A large multifunctional fracturing fluid experiment system is characterized in that a drug soup and a gas branch enter a foam generator and are mixed, the obtained mixture enters three straight pipes with different calibers, the influences of the calibers on the frictional resistance of the fracturing fluid are measured, or the soup enters a coil pipe in order to measure the frictional resistance, and two ends of each of the above four pipes are respectively connected with a differential pressure sensor; when the frictional resistance is measured, two ends of the four pipes are respectively provided with a valve; during experiment, the above valves can be switched, and one path can be selectively opened, the suspension state of a propping agent in the fracturing fluid can be observed through a multistage window, the obtained fracturing fluid enters a drug pump and is circulated in order to measure the frictional resistance; or the obtained fracturing fluid enters an outlet separator after the experiment. The system is used for measuring a jelly fracturing fluid, a clear water fracturing fluid and a carbon dioxide foam fracturing fluid, or can be used for researching the rheological characteristic, the frictional resistance and the sand carrying performance of a carbon dioxide dry fracturing fluid at different temperatures under different pressures, and can be used for observing the suspension state of the propping agent in the fracturing fluid through the multistage window.

Large multifunctional fracturing fluid experiment system

The invention discloses a high-temperature-resistant polymer thickening agent for an oil field fracturing fluid as well as a preparation method and application of the thickening agent The preparation method of the thickening agent comprises the following step: polymerizing acrylamide, other olefin monomers, an initiating agent and a chain transfer agent in an aqueous solution by virtue of a solution process, wherein the weight ratio of acrylamide to the other olefin monomers to water is (10-20):(6-18):(62-84); and the other olefin monomers are selected from one or more, preferably two or three, of anionic olefin monomers, cationic olefin monomers or non-ionic olefin monomers According to the high-temperature-resistant polymer thickening agent disclosed by the invention, free radicals are generated by using an aqueous solution catalyst process so as to ensure that the monomers are subjected to ternary polymerization or quaternary polymerization to form the anionic high molecular polyacrylamide polymer with the molecular weight of 4,000,000-8,500,000 After the thickening agent is crosslinked with a crosslinking agent, the thickening agent can be used for tolerating high temperature of more than 210 DEG C, and has the advantages of good crosslinked gel elasticity, strong sand carrying capacity, anti-shearing performance, salt resistance, no residues and the like

High-temperature-resistant polymer thickening agent for oil field fracturing fluid as well as preparation method and application of thickening agent

The invention relates to a method for improving the complexity index of a deep shale gas fracture. The method is characterized in that when a fracturing design of the a deep shale gas well is performed, selection and an injection manner of a fracturing fluid, selection of a supporting agent, and the number of perforations are optimized and controlled, and an artificial main fracture can be opened and communicate with a natural fracture as much as possible in an extending process; extension of a single fracture is longer, expansion of the single fracture is wider, and finally the complexity of the deep shale gas fracture can be improved to the greatest extent. The method can be used for deep shale gas reservoirs having the depth of more than 3500 meters and in which the natural fractures containing carbonate minerals are distributed in a reconstruction range of the artificial main fracture, and a certain included angle is formed between the fracturing main fracture and the natural fractures. The method is reasonable in design, is simple in process, is easy to operate, is high in fracturing construction successful rate, can effectively increase the volume of deep shale gas segment fracturing fractures, can remarkably improve the fracturing construction effect, and can acquire more economic benefits.

Method for improving complexity index of deep shale gas fracture

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.

High temperature resistant organic zirconium crosslinking agent and preparation method thereof, and fracturing fluid gel and preparation method thereof

The invention relates to a protective agent composition of a hypertonic special-hypertonic reservoir. The protective agent composition comprises a protective agent and a filling agent, wherein the filing agent comprises calcium carbonate of 600-1000, 300-590 meshes and 50-200 meshes in the weight ratio of 1:(4-30):(0-40), and the protective agent comprises structure units shown in the formulas (1), (2) and (3). The invention further provides a drilling fluid comprising the composition. The invention further provides applications of the drilling fluid in the drilling of the hypertonic and special-hypertonic reservoir. The drilling fluid has the advantages of being simple to use, good in environment-friendly performance, and excellent in reservoir protection performance, greatly reducing the damage of the drilling fluid to the hypertonic special-hypertonic reservoir, and bringing objective economic benefits.

Protective agent composition of hypertonic special-hypertonic reservoir, as well as drilling fluid and applications thereof

The invention relates to a high-temperature-resistant gelled fracturing fluid, and a preparation method and application thereof. The fracturing fluid is mainly prepared from the following components in percentage by mass: 0.4-0.8% of anionic polymer, 0.05-0.20% of crosslinking agent, 0.02-0.16% of pH regulator, 0.01-0.10% of delayed crosslinker, 0.1-0.8% of cleanup additive, 0.01-0.09% of viscosity breaker and the balance of water. The anionic polymer is a terpolymer and is copolymerized from the following components in percentage by weight: 60-70% of acrylamide monomer, 15-25% of anionic monomer, 5-15% of cationic monome, totaling 100%. The fracturing fluid can resist the high temperature of 210 DEG C above, has the advantages of crosslinkability, capability of carrying sand, shear resistance, salt resistance, no residue and the like, and is used for fracturing yield increase of hypotonic high-temperature ultra-deep wells.

High-temperature-resistant gelled fracturing fluid, and preparation method and application thereof

Hydrophobic group grafted and modified guar gum fracturing fluid gel

The invention provides a butane-containing fracturing fluid and a preparation method thereof. The butane-containing fracturing fluid comprises the raw materials in parts by mass: 0.5 to 2 parts of a phosphate thickening agent, 0.1 to 1 part of a crosslinking agent and 100 parts of butane. The preparation method of the butane-containing fracturing fluid comprises the following steps: gaseous butane is placed in an environment of -10 DEG C to -30 DEG C, and the gaseous butane is changed into liquid butane; at the temperature of -10 DEG C to -30 DEG C, water solutions of the phosphate thickening agent and the cross-linking agent are added to the liquid butane and are stirred evenly, and an initial product of the butane-containing fracturing fluid is obtained; at the room temperature and in a pressure-resistance air tight container, the initial product of the butane-containing fracturing fluid is magnetically stirred for 10 min, and the butane-containing fracturing fluid is obtained. The butane-containing fracturing fluid can be prepared under the normal pressure, and has relatively good temperature resistance, shear resistance and sand carrying performance.

Butane-containing fracturing fluid and preparation method thereof

The utility model provides a property testing device of fracturing fluid, and belongs to the technical field of property evaluation of the fracturing fluid. The testing device is provided with a shearing module used for shearing the fracturing fluid, the shorn fracturing fluid is subjected to a subsequent property test, the test is closer to the actual fracturing process, and the testing accuracy is largely improved. The tested properties include the rheological property, the friction property and the sand carrying property, and the test range is expanded. The property testing device of the fracturing fluid can continuously finish the property test, the test process simulates the actual fracturing process, and accordingly the testing accuracy is further improved.

Property testing device of fracturing fluid

The invention provides a reservoir reforming method. The reservoir reforming method includes the steps that the maximum horizontal principle stress and the minimum horizontal principle stress of a predetermined reservoir are measured; a horizontal well comprising a vertical section and a horizontal section is drilled, wherein the included angle between the track of the horizontal section and the maximum horizontal principle stress or the minimum horizontal principle stress ranges from 30 degrees to 60 degrees; a well completion procedure is executed; the predetermined reservoir is cracked so that a crack can be formed in the predetermined reservoir in the direction of the maximum horizontal stress. At the initial design stage, in consideration of the possible extension direction of the crack when the reservoir is cracked, the included angle between the extension direction of the horizontal section and the maximum horizontal principle stress or the minimum horizontal principle stress of the predetermined reservoir is made to range from 30 degrees to 60 degrees, so that the horizontal well has good experience completeness and a good oil-guiding effect of the crack, and then the oil and gas production rate is easily increased.

Reservoir reforming method

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