CN108956435A - A kind of analogue experiment method and device of the corrosion of high temperature and pressure reservoir - Google Patents
A kind of analogue experiment method and device of the corrosion of high temperature and pressure reservoir Download PDFInfo
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Abstract
The present invention provides the analogue experiment methods and device of a kind of high temperature and pressure reservoir corrosion.The analogue experiment method comprises determining that the rock forming mineral composition and constituent content of reservoir samples；According to the characteristic of fluid undergone in reservoir geology evolutionary process, the reaction solution of corrosion is determined；The strata temperature and pressure undergone in evolutionary process is buried according to reservoir, determines the temperature and pressure of the corrosion reaction of simulated experiment；According to the corrosion mode for burying reservoir in evolutionary process, the corrosion mode of simulated experiment is determined；Corrosion simulated experiment is carried out, the simulation of the corrosion to high temperature and pressure reservoir is completed.The present invention also provides a kind of imitative experimental appliances that can be used for the above method.Analogue experiment method and device of the invention can truly simulant bearing conditions of coal seam.
Description
Technical field
The present invention relates to a kind of experimental method and device more particularly to a kind of simulated experiment sides of high temperature and pressure reservoir corrosion
Method and device, belong to oil exploration technology field.
Background technique
Oil-gas exploration at present from shallow-layer to deep prospecting, thus problems faced be deep prospecting cost increase and
The increase of exploration risk.Maximum risk is whether the deep layer of oil-gas bearing basin has effective reservoir.
For the rock type of reservoir there are many multiplicity, including carbonate rock, clastic rock, volcanic rock and metamorphic rock, all can
The rock medium for meeting oil gas storage can be used as reservoir of oil and gas.This needs us to judge that these can be stored as oil gas
Medium whether develop reservoir space under the conditions of buried.For clastic rock, with the increase of buried depth, clastic rock by
The compaction of overlying rock enhances, and porosity is gradually reduced.Bury deeper, the porosity of clastic rock is smaller, however in the world
Upper many oil-gas bearing basins have been found that deep remains the reservoir of Higher porosity, one of them important reason is exactly deep
Corrosion has occurred in the particle of portion's clastic rock, produces secondary pore, to improve the porosity of rock, extends Deep Oil And Gas Exploration
The field of exploration.For volcanic reservoirs, not isopic zone, different lithology volcanic rock all there may be effective oil gas
Reservoir space.The development of China's western region volcanic rock reservoir is mainly influenced by weathering eluviation, whether shallow when early stage
Mineral dissolution readily soluble in volcanic rock can be formed dissolution porosity by the corrosion of deep fluid when portion's leaching or advanced stage, be
Preserving for oil gas provides space.The corrosion of carbonate rock is considered as forming the principal element of deep Favorable Reservoir.Therefore
The experiment for carrying out reservoir corrosion under the corrosion experiment of oil and gas reservoir, especially simulation deep layer high-temperature and high-pressure conditions is evaluation and pre-
Survey high risk, the important research means of area of lower exploration degree And Hydrocarbon Potential.
There are many research to corrosion experiment domestic at present, not only in oil-gas geology field, also apply in building engineering field
It is very extensive, have been developed that many carbonate rock corrosion experimental provisions (a kind of dissolved corrosion test device and its implementation, Shen
It please numbers 201510969903.5；Pressure-resistant multi-layer cavity corrosion device and its test method, application number 201210015034.9；
Three axis corrosion experimental provision of high pressure low temperature and its experimental method, application number 201210135924.3), and really rock corrosion at
Because of method (a kind of method and device of determining rock corrosion genetic type, the application number 201710234603.1 of type；A kind of carbon
The analysis method of Carbonate Rocks corrosion and corrosion effect, 201410717934.7).But existing device is mainly based upon
Under laboratory condition either in the single simulation experiment that carries out under low Temperature-pressure Conditions, the environment of experiment is unable to reach true stratum
Condition and corrosion mode can not select, experimental facilities can only be carried out for a kind of corrosion mode.And existing method is more
Be by experiment front and back image comparison qualitatively differentiate corrosion mineral, since the limitation of image selection causes more
Corrosion mineral can not identify, to affect final experiment conclusion.
Summary of the invention
In order to solve the above-mentioned technical problem, the purpose of the present invention is to provide one kind can be with the storage of real simulation reservoir conditions
The analogue experiment method and device of layer corrosion.
