Treating agent and system for recovering performance of recoverable drilling fluid

Abstract

The invention relates to a treating agent and system for recovering the performance of a recoverable drilling fluid. The treating agent comprises an activating agent for recovering the performance of the recoverable drilling fluid, a modifying agent for recovering the performance of the recoverable drilling fluid and a stabilizing agent for recovering the performance of the recoverable drilling fluid. The system comprises a mixer, the mixer is communicated with a liquid inlet pipe capable of recycling drilling fluid, the liquid inlet pipe is respectively communicated with an activator solution storage device, a modifier solution storage device and a stabilizer solution storage device through pipelines, and a stirring device is arranged in the mixer. The activating agent, the modifying agent and the stabilizing agent are mixed into the recyclable drilling fluid to be treated to be uniformly stirred, and the mixer adopts a stirring device which rotates in the inner direction and the outer direction, so that the mixing efficiency of the activating agent, the modifying agent, the stabilizing agent and the recyclable drilling fluid is effectively improved. According to the method, the treatment effect is good, the high-value drilling fluid can be repeatedly used, the treatment cost of the recyclable drilling fluid is reduced, the treatment efficiency is improved, and the performance of the recyclable drilling fluid is rapidly recovered.

Description

Technical Field

[0001] The invention relates to a drilling fluid treating agent, in particular to a treating agent for recovering the performance of recoverable drilling fluid. The invention also relates to a treating system for recovering the performance of recoverable drilling fluid, and belongs to the field of reusing recoverable drilling fluid. Background Art

[0002] Drilling fluid is an auxiliary liquid that must be used in the current oil drilling process. It can remove the debris generated by hydraulic rock crushing during the downhole drilling process. It also has the functions of bearing part of the gravity of the drill pipe and casing, cooling and lubricating the drill string, maintaining the stability of the wellbore, increasing the thickness of the hydration film of clay particles in the drilling fluid, and reducing the filtration loss. The current drilling fluid cannot be effectively recycled and reused. It is usually used as waste drilling fluid for solid-liquid separation through squeezing, and then the separated solid waste and waste liquid are treated separately, resulting in high later disposal costs of drilling fluid and certain environmental risks, which also affects the high cost of oil and gas production. Studies have shown that most of the waste drilling fluid still has the value of recycling and reuse. Through repeated use, the total amount of drilling fluid can be reduced, and the comprehensive drilling cost and environmental risk can be reduced. At present, the mixed dissolution efficiency is low when processing recyclable drilling fluid and adding powdered preparations, which affects the processing efficiency.

[0003] Related patent literature: CN103556967A discloses a waste drilling fluid treatment device, which includes a collection and separation system, a waste drilling fluid regeneration treatment system, a cuttings (solid waste) treatment system and a drilling fluid maintenance system. Among them, the collection and separation system collects the waste drilling fluid from the solid control circulation device of the drilling platform while drilling and separates it into solid and liquid components. The liquid phase of the collection and separation system is sent to the regeneration treatment system for treatment through the first transmission system, and then transported to the drilling fluid maintenance system for on-site recycling; the solid phase of the collection and separation system is sent to the cuttings treatment system through the second transmission system, and then it is processed for resource utilization. In this way, both the liquid and solid wastes generated by drilling can be recycled, thereby improving resource utilization, saving production costs, achieving zero discharge at the well site, and fundamentally solving the environmental protection problem at the well site. This technical solution is solid-liquid separation, not to quickly restore the performance of the recyclable drilling fluid.

[0004] Related patent literature: CN103015927A discloses a method for optimizing the treatment and reuse of waste drilling fluid, including the steps of maintaining and reserving waste drilling fluid, preparing 0.1-0.3% bactericide, 0.1-0.2% deoxidizer, 0.1-0.2% alkalinity controller and 0.05-0.2% dispersant in percentage by mass of the waste drilling fluid for standby use; and carrying out the following procedures at normal temperature and pressure: a. adding the bactericide in the above proportion to the waste drilling fluid every four days and performing a total bacterial count test using a 3M test piece; b. adding the deoxidizer in the above proportion to the waste drilling fluid every five days; c. adding the alkalinity controller in the above proportion to the waste drilling fluid every seven days and measuring the pH value of the waste drilling fluid to keep it between 10 and 11; d. adding the dispersant in the above proportion to the waste drilling fluid every seven days. This method is particularly suitable for horizontal well drilling operations, greatly relieves environmental pressure and reduces drilling fluid costs, and solves the problem of the inability to effectively remove micron- and submicron-sized solids in the prior art. This technical solution is to effectively remove micron- and submicron-sized solids in the waste drilling fluid, not to quickly restore the performance of the recyclable drilling fluid.

[0005] The above technology does not provide specific guidance on how to achieve the reuse of high-value drilling fluid, reduce the processing cost of recoverable drilling fluid, improve the processing efficiency of recoverable drilling fluid, and quickly restore the performance of recoverable drilling fluid. Summary of the invention

[0006] The purpose of the present invention is to provide a treatment agent for recovering the performance of recoverable drilling fluid, which has good treatment effect, can realize the reuse of high-value drilling fluid, reduce the treatment cost of recoverable drilling fluid, improve the treatment efficiency of recoverable drilling fluid, and enable the recoverable drilling fluid to quickly recover its performance.

[0007] To this end, another object of the present invention is to provide a processing system for recovering the properties of recoverable drilling fluid.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A treatment agent for recovering the performance of recoverable drilling fluid (or a treatment agent for recovering the performance of recoverable drilling fluid), the technical solution of which is that it comprises an activator for recovering the performance of recoverable drilling fluid, a modifier for recovering the performance of recoverable drilling fluid, and a stabilizer for recovering the performance of recoverable drilling fluid; by mass: The activator comprises 45-60 parts of disodium ethylenediaminetetraacetate, 5-10 parts of sodium silicate, 5-8 parts of anionic polyacrylamide and 200-210 parts of water.

[0009] The modifier comprises 20-30 parts of diethylenetriamine, 4-8 parts of monohalogenated alkane, 30-45 parts of 1,3-propane sultone, 10-12 parts of isopropanol, 8-15 parts of polyethylene glycol, 1-2.5 parts of calcium carbonate whisker, and a pH adjuster (which may be a sodium hydroxide solution, and its amount should meet the requirement of achieving the pH value of the solution after adjustment).

[0010] The stabilizer comprises 15-30 parts of polymethacrylate-2-hydroxyethyl ester (i.e., polymethacrylate-2-hydroxyethyl ester), 15-20 parts of methacryloyl chloride, 5-10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 80-100 parts of tetrahydrofuran, 0.1-0.3 parts of a crosslinking agent, 0.07-0.1 parts of an initiator, 100-120 parts of deionized water, and a pH regulator (which may be sodium hydroxide, and its amount should meet the requirement of achieving the pH value of the solution after adjustment); the crosslinking agent is divinylbenzene.

[0011] In the above technical scheme, the preferred technical scheme may be that the activator, modifier and stabilizer are mixed into the recyclable drilling fluid to be treated and stirred evenly, the activator powder is added in an amount of 0.05% to 0.15% of the mass of the recyclable drilling fluid to be treated, the modifier powder is added in an amount of 0.025% to 0.05% of the mass of the recyclable drilling fluid to be treated, and the stabilizer powder is added in an amount of 0.025% to 0.05% of the mass of the recyclable drilling fluid to be treated; when added to the recyclable drilling fluid, the concentration of the activator aqueous solution is 10-15 g / L (the solvent is water), the concentration of the modifier aqueous solution is 10-20 g / L (the solvent is water), and the concentration of the stabilizer aqueous solution is 1-3 g / L (the solvent is water).

