CN112431570B - Test method of temporary plugging agent for temporary plugging of acid fracturing - Google Patents
Test method of temporary plugging agent for temporary plugging of acid fracturing Download PDFInfo
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The disclosure provides a test method of a temporary plugging agent for temporary plugging of acid fracturing, and belongs to the technical field of oil and gas field development engineering. The test method comprises the following steps: determining the width range of the seam, and providing temporary plugging agents of different types; detecting degradation amounts of various temporary plugging agents, and screening the temporary plugging agents based on the degradation amounts, so that the degradation amount of the screened temporary plugging agents is not more than 20% of the weight of the temporary plugging agents; providing a plurality of steel plates, and splicing the plurality of steel plates together in pairs, so that gaps with different widths are respectively formed between two adjacent steel plates, wherein the width of each gap is not more than the width range of each gap; and injecting the screened temporary plugging agents into the gaps with different widths one by one respectively to determine the actual temporary plugging pressure of the different temporary plugging agents. The method can effectively guide temporary blocking construction of the deep well seam so as to achieve temporary blocking success rate.
Description
Technical Field
The disclosure belongs to the technical field of oil and gas field development engineering, and particularly relates to a test method of a temporary plugging agent for temporary plugging of acid pressure.
Background
After many oil fields are built soon, because stratum energy is exhausted, a large number of oil and gas wells are subjected to fracturing construction transformation so as to open new cracks of reservoirs, and a good oil and gas yield increasing effect is obtained. Many old oil fields enter a high-water-content period development stage, and a crack occurrence steering technology is provided as a comprehensive treatment measure for the old oil fields. The technique refers to a repeated fracturing technique that plugs are formed in original cracks to reach a certain breaking pressure and then new cracks are opened along other directions. The most effective method of the repeated fracturing technology is to plug old cracks by using temporary plugging materials, then to inject fracturing fluid to fracture the stratum again, and to open new cracks in the direction with a certain included angle with the old cracks, so that the crude oil yield can be increased, and the water yield of an oil field can be reduced. The technology is also called a steering acid fracturing technology or a temporary plugging acid fracturing technology (namely temporary plugging acid fracturing), and has very important significance for oil field yield improvement.
In the related art, in order to make the construction effect of temporary plugging acid fracturing better, it is generally necessary to perform a related temporary plugging acid fracturing test before temporary plugging construction is performed. The specific process of the temporary plugging acid fracturing test is as follows: and directly injecting the prepared temporary plugging agent into the simulated fracture, and then detecting the temporary plugging effect of the temporary plugging agent.
However, in the temporary plugging acid fracturing test, the temporary plugging agent is directly injected into the crack to perform the acid fracturing test, that is, the temporary plugging agent is not optimized, so that most temporary plugging agents used in the test process can not effectively plug the simulated crack, and finally the temporary plugging acid fracturing cannot be effectively guided.
Disclosure of Invention
The embodiment of the disclosure provides a test method of temporary plugging agent for temporary plugging acid pressure, which can effectively guide temporary plugging construction of deep well seam so as to improve the temporary plugging success rate. The technical scheme is as follows:
the embodiment of the disclosure provides a test method of a temporary plugging agent for temporary plugging of acid fracturing, which comprises the following steps:
determining the width range of a seam, wherein the seam is a seam of a crack formed in temporary plugging acid fracturing construction of a deep well to be acid-fracturing;
providing different kinds of temporary plugging agents;
detecting degradation amounts of various temporary plugging agents, wherein the degradation amounts are weight reduction values of the temporary plugging agents in construction time, and the construction time is time required by temporary plugging acid pressure construction;
screening the temporary plugging agent based on the degradation amount, so that the degradation amount of the screened temporary plugging agent is not more than 20% of the self weight;
providing a plurality of steel plates, and splicing the plurality of steel plates together in pairs, so that gaps with different widths are respectively formed between two adjacent steel plates, wherein the width of each gap is not more than the width range of each gap;
and injecting the screened temporary plugging agents into the gaps with different widths one by one respectively to determine the actual temporary plugging pressure of the different temporary plugging agents.
