Ultra-deep well water-based drilling fluid with good pollution resistance as well as preparation method and device of ultra-deep well water-based drilling fluid

Abstract

The invention belongs to the field of drilling engineering, and particularly relates to ultra-deep well water-based drilling fluid with good anti-pollution performance and a preparation method and device thereof, and the ultra-deep well water-based drilling fluid comprises 850-950 parts of fresh water / low-salinity water, 30-80 parts of high-quality bentonite, 20-40 parts of sulfonated phenolic resin, 20-40 parts of sulfonated lignite, 5-25 parts of a polyamine solution, 70-110 parts of potassium chloride, 20-60 parts of sulfonated asphalt and 10-30 parts of a non-fluorescent lubricant. 5-15 parts of a sodium hydroxide solution and 1000-2000 parts of barite powder; the high temperature resistance and rheological property can be optimized, sulfonated phenolic resin (modified by sulfonated groups) and sulfonated lignite are compounded to form a cross-linked network, the temperature resistance limit is increased to 240 DEG C or above, the rheological parameter fluctuation after high-temperature aging is smaller than 15%, and compared with a traditional sulfonated asphalt system, the phenomenon that carbonization failure occurs easily at the temperature of 180 DEG C or above can be avoided; the viscosity is suddenly increased; and the well wall is unstable.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of drilling engineering, in particular to a super-deep well water-based drilling fluid with good anti-pollution performance and a preparation method and device. BACKGROUND

[0002] The water-based drilling fluid is a sol suspension system composed of bentonite, chemical treatment agent and weighting material, etc., with water as the continuous phase, which bears the core function in oil and gas drilling engineering, and the super-deep well water-based drilling fluid is a high-performance water-based drilling fluid system developed for super-deep complex strata with a well depth of ≥4500 meters and a bottom hole temperature of ≥180℃, and its core feature is to solve the problems of high-temperature rheological instability, well wall collapse and lubrication failure through high-temperature resistant treatment agent and reinforced formula design.

[0003] The components of the super-deep well water-based drilling fluid on the market will double attenuate in stability and anti-interference ability under high temperature and high pressure environment, the conventional polymer treatment agent (such as tackifier, fluid loss additive) will occur chain scission degradation or crosslinking solidification at a high temperature above 180℃, losing the ability of coating drill cuttings and controlling fluid loss, for example, the molecular weight of sulfonated treatment agent will attenuate by >40% at 200℃, which cannot effectively adsorb pollutants, at the same time, the emulsifier relied by oil-based drilling fluid will lose balance of HLB value at high temperature, mineral oil will be replaced by formation brine, forming free water phase to intensify clay hydration, since the anti-pollution performance is poor, pollutants (such as calcium and magnesium ions, drill cuttings) will invade to compress the double electric layer of clay particles, weakening the inhibition of the treatment agent, leading to intensified shale hydration and swelling, inducing well wall peeling or collapse, and the filtration loss of high-density drilling fluid will be out of control (API filtration loss >30mL) after being polluted, the loose filter cake cannot effectively plug the formation microcracks, which is easy to cause fracturing leakage.

[0004] Therefore, the application provides a super-deep well water-based drilling fluid with good anti-pollution performance and a preparation method and device. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0006] The technical scheme adopted by the application to solve the technical problems is that the application provides a super-deep well water-based drilling fluid with good anti-pollution performance and a preparation method and device, which comprises the following raw materials in parts by weight:

[0007]

[0008] A preparation method of a super-deep well water-based drilling fluid, which is used for the super-deep well water-based drilling fluid with good anti-pollution performance, and characterized in that the method comprises the following steps:

[0009] S1: 850-950 L of pretreated fresh water with conductivity ≤ 50 μS / cm is injected into the stirring tank, the motor is started to make the stirring cylinder stir at low speed, and the bentonite 30-80 kg is added in batches from the feeding pipe by using a negative pressure feeding system, the feeding rate is controlled to be ≤ 5 kg / 2 min, and the hydration is ensured to be sufficient without lumps under the shearing force of the cutting sleeve;

