CN112211610A - Method for detecting acid fluid loss performance of reservoir - Google Patents
Method for detecting acid fluid loss performance of reservoir Download PDFInfo
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- CN112211610A CN112211610A CN202011170957.2A CN202011170957A CN112211610A CN 112211610 A CN112211610 A CN 112211610A CN 202011170957 A CN202011170957 A CN 202011170957A CN 112211610 A CN112211610 A CN 112211610A
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- 239000002253 acid Substances 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000011435 rock Substances 0.000 claims abstract description 230
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000007797 corrosion Effects 0.000 claims abstract description 40
- 238000005260 corrosion Methods 0.000 claims abstract description 40
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- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000005530 etching Methods 0.000 claims abstract description 14
- 235000019738 Limestone Nutrition 0.000 claims description 30
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- 206010017076 Fracture Diseases 0.000 claims description 28
- 239000010459 dolomite Substances 0.000 claims description 27
- 229910000514 dolomite Inorganic materials 0.000 claims description 27
- 208000010392 Bone Fractures Diseases 0.000 claims description 16
- 239000003381 stabilizer Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 9
- 208000013201 Stress fracture Diseases 0.000 claims description 8
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- 238000011156 evaluation Methods 0.000 claims description 8
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- 238000002347 injection Methods 0.000 description 11
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The disclosure provides a method for detecting acid fluid loss performance of a reservoir, and belongs to the field of oil and gas field development. The detection method comprises the following steps: preparing a rock template, etching network cracks on the rock template, and etching the network cracks on the rock template, wherein the network cracks comprise a plurality of main cracks and a plurality of micro cracks, and the width of the main cracks is greater than that of the micro cracks; weighing the rock template, and recording the weighing result as the mass before detection; providing acid liquor, and injecting the acid liquor into the rock template; weighing the rock plate sample plate injected with the acid liquor, and recording the weighing result as the detected mass; determining the rock core corrosion rate of the rock template by the quality before detection and the quality after detection; and determining the acid fluid loss performance of the rock plate sample plate according to the rock core corrosion rate of the rock plate sample plate. The method can be used for detecting the acid liquor filtration performance of the complex lithologic fractured reservoir.
Description
Technical Field
The disclosure belongs to the technical field of oil and gas field development, and particularly relates to a method for detecting acid fluid loss performance of a reservoir.
Background
The carbonate oil and gas reservoir storage spaces of Sichuan and Tarim basins and the like mainly comprise natural cracks, large caves and corrosion holes, and 80% of oil wells need to improve the productivity through acid fracturing. Generally, during the acid fracturing, a great amount of acid liquor is lost, so that the bottom of the well cannot be pressurized, and thus, acid cannot be uniformly distributed or new cracks cannot be formed. Therefore, prior to performing acid fracturing, the acid fluid loss performance of the reservoir needs to be tested.
In the related art, the acid fluid loss test detection process of the reservoir generally comprises the steps of directly injecting acid fluid into a rock template made of single lithology, and then observing the flowing and loss process of the acid fluid in the rock template by naked eyes to determine the loss performance of the acid fluid.
However, in the above test process, since the template is made of a single lithology, the acid fluid loss behavior of the oil well with complex lithology cannot be truly reflected in the acid fracturing process.
Disclosure of Invention
The embodiment of the disclosure provides a method for detecting the acid fluid loss performance of a reservoir, which can be used for detecting the acid fluid loss performance of the reservoir with complex lithology. The technical scheme is as follows:
the embodiment of the disclosure provides a method for detecting acid fluid loss performance of a reservoir,
the detection method comprises the following steps:
preparing a rock sample plate, wherein the rock sample plate comprises a dolomite rock plate and a limestone rock plate which are connected together along the length direction of the rock sample plate;
etching network cracks on the rock plate sample plate, wherein the network cracks comprise a plurality of main cracks and a plurality of micro cracks, and the width of the main cracks is larger than that of the micro cracks;
weighing the rock template, and recording the weighing result as the mass before detection;
providing acid liquor, and injecting the acid liquor into the rock template;
weighing the rock plate sample plate injected with the acid liquor, and recording the weighing result as the detected mass;
determining the rock core corrosion rate of the rock template according to the mass before detection and the mass after detection;
and determining the acid liquor filtration performance of the rock plate sample plate according to the rock core corrosion rate of the rock plate sample plate.
