CN113967426B - 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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- CN113967426B CN113967426B CN202010723932.4A CN202010723932A CN113967426B CN 113967426 B CN113967426 B CN 113967426B CN 202010723932 A CN202010723932 A CN 202010723932A CN 113967426 B CN113967426 B CN 113967426B
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Abstract
The invention discloses a visual carbon dioxide fracturing sand mixing device and method, comprising the following steps: the sand mixing tank comprises a transparent cylinder body and a pair of connectors, wherein the connectors are used for respectively sealing two ends of the transparent cylinder body, one connector is provided with a liquid inlet and a sand inlet, and the other connector is provided with a discharge hole; the turbine shafts are connected through turbine shaft transmission and are positioned on the axis of the transparent cylinder. The device can avoid sand setting phenomenon in the pipe, has visibility, and has simple structure, convenience, high efficiency and 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 the conventional hydraulic fracturing fluid with carbon dioxide, and practical achievements at home and abroad show that the liquid carbon dioxide fracturing has obvious fracturing reconstruction effects on low pressure, low permeability, strong water lock and water sensitive reservoirs. The main technical difficulty of carbon dioxide fracturing is that sand mixing equipment used for conventional fracturing cannot meet the operation requirement, and special closed sand mixing equipment needs to be developed. Therefore, the sand mixing device is core equipment for the construction of the liquid carbon dioxide fracturing process.
At present, the airtight sand mixing equipment mainly has two categories: (1) the sealing is updated by sand mixing equipment in the conventional fracturing process. For example, in the patent "liquid carbon dioxide dry sand fracturing system and process flow (CN 201812081566.4)", "a closed sand mixing device (CN 201720033541.3)", which is applied by Yang Yanzeng (2017), a conventional horizontal tank is adopted to realize the mixing and output of the fracturing fluid and the propping agent in a fixed proportion in a closed environment; wang Yadong (2017) discloses a pressurized sand mixing device (CN 201710650568.1) for oilfield fracturing, wherein a vertical tank is matched with a stirrer to realize mixed conveying of sand-carrying fluid. (2) Jet type sand mixing tank or pipe based on venturi principle. As published in Ma Weiguo (2018), "CFD-based liquid CO 2 The mechanism of action and the design parameters of the closed sand mixer are explained in the design of the structural parameters of the closed sand mixer; in the patent "injection type mixing tank (CN 201721356655.8) suitable for sand mixing equipment" applied by Peng Pingsheng (2017), injection pipes are used to connect injection pipes to the inner side of the tank wall to match with a stirrer so as to realize uniform mixing of sand-carrying fluid and reduce power. However, at present, all the sand mixing equipment adopted on the site is invisible, the mixing condition of sand-carrying fluid cannot be directly observed, whether the phenomenon of sand setting in a manifold occurs cannot be known, and therefore, the adjustment of subsequent procedures cannot be accurately made.
Therefore, development of a more reasonable and reliable visual carbon dioxide fracturing sand mixing device and method is expected to provide support for popularization of liquid carbon dioxide fracturing technology.
Disclosure of Invention
The invention aims to provide a visual carbon dioxide fracturing sand mixing device and method which have visibility and are convenient for observing the state of sand carrying fluid, aiming at the problems that the mixing condition of the sand carrying fluid cannot be directly observed, whether the sand settling phenomenon in a manifold can occur cannot be known, and the subsequent process adjustment cannot be accurately carried out in the conventional liquid carbon dioxide fracturing, so that the construction condition is fed back more truly and objectively, the mixing degree of the liquid carbon dioxide and a propping agent is improved, equipment is simplified, the reliability is improved, and the sand settling in the 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 body and a pair of connectors, wherein the connectors are used for respectively sealing two ends of the transparent cylinder body, one connector is provided with a liquid inlet and a sand inlet, and the other connector is provided with a discharge hole;
the turbine shafts are connected through turbine shaft transmission and are positioned on the axis of the transparent cylinder.
Optionally, 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.
Optionally, the transparent cylinder is connected with the connector through threads, and sealing rings are arranged in the threads of the threads.
