Integrated treatment method for restoring performance of waste drilling fluid

Abstract

The application discloses a kind of waste drilling fluid performance recovery integrated processing method, is mixed into the activator, modifier, stabilizer and is stirred uniformly in the recyclable waste drilling fluid to be handled, so that its performance recovers and is reused.Activator raw materials: polyethylene polyamine, monobromo fatty acid, monobromo alkane sulfonic acid sodium, deionized water and ethylenediaminetetraacetic acid disodium, etc.Modifier raw materials: sodium styrene sulfonate, 2-acrylamido-2-methylpropane sulfonic acid, maleimide, 2-(allyl sulfonyl)-6-methyl pyridine, chain transfer agent, initiator and deionized water, etc.Stabilizer raw materials: polyethylene glycol, maleic anhydride, 2-acrylamido-2-methylpropane sulfonic acid, [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, N-vinyl pyrrolidone, initiator, catalyst and deionized water, etc.The application has good processing effect, realizes the reuse of high-value recyclable waste drilling fluid, reduces processing cost, and improves processing efficiency.

Description

Technical Field

[0001] This invention relates to a method for treating recyclable waste drilling fluid, and more particularly to an integrated method for restoring the performance of waste drilling fluid, belonging to the technical field of resource utilization and reuse of recyclable waste water-based drilling fluid. Background Technology

[0002] Drilling fluid, as a core material in oil drilling operations, plays a crucial role in suspending cuttings, balancing formation pressure, cooling and lubricating drill bits and tools, and cleaning the wellbore, directly impacting the safety and efficiency of drilling operations. However, recyclable drilling fluids often deteriorate in performance during use due to factors such as drill cuttings contamination, chemical degradation, and formation fluid intrusion, making direct recycling impossible. Direct disposal requires solid-liquid separation and harmless pretreatment, leading to high costs in oil and gas exploration and development. Therefore, developing technologies for the performance restoration and reuse of recyclable waste drilling fluids to achieve resource recovery and utilization has become an urgent need for the green and low-carbon development of the oil drilling industry.

[0003] Relevant patent document: CN103015927A discloses a method for optimizing and reusing waste drilling fluid, including the step of maintaining and storing waste drilling fluid. The method involves preparing 0.1-0.3% bactericide, 0.1-0.2% oxygen scavenger, 0.1-0.2% alkalinity control agent, and 0.05-0.2% dispersant, based on the mass percentage of the waste drilling fluid, for later use. Under normal temperature and pressure, the following procedure is followed: every four days, add the bactericide in the above proportions to the waste drilling fluid and perform a total bacterial count test using 3M test strips; every five days, add the oxygen scavenger in the above proportions to the waste drilling fluid; every seven days, add the alkalinity control agent in the above proportions to the waste drilling fluid and measure the pH value of the waste drilling fluid to maintain it between 10 and 11; every seven days, add the dispersant in the above proportions to the waste drilling fluid. This method is particularly suitable for horizontal well drilling operations, greatly alleviating environmental pressure and reducing drilling fluid costs. It solves the problem of effectively removing micron- and submicron-sized solid phases from drilling fluids, a problem present in existing technologies. CN119264881A discloses a treatment agent and system for restoring the performance of recyclable drilling fluid. The treatment agent includes an activator, a modifier, and a stabilizer for restoring the performance of recyclable drilling fluid. The system includes a mixer connected to the inlet pipe of the recyclable drilling fluid. The inlet pipe is connected to the activator solution storage, modifier solution storage, and stabilizer solution storage via pipelines. The mixer is equipped with a stirring device to mix the activator, modifier, and stabilizer into the recyclable drilling fluid to be treated and stir evenly. The mixer uses a stirring device with counter-rotating internal and external rotation. This technical solution requires dedicated processing equipment (processing system), has generally low processing efficiency, increases processing costs, and is difficult to scale up for industrial production.

[0004] In summary, existing technologies still have their limitations and have failed to comprehensively and efficiently solve the core problems of performance restoration and large-scale reuse of recyclable waste water-based drilling fluids. There is an urgent need for an integrated treatment method that is highly efficient, low-cost, and does not require complex specialized equipment. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated treatment method for the performance restoration of waste drilling fluid. This method can achieve efficient performance restoration and reuse of recyclable waste drilling fluid, with stable and reliable treatment results. At the same time, it can reduce treatment costs and improve treatment efficiency, thereby solving the problem that recyclable waste water-based drilling fluid is difficult to reuse.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] An integrated treatment method for restoring the performance of waste drilling fluid involves mixing activator, modifier, and stabilizer into the recyclable waste drilling fluid to be treated according to a mass ratio, stirring evenly, so that the performance of the recyclable waste drilling fluid can be restored and reused.

[0008] The activator is prepared from the following raw materials in the following mass ratio (parts by mass): 15-25 parts polyethylene polyamine, 8-15 parts monobromo fatty acid, 28-35 parts sodium monobromoalkane sulfonate, 120-150 parts deionized water, 1-5 parts disodium ethylenediaminetetraacetate, and pH adjuster (alkaline pH adjuster).

