CN108226192A - A kind of acid-etched fracture morphological feature acquisition methods - Google Patents
A kind of acid-etched fracture morphological feature acquisition methods Download PDFInfo
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- CN108226192A CN108226192A CN201611185118.1A CN201611185118A CN108226192A CN 108226192 A CN108226192 A CN 108226192A CN 201611185118 A CN201611185118 A CN 201611185118A CN 108226192 A CN108226192 A CN 108226192A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a kind of acid-etched fracture morphological feature acquisition methods, belong to reservoir exploration and development technical field.The method includes：Obtain several testing rock cores, radiography is carried out non-destructive testing to the testing rock core before test, obtain fracture pattern feature image before the testing rock core is tested, core test is penetrated using acid solution to the testing rock core, radiography is carried out non-destructive testing to the testing rock core after test, obtain fracture pattern feature image after the testing rock core is tested, it can be used for the acid-etched fracture morphological feature for obtaining different acid solution types and lower formation different in flow rate, rock core hole can accurately be embodied, microcrack development condition and acidizing wormhole form, and acquisition methods cost is relatively low, image is intuitive, have a wide range of application, parameter optimization and acid solution type for the construction of carbonate reservoir matrix acidifying preferably provide foundation, there is preferable application prospect in reservoir exploration and development.
Description
Technical field
The invention belongs to reservoir exploration and development technical field, more particularly to a kind of acid-etched fracture morphological feature acquisition side
Method.
Background technology
For carbonate formation, matrix acidifying is to note the acid solution being centainly formulated less than under formation fracture pressure
Enter in stratum, tamper or kluftkarren wall surface in microcrack are dissolved by acid solution, gull or formation are similar to earthworm
Duct method, can play the role of bypass contaminated zone, improve stratum filtration condition, and then realize well production increment mesh
's.In matrix acidifying, Hoefner and Fogler (1988) and Wang (1993) etc. are driven by the core carried out with acid solution
Find that under different charge velocities the acid-etched fracture morphological differences formed after sour corrosion rock is very big for experiment.Research hair
Existing, there are an optimal charge velocities so that the acid solution that earthworm hole is penetrated needed for certain length core is minimum.In certain reservoir item
Under part, when carrying out acidification transformation with optimal discharge capacity, the acidizing wormhole depth formed after the lower transformation of certain acid amount can be made
It is deeper, so as to reach preferable effect of increasing production；Or it in order to reach certain treatment radius, is injected when with optimum capacity
When, acid solution used can be made minimum, so as to play the role of reducing construction cost.
Existing acid-etched fracture Morphological Characterization method mainly has：One kind is to carry out analog approach using mathematical model, with double rulers
It is representative to spend continuous model simulation earthworm hole forming process, principle be based on darcy Scale Model and pore scale model,
Darcy scale variable and pore scale variable are coupled with the relational expression of darcy scale parameter by establishing pore structure, with porosity
Distribution form represents earthworm pore morphology；Another method is large scale acidizing wormhole analogy method, is filled using large scale reservoir simulation
It puts, acid resistance soluble alloy moulding material is injected by earthworm hole by injection moulding system, after material molding to be formed, removal
Unreacted is appeared core, takes out moulding material, observes acidizing wormhole form.
In the implementation of the present invention, the inventors discovered that having at least the following problems in the prior art：
Double scale continuous model simulation earthworm holes, which are formed, can annotate earthworm hole growth course from scratch, but continuous with double scales
Model does not account for acid-rock reaction for the mathematical model of representative can cause the raising of local temperature and acid-rock reaction to generate titanium dioxide
Carbon phase state has reaction speed a degree of influence, and the earthworm pore morphology for eventually leading to simulation has with true acidizing wormhole form
Larger discrepancy；Large scale acidizing wormhole analogy method passes through by using injection forming material is pumped after rock core breakthrough experiment of appearing
The morphological feature of section bar material characterizes the acid etching situation of rock core, it is impossible to what true simulation subsurface reservoir rock core acidizing wormhole was formed
Situation, error are larger.
Invention content
In view of this, the present invention provides a kind of acid-etched fracture morphological feature acquisition methods, is obtained in a manner of low cost true
Real intuitive acid-etched fracture morphological feature.