In order to realize above-mentioned technical problem, present invention firstly provides a kind of simulated experiment sides of high temperature and pressure reservoir corrosion
Method, the analogue experiment method the following steps are included:
Step 1: the rock forming mineral composition and constituent content of reservoir samples are determined；
Step 2: according to the characteristic of fluid undergone in reservoir geology evolutionary process, the reaction solution of corrosion is determined；
Wherein, the area of Weathering And Leaching corrosion occurs if it is near surface, reaction solution selects carbon acid solution；
It is contacted if it is deep with hydrocarbon source rock, by the area of Organic acids dissolution, reaction solution selects acetic acid solution；
The area of persulfate thermal chemical reaction occurs if it is sulfide hydrogen reservoir, reaction solution selects hydrogen sulfide molten
Liquid；
Step 3: the strata temperature and pressure undergone in evolutionary process is buried according to reservoir, determines the corrosion of simulated experiment
The temperature and pressure of reaction；
Step 4: according to the corrosion mode for burying reservoir in evolutionary process, the corrosion mode of simulated experiment is determined；
Step 5: carrying out corrosion simulated experiment, completes the corrosion to high temperature and pressure reservoir and simulates.
In analogue experiment method of the invention, it is preferable that the reservoir samples used is plunger sample or particulate samples.
Specific embodiment according to the present invention determines the rock forming mineral group of reservoir samples by X diffraction or other methods
At with Main elements content.
In analogue experiment method of the invention, reservoir samples are dried.If it is plunger sample, then sample is required
Specification is standard plunger piston sample, and diameter 2.5cm, length is 1.5-3 times of diameter, and plunger sample both ends polish, and end face and cylinder hang down
Directly, with the diameter and length of slide calliper rule accurate measurement rock sample, volume is calculated；It then needs to be measured with micro-scale volume if it is particulate samples
The measurement of instrument progress particle volume.
In analogue experiment method of the invention, it is preferable that in step 4, according to the property of water flooding in reservoir or
Water type included in the inclusion enclave of different times mineral formation determines the corrosion mode for burying reservoir in evolutionary process.
In analogue experiment method of the invention, it is preferable that in step 4, when water type is CaCl2Or MgCl2When type,
The corrosion mode that selection closing does not recycle；
When water type is NaHCO3When type, the corrosion mode of closed circulation is selected；
When water type is CaSO4When type, the open corrosion mode not recycled of selection.
Specific embodiment according to the present invention, by way of sample (plunger sample or particulate samples) and control back pressure into
The corrosion simulated experiment of the different corrosion modes of row.
In analogue experiment method of the invention, it is preferable that in step 3, pass through Petromod basin modelling software mould
The Evolutionary History of quasi-simple well reservoir determines that the reservoir buries the strata temperature and pressure undergone in evolutionary process.
In analogue experiment method of the invention, the Petromod basin modelling software of use is the simulation of this field routine
The software of reservoir individual well Evolutionary History is carried out according to the routine operation of this field.
In analogue experiment method of the invention, when carrying out corrosion simulated experiment, erosion time is according to the knot of reservoir corrosion
Method in the determination method and apparatus (application No. is 201810096178.9) of beam time is determined.
Analogue experiment method of the invention, the corrosion that can simulate a variety of rock types of deep layer are tested, including carbonate rock,
Clastic rock, volcanic rock and metamorphic rock；High temperature and pressure can not only be simulated, and (temperature is 0 DEG C -250 DEG C；Pressure is 0MPa-100MPa)
Formation condition, moreover it is possible to realize that the corrosion to plunger sample and particulate samples is tested, solving existing method cannot simulate truly
Layer condition and to rock sample type limit the problem of.Meanwhile analogue experiment method of the invention can be buried according to stratum
The type of flow of fluid selects corresponding dissolved corrosion test mode to simulate rock under the conditions of true stratum in stratum in evolutionary process
The environment (including closing not endless form, closed circulation mode, open not endless form) of corrosion, closer to true reservoir ring
Border.
The present invention also provides a kind of determination methods of the corrosion situation of high temperature and pressure reservoir, which includes following
Step:
Carry out the analogue experiment method of high temperature and pressure reservoir corrosion of the invention；
After experiment, data are acquired, pass through rock forming mineral composition or constituent content before and after comparison corrosion simulated experiment
Difference determines the mineral grain that corrosion occurs；By comparison corrosion simulated experiment before and after quality difference, the difference of volume,
Determine the pore volume that corrosion is formed.
