CN104964866B - A kind of loose sand rock core oil washing method - Google Patents
A kind of loose sand rock core oil washing method Download PDFInfo
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- CN104964866B CN104964866B CN201510334939.6A CN201510334939A CN104964866B CN 104964866 B CN104964866 B CN 104964866B CN 201510334939 A CN201510334939 A CN 201510334939A CN 104964866 B CN104964866 B CN 104964866B
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Abstract
The invention discloses a kind of method of loose sand rock core oil washing, belong to reservoir core preparing technical field.The whole column rock core cut is radially wrapped up and fixed with filter paper first by this method；The both ends of filter paper grow the both ends of column rock core；Circular filter paper is encased inside rock core both ends again, and is encased inside the pad for being provided with through hole, the square filter paper at rock core both ends will be grown along the inside bending of pad, and roll fixation；The rock core prepared is put into washing oil in device for washing oil.This method is while normal washing oil is ensured, ensure the relative integrity of loose sand rock core, ensure the accuracy of follow-up test data, the methods of compared to traditional liquid nitrogen frozen/thermoplastic parcel sealing, simplify operating procedure, cost is reduced, operating process is easily controllable, improves the economic benefit of rock stratum energy extraction.
Description
Technical field
The present invention relates to reservoir core preparing technical field, and in particular to a kind of loose sand rock core oil washing method.
Background technology
During In Oil Field Exploration And Development, it is highly desirable by the porosity of the original rock core of test development series of strata, permeability,
The experimental datas such as saturation degree, and then the physics of analysis testing rock core, chemical property, architectural feature, but loose sand cementing properties
Difference, the factors such as short texture and intensity are smaller, make it in drilling and coring delivery, drilling machine is cored, rock core it is whole cut, washing oil, survey permeability and
Rock core breakage is easily caused in the links such as core experiment, experiment can not continue, often formed " number it is hard to find " difficult situation, sternly
The development decision-making and effect in oil field are have impact on again, therefore ensures the integrity of each good link loose sand rock core, to loose
The development and utilization of sandstone has the function that important.
Currently in order to ensureing the integrity of rock core, the preparation method of several rock cores is developed, mainly using split
The mode for adopting rock core progress sealing realizes that such as Xu Jianjun exists《A kind of sampling method research of loose sand rock core》In disclose
Four kinds of sealing methods, respectively with sheet lead sleeve sealing, only with polytetrafluoroethylene (PTFE) adhesive tape sealing, with polytetrafluoroethylene (PTFE) adhesive tape and lead
Skin sleeve combination sealing, wax boil consolidation realization and sealed with wax；Such as Li Haijiang exists《The shallow special core sample technology of preparing of view》Disclosed in
Rock sample can be produced using liquid nitrogen freezing for loose sand, and the mode encapsulated to freezing rock sample prepares rock core,
Ensure integrity of the rock core in experimentation, wherein encapsulating is to use first rock core to be wrapped up with liners such as polytetrafluoroethylene (PTFE)
Afterwards, web is put, puts trim ring, heat-shrink tube is put and is baked on alcolhol burner untill intact contraction fastening.
But the disclosed rock core preparation method for ensureing that rock core is intact of above-mentioned prior art, cost is high, the complexity in operation
Property and danger rock core that is high, and preparing, wrap up and easily form annular space between skin-rock core, and be not easy to be found, cause to test
Data deviation is larger, is unsuitable for economization reservoir energy extraction.And investigation Karamay oilfield cost huge fund is purchased correlation and set
It is standby, according to professional standard SY/T5336-2006《Core analysis method》, use《The shallow special core sample technology of preparing of view》Middle public affairs
The method of the liquid nitrogen frozen opened/thermoplastic parcel realizes the sealing of rock core, ensures the integrity of rock core, while cost consumption, behaviour
Waste time and energy, be not easy to control its accuracy, without high economic benefit.
The content of the invention
The defects of in order to overcome prior art, an object of the present invention are to provide a kind of loose sand rock core oil washing side
Method, while ensureing rock core integrity, simplify operating procedure, it is cost-effective, improve the accuracy of Data Detection.