In one implementation of the present disclosure the method of preparing a rock template includes:
determining the volume ratio between the dolomite rock plate and the limestone rock plate according to the logging data;
providing the dolomite rock plate and the limestone rock plate according to the volume ratio;
and bonding the dolomite slab and the limestone slab together through a bonding agent.
In one implementation of the present disclosure the etching network fractures in the rock plate template includes:
scanning an imaging logging result according to the formation micro-resistivity, and determining the initial width of the main fracture and the initial width of the micro-fracture;
and etching the main cracks and the micro cracks on the surface of the rock plate sample plate.
In one implementation of the present disclosure, the injecting the acid solution into the rock plate template includes:
providing a dynamic fluid loss evaluator;
and injecting the acid liquor into the rock template through the dynamic fluid loss evaluation instrument.
In one implementation of the present disclosure, the injecting the acid solution into the rock plate template includes:
injecting the acid solution into the rock plate template at a constant rate.
In an implementation manner of the present disclosure, determining a core erosion rate of the rock template by the pre-detection mass and the post-detection mass includes:
the rock core corrosion rate of the rock plate sample plate meets the following formula:
wherein eta is the core corrosion rate of the rock template; m1For the pre-examination mass of the rock sample plate, M2And detecting the quality of the rock plate sample plate before detection.
In one implementation of the present disclosure, after the providing the acid solution, the detecting method further includes:
adding gelling agent, iron ion stabilizer, corrosion inhibitor, corrosion inhibition synergist, cleanup additive and clay stabilizer into the acid liquor.
In one implementation of the present disclosure, after determining the core erosion rate of the template, the detection method further includes:
and scanning the rock plate sample plate, and determining the width change of the main crack and the width change of the micro-crack.
In one implementation of the present disclosure, the scanning the rock template to determine the width variation of the main fracture and the width variation of the micro-fracture includes:
providing a three-dimensional scanner;
scanning the rock template sample plate through the three-dimensional scanner to determine the final width and the final width of the microcracks;
obtaining a width difference value of the main crack according to the initial width and the final width of the main crack;
and obtaining the width difference of the microcracks according to the initial width and the final width of the microcracks.
In one implementation of the present disclosure, the acid solution is hydrochloric acid.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the method for detecting the acid fluid loss performance of the reservoir is used for detecting the acid fluid loss performance of the reservoir, a rock template is prepared firstly in the detection method, and the rock template comprises a dolomite rock plate and a limestone rock plate, so that the stratum structure of complex lithology in an oil reservoir can be simulated through the rock template, and the problem that the acid fluid loss performance of the reservoir cannot be accurately detected due to single lithology is avoided.
And then, etching the main cracks and the micro cracks on the rock plate sample plate to simulate natural cracks in the stratum in the oil reservoir, so that the rock plate sample plate can simulate the stratum structure vividly, and the acid fluid loss performance of the reservoir can be detected more accurately. And then weighing the rock plate sample plate to obtain the quality of the rock plate sample plate before detection.
And then injecting acid liquor into the rock plate sample plate so as to detect the acid liquor filtration performance of the rock plate sample plate. And after acid is injected, weighing the rock plate sample plate again, determining the rock core corrosion rate of the rock plate sample plate according to the mass of the rock plate sample plate before and after acid injection, and judging the filtration performance of the rock plate sample plate to be tested according to the rock core corrosion rate of the rock plate sample plate.
