CN112145163A - Experimental device and experimental method for simulating staged fracturing horizontal well foam discharging process - Google Patents
Experimental device and experimental method for simulating staged fracturing horizontal well foam discharging process Download PDFInfo
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- CN112145163A CN112145163A CN201910563744.7A CN201910563744A CN112145163A CN 112145163 A CN112145163 A CN 112145163A CN 201910563744 A CN201910563744 A CN 201910563744A CN 112145163 A CN112145163 A CN 112145163A
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- 238000000034 method Methods 0.000 title claims abstract description 85
- 239000006260 foam Substances 0.000 title claims abstract description 77
- 238000002474 experimental method Methods 0.000 title claims abstract description 23
- 238000007599 discharging Methods 0.000 title claims description 34
- 239000007788 liquid Substances 0.000 claims abstract description 106
- 238000004088 simulation Methods 0.000 claims abstract description 62
- 239000004088 foaming agent Substances 0.000 claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims description 70
- 238000009825 accumulation Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 238000011068 loading method Methods 0.000 abstract description 7
- 238000005457 optimization Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005429 filling process Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 241000521257 Hydrops Species 0.000 description 2
- 206010030113 Oedema Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention relates to a gas well gas production process simulation experiment device, in particular to an experiment device and an experiment method for simulating a staged fracturing horizontal well foam drainage process, wherein the experiment device comprises a simulation shaft for simulating the shape of the staged fracturing horizontal well, a power device for simulating formation gas production and/or liquid production, and a dosing device for injecting a foaming agent, wherein the dosing device and the power device are respectively communicated with the simulation shaft to vividly simulate the staged fracturing horizontal well structure, so that the foam forming process after injecting the foaming agent into the staged fracturing horizontal well and the simulation of the flow form of a foam liquid in the horizontal, inclined and vertical shafts are realized, the liquid carrying capacity of the foaming agent under different oil contents is conveniently and accurately evaluated according to the experiment result, the optimal injection concentration of the foaming agent under different liquid loading degrees and different oil contents is obtained, and a powerful support is provided for the optimization of the staged fracturing horizontal well foam drainage process parameters, the experimental method is simple, wide in application range and high in accuracy.
Description
Technical Field
The invention relates to a simulation experiment device for a gas production process of a gas well, in particular to an experiment device and an experiment method for simulating a staged fracturing horizontal well foam discharging process.
Background
In the production process of a gas recovery well, a certain amount of formation water and oil can be produced along with the production of natural gas and are output from a wellhead of the gas recovery well along with the natural gas, when the yield of the gas recovery well is reduced, the air flow speed is not enough to carry liquid to the ground, so that the liquid is accumulated at the bottom of the well, the gas yield is reduced, and the gas well cannot produce in severe cases.
The existing horizontal well for exploiting a compact sandstone gas reservoir by staged fracturing in China has the defects that the inclination angle of the horizontal well is gradually changed from 0 degree to 90 degrees, when a foam drainage process is carried out, gas firstly flows into an annular space between a sleeve and an oil pipe which are separated by a plurality of packers from a stratum, then flows into the oil pipe through a sand blasting hole in the oil pipe, a foaming agent is disturbed to form foam, and finally accumulated liquid in a shaft is carried to the ground, because the existing staged fracturing horizontal well has a complex shape, an experimental device capable of simulating the horizontal well with the structure does not exist at present, and the stirring method and the Ross-Miles method which are used for measuring and evaluating the performance of the foaming agent at home and abroad have the following limitations: the method comprises the following steps that firstly, the flowing, mixing and disturbing processes of a foaming agent and a stratum produced fluid in a well bore cannot be simulated; secondly, the flowing rule of the foam liquid in the horizontal section, the inclined shaft section and the straight shaft section of the horizontal well cannot be reflected; and thirdly, the liquid carrying capacity of the foaming agent under different oil contents cannot be measured, so that the foaming and liquid carrying processes of the fluid in a shaft cannot be simulated really, the optimization of technical parameters of the foam drainage of the staged fractured horizontal well cannot be realized, and the smooth operation of the foam drainage process is influenced.
