CN106370486A - Method for producing artificial rock core by using freezing drilling technology - Google Patents
Method for producing artificial rock core by using freezing drilling technology Download PDFInfo
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- CN106370486A CN106370486A CN201510439121.0A CN201510439121A CN106370486A CN 106370486 A CN106370486 A CN 106370486A CN 201510439121 A CN201510439121 A CN 201510439121A CN 106370486 A CN106370486 A CN 106370486A
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Abstract
The invention provides a method for producing an artificial rock core by using a freezing drilling technology. The method comprises: 1, designing a rock core model formula, and determining the ratios of quartz sands having different particle sizes to clay; 2, carrying out sand material filling and compacting; 3, freezing the compacted model, taking out, immediately carrying out liquid nitrogen rock core drilling, and freezing the rock core again; and 4, taking out the frozen rock core, encapsulating, pressurizing, and finally drying the sample so as to spare. According to the present invention, with the method, the research requirements in the oil reservoir seepage flow mechanism can be completely met, the advantages of various artificial rock core production methods in the prior art are summarized, and the main physical parameters of the oil reservoir rock can be completely simulated.
Description
Technical field
The present invention relates to oil field development technical field, especially relate to a kind of method drilling through fabrication techniques artificial core using freezing.
Background technology
Natural reservoir rockses have solid (glue) knot and loose two kinds of forms, and usual pore structure is more complicated, and hole inwall is relatively rough, the various clay mineral of filling, has up to a hundred microns of big pore throat, also has the little pore throat of one of not enough percentage micron, and permeability range is wide；The various composition of composition rock is complicated, contacts with crude oil and water for a long time, its wettability has hydrophilic, neutral and oleophylic, and is non-uniform wet, has the features such as mixing moistening, dalmatian wettability.
At present, the method for manual manufacture rock core is a lot, divides by core character and mainly has aluminum phosphate rock core, epoxy resin rock core, the artificial back-up sand rock core such as (or bead).First two is consolidated core, and rock core appearance is exposed, and processing technology has similarity；Artificial back-up sand rock core is loose core, relies on the fill out sand tube molding being enclosed within outside rock core.The feature of three-type-person's lithogenesis heart is different:
1st, aluminum phosphate rock core
Last century the seventies, Shengli Oil Field geology institute Tang Ren black horse et al. has invented phosphoric acid aluminium pattern, and publish an article " making of artificial areal model and research " the 6th phase " oil drilling technology " in 1985, processing technology and the application of phosphoric acid aluminium pattern are described in detail, this technology is applied for a patent (publication number is cn1587960 a) by Yang Huaijun etc. in 2004.Subsequently phosphoric acid aluminium pattern is continuously available development, successively has " sl-ii physical models of reservoir " (" petroleum journal " the 6th phase in 2003) of " making of gm synthetic core sample and research " (" compound oil gas field " the 3rd phase in 1994), the Wang Jian of Tang Renqi etc. etc..
Phosphoric acid aluminium pattern is the consolidated model through high temperature sintering, and pore surface is relatively rough, be amenable to High Temperature High Pressure, intrusive mercury curve relatively reservoir rockses etc., is its superior part compared with epoxy resin pattern；But the deficiency of its maximum is that under high temperature, clay property is lost seriously, and part fine pore is burned off.Model is due to through high temperature sintering, so initial wetting property is strong hydrophilicity.
2nd, epoxy resin rock core
Epoxy resin pattern is also to begin in field use such as grand celebration, triumpies in the 1970s and 1980s in last century, " quartz sand epoxide-resin agglutinated and preparation method thereof " of " making of hnt synthetic core sample and research " (" oil drilling technology " first phase in 1998) of Tang Renqi, Lu Xiangguo etc. (2005, publication number: cn1664547 a), " a kind of manufacture method of artificial rock core containing clay " (2006, publication number: cn100573092c) of ten thousand Jin Bin etc. be 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 adheres to the materials such as clay again, be a kind of rock core containing clay property, and this is its advantage more maximum than phosphoric acid aluminium pattern.But after epoxy resin solidification, surface is in glassy state, unusual light, some micro-pores also can be glued dead, also yielding under high temperature, high pressure；Epoxy resin is a kind of oleophilic substance simultaneously, and model initial wetting property is essentially oleophylic.
Patent cn100545625c and patent cn102757212 b fall within consolidated core, but do not disclose used which kind of cementing agent.
3rd, fill out sand tube rock core
The artificial back-up sand rock core such as (or bead) is applied also very early, and manufacture difficulty is minimum, using also extensive, is non-consolidated core.During making, varigrained sand material is added in fill out sand tube, by the continuous fill out sand tube that taps come vibrating compacting sand material, model can keep property and the grade composition of various clays.Its deficiency is mainly by being accomplished manually, workload is big, homogeneity within rock core is difficult to control to, the compaction of sand grains is limited, compared with reservoir rockses, the lower core permeability of similar particle sizes composition is higher, easily the migration of sand grains inside rock core during displacement, forms blocking of shaking out at displacement process outlet pipeline.