[0009] The modifier is prepared from the following raw materials in the following mass ratio (parts by mass): 10-15 parts sodium styrene sulfonate, 25-35 parts 2-acrylamido-2-methylpropanesulfonic acid, 5-8 parts maleimide, 3-5 parts 2-(allylsulfonyl)-6-methylpyridine, 0.5-2 parts chain transfer agent, 0.01-0.3 parts initiator, 100-120 parts deionized water, and pH adjuster (alkaline pH adjuster).

[0010] The stabilizer is prepared from the following raw materials in the following mass ratio (parts by mass): 15-25 parts polyethylene glycol, 5-8 parts maleic anhydride, 10-15 parts 2-acrylamido-2-methylpropanesulfonic acid, 2-5 parts [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propane)ammonium hydroxide, 2-5 parts N-vinylpyrrolidone, 0.07-0.1 parts initiator, 0.25-0.35 parts catalyst, 100-150 parts deionized water, and pH adjuster (alkaline pH adjuster).

[0011] In the raw materials for preparing the activator, modifier, and stabilizer, the amount of pH adjuster should meet the requirements for achieving the required pH value of the solution after adjustment.

[0012] The integrated treatment method for restoring the performance of waste drilling fluid specifically involves placing the recyclable waste (water-based) drilling fluid to be treated into a container, and mixing the activator, modifier, and stabilizer into the recyclable waste (water-based) drilling fluid according to the mass ratio, stirring evenly. The amount of activator added is 0.05%~0.1% of the mass of the recyclable waste drilling fluid to be treated, the amount of modifier added is 0.015%~0.04% of the mass of the recyclable waste drilling fluid to be treated, and the amount of stabilizer added is 0.025%~0.07% of the mass of the recyclable waste drilling fluid to be treated. When adding the recyclable waste drilling fluid, the concentration of the activator is 7~10 g / L (solvent is water), the concentration of the modifier is 10~15 g / L (solvent is water), and the concentration of the stabilizer is 2.5~5 g / L (solvent is water).

[0013] In the above technical solution, a preferred technical solution may also be that, in the raw materials for preparing the activator, the polyethylene polyamine is one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; the monobromo fatty acid is one of 3-bromopropionic acid, 2-bromobutyric acid, and 2-bromopentanoic acid; and the monobromoalkane sulfonate is one of 3-bromopropane sulfonate, 2-bromoethane sulfonate (2-bromoethyl sulfonate), and bromohexane sulfonate.

[0014] In the above technical solution, a preferred technical solution may also be that, in the raw materials for preparing the modifier, the chain transfer agent is 2-(dodecyltrithiocarbonate)-2-methylpropionic acid; and the initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride.

[0015] In the above technical solution, a preferred embodiment may also be that, in the raw materials for preparing the stabilizer, the polyethylene glycol has a molecular weight of 18,000 to 20,000; the initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethyl)imidazolinylpropane dihydrochloride; and the catalyst is p-toluenesulfonic acid (p-methylbenzenesulfonic acid). In the raw materials for preparing the activator, modifier, and stabilizer, the pH adjuster is a 10% (w / w) aqueous solution of sodium hydroxide.

[0016] In the above technical solution, a preferred technical solution may also be that the preparation method of the activator includes the following steps: (1) dissolving polyethylene polyamine and monobromo fatty acid in deionized water according to the mass ratio, and stirring at a constant temperature of 65~80℃ for 3~5h to obtain a first solution; (2) adding a pH adjuster, namely a 10% sodium hydroxide aqueous solution, to the first solution obtained in step (1) to adjust the pH value of the first solution to 9~10 to obtain a second solution; (3) adding a 10% sodium hydroxide aqueous solution to the second solution obtained in step (2) according to the mass ratio. Add sodium monobromoalkane sulfonate in the specified proportion and stir at a constant temperature of 40-55℃ for 5-7 hours to obtain the third solution; (4) Add a pH adjuster, namely a 10% sodium hydroxide aqueous solution, to the third solution obtained in step (3) to adjust the pH value of the third solution to 8-10 to obtain the fourth solution; (5) Add disodium ethylenediaminetetraacetate in the fourth solution obtained in step (4) in the specified proportion and stir to dissolve (dissolve disodium ethylenediaminetetraacetate), and dry at 100-110℃ to constant weight to obtain the activator.

[0017] In the above technical solution, the preferred technical solution may also be that the preparation method of the modifier includes the following steps: (1) Sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, maleimide, 2-(allylsulfonyl)-6-methylpyridine and chain transfer agent are dissolved in deionized water according to the mass ratio, stirred and dissolved to obtain solution A, and the pH value of solution A is adjusted to 7~9 using pH value adjuster, i.e., sodium hydroxide aqueous solution with a mass fraction of 10%, and the temperature of solution A is raised to 40~55℃, and stirred in a nitrogen atmosphere for 0.5~1h to obtain solution B; (2) Initiator is added to solution B obtained in step (1) according to the mass ratio, stirred, and reacted at a constant temperature of 50~60℃ for 4~6h, and then the temperature is adjusted to 70~80℃ and kept warm for 2~4h to obtain solution C; (3) Solution C obtained in step (2) is dried at a temperature of 100~110℃ to constant weight to obtain the modifier.