When the method for detecting the acid fluid loss performance of the reservoir stratum provided by the disclosure is used for detecting the acid fluid loss performance of the reservoir stratum, the rock template sample plate is manufactured to comprise a dolomite rock plate and a limestone rock plate, so that the reservoir stratum with complex lithology can be simulated, natural fractures of the reservoir stratum can be simulated truly, and the acid fluid loss performance of the reservoir stratum with complex lithology and fractures is finally realized. And when the detection is carried out, the acid liquor filtration performance of the sample plate to be detected is judged directly according to the mass difference of the sample plate before and after acid injection, so that the problem that the acid liquor filtration performance of a reservoir cannot be scientifically and accurately determined due to direct observation of naked eyes is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting fluid loss properties of an acid solution according to an embodiment of the present disclosure;
fig. 2 is a flow chart of another method for detecting fluid loss properties of an acid solution according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a rock plate template provided by an embodiment of the disclosure.
The symbols in the drawings represent the following meanings:
101. an inlet; 102. an outlet; 103. a main crack; 104. micro-cracking;
1. a dolomitic rock plate; 2. a limestone slab.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the disclosure provides a detection method for the fluid loss performance of an acid liquid, as shown in fig. 1, the detection method includes:
s101: preparing a rock template, wherein the rock template comprises a dolomite rock plate and a limestone rock plate which are connected together along the length direction of the rock template.
S102: and etching network cracks on the rock template, wherein the network cracks comprise a plurality of main cracks and a plurality of micro cracks, and the width of the main cracks is larger than that of the micro cracks.
S103: and weighing the rock template, and recording the weighing result as the mass before detection.
S104: providing acid liquor, and injecting the acid liquor into the rock template.
S105: and weighing the rock plate sample plate injected with the acid liquor, and recording the weighing result as the detected mass.
S106: and determining the rock core corrosion rate of the rock template by the quality before and after detection.
S107: and determining the acid fluid loss performance of the rock plate sample plate according to the rock core corrosion rate of the rock plate sample plate.
When the method for detecting the acid fluid loss performance of the reservoir is used for detecting the acid fluid loss performance of the reservoir, a rock template is prepared firstly in the detection method, and the rock template comprises a dolomite rock plate and a limestone rock plate, so that the stratum structure of complex lithology in an oil reservoir can be simulated through the rock template, and the problem that the acid fluid loss performance of the reservoir cannot be accurately detected due to single lithology is avoided.
And then, etching the main cracks and the micro cracks on the rock plate sample plate to simulate natural cracks in the stratum in the oil reservoir, so that the rock plate sample plate can simulate the stratum structure vividly, and the acid fluid loss performance of the reservoir can be detected more accurately. And then weighing the rock plate sample plate to obtain the quality of the rock plate sample plate before detection.
And then injecting acid liquor into the rock plate sample plate so as to detect the acid liquor filtration performance of the rock plate sample plate. And after acid is injected, weighing the rock plate sample plate again, determining the rock core corrosion rate of the rock plate sample plate according to the mass of the rock plate sample plate before and after acid injection, and judging the filtration performance of the rock plate sample plate to be tested according to the rock core corrosion rate of the rock plate sample plate.
When the method for detecting the acid fluid loss performance of the reservoir stratum provided by the disclosure is used for detecting the acid fluid loss performance of the reservoir stratum, the rock template sample plate is manufactured to comprise a dolomite rock plate and a limestone rock plate, so that the reservoir stratum with complex lithology can be simulated, natural fractures of the reservoir stratum can be simulated truly, and the acid fluid loss performance of the reservoir stratum with complex lithology and fractures is finally realized. And when the detection is carried out, the acid liquor filtration performance of the sample plate to be detected is judged directly according to the mass difference of the sample plate before and after acid injection, so that the problem that the acid liquor filtration performance of a reservoir cannot be scientifically and accurately determined due to direct observation of naked eyes is avoided.
Fig. 2 is a flowchart of another method for detecting fluid loss properties of an acid solution according to an embodiment of the present disclosure, where in combination with fig. 2, the method includes:
s201: preparing a rock template, wherein the rock template comprises a dolomite rock plate and a limestone rock plate which are connected together along the length direction of the rock template.
