CN106830667B - Modification method of hollow glass beads and application thereof - Google Patents
Modification method of hollow glass beads and application thereof Download PDFInfo
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Abstract
The invention provides a modification method of hollow glass beads and application thereof, wherein the modification method comprises the following steps of: 1) putting the hollow glass beads into a cavity of a plasma treatment instrument, adjusting the pressure in the cavity of the plasma treatment instrument to be below 9Pa, and then introducing cleaning gas into the cavity of the plasma treatment instrument to clean the hollow glass beads; 2) introducing an activating gas into the cavity of the plasma treatment instrument to activate the hollow glass beads after the cleaning treatment; 3) and introducing grafting gas into the cavity of the plasma treatment instrument to graft the hollow glass beads subjected to the binding and activating treatment to generate modified hollow glass beads. The modification method provided by the invention is simple and easy to implement, strong in production controllability and good in product consistency, and effectively enhances the surface activity and hydrophilic property of the hollow glass microspheres, thereby improving the stability of cement paste and enhancing the compressive strength of the cement paste.
Description
Technical Field
The invention relates to a modification method of hollow glass beads and application thereof, belonging to the technical field of oil exploitation.
Background
The annular flow channeling problem after cementing of oil and gas wells troubles all large oil and gas fields in the world so far and is a huge challenge for maintaining the integrity of a shaft, and because the gas fields constructed in front of the top of a Tarim oil field, such as Yaha, Clara, Dina, Keshen and the like, face a more urgent and more complex annular flow channeling problem due to the geological characteristics of ultra-deep, high temperature and high pressure, large-temperature-difference low-density cement slurry with stable performance is urgently needed to be adopted as a main cementing raw material in the field of oil and gas exploitation.
The hollow glass beads serving as novel rigid particles developed in recent years have the advantages of light weight, good chemical stability and thermal stability, high sound insulation and electrical insulation and the like, and are applied to the field of materials, particularly used as a lightening admixture added into cement paste to reduce the density of the cement paste. However, the density of the hollow glass beads is greatly different from that of other admixtures such as cement, and the cement slurry is very easy to settle and stratify after the hollow glass beads are added, so that the hollow glass beads are unevenly distributed in the cement slurry, the performance of the cement slurry is unstable, the compressive strength is reduced, the complex conditions such as pump holding and the like are easily caused in the well cementation construction process, and the well cementation quality and the construction safety are seriously influenced.
Disclosure of Invention
The invention provides a modification method of hollow glass beads and application thereof, which are used for overcoming the defects of unstable cement paste performance and reduced compressive strength caused by uneven distribution of the hollow glass beads serving as a lightening agent in cement paste in the prior art.
The invention provides a modification method of hollow glass beads, which comprises the following steps in sequence:
1) putting hollow glass beads into a cavity of a plasma treatment instrument, adjusting the pressure in the cavity of the plasma treatment instrument to be below 9Pa, and then introducing cleaning gas into the cavity of the plasma treatment instrument to clean the hollow glass beads;
2) introducing an activating gas into the cavity of the plasma treatment instrument to activate the hollow glass beads after the cleaning treatment;
3) and introducing grafting gas into the cavity of the plasma treatment instrument to graft the hollow glass beads subjected to the binding and activating treatment to generate modified hollow glass beads.
Hollow coreThe glass beads have a particle size of 10-250 micrometers and a wall thickness of 1-2 micrometers, and are filled with CO2The gas closed micro sphere mainly comprises borosilicate and has oleophilic and hydrophobic properties. The invention modifies hollow glass microspheres by a plasma treatment method, wherein the plasma treatment method is used for treating substances by utilizing active components by applying enough energy to gas to ionize the gas into a plasma state. The method does not change the inherent performance of the hollow glass microspheres, and is environment-friendly, clean and pollution-free.
In the step 1), before modifying the hollow glass beads, firstly, cleaning the surfaces of the hollow glass beads by using a plasma method, and cleaning oily substances on the surfaces of the hollow glass beads to enhance the hydrophilicity of the hollow glass beads. Specifically, the hollow glass beads of 350 to 600 mesh can be preferably modified. After being laid on a glass utensil, the hollow glass beads are placed in a cavity of a plasma treatment instrument, a vacuum pump is started to adjust the pressure in the cavity to be below 9Pa, and then cleaning gas can be introduced into the cavity to clean the hollow glass beads.