[0012] The preparation method of the activator is as follows: dissolve disodium ethylenediaminetetraacetic acid, sodium silicate and anionic polyacrylamide in water according to the above mass fractions, mix them evenly, use an ammonia buffer solution to adjust the pH value of the solution to 9-11 to obtain a transparent liquid, dry and crush the transparent liquid (pass through a 200-mesh sieve for standby use), and obtain the activator powder. The drying temperature is 100-110° C. The relative molecular mass of the anionic polyacrylamide is 12 million to 15 million.

[0013] In the above technical scheme, the preferred technical scheme can also be that the preparation method of the modifier comprises the following steps: ① dissolving diethylenetriamine and monohalogenated alkane in isopropanol according to the above mass fractions, stirring at 50-60° C. for 4-6 hours to obtain a first solution; ② adding a pH regulator, that is, a 10% mass fraction of sodium hydroxide aqueous solution, to the first solution obtained in step ①, adjusting the pH value of the solution to neutral, and obtaining a second solution; ③ adding 1,3-propanesulfonate to the second solution obtained in step ②. ester, stirring at constant temperature for 4-6h to obtain the third solution; ④ Add polyethylene glycol and calcium carbonate whisker to the third solution obtained in step ③, evaporate the solvent, dry and crush (pass through a 200 mesh sieve for standby use), and obtain the modifier powder; the monohalogenated alkane is one of monochlorododecane, monochlorotetradecane, monochlorohexadecane, monobromododecane, monobromotetradecane, and monobromohexadecane, preferably monobromododecane, and the polyethylene glycol is one of polyethylene glycol 200 and polyethylene glycol 400. In step ①, the stirring speed is 250-350r / min; in step ④, the temperature of the evaporating solvent is 70-80°C, and the drying temperature is 100-110°C.

[0014] The preparation method of the stabilizer comprises the following steps: ① dissolving polymethacrylate-2-hydroxyethyl ester and methacryloyl chloride in tetrahydrofuran according to the above mass fractions, stirring for 3-3.5 hours under a nitrogen environment, filtering, and drying to obtain a reaction monomer; ② dissolving the reaction monomer obtained in step ① and the 2-acrylamido-2-methylpropanesulfonic acid in deionized water, using a pH regulator, i.e., sodium hydroxide, to adjust the pH value of the solution to 7-9, raising the solution temperature to 35-60° C., adding a crosslinking agent, and stirring for 0.5-1 hour under a nitrogen environment to obtain a solution; ③ adding an initiator to the solution obtained in step ②, stirring, reacting at a constant temperature for 4-6 hours, adjusting the temperature to 60-70° C., and keeping warm for 2-4 hours to obtain an intermediate solution; ④ drying the intermediate solution obtained in step ③ (to constant weight), crushing (passing through a 200-mesh sieve for standby use), and obtaining the stabilizer powder; the initiator is 2 , one of 2-azobis(2-methylpropylimidazole) dihydrochloride, azobisimidazolinylpropane dihydrochloride and azobishydroxyethylimidazolinylpropane dihydrochloride. In step ③, the stirring speed is 200-300r / min; in step ④, the drying temperature is 100-110℃.

[0015] A processing system for recovering the performance of recoverable drilling fluid (or a processing system for recovering the performance of recoverable drilling fluid), which uses the processing agent for recovering the performance of recoverable drilling fluid, and the processing system includes a mixer. The technical solution is that the processing system also includes a liquid inlet pipe, a first solenoid valve, the activator solution storage, the modifier solution storage, the stabilizer solution storage, three second solenoid valves, three feeding pumps, a liquid outlet pipe, a third solenoid valve, a liquid outlet pump and a stirring device. The top of the mixer is connected to the liquid inlet pipe of the recoverable drilling fluid, the liquid inlet pipe is provided with a first solenoid valve with a flow meter, the liquid inlet pipe is connected to the bottom of the activator solution storage, the bottom of the modifier solution storage, and the bottom of the stabilizer solution storage through pipelines, the liquid inlet pipe and each connecting pipeline of the activator solution storage, the modifier solution storage, and the stabilizer solution storage are provided with a combination of a second solenoid valve with a flow meter and a feeding pump, the bottom of the mixer is connected to the liquid outlet pipe, the liquid outlet pipe is provided with a third solenoid valve and a liquid outlet pump, and a stirring device is provided in the mixer.

[0016] In the above technical solution, the preferred technical solution can also be that the stirring device includes a motor, a vertically arranged rotating rod, a round shell, a driving gear, at least two horizontally arranged driven gears, an inner gear ring (i.e., a gear ring), a plurality of connecting rods corresponding to the driven gears one by one, a plurality of fourth bearings corresponding to the plurality of connecting rods one by one, two cross bars, two vertical bars, a plurality of first stirring blades and a plurality of second stirring blades, and the number of the first stirring blades and the number of the second stirring blades are preferably multiple. The number of driven gears can be two, and the number of connecting rods and the number of fourth bearings are both two. The motor is located above the top center of the mixer, the rotating rod passes through the top of the mixer and is rotatably connected to the top of the mixer through a first sealed bearing, the top protruding end of the rotating rod is fixedly connected to the power output end of the motor, and the bottom of the rotating rod is rotatably connected to the bottom of the mixer through a second sealed bearing. In the mixer, a round shell is arranged on the upper part of the rotating rod, the rotating rod passes through the middle part of the round shell, and the rotating rod is rotatably connected to the top and bottom of the round shell respectively through a third sealed bearing, and a transversely arranged driving gear is fixedly installed on the part of the rotating rod located in the round shell, the driving gear is meshed with all the driven gears, and each of the driven gears is meshed with an inner gear ring arranged on the inner side wall of the round shell.

[0017] The center of the bottom end of each driven gear is rotatably connected to the top of a corresponding vertically arranged connecting rod through a fourth bearing, the bottom of the connecting rod is fixedly connected to the bottom inner wall of the circular shell, and two cross bars are symmetrically arranged on the outside of the circular shell, one end of each of the cross bars is fixedly connected to the outer wall of the circular shell, and the other end of each of the cross bars is fixedly connected to the top of a corresponding vertical rod, and the part of the rotating rod located below the circular shell is provided with several first stirring blades from top to bottom, and each vertical rod is provided with several second stirring blades from top to bottom, and the several first stirring blades and the several second stirring blades are staggered (alternated).

[0018] In the above technical scheme, the preferred technical scheme can also be that the processing system for recovering the performance of the recoverable drilling fluid also has an activator powder storage device, a modifier powder storage device, a stabilizer powder storage device, three pairs of support rods, three weighing modules, three pipelines, three fourth solenoid valves, three powder pumps, three water inlet pipes and three fifth solenoid valves. A pair of support rods are installed on the top of the activator solution storage, the top of the modifier solution storage, and the top of the stabilizer solution storage. The top of the activator solution storage, the top of the modifier solution storage, and the top of the stabilizer solution storage are each connected to the bottom of the activator powder storage, the bottom of the modifier powder storage, and the bottom of the stabilizer powder storage through a corresponding pipeline. A fourth solenoid valve and a powder pump are provided on each of the pipelines. A weighing module is provided between the two side legs of the activator powder storage, the two side legs of the modifier powder storage, and the two side legs of the stabilizer powder storage and the top of the corresponding pair of support rods. The top of the activator solution storage, the top of the modifier solution storage, and the top of the stabilizer solution storage are each connected to a water inlet pipe, and a fifth solenoid valve with a flow meter is provided on each of the water inlet pipes.

