CN115895614A - Leakage blocking slurry and preparation method thereof - Google Patents
Leakage blocking slurry and preparation method thereof Download PDFInfo
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- CN115895614A CN115895614A CN202110990101.8A CN202110990101A CN115895614A CN 115895614 A CN115895614 A CN 115895614A CN 202110990101 A CN202110990101 A CN 202110990101A CN 115895614 A CN115895614 A CN 115895614A
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Abstract
The invention provides a plugging slurry and a preparation method thereof. The leakage stopping slurry comprises water, first bentonite and a leakage stopping ball formed by sintering; wherein the leaking stoppage ball comprises a core material and a shell material; the core material comprises nut shells, inorganic particles, paraffin and polypropylene fibers; the shell material comprises second bentonite; wherein the inorganic particles are calcium carbonate and/or silica.
Description
Technical Field
The invention provides a high-temperature resistant plugging slurry with strong bearing capacity used in drilling engineering.
Background
Aiming at the problem of coexistence of salt paste layer overflow and leakage, a high-water-loss, hardenable and plugging leakage-stopping agent, a compound leakage-stopping agent with a shell as a main component, or a plurality of fiber, film-coated water-absorbent resin and other leakage-stopping materials are often adopted. Among the plugging materials, the cement plugging construction cost is higher, the construction time is long, and the plugging materials are often used as standby measures under the condition of unsatisfactory bridging plugging construction effect; the fiber material mainly plays a role in connecting the tie bars in series, mainly comprises paper scrap fiber or asbestos fiber, polypropylene fiber and the like, and the bridging material which is the most critical in plugging mainly adopts materials such as shells, rubber and the like, but the bridging material has low pressure bearing capacity and insufficient temperature resistance, is not easy to form a compact body for preventing leakage, is easy to deform and damage, and thus causes the phenomena of unsatisfactory plugging effect and low pressure bearing capacity.
Disclosure of Invention
The invention provides leakage-stopping slurry, which comprises water, first bentonite and sintered leakage-stopping balls; wherein the leaking stoppage ball comprises a core material and a shell material; the core material comprises nut shells, inorganic particles, paraffin and polypropylene fibers; the shell material comprises a second bentonite clay; wherein the inorganic particles are calcium carbonate and/or silica.
In a specific embodiment, the first bentonite is a sodium bentonite; the amount of the first bentonite is 3-5 parts by mass and the amount of the leakage blocking ball is 29-31 parts by mass based on 100 parts by mass of water.
In a specific embodiment, the nutshell is walnut shell.
In one embodiment, the median particle size of the nut shells is from 4 to 5 microns; the inorganic particles have a median particle size of 0.2 to 0.3 microns; the polypropylene fibers have a median length of from 1 to 3 microns and a median width of from 0.2 to 0.4 microns.
In a specific embodiment, the second bentonite is a calcium bentonite; the second bentonite is 100 parts by mass, the nut shell is 1-2 parts by mass, the inorganic particles are 5-7 parts by mass, the paraffin is 0.25-0.3 part by mass, and the polypropylene fiber is 0.75-1.7 parts by mass.
In one embodiment, the particle size of the leakage blocking ball is less than 3 cm and more than 1 cm.
The second invention provides a preparation method of the leakage-stopping slurry, which comprises the following steps:
1) Uniformly mixing the nut shells, the inorganic particles, the paraffin and the polypropylene fibers, and heating to melt the paraffin to obtain mixed powder;
2) Mixing the second bentonite with water to obtain a paste;
3) Preparing the mixed powder into a ball core with the size of 1-2 cm;
4) Coating the paste on the surface of the ball core to be twisted into a ball, and then sintering the ball at 70-80 ℃ for 10-20 minutes to obtain the leakage blocking ball;
5) And uniformly mixing water, the first bentonite and the plugging ball to prepare the plugging slurry.
In one embodiment, in step 2), the amount of water mixed therewith is 20 to 24 parts by mass based on 100 parts by mass of the second bentonite.
In one embodiment, the plugging slurry is prepared by stirring at a rate of 500 to 1500 rpm for 15 to 60 minutes in step 5).
In a specific embodiment, in step 4), the plugging balls pass through a3 cm screen to remove plugging balls with a pore size larger than 3 cm, and then pass through a1 cm screen to remove plugging balls with a pore size smaller than 1 cm, so as to obtain the plugging balls with a proper size.