In yet another implementation of the present disclosure, the detecting degradation amounts of the various temporary plugging agents includes:
determining construction time;
determining a reservoir temperature corresponding to the seam;
placing the temporary plugging agent in clear water, and recording the degradation amount of the temporary plugging agent in the clear water within the construction time, wherein the temperature of the clear water is the reservoir temperature;
and placing the temporary plugging agent in acid liquor with the reservoir temperature, and recording the degradation amount of the temporary plugging agent in the acid liquor within the construction time, wherein the temperature of the acid liquor is the reservoir temperature.
In yet another implementation of the present disclosure, the determining the width range of the slit includes:
determining construction parameters of the deep well to be acid-pressed in the temporary plugging acid-pressing construction;
simulating the widths of a plurality of slits corresponding to a plurality of different cracks formed in the temporary plugging acid fracturing construction of the deep well to be acid-fracturing through fracturing software according to the construction parameters;
and obtaining the width range of the seam according to different widths of the seam.
In yet another implementation of the present disclosure, the providing a heterogeneous temporary plugging agent includes:
the temporary plugging agent is at least one of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles.
In yet another implementation of the present disclosure, the expansion factor of the expandable temporary plugging particles is 3-6 times, the length of the water-soluble temporary plugging fibers is 2-8mm, the mesh number of the soluble resin particles is 20-40 mesh, and the mesh number of the water-soluble temporary plugging particles is 20-30 mesh.
In yet another implementation manner of the present disclosure, the injecting the screened temporary plugging agents into the gaps with different widths one by one to determine actual temporary plugging pressures of the temporary plugging agents includes:
sequentially injecting different temporary plugging agents into the gaps with the same width, and plugging and pressure testing the gaps;
and sequentially injecting the same temporary plugging agent into the gaps with different widths, and plugging and pressure testing the gaps.
In yet another implementation manner of the present disclosure, after the screened temporary plugging agents are respectively injected into the gaps with different widths one by one to determine the actual temporary plugging pressures of the different temporary plugging agents, the test method further includes:
calculating the target temporary plugging pressure of the joint according to logging data, wherein the target temporary plugging pressure refers to a pressure value required to be born in temporary plugging acid pressure construction after the joint is plugged by the temporary plugging agent;
and carrying out secondary screening on the temporary plugging agent based on the actual temporary plugging pressure of the temporary plugging agent and the target temporary plugging pressure of the seam, so that the temporary plugging agent after the secondary screening meets the temporary plugging acid pressure construction.
In yet another implementation of the present disclosure, the calculating the target temporary plugging pressure of the seam according to logging data includes:
according to the logging data, calculating to obtain the primary fracture stress of the reservoir when the fracture is formed for the first time in the deep well to be acid-pressed and the secondary fracture stress of the reservoir when the fracture is formed again, wherein the primary fracture stress refers to the reservoir fracture stress corresponding to the first time when the temporary plugging acid is pressed, and the secondary fracture stress refers to the stratum fracture stress corresponding to the subsequent fracture is formed when the temporary plugging acid is pressed;
and calculating the target temporary plugging pressure of the seam based on the primary fracture stress and the secondary fracture stress.
In yet another implementation of the present disclosure, the calculating the target temporary plugging pressure of the seam based on the primary fracture stress and the secondary fracture stress includes:
and taking the difference value of the secondary fracture stress and the primary fracture stress as the target temporary plugging pressure of the seam.
