CN112409999A - Slurry with strong inhibition and strong lubricity as well as preparation method and application thereof - Google Patents
Slurry with strong inhibition and strong lubricity as well as preparation method and application thereof Download PDFInfo
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- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
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Abstract
The invention provides a mud with strong inhibition and strong lubricity, a preparation method and application thereof, and relates to the technical field of water-based drilling fluids. The invention provides a strong-inhibition strong-lubricity mud which comprises the following components in parts by weight: 100 parts of water; 0.05-0.07 part of lubricating drag reducer; 3-5 parts of a viscosity enhancer; 4-6 parts of an electropositive inhibitor; 0.04-0.06 part of flocculation coating agent. The high-inhibition and high-lubricity mud provided by the invention has unique lubrication resistance reduction performance, and plays roles in protecting a non-excavation tool bit and improving footage efficiency; the composite material has excellent inhibition performance, can inhibit hydration expansion of clay, and maintains the stability of the hole wall; a compact mud film can be formed, the filtration loss is reduced, and the soil pressure is balanced, so that the stability of the well wall is enhanced, the adhesion coefficient can be reduced, and the non-excavation tool bit mud bag is prevented; has good rheological property, filtration loss reduction performance and lubricity, can meet the requirement of trenchless drilling, and has the advantages of environmental protection and low cost.
Description
Technical Field
The invention relates to the technical field of water-based drilling fluid, in particular to strong-inhibition and strong-lubricity mud and a preparation method and application thereof.
Background
The clay stratum is a common stratum in the non-excavation tunneling process, when the clay stratum contains a large amount of water-sensitive minerals, the clay stratum absorbs water to expand and the hole wall is reduced in diameter, so that the drilling torque is increased, the drilling efficiency is reduced, and the hole wall instability accident can be caused in serious cases. When the conventional trenchless slurry is used for inhibiting a water-sensitive stratum, the influence of the inhibitor on bentonite in the slurry cannot be balanced, so that the bentonite in the slurry is flocculated and precipitated, the filtration loss is increased greatly, and the stratum is unstable.
Because the trenchless slurry is low in attention degree at night and limited in engineering budget, a trenchless slurry system which is easy to prepare and low in cost is not available for clay strata. Aiming at the problem of diameter reduction of a non-excavation clay stratum, a set of slurry system with low budget, simple allocation and strong inhibition becomes a scientific research problem to be solved urgently in the non-excavation field.
Disclosure of Invention
The invention aims to provide strong-inhibition strong-lubricity mud and a preparation method and application thereof, and the strong-inhibition strong-lubricity mud provided by the invention has excellent inhibition performance, can inhibit hydration expansion of clay and maintain the stability of a hole wall; in addition, the raw material components are cheap and easy to obtain, and the construction cost can be reduced.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a highly-inhibitive highly-lubricating slurry which comprises the following components in parts by weight:
100 parts of water;
0.05-0.07 part of lubricating drag reducer;
3-5 parts of a viscosity enhancer;
4-6 parts of an electropositive inhibitor;
0.04-0.06 part of flocculation coating agent.
Preferably, the lubricating drag reducer is a built surfactant.
Preferably, the compound surfactant comprises a surfactant SH300, a surfactant OP-40 and a surfactant FC 7910; the mass ratio of the surfactant SH300 to the surfactant OP-40 to the surfactant FC7910 is 10: 1-3: 1-5.
Preferably, the viscosity enhancer comprises LK vegetable gum and low-viscosity sodium carboxymethyl cellulose; the mass ratio of the LK plant gum to the low-viscosity sodium carboxymethyl cellulose is 1-3: 1.
Preferably, the electropositive inhibitor comprises electropositive gel MMH-2 and potassium chloride; the mass ratio of the positive electricity glue MMH-2 to the potassium chloride is 1: 5-10.
Preferably, the flocculating coating comprises polyacrylamide.
Preferably, the flocculating coating agent is a partially hydrolyzed polyacrylamide; the hydrolysis degree of the partially hydrolyzed polyacrylamide is 20-45%.
The invention provides a preparation method of strong-inhibition strong-lubricity mud, which comprises the following steps:
first mixing a lubricating drag reducer and water to obtain a first solution;
carrying out second mixing on the first solution and the viscosity enhancer to obtain a second solution;
and thirdly mixing the second solution, the electropositive inhibitor and the flocculation coating agent to obtain the slurry with strong inhibition and strong lubricity.
The invention also provides application of the strong-inhibition strong-lubricity mud prepared by the technical scheme or the preparation method in the technical scheme in a non-excavation clay stratum.
