CN113429948A - Low-friction water-based drilling fluid and preparation method thereof - Google Patents
Low-friction water-based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-friction water-based drilling fluid and a preparation method thereof, and relates to the technical field of oilfield chemistry. The invention provides a low-friction water-based drilling fluid which comprises the following preparation raw materials in parts by weight: water: 75-90 parts of a solvent; polyphosphate water solution: 10-25 parts; alkalinity regulator: 0.1-2.0 parts; fluid loss additive: 1.0-4.0 parts; rheology modifier: 0.1-0.6 part; anti-collapse plugging agent: 1.0-3.5 parts; inhibitor (B): 1.0-3.5 parts; barite: 0-100 parts. The low-friction water-based drilling fluid provided by the invention is prepared on the basis of a polyphosphate water solution with super-strong lubricity, and has lubricating performance comparable to that of an oil-based drilling fluid, and can solve the problems of friction and torque of extended reach wells and horizontal wells.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a low-friction water-based drilling fluid and a preparation method thereof.
Background
With the continuous deepening of oil and gas resource exploration and development and the requirements of cost reduction and efficiency improvement, the adoption of the large-displacement well and the horizontal well is one of the main well types of exploration and development at present, the horizontal displacement of the large-displacement horizontal well can be extended as far as possible in order to increase the oil extraction area and the oil extraction amount, but the maximum extension range of the large-displacement well is always limited by the problem of friction resistance and torque of a pipe column. Standby states that friction and torque are the core of the drilling engineering problem of large displacement wells in its published article, "Current State and trends in Large Displacement drilling technology".
The oil-based drilling fluid is a common drilling fluid system for complex well types such as extended reach wells, horizontal wells and the like, has excellent lubricating property, can effectively reduce the friction torque in the drilling process, has important significance on the horizontal extension of the extended reach wells and the horizontal wells, and also has better well wall stabilizing effect and rheological control capability. However, in the face of increasingly severe environmental protection, the application of the oil-based drilling fluid is increasingly limited, and the problem of friction resistance and torque of the water-based drilling fluid is one of the key factors for restricting the application of the water-based drilling fluid in extended reach wells and horizontal wells.
The Chinese invention patent CN103952128A introduces a weak gel solid-free water-based drilling fluid suitable for extended reach wells and horizontal wells, the system has higher low shear rate viscosity, the patent mainly evaluates the temperature resistance, the rheology and the filtration loss performance of the system, and evaluation data is not given to the lubricating performance of the drilling fluid system. The Chinese invention patent CN105754563A introduces an organic salt drilling fluid suitable for extended reach wells, the mud cake viscosity coefficient reduction rate reaches 66%, which is improved by 15% compared with 51% of the conventional organic salt system. However, the lubricating effect of the drilling fluid is slightly better than that of the common water-based drilling fluid only through simple evaluation of the lubricating performance of the drilling fluid, and the drilling fluid cannot be compared favorably with an oil-based drilling fluid, so that the problem that the horizontal extension distance is restricted when the water-based drilling fluid is applied to a large displacement well cannot be solved substantially.
The Chinese invention patent CN111793477A introduces a water-based drilling fluid, which is prepared by taking a modified surfactant as a base fluid, the lubricating property of the water-based drilling fluid is mainly characterized by the lubricating coefficient measured by an extreme pressure lubricator, the lowest lubricating coefficient is 0.059, and the wear resistance reaches 10 blocks. The extreme pressure lubricator reads a calculated value when 150 inches per pound force acts for 5min, the friction between a metal surface and a surface between a sliding block and a sliding ring is evaluated, in the actual drilling process, the friction between the metal point and the point, between the point and the surface, between the surface and between a mud cake and the metal can occur, the evaluation means of the lubricating effect of the drilling fluid is single, and the underground friction environment cannot be truly simulated.