[0019] In the above technical solution, the preferred technical solution can also be that the processing system for recovering the performance of the recoverable drilling fluid also has three cover plates, three handles, three liquid level sensors, and three oscillators. The upper end surface opening of the activator powder storage container, the upper end surface opening of the modifier powder storage container, and the upper end surface opening of the stabilizer powder storage container are each provided with a cover plate, one side of each of the cover plates is hinged to one side of the corresponding upper end surface opening, and each of the cover plates is provided with a handle. The top inner side wall of the activator solution storage container, the top inner side wall of the modifier solution storage container, and the top inner side wall of the stabilizer solution storage container are respectively provided with liquid level sensors, and the inner (inner) outer wall of the activator solution storage container, the inner outer wall of the modifier solution storage container, and the inner outer wall of the stabilizer solution storage container are respectively provided with oscillators.

[0020] The present invention restores the performance of the recyclable drilling fluid (recyclable drilling fluid with solids removed) after solid-liquid separation by adding the activator, modifier and stabilizer. Specifically, the activation of clay is improved by the activator, and the presence of free water is reduced; the rheological stability, filtration loss reduction, temperature resistance and other properties of the mud are improved by the modifier; the performance fluctuation of the recyclable drilling fluid under long-term storage can be limited by the stabilizer. The present invention is not solid-liquid separation, but screening out harmful solid phases, such as rock cuttings in the formation during drilling, and it is necessary to retain favorable solid phases in the drilling fluid. The present invention dissolves the activator, modifier and stabilizer in advance and then adds them to the mixer to mix with the recyclable drilling fluid. The mixer in the present invention adopts a stirring device with reverse rotation inside and outside, thereby effectively improving the mixing efficiency of the activator, modifier, stabilizer and recyclable drilling fluid. According to the test, compared with the existing related technologies, after using the treatment agent and system for recovering the performance of the recoverable drilling fluid of the present invention, the treatment cost of the recoverable drilling fluid is reduced by more than 13%, and the treatment efficiency of the recoverable drilling fluid is improved by more than 15%. Referring to Table 1, the present invention has a good treatment effect, realizes the reuse of high-value drilling fluid, reduces the treatment cost of the recoverable drilling fluid, improves the treatment efficiency of the recoverable drilling fluid, and quickly restores the performance of the recoverable drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 for Figure 1 A partial enlarged view of part I in the middle. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of the present invention. In the following description of the present invention, it should be noted that the orientation or position relationship indicated by directional words such as "horizontal" is usually based on Figure 1 The orientation or position relationship formed by the coordinate system shown.

[0024] Example 1: Figure 1 , Figure 2 As shown, the treatment agent for recovering the performance of the recoverable drilling fluid of the present invention comprises an activator for recovering the performance of the recoverable drilling fluid, a modifier for recovering the performance of the recoverable drilling fluid, and a stabilizer for recovering the performance of the recoverable drilling fluid. Calculated by mass: The activator comprises 50 parts of disodium ethylenediaminetetraacetate, 6 parts of sodium silicate, 5 parts of anionic polyacrylamide and 200 parts of water.

[0025] The modifier comprises 22 parts of diethylenetriamine, 5 parts of monohalogenated alkane, 32 parts of 1,3-propane sultone, 10 parts of isopropanol, 9 parts of polyethylene glycol, 1 part of calcium carbonate whisker, and a pH regulator. The pH regulator can be a sodium hydroxide solution, and its dosage should meet the requirement of reaching the pH value of the solution after adjustment.

[0026] The stabilizer includes 18 parts of polymethacrylate-2-hydroxyethyl ester (i.e., polymethacrylate-2-hydroxyethyl ester), 16 parts of methacryloyl chloride, 6 parts of 2-acrylamido-2-methylpropanesulfonic acid, 85 parts of tetrahydrofuran, 0.1 parts of a crosslinking agent, 0.07 parts of an initiator, 105 parts of deionized water, and a pH regulator. The pH regulator can be sodium hydroxide, and its amount should meet the requirement of achieving the pH value of the solution after adjustment; the crosslinking agent is divinylbenzene.

[0027] The present invention adds the activator, modifier and stabilizer to the recyclable drilling fluid (recyclable drilling fluid with solids removed) after solid-liquid separation, thereby restoring the performance of the recyclable drilling fluid so that it can be reused. Specifically, the activation of clay is improved by the activator, and the presence of free water is reduced; the rheological stability, filtration loss reduction, temperature resistance and other properties of the mud are improved by the modifier; the performance fluctuation of the recyclable drilling fluid under long-term storage can be limited by the stabilizer. The present invention is not solid-liquid separation, but screening out harmful solid phases, such as rock cuttings in the formation during drilling, and it is necessary to retain favorable solid phases in the drilling fluid. The present invention dissolves the activator, modifier and stabilizer in advance and then adds them to the mixer to mix with the recyclable drilling fluid, and the mixer in the present invention adopts a stirring device with internal and external reverse rotation, thereby effectively improving the mixing efficiency of the activator, modifier, stabilizer and recyclable drilling fluid.

[0028] The activator, modifier and stabilizer are mixed into the recyclable drilling fluid to be treated and stirred evenly. Specifically, the amount of the activator powder added is 0.07% of the mass of the recyclable drilling fluid to be treated, the amount of the modifier powder added is 0.03% of the mass of the recyclable drilling fluid to be treated, and the amount of the stabilizer powder added is 0.025% of the mass of the recyclable drilling fluid to be treated; when added to the recyclable drilling fluid, the concentration of the activator aqueous solution is 12g / L, the concentration of the modifier aqueous solution is 12g / L, and the concentration of the stabilizer aqueous solution is 1g / L.

[0029] The preparation method of the activator is as follows: dissolve disodium ethylenediaminetetraacetic acid, sodium silicate and anionic polyacrylamide in water according to the above mass fractions, mix them evenly, use an ammonia buffer solution to adjust the pH value of the solution to 9 to obtain a transparent liquid, dry and crush the transparent liquid (pass through a 200-mesh sieve for standby use), and obtain the activator powder. The drying temperature is 100° C. The relative molecular mass of the anionic polyacrylamide is 12 million.

[0030] The beneficial effects of adding the activator of the present invention to the recyclable drilling fluid are as follows: (1) disodium ethylenediaminetetraacetic acid (EDTA) complexes high-valent metal ions, thereby improving the stability of the drilling fluid system; (2) silicate ions are colloided in clay and easily adsorbed on the clay surface, thereby improving the negative charge of the clay and the activity of the drilling fluid. At the same time, silicate ions can form precipitation with metal ions such as calcium and magnesium ions in the drilling fluid, thereby eliminating the adverse effects of high-valent metal ions on the drilling fluid, such as flocculation; (3) macromolecular anionic polyacrylamide can be adsorbed on the clay surface, thereby improving the dispersibility and activity of the clay.

