CN113856540A - Preparation device and method of co-flow type epoxy resin phase-change propping agent with controllable particle size - Google Patents
Preparation device and method of co-flow type epoxy resin phase-change propping agent with controllable particle size Download PDFInfo
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- CN113856540A CN113856540A CN202111302857.5A CN202111302857A CN113856540A CN 113856540 A CN113856540 A CN 113856540A CN 202111302857 A CN202111302857 A CN 202111302857A CN 113856540 A CN113856540 A CN 113856540A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
Abstract
The embodiment of the invention relates to a preparation device and a preparation method of a co-flow type epoxy resin phase-change propping agent with controllable particle size, the co-flow type preparation device of the epoxy resin phase-change propping agent with controllable particle size comprises a pressure controller, a co-flow type micro-channel tubular emulsion preparation device and a fracturing fluid holding tank, wherein the co-flow type micro-channel tubular emulsion preparation device is connected with the pressure controller, and the constant pressure pump is controlled by the pressure controller to respectively inject the mixed system of emulsifier aqueous solution, epoxy resin and curing agent into the co-flow type micro-channel tubular emulsion preparation device, the fracturing fluid holding tank is provided with an interface connected with the co-flow type micro-channel tubular emulsion preparation device and holds fracturing fluid, the device is used for stirring the emulsion particles generated by the co-flow micro-channel tubular emulsion preparation device through a co-flow micro-channel method and the fracturing fluid.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil and gas field development, in particular to a preparation device and method of a co-flow type epoxy resin phase-change propping agent with controllable particle size.
Background
The hydraulic fracturing technology is widely applied to all large oil fields as a main technical means for reservoir transformation and recovery efficiency improvement. In the hydraulic fracturing technology, the injection of solid proppants to prevent the re-closure of the created fractures is the key to ensure that the fractures have high conductivity. At present, solid proppants such as quartz sand, ceramsite and the like commonly used in oil fields need high-viscosity sand carrying liquid to effectively carry the solid proppants due to high density of the solid proppants, and a plurality of limitations exist in the using process: firstly, the viscosity of high-viscosity sand-carrying liquid is increased by adding a thickening agent to obtain good sand-carrying performance, and the thickening agent is usually remained in a reservoir and causes damage to the reservoir, so that the flow conductivity of cracks is reduced; secondly, the high viscosity sand carrying liquid can cause the liquid to have larger flow resistance in pipelines, mineshafts and cracks, and increase the difficulty of pumping the propping agent; thirdly, the solid propping agent has poor migration capability due to high density, and is difficult to enter into secondary and tertiary branch cracks with small width to form effective support; fourthly, the solid propping agent is easy to accumulate due to the rigid structure, so that the branch seams are blocked, and the recovery ratio is reduced; the injection of the solid propping agent can cause certain abrasion to pipelines and mineshafts, the sand adding fracturing process is complex, the requirements of high discharge capacity and high pump pressure accompanied by high sand filling on well heads, construction equipment and construction pipe columns are high, and sand blocking can be caused by improper control in the sand adding process. In order to overcome the above performance defects of conventional proppants, liquid proppants are increasingly developed at the present stage, wherein a thermosetting epoxy resin proppant is more than one of the proppants, the proppant is obtained by taking a mixed system of resin and a curing agent as an oil phase and obtaining a stable oil-in-water emulsion through an emulsification process, and is cured at a specific reservoir temperature to obtain proppant particles, but the emulsion process of the in-situ resin proppant is usually obtained through stirring, and has poor stability and particle size uniformity.
Disclosure of Invention
The embodiment of the invention aims to provide a preparation device and a preparation method of a co-flow type epoxy resin phase-change propping agent with controllable particle size, and aims to solve the problems of poor emulsion stability and particle size uniformity and the like in the field preparation of the resin phase-change propping agent at the present stage.
In order to solve the above technical problems, an embodiment of the present invention provides a device for preparing a co-flow type epoxy resin phase-change proppant with controllable particle size, including:
a pressure control machine;
the co-flow type micro-channel tubular emulsion preparation device is connected with the pressure controller, and a constant pressure pump is controlled by the pressure controller to respectively inject a mixed system of an emulsifier aqueous solution, epoxy resin and a curing agent into the co-flow type micro-channel tubular emulsion preparation device;
and the fracturing fluid containing tank is provided with an interface connected with the co-flow type micro-channel tubular emulsion preparation device, and contains fracturing fluid which is used for stirring emulsion particles generated by the co-flow type micro-channel tubular emulsion preparation device through a co-flow type micro-channel method and the fracturing fluid.
