34results about How to "Temperature resistance" patented technology

The invention belongs to the technical field of development of oil fields, and particularly relates to a seawater-based fracturing fluid which is suitable for preparing sweater and can be used for realizing continuous blending and a preparation method thereof. The seawater-based fracturing fluid is prepared from the following raw materials in part by weight: 0.5-1.5 parts of thickening agent, 0.3-1.0 parts of crosslinking agent, 0.2-0.6 parts of surfactant, 0.01-0.2 parts of pH value regulating agent, 0.01-0.2 parts of viscosity breaker, 46.5-64 parts of seawater and 35-50 parts of desalted seawater. The seawater-based fracturing fluid has the advantages of suitability for preparing seawater, capability of realizing continuous blending, high temperature resistance, high salt resistance, high shear resistance and quick dissolvability.

The invention discloses an amphoteric heat-resistant and salt-resistant filtrate reducer for drilling fluid and a preparation method. The amphoteric heat-resistant and salt-resistant filtrate reducer is prepared from, by weight parts, acrylamide, alkenyl sulfoacid or alkenyl sulphonate, acrylic acid, cationic monomers, rigid monomers, sodium hydroxide, potassium hydroxide, dispersant, deionized water, a molecular weight modifier and an initiator. The preparation method includes the steps that acrylamide, acrylic acid, alkenyl sulfoacid or alkenyl sulphonate, the cationic monomers, the rigid monomers and the deionized water are added into a reactor, after the materials are dissolved, the pH value of the solution is adjusted, the dispersant is added, the materials are mixed, then the mixture is transferred into a reaction still, nitrogen is introduced for deoxygenization, the initiator is added for triggering polymerization, and jelly is taken out after the reaction is completed, dried, smashed and sieved. The molecular weight of the filtrate reducer for the drilling fluid is controllable; the filtrate reducer can adapt to complex drilling conditions, and can be used in horizontal wells, high-temperature deep wells and evaporite beds; fewer residual monomers of the filtrate reducer for the drilling fluid are generated; the filtrate reducer and other oil field chemicals are good in compatibility; the preparation method is simple; the cost is low, and popularization is promoted.

A hot melt adhesive for use on porous substrates, wherein the hot melt adhesive has

• • a) about 10% to about 70% by weight of a polypropylene homopolymer having a DSC melting point of less than 100° C.;
  • b) about 10% to about 60% of a first tackifying resin having a Ring & Ball Softening Point of about 95° C. to about 140° C.;
  • c) about 0% to about 65% of a second tackifying resin that is different than the first tackifying resin;
  • d) about 5% to about 50% of a plasticizer;
  • e) about 1% to about 40% by weight of a secondary polymer which is either a semi-crystalline polymer or wax with an enthalpy of fusion of greater than 30 Joules/gram;
  • f) about 0.1% to about 5% of a stabilizer or antioxidant;

wherein the components total 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 20,000 centipoise (cP) at 163° C. (325° F.).

The invention provides solid-free drilling fluid. The solid-free drilling fluid comprises water and polymer swelling particles, and preferably, the solid-free drilling fluid also comprises alkali and/or salt. The solid-free drilling fluid provided by the invention can be formed by matching polymer swelling particles with different types, different swelling multiples and different particle sizes according to stratum requirements. The solid-free drilling fluid has the advantages of stable performance, high temperature resistance, high salt resistance, high rheological property, high lubricity and high filtration reducing property, and has simpler slurry matching and maintenance processes compared with conventional solid-free drilling fluid.

The present invention provides a temperature-resistant and salt-resistant hydrophobic association polymer preparation method, which comprises: (1) sequentially adding deionized water, disodium ethylenediaminetetraacetate, an acrylamide monomer, N,N-dioctylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, a surfactant, a co-solvent, a chain transfer agent and an inorganic salt to a polymerization kettle, uniformly stirring, and cooling to a temperature of 5-10 DEG C under the action of frozen salt water; (2) introducing high purity nitrogen for 1-2 h, adding a multi-stage composite initiator, carrying out an adiabatic polymerization reaction for 5-7 h, taking out a colloid, and granulating; and (3) adding a hydrolysis agent, carrying out hydrolysis for 2-4 h at a temperature of 90-110 DEG C, and drying for 2-3 h at a temperature of 90-110 DEG C to obtain the temperature-resistant and salt-resistant hydrophobic association polymer. According to the present invention, the prepared temperature-resistant and salt-resistant hydrophobic association polymer has advantages of good tackifying property, good temperature resistance, good salt resistance, good shearing resistance, good long-term stability, and high oil displacement efficiency.

