CN-117342763-B - Gel breaker and preparation method thereof

Abstract

The invention belongs to the technical field of waste slurry treatment of oil and gas fields, and particularly relates to a gel breaker and a preparation method thereof. The gel breaker is used for treating waste drilling mud of an oil-gas field and is prepared from the following raw materials, by mass, 30% -45% of a gel breaking main agent, 15% -25% of a gel breaking auxiliary agent, 2% -3% of a catalyst, 5% -8% of a stabilizer, 3% -5% of an oxidant, 1% -1.5% of an adsorbent, 0.5% -1% of a pH regulator and the balance of water, wherein the catalyst is prepared by loading metallic palladium on a titanium dioxide carrier. The gel breaker provided by the invention has the advantages of high gel breaking speed, low cost and wide temperature range, and the preparation method is simple and suitable for large-scale production and application.

Inventors

• GAO SHUSHENG
• GAO TIAN
• ZHANG WENKE
• WU ZHAOPING
• WANG HAIXU

Assignees

• 陕西延长石油（集团）有限责任公司（延长油矿管理局）油气勘探公司
• 陕西绿色能源有限公司

Dates

Publication Date

20260512

Application Date

20231122

Claims (3)

1. 1. The breaker is characterized by being used for treating waste drilling mud of an oil-gas field, and is prepared from the following raw materials in percentage by mass: 30% -45% of a gel breaking main agent, 15% -25% of a gel breaking auxiliary agent, 2% -3% of a catalyst, 5% -8% of a stabilizer, 3% -5% of an oxidant, 1% -1.5% of an adsorbent, 0.5% -1% of a pH regulator and the balance of water; the gel breaking main agent is prepared by mixing, by mass, 20% -30% of ammonium persulfate, 10% -15% of sodium perborate and the balance of potassium monopersulfate; the gel breaking auxiliary agent is fatty alcohol polyoxyethylene ether; the catalyst is prepared by the following steps: At room temperature, ethanol is used as a solvent to prepare a mixed solution of glacial acetic acid and butyl titanate, palladium and silicon dioxide are added into the mixed solution, water is added after the mixed solution is stirred uniformly, the mixture is stirred continuously to obtain gel, and the gel is dried and ground and sintered for 3 to 3.5 hours at 500 to 550 ℃ to prepare the catalyst; the stabilizer is sodium aminotrimethylene phosphonate or ethylenediamine tetramethylene sodium salt; The oxidant is one of potassium permanganate, sodium hypochlorite and hydrogen peroxide; The adsorbent is one of quicklime, sodium bentonite and biomass, and the biomass is one of walnut shells, sawdust and corn stalks; The pH regulator is citric acid or sorbic acid.
2. 2. The breaker of claim 1, wherein the ethanol is absolute ethanol, the volume ratio of glacial acetic acid, butyl titanate, and absolute ethanol is 0.9-1:4-6:26; the dosage ratio of palladium to absolute ethyl alcohol is 1-3g to 26mL, and the mass ratio of palladium to silicon dioxide is 1:1; in the catalyst preparation step, the volume ratio of water to absolute ethyl alcohol is 3-5:26.
3. 3. A method of preparing a breaker of claim 1, comprising the steps of: the raw materials with the mass percentages of 30-45% of gel breaking main agent, 15-25% of gel breaking auxiliary agent, 2-3% of catalyst, 5-8% of stabilizer, 3-5% of oxidant, 1-1.5% of adsorbent, 0.5-1% of pH regulator and the balance of water are respectively weighed; adding water into a gel breaking main agent, mixing to prepare a mixture 1, wherein the mass fraction of the water in the mixture 1 is 12% -44%, adding a gel breaking auxiliary agent and a catalyst into the mixture 1 to prepare a mixture 2, sequentially adding a stabilizer and an adsorbent into the mixture 2, uniformly stirring, standing for 1-2h to prepare a mixture 3, sequentially adding a pH regulator, an oxidant and the rest water into the mixture 3, and uniformly mixing to obtain the gel breaking agent.