The determination method of the corrosion situation of high temperature and pressure reservoir according to the present invention, can also be by right for plunger sample
Plunger sample carries out porosity determination, and the porosity after obtaining corrosion compares the porosity of the plunger sample before and after corrosion, obtains
The increment of pore volume after corrosion determines the pore volume that corrosion is formed.
The determination method of the corrosion situation of high temperature and pressure reservoir of the invention, specifically includes the following steps:
Carry out the analogue experiment method of high temperature and pressure reservoir corrosion of the invention；
After experiment, whole reaction solutions is recycled, and collects the solution after reaction, the reservoir samples after reaction are dried
It weighs again, compares the weight differential of front and back；Particulate samples can carry out the survey of total volume again by micro-scale volume analyzer
Fixed, plunger sample can measure porosity；The solution of collection is subjected to ion component and concentration analysis；
For example, comparing rock forming mineral composition and element before corrosion according to solion ingredient and concentration, which mineral being determined
Corrosion has occurred, and calculates weight percent shared by corrosion mineral using the variation of mineral chemistry formula and experiment front and back weight and contains
Amount.
The determination method of the corrosion situation of high temperature and pressure reservoir of the invention, judging result is accurate, with can pointing out deep layer
Can whether secondary pore develops under the conditions of matter, form the reservoir body of oil gas, and can rational judgment which kind of mineral have occurred it is molten
Erosion.
In order to can be with the reservoir corrosion under real simulation reservoir conditions, invention further provides a kind of high temperature and pressure reservoir is molten
The imitative experimental appliance of erosion, the imitative experimental appliance include:
Injection device, insulating box, confining pressure equipment, back pressure equipment, reclaimer；
Wherein, injection device is connect with insulating box；
Insulating box is connect with back pressure equipment, is provided with metering pump in the connecting pipeline of insulating box and back pressure equipment；
Core holding unit and particulate samples kettle are provided in insulating box；
Confining pressure equipment is used to control the confining pressure of core holding unit.
Specific embodiment according to the present invention, insulating box simulate true stratum temperature by setting different temperature
Degree.
In imitative experimental appliance of the invention, it is preferable that injection device includes fluid box and constant pressure constant speed pump.
In imitative experimental appliance of the invention, fluid box is used to load the reaction solution of simulated experiment, and (for example acetic acid is molten
Liquid, carbon acid solution, H2S solution)；Constant pressure constant speed pump be used for by the reaction liquid in fluid box be injected into core holding unit or
In grain sample kettle, and fluid is made to flow the ion for taking corrosion out of in core holding unit or particulate samples kettle, so as to analyze
The component of rock.
In imitative experimental appliance of the invention, it is preferable that fluid box is connect with constant pressure constant speed pump, constant pressure constant speed pump and rock
Heart clamp holder and particulate samples kettle are separately connected.Wherein, hand is provided in the connecting pipeline of constant pressure constant speed pump and core holding unit
Dynamic valve.
In imitative experimental appliance of the invention, when the open corrosion mode not recycled of selection and the corrosion not recycled is closed
When mode, corrosion experiment carries out in core holding unit；When selecting the corrosion mode of closed circulation, corrosion is tested in granular
It is carried out in product kettle.
In imitative experimental appliance of the invention, core holding unit can be used for placing plunger sample or particulate samples.When wanting
It needs that particle is first packed into core particle tank, the shape and size and standard plunger piston sample one of core particle tank when placing particulate samples
Cause, then again by particle it is canned enter core holding unit in.Particulate samples kettle can be used for placing particulate samples.
In imitative experimental appliance of the invention, it is preferable that particulate samples kettle is followed with settlement separator, internal circulation pump composition
Loop back path.
Wherein, particulate samples kettle is for placing particulate samples；Particulate samples kettle specification can be Φ 25mm × 100mm, resistance to
Pressure value is 100MPa, and 250 ° of maximum temperature, material is Hastelloy.
Internal circulation pump is used to promote the flowing of fluid in particulate samples kettle, the speed that can be flowed by rotational speed regulation liquid
Degree.The pump housing of internal circulation pump and the material of blade can be Hastelloy.