[0031] The preparation method of the modifier comprises the following steps: ① dissolving diethylenetriamine and monohalogenated alkane in isopropanol according to the above mass fractions, stirring at 50° C. for 4 hours to obtain a first solution; ② adding a pH regulator, that is, a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step ①, adjusting the pH value of the solution to neutral, and obtaining a second solution; ③ adding 1,3-propane sultone to the second solution obtained in step ②, stirring at a constant temperature for 4 hours to obtain a third solution; ④ adding polyethylene glycol and calcium carbonate whiskers to the third solution obtained in step ③, evaporating the solvent, drying, and crushing (passing through a 200-mesh sieve for standby use) to obtain the modifier powder; the monohalogenated alkane is one of monochlorododecane, monochlorotetradecane, monochlorohexadecane, monobromododecane, monobromotetradecane, and monobromohexadecane. In this embodiment, monobromododecane is selected, and the polyethylene glycol is one of polyethylene glycol 200 and polyethylene glycol 400. In this embodiment, polyethylene glycol 400 is selected. In step ①, the stirring speed is 250 r / min; in step ④, the temperature of the evaporating solvent is 70°C, and the drying temperature is 100°C.

[0032] The beneficial effects of adding the modifier of the present invention to the recoverable drilling fluid are as follows: (1) the modifier contains a sulfonic acid-type double-headed surfactant component, which can fully disperse clay particles and improve the dispersion stability of clay. At the same time, it improves the contact between clay and other treatment agents, which is beneficial to the adsorption of the treatment agent on the clay surface and exerts the effectiveness of the treatment agent. In addition, the presence of the sulfonic acid group improves the temperature resistance of the system; (2) polyethylene glycol and the sulfonic acid-type double-headed surfactant component interact with each other to exert synergistic effect, further improving the adsorption capacity of clay; (3) the sulfonic acid-type double-headed surfactant has a special rheological behavior, has little effect on the viscosity of the system, and can ensure the rheological stability of the system; (4) calcium carbonate whiskers are fluffy needle-shaped solid powders, which can play a skeleton role in the mud cake, improve the hardness and density of the mud cake, improve the quality of the mud cake, and reduce the filtration loss. It also has good thermal recovery performance and can be reused, which reduces the cost.

[0033] The preparation method of the stabilizer comprises the following steps: ① dissolving polymethacrylate-2-hydroxyethyl ester and methacryloyl chloride in tetrahydrofuran according to the above mass fractions, stirring for 3 hours under a nitrogen environment, filtering, and drying to obtain a reaction monomer; ② dissolving the reaction monomer obtained in step ① and the 2-acrylamido-2-methylpropanesulfonic acid in deionized water, using a pH regulator, i.e., sodium hydroxide, to adjust the pH value of the solution to 7.5, raising the solution temperature to 45°C, adding a crosslinking agent, and stirring for 0.5 hours under a nitrogen environment to obtain a solution; ③ adding an initiator to the solution obtained in step ②, stirring, reacting at a constant temperature for 4.5 hours, adjusting the temperature to 60°C, and keeping warm for 2.5 hours to obtain an intermediate solution; ④ drying the intermediate solution obtained in step ③ (to constant weight), crushing (passing through a 200-mesh sieve for standby use), and obtaining the stabilizer powder; the initiator is 2 ,2-azobis(2-methylpropylimidazole) dihydrochloride, azobisimidazolinylpropane dihydrochloride and azobishydroxyethylimidazolinylpropane dihydrochloride. In this embodiment, 2,2-azobis(2-methylpropylimidazole) dihydrochloride is selected. In step ③, the stirring speed is 200r / min; in step ④, the drying temperature is 100℃.

[0034] The beneficial effect of adding the stabilizer of the present invention to the recoverable drilling fluid is that the stabilizer contains a partial sparse structure, which helps to maintain the stability of the colloid and limit the performance fluctuation of the drilling fluid during long-term storage.

[0035] Example 2: Figure 1 , Figure 2As shown, the processing system for recovering the performance of recoverable drilling fluid of the present invention adopts the above-mentioned treating agent for recovering the performance of recoverable drilling fluid, and the processing system comprises a mixer 1. The processing system also comprises a liquid inlet pipe 2, a first solenoid valve 3, the activator solution storage 4, the modifier solution storage 5, the stabilizer solution storage 6, three second solenoid valves 7, three feed pumps 8, a liquid outlet pipe 9, a third solenoid valve 10, a liquid outlet pump 11 and a stirring device. The top of the mixer 1 is connected to the inlet pipe 2 of the recoverable drilling fluid, and the inlet pipe 2 is provided with a first solenoid valve 3 with a flow meter. The inlet pipe 2 is respectively connected to the bottom of the activator solution storage 4, the bottom of the modifier solution storage 5, and the bottom of the stabilizer solution storage 6 through pipelines. The inlet pipe 2 and each connecting pipeline of the activator solution storage 4, the modifier solution storage 5, and the stabilizer solution storage 6 are provided with a combination of a second solenoid valve 7 with a flow meter and a feeding pump 8. The bottom of the mixer 1 is connected to the outlet pipe 9, and the outlet pipe 9 is provided with a third solenoid valve 10 and an outlet pump 11. A stirring device is provided in the mixer 1.

[0036] The activator solution, modifier solution and stabilizer solution prepared in advance are fed into the inlet pipe 2 of the recyclable drilling fluid through the feed pump 8, so as to achieve the preliminary mixing of the activator solution, modifier solution and stabilizer solution with the recyclable drilling fluid, and then quickly mixed through the mixer 1, and finally the treated drilling fluid is discharged from the outlet pipe 9 through the outlet pump 11, so as to achieve the reuse (re-use) of the recyclable drilling fluid. At the same time, the addition amount of the drilling fluid and the addition amount of the activator solution, modifier solution and stabilizer solution are monitored in real time through the first solenoid valve 3 with a flow meter and the second solenoid valve 7 with a flow meter, so as to ensure that the addition amount of the activator solution, modifier solution and stabilizer solution is within the specified range, so as to ensure that the activator solution, modifier solution and stabilizer solution can be saved while restoring the performance of the recyclable drilling fluid.

[0037] The stirring device includes a motor 12, a vertically arranged rotating rod 13, a round shell 16, a driving gear 18, at least two horizontally arranged driven gears 19, an inner gear ring 20, a plurality of connecting rods 22 corresponding to the driven gears 19, a plurality of fourth bearings 21 corresponding to the plurality of connecting rods 22, two cross bars 23, two vertical bars 24, a plurality of first stirring blades 25 and a plurality of second stirring blades 26. The number of the first stirring blades 25 and the second stirring blades 26 can be multiple. In this embodiment, the number of the driven gears 19 is two, the number of the connecting rods 22 is two, the number of the fourth bearings 21 is two, the number of the first stirring blades 25 can be five, and the number of the second stirring blades 26 is four. Alternatively, the number of the first stirring blades 25 can be seven, and the number of the second stirring blades 26 can be six.

[0038] The motor 12 is located above the top center of the mixer 1, the rotating rod 13 passes through the top of the mixer 1 and is rotatably connected to the top of the mixer 1 through the first sealed bearing 14, the top protruding end of the rotating rod 13 is fixedly connected to the power output end of the motor 12, and the bottom of the rotating rod 13 is rotatably connected to the bottom of the mixer 1 through the second sealed bearing 15. In the mixer 1, a round shell 16 is provided on the upper part of the rotating rod 13, the rotating rod 13 passes through the middle part of the round shell 16, and the rotating rod 13 is rotatably connected to the top and bottom of the round shell 16 through a third sealed bearing 17 respectively. A transversely arranged driving gear 18 is fixedly installed on the part of the rotating rod 13 located in the round shell 16, and the driving gear 18 is meshed with all the driven gears 19, and each of the driven gears 19 is meshed with an inner gear ring 20 arranged on the inner side wall of the round shell 16.

[0039] The center of the bottom end of each driven gear 19 is rotatably connected to the top of a corresponding vertically arranged connecting rod 22 through a fourth bearing 21. The bottom of the connecting rod 22 is fixedly connected to the bottom inner wall of the circular shell 16. Two cross bars 23 are symmetrically arranged on the outside of the circular shell 16. One end of each of the cross bars 23 is fixedly connected to the outer side wall of the circular shell 16, and the other end of each of the cross bars 23 is fixedly connected to the top of a corresponding vertical rod 24. The part of the rotating rod 13 located below the circular shell 16 is provided with several first stirring blades 25 from top to bottom, and each vertical rod 24 is provided with several second stirring blades 26 from top to bottom. The several first stirring blades 25 and the several second stirring blades 26 are staggered (alternated) at intervals.

[0040] In the present invention, the transfer rod 13 drives the driving gear 18 to rotate, thereby driving the driven gear 19 to rotate in the opposite direction to the driving gear 18. The rotation of the driven gear 19 drives the internally arranged inner ring gear 20 to rotate, and the circular shell 16 and the driven gear 19 rotate in the same direction, so that the transfer rod 13 and the first stirring blade 25 both rotate in the opposite direction to the circular shell 16, and the horizontal rod 23, the vertical rod 24 and the second stirring blade 26 fixedly connected to the circular shell 16 rotate in the opposite direction on the outside of the transfer rod 13 and the first stirring blade 25, realizing the inside-outside reversal of the first stirring blade 25 and the second stirring blade 26, thereby accelerating the stirring of the recoverable drilling fluid and the treatment agent of the present invention, and improving the mixing efficiency of the recoverable drilling fluid and the treatment agent of the present invention. At the same time, the first stirring blade 25 and the second stirring blade 26 will not come into contact during the rotation process, thereby ensuring that they can be used stably for a long time.

[0041] The processing system for recovering the performance of the recyclable drilling fluid also has an activator powder storage container 27, a modifier powder storage container 28, a stabilizer powder storage container 29, three pairs of support rods 32, three weighing modules 33, three pipelines 39, three fourth solenoid valves 30, three powder pumps 31, three water inlet pipes 34 and three fifth solenoid valves 35. A pair of support rods 32 are installed on the top of the activator solution storage 4, the top of the modifier solution storage 5, and the top of the stabilizer solution storage 6. The top of the activator solution storage 4, the top of the modifier solution storage 5, and the top of the stabilizer solution storage 6 are each connected to the bottom of the activator powder storage 27, the bottom of the modifier powder storage 28, and the bottom of the stabilizer powder storage 29 through a corresponding pipeline 39. A fourth solenoid valve 30 and a powder pump 31 are provided on each of the pipelines 39. A weighing module 33 is provided between the two side legs of the activator powder storage 27, the two side legs of the modifier powder storage 28, and the two side legs of the stabilizer powder storage 29 and the top of the corresponding pair of support rods 32. The top of the activator solution storage 4, the top of the modifier solution storage 5, and the top of the stabilizer solution storage 6 are each connected to a water inlet pipe 34, and each of the water inlet pipes 34 is provided with a fifth solenoid valve 35 with a flow meter. The present invention arranges weighing modules 33 at the fixed connection positions of the two side legs of the activator powder storage container 27, the two side legs of the modifier powder storage container 28, and the two side legs of the stabilizer powder storage container 29, so as to accurately know the addition amount of the activator powder, the modifier powder, and the stabilizer powder, and control the closing of the fourth solenoid valve 30 and the powder pump 31 when the specified amount is added, and at the same time, the specified amount of water can be accurately added through the fifth solenoid valve 35 with a flow meter arranged on the water inlet pipe 34 (opening and closing), thereby ensuring the accuracy of the solution concentration after configuration.

[0042] The processing system for recovering the performance of the recyclable drilling fluid also has three cover plates 36, three handles 37, three liquid level sensors 38 and three oscillators 40. The upper end surface opening of the activator powder storage container 27, the upper end surface opening of the modifier powder storage container 28, and the upper end surface opening of the stabilizer powder storage container 29 are each provided with a cover plate 36, one side of each of the cover plates 36 is hinged to one side of the corresponding upper end surface opening, and each of the cover plates 36 is provided with a handle 37. When the weighing module 33 detects that the weight of the activator powder, the modifier powder, or the stabilizer powder is lower than a predetermined value, the present invention sends a reminder to the relevant personnel to add materials. At the same time, by opening the cover plate 36, it can prevent foreign impurities from mixing into the activator powder storage container 27, the modifier powder storage container 28, and the stabilizer powder storage container 29, and it is convenient to add materials and use. The controlled end of the first electromagnetic valve 3, the controlled end of the second electromagnetic valve 7, the controlled end of the third electromagnetic valve 10, the controlled end of the fourth electromagnetic valve 30, the controlled end of the fifth electromagnetic valve 35, the controlled end of the liquid level sensor 38, the controlled end of the oscillator 40, the controlled end of the feed pump 8, the controlled end of the liquid discharge pump 11, and the controlled end of the powder pump 31 are all connected to the PLC controller, and each weighing module 33 is electrically connected to the PLC controller. The controlled end of the motor 12 is connected to the signal output end of the PLC controller.

[0043] The top inner wall of the activator solution storage 4, the top inner wall of the modifier solution storage 5, and the top inner wall of the stabilizer solution storage 6 are all provided with a liquid level sensor 38, and the inner outer wall of the activator solution storage 4, the inner outer wall of the modifier solution storage 5, and the inner outer wall of the stabilizer solution storage 6 are all provided with an oscillator 40. The liquid level sensor 38 of the present invention can monitor the liquid level changes in the activator solution storage 4, the modifier solution storage 5, and the stabilizer solution storage 6 in real time. When the liquid level is lower than a predetermined value, a solution is prepared once. At this time, the third electromagnetic valve 10 and the liquid outlet pump 11 can be controlled to close to ensure the stable operation of the processing system. At the same time, the oscillator can accelerate the dissolution of the powdered material. When used for a long time, it can be opened regularly to avoid solid precipitation, thereby ensuring the accuracy of the solution concentration.

[0044] Example 3: The treating agent for recovering the performance of the recoverable drilling fluid includes an activator for recovering the performance of the recoverable drilling fluid, a modifier for recovering the performance of the recoverable drilling fluid, and a stabilizer for recovering the performance of the recoverable drilling fluid. Calculated by mass: The activator comprises 55 parts of disodium ethylenediaminetetraacetate, 8 parts of sodium silicate, 7 parts of anionic polyacrylamide and 205 parts of water.

[0045] The modifier includes 25 parts of diethylenetriamine, 6 parts of monohalogenated alkane, 40 parts of 1,3-propane sultone, 11 parts of isopropanol, 12 parts of polyethylene glycol, 2 parts of calcium carbonate whiskers, and a pH adjuster (which can be a sodium hydroxide solution, and its amount should meet the requirement of achieving the pH value of the solution after adjustment).

