CN109372458A - Rich oil loose sand standard core column freezes coring method and core taking fixture - Google Patents

Rich oil loose sand standard core column freezes coring method and core taking fixture Download PDF

Info

Publication number
CN109372458A
CN109372458A CN201811311041.7A CN201811311041A CN109372458A CN 109372458 A CN109372458 A CN 109372458A CN 201811311041 A CN201811311041 A CN 201811311041A CN 109372458 A CN109372458 A CN 109372458A
Authority
CN
China
Prior art keywords
rich oil
loose sand
core
rock sample
small size
Prior art date
Application number
CN201811311041.7A
Other languages
Chinese (zh)
Inventor
张小军
吴梁宇
张世铭
王朴
王超
苟迎春
俞晓峰
Original Assignee
中国石油天然气股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国石油天然气股份有限公司 filed Critical 中国石油天然气股份有限公司
Priority to CN201811311041.7A priority Critical patent/CN109372458A/en
Publication of CN109372458A publication Critical patent/CN109372458A/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • E21B25/08Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/04Devices for withdrawing samples in the solid state, e.g. by cutting
    • G01N1/08Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/04Devices for withdrawing samples in the solid state, e.g. by cutting
    • G01N1/08Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
    • G01N2001/085Grabs

Abstract

The present invention is that a kind of rich oil loose sand standard core column freezes coring method and core taking fixture, this method include, full scene drills through the diameter core of rich oil loose sand, carries out freezing solid with after the full diameter core of envelope with adopting;Full diameter core low temperature cutting after freezing is formed into small size rock sample, it is deep to freeze processing small size rock sample;Small size rock sample after fixed deep jelly forms rich oil loose sand standard core column using the outer wall of drilling machine drilling small size rock sample, and rich oil loose sand standard core column is carried out pressure control encapsulating and is saved.Sampling process is with adopting with envelope in this method, full diameter core after freezing is broken the whole up into parts and fritter freezes deeply, with the use of novel core taking fixture, this method can successfully drill through rich oil loose sand standard core column, meet a variety of analysis testing requirements of rich oil loose sand, ensure that the integralities of all kinds of test datas of rich oil loose sand with it is comprehensive, tap the latent power for the adjustment of high water cut stage oilfield development program and measure and provide sound assurance.

Description

Rich oil loose sand standard core column freezes coring method and core taking fixture

Technical field

The present invention relates to technical field of geological exploration more particularly to a kind of rich oil loose sand standard core column to freeze coring Method and core taking fixture.

Background technique

Most domestic waterflooding oil field comes into high water cut stage at present, and development plan adjustment and measure tap the latent power and be The main task of mid-late oilfield development reservoir management, the analysis test for reservoir, fluid show important especially.Standard core column (the core column that standard core column refers to 1 inch and 1.5 inch diameters) can be used for a variety of geological experiments, seep commonly used in hole, pressure Mercury, five quick, mutually the kinds of experiments such as infiltration, displacement, stress sensitive are tested, from the rock of acquisition as former state to standard core column, just from Do not spud in machine drill core, and rich oil loose sand is a kind of very special lithology type, its quality is loose, is rich in oil gas, part The also washing of development zone oil reservoir is serious, cannot keep an intergranular texture substantially, can easily peel off and scatter, and seems forming, actually upper hand It is i.e. broken, it is difficult cutting and drills through.

Currently, the core column of loose sand, which is drilled through, drills through technique using different, it is generally divided into two ways: the wet brill of water cooling With air cooling drilled dry, more special technique is exactly using the technology of freezing and the cooling drill core of liquid nitrogen, and this technology is for general Loose sand rock sample core taking be able to satisfy substantially.But as a kind of very special lithology-rich oil loose sand and for a long time It is serious to be in the washing of development zone oil reservoir, using current existing freezing core-taking technology, sample is unable to satisfy drill core requirement substantially, or The probability of person's failure is very high, almost without successful possibility in drilling operation.

Conventional freezing coring method is using techniqueflow as sampling-freezen protective-brill sample-encapsulating, still This process is but not suitable for (or perhaps not enough) to rich oil loose sand rock sample.Also, conventional freezing coring method is neglected Depending on the preservation of oil, gas and water in rock sample, it can not also solve the problems, such as that sample melts and is crushed during drill core.Conventional is cold Particular problem when freezing coring method acquisition rich oil loose sand rock sample is as follows:

(1) rich oil loose sand is known that rich accumulation of oil and gas in rock sample, water drop test are substantially impermeable from name.With subzero 18 After degree Celsius stored refrigerated, through 4 hours of liquid nitrogen frozen, moisture can be freezed very solid, but oil gas but can not be cold Freeze the intensity to ice, so the High oleic effect for greatly reducing freezing, reduces the robustness of monolith rock sample.In addition rock sample is again By long-term water logging, cementing difference itself is in rarefaction, more increases the difficulty of firm sample in this way.