The invention has the beneficial effects that:
the leakage-stopping slurry suitable for salt-gypsum layer drilling provided by the technical scheme has the pressure-bearing capacity of more than 5MPa, the temperature resistance of 180 ℃, the leakage-stopping of the layer position where leakage occurs can be quickly and accurately stopped on the premise that the rheological property of the leakage-stopping slurry is not influenced, the field practicability is strong, and the leakage-stopping balls are easy to recover.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not to be construed as limiting the invention in any way.
Example 1
S1, preparing a plugging ball
S11, uniformly mixing 1.5 parts by mass of walnut shells with the median particle size of 5 micrometers, 6 parts by mass of calcium carbonate with the median particle size of 0.3 micrometers, 0.3 part by mass of paraffin and 1.2 parts by mass of polypropylene fibers with the median length of 2 micrometers and the median width of 0.3 micrometers on a tray, and then feeding the mixture into a heating box to heat the mixture for 10 minutes at the temperature of 60 ℃ to obtain mixed powder;
s12, adding 100 parts by mass of calcium bentonite into 22 parts by mass of water, and stirring and mixing to obtain a paste;
s13, firstly, preliminarily rubbing the mixed powder obtained in the step S11 into a ball core with the diameter of 1-2 cm by using a rotary screen, and then coating the paste obtained in the step S12 on the outer part of the ball core by using the rotary screen to rub the paste into balls;
and S14, sintering the ball-shaped object obtained in the step S13 in a calcining furnace at the temperature of 75 ℃ for 15 minutes, taking out the sintered ball-shaped object for natural cooling, then passing through a sieve with the aperture of 3 cm to remove balls larger than 3 cm, and then passing through a sieve with the aperture of 1 cm to remove balls smaller than 1 cm, thus obtaining the leakage-stopping ball.
S2, adding 100 parts by mass of water, 4 parts by mass of nano bentonite and 30 parts by mass of the plugging ball prepared in the step S1 into an enamel measuring cup, stirring and mixing, wherein the stirring speed is 1000 revolutions per minute, the ambient temperature during stirring is room temperature, and the stirring time is 35 minutes, so that the plugging slurry A1 suitable for salt-gypsum layer drilling is prepared.
Example 2
S1, preparing a plugging ball
S11, uniformly mixing 1 part by mass of walnut shells with the median particle size of 4 micrometers, 5 parts by mass of calcium carbonate with the median particle size of 0.2 micrometer, 0.25 part by mass of paraffin and 0.75 part by mass of polypropylene fibers with the median length of 1 micrometer and the median width of 0.2 micrometer on a tray, and then feeding the mixture into a heating box to heat the mixture for 10 minutes at the temperature of 60 ℃ to obtain mixed powder;
s12, adding 20 parts by weight of water into 100 parts by weight of calcium bentonite, and stirring and mixing to obtain a paste;
s13, firstly, preliminarily rubbing the mixed powder obtained in the step S11 into a ball core with the size of 1-2 cm by using a rotary screen, and then coating the paste obtained in the step S12 on the outer part of the ball core by using the rotary screen to rub the paste into a ball;
s14, putting the ball-shaped object obtained in the step S13 into a calcining furnace, sintering for 10 minutes at 70 ℃, taking out, naturally cooling, passing through a screen with the aperture of 3 cm to remove balls larger than 3 cm, and passing through a screen with the aperture of 1 cm to remove balls smaller than 1 cm, thus obtaining the leakage blocking ball.
And S2, adding 100 parts by mass of water, 3 parts by mass of nano bentonite and 29 parts by mass of the plugging ball prepared in the step S1 into an enamel measuring cup, stirring and mixing, wherein the stirring speed is 1000 revolutions per minute, the ambient temperature during stirring is room temperature, and the stirring time is 30 minutes, so that the plugging slurry A2 suitable for salt-gypsum layer drilling is prepared.
