CN112080260A - Polyamine strong-inhibition water-based drilling fluid system and preparation method thereof - Google Patents
Polyamine strong-inhibition water-based drilling fluid system and preparation method thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 99
- 239000012530 fluid Substances 0.000 title claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229920000768 polyamine Polymers 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 230000005764 inhibitory process Effects 0.000 claims abstract description 46
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 112
- 229920000642 polymer Polymers 0.000 claims description 53
- 239000002002 slurry Substances 0.000 claims description 48
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 29
- 239000003292 glue Substances 0.000 claims description 26
- 230000000694 effects Effects 0.000 claims description 21
- 150000003839 salts Chemical class 0.000 claims description 20
- 239000002981 blocking agent Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000000706 filtrate Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 16
- 239000000654 additive Substances 0.000 claims description 15
- 230000000996 additive effect Effects 0.000 claims description 15
- 239000003112 inhibitor Substances 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 239000000440 bentonite Substances 0.000 claims description 14
- 229910000278 bentonite Inorganic materials 0.000 claims description 14
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- 150000001412 amines Chemical class 0.000 claims description 11
- 239000004816 latex Substances 0.000 claims description 11
- 229920000126 latex Polymers 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 9
- -1 small molecule amine Chemical class 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims 1
- 239000004927 clay Substances 0.000 abstract description 9
- 230000036571 hydration Effects 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 25
- 230000000536 complexating effect Effects 0.000 description 7
- 238000005457 optimization Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000007771 core particle Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- C—CHEMISTRY; METALLURGY
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of preparation of water-based drilling fluid for oil fields, in particular to a polyamine strong inhibition water-based drilling fluid system and a preparation method thereof. The invention is a polyamine strong inhibition water-based drilling fluid system, which has super strong inhibition performance, solves the hydration problem of clay surface, has good rheological property and well wall stability, resists temperature of more than 180 ℃, can resist saturated saline water, and has wide density controllable range (1.1 g/cm)3To 2.3g/cm3) The method is environment-friendly and zero-emission, and can realize rapid, high-quality and safe drilling.
Description
Technical Field
The invention relates to the technical field of preparation of water-based drilling fluid for oil fields, in particular to a polyamine strong-inhibition water-based drilling fluid system and a preparation method thereof.
Background
With the rapid development of economy in China, the demand for energy is getting larger and larger, and petroleum is still an important component of energy. With the increasing drilling depth, the drilling of the stratum is increasingly complex, and the requirement of the drilling operation on the drilling fluid treatment agent is higher and higher; in addition, environmental protection is increasingly emphasized all over the world, and environmental-friendly drilling fluid is widely concerned. The oil-based drilling fluid has the remarkable advantages of high temperature resistance, good lubricating effect and strong inhibiting performance when solving the problem of complex drilling conditions, particularly deep wells and ultra-deep wells. But the problems of post-treatment and discharge of the oil-based drilling fluid and environmental pollution are difficult to solve. Therefore, high performance amine-based polymer water-based drilling fluids are rapidly being developed.
Disclosure of Invention
The invention provides a polyamine strong inhibition water-based drilling fluid system and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of clay surface hydration, post-treatment and discharge of oil-based drilling fluid and serious environmental pollution.
One of the technical schemes of the invention is realized by the following measures: the polyamine strong inhibition water-based drilling fluid system comprises, by weight, 1000 parts of water, 20-40 parts of bentonite for drilling fluid, 2-5 parts of anhydrous sodium carbonate, 2-8 parts of a coating agent, 10-30 parts of a shale inhibitor, 20-60 parts of a fluid loss additive, 40-80 parts of a blocking agent and 150-300 parts of an activity regulator.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the preparation method comprises the following steps: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
The coating agent is high molecular amino polymer XZ-102.
The shale inhibitor is a micromolecular amino polymer XZ-301.
The blocking agent is a product of salt-resistant nano deformable polymer latex XZ-601 and chemical blocking agent complexing aluminum ZK-303 which are stirred for 2 to 4 hours at a weight ratio of 1:1 to 3 at 300 to 600 rpm.
The filtrate reducer is a product obtained by stirring a temperature-resistant deformable amino polymer filtrate reducer XZ-501A and a salt-resistant deformable amino polymer filtrate reducer XZ-501B at a weight ratio of 1: 1-3 at 1000 rpm-2000 rpm for 0.5 h-1 h.