(2) for rich oil loose sand due to the oil included and the moisture retained, the rock sample humidity made is larger, bores in drill bit During cutting, bores the rock debris to get off viscosity under the action of grease and increase, be not easy to produce by boasting from drill bit and cause to bore Head congestion, the clast of congestion increases the frictional force between drill bit and core column, in drill bit when running at high speed, this frictional force Becoming the torsion acted on core column, the presence of this torsion makes core column be very easy to be twisted off during drill core, Cause the failure of coring.

(3) drill bit Yu the core friction of drill bit high-speed rotation in core-drilling column generate high fever, and make the oil in rock sample Water dissolution, the grease of dissolution make the viscosity of rock sample clast become larger again, are less useful for the peeling for the clast that drilling is got off and make drill bit Inside and outside landwaste causes congestion, and the landwaste of congestion has completely cut off distributing for heat on drill bit, has also completely cut off liquid nitrogen to bit operation portion The cooling of position, the heat for generating friction can not be quickly cooled down, more act on core column, melt the grease inside rock sample constantly Change, the support force between loose sand particle is lost, and becomes soft and deformed, sposh phenomenon is more serious, integrally destroys rock sample knot Structure keeps rock sample broken, can not drill through standard core column.

(4) rock sample in drill core is fixed to clamp on drilling through frame with fixture, and this fixture is also to the extruding force of rock sample It is very big, it is also a kind of destructive power for this rock sample inadequate to set strength, is generated when being operated along with drilling bit high-speed Vibration inevitably acts on rock sample, under the pincer attack of this interior external force, in itself it is cementing with regard to untight rock sample just very It is easy to be shattered, required core column can not be drilled out.

The present inventor based on years of experience and practice in relevant industries, proposes a kind of rich oil loose sand mark as a result, Quasi- core column freezing coring method and core taking fixture, to overcome the deficiencies of existing technologies.

Summary of the invention

The purpose of the present invention is to provide a kind of rich oil loose sand standard core columns to freeze coring method and core taking fixture, Overcome problems of the prior art, this method can successfully drill through rich oil loose sand standard core column, meet rich oil and dredge The a variety of analysis testing requirements of fluffing of moulding sand rock, ensure that the integralities of all kinds of test datas of rich oil loose sand with it is comprehensive, contain for height The adjustment of water stage oilfield development program and measure tap the latent power and provide sound assurance.

The object of the present invention is achieved like this, a kind of rich oil loose sand standard core column freezing coring method, including, Scene drills through the full diameter core of rich oil loose sand, carries out freezing solid with after the full diameter core of envelope with adopting;After freezing Full diameter core low temperature cutting forms small size rock sample, deep to freeze processing small size rock sample;Small size rock sample after fixed deep jelly, makes Rich oil loose sand standard core column is formed with the outer wall of drilling machine drilling small size rock sample, by rich oil loose sand standard core column Pressure control encapsulating is carried out to save.

In a preferred embodiment of the present invention, the rich oil loose sand standard core column freezes coring method, Specifically includes the following steps:

Step a, scene drills through the full diameter core of rich oil loose sand, at once wraps up full diameter core with masking foil close Envelope, masking foil outside carry out absorbent cotton cloth environmental sealing, the full diameter core after package are integrally sealed with wax later, completes full diameter Core is with adopting with envelope;

Step b, the full diameter core after sealing with wax is rapidly feeding refrigerator freezing solid, the full diameter core refrigeration after freezing It saves;

Step c, the outer layer encapsulating for removing full diameter core, carries out liquid nitrogen cryogenics cutting for the full diameter core after freezing, Multiple small size rock samples are formed, by the processing of small size rock sample depth jelly;

Step d, using the fixed small size rock sample of core taking fixture, the outer wall for starting drilling machine drilling small size rock sample forms rich oil Loose sand standard core column, it is cooling using liquid nitrogen when drilling through;

Step e, rich oil loose sand standard core column is put into the envelope of axial ends opening, in the loose sand of rich oil The axial ends setting of rock standard core column is anti-to slip through the net, and is squeezed out using plastic packaging machine to the pressurization of rich oil loose sand standard core column Air, envelope compression fit on the outer wall of rich oil loose sand standard core column.