In yet another implementation of the present disclosure, performing a secondary screening of the temporary plugging agent based on an actual temporary plugging pressure of the temporary plugging agent and a target temporary plugging pressure of the seam includes:
the actual temporary plugging pressure of the temporary plugging agent after the secondary screening is not smaller than the target temporary plugging pressure of the seam.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
according to the test method provided by the embodiment of the disclosure, the width range of the formed seam in the temporary plugging acid fracturing construction of the deep well to be acid fracturing is determined, so that the width of the formed seam in the test process can be guided better according to the width range. Then, the temporary plugging agent is screened according to the degradation amount of the temporary plugging agent, so that the temporary plugging agent used in the experiment can be ensured to be satisfactory, and the temporary plugging agent is selected blindly because the actual performance of the temporary plugging agent is not known, so that the temporary plugging acid fracturing test fails, and financial resources and the like are wasted. Then, gaps are formed through the steel plates, so that actual gaps can be effectively simulated through the gaps, and gaps with different widths are formed, so that the test method can simulate the gaps with different sizes, and the test accuracy is improved. And finally, injecting the screened temporary plugging agent into a gap of the steel plate, and providing technical guidance for the subsequent actual temporary plugging acid pressure according to the actual temporary plugging pressure of the temporary plugging agent.
In the temporary plugging acid fracturing test method provided by the embodiment of the disclosure, the width of the gap formed by the steel plate is adjustable, so that the simulation test can be performed on the gaps with different sizes, and the gap is closer to the actual gap. Moreover, the degradation amount of the temporary plugging agent is detected, so that the use efficiency and the temporary plugging success rate of the temporary plugging agent can be greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a test method for temporary plugging agent for temporary plugging of acid fracturing provided in an embodiment of the present disclosure;
FIG. 2 is a flow chart of another test method for temporary plugging agent for temporary plugging of acid fracturing provided in an embodiment of the present disclosure;
fig. 3 is a graph showing the effect of detecting the actual temporary plugging pressure by combining temporary plugging agents.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
The embodiment of the disclosure provides a test method of a temporary plugging agent for temporary plugging of acid fracturing, as shown in fig. 1, the test method comprises the following steps:
s101: determining the width range of a seam, wherein the seam is a seam of a crack formed in temporary plugging acid fracturing construction of a deep well to be acid-fracturing;
s102: providing different kinds of temporary plugging agents;
s103: detecting degradation amount of various temporary plugging agents, wherein the degradation amount is a weight reduction value of the temporary plugging agents in construction time, and the construction time is time required by temporary plugging acid pressure construction;
s104: screening the temporary plugging agent based on the degradation amount, so that the degradation amount of the screened temporary plugging agent is not more than 20% of the self weight;
s105: providing a plurality of steel plates, and splicing the plurality of steel plates together in pairs, so that gaps with different widths are respectively formed between two adjacent steel plates, and the width of each gap does not exceed the width range of each gap.
S106: and injecting the screened temporary plugging agents into gaps with different widths one by one respectively to determine the actual temporary plugging pressure of different temporary plugging agents.
According to the temporary plugging acid fracturing test method provided by the embodiment of the disclosure, the width range of the formed seam in the temporary plugging acid fracturing construction of the deep well to be acid fracturing is determined, so that the width of the formed seam in the test process can be better guided according to the width range. Then, the temporary plugging agent is screened according to the degradation amount of the temporary plugging agent, so that the temporary plugging agent used in the experiment can be ensured to be satisfactory, and the temporary plugging agent is selected blindly because the actual performance of the temporary plugging agent is not known, so that the temporary plugging acid fracturing test fails, and financial resources and the like are wasted. Then, gaps are formed through the steel plates, so that actual gaps can be effectively simulated through the gaps, and gaps with different widths are formed, so that the test method can simulate the gaps with different sizes, and the test accuracy is improved. And finally, injecting the screened temporary plugging agent into a gap of the steel plate, and providing technical guidance for the subsequent actual temporary plugging acid pressure according to the actual temporary plugging pressure of the temporary plugging agent.
In the temporary plugging acid fracturing test method provided by the embodiment of the disclosure, the width of the gap formed by the steel plate is adjustable, so that the simulation test can be performed on the gaps with different sizes, and the gap is closer to the actual gap. Moreover, the degradation amount of the temporary plugging agent is detected, so that the use efficiency and the temporary plugging success rate of the temporary plugging agent can be greatly improved.