Specifically, including following technical solution：
A kind of acid-etched fracture morphological feature acquisition methods, the method includes：
Obtain several testing rock cores；
Radiography is carried out non-destructive testing to the testing rock core before test, the testing rock core is obtained and tests preceding crack
Morphological feature picture；
Core test is penetrated using acid solution to the testing rock core；
Radiography is carried out non-destructive testing to the testing rock core after test, obtains crack after the testing rock core test
Morphological feature picture.
Further, after several testing rock cores of acquisition and to the lossless inspection of testing rock core progress before test
It surveys before radiography, the method further includes：The testing rock core is dried, the testing rock core is vacuumized, then to described
Testing rock core saturation normal saline solution measures the pore volume and permeability of the testing rock core.
Further, the testing rock core before described pair of test carries out non-destructive testing radiography, obtains the test
Before core test fracture pattern feature image and described pair test after the testing rock core carry out non-destructive testing radiography, obtain
The embodiment of fracture pattern feature image is as follows after being tested to the testing rock core：
1) the acid filling direction of the testing rock core is demarcated, by the testing rock core with 90 ° of both direction calibration scribing line；
2) by X-ray machine X downward, 650~700mm from the ground, spreads stereotype on ground, film is made to be placed on stereotype, and with
Ray is vertical；
3) it places font in the film edge testing rock core is numbered, be put at the film center described
Testing rock core makes font image not overlapped with the testing rock core image；
4) exposure room gate is closed, is exposed in preset duration；
5) testing rock core is rotated horizontally 90 °, repeats step 2)~4)；
6) after end exposure, darkroom disposal is carried out, by developing, stopping to show, being fixed, cleaning, rinsing, natural air drying, is obtained
To the testing rock core fracture pattern feature image.
Further, the acid solution penetrates the test device of core test and includes：Core holding unit, liquid storage cylinder, metering pump,
Metering system, flow line, experiment parameter control system and data collection and transfering system.
Further, the flow line is full of normal saline solution.
Further, the acid solution, which penetrates, applies the testing rock core using confining pressure pump in the test process of core test
Higher than the confining pressure of pump 3~5MPa of injection pressure power.
Further, the acid solution penetrates core test and starts to flow in test pressure bust, the testing rock core port of export
Go out 1~1.5min of acid solution or stop note when being shown after 40~45min of testing rock core injection end injection acid solution without pressure drop
Enter acid solution.
Further, the center of the testing rock core injection end drills through the circular hole of 0.2~0.3cm × 0.3~0.5cm, uses
In the contact area for increasing acid and the testing rock core.
Further, a diameter of 25.4~50.8mm of the testing rock core.
The advantageous effect of technical solution provided in an embodiment of the present invention：
By obtaining several testing rock cores, radiography is carried out non-destructive testing to the testing rock core before test first,
Fracture pattern feature image before the testing rock core is tested is obtained, then core test is penetrated using acid solution to the testing rock core,
Radiography finally is carried out non-destructive testing to the testing rock core after test, obtains fracture pattern after the testing rock core test
Feature image can be used for the acid-etched fracture morphological feature for obtaining different acid solution types and lower formation different in flow rate, can be accurate
Rock core hole, microcrack development condition and acidizing wormhole form are embodied, and acquisition methods cost is relatively low, image is intuitive, using model
Enclose wide, parameter optimization and acid solution type for carbonate reservoir matrix acidifying construction preferably provide foundation, are surveyed in oil-gas reservoir
Visiting has preferable application prospect in exploitation.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of method flow diagram of acid-etched fracture morphological feature acquisition methods of the embodiment of the present invention；
Fig. 2 is that the pump injection pressure power of conventional acid penetration core test and penetration volume change over time relational graph；
Fig. 3 is that the pump injection pressure power of steering acid penetration core test and penetration volume change over time relational graph；
Fig. 4 is testing rock core after testing rock core fracture pattern characteristic pattern before the test of conventional acid penetration core test and test
Fracture pattern characteristic pattern；
Fig. 5 be turn to acid penetration core test test before testing rock core fracture pattern characteristic pattern and test after testing rock core
Fracture pattern characteristic pattern.