In summary, a technical scheme is urgently needed at present, and the technical problems that an experimental device capable of simulating staged fracturing of a horizontal well does not exist at present, and the existing experimental device is limited, so that bubbling and liquid carrying processes of a fluid in a shaft are difficult to truly simulate, and optimization of foam drainage technical parameters of the staged fracturing horizontal well is difficult to achieve are solved.
Disclosure of Invention
The invention aims to: aiming at the technical problems that no experimental device capable of simulating the staged fracturing horizontal well exists at present, the foaming and liquid carrying processes of a fluid in a shaft are difficult to truly simulate and the foam drainage technical parameters of the staged fracturing horizontal well are difficult to optimize due to the limitation of the existing experimental device, the experimental device and the experimental method for simulating the staged fracturing horizontal well foam drainage process are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
the experimental device comprises a simulation shaft for simulating the shape of the staged fracturing horizontal well, a power device for simulating gas production and/or liquid production of a stratum, and a dosing device for injecting a foaming agent, wherein the dosing device and the power device are respectively communicated with the simulation shaft to simulate the structure of the staged fracturing horizontal well during foam drainage.
The experimental device for simulating the staged fracturing horizontal well foam discharging process has the advantages that the structure of the staged fracturing horizontal well is simulated by adopting the simulated shaft, the stratum is simulated by the power device, the foaming agent is injected into the simulated shaft by the dosing device under the condition of realistically simulating the horizontal well structure, the foam forming process after the foaming agent is injected into the staged fracturing horizontal well and the flowing form of foam liquid in the horizontal, inclined and vertical shafts are simulated, so that the experimental analysis on the factors influencing the foam discharging effect of the horizontal well is facilitated, wherein the amount of liquid and the amount of gas added into the simulated shaft can be adjusted according to the actual condition, so that the experimental device with the structure can simulate the horizontal wells with different liquid accumulation degrees and different gas production rates, the accurate analysis on the foam discharging process of gas wells in different working states is realized, or the inclination angle of the shaft axis of the simulated shaft is adjusted, the experimental device with the structure can simulate different well sections of a gas well, and can accurately analyze the flowing rule of foam liquid in different well sections, or experimental oil is added into a simulated shaft through a power device to simulate stratum oil production, so that the experimental device with the structure can accurately measure the liquid carrying capacity of the foaming agent under different oil contents, the optimal concentration of the foaming agent under shaft liquid loading of different degrees, the liquid loading rule of a liquid production gas well and the optimal concentration of the foaming agent under different oil contents of the oil-containing gas well can be conveniently obtained according to the experimental result, powerful support is provided for the existing sectional fracturing horizontal well foam drainage technological parameter optimization under different working states, the application range is wide, and the experimental accuracy is high.
Preferably, the simulation well bore comprises a simulation oil pipe and a simulation casing pipe, the simulation oil pipe and the simulation casing pipe are coaxially arranged, and an annular space structure between the oil pipe and the casing pipe of the horizontal well is simulated. The simulation oil pipe and the simulation casing are coaxially arranged, so that the actual structure of the horizontal well is truly simulated, the experimental result is more accurate, and the actual working condition of the gas well can be truly reflected.
Preferably, the simulation oil pipe comprises an upper section oil pipe, a middle section oil pipe and a lower section oil pipe which are sequentially communicated, the simulation sleeve comprises an upper section sleeve, a middle section sleeve and a lower section sleeve which are sequentially communicated, the upper section oil pipe and the upper section sleeve are coaxially arranged to simulate a straight well section of the horizontal well, the middle section oil pipe and the middle section sleeve are coaxially arranged to simulate an inclined well section of the horizontal well, and the lower section oil pipe and the lower section sleeve are coaxially arranged to simulate a horizontal well section of the horizontal well. The simulation shaft with the three-section structure is adopted to respectively simulate the straight well section, the inclined well section and the horizontal well section of the horizontal well, so that the structure of the simulation shaft is the same as the actual structure of the horizontal well, and the experimental result is more real and accurate.
Preferably, the fracturing simulation device further comprises a plurality of packers, wherein the packers divide an annular space between the lower section oil pipe and the lower section casing pipe into a plurality of chambers, the chambers are communicated with the power device and communicated with the simulation oil pipe through holes formed in the lower section oil pipe, and the staged fracturing structure of the horizontal well is simulated. The packer is adopted to seal the annular space between the lower section oil pipe and the lower section casing in a segmented manner, so that the experimental device of the structure can simulate the staged fracturing structure of the horizontal well more vividly, and the experimental result is closer to the actual production condition of the staged fracturing horizontal well.