Disclosure of Invention
The invention aims to provide a low-friction water-based drilling fluid and a preparation method thereof, the low-friction water-based drilling fluid provided by the invention has lubricating performance which is comparable to that of an oil-based drilling fluid, and can solve the problems of friction and torque of extended reach wells and horizontal wells.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a low-friction water-based drilling fluid which comprises the following preparation raw materials in parts by mass:
water: 75-90 parts of a solvent;
polyphosphate water solution: 10-25 parts;
alkalinity regulator: 0.1-2.0 parts;
fluid loss additive: 1.0-4.0 parts;
rheology modifier: 0.1-0.6 part;
anti-collapse plugging agent: 1.0-3.5 parts;
inhibitor (B): 1.0-3.5 parts;
barite: 0 to 100 parts.
Preferably, the mass concentration of the polyphosphate water solution is 23-41%.
Preferably, the polyphosphate in the polyphosphate water solution is ammonium polyphosphate.
Preferably, the alkalinity regulator comprises one or more of sodium hydroxide, sodium carbonate and potassium hydroxide.
Preferably, the fluid loss additive is a modified starch.
Preferably, the rheology modifier comprises one or more of xanthan gum, welan gum, locust bean gum, tamarind gum, konjac gum, fenugreek gum, guar gum and locust bean gum.
Preferably, the anti-collapse plugging agent comprises one or more of potassium humate, sulfonated lignite resin and sulfonated asphalt.
Preferably, the inhibitor is a polyamine.
Preferably, the particle size of the barite is 200-1000 meshes.
The invention provides a preparation method of the low-friction water-based drilling fluid in the technical scheme, which comprises the following steps:
mixing the prepared raw materials to obtain the low-friction water-based drilling fluid.
The invention provides a low-friction water-based drilling fluid which comprises the following preparation raw materials in parts by mass: water: 75-90 parts of a solvent; polyphosphate water solution: 10-25 parts; alkalinity regulator: 0.1-2.0 parts; fluid loss additive: 1.0-4.0 parts; rheology modifier: 0.1-0.6 part; anti-collapse plugging agent: 1.0-3.5 parts; inhibitor (B): 1.0-3.5 parts; barite: 0-100 parts. In the invention, the polyphosphate water solution generates a soluble complex with metal ions (the surface of a drilling tool) and is adsorbed on the metal surface to form a protective film, so that the metal can be completely isolated, and the aims of reducing friction and reducing friction resistance are fulfilled; the polyphosphate water solution realizes the conversion from dry friction and boundary friction to fluid friction, and can greatly reduce the friction resistance. The low-friction water-based drilling fluid provided by the invention is prepared on the basis of a polyphosphate water solution with super-strong lubricity, and has lubricating performance comparable to that of an oil-based drilling fluid, and can solve the problems of friction and torque of extended reach wells and horizontal wells.
The results of the examples show that the low-friction water-based drilling fluid provided by the invention can effectively reduce the friction torque of the drilling fluid, the extreme pressure friction coefficient is as low as 0.0623, which is close to 0.0560 of oil-based drilling fluid, and the low-friction water-based drilling fluid has better wear resistance than the oil-based drilling fluid; the four-ball friction coefficient is 0.0677, the wear scar is 0.662mm, the lubricating property is better than 0.0896 of the oil-based drilling fluid, and the four-ball friction coefficient has better wear resistance than the oil-based drilling fluid; the viscosity coefficient of the mud cake is as low as 0.0699.
In addition, the low-friction water-based drilling fluid provided by the invention has the application temperature range of 20-140 ℃, is wide in application temperature range, and is suitable for industrial popularization and application.
Drawings
FIG. 1 is a wear scar map for example 1;
FIG. 2 is a wear scar map for example 2;
FIG. 3 is a wear scar map for example 3;
FIG. 4 is a wear scar map for comparative example 1;
FIG. 5 is a wear scar map for comparative example 2;
FIG. 6 is a wear scar map for comparative example 3;
FIG. 7 is a comparison graph of the change curves of the friction coefficient with time of the drilling fluids of example 3 and comparative examples 1 to 3.
