CN102628761A - Artificial long core and preparation method thereof - Google Patents
Artificial long core and preparation method thereof Download PDFInfo
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- CN102628761A CN102628761A CN2012101011038A CN201210101103A CN102628761A CN 102628761 A CN102628761 A CN 102628761A CN 2012101011038 A CN2012101011038 A CN 2012101011038A CN 201210101103 A CN201210101103 A CN 201210101103A CN 102628761 A CN102628761 A CN 102628761A
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Abstract
The invention relates to an artificial long core and a preparation method thereof. The problem that the length of the traditional artificial core is hard to satisfy experimental requirements is solved. The core comprises a quartz sand and a cement; and the preparation method comprises the following steps of: first, weighing the quartz sand and the cement according to requirements; uniformly mixing the quartz sand and the cement; putting a mixture into a square steel mold; pressing and drying the mixture by a pressure testing machine; slotting the mixture by a cutter; and finally, carrying out casting and sealing treatment on cutting joints and core appearance surface by using epoxy resins so as to obtain a core with permeability of 1mD-10000mD, wherein the slotted core is of long strip shape, 200-3000 cm long and 6.25-144 cm2 in section area; and the total pore volume of the long strip shaped core is 1000-50000 cm3. The pore structure of the core is similar to the pore structure of a natural sandstone reservoir core, the length of the core is far larger than the length (100 cm) of the traditional artificial core; and experiment requirements such as chemical flooding, dynamic polymer gel formation and the like can be satisfied.
Description
Technical field
The present invention relates to a kind of rock core that oilfield chemistry oil displacement agent seepage characteristic is estimated and injection parameter is optimized that is used for, belong to a kind of artificial long rock core and preparation method thereof.
Background technology
In oilfield development process, chemical oil displacement agent is for improving the water drive development effectiveness and improving oil recovery factor and have a very important role, and the oil displacement agent product that possesses certain function often has many, and this just need be preferred to product.Product preferably according to being its seepage characteristic in reservoir cores, promptly need be carried out rock core displacement test.At present, because the natural core price is high and the restriction with specification of being originated, most synthetic cores that adopt when domestic research institution carries out rock core displacement test.
At present; That the synthetic core method for making has is quartz sand epoxy resin cementitious, several kinds of silica sand or glass bead filling and silica sand aluminum phosphate sintering etc.; Wherein silica sand aluminum phosphate sintering process is made the poor repeatability of rock core; Silica sand or glass bead filling model do not contain cementing matter, and aspect such as its pore-size and pore texture and natural core difference are bigger, and the application of these two kinds of rock cores is restricted.Quartz sand epoxy resin cementitious rock core not only blowhole size is close with natural core with architectural feature, and manufacture craft is simple, rock core is repeated good, thereby is widely used in the naphthology research at home.
But the restriction of testing machine and die size and insulation can (simulating oil deposit temperature) size owing to be under pressure, the existing quartz sand epoxy resin cementitious rock core length of monolithic is no more than 100cm, can satisfy general displacement test requirement.But for chemical oil displacement agent experimental study such as the hold-up regularity of distribution and polymer gel dynamic colloid formation in porous medium, often require rock core length will reach several meters even tens meters, existing rock core can't satisfy length requirement.Existing solution has two kinds, is through increasing fill out sand tube quantity for the fill out sand tube model, is through gate and pipeline some blocks of rock cores to be together in series for quartz sand epoxy resin cementitious rock core.Practice shows that these two kinds of rock cores all exist deficiency and defective.For through increasing the amount formed long fill out sand tube model of fill out sand tube, the one, sand-packed model itself does not contain cementing matter, and pore texture and natural core existence are than big-difference; The 2nd, after length surpassed certain size, the back-up sand difficult technique was close to ensure each fill out sand tube character.Long rock core for quartz sand epoxy resin cementitious rock core series connection formation; Oil displacement agent alternately flows in rock core and gate and pipeline; Pipeline bulk and architectural feature and rock core hole exist than big-difference, and experimental result is difficult to reflect truly the seepage flow characteristic of oil displacement agent in reservoir rocks.
Summary of the invention
Be difficult to the practical requirement technical barrier in order to solve existing synthetic core length, the invention provides a kind of artificial long rock core and preparation method thereof.This rock core is formed by quartz sand epoxy resin cementitious compacting, its pore texture and surface nature and reservoir rocks close, and also length can satisfy the requirement of displacement test to monolithic rock core length.