The invention provides a highly-inhibitive highly-lubricating slurry which comprises the following components in parts by weight: 100 parts of water; 0.05-0.07 part of lubricating drag reducer; 3-5 parts of a viscosity enhancer; 4-6 parts of an electropositive inhibitor; 0.04-0.06 part of flocculation coating agent. The high-inhibition and high-lubricity mud provided by the invention has unique lubrication resistance reduction performance, and plays roles in protecting a non-excavation tool bit and improving footage efficiency; the composite material has excellent inhibition performance, can inhibit hydration expansion of clay, and maintains the stability of the hole wall; the mud with strong inhibition and strong lubricity provided by the invention can form a compact mud film, reduce the filtration loss and balance the soil pressure, thereby enhancing the stability of the well wall, reducing the adhesion coefficient and preventing the non-excavation tool bit from mud wrapping; has good rheological property, filtration loss reduction performance and lubricity, can meet the requirement of trenchless drilling, and has the advantages of environmental protection and low cost.
Drawings
FIG. 1 is a graph comparing the swelling of highly inhibitive, highly lubricating muds prepared according to example 2 of the invention with conventional trenchless muds.
Detailed Description
The invention provides a highly-inhibitive highly-lubricating slurry which comprises the following components in parts by weight:
100 parts of water;
0.05-0.07 part of lubricating drag reducer;
3-5 parts of a viscosity enhancer;
4-6 parts of an electropositive inhibitor;
0.04-0.06 part of flocculation coating agent.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the invention, the mud with strong inhibition and strong lubricity comprises 100 parts of water by weight.
Based on the weight part of the water, the high-inhibition and high-lubricity mud provided by the invention comprises 0.05-0.07 part of lubricating drag reducer, and preferably 0.051-0.065 part of lubricating drag reducer. In the present invention, the lubricant drag reducer is preferably a built surfactant; the compound surfactant preferably comprises a surfactant SH300, a surfactant OP-40 and a surfactant FC 7910; the mass ratio of the surfactant SH300 to the surfactant OP-40 to the surfactant FC7910 is preferably 10: 1-3: 1-5, and more preferably 10:1: 2. In the invention, the polar end of the lubricating drag reducer is adsorbed on the surface of the clay to form a multilayer surfactant film, so that the friction between the original clay and the drilling tool is converted into the friction between the multilayer surfactant film and the drilling tool, and further, the pipeline friction resistance can be reduced, and the tunneling speed can be improved.
Based on the weight part of the water, the slurry with strong inhibition and strong lubricity provided by the invention comprises 3-5 parts of a viscosity enhancer, and preferably 4 parts of the viscosity enhancer. In the present invention, the viscosity enhancer preferably includes LK plant gum and low-viscosity sodium carboxymethyl cellulose (LV-CMC); the mass ratio of the LK plant gum to the low-viscosity sodium carboxymethyl cellulose is preferably 1-3: 1, and more preferably 3: 2. In the invention, the polysaccharide macromolecular substances contained in the LK plant gum and the hydrolyzed cellulose (the product after the LK plant gum is dissolved) can be mutually bridged and adsorbed on the surface of the mudstone under the action of osmotic pressure to form a compact film, so that the filtration loss is reduced, the cementation of the mudstone is improved, the mudstone expansion is reduced, and the stability of a hole wall is maintained; LV-CMC can adsorb and form the adsorbed layer on the clay surface to prevent the clay granule flocculation grow, can stabilize the fine particle that breaks apart under drilling fluid circulation stirring through the adsorption, no longer cohere into the large granule.
Based on the weight part of the water, the strongly-inhibitive and strongly-lubricating slurry provided by the invention comprises 4-6 parts of electropositive inhibitor, preferably 5 parts. In the present invention, the electropositive inhibitor preferably comprises electropositive gel MMH-2 and potassium chloride; the mass ratio of the positive photoresist MMH-2 to the potassium chloride is preferably 1: 5-10, and more preferably 1: 6-8. In the invention, the clay mineral in the reversed clay stratum is wetted by the compound surfactant, so that the hydrophilic surface of the clay is converted into the hydrophobic surface, and the application of the positive electricity gel MMH-2 and potassium ions is combined to compress a diffusion double electric layer hydration film of the clay, so that the absolute value of zeta potential is reduced, thereby inhibiting the hydration expansion of the clay and solving the problem of the diameter shrinkage of the non-excavation clay stratum.