Specific embodiment
To make technical scheme of the present invention and advantage clearer, embodiment of the present invention is made below in conjunction with attached drawing into
One step it is described in detail.
A kind of acid-etched fracture morphological feature acquisition methods are present embodiments provided, as shown in Figure 1, this method includes：
Step 101：Obtain several testing rock cores；
The testing rock core that reservoir core is processed as meeting test size, ensure testing rock core a diameter of 25.4~
50.8mm, the center of testing rock core injection end drill through the circular hole of 0.2~0.3cm × 0.3~0.5cm, for increasing acid and test
The contact area of rock core.
In the present embodiment, several a diameter of 25.4mm are chosen, the carbonate rock rock core that length is 50.8mm is test rock
The heart, when injection acid is conventional acid, by the carbonate rock that carbonate rock rock core is processed as a diameter of 24.9mm, length is 49.4mm
Rock core；When injection acid is turns to acid, by the carbonate that carbonate rock rock core is processed as a diameter of 24.9mm, length is 48.0mm
Rock rock core.
Step 102：Radiography is carried out non-destructive testing to the testing rock core before test, testing rock core is obtained and tests preceding crack
Morphological feature picture；
First, before radiography is carried out non-destructive testing to the testing rock core before test, testing rock core is dried, to test
Rock core vacuumizing, then to testing rock core saturation normal saline solution, measure the pore volume and permeability of testing rock core.Specifically, it dries
Dry testing rock core, and the testing rock core of drying is placed in the vessel, 7~8h is vacuumized, testing rock core is weighed, obtains saturation standard
The quality of testing rock core before brine to testing rock core saturation normal saline solution in vacuum tank, at least impregnates 40h, weighs test
Rock core obtains the quality of testing rock core after saturation normal saline solution, then the calculation formula of pore volume is as follows：
When injection acid is conventional acid, the pore volume of testing rock core is 0.8273cm3, porosity 5.6935%；When
When injection acid is turns to acid, the pore volume of testing rock core is 1.5538cm3, porosity 6.3945%.
Specifically embodiment is as follows for the step：
1) the injection acid solution direction of testing rock core is demarcated, by testing rock core with 90 ° of both direction calibration scribing line；
2) by X-ray machine X downward, 650~700mm from the ground, spreads stereotype on ground, film is made to be placed on stereotype, and with
Ray is vertical；
3) it places font in film edge testing rock core is numbered, puts testing rock core at film center, make font
Image is not overlapped with testing rock core image；
4) exposure room gate is closed, is exposed in preset duration, predeterminated voltage is 110kv in the present embodiment, is exposed
It is 1min between light time, film density 3.0；
5) testing rock core is rotated horizontally 90 °, repeats step 2)~4)；
6) after end exposure, darkroom disposal is carried out, by developing, stopping to show, being fixed, cleaning, rinsing, natural air drying, is obtained
Rock core fracture pattern feature image before to test.
In the present embodiment, rock core fracture pattern characteristic pattern before the test obtained for being injected separately into conventional acid and steering acid
Piece is as shown in Figure 4, Figure 5.
Step 103：Core test is penetrated using acid solution to testing rock core；
Specifically, acid solution penetrates the test device of core test and includes：Core holding unit, liquid storage cylinder, metering pump, metering system
System, flow line, experiment parameter control system and data collection and transfering system.First the testing rock core after saturation normal saline solution is put
Enter in clamper, pump injection port direction is rock core injection end, then opens confining pressure pump first to testing rock core slowly plus 2MPa's
Confining pressure ensures flow line full of normal saline solution, i.e., full of normal saline solution in injection pipeline and outlet line, in reservoir temperature
With acid solution is injected under preset flow, in the present embodiment, reservoir temperature be 140 DEG C, preset flow 10ml/min, respectively to straight
Implantation concentration is 20% in the testing rock core that diameter is 24.9mm, length is 49.4mm conventional acid, to a diameter of 24.9mm, length
The steering acid for being 20% for implantation concentration in the testing rock core of 48.0mm obtains different injection acid using data collection and transfering system
Submerged pump injection pressure power and penetration volume change with time figure, as shown in Figure 2 and Figure 3.