Settlement separator is for precipitating the minerals after corrosion.Settlement separator volume 200mL, pressure voltage 100MPa,
250 ° of maximum temperature, material can be Hastelloy.
In imitative experimental appliance of the invention, confining pressure equipment includes pneumatic operated valve and confining pressure tracking pump.Wherein, confining pressure tracks
Pump can simulate true ground environment, to rock load it is certain cover pressure, and this covers that press can be with injection pressure
Increase and increases.Confining pressure tracking pump can set a consistent difference, make confining pressure pump that can automatically adjust the pressure difference of rock core input end, protect
Card it is certain cover pressure.
In imitative experimental appliance of the invention, it is preferable that back pressure equipment includes back pressure controller, pressure surge tank, hand
Shake pump.Applying back pressure in the outlet end of core holding unit can control the flow regime of fluid in core holding unit, play closing
Or the effect of open system.Hand pump is used to apply manually the pressure of clamper outlet end；Pressure surge tank has to pressure
The adjustment effect of fluctuation plays the role of the precision of the protection and pressure control to equipment；Back pressure controller can separate reaction solution
With the liquid in hand pump, and the pressure change at both ends is monitored, plays the role of the entire back pressure device of control.
In imitative experimental appliance of the invention, it is preferable that back pressure controller is connect with metering pump.Wherein, metering pump can
With real-time online detection by the fluid flow of core holding unit, and then instantaneous permeability is calculated.
In imitative experimental appliance of the invention, it is preferable that set in the connecting pipeline of back pressure controller and pressure surge tank
It is equipped with reclaimer i.e. receiving flask.
Specific embodiment according to the present invention, reclaimer are used to collect the fluid after rock is reacted with injection liquid.
The imitative experimental appliance of high temperature and pressure reservoir corrosion of the invention, can simulate the corrosion of a variety of rock types of deep layer
Experiment, including carbonate rock, clastic rock, volcanic rock and metamorphic rock；High temperature and pressure can not only be simulated, and (temperature is 0 DEG C -250 DEG C；
Pressure is 0MPa-100MPa) formation condition, moreover it is possible to it realizes that the corrosion to plunger sample and particulate samples is tested, solves existing
Device cannot simulate true formation condition and the problem of to the limitation of rock sample type.Meanwhile simulated experiment of the invention
The type of flow that device can bury fluid in stratum in evolutionary process according to stratum selects corresponding dissolved corrosion test mode to carry out mould
Intend environment (including closed circulation mode, the closing not endless form, the open not side of circulation of rock corrosion under the conditions of true stratum
Formula), closer to true reservoir environment.
Simulated experiment side's device of high temperature and pressure reservoir corrosion of the invention can satisfy particulate samples and regular plunger sample
Experiment；Closing can be simulated by the combination of the particulate samples axe, core holding unit and back pressure equipment of Hastelloy simultaneously to follow
Ring, closing do not recycle, open reservoir corrosion mode under not cycling condition, more realistically reflect a variety of formation conditions.Metering
Pump can under on-line measurement high-temperature and high-pressure conditions fluid volume, the permeability value of plunger sample can be calculated in real time.
The analogue experiment method and device of high temperature and pressure reservoir corrosion of the invention, the environment being according to oil and gas reservoir or
The geological environment undergone in evolutionary process and reservoir corrosion mode are buried, the molten of different type rock under the conditions of true stratum is simulated
Erosion experiment.By the comparison that experiment front and back sample is microcosmic, the particle that corrosion occurs can be primarily determined；By rock component or
Rock essential element with react after solion component and concentration, clearly occur corrosion mineral grain；Utilize reaction front and back
The difference of quality, the difference of volume calculate the pore volume of corrosion formation, so that whether corrosion occurs under the conditions of predicting stratum
Effect, if form secondary pore volume.
The corrosion that analogue experiment method and device through the invention can simulate oil and gas reservoir under high-temperature and high-pressure conditions is special
Sign, judges its Dissolution Mechanism；It is that analogue experiment method and device through the invention obtains as a result, it is possible to instruct the oil gas of deep layer
Exploration deployment reduces exploration risk.
The analogue experiment method and device of the high temperature and pressure reservoir corrosion of invention are practical in terms of oil and gas reservoir research,
With wider application prospect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the imitative experimental appliance of the high temperature and pressure reservoir corrosion in the embodiment of the present invention.
