31results about How to "Meet the requirements of fracturing construction" patented technology

The invention discloses a high temperature resistant organic zirconium crosslinking agent and a preparation method thereof. The crosslinking agent is prepared from an inorganic zirconium salt 5%-10%, a polyhydric alcohol 5%-15%, sodium hydroxide 10%-20%, an organic ligand 5%-10%, a complex crosslinking agent 1%-5%, and a heat temperature stabilizer 1%-5% in a water solution. The invention also discloses a fracturing fluid gel prepared from the high temperature resistant organic zirconium crosslinking agent and its preparation method. The fracturing fluid gel is prepared from the high temperature resistant organic zirconium crosslinking agent 0.15%-0.45%, a polyacrylamide thickener 0.3%-0.6%, potassium chloride 0.5%-1%, a temperature stabilizer 0.1%-0.3%, a cleanup additive 0.8%-1.5% and an anti-swelling agent 1.5%-2% with water as a solvent. The high temperature resistant organic zirconium crosslinking agent is suitable for fracturing transformation of an oil reservoir with main characteristics of deep layer, high temperature and low permeability, not only can obviously improve temperature resistance and shearing resistance of a fracturing fluid gel system, but also has a crosslinking delaying performance. And the fracturing fluid gel formed by crosslinking at a temperature of 180-200 DEG C with the polyacrylamide is stable in gel performances, good in temperature resistance and shear resistance, good in hydraulic fracturing effect, and can meet fracturing operation requirements.

The invention discloses a low-hydrocarbon fracturing fluid cross-linking agent and a preparation method thereof. The cross-linking agent is prepared from, by weight, 40%-50% of ferric iron, 15%-25% of alcohol, 1%-5% of alkyl quaternary ammonium salt, 20%-35% of complexing agent and 0.5%-1% of modifier. The preparation method of the cross-linking agent includes the following steps that the bath temperature is adjusted to be 50-60 DEG C, and the stirring speed is controlled to be 100-500 r / min; under the condition that refined nitrogen is introduced, the ferric iron and the complexing agent are added first, the alcohol and the alkyl quaternary ammonium salt are added after reacting is conducted for 2 hours, then the modifier is added after reacting is conducted for 3.5 hours, and accordingly the low-hydrocarbon fracturing fluid cross-linking agent is obtained. The cross-linking agent is good in cross-linking effect, the temperature resistance is improved, and cross-linking time can be adjusted according to field needs. The preparation method is reliable in principle and easy and convenient to operate, and market application prospects are broad.

The invention discloses a boron cross-linking agent and a boron crosslinking fracturing fluid used for high temperature deep well. The boron cross-linking agent is a boron-based multi-element chelate, which takes a boron-containing compound and a chelating agent as main materials and water as a solvent for reacting under certain pH value and temperature. The boron crosslinking fracturing fluid comprises the following components by mass percentage: 0.02-0.04% of boron cross-linking agent, 0.3-0.6% of thickening agent hydroxypropyl guanidine gum, 0.02-0.03% of bactericide dodecyl dimethyl benzyl chloride, 1-2% of clay stabilizing agent potassium chloride, 0.02-0.03% of high temperature stabilizing agent stabilizing agent sodium hyposulfite, 0.04-0.05% of fluorocarbon surfactant, 0.02-0.03% of PH conditioning agent sodium hydroxide and balance of water. The boron cross-linking agent can effectively control the crosslinking speed, the boron crosslinking fracturing fluid has good high temperature resistance and high shear performance, and has the advantages of low frictional resistance, easy flowback and wide market prospect.