Meanwhile acid solution is penetrated and testing rock core is applied higher than pump injection pressure power using confining pressure pump in the test process of core test
The confining pressure of 3~5MPa, test pressure bust, the testing rock core port of export begin to flow out 1~1.5min of acid solution or to test rock
Stop injection acid solution when being shown after 40~45min of heart injection end injection acid solution without pressure drop, in the present embodiment, when injection acid is normal
During rule acid, pump injection pressure power rises to bust after 6.8MPa, and volume is 13ml when acid solution penetrates, and stops pump after penetrating rock core 1min
Note；When injection acid is turns to acid, pump injection pressure power rises to constant pressure pump note 2min after setting maximum pressure 17.5MPa, pressure
Bust is 10MPa, and volume is 10ml when acid solution penetrates, and stops pump note after penetrating rock core 1min, as shown in Figure 2 and Figure 3, finally closes
Displacement pump is closed, slowly unloads confining pressure, takes out testing rock core, completes test.
Step 104：Radiography is carried out non-destructive testing to the testing rock core after test, obtains crack after testing rock core test
Morphological feature picture.
Specifically embodiment is as follows for the step：
1) calibration scribing line is repeated with the 90 ° of both directions demarcated before test；
2) by X-ray machine X downward, 650~700mm from the ground, spreads stereotype on ground, film is made to be placed on stereotype, and with
Ray is vertical；
3) it places font in film edge testing rock core is numbered, puts testing rock core at film center, make font
Image is not overlapped with testing rock core image；
4) exposure room gate is closed, is exposed in preset duration, predeterminated voltage is 110kv in the present embodiment, is exposed
It is 1min between light time, film density 3.0；
5) testing rock core is rotated horizontally 90 °, repeats step 2)~4)；
6) after end exposure, darkroom disposal is carried out, by developing, stopping to show, being fixed, cleaning, rinsing, natural air drying, is obtained
Rock core fracture pattern feature image after to test.
In the present embodiment, for rock core fracture pattern characteristic pattern after being injected separately into conventional acid, turning to sour obtained test
Piece is as shown in Figure 4, Figure 5.After film drying, film is placed on viewbox and is observed, split by the rock core before and after contrast test
Slit state feature image using conventional acid penetration rock core it is found that form apparent acidizing wormhole, and acid solution reacts acute with rock
Strong, etching groove is deeper, and acid solution is reacted with rock in contact, penetrates the acid amount bigger needed for rock；Using turning to acid penetration
Rock core forms apparent acidizing wormhole, under identical experiment condition, compared with conventional acid, turns to acid needed for acid penetration rock core
Liquid measure is less, and the acidizing wormhole of formation is more shallow, and width is narrower.
The present embodiment first carries out non-destructive testing the testing rock core before test ray photograph by obtaining several testing rock cores
Phase, obtain testing rock core test before fracture pattern feature image, then testing rock core is respectively adopted conventional acid, turn to acid respectively into
Row acid solution penetrates core test, then carries out non-destructive testing radiography to the testing rock core after test, obtains testing rock core survey
Fracture pattern feature image after examination can be used for obtaining different acid solution types and the acid-etched fracture form of lower formation different in flow rate be special
Sign, can accurately embody rock core hole, microcrack development condition and acidizing wormhole form, and acquisition methods cost is relatively low, image
Intuitively, having a wide range of application, the parameter optimization and acid solution type for the construction of carbonate reservoir matrix acidifying preferably provide foundation,
There is preferable application prospect in reservoir exploration and development.
The above is for only for ease of it will be understood by those skilled in the art that technical scheme of the present invention, not limiting
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of acid-etched fracture morphological feature acquisition methods, which is characterized in that the method includes：
Obtain several testing rock cores；
Radiography is carried out non-destructive testing to the testing rock core before test, obtains fracture pattern before the testing rock core test
Feature image；
Core test is penetrated using acid solution to the testing rock core；
Radiography is carried out non-destructive testing to the testing rock core after test, obtains fracture pattern after the testing rock core test
Feature image.