The invention provides an association type high-temperature resistant fracturing fluid suitable for volcanic rock fracture. The fracturing fluid comprises two parts, namely a base liquid and construction additives. The base liquid comprises following components by weight: 0.5-0.9% of a thickening agent and 0.2-0.3% of a flow promoter, with the balance being water. The construction additives comprise a thickening auxiliary agent and a gel breaker. The thickening auxiliary agent is 0.25-0.45% by weight of the base liquid. The gel breaker is 0.02-0.05% by weight of the base liquid. The fracturing fluid belongs to supramolecular structure fluids, and has good viscoelasticity, thus achieving viscoelastic sand carrying. The fracturing fluid has characteristics of capability of being clean and free of residue, good temperature resistance, shearing resistance, shearing dilutability, and the like. During fracturing construction, the fracturing liquid can reduce friction so as to reduce the construction pressure, and the fracturing liquid is low in harm to a reservoir stratum, thus increasing the success rate of fracturing construction, improving fracturing effects, and increasing the productivity of the reservoir stratum. The fracturing liquid is suitable for fracturing transformation of a volcanic rock reservoir stratum.

The invention provides a high temperature resistant organic phosphonic acid polymer fluid loss agent, and a preparation method and applications thereof. The preparation method comprises following steps: isopropenyl phosphonic acid monomer, an acrylamide monomer, and a sulfonic acid group-containing monomer are subjected to polymerization under the effect of an initiator so as to obtain the high temperature resistant organic phosphonic acid polymer fluid loss agent; wherein the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-methacrylamide, N-ethyl acrylamide, or N, N-dimethylacrylamide, the sulfonic acid group-containing monomer is selected from 2-acrylamido-2-methylpropane sulfonic acid, p-vinylbenzenesulphonic acid, or alkyl sulfonate. The high temperature resistant organic phosphonic acid polymer fluid loss agent comprises a first repeat unit with a structure represented by formula 1, a second repeat unit with a structure represented by formula 2, and a third repeat unit with a structure represented by formula 3, can be used for preparing drilling fluid which possesses better temperature resistance and salt resistant, and is suitable for high temperature highsalinity drilling fluid systems.

The invention relates to a filtrate reducer for drilling fluid and a preparation method of the filtrate reducer, and belongs to the technical field of oil industry drilling fluid treatment agents. The filtrate reducer for the drilling fluid comprises, by weight, 8-20 parts of natural asphalt, 5-8 parts of methylene diacrylamide, 3-5 parts of maleic anhydride, 6-10 parts of methyl methacrylate isooctyl, 0.02-0.06 part of sodium hydrogen sulfite, 3-5 parts of sodium humate, 5-8 parts of xanthan gum, 4-6 parts of polyacrylic acid, 0.5-1 part of chloretone, 0.1-0.3 part of edetate disodium, 1-5 parts of triethanolamine, 10-15 parts of pentaerythritol and 50-80 parts of ethyl acetate. The filtrate reducer has a fine filtrate reducing function and further has the advantages of fine temperature resistance, salinity resistance, collapse prevention, lubrication and the like.

The invention provides a preparation method of a multifunctional polymer oil displacing agent, and the method is as follows: using 2-(Perfluorooctyl) Ethyl Acrylate as a hydrophobic monomer, adding anemulsifier, an initiator and water, adding acrylamide, 2-Acrylamide-2-methylpropanesulfonic acid and Methacrylatoethyl trimethyl ammonium chloride to together form a solution, and preparing the multifunctional polymer oil displacing agent by free radical micellar copolymerization. The invention also provides the oil displacing agent prepared by the method and application thereof. The multifunctional polymer oil displacing agent can be used as a multifunctional polymer for integration of profile control of a water injection well of an oilfield, oil washing and oil displacement of an oil layerand viscosity reduction of crude oil. The multifunctional polymer oil displacing agent has strong intermolecular hydrophobic association in an aqueous solution, and has salt resistance, shear resistance and high temperature resistance. The preparation process is simple, the profile control intensity is high, the effective period is long, and the oil displacement performance is good.

The invention relates to a control method for laminated low-temperature-resistant films of a packaging box. The control method is realized by the steps of: detecting the shrinkage stress value of various films in a low-temperature condition; detecting the 90-degree peel strength and 180-degree peel strength of various food-grade low-temperature-resistant laminating glues in a low-temperature environment after the glue is applied; ensuring that the peel strength of the glue is greater than the shrinkage stress value of the films; and determining a proper proportion between the films and the glue. The control method for the laminated low-temperature-resistant films of the packaging box provided by the invention has the beneficial effect that the temperature endurance of the packaging box can be figured out in a design phase according to the characteristics of the materials in a low-temperature state, thus reducing the time, cost and efforts of design and development.

The invention provides a biomass synthetic resin filtrate reducer which has a structure shown in a formula I. In the formula I, n is an integer ranging from 15 to 22. The invention provides a preparation method of the biomass synthetic resin filtrate reducer; the preparation method comprises the following step: mixing furfuryl alcohol, furfural, sodium pyrosulfite, anhydrous sodium sulfite and water to obtain the biomass synthetic resin filtrate reducer. The product provided by the invention is relatively good in filtrate loss reduction performance, relatively strong in salt resistance and biodegradable; the preparation method of the biomass synthetic resin filtrate reducer is environment-friendly, mild, simple and low in application cost.