CN109357921A - A kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable - Google Patents
A kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable Download PDFInfo
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- CN109357921A CN109357921A CN201811175904.2A CN201811175904A CN109357921A CN 109357921 A CN109357921 A CN 109357921A CN 201811175904 A CN201811175904 A CN 201811175904A CN 109357921 A CN109357921 A CN 109357921A
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Abstract
A kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable, specifically includes: by paraffin carve or be heated to plastic state, the solution cavity model and fractured model of certain shapes is made, and connect end heating after link together after be placed on rock core mold center；Cement mortar is poured into the gap between rock core mold and fracture hole model；It consolidates to form rock core matrix to cement mortar, by artificial core grinding two end surfaces；Rock core is placed in baking oven or core holding unit, makes paraffin melting for that liquid and can flow out by crack, then progress nitrogen, kerosene alternating displacement to be higher than under paraffin melting point, until paraffin is completely exhausted out in fracture hole, completion Artificial Core Making.Corestone manufacture method of the present invention is simple, crack and solution cavity shape, connected relation are controllable, fracture hole wall roughness and wetability are closer to true reservoir, fracture hole wall surface wetability is in slightly oil-wet state after Treating Cuttings with Paraffin Wax, rock core is able to bear high pressure, carries out high temperature and pressure experiment suitable for being put into core holding unit.
Description
Technical field
The invention belongs to oil gas experimental technique fields, are related to a kind of production of fracture hole oil reservoir artificial core, especially a kind of
Fracture hole parameter is controllable, the fracture hole oil reservoir Artificial Core Making method suitable for high temperature and pressure displacement test.
Background technique
It is real that fracture-pore reservoir carries out indoor simulation as conventional oil reservoir development, using representative reservoir core
It tests, is to obtain oil reservoir key parameter, understanding oil reservoir development rule, and then formulate the essential link of scientific development scheme.It splits
Seam and solution cavity are the main memory space of fracture hole oil reservoir and seepage channel, because of such oil reservoir fracture hole size, shape, connected relation
Etc. sufficiently complex, reservoir properties non-homogeneous degree is very high, leads to either underground coring or outcrop coring, is all difficult
Obtain representative reservoir core.Therefore it needs to represent fracture cave reservoir with artificial core, carries out corresponding laboratory experiment.Mesh
Forefathers' seam hole rock core there are two main classes method: first is that performing etching production visualization fracture hole model using organic glass, but should
Class fracture hole model cannot bear high pressure, cannot be tested under strata pressure；Second is that being passed through using true carbonate rock rock core
Rock core rive in internal production fracture hole, is then adhesively-bonded together to form simulation core.Both the above method is hard due to material used
Spend it is larger, it is relatively difficult to the state modulators such as solution cavity and fracture shape, mode of communicating, typically with approximate pipe passageway come generation
There is very big difference in table crack with practical fracture pattern, in addition, the fracture hole wall surface smoother of above method production, rock core profit
Moist generally strong water-wet, this with hydraulically rough surface and partially oily wet actual reservoir there are larger gaps.
Summary of the invention
The purpose of the present invention is to provide a kind of production simply, and the shape of fracture hole, mode of communicating are controllable, and fracture hole wall surface is thick
Rough, wetability is closer to true core, the production method of the fracture hole oil reservoir artificial core suitable for high temperature and pressure experiment.It solves
Current fracture hole shape, mode of communicating control are difficult, and wall surface property and actual reservoir difference are big, part artificial core cannot be born
The drawbacks of high pressure.
In order to solve the above-mentioned technical problem, the present invention is accomplished by the following way:
A kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable, specifically includes the following steps:
1) paraffin is carved or is heated to Plastic Forming state, the solution cavity model and fractured model of certain shapes is made, and
It will link together after the heating of the connecting pin of solution cavity model and fractured model according to required；
2) paraffin in step 1) is shaped to and is connected with solution cavity model and fractured model is placed on rock core mold center；
3) cement mortar is configured, cement mortar is poured and is filled between rock core mold and fractured model, solution cavity model
Among gap；
4) it is stored at room temperature and consolidates within 48 hours to form rock core matrix to cement mortar, and by artificial core grinding two end surfaces；
5) rock core of step 4) is placed in an oven or is placed in the core holding unit that can be heated, to melt higher than paraffin
Make paraffin melting to be that liquid can simultaneously be flowed out by crack at a temperature of point, nitrogen, kerosene alternating displacement is then carried out, until crack
It is completely exhausted out with the paraffin melted in solution cavity, completes Artificial Core Making.
Further, a certain size In Carbonate Rock can be mixed into the step 1) when production solution cavity model in paraffin
Block etc. fills substance, and substance is filled after paraffin melting discharge and is trapped in solution cavity model, realizes half filling state of solution cavity.
