CN112480884B - Shell membrane structure plugging material, preparation method and use method - Google Patents
Shell membrane structure plugging material, preparation method and use method Download PDFInfo
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- CN112480884B CN112480884B CN202011440703.8A CN202011440703A CN112480884B CN 112480884 B CN112480884 B CN 112480884B CN 202011440703 A CN202011440703 A CN 202011440703A CN 112480884 B CN112480884 B CN 112480884B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
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Abstract
The present invention belongs toIn the technical field of oil and gas drilling engineering, in particular to a shell membrane structure plugging material, a preparation method and a use method. The invention comprises aluminum film and Fe3O4And gelatin, Fe3O4Wrapping with gelatin, and wrapping with gelatin-coated Fe3O4An aluminum film is wrapped outside, and a layer of gelatin is wrapped outside the aluminum film. The invention utilizes the action of the earth magnetic field to inject magnetic media Fe with different shapes, different proportions and different grain gradations into the cracks3O4The rapid magnetization can quickly form a relatively stable net-shaped three-dimensional leaking stoppage framework with certain bearing capacity, the framework is filled with cracks, and the rapid leaking stoppage can be realized by matching with a liquid-phase leaking stoppage agent, so that the time for leaking stoppage is saved, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling engineering, and particularly relates to a shell membrane structure plugging material, a preparation method and a use method.
Background
The lost circulation is one of the most common technical problems in oil and gas drilling engineering, not only can increase drilling time, lose drilling fluid and interfere geological logging work, but also can cause a series of underground complex events such as blockage, drilling sticking, well collapse and the like, and can seriously cause underground accidents such as blowout, well hole abandonment and the like, thereby causing great economic loss and influencing the exploration and development process, and the loss caused by the lost circulation is more than hundreds of millions of dollars every year globally. According to statistics, the loss of the plugging material is nearly 5000 ten thousand yuan per year and the average loss time of plugging of a single well is nearly 200 hours in a plurality of large-scale leaking layers of a certain oil and gas field, so that the drilling cost is seriously increased.
Disclosure of Invention
The invention provides a shell-and-membrane structure plugging material, a preparation method and a use method, and aims to provide a plugging material which can quickly magnetize paramagnetic substances, diamagnetic substances and ferromagnetic substances with different shapes, different proportions and different grain grading in cracks, quickly form a relatively stable net-shaped three-dimensional plugging framework with certain bearing capacity, fill the cracks and realize quick plugging by matching with a liquid-phase plugging agent.
In order to achieve the purpose, the invention adopts the technical scheme that:
a shell-film structure leakage-stopping material comprises aluminum film and Fe3O4And gelatin; said Fe3O4Wrapping a layer of gelatin to form a capsule with gelatin as a shell and an inner cavity; gelatin coated Fe3O4An aluminum film is wrapped outside, and a layer of gelatin is wrapped outside the aluminum film.
Said Fe3O4Is made of Fe with the shape of ring, triangle, square, isosceles trapezoid, cylinder or prism3O4Mixing the components.
The Fe coated with gelatin3O4Is a sphere with a diameter of 2-20mm and a density of 0.92-2.1g/cm3。
The Fe coated with gelatin3O4The sphere is filled with nitrogen.
The gelatin is industrial gelatin.
The thickness of the gelatin coating is 0.5-1.5 mm.
The thickness of the aluminum film is 0.2-0.5 mm.
A preparation method of a shell membrane structure plugging material comprises the following steps:
the first step is as follows: mixing Fe with gelatin at 68-72 deg.C3O4Performing hot melting and plastic coating, and injecting preset nitrogen into the inner cavity of the gelatin;
the second step is that: plating an aluminum film on the material prepared in the step one;
the third step: and (3) carrying out hot melting and plastic coating on the outer wall of the material subjected to the second aluminum film coating under the temperature of 58-62 ℃, and making the material into a round shape.
A method for using the plugging material of shell membrane structure includes such steps as mixing the plugging material of shell membrane structure with drilling mud (10-15: 85-90) by weight ratio, directly adding it to well, and pumping it to bottom of well.
The pH value of the drilling mud is between 8 and 10.
