CN103868772B - A kind of synthetic core preparation method for rock drillability test - Google Patents
A kind of synthetic core preparation method for rock drillability test Download PDFInfo
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- CN103868772B CN103868772B CN201410100159.0A CN201410100159A CN103868772B CN 103868772 B CN103868772 B CN 103868772B CN 201410100159 A CN201410100159 A CN 201410100159A CN 103868772 B CN103868772 B CN 103868772B
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Abstract
That the present invention relates to is a kind of synthetic core preparation method for rock drillability test, this synthetic core preparation method for rock drillability test: one, the preparation of cementing matter and mineral, take the rock forming mineral combination 8.5 ~ 9 parts that the outfit of corresponding rock-drillability index value is perfect by weight, cementing matter 0.5 ~ 1.5 part, be placed in container, then the water adding 0.05 part stirs; Two, the preparation of model: evenly loaded in mould by the potpourri of rock forming mineral and cementing matter, with pressing plate by its compacting; Three, the mould loaded is placed on pressure testing machine, then slowly boosts to 10 ~ 80 atmospheric pressure, voltage stabilizing 20 minutes, release; Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 6 ~ 8 hours, naturally cools, obtains the synthetic core with certain rock-drillability index value.Rock core prepared by the present invention and natural core have good similarity in physico-mechanical properties, and by adjusting content, proportioning, the granularity of mineral composition, cementing matter content and pressing pressure etc., can prepare the synthetic core with different rock-drillability index value.
Description
One, technical field:
What the present invention relates to is be applied in for the synthetic core that formation rock simulation and rate of penetration are analyzed in petroleum engineering, mining engineering, Geotechnical Engineering and rock failure field, and that be specifically related to is a kind of synthetic core preparation method for rock drillability test.
Two, background technology:
In the scientific research of oil field, usually need to use rock core to carry out simulating lab test.Natural core affects by size of the hole, small volume of coring, and cannot carry out large scale rock test experiments.Along with deepening continuously of oil-gas exploration and development, well depth from middle-shallow layer to deep layer, ultra-deep layer extend, difficulty of coring increases day by day, and large section is cored very difficult, and expense of coring is more and more higher.At present, due to natural all deficiencies of coring, domestic a lot of research institution all adopts synthetic core to carry out simulating lab test.Explore stratigraphic rules by the simulated experiment of synthetic core, on volume, cost, synthetic core is far superior to natural core.The synthetic core of current application has quartz sand epoxy resin cementitious, silica sand filling, silica sand aluminum phosphate cementing etc. three kinds, and wherein, quartz sand epoxy resin cementitious model is most widely used.These synthetic cores mainly lay particular emphasis on the performance evaluation of carrying out oil displacement test and chemical assistant product.And still do not have for the synthetic core patent of invention of simulated formation rock drillability aspect.
Correct understanding rock drillability, to how choosing, designing drill bit, improves rate of penetration significant.Rock drillability shop experiment petroleum industry standard SY/T5426-2000 is micro drill method, namely holes on rock sample with micro drill, determines rock drillability level value by during real boring.The method test rock drillability needs to use a large amount of core samples, and for the block not carrying out coring operation or rock core information and be of great rarity, the application of this method will be subject to certain restrictions.Therefore, if indoor can prepare the rock-drillability index value synthetic core close with natural core, so the analyst coverage such as rock drillability and indoor full gauge bit simulated experiment will increase greatly, and experimental cost also significantly reduces.
Three, summary of the invention:
The object of this invention is to provide a kind of synthetic core preparation method for rock drillability test, drilling and coring delivery size be little, quantity is few for solving for it, problem costly.