[0010] S2: 5-15 kg of sodium hydroxide solution is pre-dissolved in 10 times the volume of softened water, injected by a metering pump at a rate of 5 L / min, and the pH value is monitored in real time to be in the interval of 8.5-9.5;

[0011] S3: Sulfonated phenolic resin and sulfonated lignite are synchronously added by using a double-screw feeder, and the filtration loss is detected, then potassium chloride is added in three equal parts, and then the polyamine solution is injected;

[0012] S4: The sulfonated asphalt 20-60 kg is filtered by a screen cylinder, and the effect of adding the fluorescent lubricant 10-30 kg is verified by a lubrication coefficient tester, the target friction reduction amplitude is ≥ 35%, after using a roller furnace to heat roll for 16 hours at 240℃±2℃, the HTHP filtration loss rate change is tested according to GB / T16783.1;

[0013] S5: Barite powder 1000-2000 kg is added at a rate of 50±2 kg / min by using a loss weight feeding system, and the target density ±0.05 g / cm 3 Tolerance band;

[0014] S6: Quality acceptance is carried out, and whether the technical indexes of performance parameters such as apparent viscosity, dynamic shear force and lubrication coefficient meet the standards is detected.

[0015] The detailed steps of S3 are as follows:

[0016] S3a: Sulfonated phenolic resin 40-80 kg with sulfonation degree ≥ 60% and sulfonated lignite 40-80 kg with humic acid content ≥ 85% are synchronously added by using a double-screw feeder, the shearing stirring is maintained at 600 rpm for 60±5 minutes, the polymer molecular chain is fully stretched, and the Ubbelohde viscometer is used to detect the intrinsic viscosity ≥ 1.2 dL / g;

[0017] S3b: The filtration loss 7 MPa / 30 min is detected according to API 13B-1 standard, when it exceeds 15 mL, the sulfonated lignite is added, and the addition amount = the over-standard value × 1.2 kg / ml;

[0018] S3c: Potassium chloride 70-110 kg, industrial grade ≥99%, is added in three equal parts with an interval of 15 minutes, the conductivity meter is monitored on-line, the fluctuation is less than 5%, polyamine solution 10-25 kg, amine value ≥6.5 mmol / g, after injection, aging for 30 minutes, according to SY / T 6335 standard, the mudstone recovery rate is required to be greater than or equal to 85% in 16 hours.

[0019] The preparation device of the ultra-deep well water-based drilling fluid is applied to the preparation method of the ultra-deep well water-based drilling fluid, the stirring tank in step S1 comprises a body, feed pipes are fixedly connected to both sides of the outer periphery of the body, a discharge pipe is fixedly connected to the middle position of the bottom of the body, a rotating cylinder is rotatably connected to the middle position of the body, a motor is fixed to one end of the top of the body, first circular gears are fixedly sleeved with each other on the output end of the motor and the outer periphery of the rotating cylinder extending out of the body.

[0020] Preferably, a rotating rod is rotatably connected to the inner cavity of the rotating cylinder, two second circular gears are arranged on the top of the rotating cylinder, a fixed shaft is fixedly penetrated through the middle position of one of the rotating shafts, the bottom of the fixed shaft is fixed to the surface of the top of the body, and the other second circular gear is fixed to the outer periphery of the rotating rod extending out of the rotating cylinder.

[0021] Preferably, an insertion shaft is slidingly inserted at the position of the rotating shaft extending out of the stirring cylinder, a brush seat is fixed to the side of the insertion shaft away from the rotating shaft, a bolt is threadedly connected to the outer periphery of the rotating shaft, and an opening is fixedly sleeved at the position of the rotating cylinder in the inner cavity of the body.

[0022] Preferably, a sieve cylinder is arranged on the side of the top of the body away from the fixed shaft, a connecting pipe is fixedly connected to the bottom of the sieve cylinder, an opening is arranged at the position of the top of the body at the bottom of the sieve cylinder, the opening is in communication with the inner cavity of the body, and the connecting pipe is in slidingly inserted connection with the inner cavity of the opening.