The activity regulator is a compound salt prepared from NaCl and KCl according to the mass part ratio of 7: 3.
The second technical scheme of the invention is realized by the following measures: a preparation method of a polyamine strong inhibition water-based drilling fluid system comprises the following steps: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
The following is further optimization or/and improvement of the second technical scheme of the invention:
the coating agent is a high molecular amino polymer XZ-102; or/and the shale inhibitor is a small molecular amino polymer XZ-301; or/and the activity regulator is a compound salt prepared from NaCl and KCl according to the mass part ratio of 7: 3.
The encapsulation blocking agent is a first mixture obtained by stirring salt-resistant nano deformable polymer latex XZ-601 and chemical blocking agent complexing aluminum ZK-303 for 2 to 4 hours at a weight ratio of 1:1 to 3 at 300 to 600 rpm; or/and the fluid loss additive is a second mixture obtained by stirring a temperature-resistant deformable amine-based polymer fluid loss additive XZ-501A and a salt-resistant deformable amine-based polymer fluid loss additive XZ-501B at a weight ratio of 1: 1-3 at 1000 rpm-2000 rpm for 0.5 h-1.
The invention relates to a polyamine strong inhibition water-based drilling fluid system and a preparation method thereof, the system has super strong inhibition performance, solves the problem of clay surface hydration, has good rheological property and well wall stability, resists temperature of more than 180 ℃, resists saturated saline water, and has wide density controllable range (1.1 g/cm)3To 2.3g/cm3) The method is environment-friendly and zero-emission, and can realize rapid, high-quality and safe drilling.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the present invention is an aqueous solution in which the solvent is water, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to the following examples:
example 1: the polyamine strong inhibition water-based drilling fluid system comprises, by weight, 1000 parts of water, 20-40 parts of bentonite for drilling fluid, 2-5 parts of anhydrous sodium carbonate, 2-8 parts of a coating agent, 10-30 parts of a shale inhibitor, 20-60 parts of a fluid loss additive, 40-80 parts of a blocking agent and 150-300 parts of an activity regulator.
The invention uses amino large, medium and small molecular polymers to form the drilling fluid consisting of amino treating agents, thereby not only improving the inhibition of the water-based drilling fluid, but also enhancing the stability and the compatibility. In addition, the polyamine strong inhibition water-based drilling fluid system provided by the invention not only maintains the advantages of the water-based drilling fluid, but also achieves the advantages of safe and rapid drilling compared with the oil-based drilling fluid. The invention not only solves the problem of environmental protection, but also reduces the drilling cost, and is a universal high-quality water-based drilling fluid system.
The amino group is introduced into the molecular chain of the macromolecular amino polymer, the medium molecular amino polymer and the small molecular amino polymer, so that the adsorption performance of the polymer is improved, the acting force with clay is enhanced, and the drilling fluid consisting of the polyamine-based treating agent is formed. The invention has strong inhibition effect on the dispersion of clay in water due to the fact that amido ions are easy to be embedded into the clay unit cell and form strong electric adsorption with the negative charge of the clay and the coating effect of macromolecules.
Example 2: the polyamine strong inhibition water-based drilling fluid system comprises, by weight, 1000 parts of water, 20 parts or 40 parts of bentonite for drilling fluid, 2 parts or 5 parts of anhydrous sodium carbonate, 2 parts or 8 parts of a coating agent, 10 parts or 30 parts of a shale inhibitor, 20 parts or 60 parts of a fluid loss additive, 40 parts or 80 parts of a blocking agent, and 150 parts or 300 parts of an activity regulator.
Example 3: the polyamine strong inhibition water-based drilling fluid system is obtained according to the following steps: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
Example 4: as optimization of the above embodiment, the coating agent is high molecular amino polymer XZ-102.
Example 5: as optimization of the embodiment, the shale inhibitor is a small molecule amine-based polymer XZ-301.
Example 6: as an optimization of the above example, the blocking agent is the product of the salt-resistant nano deformable polymer latex XZ-601 and the chemical blocking agent complexed aluminum ZK-303 stirred at a weight ratio of 1:1 to 3 at 300rpm to 600rpm for 2h to 4 h. The invention realizes the super strong plugging effect by utilizing the dual functions of the physical plugging property of the nano latex polymer and the chemical plugging property of the chemical plugging agent complexing aluminum ZK-601 pH effect. The salt-resistant nano deformable polymer latex XZ-601 is flexible spherical particles containing hard cores, the particle size of the particles is distributed in the range from nano to submicron, the particles are adsorbed on the surface of a well wall to form a smooth nano oil film, the friction coefficient is low, the wear-resistant pressure-bearing capacity is high, and meanwhile, the nano hard core particles are spherical, so that the rolling lubrication effect can be achieved, and the lubricity of the drilling fluid can be effectively improved. The system does not need to additionally add a lubricant, and is beneficial to environmental protection and cost control.