The technical scheme that the present invention adopted is: this rock core is made up of silica sand and cementing matter, and it is mixed and put into the square bar molding jig, through pressure testing machine compacting and oven dry; With the oven dry after rock core through the cutting machine slot; After epoxy resin is cast to slot and rock core appearance surfaces, obtain permeability 1mD～10000mD rock core, rock core is " coil pipe " shape behind the slot; Length 200cm～3000cm, rectangular rock core total pore size volume 1000cm
3～50000cm
3
The preparation method of artificial long rock core comprises the following steps:
(1) mould: mould is made up of side plate, end plate, base plate and pressing plate, and its latus inframedium and end plate are steel, and base plate is a bakelite plate, and pressing plate is a high-density plate; Square bar molding jig physical dimension: length * wide * height=30cm～120cm * 30cm～120cm * 10cm～30cm;
(2) batching: rock core is made material and is made up of silica sand and cementing matter;
(3) sand cutting: the silica sand of different-grain diameter is mixed in proportion, stir, will prepare the weighing respectively on request of the required medicine of cementing matter, pour into after the mixing in the silica sand, stir, sieve;
(4) dress mould: sand is packed into before the mould, with acetone the mould inboard is cleaned, and moves around with stragith edge along continuous straight runs in mould again, also needs the constantly adjustment stragith edge degree of depth around here, up to sand evenly till the distribution, at last with pressing plate with the sand compacting;
(5) pressurization: will load good mould and place on the pressure testing machine, the adjustment die location remains on the pressing machine bearing plate center line it, slowly boosts to design load then, voltage stabilizing 15min, release;
(6) heat: the rock core after will suppressing is put into baking oven, and constant temperature 6～8h solidifies under 85 ℃ of conditions;
(7) cutting: will solidify the tabular rock core slot in back, and obtain the long rock core of " coil pipe " shape;
(8) casting sealing: the slot rock core is placed in the wooden die, pours epoxy resin into, treat to obtain after it solidifies the rock core of design length.
The beneficial effect that the present invention had is: rock core end face of the present invention is rectangle or square, and sectional area is 6.25cm
2～144cm
2, length reaches several meters even tens meters, is suitable for chemical oil displacement agent experimental study such as the hold-up regularity of distribution and polymer gel dynamic colloid formation in porous medium.The invention solves is together in series some blocks of rock cores increases the length of rock core and causes experimental result to be difficult to reflect truly the technical matters of the seepage flow characteristic of oil displacement agent in reservoir rocks; Rock core not only blowhole size is close with natural core with architectural feature; And manufacture craft is simple, rock core is repeated good
Description of drawings:
Synoptic diagram behind Fig. 1 rock core slot;
Fig. 2 slot rock core pictorial diagram;
Fig. 3 is the structural representation of mould.
Embodiment:
Embodiment 1, mould are formed (Fig. 3) by side plate, end plate, base plate and pressing plate, and base plate bakelite plate, pressing plate are high-density plate, and all the other are carbon steel.The biside plate end face respectively has one group of eyelet, and available bolt links together two side plates, after mould is installed; Get each 8500 gram of medium sand B and coarse sand A, mix, again extracting epoxy resin 750 grams, dibutyl phthalate (DBP) 200 grams, ethylenediamine 50 grams and acetone 500 grams; Pour into after mixing in the quartz sand, stir, sieve, mix to guarantee quartz sand and cement; After with acetone the mould inboard being cleaned, with the mixture of quartz sand and the cement mould of packing into, move around with stragith edge along continuous straight runs in mould this moment; At last with pressing plate with the sand compacting, place on the pressure testing machine adjustment die location with loading good mould; It is remained on the forcing press bearing plate center line, slowly boost to design load then, voltage stabilizing 15min; Release is put into baking oven with the rock core after the compacting, and constant temperature 6h solidifies under 85 ℃ of conditions.Close the baking oven power supply, naturally cool to room temperature, the tabular rock core after solidifying is carried out slot, white lines are slot among Fig. 1, carry out integral cast with epoxy resin then, treat to obtain after it solidifies " coil pipe " shape rock core of design length.Core permeability 5000mD, length 960cm.
Embodiment 2, mould are formed (see figure 3) by side plate, end plate, base plate and pressing plate, and base plate bakelite plate, pressing plate are high-density plate, and all the other are carbon steel.The biside plate end face respectively has one group of eyelet, and available bolt links together two side plates, after mould is installed, gets each 9000 gram of medium sand B and fine sand C; Extracting epoxy resin 600 grams, dibutyl phthalate (DBP) 112 grams, ethylenediamine 48 grams and acetone 240 grams are poured in the quartz sand after mixing again, stir, sieve, and mix to guarantee quartz sand and cement; After with acetone the mould inboard being cleaned, with the mixture of quartz sand and the cement mould of packing into, move around with stragith edge along continuous straight runs in mould this moment; At last with pressing plate with the sand compacting, place on the pressure testing machine adjustment die location with loading good mould; It is remained on the forcing press bearing plate center line, slowly boost to design load then, voltage stabilizing 15min; Release is put into baking oven with the rock core after the compacting, and constant temperature 6h solidifies under 85 ℃ of conditions.Close the baking oven power supply, naturally cool to room temperature, the tabular rock core after the heating cure is carried out slot, carry out integral cast with epoxy resin then, treat to obtain after it solidifies " coil pipe " shape rock core of design length.Core permeability 3000mD, length 960cm.