Illustratively, step S201 is implemented by:
1.1: and determining the volume ratio between the dolomite rock plate and the limestone rock plate according to the logging data.
In the implementation manner, in order to further ensure that the rock template can simulate the stratum structure of complex lithology in the oil reservoir more vividly, the volume ratio of the dolomite rock plate and the limestone rock plate can be determined according to the test data and the interpretation result of specific logging or logging in the oil reservoir.
1.2: providing a dolomite rock plate and a limestone rock plate according to the volume ratio.
Illustratively, the dolomitic and limestone slabs are the same thickness and width.
Because the thickness and the width of the dolomite slab and the limestone slab in the application are the same, the dolomite slab and the limestone slab can have different volume ratios as long as the thickness and the width are the same and are adjusted in the length direction.
1.3: the dolomitic rock plate and the limestone rock plate are bonded together through a bonding agent.
In the implementation mode, the dolomite rock plate and the limestone rock plate can be conveniently bonded together through the binder so as to obtain the rock plate sample plate formed by the dolomite and the limestone, and the rock plate sample plate has complex lithology and can vividly simulate a complex stratum.
Fig. 3 is a schematic structural diagram of a rock template provided in an embodiment of the present disclosure, and with reference to fig. 3, the rock template includes a dolomite rock plate 1 and a limestone rock plate 2, and one side of the dolomite rock plate 1 is connected to one side of the limestone rock plate 2.
S202: and etching network cracks on the rock template, wherein the network cracks comprise a plurality of main cracks and a plurality of micro cracks, and the width of the main cracks is larger than that of the micro cracks.
Illustratively, step S202 is implemented by:
2.1: and determining the initial width of the main fracture and the initial width of the microcracks according to the formation microresistivity scanning imaging logging result.
In the above implementation, in order to enable the main fractures and the micro fractures in the rock template to simulate natural fractures in the formation vividly, first, how wide the main fractures and how wide the micro fractures need to be etched in the rock template are determined, that is, the initial widths of the main fractures and the micro fractures are determined.
The formation microresistivity scanning imaging well logging technology is an important well wall imaging method, and the technology is characterized in that a plurality of rows of button-shaped small electrodes on a multi-polar plate are utilized to emit current to a well wall formation. Due to different rock compositions, structures and contained fluids contacted by the electrodes, current changes are caused, the changes of the current reflect the changes of the resistivity of the rock at all positions of the well wall, and accordingly well wall imaging of the resistivity can be displayed. By combining the technical means, the initial width of the corresponding main fracture and the initial width of the micro fracture in the reservoir can be determined.
2.2: and etching main cracks and micro cracks on the surface of the rock plate sample plate.
In the above implementation, the main cracks and the micro cracks may be directly etched on the face of the rock sample plate by the nicking tool.
It should be noted that, when etching the main cracks and the micro cracks, it is required to ensure that the initial widths of the main cracks and the micro cracks both meet the actual requirements.
Nicking tools are typically specialized cutting tools.
In this embodiment, the rock plate template may be a long rock plate with a length of 20cm and a width of 6.5cm, as shown in fig. 3.
Wherein the initial width of the main slit (103 in FIG. 3) is 3mm and the initial width of the micro slit (104 in FIG. 3) is 1 mm. One side of the rock plate template has an inlet 101, the inlet 101 for introducing acid into the rock plate template and an outlet 102 for acid to flow out of the rock plate template.
Namely, the preparation of the rock template can be completely referred according to the natural fracture development condition of the reservoir, for example, the natural fracture of the Tahe fracture type reservoir has the characteristics of large density (more than 20/m), large size (mainly 1-3 mm in width) and large angle (medium-high angle fracture development), and a special cutting tool is used for preparing a reticular fracture model on the rock plate made of the large-size stratum core in combination with the natural fracture development condition of the Tahe fracture type reservoir.