[0046] The stabilizer includes 25 parts of polymethacrylate-2-hydroxyethyl ester (i.e., polymethacrylate-2-hydroxyethyl ester), 18 parts of methacryloyl chloride, 8 parts of 2-acrylamido-2-methylpropanesulfonic acid, 90 parts of tetrahydrofuran, 0.2 parts of a crosslinking agent, 0.09 parts of an initiator, 110 parts of deionized water, and a pH adjuster (which may be sodium hydroxide, and its amount should meet the requirement of achieving the pH value of the solution after adjustment); the crosslinking agent is divinylbenzene.

[0047] The activator, modifier and stabilizer are mixed into the recyclable drilling fluid to be treated and stirred evenly. Specifically, the amount of the activator powder added is 0.12% of the mass of the recyclable drilling fluid to be treated, the amount of the modifier powder added is 0.04% of the mass of the recyclable drilling fluid to be treated, and the amount of the stabilizer powder added is 0.03% of the mass of the recyclable drilling fluid to be treated; when added to the recyclable drilling fluid, the concentration of the activator aqueous solution is 13g / L, the concentration of the modifier aqueous solution is 17g / L, and the concentration of the stabilizer aqueous solution is 2g / L.

[0048] The preparation method of the activator is as follows: dissolve disodium ethylenediaminetetraacetic acid, sodium silicate and anionic polyacrylamide in water according to the above mass fractions, mix them evenly, use an ammonia buffer solution to adjust the pH value of the solution to 10 to obtain a transparent liquid, dry and crush the transparent liquid (pass through a 200-mesh sieve for standby use), and obtain the activator powder. The drying temperature is 105° C. The relative molecular mass of the anionic polyacrylamide is 13 million.

[0049] The preparation method of the modifier comprises the following steps: ① dissolving diethylenetriamine and monohalogenated alkane in isopropanol according to the above mass fractions, stirring at 55° C. for 5 hours to obtain a first solution; ② adding a pH regulator, that is, a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step ①, adjusting the pH value of the solution to neutral, and obtaining a second solution; ③ adding 1,3-propane sultone to the second solution obtained in step ②, stirring at a constant temperature for 5 hours to obtain a third solution; ④ adding polyethylene glycol and calcium carbonate whiskers to the third solution obtained in step ③, evaporating the solvent, drying, and crushing (passing through a 200-mesh sieve for standby use) to obtain the modifier powder; the monohalogenated alkane is one of monochlorododecane, monochlorotetradecane, monochlorohexadecane, monobromododecane, monobromotetradecane, and monobromohexadecane. In this embodiment, monochlorododecane is selected, and the polyethylene glycol is one of polyethylene glycol 200 and polyethylene glycol 400. In this embodiment, polyethylene glycol 200 is selected. In step ①, the stirring speed is 300 r / min; in step ④, the temperature of the evaporating solvent is 75°C, and the drying temperature is 110°C.

[0050] The preparation method of the stabilizer comprises the following steps: ① dissolving polymethacrylate-2-hydroxyethyl ester and methacryloyl chloride in tetrahydrofuran according to the above mass fractions, stirring for 3.5 hours under a nitrogen environment, filtering, and drying to obtain a reaction monomer; ② dissolving the reaction monomer obtained in step ① and the 2-acrylamide-2-methylpropanesulfonic acid in deionized water, using a pH regulator, i.e., sodium hydroxide, to adjust the pH value of the solution to 9, raising the solution temperature to 55° C., adding a crosslinking agent, and stirring for 1 hour under a nitrogen environment to obtain a solution; ③ adding an initiator to the solution obtained in step ②, stirring, reacting at a constant temperature for 6 hours, adjusting the temperature to 70° C., and keeping warm for 4 hours to obtain an intermediate solution; ④ drying the intermediate solution obtained in step ③ (to constant weight), crushing (passing through a 200-mesh sieve for standby use), and obtaining the stabilizer powder; the initiator is 2 , one of 2-azobis(2-methylpropylimidazole) dihydrochloride, azobisimidazolinylpropane dihydrochloride and azobishydroxyethylimidazolinylpropane dihydrochloride, and azobisimidazolinylpropane dihydrochloride is selected in this embodiment. In step ③, the stirring speed is 300r / min; in step ④, the drying temperature is 110℃.

[0051] Example 4: The treatment agent for recovering the performance of the recoverable drilling fluid includes an activator for recovering the performance of the recoverable drilling fluid, a modifier for recovering the performance of the recoverable drilling fluid, and a stabilizer for recovering the performance of the recoverable drilling fluid. Calculated by mass: The activator comprises 60 parts of disodium ethylenediaminetetraacetate, 9 parts of sodium silicate, 7 parts of anionic polyacrylamide and 210 parts of water.

[0052] The modifier includes 30 parts of diethylenetriamine, 7 parts of monohalogenated alkane, 43 parts of 1,3-propane sultone, 12 parts of isopropanol, 14 parts of polyethylene glycol, 2.5 parts of calcium carbonate whiskers, and a pH adjuster (which can be a sodium hydroxide solution, and its amount should meet the requirement of achieving the pH value of the solution after adjustment).

[0053] The stabilizer includes 28 parts of polymethacrylate-2-hydroxyethyl ester (i.e., polymethacrylate-2-hydroxyethyl ester), 20 parts of methacryloyl chloride, 9 parts of 2-acrylamido-2-methylpropanesulfonic acid, 90 parts of tetrahydrofuran, 0.3 parts of a crosslinking agent, 0.1 parts of an initiator, 120 parts of deionized water, and a pH adjuster (which may be sodium hydroxide, and its amount should meet the requirement of achieving the pH value of the solution after adjustment); the crosslinking agent is divinylbenzene.

[0054] The activator, modifier and stabilizer are mixed into the recyclable drilling fluid to be treated and stirred evenly. Specifically, the amount of the activator powder added is 0.15% of the mass of the recyclable drilling fluid to be treated, the amount of the modifier powder added is 0.05% of the mass of the recyclable drilling fluid to be treated, and the amount of the stabilizer powder added is 0.05% of the mass of the recyclable drilling fluid to be treated; when added to the recyclable drilling fluid, the concentration of the activator aqueous solution is 14g / L, the concentration of the modifier aqueous solution is 20g / L, and the concentration of the stabilizer aqueous solution is 3g / L.

[0055] The preparation method of the activator is as follows: dissolve disodium ethylenediaminetetraacetic acid, sodium silicate and anionic polyacrylamide in water according to the above mass fractions, mix them evenly, use an ammonia buffer solution to adjust the pH value of the solution to 11 to obtain a transparent liquid, dry and crush the transparent liquid (pass through a 200-mesh sieve for standby use), and obtain the activator powder. The drying temperature is 110° C. The relative molecular mass of the anionic polyacrylamide is 15 million.

