CN106370486B - The method for drilling through technology making artificial rock core using freezing - Google Patents
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- CN106370486B CN106370486B CN201510439121.0A CN201510439121A CN106370486B CN 106370486 B CN106370486 B CN 106370486B CN 201510439121 A CN201510439121 A CN 201510439121A CN 106370486 B CN106370486 B CN 106370486B
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Abstract
The present invention provides a kind of method for drilling through technology making artificial rock core using freezing, this includes: step 1 using the method that freezing drills through technology making artificial rock core, designs core model formula, determines the ratio of different grain size quartz sand and clay；Step 2, the filling and compacting of sand material are carried out；Step 3, the model pressed is freezed, then takes out and carry out liquid nitrogen immediately and drills through rock core, the rock core drilled through is freezed again；Step 4, the rock core drilled through in freezing is taken out, is encapsulated, pressurizeed, is finally dried for standby sample.The research needs in terms of flow through oil reservoir mechanism can more fully be met using the method that freezing drills through technology making artificial rock core, can more fully simulate the main physical parameter of reservoir rocks at the advantages of combining current various Artificial Core Making methods.
Description
Technical field
The present invention relates to oil field development technical field, especially relate to a kind of drill through technology producer's lithogenesis using freezing
The method of the heart.
Background technique
Natural reservoir rocks have solid (glue) knot and loose two kinds of forms, and usual pore structure is more complicated, hole inner wall ratio
It is rougher, various clay minerals are filled, there is up to a hundred microns of big pore throat, also there is the small pore throat less than 1 percent microns, are permeated
Rate range is wide；The various composition for forming rock is complicated, contacts for a long time with crude oil and water, and wetability has hydrophilic, neutral and oleophylic,
And it is non-uniform wet, has many characteristics, such as mixing wetting, dalmatian wettability.
Currently, there are many method of manual manufacture rock core, mainly there are aluminum phosphate rock core, epoxy resin rock by core character point
The heart, artificial back-up sand (or bead etc.) rock core.First two is consolidated core, rock core appearance be it is exposed, manufacture craft has similar
Place；Artificial back-up sand rock core is loose core, is formed by the fill out sand tube covered outside rock core.The characteristics of three kinds of artificial cores, is not
It is same:
1, aluminum phosphate rock core
Last century the seventies, Shengli Oil Field geology institute Tang Renqi et al. invented phosphoric acid aluminium pattern, and at 1985 the 6th
Phase " oil drilling technology " publishes an article " production and research of artificial areal model ", and the production of phosphoric acid aluminium pattern is described in detail
Technique and application apply for a patent (publication number is CN1587960 A) by Yang Huaijun etc. in this technology 2004.Subsequent phosphoric acid aluminium pattern
Be continuously available development, successively have Tang Renqi " production and research of GM synthetic core sample " (" compound oil gas field " the 3rd phase in 1994),
" SL-II physical models of reservoir " (" petroleum journal " the 6th phase in 2003) of Wang Jian etc. etc..
Phosphoric acid aluminium pattern is by consolidated model made of high temperature sintering, and pore surface is relatively rough, is amenable to high temperature height
Pressure, intrusive mercury curve relatively reservoir rocks etc., are its superior places compared with epoxy resin pattern；But its maximum deficiency
It is that clay property is lost seriously under high temperature, part fine pore is burned off.Model is due to passing through high temperature sintering, so initial wetting
Property is strong hydrophilicity.
2, epoxy resin rock core
Epoxy resin pattern is also to begin in the 1970s and 1980s in last century in the field uses such as grand celebration, triumph, Tang Renqi
" production and research of HNT synthetic core sample " (" oil drilling technology " first phase in 1998), Lu Xiangguo etc. " quartz sand epoxy
Refined etc. " a kind of argillaceous people of plastic bonding rock core and preparation method thereof " (2005, publication number: CN1664547 A), ten thousand gold medals
The production method of work rock core " (2006, publication number: CN100573092C) is all epoxy resin pattern.