Detailed Description
The invention provides a low-friction water-based drilling fluid which comprises the following preparation raw materials in parts by mass:
water: 75-90 parts of a solvent;
polyphosphate water solution: 10-25 parts;
alkalinity regulator: 0.1-2.0 parts;
fluid loss additive: 1.0-4.0 parts;
rheology modifier: 0.1-0.6 part;
anti-collapse plugging agent: 1.0-3.5 parts;
inhibitor (B): 1.0-3.5 parts;
barite: 0 to 100 parts.
The preparation raw material of the low-friction water-based drilling fluid comprises, by mass, 75-90 parts of water, preferably 80-85 parts of water. In the present invention, the water is preferably fresh water.
The preparation raw materials of the low-friction water-based drilling fluid comprise, by weight, 10-25 parts of polyphosphate water solution, preferably 15-20 parts. In the present invention, the sum of the parts by mass of the water and the polyphosphate aqueous solution is preferably 100 parts.
In the invention, the mass concentration of the polyphosphate water solution is preferably 23-41%, and more preferably 28.6-37.5%. In the invention, the polyphosphate in the polyphosphate water solution is preferably ammonium polyphosphate, and more preferably one or more of ammonium phosphate, ammonium pyrophosphate, ammonium tripolyphosphate and ammonium tetrapolyphosphate.
In the invention, the ammonium polyphosphate is preferably prepared by a condensation method of phosphoric acid and urea.
In the present invention, the preparation method of the ammonium polyphosphate preferably comprises: and mixing phosphoric acid and urea, and carrying out condensation reaction to obtain the ammonium polyphosphate. In the invention, the mass ratio of the phosphoric acid to the urea is preferably 95: 60-130, and more preferably 95: 80-100. In the present invention, the temperature of the condensation reaction is preferably 180 ℃, and the time of the condensation reaction is preferably 60 min. According to the invention, preferably, after the condensation reaction, the obtained condensation product is sequentially dried, cooled and ground to obtain the ammonium polyphosphate.
In the present invention, the polyphosphate water solution is preferably formed by mixing polyphosphate and water.
The preparation raw materials of the low-friction water-based drilling fluid comprise 0.1-2.0 parts of alkalinity regulator, preferably 0.2-0.4 part of alkalinity regulator. In the present invention, the alkalinity regulator preferably includes one or more of sodium hydroxide, sodium carbonate and potassium hydroxide.
The preparation raw materials of the low-friction water-based drilling fluid comprise, by weight, 1.0-4.0 parts of a fluid loss additive, preferably 2.5-3.0 parts. In the present invention, the fluid loss additive is preferably a modified starch. Compared with natural starch, the modified starch adopted as the filtrate reducer introduces hydroxyl on molecular chain links, so that the water solubility, the tackifying capability and the antimicrobial effect capability of the filtrate reducer are obviously improved, and the filtrate reducer has strong salt resistance and calcium pollution resistance.
In the present invention, the preparation method of the modified starch preferably includes: mixing potato starch, cassava starch, corn starch, water caltrop starch, sodium hydroxide, ethylene oxide and water, injecting the obtained mixture into a screw extruder, controlling the temperature to be 110-120 ℃, extruding the starch from a screw extrusion port, then instantly puffing and drying, and then sequentially performing coarse crushing and fine grinding on the puffed starch to obtain the modified starch. In the invention, the mass ratio of the potato starch, the cassava starch, the corn starch, the water caltrop starch, the sodium hydroxide, the ethylene oxide and the water is preferably 10-30: 10-45: 10-45: 0-15: 1-3: 5-20: 120-180, more preferably 10-20: 15-35: 15-35: 10-15: 1-3: 10-12: 140 to 150. In the present invention, the water is preferably deionized water.
In the present invention, the mesh number of the modified starch is preferably 120 mesh.
