CN113006742A - Dynamic evaluation device and method for simulating paraffin removal and prevention agent of oil casing shaft - Google Patents
Dynamic evaluation device and method for simulating paraffin removal and prevention agent of oil casing shaft Download PDFInfo
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- CN113006742A CN113006742A CN202110308830.0A CN202110308830A CN113006742A CN 113006742 A CN113006742 A CN 113006742A CN 202110308830 A CN202110308830 A CN 202110308830A CN 113006742 A CN113006742 A CN 113006742A
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- 239000012188 paraffin wax Substances 0.000 title claims abstract description 66
- 230000002265 prevention Effects 0.000 title claims abstract description 35
- 238000011156 evaluation Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 90
- 239000001993 wax Substances 0.000 claims abstract description 31
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 230000008021 deposition Effects 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims description 83
- 238000006073 displacement reaction Methods 0.000 claims description 55
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 16
- 239000008398 formation water Substances 0.000 claims description 15
- 238000001556 precipitation Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims 1
- 238000005137 deposition process Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 72
- 230000005764 inhibitory process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000004018 waxing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013142 basic testing Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010227 cup method (microbiological evaluation) Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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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
- E21B47/00—Survey of boreholes or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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Abstract
The invention discloses a dynamic evaluation device for wax removing and preventing agents of a simulated oil jacket shaft, which comprises a sample preparation device, an accommodating component, the simulated oil jacket shaft, a separator, a single-phase four-way valve, a branch pipeline, an inlet valve, an inlet pressure gauge, an outlet valve, a gas flowmeter, branch pipelines and connecting pipelines. The invention also discloses an evaluation method adopting the device for dynamically evaluating the paraffin removal and prevention agent of the simulated oil pipe, which comprises the following steps: preparing an experimental sample, connecting an experimental device, adjusting the temperature of a thermostat, injecting fluid, simulating a shaft wax deposition process, and performing wax deposition evaluation, wax removal evaluation and wax prevention evaluation, so that dynamic evaluation can be realized as a test condition, the flowing state of the fluid in the shaft of the oil jacket can be simulated, the flowing requirement of an oil-gas well can be met, and the dynamic evaluation device and method for the wax removal and prevention agent can meet the underground condition of high temperature and high pressure.
Description
Technical Field
The invention relates to the technical field of oil and gas development, in particular to a device and a method for dynamically evaluating paraffin removal and prevention agents of a simulated oil casing shaft.
Background
The method is characterized in that the problem of paraffin precipitation of a shaft and a pipeline is often faced in the oil and gas exploitation process, the safe and efficient exploitation of a gas well is seriously influenced, paraffin removal and paraffin prevention are often carried out by using a paraffin removal and prevention agent, and the existing paraffin removal and prevention agent effect evaluation method comprises an automatic paraffin removal and prevention agent evaluation instrument, a paraffin deposition cup method, a cold finger method and a loop method. In addition, the existing evaluation device and method for the paraffin removal and prevention agent are mainly designed based on static paraffin deposition and paraffin deposition of a ground gathering and transportation pipe network, are not suitable for the requirement of evaluating the effect of the paraffin removal and prevention agent of a shaft, and mainly show that: firstly, the existing methods mostly take static evaluation as a basic test condition and do not meet the flowing requirement of an oil-gas well; secondly, the existing dynamic evaluation device and method for the paraffin removal and prevention agent are mainly aimed at the evaluation of paraffin precipitation of a ground pipe network and do not meet the underground conditions of high temperature and high pressure; and thirdly, the existing device is a single-pipe flow, and the flowing state of the fluid in the oil casing well bore cannot be simulated. The invention provides a device and a method for dynamically evaluating a paraffin removal and prevention agent of a simulated oil casing well bore.
Disclosure of Invention
The invention aims to provide a device and a method for dynamically evaluating a paraffin removal and inhibition agent of a simulated oil casing shaft, aiming at solving the problems that the existing method in the prior art mostly takes static evaluation as a basic test condition and does not meet the flowing requirement of an oil-gas well; the existing dynamic evaluation device and method for the paraffin removal and prevention agent are mainly aimed at the evaluation of paraffin precipitation of a ground pipe network and do not meet the underground conditions of high temperature and high pressure; the existing device adopts single-pipe flow and cannot simulate the flowing state of oil jacket well bore fluid.
In order to achieve the purpose, the dynamic evaluation device for the paraffin removal and prevention agent of the simulated oil jacket shaft comprises a sample preparation device, a containing assembly, the simulated oil jacket shaft, a separator, a single-phase four-way valve, a branch pipe line, an inlet valve, an inlet pressure gauge, an outlet valve, a gas flowmeter, a branch pipe line and a connecting pipe line, wherein the containing assembly comprises a first piston type middle container filled with an oil-gas mixture, a second piston type middle container filled with formation water and a third piston type middle container filled with the paraffin removal and prevention agent, the first piston type middle container, the second piston type middle container and the third piston type middle container are all communicated with one end of the single-phase four-way valve, the other end of the single-phase four-way valve is communicated with one end of the simulated oil jacket shaft through the branch pipe line, and the inlet valve and the inlet pressure gauge are sequentially arranged on the branch, the other end of the simulation oil jacket shaft is communicated with the separator through the connecting pipeline, the outlet pressure gauge and the outlet valve are sequentially arranged on the connecting pipeline, the separator is communicated with the gas flowmeter through the branch pipeline, and the sample preparation device is communicated with the first piston type middle container.
