CN106442064A - Casting method of epoxy resin covered rock core - Google Patents
Casting method of epoxy resin covered rock core Download PDFInfo
- Publication number
- CN106442064A CN106442064A CN201610969279.3A CN201610969279A CN106442064A CN 106442064 A CN106442064 A CN 106442064A CN 201610969279 A CN201610969279 A CN 201610969279A CN 106442064 A CN106442064 A CN 106442064A
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- epoxy resin
- rock core
- casting
- casting method
- dbp
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention discloses a casting method of an epoxy resin covered rock core. The casting method comprises the following steps: determining a casting material type, wherein materials include an adhesive, a curing agent and a toughening agent; the adhesive is epoxy resin, the curing agent is polyamide resin and the toughening agent is dibutyl phthalate; mixing the adhesive, the curing agent and the toughening agent; uniformly and slowly injecting the mixed materials into a mold with the clamped rock core under the condition that the mold is horizontally arranged, and casting; finally, standing and cooling for 24h; detaching the mold and removing a casting finished product; and carrying out edge and corner polishing and beautifying. According to the casting method of the epoxy resin covered rock core, a manual rock core is subjected to external sealing and casting through the epoxy resin and has a good pressure bearing capability and stable rock core properties; and an application range of the rock cores is widened and displacement pressure is expanded to the use upper limit of 6MPa from the use upper limit of 1.0MPa, so that a foundation is laid for researches of indoor displacement experiments.
Description
Technical field
The present invention relates to oil field development technical field, especially a kind of epoxy resin wrap up the casting method of rock core.
Background technology
The production development in oil field, a rational development plan/production system is to maintain the basis of efficient production development, whole
Body scheme mainly passes through numerical simulation analysis, and the infrastest parameter of wherein laboratory experiment is the basis of digital-to-analogue.Therefore, objectively
The accuracy of laboratory experiment data is said, the regular influence of research the production development simulation of whole oil reservoir.
With regard to core model, two types, core holding unit and epoxy resin casting is now broadly divided at present.Existing current state
The Nei Ge research institution overwhelming majority is that the irony core holding unit more complicated with structure is clamped to rock core and sealed, main
Clamper model is wanted to include：These three major type of rock cores of φ 38 × 100mm of 25.4 × 100mm, φ, 45 × 45 × 300mm
Clamper.With the diversified development of core experiment displacement, increasing research needs to carry out using the rock core of large-size
Physical simulation experiment, such as 38 × 1000mm of φ 25.4 × 1000mm, φ, 45 × 45 × 300mm become the physical modeling of research
Model, but such dimension model is operated using clamper, there is following problem：1. volume is larger, thick and heavy, is not easy to remove
Fortune handling；2. pressurization (round outside but spuare inside) rubber sleeve sealing is relied on, easily rubber sleeve is damaged, leakage, confined pressure in experimentation, easily occur
Unstable etc. cause the failure of an experiment；3. the flowing space of whole mould conducting fluid is larger, studies in saturated oils, water drive oil etc.
Cheng Zhonghui produces the data of non-rock core seepage flow, affects experimental result；4. as mould is excessive, can not during measure rock pore volume
Using vacuum pumping method, cause its error relatively large.
The artificial core of epoxy resin casting, is increasingly favored by researcher.But, for the rock core of casting
For, the impact of the quality to rock core displacement effect of rock core effect of casting is very tight.Casting people's lithogenesis the most frequently used on the market
The heart, topmost problem is exactly that anti-pressure ability is not all right, and its ultimate pressure capacity ability is in 0.8-1.0MPa, and this has also limited to the people of casting
Group (a kind of device of raising epoxy resin casting rock core voltage endurance capability, publication number are entered in the extensive application of the lithogenesis heart, wherein Liu：
CN203572825U in its patent) specially design clip-model improve the voltage endurance capability of casting core model, so as to complete
Related experiment is designed；For the higher displacement test of displacement pressure, all core model can not be poured using epoxy resin.