In a preferred embodiment of the present invention, it in step a, after full diameter core package degreasing cotton sealing, carries out Rock sample information labeling, full diameter core of integrally sealing with wax after mark.

In a preferred embodiment of the present invention, in step b, the cryogenic temperature range of refrigerator is -24 DEG C~-18 DEG C; The complete stored refrigerated temperature of diameter core after freezing is -37 DEG C.

In a preferred embodiment of the present invention, in step c, the height dimension of small size rock sample is 6cm~10cm's Square column structure, the cross section of square column structure are that side length is 3cm or the square of 4cm.

In a preferred embodiment of the present invention, in step c, small size rock sample immerse liquid nitrogen deeply freeze processing 20 minutes~ 40 minutes.

In a preferred embodiment of the present invention, in step d, the drill bit of drilling machine repairs the outer wall drilling of small size rock sample Circle, liquid nitrogen acts on the cooling drill bit of bit face and small size rock sample simultaneously for drill bit drilling.

In a preferred embodiment of the present invention, in step e, with cutting machine shaping rich oil loose sand standard core Column, the initial data of measurement record rich oil loose sand standard core column.

In a preferred embodiment of the present invention, in step e, envelope is lead pipe or thermoplastic tube, envelope it is outer Sampled data is engraved on wall;Anti- slip through the net is slipped through the net for stainless steel is anti-, and the anti-mesh number slipped through the net is 80 mesh.

The purpose of the present invention can also be achieved, and make in a kind of rich oil loose sand standard core column freezing coring method Core taking fixture, the core taking fixture include the chuck body being capable of fixing below the drill bit of drilling machine, in the chuck body The locating notch that fixed small size rock sample can be plugged is set.

From the above mentioned, rich oil loose sand standard core column freezing coring method provided by the invention and core taking fixture have It is following the utility model has the advantages that

In rich oil loose sand standard core column freezing coring method of the invention, to the full diameter rock of rich oil loose sand Core avoids later grease being analyzed and taken standard with the oil for preventing rock sample with envelope, water constituent evaporation dissipation and disintegration of core is adopted Core link adversely affects;Full diameter core low temperature cutting after freezing carries out deep jelly processing at small size rock sample again, " changes whole It is zero and fritter jelly deeply ", rock sample freezing is more thoroughly firmer, consolidates rock sample structure more stable;Drilling machine drilling small size rock The outer wall of sample forms rich oil loose sand standard core column, and the power of drilling rotation directly acts on the outer wall of small size rock sample, and It will not act on inside core column, greatly reduce the twisting force that core column itself is subject to, avoid coring from failing, and reduce Talus deposit avoids generation high fever from dissolving the grease of rock sample, avoids influencing raising while rich oil loose sand rock sample characteristic Coring success rate;The core taking fixture used in rich oil loose sand standard core column freezing coring method of the invention, insertion are held It sets fixed form and provides the fixed stably condition worked as small size rock sample, avoid rock sample by fixture attrition crushing;Richness of the invention Oily loose sand standard core column freezing coring method can successfully drill through rich oil loose sand standard core column, thoroughly solve Rich oil, this kind of special rock samples of the serious loose sand of washing drill through the problem of standard core, test subsequent items To go on smoothly, breach original oil zone Water Flooding Layer reservoir, fluid be unable to system testing evaluation bottleneck, meet rich oil loose sand A variety of analysis testing requirements, ensure that the integralities of all kinds of test datas of rich oil loose sand with it is comprehensive, be high water cut stage Oilfield development program adjustment and measure tap the latent power and carry out reservoir, fluid system experiment provide sound assurance.

Detailed description of the invention

The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:

Fig. 1: it is freezed in coring method for rich oil loose sand standard core column of the invention and drills through rich oil loose sand mark The status diagram of quasi- core column.

Fig. 2: showing for core taking fixture used in coring method is freezed for rich oil loose sand standard core column of the invention It is intended to.

In figure:

100, core taking fixture;

1, chuck body;11, locating notch;

8, small size rock sample;

9, drill bit.

Specific embodiment

For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed Bright specific embodiment.