Example 7: as optimization of the above example, the fluid loss additive is a product of stirring the temperature-resistant deformable amine-based polymer fluid loss additive XZ-501A and the salt-resistant deformable amine-based polymer fluid loss additive XZ-501B at a weight ratio of 1:1 to 3 at 1000rpm to 2000rpm for 0.5h to 1 h.
Example 8: as optimization of the above embodiment, the activity regulator is a compound salt prepared from NaCl and KCl according to the mass part ratio of 7: 3.
Example 9: the preparation method of the polyamine strong inhibition water-based drilling fluid system comprises the following steps: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
Example 10: the polyamine strong inhibition water-based drilling fluid system is obtained according to the following steps: step one, adding 2g of anhydrous sodium carbonate and 20g of bentonite for drilling fluid into 500mL of water at room temperature, stirring for 1h at the rotating speed of 600rpm, and standing for 16h to 24h to obtain base slurry A1; secondly, taking 500mL of water, adding 2g of macromolecular amino polymer XZ-102 and 10g of micromolecular amino polymer XZ-301 while stirring at the rotating speed of 600rpm, and stirring for 3 hours to fully dissolve to obtain a glue solution B1; thirdly, taking the base slurry A1, adding 20g of temperature-resistant deformable amino polymer filtrate reducer XZ-501A and 40g of salt-resistant deformable amino polymer filtrate reducer XZ-501B while stirring at the rotating speed of 600rpm, stirring for 20min, then adding 30g of salt-resistant nano deformable polymer latex XZ-601 and 40g of chemical blocking agent complexing aluminum ZK-303 while stirring, and stirring for 20min to obtain slurry C1; and fourthly, taking the mud C1, stirring and flushing the mud C1 into the glue solution B while stirring at the rotating speed of 600rpm, stirring for 20min to fully mix, then adding 210g of NaCl and 90g of KCl, and stirring for 1h to obtain the polyamine strong inhibition water-based drilling fluid system.
Example 11: the polyamine strong inhibition water-based drilling fluid system is obtained according to the following steps: step one, adding 3g of anhydrous sodium carbonate and 30g of bentonite for drilling fluid into 500mL of water at room temperature, stirring for 1h at the rotating speed of 600rpm, and standing for 16h to 24h to obtain base slurry A2; secondly, taking 500mL of water, adding 4g of high molecular amino polymer XZ-102 and 20g of small molecular amino polymer XZ-301 while stirring at the rotating speed of 600rpm, and stirring for 3 hours to fully dissolve the water to obtain a glue solution B2; thirdly, taking the base slurry A2, adding 10g of temperature-resistant deformable amino polymer filtrate reducer XZ-501A and 30g of salt-resistant deformable amino polymer filtrate reducer XZ-501B while stirring at the rotating speed of 600rpm, stirring for 20min, then adding 30g of salt-resistant nano deformable polymer latex XZ-601 and 30g of chemical blocking agent complexing aluminum ZK-303 while stirring, and stirring for 20min to obtain slurry C2; and fourthly, taking the mud C2, stirring and flushing the mud C2 into the glue solution B while stirring at the rotating speed of 600rpm, stirring for 20min to fully mix, then adding 175g of NaCl and 75g of KCl, and stirring for 1h to obtain the polyamine strong inhibition water-based drilling fluid system.