Secondly it is exactly that artificial core is generally also formed with epoxy resin+quartz sand+clay mineral sintering, casting is also to use
Epoxy resin, Li Yiqiang just have in the invention of 05 year and show (quartz sand epoxide-resin agglutinated and preparation method thereof, open
Number：CN 1664547A), which results in the epoxy resin of casting and the epoxy resin of sintering rock core produces general character shadow between the two
Ring.If the epoxy resin of casting is too high using temperature, the mobility of casting cycle is too strong, can all cause one layer of core outside surface
Reaction is produced with the epoxy resin of casting, so as to change rock core property, finally affect experiment effect.
Therefore, the artificial core for casting needs to overcome the problem of these two aspects, could effectively ensure that rock core possesses
Certain voltage endurance capability, and relative influence is not produced to rock core.
Content of the invention
It is an object of the invention to provide a kind of epoxy resin wraps up the casting method of rock core, with the rock core folder for using at present
Holder is compared clamping core model/casting model, and good with voltage endurance capability, mode is relatively simple, rock core stable performance.Portable
Band or mobile, reusable, and it is good to test effect of visualization.
The technical scheme is that and be achieved in that：A kind of epoxy resin wraps up the casting method of rock core, including following
Step：
A, determination cast dose type, dispensing includes adhesive, firming agent, toughener, and wherein adhesive is epoxy resin,
Firming agent is polyamide, and toughener is dibutyl phthalate (DBP)；
B, above-mentioned adhesive, firming agent, toughener are mixed；
C, by the dispensing after mixing, it is ensured that in the case of die horizontal, uniformly slowly injection is clamped with the mould of rock core
Cast, finally standing cooling 24 hours；
D, mold is unloaded, abjection casting finished product, carry out corner angle polishing beautification.
It is further, the step B epoxy resin, polyamide, the weight proportion of dibutyl phthalate (DBP)
Ratio is 1：0.55：0.12.
It is further, the epoxy resin in step B, polyamide, the mixing step of dibutyl phthalate (DBP)
Suddenly it is：
A, proportionally weigh epoxy resin, polyamide, dibutyl phthalate (DBP) respectively；
B, the epoxy resin for weighing is heated, temperature control is at 40～60 DEG C, and heats while stirring；
C, when epoxy resin heating be changed into clear water shape when, add dibutyl phthalate (DBP) stir；
D, individually heating polyamide are until melt completely, temperature control is at 40～60 DEG C；
E, the hot polymerization amide resin after melting completely is added to the epoxy resin and phthalic acid two that obtain in step c
In fourth fat mixed solution, stir while adding, and be gradually lowered temperature.
It is further that the temperature of step b and d is 55 DEG C.
It is further that in step e, temperature is reduced to 40～45 DEG C.
It is further, in the casting cycle of step C, foaming is constantly driven out of using Glass rod.
The present invention compared with prior art, with following remarkable result：The present invention passes through with epoxy resin to artificial rock core
Outer sealing casting is carried out, good with bearing capacity, rock core is stable in properties, the range of such rock core has been widened, by displacement pressure
Power expands 6MPa SC service ceiling to from 1.0MPa SC service ceiling, is that the research of indoor displacement test provides the foundation.
Figure of description
Fig. 1 builds the pressure for embodiment rock core and destroys pressure-bearing figure；
Fig. 2 builds the pressure for second measurement rock core of embodiment and destroys pressure-bearing figure；
Fig. 3 builds the pressure for embodiment third time measurement rock core and destroys pressure-bearing figure.
Specific embodiment
A kind of casting method of epoxy resin parcel rock core of the present invention, comprises the following steps：
A, determination cast dose type, dispensing includes adhesive, firming agent, toughener, and wherein adhesive is epoxy resin,
Firming agent is polyamide, and toughener is dibutyl phthalate (DBP)；
B, above-mentioned adhesive, firming agent, toughener are mixed；
C, by the dispensing after mixing, it is ensured that in the case of die horizontal, uniformly slowly injection is clamped with the mould of rock core
Cast, finally standing cooling 24 hours；
D, mold is unloaded, abjection casting finished product, carry out corner angle polishing beautification.The sharp oarsman in edges and corners is avoided, causes safety
Accident.