A high-temperature resistant seawater-based polymer fracturing fluid capable of continuous blending and a preparing method thereof are disclosed. The fracturing fluid includes 0.4-0.8 wt% of a thickening agent, 0.3-0.6 wt% of an auxiliary synergist, 0.2-0.4 wt% of an activating agent, 0.2-0.4 wt% of a metal ion stabilizer, and 0.3-0.4 wt% of a temperature stabilizer, with the balance being seawater. Beneficial effects of the fracturing fluid are that: a water-soluble multi-component copolymer is adopted as the thickening agent of the fracturing fluid system so that the fracturing fluid can rapidly swell in seawater having a high degree of mineralization; a low-viscosity high-elasticity fluid having a high space structure is formed through synergistic effects (non-crosslinking functions) with the auxiliary synergist; a sand-carrying property is good when the apparent viscosity is greater than 20 mPa.s; the prepared fracturing fluid is not eroded by bacteria, has characteristics of salt resistance, good temperature resistance and shearing resistance, low harm, no residue after cleaning, and the like, and can be prepared in batch or mixed continuously by adopting sea water; and the fracturing fluid can significantly reduce offshore fracturing construction costs and can increase fracturing construction efficiencies and reservoir yield-increasing effects.

The invention relates to a fracturing fluid thickening agent and preparation and application thereof. The thickening agent is mainly prepared from the following components in percentage by weight: 15-20% of acrylamide monomer, 6-10% of acrylic monomer, 3-6% of sodium carbonate, 3-8% of 2-acrylamide-2-methylpropanesulsonic acid, 1-4% of dimethyldiallylammonium chloride (60% aqueous solution), 0.03-0.08% of potassium persulfate and the balance of water. The preparation comprises the following steps of: adding the acrylic monomer and water into a reaction kettle; starting stirring and slowly adding sodium carbonate, wherein the adding speed is proper when the bubbles generated by the reaction do not overflow out of the reaction kettle; stirring till sufficient dissolution; adding 2-acrylamide-2-methylpropanesulsonic acid, and stirring till sufficient and uniform mixing; adding the acrylamide monomer and dimethyldiallylammonium chloride, and stirring till sufficient dissolution; heating the reaction liquid to 40 DEG C, introducing nitrogen, and performing thermal insulation stirring for 20 minutes; adding potassium persulfate; continuously introducing nitrogen, and stirring for 30 minutes; stopping the stirring, and reacting for 4 hours to obtain gel; and grinding the reaction product, drying and granulating to obtain the thickening agent.

The invention discloses a linear gel fracturing fluid for automatically breaking a reservoir in shale gas fracturing and a preparation method thereof. The linear gel fracturing fluid is formed through self-assembly of an anionic hydrophobic associated polymer and a thermally-unstable cationic surfactant. According to the technical scheme, the method comprises the following steps: (1) copolymerizing dodecylmaleimide serving as a hydrophobic monomer and acrylamide to obtain the anionic hydrophobic associated polymer; (2) reacting long-carbon-chain tertiary amine with CO2 to prepare a thermally-unstable ammonium bicarbonate cationic surfactant; (3) adding a thermally-unstable surfactant of 100 to 600mg.L<-1> with a hydrophobic associated polymer solution slightly lower than a critical association concentration to form the linear gel fracturing fluid for automatically breaking the reservoir. The linear gel fracturing fluid for automatically breaking the reservoir has high proppant carrying capacity in the ground and a shaft; the thermally-unstable surfactant is decomposed in the reservoir, and the linear gel fracturing fluid plays a role in automatic breaking, so that damage to the reservoir is reduced; the linear gel fracturing fluid has a wide application prospect in shale gas fracturing.

Belonging to the technical field of oilfield chemistry, the invention discloses a high temperature resistant delayed gel breaking agent and a preparation method thereof. The high temperature resistant delayed gel breaking agent has a core-shell structure, the core material of the core-shell structure is sulfate and / or peroxide, and the shell material is at least one of silicon dioxide, aluminum silicate and calcium silicate. The gel breaking time of the high temperature resistant delayed gel breaking agent can reach 5-7d in a high temperature environment of more than 150DEG C, can meet the construction requirements of water-based crosslinked gel fracturing fluid and the construction requirements of gel valve isolated mineshaft in an unbalanced drilling completion operation process, and is conducive to sand carrying of fracturing fluid and shaft sealing of the mineshaft by the gel valve. In addition, the preparation method of the high temperature resistant delayed gel breaking agent is simple and is low in cost, and can realize large-scale production.