Preferably, the co-flow microchannel tubular emulsion preparation apparatus comprises:
the surfactant solution storage device is provided with a cavity and a main pipeline formed by extending outwards, the main pipeline is communicated with the cavity, and the pressure controller controls the first constant pressure pump to inject the emulsifier aqueous solution into the cavity at a first flow rate;
the epoxy resin and curing agent system reservoir device is arranged in the cavity, and the pressure controller controls the second constant pressure pump to inject the mixed system of the epoxy resin and the curing agent into the epoxy resin and curing agent system reservoir device at a second flow rate; and the number of the first and second groups,
and one end of the resin transportation micro-pipeline is communicated with the reservoir device of the epoxy resin and curing agent system, the other end of the resin transportation micro-pipeline is accommodated in the main pipeline and is connected with the interface, and the resin transportation micro-pipeline and the main pipeline are coaxially arranged.
Preferably, the number of the resin transportation micro-pipes is multiple, the axes of the resin transportation micro-pipes are parallel to the axis of the main pipe, and the other ends of the resin transportation micro-pipes are uniformly distributed in the main pipe.
Preferably, two ends of the resin transportation micro-pipeline are detachably connected with the interface, the epoxy resin and the curing agent system reservoir device respectively.
Preferably, the resin transport microchannels are matched to the particle size of the desired resin phase change proppant.
In order to achieve the above object, the present invention further provides a method for preparing an epoxy resin phase change proppant by using the above epoxy resin phase change proppant preparation apparatus, comprising the steps of:
selecting a co-flow micro-channel tubular emulsion preparation device matched with the particle size of the epoxy resin phase-change propping agent;
and controlling the flow rate ratio of the emulsifier aqueous solution, the epoxy resin and the curing agent injected into the co-flow type microchannel tubular emulsion preparation device by a pressure controller to obtain the epoxy resin phase change proppant particles.
Preferably, the step of selecting the co-flow micro-channel tubular emulsion preparation device matched with the particle size of the epoxy resin phase-change proppant comprises the following steps:
selecting a resin transportation micro-pipeline matched with the particle size of the epoxy resin phase-change propping agent, and respectively installing two ends of the resin transportation micro-pipeline to the epoxy resin and curing agent system reservoir device and the interface.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a co-flow type preparation device for an epoxy resin phase-change proppant with a controllable particle size, provided by the invention:
FIG. 2 is a partial schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic diagram of a co-flow microchannel method employed in the present invention.
| Reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
23 | Resin transportation micro-pipeline |
| 2 | Co-flow type micro-channel tubular |
3 | Fracturing |
| 21 | Surfactant |
31 | |
| 211 | Containing |
41 | First |
| 212 | |
42 | Second |
| 22 | Epoxy resin and curing agent system reservoir device |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides a co-flow type apparatus for preparing epoxy resin phase-change proppant with controllable particle size, referring to fig. 1 to 3, the co-flow type preparation device of the epoxy resin phase-change propping agent with controllable particle size comprises a pressure controller 1, a co-flow type micro-channel tubular emulsion preparation device 2 and a fracturing fluid holding tank, wherein the co-flow type micro-channel tubular emulsion preparation device 2 is connected with the pressure controller 1, and the constant pressure pump is controlled by the pressure controller 1 to respectively inject the mixed system of emulsifier aqueous solution, epoxy resin and curing agent into the co-flow type micro-channel tubular emulsion preparation device 2, the fracturing fluid holding tank is provided with an interface 31 connected with the co-flow type micro-channel tubular emulsion preparation device 2 and holds fracturing fluid, used for stirring the emulsion particles generated by the co-flow micro-channel tubular emulsion preparation device 2 through the co-flow micro-channel method and the fracturing fluid.
It should be noted that, in the process of forming the single emulsion, usually, a dispersed phase is injected into a microchannel through a pressure driving device, then a dispersion medium is injected into the microchannel through another independent driving device, after the two-phase fluid is converged, a phase interface is deformed and broken under the combined action of an inertia force, a viscous force and an interfacial tension by controlling pressure and flow, and finally the single emulsion is formed. The co-flow microchannel method comprises the following steps: in the co-flow type micro-channel, the dispersion medium wraps the dispersion phase to flow coaxially, and the dispersion phase is cut into droplets at an outlet, so that the emulsion is obtained. The invention adopts the co-flow micro-channel method, can obtain a large amount of emulsion droplets by adding the number of channels for inputting dispersion media, and simultaneously realizes controllable and uniform particle size of the obtained emulsion droplets by changing the size of the channels, thereby meeting the requirements of actual field production and application.