Preferably, a flow distribution mechanism is arranged between the power device and the lower section sleeve, a liquid inlet and a plurality of liquid outlets are arranged on the flow distribution mechanism, the liquid inlet is communicated with the power device, and the liquid outlets are communicated with the cavities in a one-to-one correspondence manner. The power device is used for simultaneously conveying the gas and the liquid to the plurality of chambers, unbalance of gas and liquid input of each chamber due to influence of arrangement of the conveying channels is avoided, gas production and liquid production of the stratum are further simulated truly, and authenticity of experimental results is guaranteed.
Preferably, the power plant includes an air input for simulating gas production from the formation and a liquid input for simulating liquid production from the formation. The air input device and the liquid input device are adopted to respectively convey gas or liquid into the cavity, the flowing processes of the gas and the liquid in different well sections are truly reflected, the processes of generating foam and carrying liquid flowing of the foaming agent in different liquid loading amounts, different gas production amounts and different well section gas wells are truly simulated, and powerful support is provided for researching the liquid loading rule of a liquid production gas well and the optimal foaming agent concentration of an oil-gas-containing well under different oil contents.
Preferably, the simulation well bore further comprises a liquid collecting device which is communicated with the top end and the bottom end of the simulation well bore simultaneously and collects waste liquid and waste gas output from the simulation well bore. The liquid collecting device is arranged, so that liquid and gas in the experimental process can be collected in the liquid collecting device, and the environment pollution is avoided.
Preferably, a first control valve is arranged between the air input device and the simulation shaft, a second control valve is arranged between the liquid input device and the simulation shaft, a third control valve is arranged between the dosing device and the simulation shaft, a fourth control valve is arranged between the liquid collecting device and the simulation shaft, and a drain valve is arranged between the lower casing and the liquid collecting device. Through the arrangement of the valves, the communication and the cut-off of the pipelines where the valves are located are conveniently controlled respectively by controlling the opening or closing of the valves, so that the working states of the gas well in different periods are conveniently simulated, and the experimental result can reflect the actual foam drainage technological process of the gas well more truly.
Preferably, the simulation device further comprises a supporting device, wherein the supporting device comprises at least one angle adjusting mechanism, the angle adjusting mechanism is matched with the simulation well bore, and the inclination angle of the well bore axis of the simulation well bore is adjusted. The inclination angle of the shaft axis of each well section can be conveniently adjusted, the actual structures of different gas wells can be truly simulated, the experimental result is more accurate, and meanwhile, the experimental device is convenient to adjust and wide in application range.
Preferably, the supporting device comprises a base and a plurality of slips rotatably arranged on the base, and the slips are connected with the simulated well bore in a clamping manner. Adopt slips and base normal running fit's mode to constitute strutting arrangement, simple structure makes things convenient for the setting of each well section and the inclination adjustment of pit shaft axis, makes things convenient for this experimental apparatus's use.
An experimental method for simulating a staged fracturing horizontal well foam discharging process adopts the experimental device for simulating the staged fracturing horizontal well foam discharging process, and comprises the following steps: the method comprises the following steps: setting a simulated shaft: assembling a simulated shaft, adjusting the inclination angle of the axis of the simulated shaft, and simulating the actual structure of the staged fracturing horizontal well; step two: setting the liquid accumulation state of the gas well: inputting water and oil with experiment demand into a simulated shaft through a power device, and simulating the liquid accumulation state of the staged fracturing horizontal well; step three: setting a gas well dosing state: adding a foaming agent into the simulated shaft through a dosing device, and simulating a technological process of injecting the foaming agent into the staged fracturing horizontal well; step four: setting the working state of gas well effusion: inputting air into the simulated shaft through a power device, and simulating a gas production process and a foam drainage process of the stratum; step five: a cleaning device: clean water is input into the simulated shaft through a power device, and the simulated shaft is cleaned.