Fig. 2 is that Tarim Basin Keping Region simulation well buries thermal evolution history figure in the embodiment of the present invention.
Main Reference symbol description:
1 fluid box, 2 constant pressure constant speed pump, 3 core holding unit, 4 particulate samples kettle, 5 high pressure internal circulation pump, 6 settlement separator
7 confining pressures tracking pump 8 back pressure controller, 9 pressure surge tank, 10 hand pump, 11 pneumatic operated valve, 12 hand-operated valve
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
In one embodiment of the invention, a kind of simulation of high temperature and pressure reservoir corrosion as shown in Figure 1 is provided
Experimental provision, the imitative experimental appliance may include:
Injection device, insulating box, confining pressure equipment, back pressure equipment, reclaimer；
Wherein, injection device is connect with insulating box；
Insulating box is connect with back pressure equipment, is provided with metering pump in the connecting pipeline of insulating box and back pressure equipment；
Core holding unit and particulate samples kettle are provided in insulating box；
Confining pressure equipment is used to control the confining pressure of core holding unit.
In one embodiment of the invention, insulating box simulates true stratum temperature by setting different temperature
Degree.
In one embodiment of the invention, injection device includes fluid box 1 and constant pressure constant speed pump 2.Wherein, fluid box
1 connect with constant pressure constant speed pump 2.Fluid box 1 be used for load simulated experiment reaction solution (such as acetic acid solution, carbon acid solution,
H2S solution).Constant pressure constant speed pump 2 is used to the reaction liquid in fluid box 1 being injected into core holding unit 3 or particulate samples kettle 4
In, and fluid is made to flow the ion for taking corrosion out of in core holding unit 3 or particulate samples kettle 4, so as to analyze rock
Component.
In one embodiment of the invention, constant pressure constant speed pump 2 connects respectively with core holding unit 3 and particulate samples kettle 4
It connects.Wherein, hand-operated valve 12 is provided in the connecting pipeline of constant pressure constant speed pump 2 and core holding unit 3.
In another embodiment of the present invention, particulate samples kettle 4 is recycled back to settlement separator 6, the composition of internal circulation pump 5
Road.Wherein, internal circulation pump 5 is used to promote the flowing of fluid in particulate samples kettle, the speed that can be flowed by rotational speed regulation liquid
Degree.The pump housing of internal circulation pump 5 and the material of blade can be Hastelloy.Settlement separator 6 is for precipitating the mineral after corrosion
Matter.Settlement separator volume 200mL, pressure voltage 100MPa, 250 ° of maximum temperature, material can be Hastelloy.
In another embodiment of the present invention, core holding unit 3 can be used for placing plunger sample or particulate samples.When wanting
It needs that particle is first packed into core particle tank, the shape and size and standard plunger piston sample one of core particle tank when placing particulate samples
Cause, then again by particle it is canned enter core holding unit in.Particulate samples kettle 4 can be used for placing particulate samples.Wherein, granular
Product kettle 4 is for placing particulate samples；Particulate samples kettle specification can be Φ 25mm × 100mm, pressure voltage 100MPa, the highest temperature
250 ° of degree, material is Hastelloy.
In one embodiment of the invention, confining pressure equipment includes pneumatic operated valve 11 and confining pressure tracking pump 7.Wherein, confining pressure
Tracking pump 7 can simulate true ground environment, certain pressure of covering be loaded to rock, and it is that can press with injecting that this, which covers pressure,
The increase of power and increase.Confining pressure tracking pump 7 can set a consistent difference, guarantee certain to cover pressure.
In another embodiment of the invention, back pressure equipment includes back pressure controller 8, pressure surge tank 9, hand pump 10.
Applying back pressure in the outlet end of core holding unit 3 can control the flow regime of fluid in core holding unit 3, play closing or
The effect of open system.Hand pump 10 is used to apply manually the pressure of clamper outlet end；Pressure surge tank 9 has to pressure wave
Dynamic adjustment effect plays the role of the precision of the protection and pressure control to equipment；Back pressure controller 8 can separate reaction solution and
Liquid in hand pump, and the pressure change at both ends is monitored, play the role of the entire back pressure device of control.
In another embodiment of the invention, back pressure controller 8 is connect with metering pump.Wherein, metering pump can exist in real time
Line detects the fluid flow by core holding unit, and then instantaneous permeability is calculated.Back pressure controller 8 and pressure surge tank
Reclaimer i.e. receiving flask is provided in 9 connecting pipeline.