[0023] Preferably, a contact block is fixed to one side of the outer periphery of the sieve cylinder, a cam is fixedly sleeved at the position of the outer periphery of the rotating cylinder close to the contact block, two fixed blocks are fixed to the positions of the top of the body at both ends of the sieve cylinder, a supporting shaft is fixed to the middle positions of the two fixed blocks, and a limiting sleeve is slidingly sleeved to the outer periphery of the supporting shaft.

[0024] Preferably, springs are sleeved to the outer periphery of the supporting shaft at the positions of both sides of the limiting sleeve, one side of the spring is fixed to the surface of the limiting sleeve at the adjacent position, and the other side of the spring is fixed to the surface of the fixed block at the adjacent position.

[0025] The beneficial effects of the present application are as follows:

[0026] 1. Anti-high temperature and rheological property optimization: sulfonated phenolic resin (sulfonated group modification) and sulfonated lignite are compounded to form a crosslinked network, the temperature limit is improved to above 240℃, the rheological parameter fluctuation is less than 15% after high temperature aging, compared with the traditional sulfonated asphalt system, the carbonization failure above 180℃ can be avoided, the viscosity increases sharply and the wellbore instability occurs, the high-quality bentonite is combined with polyamine solution as an inhibitor, the low solid phase (MBT≤35g / L) is maintained, the plastic viscosity is stable (45-60mPa·s) under high temperature and high pressure, the friction is reduced by 30%, and the deep drilling efficiency is significantly improved;

[0027] 2. Wellbore stability and leakage prevention capacity upgrading: polyamine solution and potassium chloride synergistic effect (external water invasion prevention + internal expansion control mechanism), the inhibition efficiency of shale hydration and expansion is improved by 50%, combined with sulfonated asphalt to form a dense sealing layer, the crack pressure capacity is >18MPa, solving the problem of easy leakage of traditional calcium-based bentonite system in fractured formation, sulfonated asphalt replaces conventional walnut shell material (avoiding carbonization failure at 180℃), and the elastic modulus is enhanced by silicone crosslinking, maintaining efficient plugging under 130MPa high pressure difference, and the leakage accident rate is reduced by 80%;

[0028] 3. Environmental protection and operation efficiency breakthrough: non-fluorescent lubricant (biodegradable) and zinc-free formula (Zn 2 +<5mg / L) are combined, the rock debris biological toxicity EC50 value is >30000mg / L, the environmental protection treatment cost is only 25% of the oil-based drilling fluid, the emission standard in sensitive areas is met, the low solid phase design is combined with non-fluorescent lubricant, the lubrication coefficient is reduced to 0.08-0.10, the mechanical drilling speed in shale formation is increased by 6.6% compared with the traditional water-based system, and the barite powder step grading technology reduces the amount of weighting material by 20%, and the comprehensive cost is saved by more than 30%. BRIEF DESCRIPTION OF DRAWINGS

[0029] The application will be further described below with reference to the drawings.

[0030] Figure 1 is the preparation method flow chart in the application;

[0031] Figure 2 is the specific method flow chart of S3 in the application;

[0032] Figure 3 is the perspective structural schematic diagram of the stirring tank in the application;

[0033] Figure 4 is the perspective structural schematic diagram of the stirring tank in the application Figure 3 is the structural enlarged schematic diagram of A in the application;

[0034] Figure 5 is the perspective structural sectional schematic diagram of the stirring tank in the application;

[0035] Figure 6 is a structure amplification schematic diagram in the present application Figure 5 is a structure amplification schematic diagram in the present application

[0036] Figure 7 is a structure amplification schematic diagram in the present application Figure 5 is a structure amplification schematic diagram in the present application

[0037] Figure 8 is a structure amplification schematic diagram in the present application

[0038] In the figure: 1, body; 2, feed pipe; 3, discharge pipe; 4, rotating cylinder; 5, motor; 6, rotating rod; 7, stirring cylinder; 8, first bevel gear; 9, rotating shaft; 10, second bevel gear; 11, rotating rod; 12, third bevel gear; 13, cutting sleeve; 14, shaft; 15, brush holder; 16, bolt; 17, first circular gear; 18, fixed shaft; 19, second circular gear; 20, cam; 21, screen cylinder; 22, abutting block; 23, fixed block; 24, support shaft; 25, limiting sleeve; 26, spring; 27, opening; 28, connecting pipe; 29, scraper. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0040] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0041] The technical scheme adopted by the present application to solve its technical problems is: an ultra-deep well water-based drilling fluid with good anti-pollution performance, characterized in that the ultra-deep well water-based drilling fluid is composed of the following raw materials by weight:

[0042]

[0043] The ultra-deep well water-based drilling fluid in the present application has the following effects:

[0044] 1. High-temperature resistance and rheological property optimization: sulfonated phenolic resin (sulfonated group modification) and sulfonated lignite are compounded to form a crosslinked network, the temperature resistance limit is improved to above 240 DEG C, the rheological parameter fluctuation after high-temperature aging is less than 15%, compared with the traditional sulfonated asphalt system, the carbonization failure above 180 DEG C can be avoided, the viscosity is increased sharply and the wellbore instability occurs, high-quality bentonite (particle size above 200 mesh) is used in combination with polyamine solution as an inhibitor to maintain a low solid phase (MBT≤35 g / L), ensure the stability of plastic viscosity (45-60 mPa·s) under high temperature and high pressure, reduce the friction by 30%, and significantly improve the deep drilling efficiency;

[0045] 2. Upgraded wellbore stability and leak prevention / plugging capabilities: The synergistic effect of polyamine solution and potassium chloride (external waterproofing + internal expansion control mechanism) increases the efficiency of shale hydration expansion inhibition by 50%. Combined with sulfonated asphalt, it forms a tight sealing layer with a fracture pressure resistance of >18MPa, solving the problem of easy leakage in fractured formations of traditional calcium-based bentonite systems. Sulfonated asphalt replaces conventional walnut shell materials (avoiding carbonization failure at 180℃). The elastic modulus is enhanced by organosilicon crosslinking, maintaining efficient leak plugging under a high pressure difference of 130MPa, reducing the leakage accident rate by 80%.

[0046] 3. Breakthroughs in environmental protection and operational efficiency: Fluorescent-free lubricant (biodegradable) and zinc-free formula (Zn) 2 The combination of +<5mg / L results in a cuttings biotoxicity EC50 value >30000mg / L, with environmental treatment costs only 25% of oil-based drilling fluids, meeting emission standards for sensitive areas. The low-solids design, combined with a non-fluorescent lubricant, reduces the lubrication coefficient to 0.08–0.10, increasing the mechanical drilling rate in shale formations by 6.6% compared to traditional water-based systems. Meanwhile, the barite powder stepped gradation technology reduces the amount of weighting materials used by 20%, resulting in overall cost savings of over 30%.

[0047] like Figures 1 to 2 As shown, a process for preparing an ultra-deep well water-based drilling fluid is described. This process is used to prepare the aforementioned ultra-deep well water-based drilling fluid with good anti-fouling properties. The process includes the following steps:

[0048] S1: Inject 850-950L of pretreated fresh water into the mixing tank. The conductivity should be ≤50μS / cm. Start motor 5 to make the mixing drum stir at low speed. Use negative pressure feeding system to add 30-80kg of bentonite in batches from feed pipe 2. Control the feeding rate to ≤5kg / 2min. Under the shearing force of cutting sleeve 13, avoid hydration and ensure that there are no lumps.

[0049] S2: Pre-dissolve 5-15 kg of sodium hydroxide solution in 10 times its volume of softened water, and inject it through a metering pump at a rate of 5 L / min, while monitoring the pH value in real time until it reaches the range of 8.5-9.5;

[0050] S3: Sulfonated phenolic resin and sulfonated lignite are simultaneously fed using a twin-screw feeder and the filtration loss is detected. Then potassium chloride is added in three equal parts in a gradient, followed by the injection of polyamine solution.

[0051] S4: Filter 20-60 kg of sulfonated asphalt through sieve cylinder 21, and verify the effect of adding 10-30 kg of non-fluorescent lubricant by using a lubrication coefficient tester. The target friction reduction is ≥35%. After hot rolling in a roller furnace at 240℃±2℃ for 16 hours, test the HTHP filtration loss change rate according to GB / T16783.1.