Optionally, the turbine includes axle sleeve, outer loop and a plurality of blade, the outer loop cover is located the outside of axle sleeve and with the axle sleeve is coaxial, a plurality of blades along the radial of outer loop connect in the axle sleeve with between the outer loop, the axle sleeve cover is located on the turbine shaft, the outer loop pass through the bearing connect in the inner wall of joint.
Optionally, the transparent cylinder is made of glass fiber reinforced plastic, the joint is made of steel, and the turbine and the joint are integrally formed.
Optionally, the axes of the liquid inlet, the sand inlet and the discharge outlet are parallel to the axis of the transparent cylinder.
The invention also provides a carbon dioxide fracturing sand mixing method, which utilizes the visualized 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 through the liquid inlet to enable the liquid carbon dioxide to flow in the sand mixing tank so as to push the turbine to rotate;
3) Conveying propping agent into the sand mixing tank through the sand inlet, so that the propping agent is contacted and mixed with the liquid carbon dioxide under the action of the turbine;
4) And the sand-carrying liquid is discharged from the discharge port.
Optionally, the step 1) includes:
1.1 A fixing device is arranged on the ground;
1.2 Mounting the transparent cylinder on the fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3 Mounting a joint and a turbine shaft;
1.4 Connecting the liquid inlet, the sand inlet and the discharge outlet with corresponding pipelines, and ensuring that the axes of the liquid inlet, the sand inlet and the discharge outlet are coincident 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 to enable liquid carbon dioxide to flow in the sand mixing tank, gradually increasing the discharge capacity to the fracturing design discharge capacity, and pushing the turbine to rotate.
Optionally, the step 3) includes:
3.1 Conveying the propping agent into the sand mixing tank through the sand inlet, so that the propping agent passes through a turbine close to the sand inlet under the carrying of the liquid carbon dioxide, and the propping agent and the liquid carbon dioxide are stirred and mixed for the first time;
3.2 The sand-carrying fluid flows to the discharge port and passes through the turbine close to the discharge port to be mixed and stirred secondarily.
The invention has the beneficial effects that: the sand mixing tank adopts a transparent cylinder body, so that the state of sand carrying fluid 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 hydrodynamic property, a traditional stirring rod is not needed, external equipment is not needed, energy input is not needed, equipment is simplified, and the reliability of the equipment is improved; by utilizing the device, the mixing effect of the propping agent and the liquid carbon dioxide can be improved, and the phenomenon of sand setting in the manifold is avoided. The novel portable intelligent control device is simple in structure, convenient 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 foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 shows a schematic diagram of a visual carbon dioxide fracturing sand mixing device according to one embodiment of the invention.
Figure 2 shows a section A-A of figure 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 preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to 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 should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
The invention discloses a visual carbon dioxide fracturing sand mixing device, which comprises:
the sand mixing tank comprises a transparent cylinder body and a pair of connectors, wherein the connectors are used for respectively sealing two ends of the transparent cylinder body, one connector is provided with a liquid inlet and a sand inlet, and the other connector is provided with a discharge hole;
the turbine shafts are connected through turbine shaft transmission and are positioned on the axis of the transparent cylinder.
Specifically, the sand mixing tank adopts a transparent cylinder body, so that the state of sand carrying fluid can be conveniently observed, and 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 hydrodynamic property, a traditional stirring rod is not needed, external equipment is not needed, energy input is not needed, equipment is simplified, and the reliability of the equipment is improved; by utilizing the device, the mixing effect of the propping agent and the liquid carbon dioxide can be improved, and the phenomenon of sand setting in the manifold is avoided. The novel portable intelligent control device is simple in structure, convenient 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 are used for measuring the temperature and the pressure in the tank and monitoring the flow.
As an alternative, 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, the vacuum interlayer is arranged as an observation window, so that the phenomenon that the surface of the cylinder body is frozen and cannot be observed due to heat transfer can be effectively avoided, meanwhile, the hydrophobic coating is sprayed on the outer surface of the glass cylinder body, condensed water is prevented from being enriched on the surface during construction, the sight is blocked, and the observation result cannot be observed.
As an alternative scheme, the transparent cylinder body is connected with the connector through threads, and sealing rings are arranged in screw threads.
Specifically, the joint is connected with the transparent cylinder body through threads, and the sealing rings are arranged in the thread teeth, so that the liquid carbon dioxide of the sand mixing tank can be ensured not to leak under the construction pressure (usually 2MPa and 18 ℃).