Has the advantages that:
(1) the invention utilizes the principle of earth magnetic field, and the interaction of the earth magnetic field and the magnetic medium can quickly magnetize the magnetic medium with different shapes, different proportions and different grain compositions injected into the crack, quickly form a relatively stable net-shaped three-dimensional leaking stoppage framework with certain bearing capacity, fill the crack, and realize quick leaking stoppage by matching with the liquid-phase leaking stoppage agent, thereby saving the time for leaking stoppage and saving the cost.
(2) The invention is prepared by wrapping Fe3O4The amount of nitrogen injected into the inner cavity of the gelatin realizes the adjustment of the density of the material.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a more clear understanding of the technical features of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a shell-film structure leakage-stopping material comprises aluminum film and Fe3O4And gelatin; said Fe3O4Coating with gelatin to obtain gelatin-coated productA shell, a capsule having an inner cavity; fe coated gelatin3O4An aluminum film is wrapped outside, and a layer of gelatin is wrapped outside the aluminum film.
The magnitude and direction of the magnetic field at the bottom of the well are basically stable, and the direction is basically north-south. After a magnetic field passes through the medium, the strength and the direction of the magnetic field can be changed. When a plurality of magnetic media Fe are put into the bottom hole crack3O4Rear, magnetic medium Fe3O4Under the action of different forces in different sizes and directions at the bottom of the well, fixed structures with different shapes are formed in the crack.
The aluminum film has the following action mechanism:
the aluminum film mainly plays a role in coating and shielding magnetic medium Fe3O4So that the magnetic medium can be smoothly put into the bottom of the well, and then the dissolution reaction can make the metal shielding effect lose efficacy, so that the magnetic medium Fe can be used3O4And (4) playing a role.
The metallic aluminum is easy to dissolve and react with water in the solution and releases heat to form a stable product Al (OH) at low temperature3AlO (OH) as a medium-temperature stable product and Al as a high-temperature stable product2O3And H2。
2Al+6H2O＝2Al(OH)3+3H2↑
2Al+4H2O＝2AlO(OH)+3H2↑
2Al+3H2O＝2Al2O3+3H2↑
The gelatin in this example functions as: the outer gelatin layer realizes the isolation of the drilling fluid from the aluminum film; the inner gelatin layer realizes aluminum and magnetic medium Fe3O4Isolation of (2).
The invention makes full use of the interaction of the geomagnetic field and the magnetic medium, quickly magnetizes the magnetic medium with different shapes, different proportions and different grain compositions injected into the cracks, quickly forms a relatively stable net-shaped three-dimensional leaking stoppage framework with certain bearing capacity, fills the cracks, and realizes quick leaking stoppage by matching with the liquid-phase leaking stoppage agent.
Example two:
a shell membrane structure plugging material is based on the first embodiment:said Fe3O4Is made of Fe with the shape of ring, triangle, square, isosceles trapezoid, cylinder or prism3O4Mixing the components.
In actual use, Fe of various shapes is adopted3O4So that Fe3O4The structure is more stable after entering the crack, and can be better fixed.
Example three:
a shell membrane structure plugging material is based on the first embodiment: the Fe coated with gelatin3O4Is a sphere with a diameter of 2-20mm and a density of 0.92-2.1g/cm3。
Further, the gelatin-coated Fe3O4The round sphere of (2) is filled with nitrogen.
In practical use, the adoption of the industrial latex is beneficial to the adhesion of each framework and the plugging material of the crack, and the improvement of the plugging speed and the pressure-bearing capacity of the crack. Gelatin coated Fe3O4The technical scheme of the spherical body with the diameter of 2-20mm is adopted, the manufacturing cost is relatively low, the density is stable after the spherical body is mixed with the drilling fluid, and the spherical body can be organically matched with the drilling fluid to better realize leaking stoppage.
Fe coated gelatin3O4The nitrogen is injected into the round ball, the density of the material is changed by the amount of the injected nitrogen, and the adjustment of the density of the material is conveniently realized.
Example four:
a shell membrane structure plugging material is based on the first embodiment: the gelatin is industrial gelatin.
Furthermore, the thickness of the gelatin coating is 0.5-1.5 mm.
Furthermore, the thickness of the aluminum film is 0.2-0.5 mm.
In practical use, the gelatin is industrial gelatin which is used as an isolation medium, can delay reaction, has the advantages of density adjustment and reaction delay, is nontoxic and harmless after being dissolved, does not influence performance parameters of the leaking stoppage liquid, and is low in price, reliable in performance and sufficient in goods source.