Appear rock core in addition with one kind, be to choose the distinctive natural rock in somewhere, core after exploitation large rock mass and obtain, belong to rock core rather than the artificial core of artificial.Its pore structure is similar to reservoir rockses, but its exploitation, cost of transportation are high, and physical property is naturally occurring, do not enable the design requirements such as specified particle size composition, clay component and content, and currently acquired appearing core permeability all ratios are relatively low, it is difficult to obtain the rock core that permeability is higher than 1000 millidarcies.
We have invented a kind of new method drilling through fabrication techniques artificial core using freezing for this, solve above technical problem.
Content of the invention
It is an object of the invention to provide a kind of Artificial Core Making method that can more comprehensively simulate the main physical property of reservoir rockses, for carrying out various flow through oil reservoir experiments, provide the method drilling through fabrication techniques artificial core using freezing of the model more like with the porous media properties of natural reservoir rockses.
The purpose of the present invention can be achieved by the following technical measures: the method drilling through fabrication techniques artificial core using freezing, this is included using the method that freezing drills through fabrication techniques artificial core: step 1, design core model formula, determines the ratio of different grain size quartz sand and clay；Step 2, carries out filling and the compacting of sand material；Step 3, the model pressing is freezed, then takes out and carry out immediately liquid nitrogen and drill through rock core, the rock core drilling through is freezed again；Step 4, the rock core drilling through in freezing is taken out, carries out encapsulating, pressurizes, finally by sample dry for standby.
The purpose of the present invention also can be achieved by the following technical measures:
In step 1, the physical parameter according to target reservoir, including granularmetric composition, clay component and content, to determine the ratio of different grain size quartz sand and clay, and to carry out wettability process according to the wettability characteristics of oil reservoir to quartz sand surface.
In step 2, the amount according to quartz sand and clay, adds suitable quantity of water by a certain percentage, is sufficiently stirred for, makes the somewhat moistening of sand material；Get out back-up sand mould, sand material is uniformly poured in mould, with hydraulic press, the sand material in mould is compacted.
In step 3, the model pressing is put in -70 DEG C of cryogenic refrigerator and freeze 24 hours, then take out and carry out immediately liquid nitrogen and drill through rock core, the rock core drilling through is placed in -70 DEG C of cryogenic refrigerators and freezes more than 4 hours.
In step 4, the rock core drilling through in freezing is taken out, the method that empirically loose samples are encapsulated in room, sheet lead encapsulating is carried out to rock core, and curable type of pressurizeing in core holding unit, it is then placed in baking oven, drying at 65 DEG C about more than 48 hours can be standby.
The method drilling through fabrication techniques artificial core using freezing in the present invention, its step includes: the design of core model formula, the filling in a mold of sand material and compacting, and the freezing of core model drills through, the encapsulating of rock core and drying etc..The method is according to the physical parameter of reservoir cores, such as granularity, clay content, permeability, porosity, pressure hydrargyrum hair are buckled line, wettability etc., to design sand material formula, the granularmetric composition of the rock core produced and clay content are close with reservoir rockses, intrusive mercury curve shows highly similar to natural reservoir cores, initial wetting property from hydrophilic to oleophylic, and can achieve mixing wetting state, and permeability range can be controlled in several millidarcies to more than millidarcies up to ten thousand.The method is easy to operate, fabrication cycle is short, in place of overcoming current artificial core some imperfections existing at aspects such as clay property, pore structure, wettability controls, the research needs of flow through oil reservoir mechanism aspect can more fully be met, combine various Artificial Core Making method advantages at present, the main physical parameter of comprehensive simulated reservoir rockses, have the advantages that clay property, pore structure be similar to oil reservoir, wettability meets that oil reservoir is actual, permeability range is big.Compared to prior art, the method have the advantages that
1. the method adopts freezing forming technique, completely remains the clay property in rock core；
2. without high temperature sintering, fine pore is completely retained, and the pore structure of intrusive mercury curve reflection is consistent with the actual reservoir rockses of same lithology；
3. the rock core initial wetting property that the method makes is strong hydrophilicity, is adjustable into the types such as slightly water-wet, neutrality, oleophylic, and can achieve mixing wetting state；
4., under same recipe, the model compaction that freezing boring method makes is bigger, and density is higher, and permeability can control lower, also reduces probability of shaking out in displacement test for the model simultaneously.
Brief description
Fig. 1 is the flow chart of the specific embodiment of method drilling through fabrication techniques artificial core using freezing of the present invention；
Fig. 2 is the intrusive mercury curve of the rock core produced in a specific embodiment of the present invention.
Specific embodiment
Above and other objects, features and advantages for enabling the present invention become apparent, cited below particularly go out preferred embodiment, and coordinate shown in accompanying drawing, be described in detail below.
As shown in figure 1, Fig. 1 is the flow chart of the method drilling through fabrication techniques artificial core using freezing of the present invention.
In step 101, design core model formula.This step according to the physical parameter of target reservoir, such as granularmetric composition, clay component and content, to determine the ratio of different grain size quartz sand and clay, and according to the wettability characteristics of oil reservoir, wettability process to be carried out to quartz sand surface.