Fig. 2 is a flowchart of another test method for temporary plugging agent for temporary plugging of acid fracturing provided in an embodiment of the present disclosure, and in combination with fig. 2, the test method includes:
s201: the width of the slit is determined.
Step S201 is implemented by:
firstly, determining construction parameters of a deep well to be acid-pressed in temporary plugging acid-pressing construction.
And then simulating the widths of a plurality of slits corresponding to a plurality of different cracks formed in temporary plugging acid fracturing construction of the deep well to be acid-fracturing through fracturing software according to the construction parameters.
Illustratively, the fracturing software may be fracturing specialty simulation software such as fracpro, stimplan, meyer.
Finally, according to the different widths of the slits, the width range of the slits is obtained.
In the implementation mode, the deep well to be acid pressed can be effectively simulated through the fracturing professional software, and the widths of the corresponding seams under different injection displacement (namely construction parameters) can be recorded, so that the width range of the seam can be determined according to the maximum value and the minimum value in the different seam widths, and the setting of the width of the seam formed by the steel plate in the test process can be better guided through the width range of the seam.
S202: different kinds of temporary plugging agents are provided.
Illustratively, the temporary plugging agent is at least one of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles, and water-soluble temporary plugging particles.
In this embodiment, the expansion factor of the expandable temporary plugging particles is 3-6 times.
The length of the water-soluble temporary plugging fiber is 2-8mm.
The soluble resin particles have a mesh number of 20 to 40 mesh.
The mesh number of the water-soluble temporary plugging particles is 20-30 meshes.
And if one of the temporary plugging agents, namely the temporary plugging agent with a single component, is selected, the adding amount of the temporary plugging agent in the carrying liquid can be 0.6-1.6wt%.
If two or more of the temporary plugging agents, namely, the temporary plugging agents composed of a plurality of components are selected, the adding amount of the temporary plugging agents in the carrying liquid can be 1.2-3.2wt%.
S203: detecting degradation amount of various temporary plugging agents, wherein the degradation amount is a weight reduction value of the temporary plugging agents in construction time, and the construction time is time required by temporary plugging acid fracturing construction.
Step S203 is implemented by:
firstly, determining construction time;
next, the reservoir temperature corresponding to the seam is determined.
In the implementation manner, because the temporary plugging agent injected in the temporary plugging acid fracturing construction process can enter the reservoir along with the carrying liquid, and the corresponding temperatures in the reservoir are different due to different depths. Therefore, in order to more accurately detect the degradation amount of the temporary plugging agent, it is necessary to first check the reservoir temperature.
Then, placing the temporary plugging agent in clear water, and recording the degradation amount of the temporary plugging agent in the clear water within the construction time, wherein the temperature of the clear water is the reservoir temperature.
And then, placing the temporary plugging agent into acid liquor with the reservoir temperature, and recording the degradation amount of the temporary plugging agent in the acid liquor within the construction time, wherein the temperature of the acid liquor is the reservoir temperature.
In the implementation manner, the temporary plugging agent is placed in the acid liquor and the clear water, and the degradation amount of the temporary plugging agent is detected respectively, so that the degradation amount of the temporary plugging agent entering a reservoir in temporary plugging acid fracturing construction can be determined approximately, and the proper temporary plugging agent is optimized, so that the temporary plugging success rate is improved.
S204: and screening the temporary plugging agent based on the degradation amount, so that the degradation amount of the screened temporary plugging agent is not more than 20% of the self weight.
In the embodiment, the degradation amount of the temporary plugging agent in the clean water and the degradation amount of the temporary plugging agent in the acid liquor are not more than 20% of the weight of the temporary plugging agent.
In the implementation manner, the degradation rate of the temporary plugging agent can be effectively determined by controlling the degradation amount of the temporary plugging agent, so that the success rate of subsequent temporary plugging acid fracturing construction is ensured.