Epoxy resin pattern is a kind of low temperature consolidated model, is to adhere to one layer of epoxy resin in sand grain surface, then glues again
The substances such as attached clay are a kind of rock cores containing clay property, this is it than phosphoric acid aluminium pattern biggest advantage.But epoxy resin
Solidifying rear surface is in glassy state, very smooth, and some micro-pores also can be glued dead, also easily-deformable under high temperature and pressure；Together
When epoxy resin be a kind of oleophilic substance, model initial wetting property is essentially oleophylic.
Patent CN100545625C and patent CN102757212 B also belong to consolidated core, but do not disclose which kind of is used
Cementing agent.
3, fill out sand tube rock core
Also very early, manufacture difficulty is minimum for artificial back-up sand (or bead etc.) rock core application, is non-cementing using also most extensively
Rock core.Varigrained sand material is added in fill out sand tube when production, by tapping fill out sand tube constantly come vibrating compacting sand material,
Model can keep the property and grade composition of various clays.Its deficiency is the heavy workload mainly by being accomplished manually, inside rock core
Homogenieity be difficult to control, the compaction of sand grains is limited, and compared with reservoir rocks, it is inclined that similar particle sizes form lower core permeability
Height is easy to appear the migration of sand grains when displacement inside rock core, blocking of shaking out is formed at displacement process outlet pipeline.
It appears rock core in addition there are one kind, is to choose the distinctive natural rock in somewhere, coring obtains after exploiting large rock mass,
Belong to the rock core of artificial rather than artificial core.Its pore structure is similar to reservoir rocks, but its exploitation, transportation cost height,
And what physical property was naturally occurring, it can not achieve the design requirements such as specified particle size composition, clay component and content, and obtain at present
The appearing core permeability obtained is all relatively low, is difficult to obtain the rock core that permeability is higher than 1000 millidarcies.
Thus we have invented a kind of new method for drilling through technology making artificial rock core using freezing, solves the above skill
Art problem.
Summary of the invention
The object of the present invention is to provide the Artificial Core Making sides that one kind can more comprehensively simulate the main physical property of reservoir rocks
Method provides the utilization of the model more like with the porous media properties of natural reservoir rocks to carry out various flow through oil reservoir experiments
Freeze the method for drilling through technology making artificial rock core.
The purpose of the present invention can be achieved by the following technical measures: the side of technology making artificial rock core is drilled through using freezing
Method, this includes: step 1 using the method that freezing drills through technology making artificial rock core, designs core model formula, determines different grains
Spend the ratio of quartz sand and clay；Step 2, the filling and compacting of sand material are carried out；Step 3, the model pressed is freezed, is then taken
It carries out liquid nitrogen out and immediately and drills through rock core, the rock core drilled through is freezed again；Step 4, the rock core drilled through in freezing is taken out,
It encapsulated, pressurizeed, be finally dried for standby sample.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, according to the physical parameter of target reservoir, including granularmetric composition, clay component and content, to determine not
The ratio of one-size quartz sand and clay, and wetability processing is carried out to quartz sand surface according to the wettability characteristics of oil reservoir.
In step 2, according to the amount of quartz sand and clay, suitable quantity of water is added by a certain percentage, is sufficiently stirred, makes sand material slightly
Micro- wetting；Back-up sand mold is got out, sand material is uniformly poured into mold, the sand material in mold is compacted with hydraulic press.
In step 3, the model pressed is put into -70 DEG C of low temperature refrigerator and is freezed 24 hours, then taken out and immediately
It carries out liquid nitrogen and drills through rock core, the rock core drilled through is placed into -70 DEG C of low temperature refrigerators and is freezed 4 hours or more.
In step 4, the rock core drilled through in freezing is taken out, by the method for laboratory encapsulating loose samples, to rock core
Sheet lead encapsulating, and curable type of pressurizeing in core holding unit are carried out, is then placed in baking oven, dried 48 hours at 65 DEG C or so or more
It can be spare.