The technical solution adopted for the present invention to solve the technical problems is: this synthetic core preparation method for rock drillability test:
One, the preparation of cementing matter and mineral:
When the rock-drillability index value preparing rock core is 1 ~ 3, filters out evengranular clay 1 part, add 0.5 part of water, and stir, obtain cementing matter; Talcum, gypsum, kalzit is used to prepare rock forming mineral, wherein the content of talcum is 50% by weight, the content of gypsum is 45% by weight, the content of kalzit is 5% by weight, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 50%, granularity is 60 ~ 100 object particle proportions is 40%, and granularity is 80 ~ 200 object particle proportions is 10%;
When the rock-drillability index value preparing rock core is 4 ~ 6, take epoxy resin 0.8 ~ 1.2 part, dibutyl phthalate 0.1 ~ 0.5 part, ethylenediamine 0.05 ~ 0.2 part by weight respectively, pour in beaker and fully stir and add 0.2 ~ 0.6 part, acetone, and again fully stir, wait for 4 ~ 6 hours, obtain cementing matter; Fluorite, apatite, feldspar is used to prepare rock forming mineral, wherein the content of fluorite, apatite, feldspar is by weight: the fluorite of 30%, the apatite of 55%, 15% feldspar, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 25%, granularity is 60 ~ 100 object particle proportions is 50%, and granularity is 80 ~ 200 object particle proportions is 25%;
When the rock-drillability index value preparing rock core is 7 ~ 10, take the epoxy resin 0.8 ~ 1.2 part of organic siliconresin and the composite modified rear preparation of polyvinyl butyral, dibutyl phthalate 0.1 ~ 0.5 part, ethylenediamine 0.05 ~ 0.2 part, pour in beaker and fully stir and add 0.2 ~ 0.6 part, acetone, and again fully stir, wait for 4 ~ 6 hours, obtain cementing matter; Quartz, topaz, feldspar is used to prepare rock forming mineral, wherein the content of quartz, topaz, feldspar is by weight: the quartz of 55%, the feldspar of 30%, 15% topaz, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 25%, granularity is 60 ~ 100 object particle proportions is 50%, and granularity is 80 ~ 200 object particle proportions is 25%;
Take the rock forming mineral combination 8.5 ~ 9 parts that the above-mentioned outfit of corresponding rock-drillability index value is perfect by weight, cementing matter 0.5 ~ 1.5 part, is placed in container, then the water adding 0.05 part stirs;
Two, the preparation of model: mould is made up of side plate, end plate, base plate and pressing plate, base plate and pressing plate are hardwood, and all the other are carbon steel; Before the potpourri of rock forming mineral and cementing matter loads mould, with acetone, die inside is cleaned so that the demoulding, the potpourri of rock forming mineral and cementing matter is evenly loaded in mould, with pressing plate by its compacting;
Three, obtain synthetic core through pressurization and heating: be placed on pressure testing machine by the mould loaded, adjustment die location, makes it remain on pressing machine bearing plate center line, then slowly boosts to 10 ~ 80 atmospheric pressure, voltage stabilizing 20 minutes, release; Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 6 ~ 8 hours, closes baking oven power supply, naturally cools to room temperature, obtain the synthetic core with certain rock-drillability index value.
Synthetic core provided by the invention presses certain weight proportion by cementing matter and one or more rock forming minerals, forms in uniform temperature and pressure system.Wherein cementing matter mainly comprises clay, epoxy resin, dibutyl phthalate, ethylenediamine, acetone, epoxy resin etc. with organic siliconresin and the composite modified rear preparation of polyvinyl butyral.Rock forming mineral is the talcum, gypsum, kalzit, fluorite, apatite, feldspar, quartz, topaz, corundum, adamas etc. of different-grain diameter.
The rock drillability classification related in preparation method of the present invention is according to micro drill method in petroleum industry SY/T5426-2000.Rock drillability is divided into 1 ~ 10 by during real boring by micro drill method, comprises soft formation when rock drillability is 1 ~ 3, medium ground when rock-drillability index value is 4 ~ 6, hard formation when rock-drillability index value is 7 ~ 10.
Beneficial effect:
(1) rock core prepared of the present invention and natural core have good similarity in physico-mechanical properties, by adjusting content, proportioning, the granularity of mineral composition, cementing matter content and pressing pressure etc., can prepare the synthetic core with different rock-drillability index value;
(2) for coring difficulty or need the experiment of a large amount of rock core, in order to cost-saving, the synthetic core close with natural core rock-drillability index value can be applied and test;
(3) because natural core volume is little, full gauge bit cannot be realized on the ground and creep into experiment, large-sized synthetic core can be made test;
(4) raw material sources of making rock core is wide, price is low, and rock core has good repeatability and can produce in batches, and therefore the expense of monolithic rock core is more much lower than natural core.
Four, embodiment:
Embodiment 1:
One, prepare the synthetic core that rock-drillability index value is 2, filter out evengranular clay 1 part, add 0.2 part of water, and stir, obtain cementing matter; Talcum, gypsum, kalzit is used to prepare rock forming mineral, wherein the content of talcum is 50% by weight, the content of gypsum is 45% by weight, the content of kalzit is 5% by weight, described mineral grain demand fulfillment is by weight simultaneously:: granularity is 10 ~ 50 object particle proportions is 50%, granularity is 60 ~ 100 object particle proportions is 40%, and granularity is 80 ~ 200 object particle proportions is 10%.