In this embodiment, when network cracks are etched on the rock plate sample plate, the main cracks extend along the length direction of the rock plate sample plate, and the micro cracks are located on two opposite sides of the main cracks and are communicated with the main cracks. It can be understood that the above design manner of the main cracks and the micro cracks may be other manners, and the specific design manner may be set according to actual situations, for example, the main cracks are arranged along the length and width directions of the rock template, the micro cracks are arranged at the periphery of the main cracks, and the like, which is not limited by the comparison of the present disclosure.
S203: and weighing the rock template, and recording the weighing result as the mass before detection.
In the implementation mode, the mass of the rock sample plate before acid injection, namely the mass before detection can be accurately weighed through the electronic balance.
S204: providing acid liquor, and pretreating the acid liquor.
Step S204 can be implemented by:
the gelling agent, the iron ion stabilizer, the corrosion inhibitor, the corrosion inhibition synergist, the cleanup additive and the clay stabilizer are added into the acid liquor, so that the acid liquor to be detected is uniform from top to bottom without fish eyes.
Wherein the gelling agent is capable of gradually converting the acid solution into a homogeneous semi-rigid solid gel and retaining its original shape.
The iron ion stabilizer can effectively complex free iron ions to form stable iron complex ions, so that secondary precipitation is avoided.
The corrosion inhibitor can prevent or slow down the corrosion of the material.
The discharge assistant is a chemical product capable of helping the working residual liquid in the processes of acidification, fracturing and the like to flow back from the stratum.
The clay stabilizer can be effectively adsorbed on the surface of clay, and the damage to an oil-gas layer caused by hydration expansion and dispersion migration of water-sensitive minerals is prevented.
In the implementation mode, the gelling agent, the iron ion stabilizer, the corrosion inhibitor, the corrosion inhibition synergist, the cleanup additive and the clay stabilizer are added into the acid liquor, so that the acid liquor is consistent with the acid liquor used in the actual acid fracturing process, namely the acid injection process in the actual stratum is simulated as truly as possible, and the acid liquor is even up and down without fish eyes.
The acid solution may be common hydrochloric acid, and the gelling agent, the iron ion stabilizer, the corrosion inhibitor, the corrosion inhibition synergist, the cleanup additive, the clay stabilizer and the like added in the hydrochloric acid may be added in different amounts according to different mass fractions of different components.
S205: acid is injected into the rock plate template.
Step S205 is implemented by:
5.1: providing a dynamic fluid loss evaluator;
5.2: and injecting acid liquor into the rock template by using the dynamic fluid loss evaluation instrument.
In the implementation mode, the dynamic fluid loss evaluation instrument comprises a pressurization system, an instrument system, a rock plate clamping system and a liquid drainage system. The rock plate clamping system is used for clamping the rock plate in the dynamic fluid loss evaluation instrument.
Acid liquor can be conveniently injected into the rock sample plate through the dynamic fluid loss evaluation instrument, so that the acid liquor fluid loss of the rock sample plate to the acid liquor can be conveniently detected.
In this example, acid was injected into the template at a constant rate by a dynamic fluid loss estimator.
S206: and weighing the rock plate sample plate after the acid liquor is injected, and recording the weight of the rock plate sample plate after detection.
In the implementation mode, the quality of the rock plate sample plate after detection, namely the final quality, can be accurately weighed through the electronic balance.
S207: and determining the rock core corrosion rate of the rock template by the quality before and after detection.
Step S207 is implemented by:
the rock core corrosion rate of the rock plate sample plate meets the following formula:
wherein eta is the core corrosion rate of the rock template sample plate; m1For the pre-examination quality of the rock sample plate, M2And (5) detecting the quality of the rock template before detection.
S208: and scanning the rock template to determine the width change of the main crack and the width change of the micro-crack.
Step S208 is implemented by:
firstly, providing a three-dimensional scanner;
and secondly, scanning the rock plate sample plate through a three-dimensional scanner to determine the final width and the final width of the microcracks.