[0018] In the above technical solution, a preferred technical solution may also be that the preparation method of the stabilizer includes the following steps: ① Maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, and N-vinylpyrrolidone are dissolved in deionized water according to the mass ratio to obtain solution D. The pH value of solution D is adjusted to 4-5 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is then raised to 45°C. ① Stir at 60℃ in a nitrogen atmosphere for 0.5-1h to obtain solution E; ② Add initiator to solution E obtained in step ① according to the mass ratio, stir, and react at a constant temperature of 50-60℃ for 5-7h, then raise the temperature to 70-80℃ and keep it at that temperature for 2-4h to obtain solution F; ③ Add polyethylene glycol to solution F obtained in step ② according to the mass ratio, stir evenly, adjust the temperature to 80-95℃, add catalyst according to the mass ratio, and react at a constant temperature of 80-95℃ for 5-7h to obtain solution G. Use a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution, to adjust the pH of solution G to 8-9 to obtain solution H; ④ Dry solution H obtained in step ③ at 100-110℃ to constant weight to obtain the stabilizer.

[0019] In the above technical solutions, a preferred technical solution is that, in step (2) of the method for preparing the modifier, the stirring speed is 200~300 r / min. In step ② of the method for preparing the stabilizer, the stirring speed is 150~250 r / min.

[0020] Referring to Table 1 at the end of this specification, the performance of recyclable waste drilling fluid is restored after treatment by the integrated treatment method of this invention. Specifically, the apparent viscosity, plastic viscosity, static shear force, flow index, and high-temperature and high-pressure filtration loss (150°C) of the treated recyclable waste drilling fluid all show a significant decreasing trend; while the dynamic-plastic ratio (dynamic shear force / plastic viscosity) increases from 0.18 to 0.36-0.39, effectively improving the drilling fluid's suspension and rock-carrying capacity and wellbore cleaning ability. All performance parameters have been restored to the required range for drilling operations, realizing the resource-based recycling of recyclable waste water-based drilling fluid (specifically, achieving precise restoration and recycling of the core performance of the drilling fluid), significantly reducing the comprehensive cost of on-site preparation and waste treatment of drilling fluid during oil and gas exploration and development (significantly reducing the treatment cost of waste drilling fluid and drilling cost), and providing an efficient and feasible technical solution for the green and low-carbon development of the oil drilling industry.

[0021] Compared to the recyclable drilling fluid performance restoration treatment agent and system disclosed in CN119264881A (reference document 1), the processing procedure of this invention is simple. It only requires placing the recyclable waste drilling fluid to be treated into a container, and then mixing the activator, modifier, and stabilizer into the recyclable waste drilling fluid and stirring evenly. This invention (integrated treatment method) as a treatment system has strong synergy and significant performance restoration effect, achieving efficient recycling of high-value recyclable waste water-based drilling fluid. In contrast, reference document 1 requires dedicated treatment equipment (treatment system), has generally lower treatment efficiency, increases treatment costs, and is difficult to scale up for industrial production. Experiments show that, compared to reference document 1, under the same experimental conditions, this invention reduces the treatment cost of recyclable waste drilling fluid by more than 13% and increases the treatment efficiency of recyclable waste drilling fluid by more than 15%.

[0022] In summary, this invention provides an integrated treatment method for the performance restoration of waste drilling fluid, achieving the goal of efficient performance restoration and reuse of recyclable waste drilling fluid. The treatment effect is stable and reliable (good treatment effect), while reducing treatment costs and improving treatment efficiency. It solves the problem of the difficulty in reusing recyclable waste water-based drilling fluid and has good prospects for industrial application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of this invention.

[0024] Example 1: The integrated treatment method for restoring the performance of waste drilling fluid of the present invention involves mixing activator, modifier, and stabilizer into the recyclable waste drilling fluid to be treated according to the mass ratio, stirring evenly, so that the performance of the recyclable waste drilling fluid can be restored and reused.

[0025] The activator is prepared from the following raw materials in the indicated mass ratios: 20 parts polyethylene polyamine, 10 parts monobromo fatty acid, 28 parts sodium monobromoalkane sulfonate, 125 parts deionized water, 4 parts disodium ethylenediaminetetraacetate, and a pH adjuster.

[0026] The modifier is prepared from the following raw materials in the indicated mass ratios: 12 parts sodium styrene sulfonate, 30 parts 2-acrylamido-2-methylpropanesulfonic acid, 6 parts maleimide, 3 parts 2-(allylsulfonyl)-6-methylpyridine, 1 part chain transfer agent, 0.06 parts initiator, 120 parts deionized water, and pH adjuster.

[0027] The stabilizer is prepared from the following raw materials in the indicated mass ratios: 15 parts polyethylene glycol, 6 parts maleic anhydride, 12 parts 2-acrylamido-2-methylpropanesulfonic acid, 2 parts [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide, 4 parts N-vinylpyrrolidone, 0.08 parts initiator, 0.25 parts catalyst, 110 parts deionized water, and pH adjuster.

[0028] In the raw materials for preparing the activator, modifier, and stabilizer, the amount of pH adjuster should meet the requirements for achieving the pH value of the solution after adjustment. The pH adjuster is a 10% sodium hydroxide aqueous solution.