The present invention provides a kind of rich oil loose sand standard core column freezing coring method, comprising: scene drills through rich oil and dredges The full diameter core of fluffing of moulding sand rock carries out freezing solid with after the full diameter core of envelope with adopting;By the full diameter core low temperature after freezing Cutting forms small size rock sample, deep to freeze processing small size rock sample;Small size rock sample after fixed deep jelly, uses the small ruler of drilling machine drilling The outer wall of very little rock sample forms rich oil loose sand standard core column, and rich oil loose sand standard core column is carried out pressure control encapsulating and is protected It deposits.

In rich oil loose sand standard core column freezing coring method of the invention, to the full diameter rock of rich oil loose sand Core avoids later grease being analyzed and taken standard with the oil for preventing rock sample with envelope, water constituent evaporation dissipation and disintegration of core is adopted Core link adversely affects;Full diameter core low temperature cutting after freezing carries out deep jelly processing at small size rock sample again, " changes whole It is zero and fritter jelly deeply ", rock sample freezing is more thoroughly firmer, consolidates rock sample structure more stable;Drilling machine drilling small size rock The outer wall of sample forms rich oil loose sand standard core column, and the power of drilling rotation directly acts on the outer wall of small size rock sample, and It will not act on inside core column, greatly reduce the twisting force that core column itself is subject to, avoid coring from failing, and reduce Talus deposit avoids generation high fever from dissolving the grease of rock sample, avoids influencing raising while rich oil loose sand rock sample characteristic Coring success rate;Rich oil loose sand standard core column freezing coring method of the invention can successfully drill through rich oil loose sand Standard core column, thoroughly solve rich oil, this kind of special rock samples of the serious loose sand of washing drill through the difficulty of standard core Topic keeps subsequent every test smooth, breaches original oil zone Water Flooding Layer reservoir, fluid is unable to system testing evaluation Bottleneck meets a variety of analysis testing requirements of rich oil loose sand, ensure that the integrality of all kinds of test datas of rich oil loose sand With it is comprehensive, for high water cut stage oilfield development program adjustment and measure tap the latent power and provide sound assurance.

Further, rich oil loose sand standard core column of the invention freezes coring method, specifically includes the following steps:

Step a, scene drills through the full diameter core of rich oil loose sand, at once wraps up full diameter core with masking foil close Envelope, it is desirable that the sealing full diameter core of monolith makes full diameter core and external thoroughly isolation;Absorbent cotton cloth bag is carried out on the outside of masking foil Sealing is wrapped up in, the axial ends of full diameter core is tightened with rope;The full diameter core after package is integrally sealed with wax later, it is desirable that will Full diameter core monolith after package immerses in wax, cannot have leakage to seal;Full diameter core is completed with adopting with envelope, cannot for a long time by Full diameter core exposure is in air.The above operation can referred to as " encapsulating of full diameter core scene three-step approach ".

Wherein, after full diameter core package degreasing cotton sealing, rock sample information labeling is carried out, is integrally sealed with wax after mark complete straight Diameter core, in order to experimental record.

" encapsulating of full diameter core scene three-step approach " realizes that the full diameter core to rich oil loose sand with adopting with envelope, prevents Oil, water constituent evaporation dissipation and the disintegration of core of rock sample, avoid to later grease analysis and standard core link are taken to cause not Benefit influences.

Step b, the full diameter core after sealing with wax is rapidly feeding refrigerator freezing solid, the full diameter core refrigeration after freezing It saves;

Wherein, the cryogenic temperature range of refrigerator be -24 DEG C~-18 DEG C (temperature range can carry out according to actual needs Adjustment), it is desirable that refrigerator opens 30 minutes (pre-coo time can be adjusted according to actual needs) of pre-cooling, full diameter rock in advance The time that core freezes in refrigerator is 2~4 hours;When multiple full diameter cores are put into refrigerator, it is desirable that it is whole according to rock sample information It full cries and is placed in refrigerator.

The encapsulating and full diameter core after freezing answers fast transportation to refrigerate into refrigerator, the storage temperature of refrigerator is- 37 DEG C (temperature can be adjusted according to actual needs), oil, water or other fluid is delayed to scatter and disappear, stress release.

The step can become " core quickly seamless cold chain processing ", and the links such as technique, transport, time and temperature are wanted Ask higher more careful.