As an alternative scheme, the turbine includes axle sleeve, outer loop and a plurality of blade, and the outside of axle sleeve is located to the outer loop cover and coaxial with the axle sleeve, and a plurality of blades are connected between axle sleeve and outer loop along the radial of outer loop, and the axle sleeve cover is located on the turbine axle, and the outer loop passes through the bearing and connects in the inner wall of joint.
Specifically, the turbine can be arranged in the transparent cylinder according to the requirement, the size of the turbine arranged in the transparent cylinder is smaller than the inner diameter of the transparent cylinder, and the turbine is not contacted with the inner surface of the transparent cylinder and only serves as a stirring strengthening function.
Alternatively, the transparent cylinder is made of glass fiber reinforced plastic, the joint is made of steel, and the turbine and the joint are integrally formed.
Specifically, the material of the transparent cylinder can be selected according to the needs, and is not limited to the glass fiber reinforced plastic mentioned in the application; the material of the joint may be selected as required, and is not limited to the steel mentioned in the present application.
The turbine and the joint are integrally formed, and the turbines at the two ends of the transparent cylinder body are connected only 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 outlet are parallel to the axis of the transparent cylinder.
Specifically, the axes of the liquid inlet, the sand inlet and the discharge outlet are parallel to the axis of the transparent cylinder, so that the problem that the equipment is damaged due to the fact that torque is formed in the flowing direction of the liquid and the propping agent to cause additional stress is avoided.
The invention also discloses a carbon dioxide fracturing sand mixing method, which comprises the following steps of:
1) Installing a visual carbon dioxide fracturing sand mixing device;
2) Injecting liquid carbon dioxide into the sand mixing tank through the liquid inlet to enable the liquid carbon dioxide to flow in the sand mixing tank so as to push the turbine to rotate;
3) Conveying propping agent into the sand mixing tank through the sand inlet, so that the propping agent is contacted and mixed with the liquid carbon dioxide under the action of the turbine;
4) And the sand-carrying liquid is discharged from the discharge port.
Specifically, the method is used for carrying out carbon dioxide fracturing sand mixing, so that the state of sand carrying fluid is convenient to observe, feedback on construction conditions is more real and objective, the mixing effect of propping agent and liquid carbon dioxide can be improved, and the phenomenon of sand setting in a manifold is avoided;
further, the mixing state of the liquid carbon dioxide and the propping agent can be observed at the transparent cylinder, meanwhile, the flow state of the sand-carrying fluid can be observed, and the subsequent process can be adjusted according to the observation result.
Alternatively, step 1) includes:
1.1 A fixing device is arranged on the ground;
1.2 Mounting the transparent cylinder on the fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3 Mounting a joint and a turbine shaft;
1.4 The liquid inlet, the sand inlet and the discharge outlet are connected with corresponding pipelines, and the axes of the liquid inlet, the sand inlet and the discharge outlet are ensured to 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 property is high strength and high brittleness, so that the visual carbon dioxide fracturing sand mixing device is not suitable for bearing external stress and torque, a fixing device is arranged on the ground in advance during installation, and the external stress is not born after the transparent cylinder is fixed.
Further, the axes of the liquid inlet, the sand inlet and the discharge outlet are ensured to coincide with the axes of the pipelines during connection, so that the phenomenon that additional stress is caused by torque is avoided, and equipment is damaged.
Alternatively, 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 to enable liquid carbon dioxide to flow in the sand mixing tank, gradually increasing the discharge capacity to the fracturing design discharge capacity, and pushing the turbine to rotate.
Specifically, the initial liquid carbon dioxide injection is gasified under the low-pressure high-temperature environment, the temperature and the lifting pressure in the sand mixing tank are gradually reduced, and the liquid carbon dioxide is continuously and slowly injected until the temperature and the pressure reach critical values, so that stable liquid carbon dioxide is generated; it should be noted that the injection cannot be fast in the process, and the temperature suddenly drops, so as to avoid damaging the glass fiber reinforced plastic cylinder body.
Further, liquid carbon dioxide is fed into the cylinder through the liquid inlet, and the turbine is driven to rotate by hydrodynamic force generated by the flow of the liquid carbon dioxide on the surface of the impeller, so that the liquid flows in a vortex shape and in a turbulent flow shape under the influence of the rotation of the turbine.