The method for drilling through technology making artificial rock core using freezing in the present invention, step includes: core model formula
Design, the filling and compacting of sand material in a mold, the freezing of core model drills through, the encapsulating of rock core and drying etc..This method root
According to the physical parameter of reservoir cores, such as granularity, clay content, permeability, porosity, pressure mercury hair are buckled line, wetability, to set
Count sand material formula, the granularmetric composition for the rock core produced and clay content and reservoir rocks are close, intrusive mercury curve show with naturally
Reservoir cores height is similar, and initial wetting property can be from hydrophilic to oleophylic, and can realize mixing wetting state, and permeability range can
Control is more than several millidarcies to millidarcies up to ten thousand.This method is easy to operate, and fabrication cycle is short, overcomes current artificial core
Some not perfect places present in terms of clay property, pore structure, wetability, can more fully meet oil
The research needs in terms of seepage flow mechanism are hidden, current various Artificial Core Making method advantages, comprehensive simulated oil reservoir rock are combined
The main physical parameter of stone, has that clay property, pore structure be similar to oil reservoir, wetability meets that oil reservoir is practical, permeability range
Big advantage.Compared to the prior art, the invention has the following advantages:
1. this method uses cryogenic freezing forming technique, the clay property in rock core is completely remained；
2. without high temperature sintering, fine pore is completely retained, the pore structure of intrusive mercury curve reflection and same lithology
Practical reservoir rocks it is consistent；
3. the rock core initial wetting property of this method production is strong hydrophilicity, the types such as slightly water-wet, neutrality, oleophylic are adjustable into,
And it can realize mixing wetting state；
4. under same recipe, the model compaction of freezing boring method production is bigger, and density is higher, and permeability can control
Must be lower, while also reducing shake out probability of the model in displacement test.
Detailed description of the invention
Fig. 1 is the process of a specific embodiment of the method that technology making artificial rock core is drilled through using freezing of the invention
Figure；
Fig. 2 is the intrusive mercury curve for the rock core produced in a specific embodiment of the invention.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the flow charts of the method that technology making artificial rock core is drilled through using freezing of the invention.
In step 101, core model formula is designed.The step is according to the physical parameter of target reservoir, such as granularmetric composition, viscous
Native ingredient and content, to determine the ratio of different grain size quartz sand and clay, and according to the wettability characteristics of oil reservoir to quartz sand
Surface carries out wetability processing.
In step 102, the filling and compacting of sand material are carried out.According to the amount of quartz sand and clay in the step, by certain ratio
Suitable quantity of water is added in example, is sufficiently stirred, soaks sand material slightly.Back-up sand mold is got out, sand material is uniformly poured into mold, liquid is used
Press is compacted the sand material in mold.
In step 103, carries out the freezing of model and drill through.The model pressed is put into the step cold in low temperature refrigerator
Freeze, then take out and carry out liquid nitrogen immediately and drill through rock core, the rock core drilled out is placed into low temperature refrigerator and is freezed.
In step 104, rock core is encapsulated and dried.The rock core drilled through is taken out from low temperature refrigerator, encapsulates and dredges by laboratory
The method of loose sample is encapsulated, is pressurizeed, and sample is finally put into baking oven and is dried for standby.
In an application specific embodiment of the invention, comprise the steps that
1) formula design
For the listed formula of following table 1, the quartz sand and clay of different grain groups are weighed in proportion, and as needed by part
Quartz sand surface carries out wetability processing, can reach mixing wetting effect.
1 quartz sand of table and clay ratios formula
2) filling compacting
It first gets out 30cm × 30cm × 12cm mold on hydraulic machine platform, the sand material of weighing is uniformly mixed, and
Suitable water is added (sand material can be agglomerating with holding).It weighs a certain amount of sand material to pour into mold, stir, cover
Briquetting is depressed with hydraulic press, model is made to reach design thickness by upper holder block.