Step c, full diameter core is taken out from refrigerator, the outer layer encapsulating of full diameter core is removed, after freezing Full diameter core carries out liquid nitrogen cryogenics cutting (being cut using the rock cutter with liquid nitrogen), forms multiple small size rock samples (wherein, small size refers to that relatively full diameter core size is smaller), by the processing of small size rock sample depth jelly;

Wherein, the height dimension of small size rock sample is the square column structure of 6cm~10cm, and the cross section of square column structure is side length For the square of 3cm or 4cm, each small size rock sample is marked.

Small size rock sample immerses liquid nitrogen and freezes processing 20 minutes~40 minutes deeply, in a specific embodiment of the invention, leaching Entering the time frozen deeply in liquid nitrogen is 30 minutes.

Full diameter core low temperature cutting after freezing carries out deep jelly processing at small size rock sample again, " breaks the whole up into parts and fritter It is deep to freeze ", rock sample freezing is more thoroughly firmer, consolidates rock sample structure more stable.

Step d, as shown in Figure 1, starting drilling machine (prior art) using the fixed small size rock sample 8 of core taking fixture 100 and drilling through The progressive velocity-stabilization of range request drilling machine is crossed in rich oil loose sand standard core column, drilling, and bit vibration amplitude is small as far as possible, avoids Extraneous factor causes rock sample broken;Cooling using liquid nitrogen when drilling through, the heat for generating drill bit friction rock sample is cooled quickly, rock Stem eliminates the danger being melted;

Wherein, the drill bit 9 (prior art, general to use 1 inch or 1.5 inch drill bits) of drilling machine is to the outer of small size rock sample Wall drilling cavetto, liquid nitrogen acts on the cooling drill bit of bit face simultaneously and small size rock sample, liquid nitrogen directly act on for drill bit drilling Bit face acts directly on coolant on drill bit and rock sample, maintains and strengthens the refrigerating structure of rock sample, obtain drilling The configuration of cylindrical rich oil loose sand standard core column retained.

Drill bit directly carries out drilling cavetto to small size rock sample outer wall, and the power of drilling rotation directly acts on small size rock sample Outer wall, crush the sand mud clast to get off and become scattered about rig operations platform bottom quickly, it is more than needed to being provided between drill bit and rock sample Space, clast will not congestion inside and outside drill bit, avoid silt particle congestion and increase friction torsion between drill bit and rock sample, simultaneously Also the not lost phenomenon of drill bit heat of sand mud clast congestion appearance has been evaded.

The outer wall of drilling machine drilling small size rock sample forms rich oil loose sand standard core column, and the power of drilling rotation is directly made For the outer wall of small size rock sample, without acting on inside core column, greatly reduces the torsion that core column itself is subject to and make With avoiding coring from failing, and reduce talus deposit, avoiding generating high fever dissolve the grease of rock sample, avoids influencing rich oil thin Coring success rate is improved while fluffing of moulding sand rock rock sample characteristic.

Step e, rich oil loose sand standard core column is put into the envelope of axial ends opening, in the loose sand of rich oil The axial ends setting of rock standard core column is anti-to slip through the net, and is squeezed out using plastic packaging machine to the pressurization of rich oil loose sand standard core column Air, envelope compression fit on the outer wall of rich oil loose sand standard core column.

Wherein, with cutting machine (prior art) shaping rich oil loose sand standard core column, rich oil is dredged on cutting machine The axial ends of fluffing of moulding sand rock standard core column is cut flat with, the measurement record length of rich oil loose sand standard core column, diameter and again The initial data such as amount, and original data record is spare in table.

It requires to encapsulate on rich oil loose sand standard core column according to different test items, wherein envelope can Think lead pipe or thermoplastic tube, prevents slipping through the net in the axial ends setting of rich oil loose sand standard core column, anti-slip through the net is stainless Steel is anti-to slip through the net, and the anti-mesh number slipped through the net is 80 mesh;Pressurize 2.4MPa in plastic packaging machine, squeezes to the pressurization of rich oil loose sand standard core column Air is extruded, the outer wall of envelope and rich oil loose sand standard core column fits closely, and plays fixed rich oil loose sand mark The effect of quasi- core column endoparticle structure prevents loose rich oil loose sand to be crushed in washing oil or test process;It is encapsulating Sampled data (the hard nail that tip can be used engraves) is engraved on the outer wall of skin, in case later experiments sampling uses.