[0029] This invention restores the properties of recyclable waste drilling fluid, enabling its reuse, by adding the aforementioned activator, modifier, and stabilizer to the recyclable waste drilling fluid after harmful solid phases have been removed. Specifically, the activator enhances the activation of clay and reduces the presence of free water; the modifier improves the rheological stability of the drilling mud, reduces filtration loss, and enhances temperature resistance; and the stabilizer limits performance fluctuations in the reused waste drilling fluid during long-term storage.

[0030] The integrated processing method of the present invention specifically involves placing the recyclable waste drilling fluid to be treated into a container, mixing the activator, modifier, and stabilizer into the recyclable waste drilling fluid, and stirring evenly. The amount of activator added is 0.07% of the mass of the recyclable waste drilling fluid to be treated, the amount of modifier added is 0.025% of the mass of the recyclable waste drilling fluid to be treated, and the amount of stabilizer added is 0.05% of the mass of the recyclable waste drilling fluid to be treated. When adding the recyclable waste drilling fluid, the concentration of the activator is 10 g / L (solvent is water), the concentration of the modifier is 10 g / L (solvent is water), and the concentration of the stabilizer is 2.5 g / L (solvent is water).

[0031] The preparation method of the activator includes the following steps: (1) Dissolve polyethylene polyamine and monobromo fatty acid in deionized water according to the mass ratio, and stir at 70°C for 5 hours to obtain the first solution; (2) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step (1) to adjust the pH value of the first solution to 9, and obtain the second solution; (3) Add sodium monobromoalkane sulfonate according to the mass ratio to the second solution obtained in step (2), and stir at 45°C for 7 hours to obtain the third solution; (4) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the third solution obtained in step (3) to adjust the pH value of the third solution to 8, and obtain the fourth solution; (5) Add disodium ethylenediaminetetraacetate according to the mass ratio to the fourth solution obtained in step (4) and stir to dissolve (dissolve disodium ethylenediaminetetraacetate), and dry at 105°C to constant weight to obtain the activator. The polyethylene polyamine is one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; in this embodiment, triethylenetetramine is selected. The monobromo fatty acid is one of 3-bromopropionic acid, 2-bromobutyric acid, and 2-bromopentanoic acid; in this embodiment, 3-bromopropionic acid is selected. The sodium monobromoalkane sulfonate is one of sodium 3-bromopropane sulfonate, sodium 2-bromoethane sulfonate (2-bromoethyl sulfonate), and sodium bromohexane sulfonate; in this embodiment, sodium 3-bromopropane sulfonate is selected.

[0032] The preparation method of the modifier includes the following steps: (1) Sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, maleimide, 2-(allylsulfonyl)-6-methylpyridine, and chain transfer agent are dissolved in deionized water according to the mass ratio, stirred and dissolved to obtain solution A. The pH value of solution A is adjusted to 9 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution A is raised to 45°C and stirred in a nitrogen atmosphere for 0.5 h to obtain solution B; (2) An initiator is added to solution B obtained in step (1) according to the mass ratio, stirred at a stirring speed of 200 r / min, reacted at a constant temperature of 50°C for 4 h, and then the temperature is adjusted to 70°C and kept at that temperature for 3 h to obtain solution C; (3) Solution C obtained in step (2) is dried at 110°C to constant weight to obtain the modifier. The chain transfer agent is 2-(dodecyltrithiocarbonate)-2-methylpropionic acid. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride. In this embodiment, 2,2-azobis(2-methylpropylimidazolium) hydrochloride is selected as the initiator.

[0033] The method for preparing the stabilizer includes the following steps: ① Maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, and N-vinylpyrrolidone are dissolved in deionized water according to the mass ratio to obtain solution D. The pH value of solution D is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 60℃, and the solution is stirred for 0.5h in a nitrogen atmosphere to obtain solution E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred at a stirring speed of 250r / min. The mixture is reacted at a constant temperature of 60℃ for 6h, and then the temperature is increased to 75℃ and kept at that temperature for 4h to obtain solution F; ③ Polyethylene glycol is added to solution F obtained in step ② according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 80℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 80℃ for 5h to obtain solution G. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 60℃, and the solution is stirred for 4h in a nitrogen atmosphere to obtain solution E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 80℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 80℃ for 5h to obtain solution G. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a 1 The pH of solution G is adjusted to 8 using a 10% sodium hydroxide aqueous solution to obtain solution H; ④ Solution H obtained in step ③ is dried at 110°C to constant weight to obtain the stabilizer. The molecular weight of the polyethylene glycol is 20000. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) dihydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethyl)imidazolinylpropane dihydrochloride; in this embodiment, azobisimidazolinylpropane dihydrochloride is selected as the initiator. The catalyst is p-toluenesulfonic acid.

[0034] Example 2: The integrated treatment method for restoring the performance of waste drilling fluid of the present invention involves mixing activator, modifier, and stabilizer into the recyclable waste drilling fluid to be treated according to the mass ratio, stirring evenly, so that the performance of the recyclable waste drilling fluid can be restored and reused.

[0035] The activator is prepared from the following raw materials in the indicated mass ratios: 25 parts polyethylene polyamine, 12 parts monobromo fatty acid, 30 parts sodium monobromoalkane sulfonate, 150 parts deionized water, 3 parts disodium ethylenediaminetetraacetate, and a pH adjuster.