Alternatively, step 3) includes:
3.1 Conveying the propping agent into the sand mixing tank through the sand inlet, so that the propping agent passes through a turbine close to the sand inlet under the carrying of the liquid carbon dioxide, and the propping agent and the liquid carbon dioxide are stirred and mixed for the first time;
3.2 The sand-carrying fluid flows to the discharge port and passes through the turbine close to the discharge port to be mixed and stirred secondarily.
Specifically, when the propping agent passes through the turbine close to the sand inlet under the carrying of the liquid carbon dioxide, the rotation of the turbine drives the propping agent and the liquid carbon dioxide to be stirred and mixed for the first time; the liquid flows in a turbulent state after passing through the turbine, so that sand carrying capacity is improved, meanwhile, vortex is formed under the action of the turbine, the mixing degree of the liquid and the propping agent is further improved, and the propping agent cannot deposit sand in a pipe in the migration process under the double influences of the vortex and the turbulent flow; and the sand-carrying liquid is transported to the liquid outlet, and is contacted with a turbine close to the liquid outlet for 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 is additionally provided with an impeller, the additional stirring function for the sand-carrying fluid can be added, and the sand carrying performance of the liquid carbon dioxide is further improved, but the mixing condition of the sand-carrying fluid is difficult to observe at the moment, so that the turbine shaft cannot be provided with the additional impeller when the mixing condition of the sand-carrying fluid is to be observed.
Examples
FIG. 1 shows a schematic diagram of a visual carbon dioxide fracturing sand mixing device of the present embodiment; figure 2 shows a section A-A of figure 1.
As shown in fig. 1 and 2, the sand mixing tank comprises a transparent cylinder body 10 and a pair of connectors 3, wherein the transparent cylinder body 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 body 10 is covered with a hydrophobic coating; the pair of connectors 3 are made of steel, 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 screw threads, a liquid inlet 2 and a sand inlet 1 are arranged on one connector 3, a discharge outlet 7 is arranged on the other connector 3, and the axes of the liquid inlet 2, the sand inlet 1 and the discharge outlet 7 are parallel to the axis of the transparent cylinder 10;
the turbine 5 comprises a shaft sleeve, an outer ring and a plurality of blades 8, the outer ring is sleeved on the outer side of the shaft sleeve and is coaxial with the shaft sleeve, the blades are connected between the shaft sleeve and the outer ring along the radial direction of the outer ring 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 a 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 positioned on the axis of the transparent cylinder 10.
The sand mixing device further comprises a thermometer, a pressure gauge and a flowmeter, and the thermometer, the pressure gauge and the flowmeter are arranged in the sand mixing tank and are used for measuring the temperature and the pressure in the tank and monitoring the flow.
The device has the advantages that the transparent cylinder body and the turbine are arranged, vortex flow is manufactured in the pipeline through hydrodynamic property, so that the mixing degree of sand-carrying fluid is improved, a traditional stirring rod is not needed, external equipment is not needed, energy input is not needed, equipment is simplified, the reliability is improved, and the imagination of sand deposition in the pipeline is avoided; meanwhile, the system has visibility, is convenient for observing the state of sand-carrying fluid, and is more real and objective in feedback to construction.
The carbon dioxide fracturing sand mixing method comprises the following steps:
1) A fixing device is arranged on the ground;
2) The transparent cylinder body is arranged on the fixing device, the axis of the transparent cylinder body is kept horizontal, and the transparent cylinder body is ensured not to bear external stress after being arranged;
3) Installing a joint and a turbine shaft, so that the turbine shaft is in transmission connection between turbines at two ends of the transparent cylinder;
4) The liquid inlet, the sand inlet and the discharge outlet are connected with corresponding pipelines, and the axes of the liquid inlet, the sand inlet and the discharge outlet 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 generating stable liquid carbon dioxide, wherein the liquid carbon dioxide cannot be rapidly injected in the process, so that the temperature suddenly drops to avoid damaging the glass fiber reinforced plastic cylinder body;
6) Opening a liquid outlet to enable liquid carbon dioxide to flow in the sand mixing tank, gradually increasing the discharge capacity to the fracturing design discharge capacity, and pushing the turbine to rotate; at the moment, hydrodynamic force generated by the flow of the liquid carbon dioxide on the surface of the impeller drives the turbine to rotate, and the liquid flows in a vortex mode and in a turbulent flow mode under the influence of the rotation of the turbine;
7) The proppant is conveyed into the sand mixing tank through 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 promoted to be stirred and mixed for the first time, the liquid flows in a turbulent state after passing through the turbine, sand carrying capacity is improved, meanwhile, vortex is formed under the action of the turbine, the mixing degree with the proppant is further improved, and the proppant cannot be subjected to the phenomenon of sand setting in a pipe in the migration process under the double influences of the vortex and the turbulent flow;
8) The sand-carrying fluid flows to the discharge port, passes through the turbine close to the discharge port, and is subjected to secondary mixing and stirring, so that the sand blocking phenomenon caused by proppant sedimentation is effectively avoided.