The first piston type intermediate container comprises a first displacement pump, a first connecting pipe, a first valve, a first intermediate container and a first high-pressure pipeline, wherein the output end of the first displacement pump is communicated with the first intermediate container through the first connecting pipe, the first valve is arranged on the first connecting pipe, one end of the first high-pressure pipeline is communicated with the first intermediate container, and the other end of the first high-pressure pipeline is communicated with the single-phase four-way valve;
the second piston type intermediate container comprises a second displacement pump, a second connecting pipe, a second valve, a second intermediate container and a second high-pressure pipeline, the output end of the second displacement pump is communicated with the second intermediate container through the second connecting pipe, the second valve is arranged on the second connecting pipe, one end of the second high-pressure pipeline is communicated with the second intermediate container, and the other end of the second high-pressure pipeline is communicated with the single-phase four-way valve;
the third piston type intermediate container comprises a third displacement pump, a third connecting pipe, a third valve, a third intermediate container and a third high-pressure pipeline, the output end of the third displacement pump is communicated with the third intermediate container through the third connecting pipe, the third valve is arranged on the third connecting pipe, one end of the third high-pressure pipeline is communicated with the third intermediate container, and the other end of the third high-pressure pipeline is communicated with the single-phase four-way valve.
The first intermediate container comprises a first cylinder, a first bottom cover, a first top cover, a first piston, a first fluid inlet and a first fluid outlet, the first cylinder is internally provided with a cavity, the first piston is arranged inside the first cylinder, the first bottom cover and the first top cover are respectively arranged at two ends of the first cylinder, the first bottom cover is provided with the first fluid inlet, the first top cover is provided with the first fluid outlet, the first fluid inlet is communicated with the first connecting pipe, and the first fluid outlet is communicated with the first high-pressure pipeline;
the second intermediate container comprises a second cylinder, a second bottom cover, a second top cover, a second piston, a second fluid inlet and a second fluid outlet, the second cylinder is internally provided with a cavity, the second piston is arranged in the second cylinder, the second bottom cover and the second top cover are respectively arranged at two ends of the second cylinder, the second bottom cover is provided with the second fluid inlet, the second top cover is provided with the second fluid outlet, the second fluid inlet is communicated with the second connecting pipe, and the second fluid outlet is communicated with the second high-pressure pipeline;
the third intermediate container comprises a third cylinder, a third bottom cover, a third top cover, a third piston, a third fluid inlet and a third fluid outlet, the third cylinder is internally provided with a cavity, the third piston is arranged in the third cylinder, the third bottom cover and the third top cover are respectively arranged at two ends of the third cylinder, the third bottom cover is provided with the third fluid inlet, the third top cover is provided with the third fluid outlet, the third fluid inlet is communicated with the third connecting pipe, and the third fluid outlet is communicated with the third high-pressure pipeline.
The simulation oil jacket shaft comprises a cylinder body, a simulation sleeve, a simulation oil pipe, a sealing hanging piece, a simulation sleeve top cover and a simulation sleeve bottom cover, wherein the simulation sleeve and the simulation sleeve are arranged in the cylinder body, the simulation oil pipe is hung in the simulation sleeve through the sealing hanging piece, the simulation sleeve top cover and the simulation sleeve bottom cover are respectively arranged at two ends of the cylinder body, a general inlet is formed in the simulation sleeve top cover, and the simulation sleeve bottom cover is provided with a general outlet.
Wherein, the separator includes erlenmeyer flask and rubber buffer, the rubber buffer with erlenmeyer flask sealing connection, total fluid entry and venthole have on the rubber buffer, just total fluid entry with connecting line intercommunication, the venthole with divide the pipeline intercommunication.
The device for dynamically evaluating the paraffin removal and prevention agent of the simulated oil jacket shaft further comprises a thermostat, wherein the second intermediate container, the third intermediate container and the simulated oil jacket shaft are arranged in the thermostat.