Based on the weight part of the water, the strong-inhibition and strong-lubricity mud provided by the invention comprises 0.04-0.06 part of flocculation coating agent, and preferably 0.05 part of flocculation coating agent. In the present invention, the flocculating coating agent preferably comprises polyacrylamide, more preferably partially hydrolyzed polyacrylamide; the hydrolysis degree of the partially hydrolyzed polyacrylamide is preferably 20-45%, and more preferably 30-40%. In the invention, the flocculation coating agent polyacrylamide can selectively capture and aggregate fine inert rock debris in mud through an ionized group and a linear flexible chain of the polyacrylamide.
The high-inhibition and high-lubricity mud provided by the invention has unique lubrication resistance reduction performance, and plays roles in protecting a non-excavation tool bit and improving footage efficiency; the stability of the hole wall is enhanced through the micropore plugging effect of the compounded surfactant and the positive electricity inhibition of the positive electricity glue, so that the problem of instability of the hole wall of the shrinkage hole of the non-excavation clay stratum is solved; moreover, the slurry with strong inhibition and strong lubricity provided by the invention meets the requirement of environmental protection and has lower cost.
The invention also provides a preparation method of the mud with strong inhibition and strong lubricity, which comprises the following steps:
first mixing a lubricating drag reducer and water to obtain a first solution;
carrying out second mixing on the first solution and the viscosity enhancer to obtain a second solution;
and thirdly mixing the second solution, the electropositive inhibitor and the flocculation coating agent to obtain the slurry with strong inhibition and strong lubricity.
The invention first mixes the lubricant drag reducer and water to obtain a first solution.
The preparation method provided by the invention is simple, convenient and easy to operate, and is suitable for large-scale popularization and application.
The invention first mixes the lubricant drag reducer and water to obtain a first solution. In the invention, the first mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 80-150 r/min, and more preferably 100-120 r/min; the stirring time is preferably 5-20 min, and more preferably 10-15 min.
After the first solution is obtained, the first solution and the viscosity enhancer are subjected to second mixing to obtain a second solution. In the invention, the second mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 400-1000 r/min, and more preferably 600-800 r/min; the stirring time is preferably 25-40 min, more preferably 30-35 min, and the stirring time is counted from the complete addition of the viscosity enhancing agent. In the present invention, when the viscosity enhancer is LK plant gum and low-viscosity sodium carboxymethyl cellulose, the second mixing method is preferably: LK plant gum and the first solution were mixed first, and then the resulting mixed solution was mixed with low-viscosity sodium carboxymethyl cellulose. In the specific embodiment of the invention, LK vegetable gum is firstly added into the first solution, and is stirred for 30min under the condition of 600 r/min; continuously adding low-viscosity sodium carboxymethyl cellulose, and stirring for 30min at the speed of 600 r/min.
After the second solution is obtained, the second solution, the electropositive inhibitor and the flocculation coating agent are subjected to third mixing to obtain the slurry with strong inhibition and strong lubricity. The present invention preferably adds to the second solution, in order, an electropositive suppressor and a flocculating coating agent. In the invention, the third mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 400-1000 r/min, and more preferably 600-800 r/min; the stirring time is preferably 40-90 min, and more preferably 60-70 min.
The invention also provides application of the strong-inhibition strong-lubricity mud prepared by the technical scheme or the preparation method in the technical scheme in a non-excavation clay stratum. The method of application preferably comprises: in the trenchless construction preparation stage, the highly-inhibitive and highly-lubricating mud of the technical scheme is configured, and in the trenchless guide drilling and hole expanding stage, the highly-inhibitive and highly-lubricating mud of the technical scheme is circulated in the drill hole.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
In the examples, the raw material components used were:
the surfactant SH300 is produced by Jiangxi Union chemical Co., Ltd;
surfactant OP-40, the manufacturer is Jiangxi Unico chemical Co., Ltd;
the surfactant FC7910 is produced by Jiangxi Unico chemical Co., Ltd;
the LK plant gum is produced by Jiangxi Union chemical engineering Co.Ltd;
low viscosity sodium carboxymethylcellulose (LV-CMC), the manufacturer is Jiangxi Unico chemical industry Co.Ltd;
positive charged glue MMH-2, the manufacturer is Rongsheng chemical company Limited;
polyacrylamide (HPAM) with 30 percent of hydrolysis degree, and the manufacturer is Jiangxi Unico chemical Co.