Example 12: the polyamine strong inhibition water-based drilling fluid system is obtained according to the following steps: step one, adding 4g of anhydrous sodium carbonate and 40g of bentonite for drilling fluid into 500mL of water at room temperature, stirring for 1h at the rotating speed of 600rpm, and standing for 16h to 24h to obtain base slurry A3; secondly, taking 500mL of water, adding 6g of macromolecular amino polymer XZ-102 and 30g of micromolecular amino polymer XZ-301 while stirring at the rotating speed of 600rpm, and stirring for 3 hours to fully dissolve to obtain a glue solution B3; thirdly, taking the base slurry A3, adding 15g of temperature-resistant deformable amino polymer filtrate reducer XZ-501A and 15g of salt-resistant deformable amino polymer filtrate reducer XZ-501B while stirring at the rotating speed of 600rpm, stirring for 20min, then adding 20g of salt-resistant nano deformable polymer latex XZ-601 and 20g of chemical blocking agent complexing aluminum ZK-303 while stirring, and stirring for 20min to obtain slurry C3; and fourthly, taking the mud C3, stirring and flushing the mud C3 into the glue solution B while stirring at the rotating speed of 600rpm, stirring for 20min to fully mix, then adding 140g of NaCl and 60g of KCl, and stirring for 1h to obtain the polyamine strong inhibition water-based drilling fluid system.
Example 13: the polyamine strong inhibition water-based drilling fluid system is obtained according to the following steps: step one, adding 5g of anhydrous sodium carbonate and 30g of bentonite for drilling fluid into 500mL of water at room temperature, stirring for 1h at the rotation speed of 600rpm, and standing overnight to obtain base slurry A4; secondly, taking 500mL of water, adding 8g of high molecular amino polymer XZ-102 and 25g of small molecular amino polymer XZ-301 while stirring at the rotating speed of 600rpm, and stirring for 3 hours to fully dissolve the water to obtain a glue solution B4; thirdly, taking the base slurry A4, adding 10g of temperature-resistant deformable amino polymer filtrate reducer XZ-501A and 10g of salt-resistant deformable amino polymer filtrate reducer XZ-501B while stirring at the rotating speed of 600rpm, stirring for 20min, then adding 45g of salt-resistant nano deformable polymer latex XZ-601 and 35g of chemical blocking agent complexing aluminum ZK-303 while stirring, and stirring for 20min to obtain slurry C4; and fourthly, taking the mud C4, stirring and flushing the mud C4 into the glue solution B while stirring at the rotating speed of 600rpm, stirring for 20min to fully mix, then adding 105g of NaCl and 45g of KCl, and stirring for 1h to obtain the polyamine strong inhibition water-based drilling fluid system.
The polyamine strongly inhibited aqueous drilling fluid systems obtained according to the procedures described in examples 10 to 13 were tested for relevant performance indicators, and the data are shown in table 1. Wherein AV is apparent viscosity, PV is plastic viscosity, YP is yield value, G is static shear force, FLAPIIs API filtration loss, FLHTHPThe high-temperature high-pressure filtration loss.
As can be seen from the attached table 1, the apparent viscosity and the plastic viscosity of the polyamine strong inhibition water-based drilling fluid system provided by the invention are lower than those of other water-based drilling fluids, which shows that the polyamine strong inhibition water-based drilling fluid system provided by the invention has better fluidity, and simultaneously reduces the shear force relative to other water-based drilling fluids, so that the influence on a drilling tool in field application is smaller, and the occurrence of complex underground accidents can be reduced.
As can be seen from the attached Table 1, the FL of the polyamine strong inhibition water-based drilling fluid system provided by the inventionAPIAnd FLHTHPCompared with other water-based drilling fluids, the polyamine strong-inhibition water-based drilling fluid system provided by the invention is reduced, and can form a compact film on a well wall during drilling, so that the mutual filtration loss between the drilling fluid and the well wall is reduced, the stable performance of the drilling fluid can be ensured, and the viscosity cannot be greatly increased.
As can be seen from the attached table 1, the shale recovery rate of the polyamine strong inhibition water-based drilling fluid system provided by the invention is close to that of an oil-based drilling fluid, and is the top level of the existing water-based drilling fluid, so that the polyamine strong inhibition water-based drilling fluid system provided by the invention has excellent inhibition performance, can inhibit hydration and dispersion of clay, can better carry drill cuttings to return in the drilling process, and maintains the performance of the drilling fluid.
As can be seen from the attached table 1, the sand bed invasion depth of the polyamine strong inhibition water-based drilling fluid system provided by the invention is less compared with that of other water-based drilling fluids, and the result shows that aiming at cracks and cores with different pores, the polyamine strong inhibition water-based drilling fluid system provided by the invention has better plugging capability, can quickly form a plugging film, enhances the plugging strength of an inner mud cake, greatly improves the bearing capacity of the core, enlarges a safe density window, and better prevents the occurrence of leakage, drilling sticking and collapse.