The invention also provides a method for adopting the device for dynamically evaluating the paraffin removal and inhibition agent of the simulated oil jacket shaft, which comprises the following steps:
the method comprises the following steps: putting the raw materials into the sample preparation device according to a preset oil-gas ratio, opening the first valve to pressurize to the formation pressure, heating to the formation temperature, fully stirring and mixing, and simultaneously respectively putting formation water and a paraffin removal and prevention agent into the second cylinder and the third cylinder;
step two: weighing the simulated oil pipe by using an electronic balance to obtain m1Adjusting the constant temperature box to the test temperature, and closing all valves at the same time;
step three: adjusting the injection pressure of the first displacement pump and the second displacement pump to be constant and consistent, slowly opening the first valve, the second valve, the single-phase four-way valve and the inlet valve in sequence, and waiting for the pressure of the inlet pressure gauge to be equal to the pressure of the second displacement pumpWhen the injection pressure of a displacement pump is consistent, the outlet valve is slowly opened until the pressure difference between the outlet pressure gauge and the inlet pressure gauge is less than a set value, the volume of the oil and water flowing out is recorded by using the gas flowmeter, and the weight of the oil and water is respectively weighed to be mo、mwSimultaneously, recording the separated gas amount by using the gas flowmeter;
step four: after wax deposition of the simulated oil sleeve shaft is finished, all valves are closed, the top cover of the simulated casing and the bottom cover of the simulated casing are opened, the simulated oil pipe is taken out, and the weight of the simulated oil pipe with wax deposition is weighed to be m2Then calculating the wax precipitation rate;
step five: the simulated oil pipe which is taken out from the step four and is subjected to wax precipitation is re-installed into the simulated casing pipe, the oil-gas mixture and the formation water outlet valve of the single-phase four-way valve are closed, the paraffin remover valve of the single-phase four-way valve is opened at the same time, and the paraffin remover is injected into the simulated casing pipe in a constant pressure mode; after finishing, closing all valves, then opening the simulation sleeve top cover and the simulation sleeve bottom cover, taking out the simulation oil pipe, and weighing the simulation oil pipe with the weight of m3Calculating the wax removal rate;
step six: keeping the injection pressure of the first displacement pump, the second displacement pump and the third displacement pump constant and consistent under the same conditions of fluid components, temperature, pressure, flow rate and injection time in the third step, and slowly opening the first valve, the second valve and the third valve in sequence, when the pressure of the inlet pressure gauge is consistent with the injection pressure of the first displacement pump, the injection pressure of the second displacement pump and the injection pressure of the third displacement pump respectively, after the outlet valve is slowly opened and the pressure difference between the outlet pressure gauge and the inlet pressure gauge is adjusted to be smaller than the preset value, after the experiment is finished, and closing all the valves, opening the simulation sleeve top cover and the simulation sleeve bottom cover, taking out the simulation oil pipe, and weighing the paraffin precipitation simulation oil pipe with the weight of m after paraffin control.4And calculating the wax control rate.
The invention has the beneficial effects that: the containing assembly comprises a first piston type intermediate container filled with oil-gas mixture, a second piston type intermediate container filled with formation water and a third piston type intermediate container filled with paraffin removing and preventing agent, the first piston type intermediate container, the second piston type intermediate container and the third piston type intermediate container are all communicated with one end of the single-phase four-way valve, the other end of the single-phase four-way valve is communicated with one end of the simulated oil jacket shaft through the branch pipeline, the inlet valve and the inlet pressure gauge are sequentially arranged on the branch pipeline, the other end of the simulated oil jacket shaft is communicated with the separator through the connecting pipeline, the connecting pipeline is sequentially provided with the outlet pressure gauge and the outlet valve, the separator is communicated with the gas flowmeter through the branch pipeline, and the sample distributor is communicated with the first piston type middle container. Through the structural arrangement, dynamic evaluation can be realized as a test condition, the flowing state of the fluid in the oil casing shaft can be simulated, the flowing requirement of an oil-gas well is met, and the device and the method for dynamically evaluating the paraffin removal and prevention agent can meet the underground condition of high temperature and high pressure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a simulated oil jacket wellbore of the present invention.
Fig. 2 is a schematic structural diagram of the device for dynamically evaluating the paraffin removal and inhibition agent of the simulated oil casing well bore.
Figure 3 is a cross-sectional view of a simulated oil jacket wellbore of the present invention.
FIG. 4 is a top view of a simulated oil jacket wellbore of the present invention.