Example 1
Adding 0.5g of surfactant SH300, 0.05g of surfactant OP-40 and 0.1g of surfactant FC7910 into 1000mL of water, stirring for 10min at the rotating speed of 100r/min, and uniformly stirring to obtain a first solution;
adding 30g of LK plant gum into the first solution under the stirring condition of 600r/min, stirring for 30min, uniformly stirring and fully dissolving, continuously adding 20g of LV-CMC, and stirring for 30min to obtain a second solution;
under the condition of stirring at the rotating speed of 600r/min, 5.4g of MMH-2, 54g of potassium chloride and 0.6g of HPAM are sequentially added into the second solution, and stirring is carried out for 1 hour, so as to obtain the slurry with strong inhibition and strong lubricity.
Example 2
Adding 0.39g of surfactant SH300, 0.04g of surfactant OP-40 and 0.08g of surfactant FC7910 into 1000mL of water, stirring for 10min at the rotating speed of 100r/min, and uniformly stirring to obtain a first solution;
adding 24g of LK plant gum into the first solution under the stirring condition of 600r/min, stirring for 30min, uniformly stirring and fully dissolving, continuously adding 16g of LV-CMC, and stirring for 30min to obtain a second solution;
under the condition of stirring at the rotating speed of 600r/min, 4g of MMH-2, 40g of potassium chloride and 0.4g of HPAM are sequentially added into the second solution, and stirring is carried out for 1 hour, so that the slurry with strong inhibition and strong lubricity is obtained.
Example 3
Adding 0.54g of surfactant SH300, 0.05g of surfactant OP-40 and 0.11g of surfactant FC7910 into 1000mL of water, stirring for 10min at the rotating speed of 100r/min, and uniformly stirring to obtain a first solution;
adding 30g of LK plant gum into the first solution under the stirring condition of 600r/min, stirring for 30min, uniformly stirring and fully dissolving, continuously adding 20g of LV-CMC, and stirring for 30min to obtain a second solution;
under the condition of stirring at the rotating speed of 600r/min, 5.4g of MMH-2, 54g of potassium chloride and 0.6g of HPAM are sequentially added into the second solution, and stirring is carried out for 1 hour, so as to obtain the slurry with strong inhibition and strong lubricity.
Test example 1 evaluation of basic Properties of slurry
Comparing the slurry with strong inhibition and strong lubricity prepared in the embodiment 1-3 with the common trenchless slurry; the general trenchless slurry formula is as follows: calculated according to the adding amount of water of each 1000mL, the sodium bentonite is 60 g.
The basic performance parameters of the slurry with strong inhibition and strong lubricity prepared in the embodiment 1-3 of the invention are tested, and the common non-excavation slurry is used for comparison, and the data analysis is shown in table 1;
the general trenchless slurry formula is as follows: calculated according to the adding amount of water of each 1000mL, the sodium bentonite is 60 g.
An experimental instrument: ZNN-D6S type six-speed rotational viscometer, ZNS-5A medium pressure water loss instrument and Su's funnel.
TABLE 1 comparison of basic Performance parameters of the slurries
As can be seen from Table 1, compared with the common trenchless slurry, the slurry with strong inhibition and strong lubricity provided by the invention has high viscosity, the highest funnel viscosity reaches 80s, and the filtration loss is small and is only 4.4mL at the lowest.
Test example 2 evaluation of lubricity of slurry
An experimental instrument: EP extreme pressure lubricator.
The experimental method comprises the following steps: the highly-inhibitive and highly-lubricating slurry prepared in the examples 1 to 3 was poured into a sample cup of an EP extreme pressure lubricator, the lubricating coefficient was measured, and compared with that of clear water and 4% bentonite slurry, and the results are shown in Table 2.
TABLE 2 lubricating coefficient of the slurries
| Type of slurry | Coefficient of lubricity |
| Clean water | 0.34 |
| 4% bentonite slurry | 0.46 |
| Example 1 | 0.13 |
| Example 2 | 0.16 |
| Example 3 | 0.14 |
As can be seen from Table 2, the strongly-inhibitive, highly-lubricating mud provided by the present invention has a much lower coefficient of lubrication than conventional trenchless mud.
Test example 3 evaluation of mud inhibition Properties
An experimental instrument: HTP-2A high-temperature high-pressure expansion tester.
The experimental method comprises the following steps: the slurry with strong inhibition and strong lubricity prepared in the example 2 and the conventional trenchless slurry are respectively poured into sample cups of an HTP-2A high-temperature high-pressure expansion tester, the expansion amount is tested and compared, and the result is shown in figure 1;
the conventional trenchless slurry formulation is as follows: calculated according to the adding amount of water of each 1000mL, the sodium bentonite is 60 g.