According to the experimental method for simulating the staged fracturing horizontal well foam discharging process, the experimental device for simulating the staged fracturing horizontal well foam discharging process is adopted, on the basis of truly simulating the actual structure of the staged fracturing horizontal well, the liquid accumulation state, the foaming agent filling process, the foam forming process and the liquid carrying process of the staged fracturing horizontal well are truly simulated respectively, so that the obtained experimental result can more accurately reflect the process of generating the foam and carrying the liquid flow of the foaming agent in the staged fracturing horizontal well, the experimental method is simple, the experimental result is accurate, and powerful support is provided for researching the liquid accumulation rule of a liquid-producing gas well and the optimal foaming agent concentration of an oil-containing gas well under different oil rates.
In conclusion, the experimental device for simulating the staged fracturing horizontal well foam discharging process has the beneficial effects that:
1. by adopting the simulated shaft to simulate the structure of the staged fracturing horizontal well and simulating the stratum through the power device, the simulation of the foam drainage process of the staged fracturing horizontal well is realized under the condition of vividly simulating the structure of the gas well, so that the factors influencing the foam drainage effect of the gas well can be conveniently subjected to experimental analysis, the optimal concentration of the foaming agent under shaft effusion, the effusion rule of a liquid-producing gas well and the optimal foaming agent concentration of an oil-containing gas well under different oil contents in different degrees are obtained, powerful support is provided for the optimization of the foam drainage process parameters of the staged fracturing horizontal well in different working states, the application range is wide, and the experimental accuracy is high;
2. the amount of liquid and the amount of gas added into the simulated shaft are adjusted, the experimental device with the structure can simulate gas wells with different liquid accumulation degrees and different gas production rates, and the accurate analysis of the foam drainage process of the gas wells in different working states is realized;
3. the inclination angle of the shaft axis of the simulated shaft is adjusted, the experimental device with the structure can simulate different well sections of a gas well, and the accurate analysis of the flowing rule of the foam liquid in the different well sections is realized;
4. experimental oil is added into the simulated shaft through a power device to simulate the oil production of the stratum, so that the experimental device with the structure can accurately evaluate the liquid carrying capacity of the foaming agent under different oil contents;
the experimental method for simulating the staged fracturing horizontal well foam discharging process has the beneficial effects that:
1. by adopting the experimental device for simulating the staged fracturing horizontal well foam discharging process, on the basis of truly simulating the actual structure of the staged fracturing horizontal well, the respective real simulation of the liquid loading state of the staged fracturing horizontal well, the formation process of foam after foaming agent is filled and the flow form of foam liquid in different well sections is realized, so that the obtained experimental result can more accurately reflect the processes of foam generation and liquid carrying flow of the foaming agent in the staged fracturing horizontal well, and powerful support is provided for researching the liquid loading rule of a liquid production gas well and the optimal foaming agent concentration of an oil-gas-containing well under different oil rates.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device for simulating a staged fracturing horizontal well foam discharging process according to the invention;
FIG. 2 is a partially enlarged schematic view of FIG. 1 at I;
FIG. 3 is a schematic flow chart of an experimental method for simulating a staged fracturing horizontal well foam displacement process according to the present invention.
Reference numerals
1-simulated wellbore, 111-upper tubing, 112-middle tubing, 113-lower tubing, 121-upper casing, 122-middle casing, 123-lower casing, 13-tubing connection sleeve, 14-casing connection sleeve, 2-power plant, 21-air input device, 22-liquid input device, 3-dosing device, 4-packer, 5-chamber, 6-through hole, 7-shunt mechanism, 71-three-way joint, 8-liquid collecting device, 9-support device, 91-base, 92-slip, 101-first control valve, 102-second control valve, 103-third control valve, 104-fourth control valve, 105-blowdown valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1-2, an experimental apparatus for simulating a staged fracturing horizontal well foam discharging process comprises a simulated wellbore 1 for simulating a staged fracturing horizontal well shape and a power device 2 for simulating formation output, wherein the simulated wellbore 1 comprises a simulated oil pipe and a simulated casing pipe, the power device 2 comprises an air input device 21 for simulating formation gas production and a liquid input device 22 for simulating formation liquid production, the simulated oil pipe comprises an upper section oil pipe 111, a middle section oil pipe 112 and a lower section oil pipe 113 which are sequentially communicated, the simulated casing pipe comprises an upper section casing pipe 121, a middle section casing pipe 122 and a lower section casing pipe 123 which are sequentially communicated, the upper section oil pipe 111 and the upper section casing pipe 121 are coaxially arranged, a straight well section of the horizontal well is simulated, the middle section oil pipe 112 and the middle section casing pipe 122 are coaxially arranged, an inclined well section of the horizontal well is simulated, the lower section oil pipe 113 and the lower section casing pipe 123 are coaxially, the horizontal well section of the simulated horizontal well further comprises a dosing device 3 used for filling foaming agent, the power device 2 is communicated with the simulated well shaft 1, after the power device 2 works, the liquid accumulation state of the staged fracturing horizontal well is truly simulated, the dosing device is communicated with the simulated well shaft 1 through the dosing device 3, and after the foaming agent is filled, the foaming agent filling process, the foam forming process and the liquid carrying process of the staged fracturing horizontal well are truly simulated.