The rock forming mineral taking corresponding above-mentioned outfit by weight perfect combines 8.5 parts, and cementing matter 0.5 part, is placed in container, then the water adding 0.05 part stirs.
Two, the preparation of model: mould is made up of side plate, end plate, base plate and pressing plate, base plate and pressing plate are hardwood, and all the other are carbon steel; Before the potpourri of rock forming mineral and cementing matter loads mould, with acetone, die inside is cleaned so that the demoulding, the potpourri of rock forming mineral and cementing matter is evenly loaded in mould, with pressing plate by its compacting.
Three, obtain synthetic core through pressurization and heating: be placed on pressure testing machine by the mould loaded, adjustment die location, makes it remain on pressing machine bearing plate center line, then slowly boosts to 10 ~ 80 atmospheric pressure, voltage stabilizing 20 minutes, release; Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 6 ~ 8 hours, closes baking oven power supply, naturally cools to room temperature, obtain the synthetic core that rock-drillability index value is 2.
Embodiment 2:
Prepare the synthetic core that rock-drillability index value is 5.Screening the fluorite of 30%, the apatite of 55% and 15% spectra particle, make that granularity is 10 ~ 50 orders, 60 ~ 100 orders and 80 ~ 200 object particle proportions are respectively 25%, 50% and 25% by weight, three kinds of mineral are mixed, takes mixed mineral particle 8 parts by weight; Take epoxy resin 1 part, dibutyl phthalate 0.4 part, ethylenediamine 0.15 part by weight respectively, pour in beaker and fully stir and add 0.4 part, acetone, and again fully stir, wait for 4 ~ 6 hours, obtain cementing matter; Then take cementing matter 1.5 parts, add in mixed mineral particle, and add 0.05 part of water, stir; With acetone, die inside is cleaned so that the demoulding, multiple film mineral are evenly loaded in mould, with pressing plate by sand compacting; Be placed on pressure testing machine by the mould loaded, adjustment die location, makes it remain on pressing machine bearing plate center line, then slowly boosts to 14 atmospheric pressure, voltage stabilizing 20 minutes, release.Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 6 hours, closes baking oven power supply, naturally cools to room temperature, obtain the synthetic core with certain drillability; Be placed in by this synthetic core on rock drillability tester, adopt tooth-wheel bit pattern, the pressure of the drill is set to 889.66N, and rotating speed is set to 55rpm, measures the time of creeping into 2.4mm and using, in triplicate, and mean value t when asking for brill, application of formula
, obtain rock-drillability index value and be about 5.
Embodiment 3:
Prepare the synthetic core that rock-drillability index value is 7.Screening the feldspar of 30%, the quartz of 55% and 15% topac mine composition granule, make that granularity is 10 ~ 50 orders, 60 ~ 100 orders and 80 ~ 200 object particle proportions are respectively 25%, 50% and 25% by weight, three kinds of mineral are mixed, takes mixed mineral particle 8 parts by weight; Take epoxy resin 1 part, dibutyl phthalate 0.3 part, the ethylenediamine 0.15 part with organic siliconresin and the composite modified rear preparation of polyvinyl butyral by weight respectively, pour in beaker and fully stir and add 0.5 part, acetone, and again fully stir, wait for 5 hours, obtain cementing matter; Then take cementing matter 1 part, add in mixed mineral particle, and add 0.05 part of water, stir; With acetone, die inside is cleaned so that the demoulding, multiple film mineral are evenly loaded in mould, with pressing plate by sand compacting; Be placed on pressure testing machine by the mould loaded, adjustment die location, makes it remain on pressing machine bearing plate center line, then slowly boosts to 40 atmospheric pressure, voltage stabilizing 20 minutes, release.Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 7 hours, closes baking oven power supply, naturally cools to room temperature, obtain the synthetic core with certain drillability; Be placed in by this rock core on rock drillability tester, adopt tooth-wheel bit pattern, the pressure of the drill is set to 889.66N, and rotating speed is set to 55rpm, measures the time of creeping into 2.4mm and using, in triplicate, and mean value t when asking for brill, application of formula
, obtain rock-drillability index value and be about 7.