[0036] The modifier is prepared from the following raw materials in the indicated mass ratios: 15 parts sodium styrene sulfonate, 35 parts 2-acrylamido-2-methylpropanesulfonic acid, 8 parts maleimide, 5 parts 2-(allylsulfonyl)-6-methylpyridine, 1.5 parts chain transfer agent, 0.1 parts initiator, 100 parts deionized water, and pH adjuster.

[0037] The stabilizer is prepared from the following raw materials in the indicated mass ratios: 20 parts polyethylene glycol, 8 parts maleic anhydride, 10 parts 2-acrylamido-2-methylpropanesulfonic acid, 3 parts [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propane)ammonium hydroxide, 5 parts N-vinylpyrrolidone, 0.1 parts initiator, 0.3 parts catalyst, 150 parts deionized water, and pH adjuster.

[0038] In the raw materials for preparing the activator, modifier, and stabilizer, the amount of pH adjuster should meet the requirements for achieving the pH value of the solution after adjustment. The pH adjuster is a 10% sodium hydroxide aqueous solution.

[0039] The integrated processing method of the present invention specifically involves placing the recyclable waste drilling fluid to be treated into a container, mixing the activator, modifier, and stabilizer into the recyclable waste drilling fluid, and stirring evenly. The amount of activator added is 0.1% of the mass of the recyclable waste drilling fluid to be treated, the amount of modifier added is 0.03% of the mass of the recyclable waste drilling fluid to be treated, and the amount of stabilizer added is 0.06% of the mass of the recyclable waste drilling fluid to be treated. When adding the recyclable waste drilling fluid, the concentration of the activator is 8 g / L (solvent is water), the concentration of the modifier is 15 g / L (solvent is water), and the concentration of the stabilizer is 4 g / L (solvent is water).

[0040] The preparation method of the activator includes the following steps: (1) Dissolve polyethylene polyamine and monobromo fatty acid in deionized water according to the mass ratio, and stir at 75°C for 4 hours to obtain the first solution; (2) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step (1) to adjust the pH value of the first solution to 10 to obtain the second solution; (3) Add sodium monobromoalkane sulfonate according to the mass ratio to the second solution obtained in step (2), and stir at 55°C for 5 hours to obtain the third solution; (4) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the third solution obtained in step (3) to adjust the pH value of the third solution to 8 to obtain the fourth solution; (5) Add disodium ethylenediaminetetraacetate according to the mass ratio to the fourth solution obtained in step (4) and stir to dissolve (dissolve disodium ethylenediaminetetraacetate), and dry at 110°C to constant weight to obtain the activator. The polyethylene polyamine is one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; in this embodiment, diethylenetriamine is selected. The monobromo fatty acid is one of 3-bromopropionic acid, 2-bromobutyric acid, and 2-bromopentanoic acid; in this embodiment, 2-bromobutyric acid is selected. The sodium monobromoalkane sulfonate is one of sodium 3-bromopropane sulfonate, sodium 2-bromoethane sulfonate (2-bromoethyl sulfonate), and sodium bromohexane sulfonate; in this embodiment, sodium bromohexane sulfonate is selected.

[0041] The preparation method of the modifier includes the following steps: (1) Sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, maleimide, 2-(allylsulfonyl)-6-methylpyridine, and chain transfer agent are dissolved in deionized water according to the mass ratio, stirred and dissolved to obtain solution A. The pH value of solution A is adjusted to 8 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution A is raised to 50°C and stirred for 1 hour in a nitrogen atmosphere to obtain solution B; (2) An initiator is added to solution B obtained in step (1) according to the mass ratio, stirred at a stirring speed of 250 r / min, and reacted at a constant temperature of 55°C for 5 hours. Then the temperature is adjusted to 80°C and kept at that temperature for 4 hours to obtain solution C; (3) Solution C obtained in step (2) is dried at 105°C to constant weight to obtain the modifier. The chain transfer agent is 2-(dodecyltrithiocarbonate)-2-methylpropionic acid. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) dihydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride. In this embodiment, azobisimidazolinylpropane dihydrochloride is selected as the initiator.

[0042] The method for preparing the stabilizer includes the following steps: ① Maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, and N-vinylpyrrolidone are dissolved in deionized water according to the mass ratio to obtain solution D. The pH value of solution D is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 50℃, and the solution is stirred for 0.5h in a nitrogen atmosphere to obtain solution E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred at a stirring speed of 200r / min. The mixture is reacted at a constant temperature of 55℃ for 7h, and then the temperature is increased to 75℃ and kept at that temperature for 4h to obtain solution F; ③ Polyethylene glycol is added to solution F obtained in step ② according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 90℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 90℃ for 7h to obtain solution G. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 50℃, and the solution is stirred for 0.5h in a nitrogen atmosphere to obtain solution E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 90℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 90℃ for 7h to obtain solution G. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The pH value of solution G is adjusted to 4 using a pH adjuster, i.e., a The pH of solution G is adjusted to 8 using a 10% sodium hydroxide aqueous solution to obtain solution H; ④ Solution H obtained in step ③ is dried at 105°C to constant weight to obtain the stabilizer. The molecular weight of the polyethylene glycol is 18000. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) dihydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethyl)imidazolinylpropane dihydrochloride. In this embodiment, azobis(hydroxyethyl)imidazolinylpropane dihydrochloride is selected as the initiator. The catalyst is p-toluenesulfonic acid.