In step 102, carry out filling and the compacting of sand material.Amount according to quartz sand and clay in this step, adds suitable quantity of water by a certain percentage, is sufficiently stirred for, makes the somewhat moistening of sand material.Get out back-up sand mould, sand material is uniformly poured in mould, with hydraulic press, the sand material in mould is compacted.
In step 103, carry out the freezing of model and drill through.In this step, the model pressing is put into freezing in cryogenic refrigerator, then take out and carry out immediately liquid nitrogen and drill through rock core, the rock core getting out is placed into freezing in cryogenic refrigerator.
In step 104, by rock core encapsulating and drying.The rock core drilling through is taken out from cryogenic refrigerator, empirically the method for room encapsulating loose samples carries out encapsulating, pressurizes, and finally sample is put into oven for drying standby.
In a specific embodiment of the application present invention, comprise the steps that
1) formula design
As a example formula listed by table 1 below, weigh quartz sand and the clay of different grain groups in proportion, and as needed part quartz sand surface is carried out wettability process, can reach mixing wetting effect.
Table 1 quartz sand and clay ratios formula
2) filling compacting
The mould of 30cm × 30cm × 12cm is first ready on hydraulic pressure machine platform, the sand material mix homogeneously that will weigh, and add appropriate water (sand material can be agglomerating with holding).Weigh a certain amount of sand material to pour in mould, stir, cover briquetting, with hydraulic press, briquetting is depressed, make model reach design thickness.
3) freezing drills through
The model pressing is removed from the molds, freezes 24 hours in the cryogenic refrigerator carefully moving into -70 DEG C, then do circulation fluid with liquid nitrogen and drill through rock core, place in -70 DEG C of cryogenic refrigerators and freeze more than 4 hours.
4) encapsulating is dried
The rock core having frozen is taken out from refrigerator, the method that empirically loose samples are encapsulated in room, sheet lead encapsulating is carried out to rock core, and curable type of pressurizeing in core holding unit, it is then placed in baking oven, drying at 65 DEG C about more than 48 hours can be standby.
Fig. 2 is the intrusive mercury curve of the rock core produced, and table 2 is its characteristic parameter.
The surveyed rock core characteristic parameter of table 2
The foregoing is only presently preferred embodiments of the present invention, be not used to limit the scope of the claims of the present invention, other use the equivalence changes of the patent spirit of the present invention, all should all belong to the scope of the claims of the present invention.
Claims (5)
1. drill through the method for fabrication techniques artificial core it is characterised in that this is included using the method that freezing drills through fabrication techniques artificial core using freezing:
Step 1, designs core model formula, determines the ratio of different grain size quartz sand and clay；
Step 2, carries out filling and the compacting of sand material；
Step 3, the model pressing is freezed, then takes out and carry out immediately liquid nitrogen and drill through rock core, the rock core drilling through is freezed again；
Step 4, the rock core drilling through in freezing is taken out, carries out encapsulating, pressurizes, finally by sample dry for standby.
2. the method drilling through fabrication techniques artificial core using freezing according to claim 1, it is characterized in that, in step 1, physical parameter according to target reservoir, including granularmetric composition, clay component and content, to determine the ratio of different grain size quartz sand and clay, and according to the wettability characteristics of oil reservoir, wettability process to be carried out to quartz sand surface.
3. the method drilling through fabrication techniques artificial core using freezing according to claim 1 it is characterised in that in step 2, according to the amount of quartz sand and clay, adds suitable quantity of water by a certain percentage, is sufficiently stirred for, makes the somewhat moistening of sand material；Get out back-up sand mould, sand material is uniformly poured in mould, with hydraulic press, the sand material in mould is compacted.
4. the method drilling through fabrication techniques artificial core using freezing according to claim 1, it is characterized in that, in step 3, the model pressing is put in -70 DEG C of cryogenic refrigerator and freeze 24 hours, then take out and carry out immediately liquid nitrogen and drill through rock core, the rock core drilling through is placed in -70 DEG C of cryogenic refrigerators and freezes more than 4 hours.
5. the method drilling through fabrication techniques artificial core using freezing according to claim 1, it is characterized in that, in step 4, the rock core drilling through in freezing is taken out, the method that empirically loose samples are encapsulated in room, carries out sheet lead encapsulating to rock core, and curable type of pressurizeing in core holding unit, it is then placed in baking oven, drying at 65 DEG C about more than 48 hours can be standby.
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Cited By (3)
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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 |
| CN109443886A (en) * | 2019-01-15 | 2019-03-08 | 中国石油大学(华东) | A kind of simulation core production method for determining pore throat and particle surface properties |
| CN114002123A (en) * | 2021-10-29 | 2022-02-01 | 中国海洋石油集团有限公司 | Loose low-permeability sandstone particle migration experiment method |
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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 |
| CN109443886A (en) * | 2019-01-15 | 2019-03-08 | 中国石油大学(华东) | A kind of simulation core production method for determining pore throat and particle surface properties |
| CN114002123A (en) * | 2021-10-29 | 2022-02-01 | 中国海洋石油集团有限公司 | Loose low-permeability sandstone particle migration experiment method |
| 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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