Rich oil loose sand standard core column freezing coring method of the invention can successfully drill through rich oil loose sand mark Quasi- core column, solves in conventional freezing drill core method that sample saves, drilling machine fever is melted rock sample, shatter sample, core column and dredged The a series of technical problems such as pine is broken, solve Water Flooding Layer pore Structure Analysis, Rock Mechanics Analysis, analysis of characteristics of seepage, The analysis projects such as Analysis of displacement efficiency, rock electrical feature are made loose sand class reservoir, fluid experiment by the problem of sample preparation limitation of the technology Systematic development is possibly realized.

The present invention provides core taking fixture 100 used in a kind of rich oil loose sand standard core column freezing coring method, As shown in Fig. 2, core taking fixture 100 includes the chuck body 1 being capable of fixing below the drill bit 9 of drilling machine, energy is set in chuck body 1 The locating notch 11 of fixed small size rock sample is plugged, the size of locating notch 11 carries out true according to the small size rock sample to be processed It is fixed.

As shown in Figure 1, during drilling small size rock sample forms rich oil loose sand standard core column, by small size Rock sample is inserted into locating notch 11, and chuck body 1 is fixed on the operating platform of drilling machine, it is desirable that the drill bit 9 of drilling machine is in small The surface of size rock sample, positioning cannot deviate.The height of the chuck body 1 of core taking fixture 100 is 2~3mm.In this hair In a bright specific embodiment, the structure size of chuck body 1 is 10cm*8cm*3cm.

Small size rock sample is inserted into core taking fixture 100 and fixes, and avoids existing fixture to the extruding force of rock sample, avoids rock sample It is crushed.As long as core taking fixture 100 provides the fixed stably condition worked as small size rock sample, do not need to increase extruding fixation Strength avoids rock sample by fixture attrition crushing.

Freezing coring method of the invention is technically unprecedented in drilling through for rich oil loose sand standard core column Innovation, rich oil loose sand rich oil, washing is serious and rock core is loose, seems forming, and actually upper hand, that is, broken, cutting drills through feasibility Difference, this method is not only refined in sampling early period, Refrigeration Technique, and is improved process flow is drilled through, and is adopted The mode of " break the whole up into parts and fritter freezes deeply " is taken, and using the mold of innovative design, overcomes and drills through rich oil loose sand standard The problem of heat present in core column technique and frictional force, ensure that core column drilling operation rock sample refrigerating structure and robustness Be not destroyed, solve the problems, such as rich oil, the serious loose sand of washing drill through standard core column, this method is bored from sampling Extract operation requirement is more accurate, and it is higher more careful to require in the control of the links such as technique, time, transport and temperature;This hair It is serious loose that bright rich oil loose sand standard core column freezing coring method is suitable for institute's rich oil in need, washing both at home and abroad Sandstone drills through the sample preparation field of standard core column, it evaded conventional freezing coring there are the problem of, thoroughly solve rich oil dredge Fluffing of moulding sand rock drills through the problem of standard core column.Meanwhile with the core taking fixture for the process and design for increasing cutting small size rock sample Under effect, inexpensive solves drilling through for rich oil loose sand standard core column, and entire sample making course is at home and abroad also exhausted Without only, technical method is in first place in the world.

From the above mentioned, rich oil loose sand standard core column freezing coring method provided by the invention and core taking fixture have It is following the utility model has the advantages that

In rich oil loose sand standard core column freezing coring method of the invention, to the full diameter rock of rich oil loose sand Core avoids later grease being analyzed and taken standard with the oil for preventing rock sample with envelope, water constituent evaporation dissipation and disintegration of core is adopted Core link adversely affects;Full diameter core low temperature cutting after freezing carries out deep jelly processing at small size rock sample again, " changes whole It is zero and fritter jelly deeply ", rock sample freezing is more thoroughly firmer, consolidates rock sample structure more stable;Drilling machine drilling small size rock The outer wall of sample forms rich oil loose sand standard core column, and the power of drilling rotation directly acts on the outer wall of small size rock sample, and It will not act on inside core column, greatly reduce the twisting force that core column itself is subject to, avoid coring from failing, and reduce Talus deposit avoids generation high fever from dissolving the grease of rock sample, avoids influencing raising while rich oil loose sand rock sample characteristic Coring success rate;The core taking fixture used in rich oil loose sand standard core column freezing coring method of the invention, insertion are inserted If fixed form provides the fixed stably condition worked as small size rock sample, rock sample is avoided by fixture attrition crushing;Richness of the invention Oily loose sand standard core column freezing coring method can successfully drill through rich oil loose sand standard core column, thoroughly solve Rich oil, this kind of special rock samples of the serious loose sand of washing drill through the problem of standard core, test subsequent items To go on smoothly, breach original oil zone Water Flooding Layer reservoir, fluid be unable to system testing evaluation bottleneck, meet rich oil loose sand A variety of analysis testing requirements, ensure that the integralities of all kinds of test datas of rich oil loose sand with it is comprehensive, be high water cut stage Oilfield development program adjustment and measure tap the latent power and carry out reservoir, fluid system experiment provide sound assurance.