[0043] Example 3: The integrated treatment method for restoring the performance of waste drilling fluid of the present invention involves mixing activator, modifier, and stabilizer into the recyclable waste drilling fluid to be treated according to the mass ratio, stirring evenly, so that the performance of the recyclable waste drilling fluid can be restored and reused.

[0044] The activator is prepared from the following raw materials in the indicated mass ratios: 18 parts polyethylene polyamine, 15 parts monobromo fatty acid, 32 parts sodium monobromoalkane sulfonate, 120 parts deionized water, 2 parts disodium ethylenediaminetetraacetate, and a pH adjuster.

[0045] The modifier is prepared from the following raw materials in the indicated mass ratios: 15 parts sodium styrene sulfonate, 32 parts 2-acrylamido-2-methylpropanesulfonic acid, 5 parts maleimide, 4 parts 2-(allylsulfonyl)-6-methylpyridine, 1 part chain transfer agent, 0.3 parts initiator, 120 parts deionized water, and pH adjuster.

[0046] The stabilizer is prepared from the following raw materials in the indicated mass ratios: 23 parts polyethylene glycol, 5 parts maleic anhydride, 15 parts 2-acrylamido-2-methylpropanesulfonic acid, 5 parts [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide, 2 parts N-vinylpyrrolidone, 0.08 parts initiator, 0.25 parts catalyst, 140 parts deionized water, and pH adjuster.

[0047] In the raw materials for preparing the activator, modifier, and stabilizer, the amount of pH adjuster should meet the requirements for achieving the pH value of the solution after adjustment. The pH adjuster is a 10% sodium hydroxide aqueous solution.

[0048] The integrated processing method of the present invention specifically involves placing the recyclable waste drilling fluid to be treated into a container, mixing the activator, modifier, and stabilizer into the recyclable waste drilling fluid, and stirring evenly. The amount of activator added is 0.08% of the mass of the recyclable waste drilling fluid to be treated, the amount of modifier added is 0.02% of the mass of the recyclable waste drilling fluid to be treated, and the amount of stabilizer added is 0.04% of the mass of the recyclable waste drilling fluid to be treated. When adding the recyclable waste drilling fluid, the concentration of the activator is 7 g / L (solvent is water), the concentration of the modifier is 13 g / L (solvent is water), and the concentration of the stabilizer is 4 g / L (solvent is water).

[0049] The preparation method of the activator includes the following steps: (1) Dissolve polyethylene polyamine and monobromo fatty acid in deionized water according to the mass ratio, and stir at 80°C for 4 hours to obtain the first solution; (2) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the first solution obtained in step (1) to adjust the pH value of the first solution to 10 to obtain the second solution; (3) Add sodium monobromoalkane sulfonate according to the mass ratio to the second solution obtained in step (2), and stir at 53°C for 6 hours to obtain the third solution; (4) Add a pH adjuster, i.e., a sodium hydroxide aqueous solution with a mass fraction of 10%, to the third solution obtained in step (3) to adjust the pH value of the third solution to 10 to obtain the fourth solution; (5) Add disodium ethylenediaminetetraacetate according to the mass ratio to the fourth solution obtained in step (4) and stir to dissolve (dissolve disodium ethylenediaminetetraacetate), and dry at 100°C to constant weight to obtain the activator. The polyethylene polyamine is one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; in this embodiment, tetraethylenepentamine is selected. The monobromo fatty acid is one of 3-bromopropionic acid, 2-bromobutyric acid, and 2-bromopentanoic acid; in this embodiment, 2-bromopentanoic acid is selected. The sodium monobromoalkane sulfonate is one of sodium 3-bromopropane sulfonate, sodium 2-bromoethane sulfonate (2-bromoethyl sulfonate), and sodium bromohexane sulfonate; in this embodiment, sodium 2-bromoethane sulfonate is selected.

[0050] The preparation method of the modifier includes the following steps: (1) Sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, maleimide, 2-(allylsulfonyl)-6-methylpyridine, and chain transfer agent are dissolved in deionized water according to the mass ratio, stirred and dissolved to obtain solution A. The pH value of solution A is adjusted to 7 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution A is raised to 55°C and stirred in a nitrogen atmosphere for 0.5 h to obtain solution B; (2) An initiator is added to solution B obtained in step (1) according to the mass ratio, stirred at a stirring speed of 270 r / min, and reacted at a constant temperature of 55°C for 6 h. Then the temperature is adjusted to 80°C and kept at that temperature for 3 h to obtain solution C; (3) Solution C obtained in step (2) is dried at 105°C to constant weight to obtain the modifier. The chain transfer agent is 2-(dodecyltrithiocarbonate)-2-methylpropionic acid. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) dihydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride. In this embodiment, azobisimidazolinylpropane dihydrochloride is selected as the initiator.