The preparation raw materials of the low-friction water-based drilling fluid comprise 0.1-0.6 part by weight of the rheological regulator, preferably 0.2-0.3 part by weight of the water. In the present invention, the rheology modifier preferably includes one or more of xanthan gum, welan gum, locust bean gum, tamarind gum, konjac gum, fenugreek gum, guar gum, and locust bean gum, more preferably a mixture of xanthan gum, welan gum, locust bean gum, and guar gum. In the invention, when the rheology modifier is a mixture of xanthan gum, welan gum, locust bean gum and guar gum, the mass ratio of the xanthan gum, welan gum, locust bean gum and guar gum is preferably 20-60: 0 to 25: 10-40: 10 to 35, more preferably 30 to 40: 20-25: 20-30: 20 to 30. The rheological control agent has good temperature resistance, strong rheological control capability and good shearing dilutability.
The preparation raw materials of the low-friction water-based drilling fluid comprise, by weight, 1.0-3.5 parts of an anti-collapse plugging agent, and preferably 3.0-3.5 parts of water. In the present invention, the anti-collapse plugging agent preferably comprises one or more of potassium humate, sulfonated lignite resin and sulfonated asphalt, more preferably a mixture of potassium humate, sulfonated lignite resin and sulfonated asphalt. In the invention, when the anti-collapse plugging agent is a mixture of potassium humate, sulfonated lignite resin and sulfonated asphalt, the mass ratio of the potassium humate to the sulfonated lignite resin to the sulfonated asphalt is preferably 30-55: 20-50: 30-50, more preferably 35-50: 20-30: 30-40.
The preparation raw materials of the low-friction water-based drilling fluid comprise 1.0-3.5 parts by weight of inhibitor, preferably 2.0-3.0 parts by weight of water. In the present invention, the inhibitor is preferably a polyamine.
The preparation raw material of the low-friction water-based drilling fluid comprises 0-100 parts by weight of barite, preferably 90 parts by weight of water. In the invention, the particle size of the barite is preferably 200-1000 meshes, and more preferably 350 meshes.
The invention also provides a preparation method of the low-friction water-based drilling fluid in the technical scheme, which comprises the following steps: mixing the prepared raw materials to obtain the low-friction water-based drilling fluid. The present invention has no special requirement on the specific mixing process, and the mixing process known to those skilled in the art can be adopted.
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.
Example 1
Mixing 90 parts by mass of fresh water, 10 parts by mass of an ammonium polyphosphate aqueous solution, 0.2 part by mass of sodium hydroxide, 2.5 parts by mass of modified starch, 0.3 part by mass of a rheology modifier, 3.0 parts by mass of an anti-collapse plugging agent, 2.0 parts by mass of polyamine and 90 parts by mass of barite, and fully stirring to obtain the low-friction water-based drilling fluid.
The preparation method of the ammonium polyphosphate water solution comprises the following steps: putting 60 parts by mass of urea and 95 parts by mass of phosphoric acid into a flask, heating and stirring until foaming, reacting at 180 ℃ for 60min, drying, cooling and grinding to obtain the ammonium polyphosphate. And uniformly mixing 40 parts by mass of ammonium polyphosphate and 100 parts by mass of water to prepare an ammonium polyphosphate water solution.
The preparation method of the modified starch comprises the following steps: uniformly mixing 10 parts by weight of potato starch, 15 parts by weight of cassava starch, 35 parts by weight of corn starch, 15 parts by weight of water chestnut starch, 3 parts by weight of sodium hydroxide, 10 parts by weight of ethylene oxide and 150 parts by weight of deionized water, injecting the mixture into a screw extruder, controlling the temperature to be 115 ℃, extruding the starch from a screw extrusion port, instantly puffing and drying, coarsely crushing and finely grinding the puffed starch, and sieving the starch with a 120-mesh sieve to obtain the modified starch.
The rheology regulator is a mixture of xanthan gum, welan gum, locust bean gum and guar gum; the mass ratio of the xanthan gum to the welan gum to the locust bean gum to the guar gum is 20:20:30: 10.
The anti-collapse plugging agent is a mixture of potassium humate, sulfonated lignite resin and sulfonated asphalt; the mass ratio of the potassium humate to the sulfonated lignite resin to the sulfonated asphalt is 35:20: 30.