1-sample preparation device, 2-metal rod, 3-first displacement pump, 4-first connecting pipe, 5-first valve, 6-first fluid inlet, 7-first bottom cover, 8-first piston, 9-first cylinder, 10-first intermediate container, 11-first top cover, 12-first fluid outlet, 13-first high-pressure pipeline, 14-insulating sleeve, 15-second displacement pump, 16-second connecting pipe, 17-second valve, 18-second fluid inlet, 19-second bottom cover, 20-second piston, 21-second cylinder, 22-second intermediate container, 23-second top cover, 24-second fluid outlet, 25-second high-pressure pipeline, 26-third displacement pump, 27-third connecting pipe, 28-third valve, 29-third fluid inlet, 30-third bottom cover, 31-third piston, 32-third cylinder, 33-third middle container, 34-third top cover, 35-third fluid outlet, 36-third high pressure pipeline, 37-single phase four-way valve, 38-branch pipeline, 39-inlet valve, 40-inlet pressure gauge, 41-simulation oil jacket shaft, 42-total outlet, 43-simulation sleeve top cover, 44-simulation sleeve, 45-cylinder, 46-simulation oil pipe, 47-simulation sleeve bottom cover, 48-total inlet, 49-sealing hanging sheet, 50-sealing pad, 52-outlet pressure gauge, 53-outlet valve, 54-constant temperature tank, 55-connecting pipeline, 56-total fluid inlet, 56-total fluid outlet, 57-separator, 58-conical flask, 59-rubber plug, 60-gas outlet, 61-branch line and 62-gas flowmeter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 4, the invention provides a dynamic evaluation device for paraffin removal and prevention agent in a simulated oil jacket well bore 41, comprising a sample preparation device 1, a containing assembly, a simulated oil jacket well bore 41, a separator 57, a single-phase four-way valve 37, a branch pipe 38, an inlet valve 39, an inlet pressure gauge 40, an outlet pressure gauge 52, an outlet valve 53, a gas flow meter 62, a branch pipe 61 and a connecting pipe 55, wherein the containing assembly comprises a first piston type intermediate container containing oil-gas mixture, a second piston type intermediate container containing formation water and a third piston type intermediate container containing paraffin removal and prevention agent, the first piston type intermediate container, the second piston type intermediate container and the third piston type intermediate container are all communicated with one end of the single-phase four-way valve 37, the other end of the single-phase four-way valve 37 is communicated with one end of the simulated oil jacket well bore 41 through the branch pipe 38, the inlet valve 39 and the inlet pressure gauge 40 are sequentially arranged on the branch pipeline 38, the other end of the simulated oil jacket shaft 41 is communicated with the separator 57 through the connecting pipeline 55, the outlet pressure gauge 52 and the outlet valve 53 are sequentially arranged on the connecting pipeline 55, the separator 57 is communicated with the gas flowmeter 62 through the branch pipeline 61, and the sample preparation device 1 is communicated with the first piston type intermediate container.
The first piston type intermediate container comprises a first displacement pump 3, a first connecting pipe 4, a first valve 5, a first intermediate container 10 and a first high-pressure pipeline 13, the output end of the first displacement pump 3 is communicated with the first intermediate container 10 through the first connecting pipe 4, the first valve 5 is arranged on the first connecting pipe 4, one end of the first high-pressure pipeline 13 is communicated with the first intermediate container 10, and the other end of the first high-pressure pipeline 13 is communicated with the single-phase four-way valve 37;
the second piston type intermediate container comprises a second displacement pump 15, a second connecting pipe 16, a second valve 17, a second intermediate container 22 and a second high-pressure pipeline 25, the output end of the second displacement pump 15 is communicated with the second intermediate container 22 through the second connecting pipe 16, the second valve 17 is arranged on the second connecting pipe 16, one end of the second high-pressure pipeline 25 is communicated with the second intermediate container 22, and the other end of the second high-pressure pipeline 25 is communicated with the single-phase four-way valve 37;
the third piston type intermediate container comprises a third displacement pump 26, a third connecting pipe 27, a third valve 28, a third intermediate container 33 and a third high-pressure pipeline 36, wherein the output end of the third displacement pump 26 is communicated with the third intermediate container 33 through the third connecting pipe 27, the third valve 28 is arranged on the third connecting pipe 27, one end of the third high-pressure pipeline 36 is communicated with the third intermediate container 33, and the other end of the third high-pressure pipeline 36 is communicated with the single-phase four-way valve 37.
The first intermediate container 10 includes a first cylinder 9, a first bottom cover 7, a first top cover 11, a first piston 8, a first fluid inlet 6 and a first fluid outlet 12, the first cylinder 9 is a cavity, the first piston 8 is disposed inside the first cylinder 9, the first bottom cover 7 and the first top cover 11 are respectively disposed at two ends of the first cylinder 9, the first bottom cover 7 is provided with the first fluid inlet 6, the first top cover 11 is provided with the first fluid outlet 12, the first fluid inlet 6 is communicated with the first connecting pipe 4, and the first fluid outlet 12 is communicated with the first high-pressure pipeline 13;
the second intermediate container 22 includes a second cylinder 21, a second bottom cover 19, a second top cover 23, a second piston 20, a second fluid inlet 18 and a second fluid outlet 24, the interior of the second cylinder 21 is a cavity, the second piston 20 is disposed inside the second cylinder 21, the second bottom cover 19 and the second top cover 23 are respectively disposed at two ends of the second cylinder 21, the second bottom cover 19 is provided with the second fluid inlet 18, the second top cover 23 is provided with the second fluid outlet 24, the second fluid inlet 18 is communicated with the second connecting pipe 16, and the second fluid outlet 24 is communicated with the second high-pressure pipeline 25;
the third intermediate container 33 includes a third cylinder 32, a third bottom cover 30, a third top cover 34, a third piston 31, a third fluid inlet 29 and a third fluid outlet 35, the third cylinder 32 is a hollow interior, the third piston 31 is disposed inside the third cylinder 32, the third bottom cover 30 and the third top cover 34 are respectively disposed at two ends of the third cylinder 32, the third bottom cover 30 is provided with the third fluid inlet 29, the third top cover 34 is provided with the third fluid outlet 35, the third fluid inlet 29 is communicated with the third connecting pipe 27, and the third fluid outlet 35 is communicated with the third high pressure pipeline 36.