The hollow fiber is used as a common plugging material in the field, is easy to prepare, has low price and reliable performance.
The gelatin package adopts the technical scheme that the thickness is 0.5-1.5mm, so that the delay time and the reasonable density of the material are ensured, the price is low, the material is convenient, the performance is reliable, and the performance parameters of the leaking stoppage liquid are not influenced after the gelatin package is dissolved.
The aluminum film shields ferroferric oxide, and prevents the ferroferric oxide from being magnetized with the sleeve to generate attraction. The film thickness adopts the technical scheme that the thickness is 0.2-0.5mm, so that the requirement of site construction time is met, and the performance parameters of the plugging liquid are not influenced after reaction.
Example five:
a preparation method of a shell-and-membrane structure plugging material comprises the following steps:
the first step is as follows: mixing Fe with gelatin at 68-72 deg.C3O4Performing hot melting and plastic coating, and injecting preset nitrogen into the inner cavity of the gelatin;
the second step is that: plating an aluminum film on the material prepared in the step one;
the third step: and (3) carrying out hot melting and plastic coating on the outer wall of the material subjected to the second aluminum film coating under the temperature of 58-62 ℃, and making the material into a round shape.
The plugging material prepared by the technical scheme of the invention can fully utilize the interaction of the geomagnetic field and the magnetic medium, so that the magnetic media with different shapes, different proportions and different grain compositions injected into the cracks are quickly magnetized, a relatively stable net-shaped three-dimensional plugging framework with certain bearing capacity is quickly formed, the cracks are filled, the rapid plugging is realized by matching with the liquid-phase plugging agent, the time for plugging is saved, and the cost is saved.
Example six:
a method for using the plugging material of shell membrane structure includes such steps as mixing the plugging material of shell membrane structure with drilling mud (10-15: 85-90) by weight ratio, directly adding it to well, and pumping it to bottom of well.
Further, the pH value of the drilling mud is between 8 and 10.
In practical use, the plugging base slurry generally has a pH value of 8-10, and the shielding conductor Al also undergoes chemical reaction. The melting speed of the gelatin capsule determines the reaction delay time, and ensures that the magnetic substance Fe3O4After reaching the bottom hole crack, the magnetization reaction occurs.
According to the technical scheme, the interaction of the geomagnetic field and the magnetic medium is fully utilized, the magnetic media with different shapes, different proportions and different particle size distributions, which are injected into the cracks, are quickly magnetized, the relatively stable net-shaped three-dimensional leaking stoppage framework with certain pressure bearing capacity is quickly formed, the cracks are filled, and the quick leaking stoppage is realized by matching with the liquid-phase leaking stoppage agent, so that the time for leaking stoppage is saved, and the cost is saved.
Example seven:
the relationship between the thickness of the industrial gelatin film and the initial reaction time of the aluminum film is tested, and the test results are recorded as shown in the following table 1:
TABLE 1
| Serial number | Film thickness | Initial reaction time of aluminum | Results |
| 1 | 0.2mm | 15min | The reaction is too fast |
| 2 | 0.5mm | 30min | Meet the requirements of the field |
| 3 | 1mm | 45min | Meet the requirements of the field |
| 4 | 1.5mm | 73min | Meet the requirements of the field |
| 5 | 2mm | 96min | The reaction is too slow |
The test result shows that: the thickness of the outer industrial gelatin film is between 0.5mm and 1.5mm, which can meet the requirement of leaking stoppage in a drilling site.
Example eight:
thickness of aluminum film and Fe3O4The magnetization time relationship test, the test results are recorded as shown in the following table 2:
TABLE 2
| Serial number | Thickness of aluminum film | Fe3O4Time of magnetization | As a result, the |
| 1 | 0.1 | 0.5min | Satisfactory in-situ but complex process |
| 2 | 0.2 | 1.5min | The site is satisfied, the process is simple |
| 3 | 0.3 | 2.3min | The site is satisfied, the process is simple |
| 4 | 0.5 | 6min | The method meets the requirements of site and has simple process |
| 5 | 1 | 13min | The reaction is too slow |
The test result shows that: the thickness of the aluminum plating film is 0.5-1.5mm, which can meet the requirement of leak stoppage in a drilling site.