The invention discloses high temperature-resisting cleaning CO2 foam fracturing liquid suitable for unconventional oil and gas reservoir development. The high temperature-resisting cleaning CO2 foam fracturing liquid in gas phase is CO2; the high temperature-resisting cleaning CO2 foam fracturing liquid in liquid phase is high temperature-resisting cleaning fracturing liquid; the foam mass is 52 percent to 75 percent. The high temperature-resisting cleaning CO2 foam fracturing liquid is prepared from the following raw materials in percentage by weight: 0.3 to 0.65 percent of thickening agent, 0.2 to 0.5 percent of viscosity synergist, 0.2 to 0.3 percent of pH (Potential of Hydrogen) value modifier, 0 to 0.2 percent of high-temperature stabilizing agent, 0.01 to 0.1 percent of gel breaker and water, wherein the thickening agent is prepared from acrylamide, vinylpyrrolidone, maleic acid, anionic functional monomers, an initiating agent, inorganic salt and the like; the viscosity synergist is mainly prepared from an anionic surfactant; the pH value modifier is mainly prepared from an organic acid. According to the high temperature-resisting cleaning CO2 foam fracturing liquid disclosed by the invention, the temperature-resisting ability is up to 140 DEG C, the sand carrying performance is excellent, the frictional resistance is low, the foam stability is strong, the content of residual slag is extremely low, the stratum compatibility is good, back flowing is easy, the construction effect is quickly obtained, and important significances to effective development of an unconventional oil and gas reservoir and protection of a reservoir stratum are obtained.

The invention discloses clean carbon dioxide foam fracturing fluid and a preparation method thereof, and relates to the technical field of oilfield chemistry and fracturing production increase. The carbon dioxide foam fracturing fluid is mainly composed of a base solution, a foaming agent, a gel breaker and liquid carbon dioxide with the mass ratio being 100 to 0.15-0.45 to 0.02-0.08 to 100-900. The base solution is formed by 0.2%-0.55% of a thickening agent and water. The thickening agent is mainly formed by bisacrylamide, vinyl pyrrolidone, kation unsaturated monomer, anion unsaturated monomer, an initiator, sodium carbonate, an emulsifying agent and a hydrotropy agent. The foaming agent is mainly formed by hexadecyl dimethyl tertiary amine, dimethyl sulfate, caustic soda flakes, potassium persulfate and solvent. The clean carbon dioxide foam fracturing fluid has the advantages of being high in foam stability, high in temperature resistance and shear resistance, high in sand-carrying performance, wide in applicable temperature range, extremely low in residue content, high in backflow performance, and small in secondary damage to a reservoir after fracturing, thereby improving the fracturing effect and increasing the reservoir productivity.

The invention discloses a cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and a preparation method thereof. The preparation method comprises the following steps of (1) preparing a thickener for the fracturing fluid; (2) preparing a cross-linking agent for the fracturing fluid; (3) preparing a gel breaker for the fracturing fluid and (4) preparing the cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid. The fracturing fluid prepared by adopting the preparation method has the characteristics of excellent viscoelasticity, temperature resistance and shear resistance, sand-carrying performance and wide applicable temperature range; the fracturing fluid can well meet the requirement on the fracturing construction, and the content of the residue is very low; after the fracturing, the secondary harm to a reservoir is small and thus the fracturing effect is improved and the production capacity of the reservoir is increased.

The invention relates to a high temperature resistant cleansing emulsion or microemulsion fracturing fluid and a preparation method thereof. The emulsion fracturing fluid is composed of a continuous oil phase, a polymer (I)-containing dispersed water phase and an emulsifier. The preparation method of the emulsion fracturing fluid includes: preparing a mixed solution of the oil phase and the emulsifier, preparing a four-monomer containing water phase, conducting a polymerization reaction in the presence of an initiating agent, and other steps. The product provided in the invention has low apparent viscosity, and can dissolve rapidly. When the emulsion dissolves into gel, the emulsifier can have a synergistic effect with an association polymer, thus further improving and maintaining the viscosity, and helping to prevent leak-off and help flowback. An oxidation gel breaking way is employed for gel breaking, the gel can be completely broken, and the gel breaking solution has low viscosity and contains no residue. The emulsion fracturing fluid is easy to undergo flowback, and has low damage to the stratum.