The experimental device for simulating the staged fracturing horizontal well foam discharging process of the embodiment preferably comprises oil pipes which are connected through oil pipe connecting sleeves 13, casing pipes which are connected through casing pipe connecting sleeves 14, a packer 4 is arranged between an upper casing pipe 121 and an upper casing pipe 111, the top opening of the upper casing pipe 121 is sealed, a pipeline is arranged from the top of the upper casing pipe 111, a gas well simulation output port is formed, an annular space which has the same structure as a horizontal well is formed, meanwhile, a plurality of packers 4 are arranged in the annular space between a lower casing pipe 113 and a lower casing pipe 123 to form a plurality of chambers 5, a through hole 6 is arranged on the lower casing pipe 113 corresponding to each chamber 5 to enable the chambers 5 to be communicated with the lower casing pipe 113, each chamber 5 is communicated with a power device 2 through a pipeline, a staged fracturing structure of the horizontal well is simulated, a simulated wellbore 1 which is similar to the staged fracturing horizontal well, during the use, medicine adding device 3 and upper casing 121 pass through the pipeline intercommunication, with power device 2 through pipeline and each cavity 5 intercommunication, through the volume of the liquid of adjustment each cavity 5 of adding and the speed of input gas, realize the accurate simulation of experimental apparatus to segmentation fracturing horizontal well foam drainage process, make according to the experimental result, obtain the best concentration of foaming agent under the wellbore hydrops of different degrees, the hydrops law of producing the liquid gas well and the best foaming agent concentration of oil gas well under different oil contents, provide powerful support for the segmentation fracturing horizontal well foam drainage technological parameter optimization of different operating condition now, application scope is wider, the experimental accuracy is higher.
Preferably, the liquid input device 22 is a peristaltic pump, the gas input device 21 is an air pump, and the liquid input device 22 is respectively connected with an oil storage tank and a water storage tank, so that experimental oil and water can be added into the simulated shaft 1 through the peristaltic pump, gas production of the stratum is simulated through the air pump, the foam discharging process of the oil-gas-containing well is truly simulated, and the optimal foaming agent concentration under different gas production rates and different oil-containing rates is obtained.
Preferably, a flow distribution mechanism 7 is arranged between the power device 2 and the lower section sleeve 123, a liquid inlet and a plurality of liquid outlets are arranged on the flow distribution mechanism 7, the liquid inlet is communicated with the power device 2, and the liquid outlets are communicated with the cavities 5 in a one-to-one correspondence manner. The shunting mechanism 7 is preferably formed by connecting a plurality of pipelines and the tee joint 71, so that liquid and gas can be simultaneously added into a plurality of cavities 5 from a single liquid inlet, the structure is simple, the preparation is convenient, and the real simulation of the staged fracturing structure of the horizontal well can be easily realized.
Example 2
As shown in fig. 1-2, the experimental apparatus for simulating the staged fracturing horizontal well foam discharging process in this embodiment has the same structure as that in embodiment 1, except that: the simulation shaft device is characterized by further comprising a liquid collecting device 8, wherein the liquid collecting device 8 is simultaneously communicated with the top end and the bottom end of the simulation shaft 1 and used for collecting waste liquid and waste gas output from the simulation shaft 1.