2. according to the method described in claim 1, it is characterized in that, after several testing rock cores of acquisition and before to test
The testing rock core carry out non-destructive testing radiography before, the method further includes：The testing rock core is dried, to described
Testing rock core vacuumizes, then to the testing rock core saturation normal saline solution, measures pore volume and the infiltration of the testing rock core
Rate.
3. according to the method described in claim 1, it is characterized in that, the testing rock core before described pair of test carries out lossless inspection
Radiography is surveyed, obtains the testing rock core after fracture pattern feature image and described pair of test after testing rock core test
Radiography is carried out non-destructive testing, the embodiment for obtaining fracture pattern feature image after the testing rock core is tested is as follows：
1) the injection acid solution direction of the testing rock core is demarcated, by the testing rock core with 90 ° of both direction calibration scribing line；
2) by X-ray machine X downward, 650~700mm from the ground, spreads stereotype on ground, film is made to be placed on stereotype, and and ray
Vertically；
3) it places font in the film edge testing rock core is numbered, the test is put at the film center
Rock core makes font image not overlapped with the testing rock core image；
4) exposure room gate is closed, is exposed in preset duration；
5) testing rock core is rotated horizontally 90 °, repeats step 2)~4)；
6) after end exposure, darkroom disposal is carried out, by developing, stopping to show, being fixed, cleaning, rinsing, natural air drying, obtains institute
State testing rock core fracture pattern feature image.
4. according to the method described in claim 1, it is characterized in that, the test device that the acid solution penetrates core test includes：
Core holding unit, liquid storage cylinder, metering pump, metering system, flow line, experiment parameter control system and data acquisition transmission system
System.
5. according to the method described in claim 4, it is characterized in that, the flow line is full of normal saline solution.
6. according to the method described in claim 1, it is characterized in that, the acid solution penetrate core test test pressure bust,
The testing rock core port of export begin to flow out 1~1.5min of acid solution or to the testing rock core injection end injection acid solution 40~
Stop injection acid solution when being shown after 45min without pressure drop.
7. according to the method described in claim 1, it is characterized in that, the center of the testing rock core injection end drill through 0.2~
The circular hole of 0.3cm × 0.3~0.5cm, for increasing the contact area of acid and the testing rock core.
8. according to the method described in claim 1, it is characterized in that, a diameter of 25.4~50.8mm of the testing rock core.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111999140A (en) * | 2020-08-05 | 2020-11-27 | 中国石油天然气股份有限公司 | Method and device for preparing acoustic emission sample and determining fracturing pump and storage medium |
| WO2020252801A1 (en) * | 2019-06-18 | 2020-12-24 | 中国石油大学(华东) | Device for real-time monitoring of dynamic propagation of wormholes during carbonate rock acidification, and operation method therefor |
| CN116525021A (en) * | 2023-03-24 | 2023-08-01 | 中国石油大学(华东) | Carbonate rock acidification simulation method based on improved double-scale model |
-
2016
- 2016-12-20 CN CN201611185118.1A patent/CN108226192A/en active Pending
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| 李道轩: "《薄互层低渗透油藏开发技术》", 31 October 2007, 中国石油大学出版社 * |
| 美国无损检测学会: "《美国无损检测手册 射线卷》", 31 July 1992, 世界图书出版公司 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020252801A1 (en) * | 2019-06-18 | 2020-12-24 | 中国石油大学(华东) | Device for real-time monitoring of dynamic propagation of wormholes during carbonate rock acidification, and operation method therefor |
| CN111999140A (en) * | 2020-08-05 | 2020-11-27 | 中国石油天然气股份有限公司 | Method and device for preparing acoustic emission sample and determining fracturing pump and storage medium |
| CN111999140B (en) * | 2020-08-05 | 2023-09-26 | 中国石油天然气股份有限公司 | Method and device for preparing acoustic emission sample and determining fracturing pump and storage medium |
| CN116525021A (en) * | 2023-03-24 | 2023-08-01 | 中国石油大学(华东) | Carbonate rock acidification simulation method based on improved double-scale model |
| CN116525021B (en) * | 2023-03-24 | 2024-03-22 | 中国石油大学(华东) | Carbonate rock acidification simulation method based on improved double-scale model |
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Application publication date: 20180629 |