[0052] S5: Adopting the weight loss type feeding system to add the barite powder 0-2000kg at the speed of 50±2kg / min

[0053] Every 200kg of cumulative filling is detected by the pressurized density meter, and adjusted to the target density ±0.05g / cm 3 Tolerance band;

[0054] S6: Carrying out quality acceptance, detecting whether the technical indexes of performance parameters such as apparent viscosity, dynamic shear force and lubrication coefficient meet the standards.

[0055] The detailed steps of S3 are as follows:

[0056] S3a: Adopting the double-screw feeder to synchronously add the sulfonated phenolic aldehyde resin 40-80kg, the sulfonation degree ≥60% and the sulfonated lignite 40-80kg, the humic acid content ≥85%, maintaining the shear stirring 600rpm for 60±5 minutes, so that the polymer molecular chain is fully stretched, and the intrinsic viscosity is detected by the Ubbelohde viscometer ≥1.2dL / g;

[0057] S3b: Detecting the filtration loss 7MPa / 30min according to the API 13B-1 standard, when the filtration loss exceeds 15ml, the sulfonated lignite is added, and the added amount is equal to the over-standard value ×1.2kg / ml;

[0058] S3c: The potassium chloride 70-110kg, the industrial grade ≥99% is added in three equal parts in gradient, the interval is 15 minutes / batch, the conductivity meter is monitored on line, the fluctuation is less than 5%, the polyamine solution 10-25kg, the amine value ≥6.5mmol / g is injected, and then the mudstone recovery rate is tested according to the SY / T 6335 standard, and the 16h recovery rate is required to be ≥85%.

[0059] Example one

[0060] As shown in Figures 3 to 8 The stirring tank of the embodiment of the application comprises a body 1, two sides of the outer periphery of the body 1 are communicated and fixed with feeding pipes 2, the middle position of the bottom of the body 1 is communicated and fixed with a discharging pipe 3, the middle position of the body 1 is rotationally connected with a rotating cylinder 4, one end of the top of the body 1 is fixed with a motor 5, the two sides of the rotating cylinder 4 are communicated and fixed with stirring cylinders 7, the output end of the motor 5 and the outer periphery of the rotating cylinder 4 extending out of the body 1 are fixed with first circular gears 17 meshing with each other, the negative pressure feeding system is communicated and fixed with one of the feeding pipes 2, so that fresh water and bentonite can be added to the inside of the body 1 through the feeding pipe 2, the motor 5 is started, the rotating cylinder 4 is driven to rotate under the meshing effect of the two first circular gears 17, so that a plurality of stirring cylinders 7 can make circular motion in the inner cavity of the body 1, so that the fresh water and bentonite entering the inside of the body 1 are fully stirred and mixed.

[0061] The inner cavity of the rotating cylinder 4 is rotationally connected with a rotating rod 6. The top of the rotating cylinder 4 is provided with two second circular gears 19. One of the two second circular gears 19 is fixed with a fixed shaft 18 at the middle position of the rotating shaft 9. The bottom of the fixed shaft 18 is fixed with the surface of the top of the body 1. The other second circular gear 19 is fixed with the outer circumferential surface of the rotating rod 6 extending out of the rotating cylinder 4. The rotating cylinder 4 is rotated by starting the motor 5, so that the rotating rod 6 is rotated, and the rotating rod 6 is rotated relative to the rotating cylinder 4 under the meshing action between the two second circular gears 19.

[0062] The middle position of the stirring cylinder 7 is rotationally connected with a rotating shaft 9. The outer circumferential surface of the rotating rod 6 is fixed with a plurality of first bevel gears 8 at the position of the inner cavity of the rotating cylinder 4. A plurality of second bevel gears 10 are fixedly sleeved on the outer circumferential surface of the rotating shaft 9. A plurality of rotating rods 11 are rotationally connected with the stirring cylinder 7 at the upper and lower ends. The outer circumferential surface of the rotating rod 11 is fixedly sleeved with a third bevel gear 12 at the position of the inner cavity of the stirring cylinder 7 at the adjacent position. The first bevel gear 8 and the second bevel gear 10 at the adjacent position are in meshing connection. The remaining second bevel gears 10 and the two adjacent third bevel gears 12 are in meshing connection. A plurality of cutting sleeves 13 are fixedly sleeved on the rotating rod 11 extending out of the stirring cylinder 7.