Example nine:
the addition amount and the effect evaluation test of the plugging material are carried out, and the test records are shown in the following table 3:
TABLE 3
| Serial number | Plugging material | Base pulp | Results |
| 1 | 2.5 | 97.5 | The leaking stoppage effect is not obvious |
| 2 | 5 | 95 | The leaking stoppage effect is obviously improved |
| 3 | 7.5 | 92.5 | The leaking stoppage effect is obviously improved |
| 4 | 10 | 90 | The leaking stoppage effect is obviously improved |
| 5 | 15 | 85 | The leakage stoppage effect is reduced |
| 6 | 20 | 80 | The leakage stoppage effect is reduced |
The test result shows that: the plugging material with the mass ratio of 5-10% is added, so that the requirement of plugging on a drilling site can be met, and the plugging effect is optimal.
Example ten:
the results of the comparative test of the present invention with conventional lost circulation materials are shown in table 4 below.
TABLE 4
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The shell-and-film structure plugging material is characterized in that: comprises aluminum film and Fe3O4And gelatin; said Fe3O4Wrapping a layer of gelatin to form a capsule with gelatin as a shell and an inner cavity; fe coated gelatin3O4An aluminum film is wrapped outside the filmWrapping a layer of gelatin;
the thickness of the gelatin coating is 0.5-1.5 mm;
the thickness of the aluminum film is 0.2-0.5 mm;
the preparation method of the shell-membrane structure plugging material comprises the following steps:
the first step is as follows: mixing Fe with gelatin at 68-72 deg.C3O4Performing hot melting and plastic coating, and injecting preset nitrogen into the inner cavity of the gelatin;
the second step is that: coating an aluminum film on the material prepared in the first step;
the third step: and (3) performing hot melting and plastic coating on the outer wall of the material subjected to the second aluminum film coating at the temperature of 58-62 ℃, and making the outer wall into a round shape.
2. A shell-and-film structure lost circulation material as defined in claim 1, wherein: said Fe3O4Is made of Fe with the shape of ring, triangle, square, isosceles trapezoid, cylinder or prism3O4Mixing the components.
3. A shell-and-film structured lost circulation material as claimed in claim 1, wherein: the Fe coated with gelatin3O4Is a sphere with a diameter of 2-20mm and a density of 0.92-2.1g/cm3。
4. A shell-and-film structure lost circulation material as defined in claim 3, wherein: the Fe coated with gelatin3O4The sphere is filled with nitrogen.
5. A shell-and-film structured lost circulation material as claimed in claim 1, wherein: the gelatin is industrial gelatin.
6. The use method of the shell membrane structure plugging material as claimed in any one of claims 1 to 5, wherein: the plugging material with the shell membrane structure and the drilling mud are mixed according to the weight ratio of 10-15: 85-90, then are directly added into a well, and are carried into the bottom of the well by the circulating drilling mud.
7. The use method of the shell-and-film structure lost circulation material according to claim 6, wherein: the pH of the drilling mud is between 8 and 10.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007038802A2 (en) * | 2005-09-30 | 2007-04-05 | Ilypsa, Inc. | Methods for preparing core-shell composites having cross-linked shells and core-shell composites resulting therefrom |
| US20080274275A1 (en) * | 2004-11-29 | 2008-11-06 | Japan Science And Technology Agency | Method For Preparing Composite Fine Particles |
| CN111826141A (en) * | 2019-04-23 | 2020-10-27 | 中国石油化工股份有限公司 | Shell-and-film structure plugging material and preparation method thereof |
| CN111826142A (en) * | 2019-04-23 | 2020-10-27 | 中国石油化工股份有限公司 | Bridging leakage-stopping slurry based on polymer-coated shell particle material and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080274275A1 (en) * | 2004-11-29 | 2008-11-06 | Japan Science And Technology Agency | Method For Preparing Composite Fine Particles |
| WO2007038802A2 (en) * | 2005-09-30 | 2007-04-05 | Ilypsa, Inc. | Methods for preparing core-shell composites having cross-linked shells and core-shell composites resulting therefrom |
| CN111826141A (en) * | 2019-04-23 | 2020-10-27 | 中国石油化工股份有限公司 | Shell-and-film structure plugging material and preparation method thereof |
| CN111826142A (en) * | 2019-04-23 | 2020-10-27 | 中国石油化工股份有限公司 | Bridging leakage-stopping slurry based on polymer-coated shell particle material and preparation method thereof |
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