Example 2
Mixing 80 parts by mass of fresh water, 20 parts by mass of ammonium polyphosphate water solution, 0.3 part by mass of sodium hydroxide, 2.5 parts by mass of modified starch, 0.25 part by mass of rheological modifier, 3.0 parts by mass of anti-collapse plugging agent, 2.5 parts by mass of polyamine and 90 parts by mass of barite, and fully stirring to obtain the low-friction water-based drilling fluid.
The preparation method of the ammonium polyphosphate water solution comprises the following steps: putting 80 parts by mass of urea and 95 parts by mass of phosphoric acid into a flask, heating and stirring until foaming, reacting at 180 ℃ for 60min, drying, cooling and grinding to obtain the ammonium polyphosphate. And (2) uniformly mixing 50 parts by mass of ammonium polyphosphate and 100 parts by mass of water to prepare an ammonium polyphosphate water solution.
The preparation method of the modified starch comprises the following steps: uniformly mixing 20 parts by weight of potato starch, 35 parts by weight of cassava starch, 15 parts by weight of corn starch, 10 parts by weight of water chestnut starch, 1 part by weight of sodium hydroxide, 12 parts by weight of ethylene oxide and 140 parts by weight of deionized water, injecting the mixture into a screw extruder, controlling the temperature to be 115 ℃, extruding the starch from a screw extrusion port, instantly puffing and drying, coarsely crushing and finely grinding the puffed starch, and sieving the starch with a 120-mesh sieve to obtain the modified starch.
The rheology regulator is a mixture of xanthan gum, welan gum, locust bean gum and guar gum; the mass ratio of the xanthan gum to the welan gum to the locust bean gum to the guar gum is 30:20:40: 10.
The anti-collapse plugging agent is a mixture of potassium humate, sulfonated lignite resin and sulfonated asphalt; the mass ratio of the potassium humate to the sulfonated lignite resin to the sulfonated asphalt is 50:20: 40.
Example 3
Mixing 75 parts by mass of fresh water, 25 parts by mass of an ammonium polyphosphate aqueous solution, 0.4 part by mass of sodium hydroxide, 3.0 parts by mass of modified starch, 0.2 part by mass of a rheology modifier, 3.5 parts by mass of an anti-collapse plugging agent, 3.0 parts by mass of polyamine and 90 parts by mass of barite, and fully stirring to obtain the low-friction water-based drilling fluid.
The preparation method of the ammonium polyphosphate water solution comprises the following steps: 100 parts by mass of urea and 95 parts by mass of phosphoric acid are put into a flask and heated and stirred until foaming, the reaction is carried out for 60min at 180 ℃, and then the ammonium polyphosphate is obtained after drying, cooling and grinding. And uniformly mixing 60 parts by mass of ammonium polyphosphate with 100 parts by mass of water to prepare an ammonium polyphosphate water solution.
The preparation method of the modified starch comprises the following steps: uniformly mixing 10 parts by weight of potato starch, 45 parts by weight of cassava starch, 15 parts by weight of corn starch, 10 parts by weight of water chestnut starch, 1 part by weight of sodium hydroxide, 12 parts by weight of ethylene oxide and 140 parts by weight of deionized water, injecting the mixture into a screw extruder, controlling the temperature to be 115 ℃, extruding the starch from a screw extrusion port, instantly puffing and drying, coarsely crushing and finely grinding the puffed starch, and sieving the starch with a 120-mesh sieve to obtain the modified starch.
The rheology regulator is a mixture of xanthan gum, welan gum, locust bean gum and guar gum; the mass ratio of the xanthan gum to the welan gum to the locust bean gum to the guar gum is 40:20:20: 20.
The anti-collapse plugging agent is a mixture of potassium humate, sulfonated lignite resin and sulfonated asphalt; the mass ratio of the potassium humate to the sulfonated lignite resin to the sulfonated asphalt is 30:30: 50.
Comparative example 1
Oil-based drilling fluids: fully mixing 80 parts by mass of white oil, 20 parts by mass of saturated calcium chloride aqueous solution, 2.0 parts by mass of main emulsifier, 1.0 part by mass of auxiliary emulsifier, 0.8 part by mass of shear improver, 1.5 parts by mass of alkalinity regulator, 2.0 parts by mass of organic soil, 3.0 parts by mass of filtrate reducer, 3.0 parts by mass of plugging agent and 100 parts by mass of barite to obtain the oil-based drilling fluid.