And in the step 2), after the cleaning treatment is finished, stopping introducing the cleaning gas, similarly controlling the pressure of the cavity to be less than 9Pa, and introducing an activating gas into the cavity to activate the hollow glass beads. Specifically, the activation treatment comprises the step of carrying out activation etching on the hollow glass beads, so that the activity of the hollow glass beads can be effectively enhanced, the surface area of the hollow glass beads can be increased, the effective modification area is increased, and the modification efficiency is improved.
And 3) stopping introducing the activating gas after the activation treatment is finished, similarly controlling the pressure of the cavity to be less than 9Pa, and introducing the grafting gas into the cavity to graft the hollow glass beads. The surface of the hollow glass microsphere is combined with a proper branched chain or functional side group through a chemical bond, so that the performance of the hollow glass microsphere is improved, and finally the modified hollow glass microsphere is generated.
The method for modifying the hollow glass microspheres is simple, convenient and feasible, has strong production controllability and good product consistency, completes the modification of the hollow glass microspheres by cleaning, activating and grafting the hollow glass microspheres, and effectively enhances the surface activity and the hydrophilic performance of the hollow glass microspheres, thereby improving the stability of cement paste and enhancing the compressive strength of the cement paste.
Further, the cleaning gas is selected from one or two of air, nitrogen and oxygen; controlling the flow rate of the cleaning gas to be 0.2-1.0L/min. When the purge gas is a mixture of two gases, the present invention does not limit the ratio between the gases.
Further, when the cleaning treatment is carried out, the power of the plasma treatment instrument is 50-300W, and the cleaning treatment time is 50-200 s. Specifically, after the flow of the cleaning gas is stable, a high-frequency power supply of the plasma processor can be started to discharge, the power is controlled to be 50-300W, and the cleaning time is 50-200 s.
Further, the activating gas is selected from one or two of air, nitrogen and oxygen; controlling the flow rate of the activated gas to be 0.2-1.0L/min. When the activating gas is a mixture of two gases, the present invention does not limit the ratio between the gases. In the modification method of the present invention, the cleaning gas and the activating gas may be the same or different.
Further, during the activation treatment, the power of the plasma treatment instrument is 50-300W, and the duration of the activation treatment is 100-300 s. Specifically, after the flow of the activated gas is stable, a high-frequency power supply of the plasma processor can be started to discharge, the power is controlled to be 50-300W, and the cleaning time is 100-300 s.
Further, before the step 3), vaporizing an acrylic acid aqueous solution with the mass fraction of 5-95% to generate acrylic acid gas; gasifying an ethylene glycol aqueous solution with the mass fraction of 5-95% to generate ethylene glycol gas; the grafting gas is selected from one of the acrylic acid gas and the ethylene glycol gas; controlling the flow rate of the grafting gas to be 0.1-1.0L/min.
According to the invention, one of acrylic acid gas and ethylene glycol gas is selected to carry out grafting treatment on the hollow glass beads, and before the grafting treatment, 5-95% by mass of acrylic acid aqueous solution is heated to generate acrylic acid gas or 5-95% by mass of ethylene glycol aqueous solution is heated to generate ethylene glycol gas.
Further, when the grafting treatment is carried out, the power of the plasma treatment instrument is 100-300W, and the grafting treatment time is 300-1200 s. Specifically, under the vacuum condition, after the flow of the grafting gas is stable, a high-frequency power supply of the plasma treatment instrument grafting equipment can be started to discharge, the power is controlled to be 10-300W, and the cleaning time is 300-1200 s.
It is noted that, when the specific modification is carried out, the power and duration parameters can be specifically selected within the range of the corresponding parameters according to the quality of the hollow glass microspheres to be treated.
The invention also provides a modified hollow glass bead which is prepared by any one of the modification methods. The modified glass bead has good hydrophilicity and dispersibility and lower cost. The hollow glass bead can be applied to the technical field of development of gasoline wells.
The invention also provides low-density cement slurry which comprises the modified hollow glass microspheres. Specifically, the low-density cement slurry comprises the following components in parts by weight: 100 parts of G-grade oil well cement, 40-80 parts of modified hollow glass beads, 15-40 parts of reinforcing agent, 60-100 parts of water, 0.2-1.5 parts of dispersing agent, 2-4 parts of fluid loss additive, 0.5-4 parts of retarder and 0.1-1 part of defoaming agent.
Wherein, the reinforcing agent is selected from one or two of silicon powder and micro silicon; the dispersant is one or two of maleic anhydride and calcium lignosulfonate; the fluid loss agent is selected from one of sulfonated polyethylene toluene, methyl cellulose and methyl phenolic resin; the retarder is selected from one of sodium lignosulfonate, sodium tartrate and calcium gluconate; the defoaming agent is selected from one of glyceryl polyether and tributyl phosphate.