Embodiment 1
In order to predict whether degree of prospecting very low Keping Region lower and middle cambrian in Tarim Basin develops oil and gas reservoir, and
Guidance is provided for the block bidding work of this area.A kind of analogue experiment method is present embodiments provided, is by shown in Fig. 1
Device complete, specifically includes the following steps:
The fresh sample that outcrop acquires is handled, the plunger sample of standard is fabricated to, diameter 2.474cm is long
Degree is 4.117cm, and plunger sample both ends polish, end face and column vertical.200 DEG C of samples weighings after drying 4 hours, weight is
55.045g.Surveying porosity is 10.97%, permeability 4.2mD.
X diffraction analysis is carried out to the sample, measures its component, component data are shown in Table 1
1 sample X diffraction analysis of table
| Component | Quartz | Potassium feldspar | Calcite | Dolomite |
| Mineral content (%) | 10.8 | 1.6 | 4.5 | 83.1 |
Keping Region footwall develops more complete structural trap, and trap geometry is complete, the system sealed for one, because
This selects corrosion mode not recycle for closing；Since trap does not destroy, select acetic acid solution as reaction solution.
According to area simulation well stratum burial evolution history (Fig. 2), temperature and pressure spot (table 2) in this experimentation are set.
Table 2
| Experimental sequence point | Geologic Time | Formation temperature (DEG C) | Pressure (Mpa) |
| 1 | ∈ | 32 | 14 |
| 2 | O1-2 | 130 | 55 |
| 3 | C | 70 | 28 |
| 4 | P | 125 | 45 |
| 5 | T | 160 | 65 |
| 6 | K+J | 140 | 65 |
| 7 | N+E | 120 | 80 |
Table 2 be Keping Region lower and middle cambrian stratum geology bury during different times undergo temperature and pressure and
Experimental sequence point.
Rock core is fitted into core holding unit, the inlet and outlet pipeline of core holding unit is connected.It is tracked by confining pressure
The confining pressure to core holding unit load 3Mpa or so is pumped, after a period of stabilisation, experiment is carried out in confirmation no liquid leakage again.
Ensure that each valve remains off before experiment.The temperature of insulating box is set as to the temperature of simulated experiment first
Spend (table 2), give confining pressure tracking pump setting one fixed pressure value (strata pressure in table 2), to constant temperature the temperature inside the box stablize with
And after the confined pressure steady of confining pressure tracking pump, the dilute hydrochloric acid solution of 5L is injected into fluid box, opens core holding unit input end
Hand-operated valve opens constant pressure constant speed pump, dilute hydrochloric acid solution is injected into core holding unit.
Corrosion experiment time according to reservoir corrosion end time determination method and apparatus (application No. is
201810096178.9) in method be determined.After all temperature and pressure point experiments all during recovery acid-karst erosion all
Reaction solution, read total liquid volume number, and solution 10mL is taken to carry out ion component and concentration analysis, analysis the results are shown in Table 3.
The quality of the corrosion of 3 effects of ion component of table and quality and each mineral
After experiment, sample is dried, is weighed again, weight 48.39g.Porosity after corrosion is 12.83%,
Permeability after corrosion is 10.2%.It can be found that carbonate samples quality alleviates 12.09%, porosity is increased
16.96%, permeability value improves 1.42 times.
The corrosion quality of each mineral is calculated using the molecular formula and Molecular weights of mineral, calculated result shows white in the sample
Cloud karst erosion rate is 11.827%, and calcite corrosion rate is 6.015%.Experimental result is as shown in table 4, be shown in it is buried under the conditions of
Dolomite can occur corrosion and form effective reservoir.
Each parameter comparison in the experiment of table 4 front and back
| Before experiment | After experiment | Increase and decrease amount | Change percentage (%) | |
| Quality (g) | 55.045 | 48.39 | 6.655 | 12.09 |
| Porosity (%) | 10.97 | 12.83 | 1.86 | 16.96 |
| Permeability (mD) | 4.2 | 10.2 | 6 | 142.86 |
In summary Experiment Result and analysis result, the variation (table 4) of each parameter in comparative experiments front and back, can obtain
It is buried in evolutionary process in geology out, Keping Region footwall is with saving in complete structural trap lower and middle cambrian dolomite
Layer is capable of forming effective secondary pore, and the corrosion of reservoir can occur under the formation condition of Keping Region deep layer, and
And the corrosion under this formation condition can result in the improvement of reservoir quality, can develop good hydrocarbon pore volume.Therefore,
It can speculate that there are the reservoirs of oil gas in the field, the field is explored from now in the case that other oil-gas geology elements meet
Beneficial direction.