A kind of loose sand rock core oil washing method, including following operating procedure：
1) the whole column rock core cut is radially wrapped up with circumferential filter paper, and it is fixed；The both ends of circumferential filter paper are grown
The both ends end of column rock core；
2) the end filter paper for setting and being matched with its end shape is padded respectively in the both ends end of column rock core, then pad sets branch respectively
Stake pad piece, the shape of the support pad match with column rock core both ends end shape, will grow the circumferential of rock core both ends end and filter
Paper is folded inwardly over pad along support pad week edge respectively, and fixed；Through hole is provided with the support pad；
3) rock core prepared by step 2) is put into washing oil in device for washing oil, that is, completed.
Radially wound with cotton thread in step 1) and roll fixed circumferential filter paper.
In step 2) fixed filter paper is rolled using cotton thread is longitudinally wound.
Device for washing oil described in step 3) is extractor.
The column rock core is shaped as cylinder.
The both ends of the circumferential filter paper grow 40~100mm of both ends end of column rock core.
Loose sand rock core oil washing method of the present invention, parcel sealing is carried out to rock core side first using filter paper, avoids side
Face is damaged scaling-off during washing oil, is carrying out compression sealing to the end of rock core with filter paper and pad afterwards, has certain strong
The pad of degree can be good at compressing rock core both ends, and preventing and treating rock core end face is damaged, and because the effect of pad makes side wrap
Filter paper does not damage while bending rolling in end allows to and is brought into close contact rock core rolling to the end edge of rock core, comprehensively
Guarantee rock core integrity.Further, since the permeable oiliness of filter paper, it is ensured that the rock core wrapped can be carried out smoothly
Washing oil operates, meanwhile, the side and end of rock core use filter paper tight, filter paper after washing oil is dried between rock core not
In the presence of bonding, filter paper is easily removed from rock core, be subsequently used for the detection of the data such as follow-up permeability, ensure Data Detection
Accuracy；And traditional liquid nitrogen frozen/thermoplastic parcel sealing method, because the integument of rock core is to be fixedly arranged at rock in a heated condition
It heart surface, can not be removed after washing oil from rock core, and be easier to form annular spaces between integument and rock core, wash this
Rock core after oil causes larger deviation when being detected for follow-up permeability.
Loose sand rock core oil washing method of the present invention, compared to traditional liquid nitrogen frozen/thermoplastic parcel sealing method, without entering
Row freezing and the process of thermoplastic, simplify operating procedure, and safe operation process is easily controllable, while without using expensive liquid nitrogen
Freezing equipment, cost is reduced, and avoid thermoplastic integument and be easier to form annular spaces between rock core, cause permeability to examine
The defects of measured value deviation is big, ensure the accuracy of follow-up data detection, improve the economic benefit of rock stratum energy extraction.
Brief description of the drawings
The loose sand rock core oil washing method flow diagram of Fig. 1 embodiments 1；
Circumferential filter paper parcel rock core schematic diagram in Fig. 2 embodiments 1；
The support pad schematic diagram used in Fig. 3 embodiments 1.
Embodiment
The present invention is described in further detail with reference to specific embodiment, but does not form any limit to the present invention
System.
Embodiment 1
The present embodiment loose sand rock core oil washing method, technological process is as shown in figure 1, concrete operation step is：
1) filter paper is prepared：The filter paper that cut size size is (120~150) mm × (120~150) mm is filtered as circumferential
Paper, a diameter of 25mm filter paper is cut as end filter paper；
2) rock core is wrapped circumferentially around：With circumferential filter paper 1 by the whole a diameter of 25mm cut, length is 50~80mm rock core 4
Radially wrap up, and radially wound with cotton thread and roll fixation, now the end 2 of rock core and end 3 are respectively present the week grown
To 40~100mm of filter paper, as shown in Figure 2；
3) rock core end is wrapped up：Padded respectively in the both ends end of column rock core and set end filter paper, then pad set it is as shown in Figure 3
A diameter of 25mm of through hole 5 circular support pad 6 is provided with, by the circumferential filter paper of the rock core both ends end grown along supporting pad
The all edges of piece are folded over pad, and roll fixation with cotton thread is longitudinally wound；
4) rock core prepared by step 3) is put into washing oil in having extracted, that is, completed.