Example 3
S1, preparing a plugging ball
S11, uniformly mixing 2 parts by mass of walnut shells with the median particle size of 4 micrometers, 7 parts by mass of calcium carbonate with the median particle size of 0.2 micrometers, 0.3 part by mass of paraffin and 1.7 parts by mass of polypropylene fibers with the median length of 3 micrometers and the median width of 0.4 micrometer on a tray, and then feeding the mixture into a heating box to heat the mixture for 10 minutes at the temperature of 60 ℃ to obtain mixed powder;
s12, adding 24 parts by mass of water into 100 parts by mass of calcium bentonite, and stirring and mixing to obtain a paste;
s13, firstly, preliminarily rubbing the mixed powder obtained in the step S11 into a ball core with the diameter of 1-2 cm by using a rotary screen, and then coating the paste obtained in the step S12 on the outer part of the ball core by using the rotary screen to rub the paste into balls;
and S14, sintering the spherical object obtained in the step S13 in a calcining furnace at the temperature of 80 ℃ for 20 minutes, taking out the spherical object for natural cooling, then passing through a screen with the aperture of 3 cm to remove the balls larger than 3 cm, and then passing through a screen with the aperture of 1 cm to remove the balls smaller than 1 cm, thus obtaining the leakage blocking balls.
And S2, adding 100 parts by mass of water, 5 parts by mass of nano bentonite and 31 parts by mass of the plugging ball prepared in the step S1 into an enamel measuring cup, stirring and mixing, wherein the stirring speed is 1200 revolutions per minute, the ambient temperature during stirring is room temperature, and the stirring time is 40 minutes, so that the plugging slurry A3 suitable for salt-gypsum layer drilling is prepared.
Comparative example 1
The remaining characteristics are the same as in example 1, except that the operation of preparing the leak-stopping ball in step S1 is not performed, i.e., 1.5 parts by mass of walnut shells having a median particle diameter of 5 micrometers, 6 parts by mass of calcium carbonate having a median particle diameter of 0.3 micrometers, 0.3 part by mass of paraffin wax, and 1.2 parts by mass of polypropylene fibers having a median length of 2 micrometers and a median width of 0.3 micrometers are directly mixed with 100 parts by mass of water and 4 parts by mass of nano-bentonite to prepare leak-stopping pulp D1.
Comparative example 2
The other characteristics were the same as in example 1, except that the particle size of the plugging ball was 0.1 cm, to prepare a plugging slurry D2.
Comparative example 3
The other characteristics are the same as those of the example 1, except that the particle size of the plugging ball is 7 cm, and the plugging slurry D3 is prepared.
Comparative example 4
The remaining characteristics were the same as in example 1, except that in step S14, the sintering temperature of the calciner was 40 ℃ to obtain a plugging slurry D4.
Comparative example 5
The remaining characteristics were the same as in example 1, except that in step S14, the sintering temperature of the calciner was 100 ℃ to obtain a plugging slurry D5.
Comparative example 6
The comparative example is a blank control group, and is a case without adding a leakage blocking ball, specifically, 100 parts by mass of water and 4 parts by mass of nano bentonite are added into an enamel measuring cup to be stirred and mixed, the stirring speed is 1000 revolutions per minute, the ambient temperature during stirring is room temperature, and the stirring time is 30 minutes, so that the leakage blocking paste D6 is prepared.
Measurement of Performance
The plugging slurry prepared in examples 1 to 3 and comparative examples 1 to 6 were subjected to rheological property test and plugging property test, specifically referring to standard "petroleum and natural gas industry drilling fluid laboratory test" (GB/T29170 2012), wherein the rheological property refers to the 6.4 th "rheological property test" of the standard, and the plugging property refers to the 11.4 th "static slit test procedure" of the standard, and the related data are shown in table 1.
TABLE 1
| Serial number | Plastic viscosity/mPa.s | Breakdown pressure/MPa |
| A1 | 8 | - |
| A2 | 9 | - |
| A3 | 8 | - |
| D1 | 25 | - |
| D2 | 18 | 2 |
| D3 | 9 | 1 |
| D4 | 15 | 4 |
| D5 | 21 | 1 |
| D6 | 8 | 0 |
Note: "-" indicates that breakdown did not occur under a pressure of 5 MPa.
And (3) data analysis: the plastic viscosity of A1 to A3 is almost unchanged compared with that of D6, which shows that the composite material has good rheological property; when the leakage stoppage performance is evaluated, the A1 to A3 are not punctured, which shows that the formed leakage stoppage layer has good strength. When the plugging performance is evaluated, the A1 to A3 are not punctured, and compared with a comparative example, the bearing capacity is obviously improved, which shows that the formed plugging layer has good strength.
While the invention has been described with reference to specific embodiments, those skilled in the art will appreciate that various changes can be made without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, and method to the essential scope and spirit of the present invention. All such modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (9)
1. A leakage stoppage slurry comprises water, first bentonite and a leakage stoppage ball formed by sintering; wherein the leaking stoppage ball comprises a core material and a shell material; the core material comprises nut shells, inorganic particles, paraffin and polypropylene fibers; the shell material comprises second bentonite; wherein the inorganic particles are calcium carbonate and/or silica.