[0051] The method for preparing the stabilizer includes the following steps: ① Maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, and N-vinylpyrrolidone are dissolved in deionized water according to the mass ratio to obtain solution D. The pH value of solution D is adjusted to 5 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 60℃, and the solution is stirred for 0.5h in a nitrogen atmosphere to obtain solution E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred at a stirring speed of 150r / min. The mixture is reacted at a constant temperature of 60℃ for 5h, and then the temperature is increased to 75℃ and kept at that temperature for 3h to obtain solution F; ③ Polyethylene glycol is added to solution F obtained in step ② according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 85℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 85℃ for 6h to obtain solution G. The pH value of solution G is adjusted to 5 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution D is increased to 60℃, and the solution is stirred for 0h in a nitrogen atmosphere ... E; ② An initiator is added to solution E obtained in step ① according to the mass ratio, and the mixture is stirred evenly. The temperature is adjusted to 85℃, and a catalyst is added according to the mass ratio. The mixture is reacted at a constant temperature of 85℃ for 6 The pH of solution G is adjusted to 9 using a 10% sodium hydroxide aqueous solution to obtain solution H; ④ Solution H obtained in step ③ is dried at 110°C to constant weight to obtain the stabilizer. The molecular weight of the polyethylene glycol is 20000. The initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethyl)imidazolinylpropane dihydrochloride. In this embodiment, 2,2-azobis(2-methylpropylimidazolium) hydrochloride is selected as the initiator. The catalyst is p-toluenesulfonic acid.

[0052] The recyclable waste drilling fluid used in the experiment of this invention (integrated treatment method) was from the same batch. Its initial performance was tested and recorded. Then, the recyclable waste drilling fluid was treated using Examples 1, 2, and 3 of this invention, and the performance of the recyclable waste drilling fluid after treatment by this invention was tested. The test results are shown in Table 1.

[0053] Table 1. Performance data of recyclable waste drilling fluid before and after treatment according to the present invention.

[0054]

[0055] As shown in Table 1, after treatment using the above-described Examples 1, 2, and 3 of the present invention (integrated treatment method), the core performance parameters of the recyclable waste (water-based) drilling fluid were precisely optimized: apparent viscosity, plastic viscosity, static shear force, flow index, and high-temperature, high-pressure filtration loss (150℃) all showed a significant decreasing trend; while the dynamic-plastic ratio (dynamic shear force / plastic viscosity) increased from 0.18 to 0.36-0.39, effectively improving the drilling fluid's suspension and rock-carrying capacity and wellbore cleaning ability. All performance parameters were restored to the required range for drilling operations, realizing the resource-based recycling of recyclable waste water-based drilling fluid (specifically, achieving precise restoration and recycling of the core performance of the drilling fluid), significantly reducing the comprehensive cost of on-site preparation and waste treatment of drilling fluid during oil and gas exploration and development (significantly reducing the treatment cost of waste drilling fluid and drilling costs), and providing an efficient and feasible technical solution for the green and low-carbon development of the oil drilling industry.

[0056] Compared to the recyclable drilling fluid performance restoration treatment agent and system disclosed in CN119264881A (reference document 1), the processing procedure of this invention is simpler. It only requires placing the recyclable waste drilling fluid to be treated into a container, mixing the activator, modifier, and stabilizer into the fluid, and stirring thoroughly. Reference document 1, however, requires specialized processing equipment (processing system), has lower processing efficiency, increases processing costs, and is difficult to scale up for industrial production. By mixing the activator, modifier, and stabilizer described in this invention into the recyclable waste drilling fluid, the activator, modifier, and stabilizer work synergistically, resulting in the aforementioned superior technical effects. Experiments show that, compared to reference document 1, under the same experimental conditions, this invention reduces the processing cost of recyclable waste drilling fluid by more than 13% and increases the processing efficiency by more than 15%.

[0057] In summary, the above embodiments of the present invention provide an integrated treatment method for the performance restoration of waste drilling fluid, which achieves the goal of efficient performance restoration and reuse of recyclable waste drilling fluid. The treatment effect is stable and reliable (good treatment effect), while reducing treatment costs and improving treatment efficiency. It solves the problem that recyclable waste water-based drilling fluid is difficult to reuse and has good prospects for industrial application.