The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is any Those skilled in the art, made equivalent changes and modifications under the premise of not departing from design and the principle of the present invention, It should belong to the scope of protection of the invention.

Claims (10)

1. a kind of rich oil loose sand standard core column freezes coring method, which is characterized in that including it is loose that scene drills through rich oil The full diameter core of sandstone carries out freezing solid with after the full diameter core of envelope with adopting;Full diameter core low temperature after freezing is cutd open It cuts to form small size rock sample, it is deep to freeze processing small size rock sample;Small size rock sample after fixed deep jelly, uses drilling machine drilling small size The outer wall of rock sample forms rich oil loose sand standard core column, and rich oil loose sand standard core column is carried out pressure control encapsulating and is protected It deposits.
2. rich oil loose sand standard core column as described in claim 1 freezes coring method, which is characterized in that specifically include Following steps:
Step a, scene drills through the full diameter core of rich oil loose sand, at once by full diameter core masking foil environmental sealing, Absorbent cotton cloth environmental sealing is carried out on the outside of masking foil, and the full diameter core after package is integrally sealed with wax later, completes full diameter rock Core is with adopting with envelope;
Step b, the full diameter core after sealing with wax is rapidly feeding refrigerator freezing solid, and the full diameter core after freezing, which refrigerates, to be protected It deposits;
Step c, the outer layer encapsulating for removing full diameter core, carries out liquid nitrogen cryogenics cutting for the full diameter core after freezing, is formed Multiple small size rock samples, by the processing of small size rock sample depth jelly;
Step d, using the fixed small size rock sample of core taking fixture, the outer wall formation rich oil for starting drilling machine drilling small size rock sample is loose Sandstone standard core column, it is cooling using liquid nitrogen when drilling through;
Step e, rich oil loose sand standard core column is put into the envelope of axial ends opening, in rich oil loose sand mark The axial ends setting of quasi- core column is anti-to slip through the net, and squeezes out sky to the pressurization of rich oil loose sand standard core column using plastic packaging machine Gas, envelope compression fit on the outer wall of rich oil loose sand standard core column.
3. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step a, After full diameter core package degreasing cotton sealing, rock sample information labeling is carried out, full diameter core of integrally sealing with wax after mark.
4. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step b, The cryogenic temperature range of refrigerator is -24 DEG C~-18 DEG C;The complete stored refrigerated temperature of diameter core after freezing is -37 DEG C.
5. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step c, The height dimension of small size rock sample is the square column structure of 6cm~10cm, and the cross section of square column structure is that side length is 3cm or 4cm Square.
6. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step c, Small size rock sample immerses liquid nitrogen and freezes processing 20 minutes~40 minutes deeply.
7. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step d, The drill bit of drilling machine to the outer wall drilling cavetto of small size rock sample, drill bit drilling simultaneously liquid nitrogen act on the cooling drill bit of bit face and Small size rock sample.
8. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step e, With cutting machine shaping rich oil loose sand standard core column, the initial data of measurement record rich oil loose sand standard core column.
9. rich oil loose sand standard core column as claimed in claim 2 freezes coring method, which is characterized in that in step e, Envelope is lead pipe or thermoplastic tube, engraves sampled data on the outer wall of envelope;Anti- slip through the net is slipped through the net for stainless steel is anti-, anti-to slip through the net Mesh number be 80 mesh.
10. being used in a kind of rich oil loose sand standard core column freezing coring method as described in any one of claim 1 to 9 Core taking fixture, which is characterized in that the core taking fixture includes the chuck body being capable of fixing below the drill bit of drilling machine, the folder Setting can plug the locating notch of fixed small size rock sample on tool ontology.
CN201811311041.7A 2018-11-06 2018-11-06 Rich oil loose sand standard core column freezes coring method and core taking fixture CN109372458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811311041.7A CN109372458A (en) 2018-11-06 2018-11-06 Rich oil loose sand standard core column freezes coring method and core taking fixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811311041.7A CN109372458A (en) 2018-11-06 2018-11-06 Rich oil loose sand standard core column freezes coring method and core taking fixture