Further, the fractured model in the step 1) can be replaced using certain thickness plastic plate, to cement bonded sand
The rock core matrix that slurry pours extracts plastic plate out when not yet fully consolidated, to achieve the purpose that accurate control critical eigenvalue width.
Further, in the cement mortar in the step 3), the mass ratio of preferred cement, sand and water is 1:3:0.6,
It is required that having stronger hardness after cement mortar consolidation, the artificial core being eventually fabricated can support core holding unit high confining pressure to make
With.
Compared with prior art, the invention has the benefit that
Artificial core production method of the present invention is simple, and crack and solution cavity shape, connected relation are controllable, fracture hole wall roughness
With wetability closer to true reservoir, fracture hole wall surface wetability is in slightly oil-wet state after Treating Cuttings with Paraffin Wax, with most of fracture hole
Reservoir wettability state is close；Rock core matrix is that cement mortar consolidates simultaneously, and rock core is able to bear high pressure, suitable for being put into
Core holding unit carries out high temperature and pressure experiment.
Detailed description of the invention
Fig. 1 is the fracture hole rock core overlooking structure diagram of the embodiment of the present invention；
Fig. 2 is the fracture hole rock core schematic view of the front view of the embodiment of the present invention；
Each label is respectively as follows: 1, rock core mold, 2, rock core matrix, 3, fractured model, 4, solution cavity model in figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.
A kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable, specifically includes the following steps:
1) paraffin is carved or is heated to Plastic Forming state, the solution cavity model and fractured model of certain shapes is made, and
It will link together after the heating of the connecting pin of solution cavity model and fractured model according to required；
2) paraffin in step 1) is shaped to and is connected with solution cavity model and fractured model is placed on rock core mold center；
3) cement mortar is configured, cement mortar is poured and is filled between rock core mold and fractured model, solution cavity model
Among gap；
4) it is stored at room temperature and consolidates within 48 hours to form rock core matrix to cement mortar, and by artificial core grinding two end surfaces；
5) rock core of step 4) is placed in an oven or is placed in the core holding unit that can be heated, to melt higher than paraffin
Make paraffin melting to be that liquid can simultaneously be flowed out by crack at a temperature of point, nitrogen, kerosene alternating displacement is then carried out, until crack
It is completely exhausted out with the paraffin melted in solution cavity, completes Artificial Core Making.
Further, filling substance can be mixed into paraffin in the solution cavity model that step 1) makes of paraffin, it is such as certain
The carbonate rock stone of size, filling substance after paraffin melting discharge can be trapped in solution cavity, realize half filling shape of solution cavity
State.
Further, fractured model can be replaced with certain thickness plastic plate, and the rock core matrix poured to cement is not yet
Plastic plate can be extracted when fully consolidated out, to achieve the purpose that accurate control critical eigenvalue width.
Further, cement mortar is mixed using a certain proportion of cement, gravel and water, it is desirable that cement mortar consolidation
There is stronger hardness afterwards, the artificial core being eventually fabricated can support core holding unit high confining pressure to act on.
As shown in Fig. 1~2, a kind of artificial core of the fracture hole oil reservoir Artificial Core Making method that parameter is controllable production, packet
Include: rock core mold 1, rock core matrix 2, fractured model 3 and solution cavity model 4, wherein rock core mold 1 is the blank pipe of plastic material, rock
Depending on the length and diameter of heart mold makes the size of rock core as needed, rock core matrix 2 is poured for cement mortar and is consolidated
And be filled in rock core mold, fractured model 3 is all made of paraffin material with solution cavity model 4 and is made.
Fracture hole body wall face made by the method for the present invention is coarse, and after tested, fracture hole wall surface wetability is in weak after Treating Cuttings with Paraffin Wax
Oleophylic state, it is close with most of fracture hole reservoir wettability state.
The above is only embodiments of the present invention, is stated again, and those skilled in the art are come
It says, without departing from the principle of the present invention, several improvement can also be carried out to the present invention, these improvement are also included in the present invention
In scope of protection of the claims.
Claims (4)
1. a kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable, it is characterised in that: specifically includes the following steps:
1) paraffin is carved or is heated to Plastic Forming state, the solution cavity model and fractured model of certain shapes is made, and will be molten
It links together after the heating of the connecting pin of hole model and fractured model according to required；
2) paraffin in step 1) is shaped to and is connected with solution cavity model and fractured model is placed on rock core mold center；
3) cement mortar is configured, cement mortar is poured to the gap being filled between rock core mold and fractured model, solution cavity model
Among；
4) it is stored at room temperature and consolidates within 48 hours to form rock core matrix to cement mortar, and by artificial core grinding two end surfaces；
5) rock core of step 4) is placed in an oven or is placed in the core holding unit that can be heated, to be higher than paraffin melting point temperature
Degree is lower so that paraffin melting can flow out for liquid and by crack, then progress nitrogen, kerosene alternating displacement, until crack and molten
The paraffin melted in hole is completely exhausted out, and completes Artificial Core Making.