The simulation oil casing wellbore 41 comprises a cylinder 45, a simulation casing 44, a simulation oil pipe 46, a sealing hanging sheet 49, a simulation casing top cover 43 and a simulation casing bottom cover 47, wherein the simulation casing 44 and the simulation casing 44 are arranged inside the cylinder 45, the simulation oil pipe 46 is suspended inside the simulation casing 44 through the sealing hanging sheet 49, the simulation casing top cover 43 and the simulation casing bottom cover 47 are respectively arranged at two ends of the cylinder 45, a main inlet 48 is arranged on the simulation casing top cover 43, and the simulation casing bottom cover 47 is provided with a main outlet 42.
The separator 57 comprises a conical flask 58 and a rubber plug 59, the rubber plug 59 is connected with the conical flask 58 in a sealing manner, the rubber plug 59 is provided with a total fluid inlet 56 and an air outlet 60, the total fluid inlet 56 is communicated with the connecting pipeline 55, and the air outlet 60 is communicated with the branch pipeline 61.
The dynamic evaluation device for the paraffin removal and inhibition agent of the simulated oil casing well bore 41 further comprises a constant temperature box 54, and the second intermediate container 22, the third intermediate container 33 and the simulated oil casing well bore 41 are arranged in the constant temperature box 54.
The simulated oil casing well bore 41 comprises a sealing gasket 50, and the sealing gasket 50 is arranged at the upper part of the sealing hanging sheet 49.
The device for dynamically evaluating the paraffin removal and inhibition agent in the simulated oil casing well bore 41 further comprises a thermal insulation sleeve 14, and the thermal insulation sleeve 14 is wound and attached to the outside of the first high-pressure pipeline 13.
In the present embodiment, the sample preparation device 1 is communicated with the first piston type intermediate container through a metal rod 2, the sample preparation device 1 is mainly used for preparing and containing formation fluid (oil-gas mixture) at high temperature and high pressure, the containing assembly comprises a first piston type intermediate container containing oil-gas mixture, a second piston type intermediate container containing formation water and a third piston type intermediate container containing paraffin removal and prevention agent, so as to be used for containing three fluids, the first intermediate container 10, the second intermediate container 22 and the third intermediate container 33 are respectively formed by connecting the first top cover 11, the second top cover 23 and the third top cover 34 which are detachable, the first bottom cover 7, the second bottom cover 19 and the third bottom cover 30 which are detachable and the first cylinder 9, the second cylinder 21 and the third cylinder 32 which are detachable, the first cylinder 9, the second cylinder 21 and the third cylinder 32 are respectively connected by external threads; the first piston 8 is arranged in the first intermediate container 10, the second piston 20 is arranged in the second intermediate container 22, the third piston 31 is arranged in the third intermediate container 33, the first piston 8, the second piston 20 and the third piston 31 are made of cylindrical stainless steel materials, the first piston 8, the second piston 20 and the third piston 31 divide the interior of the first intermediate container into an upper part and a lower part, an oil-gas mixture, upper formation water in the second intermediate container 22 and an upper part in the third intermediate container 33 are respectively arranged at the upper part in the first intermediate container 10, paraffin removal and prevention agents are respectively arranged at the upper parts in the first intermediate container, the first fluid outlet 12, the second fluid outlet 24 and the third fluid outlet 35 which are sequentially arranged at the centers of the first top cover 11, the second top cover 23 and the third top cover 34 are respectively corresponding to the first high-pressure pipeline 13, The second high pressure line 25 is communicated with the third high pressure line 36, hydraulic oil is filled in the lower portions of the first intermediate container 10, the second intermediate container 22 and the third intermediate container 33, and the first fluid inlet 6, the second fluid inlet 18 and the third fluid inlet 29, which are sequentially arranged at the centers of the first bottom cover 7, the second bottom cover 19 and the third bottom cover 30, are respectively connected with the corresponding first connecting pipe 4, the second connecting pipe 16 and the third connecting pipe 27.
The simulation casing 44 is composed of a long and thin thick steel cylinder and can bear high temperature and high pressure in an actual well bore;
the simulation oil pipe 46 is made of a thin and long steel pipe, the length of the pipe is slightly smaller than that of the simulation casing 44, the sealing hanging piece 49 extending outwards is arranged at the top end of the pipe, and the simulation oil pipe 46 can be hung in the simulation casing 44. The simulation casing top cover 43 and the simulation casing bottom cover 47 are respectively connected with the top end and the bottom end of the simulation casing 44 through threads to seal the simulation casing 44 and the simulation oil pipe 46, the sealing gasket 50 is an annular rubber sealing gasket 50 and is arranged on the upper portion of the extension type sealing hanging piece 49 of the simulation oil pipe 46 to elastically seal the annular space between the simulation oil pipe 46 and the simulation casing 44.