Illustratively, in this embodiment, the acid solution may be a hydrochloric acid solution containing 20% by mass or other strong acid solution.
Of course, the acid liquor can be selected according to the specific actual conditions in the specific temporary plugging acid fracturing construction, and can also be acid liquor with other mass fractions.
S205: providing a plurality of steel plates, and splicing the plurality of steel plates together in pairs, so that gaps with different widths are respectively formed between two adjacent steel plates, and the width of each gap does not exceed the width range of each gap.
Illustratively, the width of the gap may be obtained in particular by:
obtaining an average value corresponding to the plurality of slits according to the plurality of widths corresponding to the plurality of slits; the width of the gap can then be determined from the average value.
In this embodiment, the width of the slit may be an average value of-1/4 of the slit average value, an average value, and an average value of +1/4 of the slit average value.
Of course, the above selection is not limited.
S206: and injecting the screened temporary plugging agents into gaps with different widths one by one respectively to determine the actual temporary plugging pressure of different temporary plugging agents.
The actual temporary plugging pressure of the temporary plugging agent refers to the pressure value born by the temporary plugging agent in the test process after the gap of the steel plate is plugged by the temporary plugging agent.
Step S206 is implemented by:
firstly, sequentially injecting different temporary plugging agents into gaps with the same width, and plugging and pressure testing the gaps.
In this embodiment, the width of the gap is set to be 0.8cm, and the temporary plugging agent may be: expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles.
And the expansion times of the expandable temporary plugging particles are 3-6 times, the length of the water-soluble temporary plugging fibers is 2-9mm, the soluble resin particles are 20-40 meshes, the water-soluble temporary plugging particles are 20-40 meshes, and the addition amount of each temporary plugging agent is 0.6-1.6wt%.
The test and comparison show that the water-soluble temporary plugging fibers and the water-soluble temporary plugging particles can effectively plug the gaps, but the plugging duration is short.
The temporary plugging agent can also be mixed, and two or more of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles can be adopted for testing.
When mixing, the expansion times of the expandable temporary plugging particles are 3-6 times, the length of the water-soluble temporary plugging fibers is 2-9mm, the soluble resin particles are 20-40 meshes, and the water-soluble temporary plugging particles are 20-40 meshes. The addition amount of the combined temporary plugging agent is 1.2-3.2wt%.
Fig. 3 is a graph showing the effect of detecting the actual temporary plugging pressure of the combined temporary plugging agent, and the experiment shows that 1wt% of water-soluble temporary plugging fibers and 1.5% of water-soluble temporary plugging particles can realize effective plugging for more than 20min, the actual temporary plugging pressure of the temporary plugging agent is about 16MPa, and after more than 40 min, the temporary plugging agent is basically invalid.
And sequentially injecting the same temporary plugging agent into gaps with different widths, and plugging and pressure testing the gaps.
The different widths of the slit may be set as follows: 0.6cm,0.8cm,1.0cm.
The temporary plugging agent is selected from two or more of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles, and the addition amount of the temporary plugging agent is 1.2-3.6wt%.
And respectively carrying out pressure bearing detection on the blocked steel plates.
The combined temporary plugging agent formula for different seam widths can be optimized through experiments.
By the method, the range of the variation of the crack width in the acid fracturing process is clarified, and the temporary plugging formula of a single temporary plugging agent and a combined temporary plugging agent can be provided for different crack widths in the range, so that temporary plugging and temporary acid fracturing construction is effectively guided.
S207: according to logging data, calculating to obtain target temporary plugging pressure of the joint, wherein the target temporary plugging pressure refers to a pressure value required to be born in temporary plugging acid pressure construction after the joint is plugged by the temporary plugging agent.
Step S207 may be implemented by:
firstly, according to logging data, calculating to obtain the primary fracture stress of the reservoir when the fracture is formed in the deep well to be acid pressed for the first time and the secondary fracture stress of the reservoir when the fracture is formed again.