Publications (1)

Publication Number Publication Date
CN109372458A true CN109372458A (en) 2019-02-22

Family

ID=65397187

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811311041.7A CN109372458A (en) 2018-11-06 2018-11-06 Rich oil loose sand standard core column freezes coring method and core taking fixture

Country Status (1)

Country Link
CN (1) CN109372458A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD139979A3 (en) * 1977-08-25 1980-02-06 Gerd Rosenberg Device for removing floor samples in the dry drilling process, especially for non-bonding locker sediments on ground-water-influenced boedes
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 unconsolidated formation damage evaluation and manufacturing method of artificial rock core
CN204758377U (en) * 2015-06-16 2015-11-11 青岛海洋地质研究所 Core sample mixing stirring device who contains methane hydrate
CN106248555A (en) * 2016-09-09 2016-12-21 中国石油大学(华东) A kind of clamper measuring full-hole core permeability anisotropy
CN206972183U (en) * 2017-06-27 2018-02-06 陕西延长石油(集团)有限责任公司研究院 A kind of sealing device for viscous crude loose sand sample washing oil
CN107957360A (en) * 2017-10-11 2018-04-24 中国石油天然气股份有限公司 The live method of seal of particulate rock rock core and live mothballed plant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD139979A3 (en) * 1977-08-25 1980-02-06 Gerd Rosenberg Device for removing floor samples in the dry drilling process, especially for non-bonding locker sediments on ground-water-influenced boedes
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 unconsolidated formation damage evaluation and manufacturing method of artificial rock core
CN204758377U (en) * 2015-06-16 2015-11-11 青岛海洋地质研究所 Core sample mixing stirring device who contains methane hydrate
CN106248555A (en) * 2016-09-09 2016-12-21 中国石油大学(华东) A kind of clamper measuring full-hole core permeability anisotropy
CN206972183U (en) * 2017-06-27 2018-02-06 陕西延长石油(集团)有限责任公司研究院 A kind of sealing device for viscous crude loose sand sample washing oil
CN107957360A (en) * 2017-10-11 2018-04-24 中国石油天然气股份有限公司 The live method of seal of particulate rock rock core and live mothballed plant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张学友: "疏松砂岩物性参数应力敏感性实验研究", 《全国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 *

Similar Documents

Publication Publication Date Title
US6380138B1 (en) Injection molded degradable casing perforation ball sealers fluid loss additive and method of use
US1342780A (en) Method and apparatus for shutting water out of oil-wells
US5103911A (en) Method and apparatus for perforating a well liner and for fracturing a surrounding formation
BE1012889A3 (en) Cutting elements with a layer of fuel-free binder.
EP0791723B1 (en) Apparatus and method for sampling an earth formation through a cased borehole
CA2720810C (en) Sonic drill bit for core sampling
CN103726819B (en) Cryogenic gas assists the method for CBM Fracturing technique
Innaurato et al. Experimental and numerical studies on rock breaking with TBM tools under high stress confinement
KR101683619B1 (en) Cell and Method for Triaxial Compression Test
JP5624189B2 (en) Apparatus and method for obtaining frozen specimens from frozen biological samples
CA1304736C (en) Rock bits and inserts therefor
US4597444A (en) Method for excavating a large diameter shaft into the earth and at least partially through an oil-bearing formation
EP2718536B1 (en) Method for strengthening a wellbore of a well
US5657822A (en) Drill hole plugging method utilizing layered sodium bentonite and liquid retaining particles
Motoyama The second deep ice coring project at Dome Fuji, Antarctica
NO343465B1 (en) Testing of the bedrock around a borehole with a formation tester on a drill string
BR0111521A (en) Real time method for maintaining the stability of an underground formation
US2187275A (en) Means for locating and cementing off leaks in well casings
US20040149495A1 (en) Low-contact area cutting element
EA200401585A1 (en) Method of control of seismic phenomena
WO2005003648A1 (en) A method of constructing a geothermal heat exchanger
US7905286B2 (en) Method and apparatus for sealing a hole made with a cased hole formation tester
GB2465504B (en) Expansion and sensing tool
CA2435382A1 (en) Device and method to seal boreholes
EP2415960A3 (en) Continuous flow drilling systems and methods

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination