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.

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.