Comparative example 2
Polymer potassium chloride drilling fluid: fully mixing 100 parts by mass of seawater, 3.0 parts by mass of bentonite, 0.2 part by mass of sodium carbonate, 0.4 part by mass of polyanionic cellulose, 0.5 part by mass of polyacrylamide, 5 parts by mass of potassium chloride, 1.5 parts by mass of hydroxypropyl starch, 1.0 part by mass of sulfonated asphalt, 1.5 parts by mass of sulfonated phenolic resin, 2.0 parts by mass of lubricant and 30 parts by mass of barite to obtain the polymer potassium chloride drilling fluid.
Comparative example 3
Example 6 in patent CN111793477A was taken as comparative example 3:
70 parts by mass of seawater, 30 parts by mass of multifunctional base fluid, 0.1 part by mass of sodium hydroxide, 0.25 part by mass of coating agent, 2.5 parts by mass of filtrate reducer, 0.15 part by mass of rheological regulator, 1.0 part by mass of anti-collapse plugging agent and 80 parts by mass of barite are mixed and fully stirred to obtain the water-based drilling fluid.
The mass ratio of the castor oil sodium phosphate, the maleic acid-acrylic acid copolymer, the polyethylene glycol monooleate and the water in the multifunctional base liquid is 40:65:15: 40. The mass ratio of the potato starch, the cassava starch, the canna edulis ker starch and the water caltrop starch in the filtrate reducer is 10:30:10: 25. The mass ratio of xanthan gum, tamarind gum, guar gum and locust bean gum in the rheology modifier is 55:20:10: 5. The mass ratio of potassium humate to natural resin in the anti-collapse plugging agent is 30: 20.
Test example 1
The drilling fluid performances of examples 1 to 3 and comparative examples 1 to 3 were tested to test the basic performance of the drilling fluid, and the friction coefficient was measured under 150 inch pound action using a FANN extreme pressure lubricator, and the results are shown in Table 1.
TABLE 1 basic Properties of drilling fluids of examples 1-3 and comparative examples 1-3
As can be seen from Table 1, examples 1 to 3 and comparative examples 1 to 3 all have better rheological and fluid loss properties and can meet the drilling requirements. The friction resistance coefficient tested by an extreme pressure lubricator shows that when the adding amount of the ammonium polyphosphate water solution is 25 parts by mass, the friction resistance coefficient is 0.0623 which is close to 0.0560 of oil base; the viscosity coefficient of the mud cake is 0.0699, which is obviously superior to that of comparative examples 1-3, and is reduced by 43% compared with polymer potassium chloride drilling fluid and is reduced by 27% compared with the water-based drilling fluid provided by comparative example 3.
Test example 2
Aiming at the lubricating property of the drilling fluid, a four-ball friction tester is further used indoors to evaluate the average friction coefficient of different systems within 30min under the loads of 147N, 392N and 784N, and the wear resistance of different drilling fluid systems is represented by the diameter of a steel ball grinding crack, and the result is shown in table 2 and figures 1-6.
TABLE 2 lubricating properties of the drilling fluids of examples 1-3 and comparative examples 1-3
As can be seen from Table 2, the friction coefficient of the system is gradually reduced with the increase of the proportion of the ammonium polyphosphate aqueous solution in the low-friction water-based drilling fluid system, and when the addition of the ammonium polyphosphate aqueous solution reaches 25 parts by mass, the average friction coefficient of the system under the load of 147N for 30min is 0.0677, which is obviously superior to 0.0896 of oil-based drilling fluid and 0.0941 of water-based drilling fluid of comparative example 3, and is obviously superior to the polymer drilling fluid system. With the increasing of the load, the friction resistance of the low-friction-resistance water-based drilling fluid is increased from 0.0677 to 0.0699, the friction resistance of the oil-based drilling fluid is increased from 0.0896 to 0.0953, the friction resistance coefficient of the comparative example 3 is increased from 0.0941 to 0.1184, and with the increasing of the load, the friction resistance coefficient is in an increasing trend, but the low-friction-resistance water-based drilling fluid is only slightly increased under the condition of high load and is only increased by 3 percent at most; the average friction coefficient of the oil-based drilling fluid and the comparative example 3 is obviously higher than that of an extreme pressure lubrication instrument within 30min, which shows that the low-friction water-based drilling fluid still has better wear resistance under the condition of long-time high load.