The primary fracture stress refers to the fracture stress of the reservoir corresponding to the first formation of cracks in the reservoir during temporary plugging acid fracturing. The re-fracture stress refers to the stratum fracture stress corresponding to the subsequent formation of the reservoir layer during temporary plugging acid fracturing.
Then, based on the primary fracture stress and the secondary fracture stress, the target temporary plugging pressure of the obtained seam is calculated.
Illustratively, the difference between the secondary fracture stress and the primary fracture stress is taken as the target temporary plugging pressure for the seam.
S208: and (3) carrying out secondary screening on the temporary plugging agent based on the actual temporary plugging pressure of the temporary plugging agent and the target temporary plugging pressure of the joint, so that the temporary plugging agent after the secondary screening meets the temporary plugging acid pressure construction.
The temporary plugging pressure of the temporary plugging agent after the secondary screening is not smaller than the target temporary plugging pressure of the seam, namely the temporary plugging pressure of the temporary plugging agent is not smaller than the difference value of the secondary fracture stress and the primary fracture stress.
In the implementation manner, through the method, whether the actual temporary plugging performance of the temporary plugging agent meets the requirement of actual temporary plugging acid fracturing construction or not can be effectively determined, so that a judgment basis is provided for the actual temporary plugging acid fracturing construction.
The following describes the above test methods in detail with reference to specific examples:
taking an X oilfield Y well reservoir as a research object, and adopting the test method provided by the embodiment of the disclosure to test the temporary plugging acid pressure of the deep well seam according to the following steps:
a first step of: and simulating different cracks formed in the deep well temporary plugging acid fracturing construction process by adopting fracturing software, determining the width of the seam of the different cracks, and determining the variation range of the width of the seam to be 0.6-1.0cm.
And a second step of: according to the variation range of the width of the seam, a plurality of steel plates are utilized, so that the width of a gap formed between two adjacent steel plates is not more than 0.6-1.0cm.
And a third step of: and determining that the temperature of the corresponding reservoir layer forming the crack in temporary plugging acid fracturing construction is 140 ℃.
Screening a plurality of temporary plugging agents, and finally determining a plurality of different temporary plugging agents (including expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles), wherein the complete dissolution time of the temporary plugging agents in acid liquor at the reservoir temperature of 140 ℃ is about 4 hours.
The complete dissolution time of the aqueous solution of the temporary plugging agent at the reservoir temperature of 140 ℃ is about 8 hours.
When the degradation amount of the temporary plugging agent in the acid liquid or the aqueous solution reaches 20% of the self weight, the corresponding time is 1.5 hours, and the time is longer than the construction time, which indicates that the basic requirement of temporary plugging acid fracturing construction can be met.
Fourth step: in combination with the second step, the width of one of the slits was made 0.8cm.
And sequentially injecting the screened temporary plugging agents into the gaps, and detecting the actual temporary plugging pressure of each temporary plugging agent.
In the selected temporary gambling agent, the expansion times of the expandable temporary plugging particles are 3-6 times, the length of the water-soluble temporary plugging fibers is 2-9mm, the soluble resin particles are 20-40 meshes, and the water-soluble temporary plugging particles are 20-40 meshes.
The addition amount of each temporary plugging agent is 0.6-1.6wt%.
The final test results show that: the water-soluble temporary plugging fibers and the water-soluble temporary plugging particles can realize effective plugging, but the plugging duration is short.
Fifth step: the gap width was again adjusted to 0.8cm, and two or more of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles, and water-soluble temporary plugging particles were used for the test.
The expansion times of the expandable temporary plugging particles are 3-6 times, the length of the water-soluble temporary plugging fibers is 2-9mm, the soluble resin particles are 20-40 meshes, the water-soluble temporary plugging particles are 20-40 meshes, and the addition amount of the combined temporary plugging agent is 1.2-3.2wt%.