As can be seen from FIG. 1, the swelling capacity of the highly-inhibitive highly-lubricating mud provided by the invention is far lower than that of the conventional trenchless mud, which shows that the highly-inhibitive highly-lubricating mud has extremely strong inhibitability.
Test example 4 evaluation of toxicity of slurry
An experimental instrument: microplate multifunctional detector (GloMax-Multi2011 ZSIIR 0369 US).
The experimental method comprises the following steps: uniformly mixing the strongly-inhibitive and strongly-lubricating mud prepared in the examples 1-3 with a 3.0% NaCl solution according to a volume ratio of 1:9, standing for 60min, taking the middle-layer suspension as a test solution, diluting the test solution into different concentrations, adopting standard strains, respectively measuring the luminosity of the test solution with different concentrations relative to the 3.0% NaCl solution by using a biotoxicity tester, and when the relative luminosity of luminous bacteria is reduced by half, recording the concentration of the test solution as LC50 of the drilling fluid, wherein the classification standard of the biotoxicity grade is shown in Table 3.
TABLE 3 Biotoxicity rating Classification criteria
Tests prove that LC50 of the slurry with strong inhibition and strong lubricity prepared in the examples 1-3 is 322000ppm, reaches the emission standard, and shows that the slurry has good environmental protection property.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The mud with strong inhibition and strong lubricity comprises the following components in parts by weight:
100 parts of water;
0.05-0.07 part of lubricating drag reducer;
3-5 parts of a viscosity enhancer;
4-6 parts of an electropositive inhibitor;
0.04-0.06 part of flocculation coating agent.
2. A strongly-inhibiting, highly-lubricating mud as set forth in claim 1 wherein said lubricant drag reducer is a built surfactant.
3. A strongly-inhibiting highly-lubricating mud as claimed in claim 2, wherein the built surfactant comprises surfactant SH300, surfactant OP-40 and surfactant FC 7910; the mass ratio of the surfactant SH300 to the surfactant OP-40 to the surfactant FC7910 is 10: 1-3: 1-5.
4. A highly inhibitive highly lubricating mud as claimed in claim 1, wherein said viscosity enhancing agent comprises LK vegetable gum and low viscosity sodium carboxymethylcellulose; the mass ratio of the LK plant gum to the low-viscosity sodium carboxymethyl cellulose is 1-3: 1.
5. A strongly-inhibiting highly-lubricating mud as claimed in claim 1, wherein the electropositive inhibitor comprises electropositive gel MMH-2 and potassium chloride; the mass ratio of the positive electricity glue MMH-2 to the potassium chloride is 1: 5-10.
6. A strongly-inhibiting highly-lubricating mud as claimed in claim 1, wherein the flocculating coating comprises polyacrylamide.
7. A strongly-inhibiting highly-lubricating mud as claimed in claim 6, wherein the flocculating coating agent is a partially hydrolyzed polyacrylamide; the hydrolysis degree of the partially hydrolyzed polyacrylamide is 20-45%.
8. The preparation method of the strongly-inhibitive and highly-lubricating mud of any one of claims 1 to 7 comprises the following steps:
first mixing a lubricating drag reducer and water to obtain a first solution;
carrying out second mixing on the first solution and the viscosity enhancer to obtain a second solution;
and thirdly mixing the second solution, the electropositive inhibitor and the flocculation coating agent to obtain the slurry with strong inhibition and strong lubricity.
9. The application of the highly-inhibitive highly-lubricating mud of any one of claims 1 to 7 or the highly-inhibitive highly-lubricating mud prepared by the preparation method of claim 8 in a non-excavated clay formation.
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| CN102477287A (en) * | 2010-12-08 | 2012-05-30 | 深圳市钻通工程机械股份有限公司 | Drilling fluid and composite additive |
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2020
- 2020-11-19 CN CN202011300778.6A patent/CN112409999B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1618922A (en) * | 2002-11-21 | 2005-05-25 | 中国石油化工股份有限公司 | Positive electricity production well treatment liquid and its preparation method |
| CN102477287A (en) * | 2010-12-08 | 2012-05-30 | 深圳市钻通工程机械股份有限公司 | Drilling fluid and composite additive |
| CN108070365A (en) * | 2017-12-14 | 2018-05-25 | 贵州省地质矿产勘查开发局五地质大队 | Water-based drilling fluid suitable for coal-series stratum drilling and preparation method thereof |
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| 左晨晓等: "塔里木轮古7井区钻井液的评价与改进研究", 《石油化工应用》 * |
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