And then, obtaining the width difference of the main crack according to the initial width and the final width of the main crack.
And finally, obtaining the width difference of the microcracks according to the initial width and the final width of the microcracks.
S209: and determining the acid fluid filtration performance of the rock plate sample plate according to the rock core corrosion rate of the rock plate sample plate, the width change of the main cracks and the width change of the micro cracks.
Generally, the larger the rock core corrosion rate of the rock plate sample plate is, the stronger the acid liquor filtration capacity of the rock plate sample plate is;
on the contrary, if the core corrosion rate of the rock sample plate is smaller, the acid fluid filtration capacity of the rock sample plate is weak.
The three-dimensional scanner may be a CT scanning technique.
Through the scanning technology, the change condition of the reticular fracture in the reservoir before and after the acid liquid is injected can be analyzed by combining a digital method, so that the filtration loss mechanism of the acid liquid in the natural fracture network can be further and deeply known.
Of course, the volume change of the reticular cracks before and after the acid liquid is injected can be scanned through a three-dimensional scanning technology, the volumes of the eroded rocks corresponding to the main cracks and the micro cracks can be obtained through scanning, and the fact that more acid liquid enters the main cracks or more acid liquid enters the micro cracks can be further judged in an auxiliary mode.
The following describes the specific process of the above detection method with reference to specific examples:
the method takes an X oil field Y well reservoir as a research object, and acid liquor filtration detection is carried out on the reservoir by adopting the detection method according to the following steps:
the first step is as follows: and preparing a rock plate sample plate, wherein the specification of the rock plate sample plate can be a long rock plate with the length of 20cm and the width of 6.5 cm.
And moreover, a combination mode of the dolomite and the limestone is adopted, namely the dolomite and the limestone are spliced to form the cement mortar.
According to the logging and logging data and the interpretation result thereof, the volume of the dolomite rock plate accounts for 30 percent, and the volume of the limestone rock plate accounts for 60 percent.
And then, a nicking tool is adopted to carve main cracks and micro cracks on the rock template, wherein the initial width of the main cracks is 3mm, and the initial width of the micro cracks is 1mm, which is determined according to the well stratum micro resistivity scanning imaging logging result.
The second step is as follows: preparing the acid solution for experiments.
Preparing acid liquor according to the mass fractions of the additives, wherein the specific proportion of the acid liquor is as follows:
20% of HCl, 0.45% of gelling agent, 2% of iron ion stabilizer, 3% of corrosion inhibitor, 1% of corrosion inhibition synergist, 1% of cleanup additive and 1% of clay stabilizer.
The third step is as follows: the prepared template was placed on an electronic balance and weighed the mass of the template before acid injection, which was 100 g.
The fourth step is as follows: and directly putting the prepared rock sample plate into a dynamic fluid loss evaluation instrument, injecting the prepared acid liquid into the rock sample plate at an injection speed of 30ml/min, and stopping injection after 300ml of acid liquid is injected.
The fifth step: and weighing the mass of the rock plate sample plate after the acid liquid is injected by using an electronic balance, wherein the mass of the rock plate sample plate after the acid liquid is injected is 72 g.
The sixth step: and calculating the rock core corrosion rate according to the mass of the rock plate sample plate before and after acid injection.
And judging the acid liquor filtration condition of the rock plate sample plate according to the rock core corrosion rate, and finally obtaining the rock plate sample plate with the corrosion rate reaching 28%.
The seventh step: and scanning the tested rock template by using a three-dimensional laser scanner.
From the scanning results, it can be known that the width of the main crack is changed from 3mm to 5.8mm, and the width of the micro-crack is changed from 1mm to 1.6mm, which indicates that the acid solution for the test is easier to enter the wide main crack for filtration, and the filtration loss in the micro-crack is small.