The experimental device for simulating the staged fracturing horizontal well foam discharging process preferably comprises a sewage tank and a plurality of pipelines, wherein the liquid collecting device 8 is communicated with the sewage tank through the top of the pipeline and the upper section oil pipe 111 and is communicated with the tail end of the lower section sleeve 123 through the pipeline, the lower section sleeve 123 is arranged on the pipeline between the sewage tank and the sewage tank, so that the sewage valve 105 is closed in the foam discharging process, foam liquid is input into the sewage tank through the top of the upper section oil pipe 111, the collection of waste liquid and waste gas in the experimental process is realized, the sewage valve 105 is opened in the experimental device cleaning process, cleaning liquid is input into the sewage tank through the tail end of the lower section sleeve 123, the use and the cleaning of the experimental device are facilitated, the pollution-free effect of the experimental device is realized, the experimental process is more environment-friendly, and the environmental pollution is avoided.
Example 3
As shown in fig. 1-2, the experimental apparatus for simulating the staged fracturing horizontal well foam discharging process in this embodiment has the same structure as that in embodiment 2, except that: the simulation well bore simulation device further comprises a supporting device 9, wherein the supporting device 9 comprises a base 91 and a plurality of slips 92 which are rotatably arranged on the base 91, and the slips 92 are connected with the simulation well bore 1 in a clamping mode.
The experimental device for simulating the staged fracturing horizontal well foam row process is preferably characterized in that the base 91 is fixed on a wall through bolts, the slips 92 are fixed on the base 91 through bolts, the upper casing 121 is connected with the slips 92 in a clamping mode, so that the inclination angle of the central axis of the upper casing 121 can be adjusted by rotating the slips 92, real simulation of horizontal wells with different well inclination angles is achieved, an experimental result is more accurate, and the application range of the experimental device is expanded.
Example 4
As shown in fig. 1 to 3, an experimental method for simulating a staged fracturing horizontal well foam row process adopts the experimental device for simulating the staged fracturing horizontal well foam row process, and comprises the following steps: the method comprises the following steps: setting a simulation shaft 1: assembling a simulated shaft 1, adjusting the inclination angle of the axis of the simulated shaft 1, and simulating the actual structure of the staged fracturing horizontal well; step two: setting the liquid accumulation state of the gas well: inputting water and oil with experiment demand into the simulated shaft 1 through the power device 2, and simulating the liquid accumulation state of the staged fracturing horizontal well; step three: setting a gas well dosing state: adding a foaming agent into the simulated shaft 1 through a dosing device 3, and simulating a technological process of injecting the foaming agent into the staged fracturing horizontal well; step four: setting the working state of gas well effusion: inputting air into the simulated shaft 1 through the power device 2 to simulate a gas production process and a foam drainage process of the stratum; step five: a cleaning device: clean water is input into the simulated shaft 1 through the power device 2, and the simulated shaft 1 is cleaned.
In the experimental method for simulating the foam discharging process of the staged fracturing horizontal well, by adopting the experimental device for simulating the foam discharging process of the staged fracturing horizontal well, preferably, a first control valve 101 is arranged between the air input device 21 and the simulated shaft 1, a second control valve 102 is arranged on a pipeline between the liquid input device 22 and the simulated shaft 1, a third control valve 103 is arranged on a pipeline between the dosing device 3 and the simulated shaft 1, a fourth control valve 104 is arranged on a pipeline between the liquid collecting device 8 and the simulated shaft 1, and one-way valves are arranged between the dosing device 3 and the upper casing 121 and between the power device 2 and the flow dividing mechanism 7, so that the gas-liquid flow direction can be controlled, the method has the advantages that the accumulated liquid state, the foaming agent filling process, the foam forming process and the liquid carrying process of the staged fracturing horizontal well are simulated respectively, during experiment, the upper-section sleeve 121 can be fixed through selecting the proper slips 92, the real simulation of the horizontal wells with different well inclination angles is realized, the effect of the foaming agent on gas wells with different yields is simulated through adjusting the output power of the air pump, the research on the optimal concentration of the foaming agent under the accumulated liquids with different degrees is realized through adjusting the accumulated liquid height in the simulated shaft 1, the research on the optimal concentration of the foaming agent under the oil-containing rate of the oil-containing gas well is realized through adding oil into the accumulated liquids, the experiment method is simple, the obtained result can truly reflect the foaming process and the liquid carrying capacity of the foaming agent in the staged fracturing horizontal well, and powerful support is provided for the optimization of foam discharging process parameters of the staged fracturing horizontal well.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail by referring to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modifications or equivalent substitutions may be made to the present invention, and all technical solutions and modifications without departing from the spirit and scope of the invention should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides an experimental apparatus of horizontal well foam row technology is arranged to simulation staged fracturing which characterized in that: the device comprises a simulation shaft for simulating the shape of the staged fracturing horizontal well, a power device for simulating gas and/or liquid production of a stratum, and a dosing device for injecting a foaming agent, wherein the dosing device and the power device are respectively communicated with the simulation shaft to simulate the structure of the staged fracturing horizontal well during foam drainage.
2. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 1, wherein: the simulation shaft comprises a simulation oil pipe and a simulation casing pipe, the simulation oil pipe and the simulation casing pipe are coaxially arranged, and an annular space structure between the oil pipe and the casing pipe of the horizontal well is simulated.
3. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 2, wherein: the simulation oil pipe comprises an upper section oil pipe, a middle section oil pipe and a lower section oil pipe which are sequentially communicated, the simulation sleeve comprises an upper section sleeve, a middle section sleeve and a lower section sleeve which are sequentially communicated, the upper section oil pipe and the upper section sleeve are coaxially arranged, the straight well section of the horizontal well is simulated, the middle section oil pipe and the middle section sleeve are coaxially arranged, the inclined well section of the horizontal well is simulated, and the lower section oil pipe and the lower section sleeve are coaxially arranged, so that the horizontal well section of the horizontal well is simulated.
4. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 3, wherein: the packer divides an annular space between the lower section oil pipe and the lower section casing pipe into a plurality of chambers, the chambers are communicated with the power device and communicated with the simulation oil pipe through holes arranged on the lower section oil pipe, and the staged fracturing structure of the horizontal well is simulated.
5. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 4, is characterized in that: the power device with be provided with the reposition of redundant personnel mechanism between the hypomere sleeve pipe, be provided with inlet and a plurality of liquid outlet on the reposition of redundant personnel mechanism, the inlet with power device intercommunication, the liquid outlet with the cavity one-to-one communicates.
6. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 1, wherein: the power device comprises an air input device for simulating gas production of the stratum and a liquid input device for simulating liquid production of the stratum.
7. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 1, wherein: the simulation shaft is characterized by further comprising a liquid collecting device, wherein the liquid collecting device is simultaneously communicated with the top end and the bottom end of the simulation shaft and used for collecting waste liquid and waste gas output from the simulation shaft.
8. The experimental device for simulating the staged fracturing horizontal well foam discharging process as claimed in claim 1, wherein: the simulation device comprises a simulation shaft, a support device and at least one angle adjusting mechanism, wherein the angle adjusting mechanism is matched with the simulation shaft and used for adjusting the inclination angle of the shaft axis of the simulation shaft.
9. The experimental device for simulating the staged fracturing horizontal well foam discharging process according to claim 8, wherein the experimental device comprises: the supporting device comprises a base and a plurality of slips rotatably arranged on the base, and the slips are connected with the simulated shaft in a clamping manner.
10. An experimental method for simulating a staged fracturing horizontal well foam discharging process is characterized by comprising the following steps of: the experimental device for simulating the staged fracturing horizontal well foam discharging process is adopted, and comprises the following steps:
the method comprises the following steps: setting a simulated shaft: assembling a simulated shaft, adjusting the inclination angle of the axis of the simulated shaft, and simulating the actual structure of the staged fracturing horizontal well;
step two: setting the liquid accumulation state of the gas well: inputting water and oil with experiment demand into a simulated shaft through a power device, and simulating the liquid accumulation state of the staged fracturing horizontal well;
step three: setting a gas well dosing state: adding a foaming agent into the simulated shaft through a dosing device, and simulating a technological process of injecting the foaming agent into the staged fracturing horizontal well;
step four: setting the working state of gas well effusion: inputting air into the simulated shaft through a power device, and simulating a gas production process and a foam drainage process of the stratum;
step five: a cleaning device: clean water is input into the simulated shaft through a power device, and the simulated shaft is cleaned.
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