According to the invention, the constant pressure pump is controlled by the pressure controller 1 to respectively inject the mixed system of the emulsifier aqueous solution, the epoxy resin and the curing agent into the co-flow type micro-channel tubular emulsion preparation device 2, and the fracturing fluid holding tank is connected with the co-flow type micro-channel tubular emulsion preparation device 2, so that the mixed system of the fracturing fluid and the emulsion particles is continuously stirred to keep the stability of the emulsion.
Specifically, the co-flow type microchannel tubular emulsion preparation device 2 comprises a surfactant solution storage device 21, an epoxy resin and curing agent system reservoir device 22, and a resin transportation micro-pipeline 23, wherein the surfactant solution storage device 21 is provided with a cavity 211 and a main pipeline 212 formed by extending outwards, the main pipeline 212 is communicated with the cavity 211, a first constant pressure pump 41 is controlled by the pressure controller 1 to inject an emulsifier aqueous solution into the cavity 211 at a first flow rate, the epoxy resin and curing agent system reservoir device 22 is arranged in the cavity 211, a second constant pressure pump 42 is controlled by the pressure controller 1 to inject a mixed system of epoxy resin and curing agent into the epoxy resin and curing agent system reservoir device 22 at a second flow rate, one end of the resin transportation micro-pipeline 23 is communicated with the epoxy resin and curing agent reservoir device 22, the other end is accommodated in the main pipe 212 and connected with the interface 31, and the resin transportation micro-pipe 23 is coaxially arranged with the main pipe 212. The interface 31 between the epoxy resin and curing agent system reservoir device 22 and the fracturing fluid holding tank is the key point for forming stable emulsion with uniform particle size, the resin transportation micro-pipeline 23 and the main pipeline 212 are coaxially arranged, the emulsifier aqueous solution flows in through the pores between the resin transportation micro-pipeline and the main pipeline 212, and the channels for transporting the surfactant aqueous solution and the epoxy resin and curing agent mixed system are coaxial, so that the size of the liquid drops of the obtained liquid proppant has better uniformity.
In this embodiment, there are two first constant pressure pumps 41, where the two first constant pressure pumps 41 are respectively connected to the cavity 211, and are configured to inject an emulsifier aqueous solution into the cavity 211 and flow out through a main pipe 212 of the cavity 211, and the second constant pressure pump 42 is connected to the epoxy resin and curing agent system reservoir device 22, and is configured to inject a mixed system of epoxy resin and curing agent into the epoxy resin and curing agent system reservoir device 22, and the mixed system of epoxy resin and curing agent flows out through the resin transportation micro-pipe.
In this embodiment, the number of the resin transporting micro-pipes 23 is plural, the axes of the plural resin transporting micro-pipes 23 are parallel to the axis of the main pipe 212, and the other ends of the plural resin transporting micro-pipes 23 are uniformly distributed in the main pipe 212. According to the invention, the resin transportation micro-pipeline 23 and the main pipeline 212 are coaxially arranged, the emulsifier aqueous solution flows in through the pores between the resin transportation micro-pipelines and the main pipeline 212, and the channels for transporting the surfactant aqueous solution and the mixed system of the epoxy resin and the curing agent are coaxial, so that the droplet size of the obtained liquid proppant has better uniformity.
The two ends of the resin transportation micro-pipe 23 are detachably connected with the interface 31, the epoxy resin and curing agent system reservoir device 22 respectively, so that the resin transportation micro-pipe 23 with different sizes can be selected according to the particle size of the needed resin proppant, and the particle size of the obtained proppant can be controlled according to the characteristics of the reservoir. Specifically, the resin transport microchannels 23 are matched to the particle size of the desired epoxy phase change proppant.
In order to achieve the above object, the present invention further provides a method for preparing an epoxy resin phase change proppant by using the above epoxy resin phase change proppant preparation apparatus, comprising the steps of:
step S210, selecting a co-flow micro-channel tubular emulsion preparation device 2 matched with the particle size of the epoxy resin phase change propping agent;
specifically, the step S210 includes: selecting a resin transportation micro-pipeline 23 matched with the particle size of the epoxy resin phase-change propping agent, and respectively installing two ends of the resin transportation micro-pipeline 23 to the epoxy resin and curing agent system reservoir device 22 and the interface 31.