When the low-density cement paste is prepared, the defoaming agent and water are mixed, and then the rest raw materials are mixed and poured into the water solution of the defoaming agent to be stirred, so that the low-density cement paste is obtained.
The low-density cement slurry containing the modified hollow glass beads has good sedimentation stability, good fluidity, smaller water loss and lower permeability, can completely meet the construction requirement of on-site cement injection during the well cementation of a gasoline well, and has good mechanical strength of the large-temperature-difference low-density cement stone formed after being maintained in a constant-temperature water bath kettle at 90 ℃ for 2 days.
The invention only takes the modification of the hollow glass beads on the surfaces of the hollow glass beads, does not change the inherent performance of the hollow glass beads, does not need a dissolving agent and water, and is environment-friendly and pollution-free. The surface of the hollow glass bead is subjected to activation etching by a plasma treatment method, and then a polar group is specially introduced to the surface of the hollow glass bead by plasma grafting, so that the influence of the timeliness of the plasma treatment technology is eliminated, the dispersibility of the hollow glass bead is improved, the hydrophilicity of the hollow glass bead is improved, the interface binding power of the hollow glass bead and the low-density well cementing cement stone is increased, and the mechanical property of the low-density well cementing cement stone is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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.
Example 1
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 10g of 400-mesh hollow glass microspheres to be contained in a glassware to be evenly paved, placing the glassware in a cavity of a plasma processor, starting a power supply, starting a vacuum pump, opening a flow valve to put air when the vacuum degree in the cavity reaches 9Pa, and starting a high-frequency power supply to clean the hollow glass microspheres when the air flow rate is stabilized to 0.5L/min, wherein the power of the plasma processor is 50W; the cleaning process time was 60 s.
(2) Activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 9Pa, opening the flow valve to introduce oxygen, and starting a high-frequency power supply to activate the hollow glass beads when the oxygen flow is stabilized to 0.5L/min, wherein the power of the plasma treatment instrument is 100W; the activation treatment time was 100 s.
(3) Grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting acrylic acid gas (formed by gasifying 30% acrylic acid aqueous solution by mass fraction), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the acrylic acid gas is stabilized to 0.3L/min, wherein the power of a plasma treatment instrument is 150W; the activation treatment time was 300 s.
The modified hollow glass microspheres prepared in this example were G1.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G1, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to be 4000r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to prepare the low-density cement slurry 1 of the embodiment#。
Example 2
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 20g of 400-mesh hollow glass microspheres, placing the hollow glass microspheres in a glass ware, uniformly paving the glass ware, placing the glass ware in a cavity of a plasma treatment instrument, starting a power supply, starting a vacuum pump, opening a flow valve to introduce oxygen when the vacuum degree in the cavity reaches 9Pa, and starting a high-frequency power supply to clean the hollow glass microspheres when the oxygen flow is stabilized to 0.5L/min, wherein the power of the plasma treatment instrument is 120W; the cleaning treatment time is 100 s;
(2) activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 9Pa, opening the flow valve to introduce oxygen, and starting a high-frequency power supply to activate the hollow glass beads when the oxygen flow is stabilized to 0.3L/min, wherein the power of the plasma treatment instrument is 200W; the activation treatment time is 150 s;
(3) grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting ethylene glycol gas (formed by gasifying 50% of ethylene glycol aqueous solution by mass fraction), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the ethylene glycol gas is stabilized to 0.6L/min, wherein the power of a plasma treatment instrument is 180W; the activation treatment time was 350 s.
The modified hollow glass microspheres prepared in this example were G2.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G2, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to be 4200r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to prepare the low-density cement slurry 2 of the embodiment#。
Example 3
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 400-mesh hollow glass microspheres 15g, placing the hollow glass microspheres in a glassware, uniformly paving the glassware, placing the glassware in a cavity of a plasma treatment instrument, starting a power supply, starting a vacuum pump, opening a flow valve to place air when the vacuum degree in the cavity reaches 7Pa, and starting a high-frequency power supply to clean the hollow glass microspheres when the air flow rate is stabilized to 0.5L/min, wherein the power of the plasma treatment instrument is 100W; the cleaning treatment time is 80 s;
(2) activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 7Pa, opening the flow valve, putting a mixture of air and nitrogen, and starting a high-frequency power supply to carry out activation treatment on the hollow glass beads when the air flow rate is stabilized to 0.5L/min and the nitrogen flow rate is stabilized to 0.3L/min, wherein the power of the plasma treatment instrument is 150W; the activation treatment time is 100 s;
(3) grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting ethylene glycol gas (formed by gasifying 10% by mass of ethylene glycol aqueous solution), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the ethylene glycol gas is stabilized to 0.5L/min, wherein the power of a plasma treatment instrument is 120W; the activation treatment time was 500 s.
