends of the cylinder, and the hydraulic starting is realized, so that the traditional stirring rod is not needed, no external equipment is introduced, no energy input is needed, the equipment is simplified, and the reliability is improved; meanwhile, the mixing effect of the propping agent and the liquid carbon dioxide is improved, and the phenomenon of sand setting in the manifold is effectively avoided.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a visual carbon dioxide fracturing sand mulling device which characterized in that includes:
the sand mixing tank comprises a transparent cylinder and a pair of joints, the pair of joints respectively seal two ends of the transparent cylinder, one of the joints is provided with a liquid inlet and a sand inlet, and the other joint is provided with a discharge outlet;
the pair of turbines are arranged in the sand mixing tank and are respectively positioned at two ends of the transparent cylinder body, the pair of turbines are in transmission connection through a turbine shaft, and the turbine shaft is positioned on the axis of the transparent cylinder body.
2. The visual carbon dioxide fracturing sand mixing device according to claim 1, wherein a vacuum interlayer is arranged in the wall of the transparent cylinder, and the outer surface of the transparent cylinder is covered with a hydrophobic coating.
3. The visual carbon dioxide fracturing sand mixing device according to claim 1, wherein the transparent cylinder body is connected with the joint through threads, and a sealing ring is arranged in a twisted thread of the threads.
4. The visual carbon dioxide fracturing sand mixing device according to claim 1, wherein the turbine comprises a shaft sleeve, an outer ring and a plurality of blades, the outer ring is sleeved outside the shaft sleeve and is coaxial with the shaft sleeve, the plurality of blades are connected between the shaft sleeve and the outer ring along the radial direction of the outer ring, the shaft sleeve is sleeved on the turbine shaft, and the outer ring is connected to the inner wall of the joint through a bearing.
5. The visual carbon dioxide fracturing blender as claimed in claim 4, wherein the transparent cylinder is made of glass fiber reinforced plastic, the joint is made of steel, and the turbine is integrally formed with the joint.
6. The visual carbon dioxide fracturing sand mixing device according to claim 1, wherein the axes of the liquid inlet, the sand inlet and the sand outlet are parallel to the axis of the transparent cylinder.
7. A carbon dioxide fracturing sand mulling method using the visual carbon dioxide fracturing sand mulling device according to any one of claims 1 to 6, wherein the method comprises the following steps:
1) installing a visual carbon dioxide fracturing sand mixing device;
2) injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet, so that the liquid carbon dioxide is formed in the sand mixing tank to flow, and the turbine is pushed to rotate;
3) conveying a propping agent into the sand mixing tank from a sand inlet, and enabling the propping agent to be in contact with and mixed with liquid carbon dioxide under the action of a turbine;
4) the sand-carrying liquid is discharged from the discharge hole.
8. The carbon dioxide fracturing sand mulling method as recited in claim 7, wherein the step 1) comprises:
1.1) arranging a fixing device on the ground;
1.2) installing the transparent cylinder on a fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3) installing a joint and a turbine shaft;
1.4) connecting the liquid inlet, the sand inlet and the discharge port with corresponding pipelines, and ensuring that the axes of the liquid inlet, the sand inlet and the discharge port coincide with the axes of the pipelines during connection.
9. The carbon dioxide fracturing sand mulling method as recited in claim 7, wherein the step 2) comprises:
2.1) slowly injecting liquid carbon dioxide into the sand mixing tank from the liquid inlet until the temperature and the pressure in the sand mixing tank reach critical values, and generating stable liquid carbon dioxide;
2.2) opening the liquid outlet, forming liquid carbon dioxide in the sand mixing tank to flow, gradually increasing the discharge capacity to the designed fracturing discharge capacity, and pushing the turbine to rotate.
10. The carbon dioxide fracturing sand mulling method as recited in claim 7, wherein the step 3) comprises:
3.1) conveying the proppant into the sand mixing tank from the sand inlet, so that the proppant passes through a turbine close to the sand inlet under the carrying of liquid carbon dioxide, and the proppant and the liquid carbon dioxide are stirred and mixed for the first time;
3.2) the sand-carrying liquid flows to the discharge port and passes through a turbine close to the discharge port to be mixed and stirred for the second time.
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