The separator 57 is matched with the rubber plug 59 through the conical flask 58 to form oil-gas-water separation, and separated oil and water are retained in the conical flask 58. The gas flow meter 62 is used for metering the amount of gas separated by the separator 57. The first displacement pump 3, the second displacement pump 15 and the third displacement pump 26 are respectively used for providing power for fluid conveying, controlling the flow rate and inflow pressure of the fluid, the first valve 5, the second valve 17 and the third valve 28 are respectively used for controlling the hydraulic conveying and stopping in the first displacement pump 3, the second displacement pump 15 and the third displacement pump 26, the inlet valve 39 is used for buffering and regulating the pressure of the oil-gas mixture, the formation water and the paraffin inhibitor in the first intermediate container 10, the second intermediate container 22 and the third intermediate container 33 flowing into the inlet end of the simulation oil pipe 46, the insulation sleeve 14 is wound outside the first high-pressure pipeline 13 and outside the single-phase four-way valve 37 and is used for placing the heat dissipation of the fluid along the first high-pressure pipeline 13, and the inlet pressure gauge 40 is used for monitoring the pressure of the inlet-end injection fluid, the outlet pressure gauge 52 is used to monitor the pressure of the outlet-side injected fluid, and the thermostat 54 is an air bath and is mainly used to control the temperature in the simulated oil pipe 46 during the experiment. Through the structural arrangement, dynamic evaluation can be realized as a test condition, the flowing state of the fluid in the oil jacket shaft 41 can be simulated, the flowing requirement of an oil-gas well is met, and the device and the method for dynamically evaluating the paraffin removal and prevention agent can meet the underground condition of high temperature and high pressure.
The invention also provides a method for adopting the dynamic evaluation device for simulating the paraffin removal and inhibition agent of the oil jacket well shaft 41, which comprises the following steps:
the method comprises the following steps: putting the raw materials into the sample preparation device 1 according to a preset oil-gas ratio, opening the first valve 5, pressurizing to the formation pressure, heating to the formation temperature, fully stirring and mixing, and simultaneously respectively putting formation water and a paraffin removal and prevention agent into the second cylinder 21 and the third cylinder 32;
step two: the simulated oil pipe 46 is weighed to be m by using an electronic balance1And adjusting the incubator 54 to a test temperature while closing all valves;
step three: adjusting the injection pressure of the first displacement pump 3 and the second displacement pump 15 to be constant and keeping the constant, slowly opening the first valve 5, the second valve 17, the single-phase four-way valve 37 and the inlet valve 39 in sequence, slowly opening the outlet valve 53 when the pressure of the inlet pressure gauge 40 is consistent with the injection pressure of the first displacement pump 3, and recording the volume of the oil water flowing out by using the gas flowmeter 62 when the pressure difference between the outlet pressure gauge 52 and the inlet pressure gauge 40 is smaller than a set value, and respectively weighing the weight of the oil water to be mo、mwSimultaneously, the separated gas amount is recorded by the gas flowmeter 62;
step four: after the wax precipitation of the simulated oil casing shaft 41 is finished, closing all valves, opening the simulated casing top cover 43 and the simulated casing bottom cover 47, taking out the simulated oil pipe 46, and weighing the wax precipitation of the simulated oil pipe 46 to be m2Then calculating the wax precipitation rate; namely:
w-wax precipitation percentage in the formula;
m1-simulated tubing 46 weight, g;
m2-knotSimulated tubing after waxing 46 weight, g;
mocrude oil weight, g.
Step five: the simulation oil pipe 46 with the wax deposition taken out in the fourth step is installed back into the simulation sleeve 44 again, the oil-gas mixture and the formation water outlet valve 53 of the single-phase four-way valve 37 are closed, meanwhile, the paraffin remover valve of the single-phase four-way valve is opened, and the paraffin remover is injected into a fixed volume at constant pressure; after the completion of the operation, all the valves are closed, the simulation casing top cover 43 and the simulation casing bottom cover 47 are opened, the simulation oil pipe 46 is taken out, and the weight is weighed as m3Calculating the wax removal rate; namely:
in the formula, e represents the paraffin removal rate percent;
m1-simulated tubing 46 weight, g;
m2-simulated tubing 46 weight, g, after waxing;
m3 simulated tubing 46 weight, g, after paraffin removal test.