Claims (1)
1., for a synthetic core preparation method for rock drillability test, it is characterized in that:
One, the preparation of cementing matter and mineral:
When the rock-drillability index value preparing rock core is 1 ~ 3, filters out evengranular clay 1 part, add 0.2 part of water, and stir, obtain cementing matter; Talcum, gypsum, kalzit is used to prepare rock forming mineral, wherein the content of talcum is 50% by weight, the content of gypsum is 45% by weight, the content of kalzit is 5% by weight, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 50%, granularity is 60 ~ 100 object particle proportions is 40%, and granularity is 80 ~ 200 object particle proportions is 10%;
When the rock-drillability index value preparing rock core is 4 ~ 6, take epoxy resin 0.8 ~ 1.2 part, dibutyl phthalate 0.1 ~ 0.5 part, ethylenediamine 0.05 ~ 0.2 part by weight respectively, pour in beaker and fully stir and add 0.2 ~ 0.6 part, acetone, and again fully stir, wait for 4 ~ 6 hours, obtain cementing matter; Fluorite, apatite, feldspar is used to prepare rock forming mineral, wherein the content of fluorite, apatite, feldspar is by weight: the fluorite of 30%, the apatite of 55%, 15% feldspar, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 25%, granularity is 60 ~ 100 object particle proportions is 50%, and granularity is 80 ~ 200 object particle proportions is 25%;
When the rock-drillability index value preparing rock core is 7 ~ 10, take the epoxy resin 0.8 ~ 1.2 part of organic siliconresin and the composite modified rear preparation of polyvinyl butyral, dibutyl phthalate 0.1 ~ 0.5 part, ethylenediamine 0.05 ~ 0.2 part, pour in beaker and fully stir and add 0.2 ~ 0.6 part, acetone, and again fully stir, wait for 4 ~ 6 hours, obtain cementing matter; Quartz, topaz, feldspar is used to prepare rock forming mineral, wherein the content of quartz, topaz, feldspar is by weight: the quartz of 55%, the feldspar of 30%, 15% topaz, described mineral grain demand fulfillment is by weight simultaneously: granularity is 10 ~ 50 object particle proportions is 25%, granularity is 60 ~ 100 object particle proportions is 50%, and granularity is 80 ~ 200 object particle proportions is 25%;
Take the rock forming mineral 8.5 ~ 9 parts that the above-mentioned outfit of corresponding rock-drillability index value is perfect by weight, cementing matter 0.5 ~ 1.5 part, is placed in container, then the water adding 0.05 part stirs;
Two, the preparation of model: mould is made up of side plate, end plate, base plate and pressing plate, base plate and pressing plate are hardwood, and all the other are carbon steel; Before the potpourri of rock forming mineral and cementing matter loads mould, with acetone, die inside is cleaned so that the demoulding, the potpourri of rock forming mineral and cementing matter is evenly loaded in mould, with pressing plate by its compacting;
Three, obtain synthetic core through pressurization and heating: be placed on pressure testing machine by the mould loaded, adjustment die location, makes it remain on pressing machine bearing plate center line, then slowly boosts to 10 ~ 80 atmospheric pressure, voltage stabilizing 20 minutes, release; Rock core after compacting is put into baking oven, and under 90 DEG C of conditions, constant temperature solidification in 6 ~ 8 hours, closes baking oven power supply, naturally cools to room temperature, obtain the synthetic core with certain rock-drillability index value.
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| CN104390825B (en) * | 2014-11-20 | 2019-10-25 | 中国石油大学(北京) | A kind of artificial core and preparation method thereof of controllable movable fluid |
| CN104458383B (en) * | 2014-12-19 | 2017-10-03 | 西南石油大学 | A kind of preparation method of artificial core |
| CN105571917A (en) * | 2015-12-28 | 2016-05-11 | 东北石油大学 | Lengthened artificial rock core, and preparation method and preparation device thereof |
| CN105865868B (en) * | 2016-04-01 | 2018-05-15 | 四川大学 | The artificially preparation method of the rock sample of structural plane containing different directions |
| CN105973660B (en) * | 2016-04-26 | 2018-11-09 | 中国石油化工股份有限公司 | A kind of preparation method of artificial core and the artificial core prepared by this method |
| CN106908292A (en) * | 2017-02-28 | 2017-06-30 | 中国石油化工股份有限公司 | A kind of mud shale artificial core preparation method and application |
| CN108801722B (en) * | 2017-05-03 | 2021-05-25 | 中国石油化工股份有限公司 | Preparation method of rock core model of salt shale oil reservoir |
| CN110320122B (en) * | 2019-06-12 | 2022-06-10 | 华北水利水电大学 | Accurate detection method for rock mineral abrasiveness |
| CN113006779B (en) * | 2021-03-03 | 2023-01-20 | 中国石油大学(北京) | Evaluation method and correction method for drillability level value of conglomerate stratum rock |
| CN113532990B (en) * | 2021-07-15 | 2023-11-14 | 西南石油大学 | Preparation method of compact sandstone oil displacement core with argillaceous interlayer |
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