The epoxy resin content 50%-100% of above-mentioned epoxy resin, epoxide equivalent 213-244, epoxide number 0.44-
0.47；220 ± the 20MgkoH/g of amine number of polyamide, molecular weight 600-1100, active hydrogen equivalent weight 195g/Eq, 40 DEG C of viscosity
Lower 1800cps；Molecular formula C of dibutyl phthalate (DBP)16H22O4, molecular weight 278.34.
It is the step B epoxy resin, polyamide, dibutyl phthalate (DBP) as the embodiment for optimizing
Weight proportion ratio is 1：0.55：0.12.Can so there are convenient intensity and toughness.
Epoxy resin, polyamide, the blend step of dibutyl phthalate (DBP) in step B is：
A, proportionally weigh epoxy resin, polyamide, dibutyl phthalate (DBP) respectively；
B, the epoxy resin for weighing is heated, temperature control is at 40～60 DEG C, and heats while stirring；
C, when epoxy resin heating be changed into clear water shape when, add dibutyl phthalate (DBP) stir；
D, individually heating polyamide are until melt completely, temperature control is at 40～60 DEG C；
E, the hot polymerization amide resin after melting completely is added to the epoxy resin and phthalic acid two that obtain in step c
In fourth fat mixed solution, stir while adding, and be gradually lowered temperature.
Wherein temperature preferably, the temperature of step b and d is 55 DEG C.
In step e, temperature is reduced to 40～45 DEG C.Its purpose is to reduce solution mobility, and accelerate solidification,
Reduce solution fluid and invade rock core, it is to avoid cause impact of the temperature to rock core epoxy resin.
It is preferred embodiment, in the casting cycle of step C, foaming is constantly driven out of using Glass rod.Because of liquid of casting
There is bubble in body, bubble existence position can be made to produce stress thrust area, reduce compressive resistance；So being slowly injected into and using glass
Rod is driven, and can effectively prevent bubble formation.
Embodiment
The rock core of 45 × 45 × 300mm size has been selected in interior, carries out the casting experiment of epoxy resin, and manufacture method includes
Following steps：
(1) basic parameter of naked rock core is determined：
1. rock core dry weight M is weighed1；
2., after evacuation saturation distilled water, dry weight M is weighed2, it is 33% to calculate core porosity；
3. core holding unit is put into, and it is 2100mD that water surveys permeability；
4. calorstat dries rock core
(2) mould assembling：
Mould is made up of base plate, upper frame, screw rod and fairing cap, and base plate and upper frame are ferro-aluminum, and screw rod is carbon steel,
Fairing cap is.There is pore eyelet at two on floor, on framework, respectively there is the big eyelet of screw rod at two ends, there is bolt framework bottom
Framework is linked together with base plate.After matched moulds, upper screw rod, to mould inside and the uniform coating silicon oil of screw rod, upper spiral
Bar.By in screw rod front end on fairing cap, and steadily artificial core to be clamped is placed, make rock core just be suspended from mould inside.
(3) determination of material and proportioning：
Adhesive epoxy resin, firming agent polyamide, toughener dibutyl phthalate (DBP) is needed, is calculated by weight
The ratio 1 of three:0.55:0.12；
(4) dispensing prepares：
1. the adhesive epoxy resin for weighing up first be heated to such as the clear water shape that can flow, temperature control is at 55 DEG C, and side is heated
Side is stirred；
2., when adhesive epoxy resin such as clear water shape, stir when toughener dibutyl phthalate (DBP) is added, it is ensured that
Stir；
3. simultaneously, agent polyamide is individually heating and curing until being completely melt, temperature control is at 55 DEG C；
4. firming agent polyamide is poured into the mixing of adhesive epoxy resin and toughener dibutyl phthalate (DBP)
In liquid, (stirring) is stirred while adding；Temperature is gradually lowered, temperature control is at 45 DEG C or so.