Step six: under the condition that the conditions of fluid components, temperature, pressure, flow rate and injection time in the third step are the same, the injection pressures of the first displacement pump 3, the second displacement pump 15 and the third displacement pump 26 are adjusted to be constant and consistent, the first valve 5, the second valve 17 and the third valve 28, the oil-gas mixture, the formation water and the wax-proofing agent outlet valve 53 of the single-phase four-way valve are opened slowly in sequence, when the pressure of the inlet pressure gauge 40 is respectively consistent with the injection pressures of the first displacement pump 3, the second displacement pump 15 and the third displacement pump 26, the outlet valve 53 is opened slowly, the pressure difference between the outlet pressure gauge 52 and the inlet pressure gauge 40 is adjusted to be smaller than a preset value, after the experiment is finished, all the valves are closed, the simulation casing top cover 43 and the simulation casing bottom cover 47 are opened, taking out the simulated oil pipe 46, and weighing the paraffin precipitation simulated oil pipe 46 with the weight of m after paraffin control4Calculating the wax control ratio, i.e.：
In the formula, f represents the wax control rate,%;
m1-simulated tubing 46 weight, g;
m2-simulated tubing 46 weight, g, after waxing;
m4 simulated tubing 46 weight, g, after wax control experiments.
In summary, the following steps: the invention relates to a dynamic evaluation device and an evaluation method for a paraffin removal and prevention agent, which belong to the technical field of oil and gas development, are used for dynamically evaluating the effect of the paraffin removal and prevention agent in a laboratory of a laboratory and provide technical support for paraffin removal and prevention work in the oil and gas exploitation process; in addition, dynamic evaluation can be realized as a test condition, the flowing state of the fluid in the oil casing well shaft 41 can be simulated, the flowing requirement of an oil-gas well is met, and the device and the method for dynamically evaluating the paraffin removal and prevention agent can meet the underground condition of high temperature and high pressure.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A dynamic evaluation device for simulating paraffin removal and prevention agents of an oil jacket shaft is characterized in that,
the device comprises a sample preparation device, a containing assembly, a simulated oil jacket shaft, a separator, a single-phase four-way valve, a branch pipe line, an inlet valve, an inlet pressure gauge, an outlet valve, a gas flowmeter, a branch pipe line and a connecting pipe line, wherein the containing assembly comprises a first piston type intermediate container filled with an oil-gas mixture, a second piston type intermediate container filled with formation water and a third piston type intermediate container filled with a paraffin removing and preventing agent, the first piston type intermediate container, the second piston type intermediate container and the third piston type intermediate container are all communicated with one end of the single-phase four-way valve, the other end of the single-phase four-way valve is communicated with one end of the simulated oil jacket shaft through the branch pipe line, the inlet valve and the inlet pressure gauge are sequentially arranged on the branch pipe line, and the other end of the simulated oil jacket shaft is communicated with the, the connecting pipeline is sequentially provided with the outlet pressure gauge and the outlet valve, the separator is communicated with the gas flowmeter through the branch pipeline, and the sample distributor is communicated with the first piston type middle container.
2. The device for dynamically evaluating the paraffin remover and inhibitor of a simulated oil jacket wellbore according to claim 1,
the first piston type intermediate container comprises a first displacement pump, a first connecting pipe, a first valve, a first intermediate container and a first high-pressure pipeline, wherein the output end of the first displacement pump is communicated with the first intermediate container through the first connecting pipe, the first valve is arranged on the first connecting pipe, one end of the first high-pressure pipeline is communicated with the first intermediate container, and the other end of the first high-pressure pipeline is communicated with the single-phase four-way valve;
the second piston type intermediate container comprises a second displacement pump, a second connecting pipe, a second valve, a second intermediate container and a second high-pressure pipeline, the output end of the second displacement pump is communicated with the second intermediate container through the second connecting pipe, the second valve is arranged on the second connecting pipe, one end of the second high-pressure pipeline is communicated with the second intermediate container, and the other end of the second high-pressure pipeline is communicated with the single-phase four-way valve;
the third piston type intermediate container comprises a third displacement pump, a third connecting pipe, a third valve, a third intermediate container and a third high-pressure pipeline, the output end of the third displacement pump is communicated with the third intermediate container through the third connecting pipe, the third valve is arranged on the third connecting pipe, one end of the third high-pressure pipeline is communicated with the third intermediate container, and the other end of the third high-pressure pipeline is communicated with the single-phase four-way valve.
3. The device for dynamically evaluating the paraffin remover and inhibitor of a simulated oil jacket wellbore according to claim 2,
the first intermediate container comprises a first cylinder, a first bottom cover, a first top cover, a first piston, a first fluid inlet and a first fluid outlet, the first cylinder is internally provided with a cavity, the first piston is arranged inside the first cylinder, the first bottom cover and the first top cover are respectively arranged at two ends of the first cylinder, the first bottom cover is provided with the first fluid inlet, the first top cover is provided with the first fluid outlet, the first fluid inlet is communicated with the first connecting pipe, and the first fluid outlet is communicated with the first high-pressure pipeline;
the second intermediate container comprises a second cylinder, a second bottom cover, a second top cover, a second piston, a second fluid inlet and a second fluid outlet, the second cylinder is internally provided with a cavity, the second piston is arranged in the second cylinder, the second bottom cover and the second top cover are respectively arranged at two ends of the second cylinder, the second bottom cover is provided with the second fluid inlet, the second top cover is provided with the second fluid outlet, the second fluid inlet is communicated with the second connecting pipe, and the second fluid outlet is communicated with the second high-pressure pipeline;
the third intermediate container comprises a third cylinder, a third bottom cover, a third top cover, a third piston, a third fluid inlet and a third fluid outlet, the third cylinder is internally provided with a cavity, the third piston is arranged in the third cylinder, the third bottom cover and the third top cover are respectively arranged at two ends of the third cylinder, the third bottom cover is provided with the third fluid inlet, the third top cover is provided with the third fluid outlet, the third fluid inlet is communicated with the third connecting pipe, and the third fluid outlet is communicated with the third high-pressure pipeline.