Experiments show that 1wt% of water-soluble temporary plugging fibers and 1.5% of water-soluble temporary plugging particles can realize effective plugging for more than 20 minutes, and the actual temporary plugging pressure of the temporary plugging agent is about 16MPa.
Sixth step: the width of the gap was selected to be 0.6cm,0.8cm,1.0cm, respectively.
The adopted combined temporary plugging agent is a mixture of two or more of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles.
The addition amount of the combined temporary plugging agent is 1.2-3.6wt%.
The combined temporary plugging agent formula for different gap widths can be optimized through experiments.
By the method, the variation range of the crack width in the temporary plugging acid fracturing process is clarified, a temporary plugging formula of a single temporary plugging agent and a combined temporary plugging agent can be provided for different crack widths in the range, temporary plugging acid fracturing construction is effectively guided, and the temporary plugging success rate of temporary plugging acid fracturing is improved.
The foregoing is merely an alternative embodiment of the present disclosure, and is not intended to limit the present disclosure, any modification, equivalent replacement, improvement, etc. that comes within the spirit and principles of the present disclosure are included in the scope of the present disclosure.
Claims (6)
1. A test method of a temporary plugging agent for temporary plugging of acid fracturing, characterized in that the test method comprises the following steps:
determining construction parameters of a deep well to be acid-pressed in temporary plugging acid-pressing construction, simulating the widths of a plurality of slits corresponding to a plurality of different cracks formed in the temporary plugging acid-pressing construction by using fracturing software according to the construction parameters, and obtaining the width range of the slits according to the maximum value and the minimum value of the widths of the different slits, wherein the slits are slits of the cracks formed in the temporary plugging acid-pressing construction by the deep well to be acid-pressed;
providing different types of temporary plugging agents, wherein the temporary plugging agents are at least one of expandable temporary plugging particles, water-soluble temporary plugging fibers, soluble resin particles and water-soluble temporary plugging particles, the expansion times of the expandable temporary plugging particles are 3-6 times, the length of the water-soluble temporary plugging fibers is 2-8mm, the mesh number of the soluble resin particles is 20-40 meshes, and the mesh number of the water-soluble temporary plugging particles is 20-30 meshes;
detecting degradation amounts of various temporary plugging agents, wherein the degradation amounts are weight reduction values of the temporary plugging agents in construction time, and the construction time is time required by temporary plugging acid pressure construction;
screening the temporary plugging agent based on the degradation amount, so that the degradation amount of the screened temporary plugging agent is not more than 20% of the self weight;
providing a plurality of steel plates, and splicing the plurality of steel plates together in pairs, so that gaps with different widths are respectively formed between two adjacent steel plates, wherein the width of each gap is not more than the width range of each gap, the width of each gap comprises an average value of-1/4, an average value and an average value of +1/4, and the average value is the average width of the plurality of gaps;
injecting the screened temporary plugging agents into the gaps with different widths one by one respectively to determine the actual temporary plugging pressure of the different temporary plugging agents;
calculating the target temporary plugging pressure of the joint according to logging data, wherein the target temporary plugging pressure refers to a pressure value required to be born in temporary plugging acid pressure construction after the joint is plugged by the temporary plugging agent;
and carrying out secondary screening on the temporary plugging agent based on the actual temporary plugging pressure of the temporary plugging agent and the target temporary plugging pressure of the seam, so that the temporary plugging agent after the secondary screening meets the temporary plugging acid pressure construction.
2. The test method according to claim 1, wherein the detecting degradation amounts of the respective temporary plugging agents comprises:
determining construction time;
determining a reservoir temperature corresponding to the seam;
placing the temporary plugging agent in clear water, and recording the degradation amount of the temporary plugging agent in the clear water within the construction time, wherein the temperature of the clear water is the reservoir temperature;
and placing the temporary plugging agent in acid liquor with the reservoir temperature, and recording the degradation amount of the temporary plugging agent in the acid liquor within the construction time, wherein the temperature of the acid liquor is the reservoir temperature.