The invention discloses a high-temperature-resistance low-friction weighted clean fracturing fluid which is suitable for high-temperature and high-pressure reservoir reconstruction at 170 DEG C and a preparation method thereof.The fracturing fluid is prepared from, by weight, 0.2%-0.8% of high-temperature-resistance thickening agent, 0.1%-0.8% of system synergist, 0.1%-0.3% of high temperature stabilizer, 0%-42% of weighting agent and the balance fresh water.The high-temperature-resistance low-friction weighted clean fracturing fluid has the following functions and advantages that the weighting agent can be adopted for weighting, and the density is adjustable between 0 and 1.32 g / cm<3>; good temperature-resistance and anti-shearing properties are achieved, and the requirement of high-temperature deep well fracturing construction at 170 DEG C can be met by adjusting a formula; a good resistance reduction property is achieved, pipeline friction resistance can be effectively reduced, and the resistance reduction rate can reach 70%; the fracturing fluid is a fluid with a reversible structure, and the structure damage after high shearing is small; the residue content of the fracturing fluid is decreased to below 10 mg / L, damage to a reservoir and supporting cracks is reduced, the fracturing effect is improved, and the reservoir productivity is increased.

The invention discloses a nano-liquid breaker for fracturing fluid and a preparation method thereof. The nano-liquid breaker for fracturing fluid is made of the following components in weight ratio, peroxide 5.2%-16.4%; Gemini surface Active agent: 2.3%-10%; non-ionic emulsifier 8.4%-16.0%; auxiliary additive: 1.9-4.4%; solvent: 62.5-78.5%; the structure of the nano-liquid breaker for fracturing fluid is non-ionic The emulsifier and the gemini surfactant form mixed micelles or vesicles with a closed double-layer structure, and the peroxide forms an ion pair with the inner layer structure and is wrapped inside the micelles or vesicles; the fracturing fluid uses nano-liquids The size of the mixed micelles or vesicles of the destroying agent is nanoscale, specifically between 15-100nm. The invention can meet the gel-breaking requirements of polymer fracturing fluid and guar gum fracturing fluid, and has the characteristics of good storage stability at room temperature, weak corrosion, long storage period, good delayed gel-breaking effect, and the like.

The invention discloses a reversed-phase microemulsion thickening agent applied to online fracturing construction. The reversed-phase microemulsion is prepared from the following ingredients in percentage by mass: 10.0 to 15.0% of acrylamide, 5.0 to 8.5% of acrylic acid, 0.02 to 0.15% of strong hydrophilic monomer, 0.1 to 0.5% of functional monomer A, 0.5 to 1.5% of functional monomer B, 3.0 to 8.0% of pH regulator, 2.0 to 3.0% of solubilizer, 7.0 to 9.0% of compound emulsifier, 20.0 to 35.0% of oil solvent, 0.05 to 0.07% of initiator and the balance of deionized water. A preparation method ofthe thickening agent comprises the following steps: firstly, dissolving the pH regulator, the acrylic acid, the solubilizer, the acrylamide, the strong hydrophilic monomer, the functional monomer A and the functional monomer B into the deionized water and stirring to prepare a reaction phase; evenly mixing the oil solvent and the compound emulsifier to obtain a continuous phase; adding the reaction phase into the continuous phase, stirring at high speed to prepare reversed-phase microemulsion and performing polymerization reaction under the action of the initiator to obtain the reversed-phasemicroemulsion thickening agent. The thickening agent disclosed by the invention not only achieves continuous mixture and online construction, but also has excellent temperature resistance, shear resistance and salt resistance.