4. The device for dynamically evaluating the paraffin remover and inhibitor of a simulated oil jacket wellbore of claim 3,
the simulation oil jacket pit shaft includes barrel, simulation sleeve pipe, simulation oil pipe, sealed lacing film, simulation sleeve pipe top cap and simulation sleeve pipe bottom, the simulation sleeve pipe with the simulation sleeve pipe all set up in the inside of barrel, just simulation oil pipe passes through sealed lacing film hang in the inside of simulation sleeve pipe, simulation sleeve pipe top cap with simulation sleeve pipe bottom set up respectively in the both ends of barrel, just total entry has on the simulation sleeve pipe top cap, simulation sleeve pipe bottom has total export.
5. The device for dynamically evaluating the paraffin remover and inhibitor of a simulated oil jacket wellbore according to claim 4,
the separator includes erlenmeyer flask and rubber buffer, the rubber buffer with erlenmeyer flask sealing connection, total fluid entry and venthole have on the rubber buffer, just total fluid entry with connecting line communicates, the venthole with divide the pipeline intercommunication.
6. The device for dynamically evaluating the paraffin remover and inhibitor of a simulated oil jacket wellbore of claim 5,
the device for dynamically evaluating the paraffin removal and prevention agent of the simulated oil jacket shaft further comprises a thermostat, wherein the second intermediate container, the third intermediate container and the simulated oil jacket shaft are arranged in the thermostat.
7. The method for dynamically evaluating the paraffin removal and prevention agent of the simulated oil casing well bore according to claim 6, is characterized by comprising the following steps:
the method comprises the following steps: putting the raw materials into the sample preparation device according to a preset oil-gas ratio, opening the first valve to pressurize to the formation pressure, heating to the formation temperature, fully stirring and mixing, and simultaneously respectively putting formation water and a paraffin removal and prevention agent into the second cylinder and the third cylinder;
step two: weighing the simulated oil pipe by using an electronic balance to obtain m1And adjusting the incubator to the test temperature while closing the ovenA valve is arranged;
step three: adjusting the injection pressure of the first displacement pump and the injection pressure of the second displacement pump to be constant and consistent, slowly opening the first valve, the second valve, the single-phase four-way valve and the inlet valve in sequence, slowly opening the outlet valve when the pressure of the inlet pressure gauge is consistent with the injection pressure of the first displacement pump, recording the volume of the oil water flowing out by using the gas flowmeter when the pressure difference between the outlet pressure gauge and the inlet pressure gauge is smaller than a set value, and respectively weighing the weight of the oil water to be mo、mwSimultaneously, recording the separated gas amount by using the gas flowmeter;
step four: after wax deposition of the simulated oil sleeve shaft is finished, all valves are closed, the top cover of the simulated casing and the bottom cover of the simulated casing are opened, the simulated oil pipe is taken out, and the weight of the simulated oil pipe with wax deposition is weighed to be m2Then calculating the wax precipitation rate;
step five: cleaning the wax precipitation simulated oil pipe taken out in the fourth step, reloading the wax precipitation simulated oil pipe into the simulated sleeve, closing an oil-gas mixture and a formation water outlet valve of the single-phase four-way valve, simultaneously opening a paraffin remover valve of the single-phase four-way valve, and injecting the paraffin remover into a quantitative volume at constant pressure; after finishing, closing all valves, then opening the simulation sleeve top cover and the simulation sleeve bottom cover, taking out the simulation oil pipe, and weighing the simulation oil pipe with the weight of m3Calculating the wax removal rate;
step six: and (2) under the condition of keeping the same temperature, pressure, flow rate and injection time conditions as those in the third step, adjusting the injection pressures of the first displacement pump, the second displacement pump and the third displacement pump to be constant and consistent, slowly opening the first valve, the second valve and the third valve in sequence, and slowly opening the oil-gas mixture, formation water and paraffin inhibitor outlet valve of the single-phase four-way valve, and when the pressure of the inlet pressure gauge is respectively consistent with the injection pressures of the first displacement pump, the second displacement pump and the third displacement pump, slowly opening the outlet valve, and adjusting the pressure difference between the outlet pressure gauge and the inlet pressure gaugeAnd when the weight of the wax deposition simulation oil pipe is less than the preset value, closing all valves after the experiment is finished, opening the simulation sleeve top cover and the simulation sleeve bottom cover, taking out the simulation oil pipe, and weighing the weight of the wax deposition simulation oil pipe after wax prevention to be m4And calculating the wax control rate.
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