Comparative example 1
Take, physical property consistent rock core, using conventional method washing oil, concrete operation step identical with the dimensions of embodiment 1
For：
1) rock core is put into core chamber, core chamber is put into flask, then solvent is injected in flask, and liquid level reaches flask
2/3；
2) each interface of instrument is sealed to prevent loss of liquid；
3) in the cyclic process of heating/distillation/immersion rock core, stop adding when the solvent of core chamber reaches water white transparency
Heat, more than 8h is soaked, core chamber's solvent is still water white transparency, then below unstressed configuration or display three-level, i.e., it is to carry out Fluorescence Identification
Complete washing oil.
Comparative example 2
, physical property consistent rock core identical with the dimensions of embodiment 1 is taken, sealing rock core is wrapped up using liquid nitrogen frozen/thermoplastic
The method of washing oil carries out washing oil to rock core again afterwards.
Performance detection
The integrity of the rock core after embodiment 1, comparative example 1 and the washing oil of comparative example 2 is detected respectively, testing result is such as
Shown in table 1 below：
Rock core integrity detects after the embodiment 1 of table 1, comparative example 1 and the washing oil of comparative example 2
Above-mentioned result of the test shows, using the method washing oil of routine, causes rock core edge breakage, scaling-off serious, Wu Fajin
Row subsequent experimental, although and use the rock core after liquid nitrogen frozen/thermoplastic parcel sealing method washing oil to carry out subsequent experimental,
It detects the detected value that permeability detected value significantly greater than uses core permeability after the inventive method washing oil method washing oil, analysis
Its reason, it is occur forming annular between rock core breakage, or rock core and parcel skin using liquid nitrogen frozen/thermoplastic parcel sealing method
Hole, make detected value distortion bigger than normal, the result shows, loose stuff rock core oil washing method of the present invention, the rock core after washing oil is ensured
Integrity while, it is ensured that the accuracy of follow-up test data, meanwhile, simplify operating procedure, reduce the cost, improve reservoir energy
The economic benefit of source exploitation.
Claims (2)
- A kind of 1. loose sand rock core oil washing method, it is characterised in that including following operating procedure：1）The whole column rock core cut is radially wrapped up with circumferential filter paper, and it is fixed；The both ends of circumferential filter paper grow column The both ends end of rock core；2）Pad the end filter paper for setting and being matched with its end shape respectively in the both ends end of column rock core, then pad sets supporting pad respectively Piece, the shape of the support pad match with column rock core both ends end shape, will grow the circumferential filter paper point of rock core both ends end Pad is not folded inwardly over along support pad week edge, and it is fixed；Through hole is provided with the support pad；3）By step 2）The rock core of preparation is put into washing oil in device for washing oil, that is, completes；Step 1）Middle radially wound with cotton thread rolls fixed circumferential filter paper；Step 2）It is middle using cotton thread longitudinally wound rolling fixation Circumferential filter paper；The column rock core is shaped as cylinder；The both ends of the circumferential filter paper grow the both ends end of column rock core 40~100mm of portion.
- 2. the loose sand rock core oil washing method as described in claim 1, it is characterised in that step 3）Described in device for washing oil For extractor.
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| CN104964866B true CN104964866B (en) | 2018-03-09 |
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| CN108896462A (en) * | 2018-05-16 | 2018-11-27 | 中国石油天然气股份有限公司 | Conglomerate porosity determination method |
| CN110715887B (en) * | 2018-07-12 | 2022-07-15 | 中国石油化工股份有限公司 | Method for measuring porosity of bituminous sand |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587857A (en) * | 1984-10-18 | 1986-05-13 | Western Geophysical Company Of America | Method for mounting poorly consolidated core samples |
-
2015
- 2015-06-16 CN CN201510334939.6A patent/CN104964866B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587857A (en) * | 1984-10-18 | 1986-05-13 | Western Geophysical Company Of America | Method for mounting poorly consolidated core samples |
Non-Patent Citations (4)
| Title |
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| 一种疏松砂岩岩芯的取样方法研究;徐建军等;《安徽地质》;20050630;第15卷(第2期);第106-109页 * |
| 浅议特殊岩心样品制备技术;李海江;《中国新技术新产品》;20131231(第4期);第169-170页 * |
| 疏松含油砂岩渗透率测定方法研究;黄福堂等;《石油勘探与开发》;19871231(第02期);第61页第二部分 * |
| 疏松砂岩室内岩心制作方法;张国新等;《钻井液与完井液》;20070131;第24卷(第01期);第23-25页 * |
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