The modified hollow glass microspheres prepared in this example were G3.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G3, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to be 4200r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to prepare the low-density cement slurry 3 of the embodiment#。
Example 4
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 25g of 500-mesh hollow glass microspheres in a glass ware, uniformly paving the glass microspheres in the glass ware, putting the glass ware in a cavity of a plasma processor, starting a power supply, starting a vacuum pump, starting a flow valve to put a mixture of nitrogen and air when the vacuum degree in the cavity reaches 8Pa, starting a high-frequency power supply to clean the hollow glass microspheres when the flow of the nitrogen is stabilized to 0.4L/min and the flow of the air is stabilized to 0.6L/min, wherein the power of the plasma processor is 150W; the cleaning treatment time is 60 s;
(2) activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 8Pa, opening the flow valve, putting a mixture of air and oxygen, and starting a high-frequency power supply to carry out activation treatment on the hollow glass beads when the air flow is stabilized to 0.1L/min and the oxygen flow is stabilized to 0.2L/min, wherein the power of the plasma treatment instrument is 210W; the activation treatment time is 160 s;
(3) grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting acrylic acid gas (formed by gasifying 25% by mass of an acrylic acid aqueous solution), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the acrylic acid gas is stabilized to 0.2L/min, wherein the power of a plasma treatment instrument is 100W; the activation treatment time was 800 s.
The modified hollow glass microspheres prepared in this example were G4.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G4, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to 3800r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to obtain the low-density cement slurry 4 of the embodiment#。
Example 5
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 26g of 400-mesh hollow glass microspheres to be contained in a glass utensil to be uniformly paved, placing the glass microspheres in a cavity of a plasma treatment instrument, starting a power supply, starting a vacuum pump, opening a flow valve to introduce oxygen when the vacuum degree in the cavity reaches 5Pa, and starting a high-frequency power supply to clean the hollow glass microspheres when the oxygen flow is stabilized to 0.7L/min, wherein the power of the plasma treatment instrument is 200W; the cleaning treatment time is 80 s;
(2) activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 5Pa, opening the flow valve, introducing nitrogen, and starting a high-frequency power supply to perform activation treatment on the hollow glass beads when the flow of the nitrogen is stabilized to 0.5L/min, wherein the power of the plasma treatment instrument is 240W; the activation treatment time is 180 s;
(3) grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting ethylene glycol gas (formed by gasifying 65% of ethylene glycol aqueous solution by mass fraction), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the ethylene glycol gas is stabilized to 0.7L/min, wherein the power of a plasma treatment instrument is 160W; the activation treatment time was 1000 s.
The modified hollow glass microspheres prepared in this example were G5.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G5, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to 3900r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to obtain the low-density cement slurry 5 of the embodiment#。
Example 6
The hollow glass bead modification of the present example was performed according to the following steps:
1) cleaning treatment: selecting 26g of 400-mesh hollow glass microspheres to be contained in a glass utensil to be uniformly paved, placing the glass microspheres in a cavity of a plasma treatment instrument, starting a power supply, starting a vacuum pump, opening a flow valve to put air when the vacuum degree in the cavity reaches 5Pa, and starting a high-frequency power supply to clean the hollow glass microspheres when the air flow is stable to 0.3L/min, wherein the power of the plasma treatment instrument is 200W; the cleaning treatment time is 150 s;
(2) activation treatment: after the cleaning treatment is finished, keeping the vacuum degree of the cavity at 5Pa, opening the flow valve to discharge air, and starting a high-frequency power supply to carry out activation treatment on the hollow glass beads when the air flow is stabilized to 1.0L/min, wherein the power of the plasma treatment instrument is 160W; the activation treatment time is 135 s;
(3) grafting treatment: after the activation treatment is finished, placing the activated hollow glass beads in plasma grafting equipment, opening a flow valve under a vacuum condition, putting acrylic acid gas (formed by gasifying 10% acrylic acid aqueous solution by mass fraction), and starting a high-frequency power supply to graft the hollow glass beads when the flow of the acrylic acid gas is stabilized to 0.5L/min, wherein the power of a plasma treatment instrument is 220W; the activation treatment time was 700 s.