Claims

1. A method for integrated treatment of waste drilling fluid performance restoration, characterized in that, The process involves mixing activators, modifiers, and stabilizers into the recyclable waste drilling fluid to be treated according to the specified mass ratio, stirring thoroughly to restore the performance of the recyclable waste drilling fluid for reuse. The activator is prepared from the following raw materials in the following mass ratio: 15-25 parts polyethylene polyamine, 8-15 parts monobromo fatty acid, 28-35 parts sodium monobromoalkane sulfonate, 120-150 parts deionized water, 1-5 parts disodium ethylenediaminetetraacetate, and pH adjuster. The modifier is prepared from the following raw materials in the indicated mass ratios: 10-15 parts sodium styrene sulfonate, 25-35 parts 2-acrylamido-2-methylpropanesulfonic acid, 5-8 parts maleimide, 3-5 parts 2-(allylsulfonyl)-6-methylpyridine, 0.5-2 parts chain transfer agent, 0.01-0.3 parts initiator, 100-120 parts deionized water, and pH adjuster; The stabilizer is prepared from the following raw materials in the indicated mass ratios: 15-25 parts polyethylene glycol, 5-8 parts maleic anhydride, 10-15 parts 2-acrylamido-2-methylpropanesulfonic acid, 2-5 parts [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propane)ammonium hydroxide, 2-5 parts N-vinylpyrrolidone, 0.07-0.1 parts initiator, 0.25-0.35 parts catalyst, 100-150 parts deionized water, and pH adjuster; In the raw materials for preparing the activator, modifier, and stabilizer, the amount of pH adjuster should meet the requirements for achieving the pH value of the solution after adjustment. The activator is added at a rate of 0.05% to 0.1% of the mass of the recyclable waste drilling fluid to be treated; the modifier is added at a rate of 0.015% to 0.04% of the mass of the recyclable waste drilling fluid to be treated; and the stabilizer is added at a rate of 0.025% to 0.07% of the mass of the recyclable waste drilling fluid to be treated. When adding the recyclable waste drilling fluid, the concentration of the activator is 7 to 10 g / L, the concentration of the modifier is 10 to 15 g / L, and the concentration of the stabilizer is 2.5 to 5 g / L. The preparation method of the activator includes the following steps: ① Dissolve polyethylene polyamine and monobromo fatty acid in deionized water according to the mass ratio, and stir at a constant temperature of 65-80℃ for 3-5 hours to obtain a first solution; ② Add a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution, to the first solution obtained in step ① to adjust the pH value of the first solution to 9-10 to obtain a second solution; ③ Add sodium monobromoalkane sulfonate to the second solution obtained in step ② according to the mass ratio, and stir at a constant temperature of 40-55℃ for 5-7 hours to obtain a third solution; ④ Add a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution, to the third solution obtained in step ③ to adjust the pH value of the third solution to 8-10 to obtain a fourth solution; ⑤ Add disodium ethylenediaminetetraacetate to the fourth solution obtained in step ④ according to the mass ratio and stir to dissolve, and dry at 100-110℃ to constant weight to obtain the activator. The preparation method of the modifier includes the following steps: ① Sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, maleimide, 2-(allylsulfonyl)-6-methylpyridine, and chain transfer agent are dissolved in deionized water according to the mass ratio, stirred to dissolve, and solution A is obtained. The pH value of solution A is adjusted to 7-9 using a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution. The temperature of solution A is raised to 40-55℃, and stirred in a nitrogen atmosphere for 0.5-1h to obtain solution B; ② An initiator is added to solution B obtained in step ① according to the mass ratio, stirred, and reacted at a constant temperature of 50-60℃ for 4-6h. Then the temperature is adjusted to 70-80℃ and kept at that temperature for 2-4h to obtain solution C; ③ Solution C obtained in step ② is dried at 100-110℃ to constant weight to obtain the modifier. The method for preparing the stabilizer includes the following steps: ① Dissolve maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide, and N-vinylpyrrolidone in deionized water according to the mass ratio to obtain solution D. Adjust the pH of solution D using a 10% sodium hydroxide aqueous solution. ① Adjust the pH value of solution D to 4-5, raise the temperature of solution D to 45-60℃, and stir in a nitrogen atmosphere for 0.5-1h to obtain solution E; ② Add initiator to solution E obtained in step ① according to the mass ratio, stir, and react at a constant temperature of 50-60℃ for 5-7h, then raise the temperature to 70-80℃ and keep it at that temperature for 2-4h to obtain solution F; ③ Add polyethylene glycol to solution F obtained in step ② according to the mass ratio, stir evenly, adjust the temperature to 80-95℃, add catalyst according to the mass ratio, and react at a constant temperature of 80-95℃ for 5-7h to obtain solution G. Use a pH adjuster, i.e., a 10% sodium hydroxide aqueous solution, to adjust the pH value of solution G to 8-9 to obtain solution H; ④ Dry solution H obtained in step ③ at a temperature of 100-110℃ to constant weight to obtain the stabilizer.

2. The integrated treatment method for restoring the performance of waste drilling fluid according to claim 1, characterized in that... In the raw materials for preparing the activator, the polyethylene polyamine is one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; the monobromo fatty acid is one of 3-bromopropionic acid, 2-bromobutyric acid, and 2-bromopentanoic acid; and the monobromoalkane sulfonate is one of 3-bromopropane sulfonate, 2-bromoethane sulfonate, and bromohexane sulfonate.

3. The integrated treatment method for restoring the performance of waste drilling fluid according to claim 1, characterized in that... In the raw materials for preparing the modifier, the chain transfer agent is 2-(dodecyltrithiocarbonate)-2-methylpropionic acid; the initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride.

4. The integrated treatment method for restoring the performance of waste drilling fluid according to claim 1, characterized in that... In the raw materials for preparing the stabilizer, the polyethylene glycol has a molecular weight of 18,000 to 20,000; the initiator is one of 2,2-azobis(2-methylpropylimidazolium) hydrochloride, azobisimidazolinylpropane dihydrochloride, and azobis(hydroxyethylimidazolinylpropane) dihydrochloride; and the catalyst is p-toluenesulfonic acid.

5. The integrated treatment method for restoring the performance of waste drilling fluid according to claim 1, characterized in that... In step ② of the method for preparing the modifier, the stirring speed is 200~300 r / min.

6. The integrated treatment method for restoring the performance of waste drilling fluid according to claim 1, characterized in that... In step ② of the method for preparing the stabilizer, the stirring speed is 150~250 r / min.

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