Therefore, according to the method, acid fluid loss evaluation can be performed on the complex lithologic fractured reservoir, meanwhile, the influence of the fractures on the fluid loss can be considered, the operation is simple and convenient, and the pertinence and the effect of the acid fracturing design of the complex lithologic fractured reservoir are greatly improved.
In addition, as the rock template sample plate is manufactured by the dolomite rock plate and the limestone rock plate, the reservoir with complex lithology can be simulated, meanwhile, the influence of the fracture on the fluid loss is considered, and finally, the detection of the acid fluid loss performance of the reservoir with complex lithology and fracture is realized.
In addition, during detection, the filtration performance of the rock plate sample to be detected is judged directly according to the mass difference of the rock plate sample before and after acid injection, so that the phenomenon that the filtration performance of the acid liquor in the reservoir is determined through direct sizing and rough judgment due to direct observation of naked eyes is avoided.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A method for detecting acid fluid loss performance of a reservoir, the method comprising:
preparing a rock sample plate, wherein the rock sample plate comprises a dolomite rock plate and a limestone rock plate which are connected together along the length direction of the rock sample plate;
etching network cracks on the rock plate sample plate, wherein the network cracks comprise a plurality of main cracks and a plurality of micro cracks, and the width of the main cracks is larger than that of the micro cracks;
weighing the rock template, and recording the weighing result as the mass before detection;
providing acid liquor, and injecting the acid liquor into the rock template;
weighing the rock plate sample plate injected with the acid liquor, and recording the weighing result as the detected mass;
determining the rock core corrosion rate of the rock template according to the mass before detection and the mass after detection;
and determining the acid liquor filtration performance of the rock plate sample plate according to the rock core corrosion rate of the rock plate sample plate.
2. The method of testing as defined in claim 1, wherein said preparing a rock plate template comprises:
determining the volume ratio between the dolomite rock plate and the limestone rock plate according to the logging data;
providing the dolomite rock plate and the limestone rock plate according to the volume ratio;
and bonding the dolomite slab and the limestone slab together through a bonding agent.
3. The method of inspection as in claim 1, wherein the etching network fractures in the rock plate template comprises:
scanning an imaging logging result according to the formation micro-resistivity, and determining the initial width of the main fracture and the initial width of the micro-fracture;
and etching the main cracks and the micro cracks on the surface of the rock plate sample plate.
4. The method of testing as claimed in claim 1 wherein said injecting said acid into said rock template comprises:
providing a dynamic fluid loss evaluator;
and injecting the acid liquor into the rock template through the dynamic fluid loss evaluation instrument.
5. The method of testing as claimed in claim 1 wherein said injecting said acid into said rock template comprises:
injecting the acid solution into the rock plate template at a constant rate.
6. The method of testing as defined in claim 1, wherein said determining a core erosion rate of the rock template from the pre-test mass and the post-test mass comprises:
the rock core corrosion rate of the rock plate sample plate meets the following formula:
wherein eta is the core corrosion rate of the rock template; m1For the pre-examination mass of the rock sample plate, M2And detecting the quality of the rock plate sample plate before detection.
7. The detection method according to claim 1, wherein after the providing the acid solution, the detection method further comprises:
adding gelling agent, iron ion stabilizer, corrosion inhibitor, corrosion inhibition synergist, cleanup additive and clay stabilizer into the acid liquor.
8. The inspection method of claim 1, wherein after determining a core erosion rate of the template, the inspection method further comprises:
and scanning the rock plate sample plate, and determining the width change of the main crack and the width change of the micro-crack.
9. The method of claim 8, wherein scanning the template to determine the width variation of the primary fractures and the width variation of the microfractures comprises:
providing a three-dimensional scanner;
scanning the rock template sample plate through the three-dimensional scanner to determine the final width and the final width of the microcracks;
obtaining a width difference value of the main crack according to the initial width and the final width of the main crack;
and obtaining the width difference of the microcracks according to the initial width and the final width of the microcracks.
10. The detection method according to claim 1, wherein the acid solution is hydrochloric acid.
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