The modified hollow glass microspheres prepared in this example were G6.
The low-density cement slurry of the embodiment is prepared according to the following steps:
1) weighing 100 parts of G-grade oil well cement, 55 parts of modified hollow glass bead G6, 30 parts of micro silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to be 4000r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to prepare the low-density cement slurry 6 of the embodiment#。
Comparative example
The cement paste of the comparative example was prepared according to the following steps:
1) 100 parts of G-grade oil well cement, 55 parts of unmodified hollow glass beads (400 meshes), 30 parts of micro-silicon, 92 parts of water, 1 part of calcium lignosulphonate, 2.5 parts of sulfonated polyethylene toluene, 3 parts of sodium lignosulphonate and 0.5 part of tributyl phosphate are weighed.
2) Adding 0.5 part of tributyl phosphate into 92 parts of water, stirring and controlling the rotating speed to be 4000r/min, adding the mixture of the rest raw materials into the tributyl phosphate aqueous solution within 15s, and continuously stirring for 35s to obtain the cement of the comparative examplePulp 7#。
Test examples
The low-density cement paste 1 is mixed under normal pressure#～7#After curing for 48h at 90 ℃, the engineering performance is tested according to the GB/T19139-2003 standard, and the results are shown in the following Table 1.
TABLE 1 grout 1#～7#Engineering performance test results
"-": in the comparative example, the cement paste has serious layering phenomenon, and related parameters cannot be tested.
As can be seen from Table 1: the water loss of the low-density cement paste added with the modified hollow glass microspheres is about 45mL, and the modified hollow glass microspheres have increased surface activity and good hydrophilic property, so that the free liquid of the low-density cement paste is 0 (namely, the system is stable and has no layering phenomenon), and the compressive strength of the cement paste density is obviously enhanced.
Therefore, the modified hollow glass beads prepared by the invention can effectively enhance the stability and compressive strength of the cement paste density, effectively prevent the frequent occurrence of complex conditions such as pump holding in the well cementation construction process, and are beneficial to the well cementation quality and construction safety.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The method for modifying the hollow glass beads is characterized by comprising the following steps of:
1) putting hollow glass beads into a cavity of a plasma treatment instrument, adjusting the pressure in the cavity of the plasma treatment instrument to be below 9Pa, and then introducing cleaning gas into the cavity of the plasma treatment instrument to clean the hollow glass beads;
2) introducing an activating gas into the cavity of the plasma treatment instrument to activate the hollow glass beads after the cleaning treatment;
3) introducing grafting gas into the cavity of the plasma treatment instrument to perform grafting treatment on the hollow glass beads subjected to the binding activation treatment to generate modified hollow glass beads;
before the step 3), gasifying a glycol aqueous solution with the mass fraction of 5-95% to generate glycol gas;
the grafting gas is selected from ethylene glycol gas; controlling the flow of the grafting gas to be 0.1-1.0L/min;
when the grafting treatment is carried out, the power of the plasma treatment instrument is 100-300W, and the grafting treatment time is 300-1200 s;
the cleaning gas is selected from one or two of air, nitrogen and oxygen; controlling the flow rate of the cleaning gas to be 0.2-1.0L/min.
2. The modification method according to claim 1, wherein the power of the plasma processor is 50 to 300W and the duration of the cleaning process is 50 to 200 s.
3. The modification method according to claim 1, wherein the activating gas is selected from one or two of air, nitrogen and oxygen; controlling the flow rate of the activated gas to be 0.2-1.0L/min.
4. The modification method according to claim 1, wherein the power of the plasma treatment apparatus is 50 to 300W and the duration of the activation treatment is 100 to 300 s.
5. A modified hollow glass bead, characterized in that it is produced by the modification method according to any one of claims 1 to 4.
6. Use of the hollow glass microspheres of claim 5 in gasoline well development.
7. A low density cement slurry comprising the modified hollow glass microspheres of claim 5.
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| CN107502123A (en) * | 2017-09-21 | 2017-12-22 | 苏州振振好新型建材科技有限公司 | A kind of preparation method of environmentally friendly radiation proof interiro wall latex paint |
| CN108083737A (en) * | 2018-01-04 | 2018-05-29 | 西南石油大学 | A kind of light high strength concrete material and preparation method thereof |
| CN110256873A (en) * | 2019-07-10 | 2019-09-20 | 国网湖南省电力有限公司 | A kind of method that hollow glass micropearl surface is modified |
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