[0056] The preparation method of the modifier comprises the following steps: ① dissolving diethylenetriamine and monohalogenated alkane in isopropanol according to the above mass fractions, stirring at 60°C for 4 hours to obtain a first solution; ② adding a pH regulator, that is, a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step ①, adjusting the pH value of the solution to neutral, and obtaining a second solution; ③ adding 1,3-propane sultone to the second solution obtained in step ②, stirring at a constant temperature for 6 hours, and obtaining a third solution; ④ adding In step ③, polyethylene glycol and calcium carbonate whisker are added to the third solution obtained, the solvent is evaporated, dried, and crushed (passed through a 200-mesh sieve for standby use) to obtain the modifier powder; the monohalogenated alkane is one of monochlorododecane, monochlorotetradecane, monochlorohexadecane, monobromododecane, monobromotetradecane, and monobromohexadecane, and monobromododecane is selected in this embodiment; the polyethylene glycol is one of polyethylene glycol 200 and polyethylene glycol 400, and polyethylene glycol 200 is selected in this embodiment. In step ①, the stirring speed is 350r / min; in step ④, the temperature of the evaporating solvent is 80°C, and the drying temperature is 110°C.

[0057] The preparation method of the stabilizer comprises the following steps: ① dissolving polymethacrylate-2-hydroxyethyl ester and methacryloyl chloride in tetrahydrofuran according to the above mass fractions, stirring for 3.5 hours under a nitrogen environment, filtering, and drying to obtain a reaction monomer; ② dissolving the reaction monomer obtained in step ① and the 2-acrylamido-2-methylpropanesulfonic acid in deionized water, using a pH regulator, i.e., sodium hydroxide, to adjust the pH value of the solution to 8, raising the solution temperature to 60° C., adding a crosslinking agent, and stirring for 1 hour under a nitrogen environment to obtain a solution; ③ adding an initiator to the solution obtained in step ②, stirring, reacting at a constant temperature for 5 hours, adjusting the temperature to 70° C., and keeping warm for 4 hours to obtain an intermediate solution; ④ drying the intermediate solution obtained in step ③ (to constant weight), crushing (passing through a 200-mesh sieve for standby use), and obtaining the stabilizer powder; the initiator is 2 , one of 2-azobis(2-methylpropylimidazole) dihydrochloride, azobisimidazolinylpropane dihydrochloride and azobishydroxyethylimidazolinylpropane dihydrochloride, and azobishydroxyethylimidazolinylpropane dihydrochloride is selected in this embodiment. In step ③, the stirring speed is 250r / min; in step ④, the drying temperature is 105℃.

[0058] The recoverable drilling fluids selected in the above-mentioned embodiments 1, 3 and 4 of the present invention are from the same batch, and their initial properties are tested. Then, the recoverable drilling fluids treated in the above-mentioned embodiments 1, 3 and 4 of the present invention are tested for their properties. The test results are shown in Table 1.

[0059] Table 1

[0060] It can be seen from the data in Table 1 that the apparent viscosity, plastic viscosity, dynamic shear force, static shear force, dynamic shear force / plastic viscosity, consistency coefficient, high temperature and high pressure filtration loss reduction of the recoverable drilling fluid treated by Examples 1, 3 and 4 of the present invention are significantly reduced, and the flow index is significantly improved. The performance of the recoverable drilling fluid treated by Examples 1, 3 and 4 of the present invention can be restored, so that the recoverable drilling fluid can be recycled and reused after treatment, thereby realizing the reuse of the recoverable drilling fluid, effectively reducing the use cost of the drilling fluid in the oil production process; at the same time, the present invention The activator for recovering the performance of the recoverable drilling fluid, the modifier for recovering the performance of the recoverable drilling fluid, and the stabilizer for recovering the performance of the recoverable drilling fluid are dissolved in advance and then added to the mixer to be mixed with the recoverable drilling fluid. The mixer in the present invention adopts an internal and external reverse rotating stirring device, thereby effectively improving the mixing efficiency of the activator for recovering the performance of the recoverable drilling fluid, the modifier for recovering the performance of the recoverable drilling fluid, the stabilizer for recovering the performance of the recoverable drilling fluid and the recoverable drilling fluid, thereby ensuring that the recoverable drilling fluid can quickly recover its performance and be recycled.

[0061] In summary, the above embodiments of the present invention provide a treatment agent for recovering the performance of a recyclable drilling fluid, which can achieve the reuse of high-value drilling fluid, reduce the processing cost of the recyclable drilling fluid, and improve the processing efficiency of the recyclable drilling fluid. According to tests, compared with the existing related technologies, after adopting the treatment agent for recovering the performance of the recyclable drilling fluid and its system of the above embodiments of the present invention, the processing cost of the recyclable drilling fluid is reduced by more than 13%, and the processing efficiency of the recyclable drilling fluid is improved by more than 15%. The present invention has a good treatment effect, achieves the reuse of high-value drilling fluid, reduces the processing cost of the recyclable drilling fluid, improves the processing efficiency of the recyclable drilling fluid, and enables the recyclable drilling fluid to quickly recover its performance.

Claims

1. A treatment agent for recovering drilling fluid performance, characterized in that It includes an activator for recovering the performance of recoverable drilling fluid, a modifier for recovering the performance of recoverable drilling fluid, and a stabilizer for recovering the performance of recoverable drilling fluid; by mass: The activator comprises 45-60 parts of disodium ethylenediaminetetraacetate, 5-10 parts of sodium silicate, 5-8 parts of anionic polyacrylamide, and 200-210 parts of water; The modifier comprises 20-30 parts of diethylenetriamine, 4-8 parts of monohalogenated alkane, 30-45 parts of 1,3-propane sultone, 10-12 parts of isopropanol, 8-15 parts of polyethylene glycol, 1-2.5 parts of calcium carbonate whisker, and a pH regulator; The stabilizer comprises 15-30 parts of polymethacrylate-2-hydroxyethyl ester, 15-20 parts of methacryloyl chloride, 5-10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 80-100 parts of tetrahydrofuran, 0.1-0.3 parts of a crosslinking agent, 0.07-0.1 parts of an initiator, 100-120 parts of deionized water, and a pH regulator; the crosslinking agent is divinylbenzene.

2. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 1, characterized in that The activator, modifier and stabilizer are mixed into the recyclable drilling fluid to be treated and stirred evenly, the activator powder is added in an amount of 0.05% to 0.15% of the mass of the recyclable drilling fluid to be treated, the modifier powder is added in an amount of 0.025% to 0.05% of the mass of the recyclable drilling fluid to be treated, and the stabilizer powder is added in an amount of 0.025% to 0.05% of the mass of the recyclable drilling fluid to be treated; when added into the recyclable drilling fluid, the concentration of the activator aqueous solution is 10-15 g / L, the concentration of the modifier aqueous solution is 10-20 g / L, and the concentration of the stabilizer aqueous solution is 1-3 g / L.

3. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 1, characterized in that The preparation method of the activator is as follows: dissolve disodium ethylenediaminetetraacetate, sodium silicate and anionic polyacrylamide in water according to the above mass fractions, mix them evenly, use an ammonia buffer solution to adjust the pH value of the solution to 9-11 to obtain a transparent liquid, dry and crush the transparent liquid to obtain the activator powder.

4. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 1, characterized in that The preparation method of the modifier comprises the following steps: ① dissolving diethylenetriamine and monohalogenated alkane in isopropanol according to the above mass fractions, stirring at 50-60°C for 4-6 hours to obtain a first solution; ② adding a pH value adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step ①, adjusting the pH value of the solution to neutral, and obtaining a second solution; ③ adding 1,3-propane sultone to the second solution obtained in step ②, stirring at a constant temperature for 4-6 hours to obtain a third solution; ④ adding polyethylene glycol and calcium carbonate whiskers to the third solution obtained in step ③, evaporating the solvent, drying and crushing to obtain the modifier powder; the monohalogenated alkane is one of monochlorododecane, monochlorotetradecane, monochlorohexadecane, monobromododecane, monobromotetradecane and monobromohexadecane.

5. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 4, characterized in that The polyethylene glycol is one of polyethylene glycol 200 and polyethylene glycol 400; in step ①, the stirring speed is 250-350 r / min; in step ④, the temperature of the evaporating solvent is 70-80°C, and the drying temperature is 100-110°C.

6. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 1, characterized in that The preparation method of the stabilizer comprises the following steps: ① dissolving polymethacrylate-2-hydroxyethyl ester and methacryloyl chloride in tetrahydrofuran according to the above mass fractions, stirring for 3-3.5 hours under a nitrogen environment, filtering, and drying to obtain a reaction monomer; ② dissolving the reaction monomer obtained in step ① and the 2-acrylamide-2-methylpropanesulfonic acid in deionized water, using a pH regulator, i.e., sodium hydroxide, to adjust the pH value of the solution to 7-9, raising the solution temperature to 35-60° C., adding a crosslinking agent, and stirring for 0.5-1 hour under a nitrogen environment to obtain a solution; ③ adding an initiator to the solution obtained in step ②, stirring, reacting at a constant temperature for 4-6 hours, adjusting the temperature to 60-70° C., and keeping warm for 2-4 hours to obtain an intermediate solution; ④ drying the intermediate solution obtained in step ③, and crushing it to obtain the stabilizer powder; the initiator is 2 , one of 2-azobis(2-methylpropylimidazole) dihydrochloride, azobisimidazolinylpropane dihydrochloride and azobishydroxyethylimidazolinylpropane dihydrochloride.

7. The treating agent for recovering the performance of the recyclable drilling fluid according to claim 6, characterized in that In step ③, the stirring speed is 200-300 r / min; in step ④, the drying temperature is 100-110°C.

8. A processing system for recovering the properties of a recoverable drilling fluid, using the treating agent for recovering the properties of a recoverable drilling fluid according to any one of claims 1 to 7, the processing system comprising a mixer (1), characterized in that The top of the mixer (1) is connected to a liquid inlet pipe (2) for recoverable drilling fluid, and a first solenoid valve (3) with a flow meter is provided on the liquid inlet pipe (2). The liquid inlet pipe (2) is connected to the bottom of the activator solution storage (4), the bottom of the modifier solution storage (5), and the bottom of the stabilizer solution storage (6) through pipelines, respectively. A combination of a second solenoid valve (7) with a flow meter and a feed pump (8) is provided on each connecting pipeline between the liquid inlet pipe (2) and the activator solution storage (4), the modifier solution storage (5), and the stabilizer solution storage (6). The bottom of the mixer (1) is connected to a liquid outlet pipe (9), and a third solenoid valve (10) and a liquid outlet pump (11) are provided on the liquid outlet pipe (9). A stirring device is provided in the mixer (1).

9. The processing system for recovering drilling fluid properties according to claim 8, characterized in that The stirring device comprises a motor (12), a rotating rod (13) arranged vertically, a round shell (16), a driving gear (18), at least two driven gears (19) arranged horizontally, an inner gear ring (20), a plurality of connecting rods (22) corresponding one to one with the driven gears (19), a plurality of fourth bearings (21) corresponding one to one with the plurality of connecting rods (22), two horizontal rods (23), two vertical rods (24), a plurality of first stirring blades (25), and a plurality of second stirring blades (26); The motor (12) is located above the center of the top of the mixer (1). The rotating rod (13) passes through the top of the mixer (1) and is rotatably connected to the top of the mixer (1) via a first sealed bearing (14). The top protruding end of the rotating rod (13) is fixedly connected to the power output end of the motor (12). The bottom of the rotating rod (13) is rotatably connected to the bottom of the mixer (1) via a second sealed bearing (15). A round shell (16) is provided on the upper part of the rotating rod (13) in the mixer (1). The rotating rod (13) passes through the middle of the circular shell (16), and the rotating rod (13) is rotatably connected to the top and bottom of the circular shell (16) through a third sealed bearing (17). A transversely arranged driving gear (18) is fixedly mounted on the portion of the rotating rod (13) located inside the circular shell (16), and the driving gear (18) is meshed with all the driven gears (19), and each of the driven gears (19) is meshed with an inner gear ring (20) arranged on the inner side wall of the circular shell (16).

10. The processing system for recovering drilling fluid properties according to claim 9, characterized in that The center of the bottom end of each driven gear (19) is rotatably connected to the top of a corresponding vertically arranged connecting rod (22) through a fourth bearing (21); the bottom of the connecting rod (22) is fixedly connected to the inner wall of the bottom end of the circular shell (16); two cross bars (23) are symmetrically arranged on the outer side of the circular shell (16); one end of each cross bar (23) is fixedly connected to the outer side wall of the circular shell (16); the other end of each cross bar (23) is fixedly connected to the top of a corresponding vertical rod (24); a portion of the rotating rod (13) located below the circular shell (16) is provided with a plurality of first stirring blades (25) from top to bottom; each vertical rod (24) is provided with a plurality of second stirring blades (26) from top to bottom; and the plurality of first stirring blades (25) and the plurality of second stirring blades (26) are arranged alternately at intervals.

11. The processing system for recovering drilling fluid properties according to claim 8, characterized in that The invention also comprises an activator powder storage container (27), a modifier powder storage container (28), a stabilizer powder storage container (29), three pairs of support rods (32), three weighing modules (33) and three pipes (39). The top of the activator solution storage container (4), the top of the modifier solution storage container (5) and the top of the stabilizer solution storage container (6) are each installed with a pair of support rods (32). The top of the activator solution storage container (4), the top of the modifier solution storage container (5) and the top of the stabilizer solution storage container (6) are each connected to the bottom of the activator powder storage container (27), the modifier powder storage container (28) and the stabilizer solution storage container (6) via a corresponding pipe (39). The bottom of the activator solution storage device (4), the bottom of the stabilizer powder storage device (29) are connected, each of the pipelines (39) is provided with a fourth electromagnetic valve (30) and a powder pump (31), and a weighing module (33) is provided between the two side legs of the activator powder storage device (27), the two side legs of the modifier powder storage device (28), and the two side legs of the stabilizer powder storage device (29) and the top of the corresponding pair of support rods (32). The top of the activator solution storage device (4), the top of the modifier solution storage device (5), and the top of the stabilizer solution storage device (6) are each connected to a water inlet pipe (34), and each of the water inlet pipes (34) is provided with a fifth electromagnetic valve (35) with a flow meter.

12. The processing system for recoverable drilling fluid performance recovery according to claim 11, characterized in that The upper end opening of the activator powder storage container (27), the upper end opening of the modifier powder storage container (28), and the upper end opening of the stabilizer powder storage container (29) are each provided with a cover plate (36), one side of each cover plate (36) is hinged to one side of the corresponding upper end opening, and each cover plate (36) is provided with a handle (37); The top inner wall of the activator solution storage (4), the top inner wall of the modifier solution storage (5), and the top inner wall of the stabilizer solution storage (6) are each provided with a liquid level sensor (38), and the inner outer wall of the activator solution storage (4), the inner outer wall of the modifier solution storage (5), and the inner outer wall of the stabilizer solution storage (6) are each provided with an oscillator (40).

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