The wear marks generated by the figures 1-6 show that the lowest wear mark of the low-friction-resistance water-based drilling fluid is only 0.662mm, the wear mark of the oil-based drilling fluid reaches 0.845mm, and the wear mark of the comparative example 3 is 0.842mm, which shows that the wear resistance of the low-friction-resistance water-based drilling fluid is obviously superior to that of the oil-based drilling fluid.
Test example 3
To further evaluate the coefficient of friction versus time, the drilling fluids of example 3 and comparative examples 1-3 were evaluated for their coefficient of friction versus time under a 147N load, as shown in FIG. 7.
As can be seen from FIG. 7, the friction coefficient of the low-friction water-based drilling fluid prepared by the invention is almost unchanged under the load of 147N, while the friction coefficients of the oil-based drilling fluid and the water-based drilling fluid provided by the comparative example 3 are increased in an inflection point mode around 450s and 600s respectively, and the inflection point is caused by that the drilling fluid is damaged by forming abrasion on the metal surface, so that the low-friction water-based drilling fluid provided by the invention can better protect drilling tools under long-time friction conditions compared with the oil-based drilling fluid and the water-based drilling fluid of the comparative example 3.
The test results of the examples and the comparative examples show that the basic performance of the low-friction water-based drilling fluid provided by the invention can meet the requirements of extended reach wells and directional wells on the drilling fluid, and simultaneously has better lubricating performance which is comparable to that of oil-based drilling fluid, and the wear resistance of the low-friction water-based drilling fluid is better than that of the oil-based drilling fluid.
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 (10)
1. The low-friction water-based drilling fluid is characterized by comprising the following preparation raw materials in parts by mass:
water: 75-90 parts of a solvent;
polyphosphate water solution: 10-25 parts;
alkalinity regulator: 0.1-2.0 parts;
fluid loss additive: 1.0-4.0 parts;
rheology modifier: 0.1-0.6 part;
anti-collapse plugging agent: 1.0-3.5 parts;
inhibitor (B): 1.0-3.5 parts;
barite: 0 to 100 parts.
2. The low-friction water-based drilling fluid as claimed in claim 1, wherein the mass concentration of the polyphosphate water solution is 23-41%.
3. The low-friction water-based drilling fluid according to claim 1 or 2, wherein the polyphosphate in the polyphosphate water solution is ammonium polyphosphate.
4. The low friction, water-based drilling fluid of claim 1, wherein the alkalinity modifier comprises one or more of sodium hydroxide, sodium carbonate, and potassium hydroxide.
5. The low friction water-based drilling fluid according to claim 1, wherein the fluid loss additive is a modified starch.
6. The low friction water-based drilling fluid of claim 1, wherein the rheology modifier comprises one or more of xanthan gum, welan gum, locust bean gum, tamarind gum, konjac gum, fenugreek gum, guar gum, and locust bean gum.
7. The low friction water-based drilling fluid of claim 1, wherein the anti-sloughing blocking agent comprises one or more of potassium humate, sulfonated lignite resin and sulfonated asphalt.
8. The low friction water-based drilling fluid of claim 1, wherein the inhibitor is a polyamine.
9. The low-friction water-based drilling fluid as claimed in claim 1, wherein the barite has a particle size of 200-1000 meshes.
10. A method for preparing the low-friction water-based drilling fluid according to any one of claims 1 to 9, comprising the following steps:
mixing the prepared raw materials to obtain the low-friction water-based drilling fluid.
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