2. The leakage blocking paste as claimed in claim 1, wherein the first bentonite is sodium bentonite; the amount of the first bentonite is 3-5 parts by mass and the amount of the leakage blocking ball is 29-31 parts by mass based on 100 parts by mass of water.
3. The leak stopping slurry as claimed in claim 1, wherein the nut shell is walnut shell; and/or
The median particle size of the nutshells is from 4 to 5 microns; the inorganic particles have a median particle size of 0.2 to 0.3 microns; the polypropylene fibers have a median length of from 1 to 3 microns and a median width of from 0.2 to 0.4 microns.
4. The leakage blocking paste as claimed in claim 1, wherein the second bentonite is calcium bentonite; the second bentonite is 100 parts by mass, the nut shell is 1-2 parts by mass, the inorganic particles are 5-7 parts by mass, the paraffin is 0.25-0.3 part by mass, and the polypropylene fiber is 0.75-1.7 parts by mass.
5. Leakage plugging slurry according to claims 1 to 4, wherein the particle size of the leakage plugging balls is below 3 cm and above 1 cm.
6. A method for producing a plugging slurry according to any one of claims 1 to 5, comprising the steps of:
1) Uniformly mixing the nut shells, the inorganic particles, the paraffin and the polypropylene fibers, and heating to melt the paraffin to obtain mixed powder;
2) Mixing the second bentonite with water to obtain a paste;
3) Preparing the mixed powder into a ball core with the size of 1-2 cm;
4) Coating the paste on the surface of the ball core to be twisted into a ball, and then sintering the ball at 70-80 ℃ for 10-20 minutes to obtain the leakage blocking ball;
5) And uniformly mixing water, the first bentonite and the plugging ball to prepare the plugging slurry.
7. The production method according to claim 6, wherein in step 2), the amount of water mixed therewith is 20 to 24 parts by mass based on 100 parts by mass of the second bentonite.
8. The method according to claim 6 or 7, wherein the slurry is prepared by stirring at a rate of 500 to 1500 rpm for 15 to 60 minutes in step 5).
9. The preparation method according to claim 6 or 7, wherein in the step 4), the plugging balls pass through a screen with an aperture of 3 cm to remove the plugging balls with an aperture of more than 3 cm, and then pass through a screen with an aperture of 1 cm to remove the plugging balls with an aperture of less than 1 cm, so that the plugging balls with a proper size are obtained.
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| CN202110990101.8A CN115895614A (en) | 2021-08-26 | 2021-08-26 | Leakage blocking slurry and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628077A (en) * | 2018-12-28 | 2019-04-16 | 西南石油大学 | A kind of strong structure sealing agent and preparation method thereof |
| CN110551491A (en) * | 2018-05-31 | 2019-12-10 | 中国石油化工股份有限公司 | Coating plugging agent, preparation method thereof and plugging slurry |
| CN112239661A (en) * | 2019-07-18 | 2021-01-19 | 中石化石油工程技术服务有限公司 | Plugging agent and plugging slurry for reservoir leakage |
| CN112980406A (en) * | 2021-02-22 | 2021-06-18 | 西南石油大学 | Pressure-bearing leakage stoppage composition, pressure-bearing leakage stoppage slurry and preparation method and application thereof |
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- 2021-08-26 CN CN202110990101.8A patent/CN115895614A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551491A (en) * | 2018-05-31 | 2019-12-10 | 中国石油化工股份有限公司 | Coating plugging agent, preparation method thereof and plugging slurry |
| CN109628077A (en) * | 2018-12-28 | 2019-04-16 | 西南石油大学 | A kind of strong structure sealing agent and preparation method thereof |
| CN112239661A (en) * | 2019-07-18 | 2021-01-19 | 中石化石油工程技术服务有限公司 | Plugging agent and plugging slurry for reservoir leakage |
| CN112980406A (en) * | 2021-02-22 | 2021-06-18 | 西南石油大学 | Pressure-bearing leakage stoppage composition, pressure-bearing leakage stoppage slurry and preparation method and application thereof |
Non-Patent Citations (1)
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| 乌效明等: "《钻井液与岩土工程浆液实验原理与方法》", 中国地质大学出版社, pages: 167 - 168 * |
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