3) freezing drills through
The model pressed is removed from the molds, freezes 24 hours in the careful low temperature refrigerator for moving into -70 DEG C, then uses
Liquid nitrogen does circulation fluid and drills through rock core, places into -70 DEG C of low temperature refrigerators and freezes 4 hours or more.
4) encapsulating drying
The rock core frozen is taken out from refrigerator, by the method for laboratory encapsulating loose samples, sheet lead packet is carried out to rock core
Envelope, and curable type of pressurizeing in core holding unit are then placed in baking oven, and drying 48 hours at 65 DEG C or so or more can be spare.
Fig. 2 is the intrusive mercury curve for the rock core produced, and table 2 is its characteristic parameter.
The surveyed rock core characteristic parameter of table 2
The foregoing is merely presently preferred embodiments of the present invention, non-to limit the scope of the patents of the invention, other are with this
The equivalence changes of the patent spirit of invention should all belong to the scope of the patents of the invention.
Claims (1)
1. the method for drilling through technology making artificial rock core using freezing, which is characterized in that this drills through technology producer using freezing
The method of the lithogenesis heart includes:
Step 1, core model formula is designed, determines the ratio of different grain size quartz sand and clay；
Step 2, the filling and compacting of sand material are carried out；
Step 3, the model pressed is freezed, then takes out and carry out liquid nitrogen immediately and drills through rock core, the rock core drilled through is cold again
Freeze；
Step 4, the rock core drilled through in freezing is taken out, is encapsulated, pressurizeed, is finally dried for standby sample；
In step 1, according to the physical parameter of target reservoir, including granularmetric composition, clay component and content, to determine different grains
The ratio of quartz sand and clay is spent, and wetability processing is carried out to quartz sand surface according to the wettability characteristics of oil reservoir；
In step 2, according to the amount of quartz sand and clay, suitable quantity of water is added by a certain percentage, is sufficiently stirred, moistens sand material slightly
It is wet；Back-up sand mold is got out, sand material is uniformly poured into mold, the sand material in mold is compacted with hydraulic press；
In step 3, the model pressed is put into -70 DEG C of low temperature refrigerator and is freezed 24 hours, then taken out and carry out immediately
Liquid nitrogen drills through rock core, and the rock core drilled through is placed into -70 DEG C of low temperature refrigerators and is freezed 4 hours or more；
In step 4, the rock core drilled through in freezing is taken out, by the method for laboratory encapsulating loose samples, rock core is carried out
Sheet lead encapsulating, and curable type of pressurizeing in core holding unit, are then placed in baking oven, dried 48 hours at 65 DEG C or so or more
It is spare.
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| CN106769330A (en) * | 2017-02-10 | 2017-05-31 | 西南石油大学 | One kind point contact demoulding artificial core preparation facilities and method |
| CN109443886B (en) * | 2019-01-15 | 2021-01-05 | 中国石油大学(华东) | Method for manufacturing simulated rock core with fixed pore throat and particle surface property |
| CN114002123B (en) * | 2021-10-29 | 2024-05-10 | 中国海洋石油集团有限公司 | Loose hypotonic sandstone particle migration experimental method |
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| CN101514614A (en) * | 2009-04-02 | 2009-08-26 | 吉林大学 | Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method |
| CN102866043A (en) * | 2012-09-07 | 2013-01-09 | 中国石油天然气集团公司 | Manufacturing method for fracture-cave rock core physical model |
| CN104198243A (en) * | 2014-08-29 | 2014-12-10 | 中国石油天然气股份有限公司 | Preparation method of artificial core for simulating hydrate stratum skeleton in frozen soil area |
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2015
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|---|---|---|---|---|
| CN101514614A (en) * | 2009-04-02 | 2009-08-26 | 吉林大学 | Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method |
| CN102866043A (en) * | 2012-09-07 | 2013-01-09 | 中国石油天然气集团公司 | Manufacturing method for fracture-cave rock core physical model |
| CN104198243A (en) * | 2014-08-29 | 2014-12-10 | 中国石油天然气股份有限公司 | Preparation method of artificial core for simulating hydrate stratum skeleton in frozen soil area |
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