[0063] In the preparation process, bentonite clumps or high-temperature thickening material solidification may be stuck in the stirring cylinder 7. Foreign matter such as parts falling off the solid control equipment enters the tank, so when the rotating cylinder 4 and the stirring cylinder 7 rotate, the rotating rod 6 rotates relative to the rotating cylinder 4 under the meshing action between the two second circular gears 19, so that the first bevel gear 8 rotates, so that the rotating shaft 9 synchronously rotates under the meshing action between the first bevel gear 8 and the plurality of second bevel gears 10, and the cutting sleeve 13 synchronously rotates under the meshing action between the remaining second bevel gears 10 and the two adjacent third bevel gears 12, so that the rotating rod 11 drives the cutting sleeve 13 to rotate under the circumferential motion of the cutting sleeve 13 with the middle position of the rotating cylinder 4 as the center, so that the cutting sleeve 13 rotates under the shearing force of the cutting sleeve 13, thereby avoiding the situation that bentonite clumps or high-temperature thickening material solidification is stuck in the stirring cylinder 7, thereby effectively ensuring the preparation process of the ultra-deep well water-based drilling fluid.

[0064] The rotating shaft 9 extends out of the position of the stirring barrel 7 outside the sliding plug shaft 14, the plug shaft 14 is fixed with the brush seat 15 away from the rotating shaft 9, the outer periphery of the rotating shaft 9 is screwed with the bolt 16, the rotating cylinder 4 is fixedly sleeved with the opening 27 at the position of the bottom of the inner cavity of the body 1, by extending the plug shaft 14 to the inner cavity of the rotating shaft 9, and the brush seat 15 can be tightly fitted to the inner periphery of the body 1, rotating the bolt 16 makes the bolt 16 extend to the pre-set threaded hole of the outer periphery of the plug shaft 14 through the cooperation with the threaded structure of the inner wall of the rotating shaft 9, so that the plug shaft 14 and the brush seat 15 can be fixed, when the rotating shaft 9 does the circular motion, the stirring barrel 7 can do the circular motion with it, and self-rotation under the driving of the rotating shaft 9, so that the brush seat 15 can rub and clean the residues attached to the inner periphery of the body 1 after the preparation of the ultra-deep well water-based drilling fluid, and the rotation of the rotating cylinder 4 drives the scraper 29 to rotate, so that under the friction of the scraper 29 and the bottom position of the inner cavity of the body 1, the residues are prevented from being attached to the bottom of the inner cavity of the body 1, the separated residues can be discharged from the discharge pipe 3 by injecting clean water into the inner cavity of the body 1, the plug shaft 14 and the brush seat 15 can be replaced and the fitting place of the scraper 29 and the inner cavity surface of the body 1 can be cleaned by opening the sealing door on the surface of the body 1, so as to ensure the cleaning effect after long-term use.

[0065] Example two

[0066] As Figures 3 to 8 shown, the other embodiment of the present application is:

[0067] The top of the body 1 is provided with a screen cylinder 21 away from the fixed shaft 18 on the side of the rotating cylinder 4, the bottom of the screen cylinder 21 is communicated and fixed with a connecting pipe 28, the top of the body 1 is provided with an opening 27 at the position of the bottom of the screen cylinder 21, the opening 27 is communicated with the inner cavity of the body 1, the connecting pipe 28 is connected with the inner cavity of the opening 27 in a sliding plug manner, the outer periphery of the screen cylinder 21 is fixed with a contact block 22 on one side, the outer periphery of the rotating cylinder 4 is fixedly sleeved with a cam 20 close to the contact block 22, the top of the body 1 is fixed with two fixed blocks 23 at the positions of both ends of the screen cylinder 21, the middle positions of the two fixed blocks 23 are fixed with a support shaft 24, the outer periphery of the support shaft 24 is slidingly sleeved with a limiting sleeve 25, the outer periphery of the support shaft 24 is sleeved with a spring 26 at the positions of both sides of the limiting sleeve 25, one side of the spring 26 is fixed with the surface of the limiting sleeve 25 at the adjacent position, the other side of the spring 26 is fixed with the surface of the fixed block 23 at the adjacent position;