3. The test method according to claim 1, wherein the step of injecting the screened temporary plugging agents into the gaps of different widths one by one to determine actual temporary plugging pressures of the different temporary plugging agents comprises:
sequentially injecting different temporary plugging agents into the gaps with the same width, and plugging and pressure testing the gaps;
and sequentially injecting the same temporary plugging agent into the gaps with different widths, and plugging and pressure testing the gaps.
4. The method of claim 1, wherein calculating the target temporary plugging pressure for the joint based on the well log data comprises:
according to the logging data, calculating to obtain the primary fracture stress of the reservoir when the fracture is formed for the first time in the deep well to be acid-pressed and the secondary fracture stress of the reservoir when the fracture is formed again, wherein the primary fracture stress refers to the reservoir fracture stress corresponding to the first time when the temporary plugging acid is pressed, and the secondary fracture stress refers to the stratum fracture stress corresponding to the subsequent fracture is formed when the temporary plugging acid is pressed;
and calculating the target temporary plugging pressure of the seam based on the primary fracture stress and the secondary fracture stress.
5. The method of claim 4, wherein calculating a target temporary plugging pressure for the seam based on the primary cracking stress and the secondary cracking stress comprises:
and taking the difference value of the secondary fracture stress and the primary fracture stress as the target temporary plugging pressure of the seam.
6. The test method of claim 1, wherein performing a secondary screening of the temporary plugging agent based on an actual temporary plugging pressure of the temporary plugging agent and a target temporary plugging pressure of the seam comprises:
the actual temporary plugging pressure of the temporary plugging agent after the secondary screening is not smaller than the target temporary plugging pressure of the seam.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041289A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged |
| CN106150429A (en) * | 2016-08-24 | 2016-11-23 | 江汉油田科瑞德石油工程技术（武汉）有限公司 | Shale gas is multistage splits pressure diverting agent, without bridging plug fracturing process and device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6719053B2 (en) * | 2001-04-30 | 2004-04-13 | Bj Services Company | Ester/monoester copolymer compositions and methods of preparing and using same |
| US8835364B2 (en) * | 2010-04-12 | 2014-09-16 | Clearwater International, Llc | Compositions and method for breaking hydraulic fracturing fluids |
| CN104879113A (en) * | 2015-06-12 | 2015-09-02 | 中国石油化工股份有限公司 | Compound acid fracturing method for carbonate reservoir |
| CN104963673B (en) * | 2015-07-13 | 2017-12-26 | 中国石油大学(北京) | Simulate the visual experimental apparatus that fiber diversion agent temporarily blocks up hydraulic fracture |
| CN105602543B (en) * | 2015-10-22 | 2020-11-06 | 中国石油化工股份有限公司 | Acid fracturing temporary plugging agent and preparation method thereof |
| CN106194145B (en) * | 2016-09-27 | 2020-02-07 | 西南石油大学 | Multistage temporary plugging deep network acid fracturing method |
| CN108104789B (en) * | 2018-01-31 | 2020-08-04 | 西南石油大学 | Crack-adjustable temporary plugging acid fracturing steering performance testing device and evaluation method |
| CN108505967A (en) * | 2018-04-08 | 2018-09-07 | 西南石油大学 | Experimental provision is temporarily blocked up in a kind of oil/gas well eyelet and crack |
| CN110500076A (en) * | 2019-07-16 | 2019-11-26 | 李新勇 | It is a kind of for temporarily blocking up the Complex Temporary Blocking method of turnaround fracture |
| CN111561305A (en) * | 2020-05-09 | 2020-08-21 | 中国石油天然气集团有限公司 | Pre-prepared temporary plugging steering fracturing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041289A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged |
| CN106150429A (en) * | 2016-08-24 | 2016-11-23 | 江汉油田科瑞德石油工程技术（武汉）有限公司 | Shale gas is multistage splits pressure diverting agent, without bridging plug fracturing process and device |
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