2. a kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable as described in claim 1, it is characterised in that: described
It can be mixed into filling substance in paraffin when production solution cavity model in step 1), filling substance is trapped in molten after paraffin melting discharge
In the model of hole, half filling state of solution cavity is realized.
3. a kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable as described in claim 1, it is characterised in that: described
Fractured model in step 1) can be replaced using certain thickness plastic plate, and the rock core matrix poured to cement mortar is not yet complete
Plastic plate is extracted out when full consolidation, to achieve the purpose that accurate control critical eigenvalue width.
4. a kind of fracture hole oil reservoir Artificial Core Making method that parameter is controllable as described in claim 1, it is characterised in that: described
Cement mortar in step 3) uses mass ratio to be mixed for the cement of 1:3:0.6, sand and water, it is desirable that after cement mortar consolidation
With stronger hardness, manufactured artificial core can support core holding unit high confining pressure to act on.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987557A (en) * | 2019-11-20 | 2020-04-10 | 四川大学 | Method for manufacturing rock-like body built-in open type fracture sample based on polyhydroxyalkanoate |
| CN111060366A (en) * | 2019-12-13 | 2020-04-24 | 中国海洋石油集团有限公司 | Artificial core manufacturing method for simulating borehole drilling |
| CN112146960A (en) * | 2020-10-14 | 2020-12-29 | 中国矿业大学(北京) | Method for manufacturing cement mortar test piece with built-in open crack |
| CN113049321A (en) * | 2019-12-26 | 2021-06-29 | 中国石油天然气股份有限公司 | Preparation method of reservoir model and reservoir model |
| CN113484116A (en) * | 2021-07-16 | 2021-10-08 | 中国石油大学(华东) | Method for nondestructively preparing artificial core with fracture-cavity/fracture structure and artificial core |
| CN113702147A (en) * | 2020-05-20 | 2021-11-26 | 中国石油天然气股份有限公司 | Core manufacturing method |
| CN113916627A (en) * | 2021-09-30 | 2022-01-11 | 中南大学 | Device and method for preparing simulated rock sample containing complex-form weak layer |
| CN116297618A (en) * | 2023-03-14 | 2023-06-23 | 西南石油大学 | Nuclear magnetic online monitoring experimental method for saturation of saturated living oil shale |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987557A (en) * | 2019-11-20 | 2020-04-10 | 四川大学 | Method for manufacturing rock-like body built-in open type fracture sample based on polyhydroxyalkanoate |
| CN111060366A (en) * | 2019-12-13 | 2020-04-24 | 中国海洋石油集团有限公司 | Artificial core manufacturing method for simulating borehole drilling |
| CN113049321A (en) * | 2019-12-26 | 2021-06-29 | 中国石油天然气股份有限公司 | Preparation method of reservoir model and reservoir model |
| CN113049321B (en) * | 2019-12-26 | 2023-01-10 | 中国石油天然气股份有限公司 | Preparation method of reservoir model and reservoir model |
| CN113702147A (en) * | 2020-05-20 | 2021-11-26 | 中国石油天然气股份有限公司 | Core manufacturing method |
| CN112146960A (en) * | 2020-10-14 | 2020-12-29 | 中国矿业大学(北京) | Method for manufacturing cement mortar test piece with built-in open crack |
| CN113484116A (en) * | 2021-07-16 | 2021-10-08 | 中国石油大学(华东) | Method for nondestructively preparing artificial core with fracture-cavity/fracture structure and artificial core |
| CN113484116B (en) * | 2021-07-16 | 2023-07-14 | 中国石油大学(华东) | Method for preparing artificial rock core with fracture-cavity/fracture structure in nondestructive mode and artificial rock core |
| CN113916627A (en) * | 2021-09-30 | 2022-01-11 | 中南大学 | Device and method for preparing simulated rock sample containing complex-form weak layer |
| CN116297618A (en) * | 2023-03-14 | 2023-06-23 | 西南石油大学 | Nuclear magnetic online monitoring experimental method for saturation of saturated living oil shale |
| CN116297618B (en) * | 2023-03-14 | 2023-11-14 | 西南石油大学 | Nuclear magnetic online monitoring experimental method for saturation of saturated living oil shale |
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