(5) injection molding：
By the dispensing after mixing, it is ensured that in the case of die horizontal, uniformly slowly inject and enter in the mould for be clamped with rock core
Row casting, and the bubble in fluid is driven, mould is filled, empties bubble.
(6) standing cooling, the demoulding is polished：
After the completion of casting, after standing cooling 24 as a child, dismounting mould carries out delivery, deviates from casting finished product, carries out simple
Polishing.
(7) permeability and the porosity of casting rock core are determined
1. rock core dry weight m is weighed1；
2., after evacuation saturation distilled water, dry weight m is weighed2, it is 32.9% to calculate core porosity；
3. connecting pipeline, it is 2052mD that water surveys permeability；
(8) build the pressure test：
Connection snap joint, blocks finished product one end, pressurizes in the other end, carries out the test that builds the pressure, and gradually pressurization is until rupture.
The compressive resistance of rock core casting finished product is tested out, experimental result is shown in accompanying drawing 1.Identical method, multigroup experimental data are subsequently adopted
Verify its voltage endurance capability, such as accompanying drawing 2, Fig. 3.
Analyzed by embodiment, impact of the casting method to rock core nature is less, epoxy resin invades rock core
Amount is very rare, can keep stable rock core Basic Physical Properties；And there is preferably voltage endurance capability, widened making for casting rock core
Use scope.
Presently preferred embodiments of the present invention is the foregoing is only, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement that is made etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of epoxy resin wraps up the casting method of rock core, it is characterised in that comprise the following steps：
A, determination cast dose type, dispensing includes adhesive, firming agent, toughener, and wherein adhesive is epoxy resin, to solidify
Agent is polyamide, and toughener is dibutyl phthalate (DBP)；
B, above-mentioned adhesive, firming agent, toughener are mixed；
C, by the dispensing after mixing, it is ensured that in the case of die horizontal, uniformly slowly injection is clamped with the mould of rock core and carries out
Casting, finally standing cooling 24 hours；
D, mold is unloaded, abjection casting finished product, carry out corner angle polishing beautification.
2. a kind of epoxy resin according to claim 1 wraps up the casting method of rock core, it is characterised in that step B
Epoxy resin, polyamide, the weight proportion ratio of dibutyl phthalate (DBP) are 1：0.55：0.12.
3. a kind of epoxy resin according to claim 2 wraps up the casting method of rock core, it is characterised in that step B
In epoxy resin, polyamide, the blend step of dibutyl phthalate (DBP) be：
A, proportionally weigh epoxy resin, polyamide, dibutyl phthalate (DBP) respectively；
B, the epoxy resin for weighing is heated, temperature control is at 40～60 DEG C, and heats while stirring；
C, when epoxy resin heating be changed into clear water shape when, add dibutyl phthalate (DBP) stir；
D, individually heating polyamide are until melt completely, temperature control is at 40～60 DEG C；
E, the hot polymerization amide resin after melting completely is added to the epoxy resin and dibutyl phthalate (DBP) that obtain in step c
In mixed solution, stir while adding, and be gradually lowered temperature.
4. a kind of epoxy resin according to claim 3 wraps up the casting method of rock core, it is characterised in that step b
55 DEG C are with the temperature of d.
5. a kind of epoxy resin according to claim 3 wraps up the casting method of rock core, it is characterised in that step e
Middle temperature is reduced to 40～45 DEG C.