And S220, controlling the flow rate ratio of the emulsifier aqueous solution, the epoxy resin and the curing agent injected into the co-flow type micro-channel tubular emulsion preparation device 2 by the pressure controller 1 to obtain the epoxy resin phase change proppant particles.
Example 1
The particle size and uniformity of the resulting cured proppant particles were analyzed by using 2% of nanosilica as an emulsifier aqueous solution and an adduct of diethylenetriamine and butyl glycidyl ether as a mixed system of an epoxy resin and a curing agent, and selecting resin transportation micro-pipes 23 having diameters of 2.9mm, 1.7mm, 0.95mm, 0.6mm, 0.4mm and 0.18mm, respectively, while controlling the flow rate ratios of the surfactant aqueous solution and the epoxy resin and curing agent systems.
According to experimental results, the obtained proppant particles are respectively 2.9mm (7 meshes), 1.7mm (12 meshes), 0.95mm (20 meshes), 0.6mm (30 meshes), 0.4mm (40 meshes) and 0.18mm (80 meshes), the requirement of the number of the proppant particles for simultaneously supporting a near-wellbore zone, a main crack and a branch crack can be met, and the obtained proppant particles with different particle sizes have good uniformity.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A preparation device of co-flow type epoxy resin phase-change proppant with controllable particle size is characterized by comprising:
a pressure control machine;
the co-flow type micro-channel tubular emulsion preparation device is connected with the pressure controller, and a constant pressure pump is controlled by the pressure controller to respectively inject a mixed system of an emulsifier aqueous solution, epoxy resin and a curing agent into the co-flow type micro-channel tubular emulsion preparation device;
and the fracturing fluid containing tank is provided with an interface connected with the co-flow type micro-channel tubular emulsion preparation device, and contains fracturing fluid which is used for stirring emulsion particles generated by the co-flow type micro-channel tubular emulsion preparation device through a co-flow type micro-channel method and the fracturing fluid.
2. The apparatus for preparing a co-flow type controlled particle size epoxy resin phase change proppant of claim 1, wherein the apparatus for preparing a co-flow type microchannel tubular emulsion comprises:
the surfactant solution storage device is provided with a cavity and a main pipeline formed by extending outwards, the main pipeline is communicated with the cavity, and the pressure controller controls the first constant pressure pump to inject the emulsifier aqueous solution into the cavity at a first flow rate;
the epoxy resin and curing agent system reservoir device is arranged in the cavity, and the pressure controller controls the second constant pressure pump to inject the mixed system of the epoxy resin and the curing agent into the epoxy resin and curing agent system reservoir device at a second flow rate; and the number of the first and second groups,
and one end of the resin transportation micro-pipeline is communicated with the reservoir device of the epoxy resin and curing agent system, the other end of the resin transportation micro-pipeline is accommodated in the main pipeline and is connected with the interface, and the resin transportation micro-pipeline and the main pipeline are coaxially arranged.
3. The apparatus for preparing co-flow type epoxy resin phase-change proppant with controllable particle size according to claim 2, wherein the number of the resin transportation micro-pipes is multiple, the axes of the multiple resin transportation micro-pipes are arranged in parallel with the axis of the main pipe, and the other ends of the multiple resin transportation micro-pipes are uniformly distributed in the main pipe.
4. The apparatus for preparing co-flow type epoxy resin phase-change proppant with controllable particle size according to claim 2, wherein two ends of the resin transportation micro-pipeline are detachably connected with the interface, the epoxy resin and curing agent system reservoir apparatus respectively.
5. The apparatus of claim 2, wherein the resin transport micro-pipe is matched to the desired epoxy phase change proppant particle size.
6. A method for preparing an epoxy resin phase change proppant by using the epoxy resin phase change proppant preparation device as set forth in any one of claims 1 to 5, comprising the steps of:
selecting a co-flow micro-channel tubular emulsion preparation device matched with the particle size of the epoxy resin phase-change propping agent;
and controlling the flow rate ratio of the emulsifier aqueous solution, the epoxy resin and the curing agent injected into the co-flow type microchannel tubular emulsion preparation device by a pressure controller to obtain the epoxy resin phase change proppant particles.
7. The method of claim 6, wherein the step of selecting a co-flow microchannel tubular emulsion production device that matches the particle size of the epoxy phase change proppant comprises:
selecting a resin transportation micro-pipeline matched with the particle size of the epoxy resin phase-change propping agent, and respectively installing two ends of the resin transportation micro-pipeline to the epoxy resin and curing agent system reservoir device and the interface.
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