Description

Gel breaker and preparation method thereof Technical Field The invention belongs to the technical field of waste slurry treatment of oil and gas fields, and particularly relates to a gel breaker and a preparation method thereof. Background Drilling waste mud is one of the most common contaminants in hydrocarbon production. In order to achieve the aim of safe and rapid drilling, the types and the amounts of chemicals added in the drilling fluid are increasing, and the components are becoming complex. In addition, as the requirements of the drilling process on the mud are higher and higher, the mud system is more and more complex, and the formula is more and more diversified, so that the waste drilling mud is more and more complex in composition and more harmful to the ecological environment. After the drilling operation is completed, all the waste is almost completely discharged and accumulated in the waste mud storage pit, and finally the multiphase suspended waste drilling mud consisting of clay, weighting materials, various chemical treatment agents, sewage, dirty oil, drilling cuttings and the like is formed. If discharged directly without treatment, the environmental soil and water source are polluted. Through the enrichment of crops and plants, the life and health of human beings can be finally endangered. At present, the oil-gas field generally adopts a physical and chemical combined method to treat the drilling waste mud, and the core of the method is that the drilling waste mud is changed into three parts of rock debris, mud cakes and water through dilution, flocculation and separation. The treatment process includes washing and diluting solid matter in slurry, coagulating the waste slurry with composite efficient gel breaker and flocculant to destroy colloid stability, separating out water solution from the slurry, and vacuum adsorption to separate out water solution from the solid matter. However, the breaker used in the process is various, but the treatment effect is very common (the time required for reducing the viscosity of the slurry to 2 Pa.s after breaking is 1.5-2 h), the breaking speed is relatively slow, the requirement of on-site slurry treatment while generating is hardly met, and the slurry is easy to accumulate. Disclosure of Invention In order to solve the technical problems, the invention provides a gel breaker and a preparation method thereof, which are used for treating waste mud of gas field drilling, improve the gel breaking speed and help to relieve the problem of mud accumulation. The invention is realized by the following technical scheme. The invention provides a gel breaker for treating waste drilling mud of an oil-gas field, which is prepared from the following raw materials in percentage by mass: 30% -45% of a gel breaking main agent, 15% -25% of a gel breaking auxiliary agent, 2% -3% of a catalyst, 5% -8% of a stabilizer, 3% -5% of an oxidant, 1% -1.5% of an adsorbent, 0.5% -1% of a pH regulator and the balance of water; The catalyst is obtained by loading metal palladium on a titanium dioxide carrier. In a preferred embodiment of the invention, the catalyst is prepared by the steps of: preparing a mixed solution of glacial acetic acid and butyl titanate by taking absolute ethyl alcohol as a solvent at room temperature, adding palladium and silicon dioxide into the mixed solution, stirring uniformly, adding water, stirring continuously to obtain gel, drying and grinding the gel, and sintering at 500-550 ℃ for 3-3.5h to obtain the catalyst. In a preferred embodiment of the invention, the volume ratio of glacial acetic acid, butyl titanate and absolute ethyl alcohol in the mixed solution is 0.9-1:4-6:26; The dosage ratio of palladium to absolute ethyl alcohol is 1-3g:26mL, and the mass ratio of palladium to silicon dioxide powder is 1:1; The volume ratio of water to absolute ethyl alcohol is 3-5:26. In the preferred embodiment of the invention, the gel breaking main agent is prepared by mixing, by mass, 20% -30% of ammonium persulfate, 10% -15% of sodium perborate and the balance of potassium monopersulfate. In the preferred embodiment of the invention, the gel breaking auxiliary agent is fatty alcohol polyoxyethylene ether, and the fatty alcohol polyoxyethylene ether is prepared by mixing, by mass, 30% -35% of penetrating agent JFC, 540% -45% of AEO and 20% -30% of peregal O. In a preferred embodiment of the invention, the stabilizer is sodium aminotrimethylene phosphonate or sodium ethylenediamine tetramethylene phosphinate. In a preferred embodiment of the present invention, the oxidizing agent is one of potassium permanganate, sodium hypochlorite and hydrogen peroxide. In a preferred embodiment of the present invention, the adsorbent is one of quicklime, sodium bentonite and biomass, and the biomass is one of walnut shell, sawdust and corn stalks. In a preferred embodiment of the invention, the pH adjuster is citric acid or sorbic acid. The invention also provides a p