Embodiment 3, mould are formed (see figure 3) by side plate, end plate, base plate and pressing plate etc., and base plate and pressing plate are hardwood, and all the other are carbon steel.The biside plate end face respectively has one group of eyelet, and available bolt links together two side plates, after mould is installed, coarse sand A and fine sand C is respectively got 9500 grams; With epoxy resin 300 grams, dibutyl phthalate (DBP) 56 grams, ethylenediamine 24 grams and acetone 120 grams, pour in the quartz sand after mixing again, stir, sieve, mix to guarantee quartz sand and cement; After with acetone the mould inboard being cleaned, with the mixture of quartz sand and the cement mould of packing into, move around with stragith edge along continuous straight runs in mould this moment; At last with pressing plate with the sand compacting, place on the pressure testing machine adjustment die location with loading good mould; It is remained on the forcing press bearing plate center line, slowly boost to design load then, voltage stabilizing 15min; Release is put into baking oven with the rock core after the compacting, and constant temperature 6h solidifies under 85 ℃ of conditions.Close the baking oven power supply, naturally cool to room temperature, the tabular rock core after the heating cure is carried out slot, carry out integral cast with epoxy resin then, treat to obtain after it solidifies " coil pipe " shape rock core of design length.Core permeability 9000mD, length 960cm.
Claims (2)
1. artificial long rock core, this rock core is made up of silica sand and cementing matter, and it is mixed and put into the square bar molding jig; Through pressure testing machine compacting and oven dry, it is characterized in that: the rock core after will drying is through the cutting machine slot, after epoxy resin slot and rock core appearance surfaces are cast; Obtain permeability 1mD～10000mD rock core; Rock core is " coil pipe " shape behind the slot, length 200cm～3000cm, rectangular rock core total pore size volume 1000cm
3～50000cm
3
2. the preparation method of the described artificial long rock core of claim 1 comprises the following steps:
(1) mould: mould is made up of side plate, end plate, base plate and pressing plate, and its latus inframedium and end plate are steel, and base plate is a bakelite plate, and pressing plate is a high-density plate; Square bar molding jig physical dimension: length * wide * height=30cm～120cm * 30cm～120cm * 10cm～30cm;
(2) batching: rock core is made material and is made up of silica sand and cementing matter;
(3) sand cutting: the silica sand of different-grain diameter is mixed in proportion, stir, will prepare the weighing respectively on request of the required medicine of cementing matter, pour into after the mixing in the silica sand, stir, sieve;
(4) dress mould: sand is packed into before the mould, with acetone the mould inboard is cleaned, and moves around with stragith edge along continuous straight runs in mould again, also needs the constantly adjustment stragith edge degree of depth around here, up to sand evenly till the distribution, at last with pressing plate with the sand compacting;
(5) pressurization: will load good mould and place on the pressure testing machine, the adjustment die location remains on the pressing machine bearing plate center line it, slowly boosts to design load then, voltage stabilizing 15min, release;
(6) heat: the rock core after will suppressing is put into baking oven, and constant temperature 6～8h solidifies under 85 ℃ of conditions;
(7) cutting: will solidify the tabular rock core slot in back, and obtain " coil pipe " shape rock core;
(8) casting sealing: the slot rock core is placed in the wooden die, pours epoxy resin into, treat to obtain after it solidifies the rock core of design length.
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| CN102749275A (en) * | 2012-06-04 | 2012-10-24 | 东北石油大学 | Visualized artificial core model and preparation method thereof |
| CN103454380A (en) * | 2013-08-15 | 2013-12-18 | 中国石油天然气股份有限公司 | Artificial rock core for evaluating damage of unconsolidated strata and manufacturing method thereof |
| CN103616270A (en) * | 2013-12-01 | 2014-03-05 | 东北石油大学 | Preparation method of lateral accretion interlayer artificial core and special tool |
| CN103983489A (en) * | 2014-05-26 | 2014-08-13 | 中国石油大学(华东) | Preparation method of crack type carbonate rock core |
| CN104295281A (en) * | 2014-06-03 | 2015-01-21 | 中国石油大学(北京) | Shale gas reservoir complex fracture conductivity simulation experiment method |
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