[0068] When the sulfonated asphalt needs to be added into the inner cavity of the main body 1, first, the motor 5 is closed and the sulfonated asphalt is added into the inside of the screen cylinder 21 to be stacked on the screen fixed in the inner cavity of the screen cylinder 21, and the top of the screen cylinder 21 is sealed by the sealing cover, the motor 5 is started to drive the rotating cylinder 4 to rotate, so that the cam 20 can slide the screen cylinder 21 in the horizontal direction under the abutting action of the abutting block 22 and the limiting action of the supporting shaft 24 and the limiting sleeve 25 on the screen cylinder 21, and when the cam 20 abuts against the abutting block 22 to make the screen cylinder 21 slide in the horizontal direction, the plurality of springs 26 can be deformed, so that the screen cylinder 21 can be reset under the elastic force of the springs 26 when the cam 20 moves away from the abutting block 22, so that the screen cylinder 21 can make reciprocating motion in the horizontal direction intermittently, so that the sulfonated asphalt entering the inside of the screen cylinder 21 is subjected to the force exerted by the movement track of the screen cylinder 21, so that the screen cylinder 21 is screened, so that the sulfonated asphalt meeting the requirements can pass through the screen and the connecting pipe 28 into the inner cavity of the main body 1.

[0069] The above-mentioned front, rear, left, right, up and down are based on the drawings of the specification Figure 1 as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0070] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A water-based drilling fluid for ultra-deep wells with good anti-pollution properties, characterized in that: The super-deep well water-based drilling fluid is composed of the following raw materials by weight; 2. A method for preparing a water-based drilling fluid for an ultra-deep well, which is used for preparing the water-based drilling fluid for an ultra-deep well having a good anti-pollution property as described in claim 1, characterized by: The method comprises the following steps: S1: 850-950L of pretreated fresh water with conductivity ≤50μS / cm is injected into the stirring tank, the motor (5) is started to make the stirring cylinder stir at low speed, the bentonite 30-80kg is added from the feeding pipe (2) in batches by using the negative pressure feeding system, the feeding rate is controlled to be ≤5kg / 2min, and the hydration is ensured to be sufficient without lumps under the shearing force of the cutting sleeve (13); S2: 5-15kg of sodium hydroxide solution is pre-dissolved in 10 times volume of softened water, is injected by the metering pump at a rate of 5L / min, and the pH value is monitored in real time to be in the interval of 8.5-9.5; S3: the sulfonated phenolic resin and the sulfonated lignite are synchronously added by using the double-spiral feeder, the filtration loss is detected, then the potassium chloride is added in three equal parts, and then the polyamine solution is injected; S4: the sulfonated asphalt 20-60kg is filtered by the screen cylinder (21), and the effect of adding the non-fluorescent lubricant 10-30kg is verified by the lubrication coefficient tester, the target friction reduction amplitude is ≥35%, after the roller furnace is used for hot rolling at 240℃±2℃ for 16 hours, the HTHP filtration loss change rate is tested according to GB / T16783.1; S5: Adopting the loss weight feeding system to add the barite powder 1000-2000kg at the speed of 50±2kg / min, and detect with the pressure densimeter every 200kg, and adjust to the target density±0.05g / cm 3 Tolerance band; S6: quality acceptance is carried out, and whether the technical indexes of apparent viscosity, dynamic shear force and lubrication coefficient performance parameters meet the standards is detected.