9) And the sand-carrying fluid is discharged from a discharge port, and the discharge port is connected with a manifold and finally pumped into a wellhead through a pump truck pressurizing pump.
According to the invention, the transparent cylinder is arranged, so that the state of sand-carrying fluid can be conveniently observed, the feedback of construction conditions is more real and objective, and the turbines are arranged at the two ends of the cylinder, so that the hydraulic starting is realized without a traditional stirring rod, without introducing external equipment or energy input, thereby simplifying equipment and improving reliability; 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.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described.
Claims (8)
1. Visual carbon dioxide fracturing sand mixing device, characterized by, include:
the sand mixing tank comprises a transparent cylinder body and a pair of connectors, wherein the connectors are used for respectively sealing two ends of the transparent cylinder body, one connector is provided with a liquid inlet and a sand inlet, and the other connector is provided with a discharge hole;
the turbine shafts are in transmission connection through turbine shafts and are positioned on the axis of the transparent cylinder;
the axes of the liquid inlet, the sand inlet and the discharge outlet are parallel to the axis of the transparent cylinder;
the turbine comprises a shaft sleeve, an outer ring and a plurality of blades, wherein the outer ring is sleeved on the outer side of the shaft sleeve and is coaxial with the shaft sleeve, the 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.
2. The visual carbon dioxide fracturing sand mixing device of 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 of claim 1, wherein the transparent cylinder is connected with the joint through threads, and sealing rings are arranged in threads of the threads.
4. The visual carbon dioxide fracturing sand mixing device of claim 1, 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.
5. A carbon dioxide fracturing sand mixing method utilizing the visualized carbon dioxide fracturing sand mixing device according to any one of claims 1-4, characterized in that 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 through the liquid inlet to enable the liquid carbon dioxide to flow in the sand mixing tank so as to push the turbine to rotate;
3) Conveying propping agent into the sand mixing tank through the sand inlet, so that the propping agent is contacted and mixed with the liquid carbon dioxide under the action of the turbine;
4) And the sand-carrying liquid is discharged from the discharge port.
6. The carbon dioxide fracturing sand mixing method of claim 5, wherein step 1) comprises:
1.1 A fixing device is arranged on the ground;
1.2 Mounting the transparent cylinder on the fixing device, and keeping the axis of the transparent cylinder horizontal;
1.3 Mounting a joint and a turbine shaft;
1.4 Connecting the liquid inlet, the sand inlet and the discharge outlet with corresponding pipelines, and ensuring that the axes of the liquid inlet, the sand inlet and the discharge outlet are coincident with the axes of the pipelines during connection.
7. The carbon dioxide fracturing sand mixing method of claim 6, wherein 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 to enable liquid carbon dioxide to flow in the sand mixing tank, gradually increasing the discharge capacity to the fracturing design discharge capacity, and pushing the turbine to rotate.
8. The carbon dioxide fracturing sand mixing method of claim 6, wherein step 3) comprises:
3.1 Conveying the propping agent into the sand mixing tank through the sand inlet, so that the propping agent passes through a turbine close to the sand inlet under the carrying of the liquid carbon dioxide, and the propping agent and the liquid carbon dioxide are stirred and mixed for the first time;
3.2 The sand-carrying fluid flows to the discharge port and passes through the turbine close to the discharge port to be mixed and stirred secondarily.
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