6. a kind of epoxy resin according to claim 3 wraps up the casting method of rock core, it is characterised in that step C
Casting cycle in foaming is constantly driven out of using Glass rod.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898222A (en) * | 2017-04-14 | 2017-06-27 | 国土资源实物地质资料中心 | A kind of permanent store method of friable core |
| CN107476639A (en) * | 2017-09-22 | 2017-12-15 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of preparation method of transmission tower main material root long-life anticorrosion structure |
| CN108918214A (en) * | 2018-05-17 | 2018-11-30 | 中国石油天然气股份有限公司 | A kind of conglomerate sample preparation methods for core analysis and the conglomerate sample for core analysis |
| CN108986627A (en) * | 2018-06-13 | 2018-12-11 | 中国石油天然气股份有限公司 | A kind of microcosmic Visualization Model of artificial core and its preparation method and application |
| CN109060484A (en) * | 2018-10-08 | 2018-12-21 | 中国海洋石油集团有限公司 | A kind of large scale rock core and preparation method thereof for permeability saturation curve measurement |
| CN110333124A (en) * | 2019-06-12 | 2019-10-15 | 华北水利水电大学 | The reparation of rock dimensional defects and standard specimen preparation method |
| CN110715837A (en) * | 2019-10-25 | 2020-01-21 | 中国石油化工股份有限公司 | Core manufacturing method |
| CN111456715A (en) * | 2020-05-04 | 2020-07-28 | 西南石油大学 | Oil-gas well cement sheath-brittle stratum interface shear bonding strength testing device and method |
| CN112943176A (en) * | 2021-02-01 | 2021-06-11 | 重庆科技学院 | Method for measuring gas-oil relative permeability curve for simulating injection and production of oil reservoir type gas storage |
| CN113107477A (en) * | 2021-05-27 | 2021-07-13 | 成都理工大学 | Portable field sample preservation method |
| CN114200083A (en) * | 2021-12-07 | 2022-03-18 | 中海石油(中国)有限公司 | Chemical oil displacement full-process physical simulation device and method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898222A (en) * | 2017-04-14 | 2017-06-27 | 国土资源实物地质资料中心 | A kind of permanent store method of friable core |
| CN107476639A (en) * | 2017-09-22 | 2017-12-15 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of preparation method of transmission tower main material root long-life anticorrosion structure |
| CN108918214B (en) * | 2018-05-17 | 2020-12-01 | 中国石油天然气股份有限公司 | Conglomerate sample preparation method for core analysis and conglomerate sample for core analysis |
| CN108918214A (en) * | 2018-05-17 | 2018-11-30 | 中国石油天然气股份有限公司 | A kind of conglomerate sample preparation methods for core analysis and the conglomerate sample for core analysis |
| CN108986627B (en) * | 2018-06-13 | 2021-01-01 | 中国石油天然气股份有限公司 | Artificial rock core microscopic visualization model and preparation method and application thereof |
| CN108986627A (en) * | 2018-06-13 | 2018-12-11 | 中国石油天然气股份有限公司 | A kind of microcosmic Visualization Model of artificial core and its preparation method and application |
| CN109060484A (en) * | 2018-10-08 | 2018-12-21 | 中国海洋石油集团有限公司 | A kind of large scale rock core and preparation method thereof for permeability saturation curve measurement |
| CN109060484B (en) * | 2018-10-08 | 2021-06-15 | 中国海洋石油集团有限公司 | Large-size rock core for relative permeability curve determination and preparation method thereof |
| CN110333124A (en) * | 2019-06-12 | 2019-10-15 | 华北水利水电大学 | The reparation of rock dimensional defects and standard specimen preparation method |
| CN110715837A (en) * | 2019-10-25 | 2020-01-21 | 中国石油化工股份有限公司 | Core manufacturing method |
| CN111456715A (en) * | 2020-05-04 | 2020-07-28 | 西南石油大学 | Oil-gas well cement sheath-brittle stratum interface shear bonding strength testing device and method |
| CN112943176A (en) * | 2021-02-01 | 2021-06-11 | 重庆科技学院 | Method for measuring gas-oil relative permeability curve for simulating injection and production of oil reservoir type gas storage |
| CN113107477A (en) * | 2021-05-27 | 2021-07-13 | 成都理工大学 | Portable field sample preservation method |
| CN114200083A (en) * | 2021-12-07 | 2022-03-18 | 中海石油(中国)有限公司 | Chemical oil displacement full-process physical simulation device and method |
| CN114200083B (en) * | 2021-12-07 | 2024-02-23 | 中海石油(中国)有限公司 | Chemical agent oil displacement whole-flow physical simulation device and method |
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Application publication date: 20170222 |
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