3. The method of claim 2, wherein the method further comprises: The detailed steps of S3 are as follows: S3a: the sulfonated phenolic resin 40-80kg with a sulfonation degree ≥60% and the sulfonated lignite 40-80kg with a humic acid content ≥85% are synchronously added by using the double-spiral feeder, the polymer molecular chain is fully stretched under the shearing stirring of 600rpm for 60±5min, and the intrinsic viscosity ≥1.2dL / g is detected by using the Ubbelohde viscometer; S3b: the filtration loss is detected according to the API 13B-1 standard, when the filtration loss exceeds 15ml, the sulfonated lignite is added, and the added amount = the over-standard value ×1.2kg / ml; S3c: the potassium chloride 70-110kg with an industrial grade ≥99% is added in three equal parts, the interval is 15min / batch, the conductivity meter is used for on-line monitoring, the fluctuation is <5%, the polyamine solution 10-25kg with an amine value ≥6.5mmol / g is injected, and then the mudstone recovery rate is tested according to the SY / T6335 standard, and the 16h recovery rate ≥85% is required.

4. A device for preparing a super-deep well water-based drilling fluid, which is applied to the method for preparing a super-deep well water-based drilling fluid according to claim 2, characterized in that: The stirring tank in step S1 comprises a body (1), feed pipes (2) are fixedly connected to the two sides of the outer periphery of the body (1), a discharge pipe (3) is fixedly connected to the middle position of the bottom of the body (1), a rotating cylinder (4) is rotatably connected to the middle position of the body (1), a motor (5) is fixed to one end of the top of the body (1), stirring cylinders (7) are fixedly connected to the two sides of the rotating cylinder (4), and first circular gears (17) that are intermeshed are fixedly connected to the output end of the motor (5) and the outer periphery of the rotating cylinder (4) extending out of the body (1).

5. The apparatus according to claim 4, wherein the apparatus is characterized by: The inner cavity of the rotating cylinder (4) is rotationally connected with a rotating rod (6), the top of the rotating cylinder (4) is provided with two second circular gears (19), one of the rotating shafts (9) is fixedly penetrated with a fixed shaft (18) at the middle position, the bottom of the fixed shaft (18) is fixed with the surface of the top of the body (1), and the other second circular gear (19) is fixed with the outer circumferential surface of the rotating rod (6) extending out of the rotating cylinder (4).

6. The apparatus according to claim 5, wherein the apparatus is characterized by: The position of the rotating shaft (9) extending out of the stirring cylinder (7) is slidingly inserted with a plug shaft (14), the side of the plug shaft (14) away from the rotating shaft (9) is fixed with a brush seat (15), the outer circumferential surface of the rotating shaft (9) is threadedly connected with a bolt (16), and the rotating cylinder (4) is fixedly sleeved with an opening (27) at the position of the bottom of the inner cavity of the body (1).

7. The device for preparing a water-based drilling fluid for ultra-deep wells according to claim 6, characterized in that: The top of the body (1) is provided with a screen cylinder (21) on the side away from the fixed shaft (18) of the rotating cylinder (4), the bottom of the screen cylinder (21) is fixedly communicated with a connecting pipe (28), the top of the body (1) is provided with an opening (27) at the position of the bottom of the screen cylinder (21), the opening (27) is communicated with the inner cavity of the body (1), and the connecting pipe (28) is slidingly and insertedly connected with the inner cavity of the opening (27).

8. The device for preparing a water-based drilling fluid for ultra-deep wells according to claim 7, characterized in that: The outer circumferential surface of the screen cylinder (21) is fixed with a contact block (22) on one side, the outer circumferential surface of the rotating cylinder (4) is fixedly sleeved with a cam (20) at the position close to the contact block (22), the top of the body (1) is fixed with two fixed blocks (23) at the positions of both ends of the screen cylinder (21), the middle positions of the two fixed blocks (23) are fixed with a supporting shaft (24), and the outer circumferential surface of the supporting shaft (24) is slidingly sleeved with a limiting sleeve (25).

9. The apparatus according to claim 8, wherein the apparatus is characterized by: The outer circumferential surface of the supporting shaft (24) is sleeved with a spring (26) at the positions on both sides of the limiting sleeve (25), one side of the spring (26) is fixed with the surface of the limiting sleeve (25) at the adjacent position, and the other side of the spring (26) is fixed with the surface of the fixed block (23) at the adjacent position.

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