In conclusion, the invention realizes the super-strong inhibition and the well wall stability by utilizing the strong inhibition of the amino group and the physical and chemical synergistic plugging, and solves the problem of the hydration of the surfaces of the clay and the drill cuttings. The inhibitive performance of the water-based drilling fluid is improved, the stability and the compatibility are enhanced, the advantages of the water-based drilling fluid are maintained, and the performance equivalent to that of the oil-based drilling fluid is achieved.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. The polyamine strong-inhibition water-based drilling fluid system is characterized by comprising, by weight, 1000 parts of water, 20-40 parts of bentonite for drilling fluid, 2-5 parts of anhydrous sodium carbonate, 2-8 parts of a coating agent, 10-30 parts of a shale inhibitor, 20-60 parts of a filtrate reducer, 40-80 parts of a blocking agent and 150-300 parts of an activity regulator.
2. The polyamine strongly inhibited water-based drilling fluid system according to claim 1, which is obtained by the following steps: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
3. The strong polyamine inhibition aqueous drilling fluid system according to claim 1 or 2, wherein the coating agent is a high molecular weight amine based polymer XZ-102.
4. The strong polyamine inhibition aqueous based drilling fluid system according to claim 1, 2 or 3, wherein the shale inhibitor is small molecule amine based polymer XZ-301.
5. The polyamine strong inhibition aqueous based drilling fluid system according to claim 1 or 2 or 3 or 4, wherein the blocking agent is a first mixture obtained by reacting the salt-resistant nano deformable polymer latex XZ-601 and the chemical blocking agent complexed aluminum ZK-303 in a weight ratio of 1:1 to 3 after stirring at 300rpm to 600rpm for 2h to 4 h.
6. The polyamine strong inhibition water-based drilling fluid system according to any one of claims 1 to 5, wherein the fluid loss additive is a first mixture obtained by stirring a temperature-resistant deformable amine-based polymer fluid loss additive XZ-501A and a salt-resistant deformable amine-based polymer fluid loss additive XZ-501B at a weight ratio of 1:1 to 3 at 1000rpm to 2000rpm for 0.5h to 1 h.
7. The polyamine strong inhibition water-based drilling fluid system according to any one of claims 1 to 6, wherein the activity regulator is a composite salt prepared by NaCl and KCl according to the mass part ratio of 7: 3.
8. A method of preparing a polyamine high inhibition aqueous based drilling fluid system according to claim 1, comprising the steps of: the first step, dividing the required amount of the horizontal slurry into two parts, adding the required amount of bentonite for the drilling fluid and anhydrous sodium carbonate into one part of the horizontal slurry at room temperature, stirring for 1 to 3 hours at the rotating speed of 300 to 600rpm, and standing for 16 to 24 hours to obtain base slurry A; taking another part of water, adding the required amount of coating agent and shale inhibitor while stirring at the rotating speed of 300-600 rpm, and stirring for 3-6 h to obtain a glue solution B; thirdly, taking the base slurry A, stirring and adding the required amount of filtrate reducer at the rotation speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of plugging agent while stirring, and stirring for 20-40 min to obtain slurry C; and fourthly, adding the slurry C into the glue solution B under the condition of stirring at the rotating speed of 300-600 rpm, stirring for 20-40 min, adding the required amount of activity regulator into the glue solution B, and stirring for 2-4 h to obtain the polyamine strong inhibition water-based drilling fluid system.
9. The method of claim 8 wherein the coating agent is a high molecular amine based polymer XZ-102; or/and the shale inhibitor is a small molecular amino polymer XZ-301; or/and the activity regulator is a compound salt prepared from NaCl and KCl according to the mass part ratio of 7: 3.
10. The preparation method of the polyamine strong inhibition water-based drilling fluid system according to claim 8 or 9, wherein the blocking agent is a first mixture obtained by a reaction of salt-resistant nano deformable polymer latex XZ-601 and chemical blocking agent complex aluminum ZK-303 at a weight ratio of 1:1 to 3 and stirring at 300rpm to 600rpm for 2h to 4 h; or/and the fluid loss additive is a second mixture obtained by stirring a temperature-resistant deformable amine-based polymer fluid loss additive XZ-501A and a salt-resistant deformable amine-based polymer fluid loss additive XZ-501B at a weight ratio of 1: 1-3 at 1000 rpm-2000 rpm for 0.5 h-1.
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