Claims (10)
1. a kind of analogue experiment method of high temperature and pressure reservoir corrosion, which is characterized in that the analogue experiment method includes following step
It is rapid:
Step 1: the rock forming mineral composition and constituent content of reservoir samples are determined；
Step 2: according to the characteristic of fluid undergone in reservoir geology evolutionary process, the reaction solution of corrosion is determined；
Wherein, the area of Weathering And Leaching corrosion occurs if it is near surface, reaction solution selects carbon acid solution；
It is contacted if it is deep with hydrocarbon source rock, by the area of Organic acids dissolution, reaction solution selects acetic acid solution；
The area of persulfate thermal chemical reaction occurs if it is sulfide hydrogen reservoir, reaction solution selects hydrogen sulfide solution；
Step 3: the strata temperature and pressure undergone in evolutionary process is buried according to reservoir, determines the corrosion reaction of simulated experiment
Temperature and pressure；
Step 4: according to the corrosion mode for burying reservoir in evolutionary process, the corrosion mode of simulated experiment is determined；
Step 5: carrying out corrosion simulated experiment, completes the corrosion to high temperature and pressure reservoir and simulates.
2. analogue experiment method according to claim 1, which is characterized in that the reservoir samples used is plunger sample or particles
Sample.
3. analogue experiment method according to claim 1, which is characterized in that in the step 4, according in reservoir
Reservoir in evolutionary process is buried in water type determination included in the property of layer water or the inclusion enclave of different times mineral formation
Corrosion mode.
4. analogue experiment method according to claim 3, which is characterized in that in the step 4, when water type is CaCl2
Or MgCl2The corrosion mode that selection closing does not recycle when type；
When water type is NaHCO3The corrosion mode of closed circulation is selected when type；
When water type is CaSO4The open corrosion mode not recycled is selected when type.
5. analogue experiment method according to claim 1, which is characterized in that in the step 3, pass through Petromod
Basin modelling software simulates the Evolutionary History of individual well reservoir, determines that the reservoir buries the formation temperature undergone in evolutionary process and pressure
Power.
6. a kind of determination method of the corrosion situation of high temperature and pressure reservoir, which is characterized in that the determination method the following steps are included:
Carry out the described in any item analogue experiment methods of claim 1-5；
After experiment, data are acquired, by comparing the difference of corrosion simulated experiment front and back rock forming mineral composition or constituent content,
Determine the mineral grain that corrosion occurs；By difference, the difference of volume of the quality before and after comparison corrosion simulated experiment, determine molten
Lose the pore volume formed.
7. a kind of imitative experimental appliance of high temperature and pressure reservoir corrosion, which is characterized in that the imitative experimental appliance includes:
Injection device, insulating box, confining pressure equipment, back pressure equipment, reclaimer；
Wherein, the injection device is connect with the insulating box；
The insulating box is connect with back pressure equipment, is provided with metering in the connecting pipeline of the insulating box and the back pressure equipment
Pump；
Core holding unit and particulate samples kettle are provided in the insulating box；
The confining pressure equipment is used to control the confining pressure of core holding unit.
8. imitative experimental appliance according to claim 7, which is characterized in that the injection device includes fluid box and constant pressure
Constant speed pump；Preferably, the fluid box is connect with the constant pressure constant speed pump, the constant pressure constant speed pump and the core holding unit and
Particulate samples kettle is separately connected.
9. imitative experimental appliance according to claim 7, which is characterized in that the particulate samples kettle and settlement separator,
Internal circulation pump constitutes circulation loop.
10. imitative experimental appliance according to claim 7, which is characterized in that the back pressure equipment include back pressure controller,
Pressure surge tank, hand pump；Preferably, the back pressure controller is connect with the metering pump；The back pressure controller with it is described
Reclaimer is provided in the connecting pipeline of pressure surge tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810598722.XA CN108956435B (en) | 2018-06-12 | 2018-06-12 | Simulation experiment method and device for high-temperature high-pressure reservoir corrosion |
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