125results about How to "High consolidation strength" patented technology

Improved methods and compositions for consolidating proppant in fractures formed in subterranean zones are provided. An improvement of this invention comprises using proppant particles having a coating of hardenable resin including a gel breaker. The gel breaker facilitates removal of gelled carrier fluid from the surface of the proppant particles.

Methods and compositions for preventing fracture proppant particle flowback from subterranean zones penetrated by well bores are provided. The methods basically comprise the following steps. One or more fractures are formed in a subterranean zone and proppant particles coated with a curable liquid composition for consolidating the proppant particles into resilient permeable masses are deposited in the fractures. The curable liquid composition is a mixture of a tackifying compound liquid and a curable resin. After the coated proppant particles have been deposited, the curable liquid composition is allowed to cure.

In the invention, two kinds of waste material dry dust discharging coal ash and desulfurize gyp produced by power plant burning sub-bituminous coal or lignitous coal are used as main composition, shell and or cement, calcined gypsum and aluminum sulfate or alunite are used as secondary composition, they are prepared to dry powder soil curing agent by weighing, matching, forced stirring and mixing. The soil can be concreted by mixing a proper quantity of curing agent into the soil and processes of stirring, compacting, soaking and maintaining.

An embodiment of the invention relates to a novel epoxy resin composition. The epoxy resin composition comprises (i) a first epoxy resin having in the molecule thereof at least one water-repellency-imparting group and two or more cyclic aliphatic epoxy groups, and having a number average molecular weight ranging from 8,000 to 22,000 and a polydispersity ranging from 3.5 to 5.0, (ii) a second epoxy resin having in the molecule thereof at least one water-repellency-imparting group and two or more cyclic aliphatic epoxy groups, having a number average molecular weight ranging from 2,500 to 8,000 and a polydispersity ranging from 1.5 to 3.0, and (iii) a cationic polymerization catalyst.

The invention relates to a modified resin sand consolidation agent as well as a preparation method and an application of the modified resin sand consolidation agent. The sand consolidation agent mainly consists of epoxy resin as a main agent, 6.0-7.0% of a curing agent, 15% of a softener, 20-22% of a diluent, 2% of a coupling agent and 10% of glass fiber; and the dosages of the other components expect the epoxy resin is weighed by 100% of the epoxy resin in percentage by weight. The preparation comprises that the modified resin sand consolidation agent is used for preventing and curing sand production in oil wells. The application method comprises the steps of: pre-treating the stratum by using pre-cleaning fluid, then pouring the sand consolidation agent from an oil tube, and finally replacing the sand consolidation agent to the deep of the stratum by using replacement pore-broadening liquid. The formula of the sand consolidation agent disclosed by the invention can solve the problem of influence of sand production in oil wells on the production and is suitable for different sand grains.

The invention relates to a polyurethane-based ecological sand-fixing agent and a preparation method thereof. The sand-fixing agent comprises the following components: 25-29 parts of polyurethane prepolymer, 0.5-2.1 parts of dispersion stabilizer and 27-36 parts of solvent, wherein the polyurethane prepolymer is obtained by polycondensation reaction of polymer polyol and diisocyanate, the polymer polyol comprises polypropylene oxide diol, polyoxyethylene diol and easily-degradable polymer diol, the mass ratio of polypropylene oxide diol to polyoxyethylene diol is (1:3)-(5:1), and the easily-degradable polymer diol accounts for 13-23wt% of the polymer polyol; and the mass ratio of the polymer polyol to diisocyanate is (4:1)-(7:1). The preparation method comprises the following steps: controlling the temperature at 85-100 DEG C under nitrogen gas protection, allowing reaction between the polymer polyol and diisocyanate to obtain a polyurethane prepolymer, and homogeneously mixing the polyurethane prepolymer, the dispersion stabilizer and the solvent to obtain the polyurethane-based ecological sand-fixing agent.

The invention relates to an epoxy modified polyurethane double-component grouting material for road engineering maintenance and a preparation method thereof, wherein the grouting material comprises a component A and a component B; the component A comprises following components in part by weight: 700-800 parts of polyether glycol, 100-300 parts of epoxy resin addition product, 20-40 parts of foaming agent, 40-80 parts of foam stabilizer and 10-40 parts of catalyst; and the component B is polyphenyl polymethylene polyisocyanate. The preparation method comprises the step of mixing and stirring the component A and the component B according to the mass ratio of (0.8-1.5): 1 uniformly. The grouting material has the advantages that: when the material participates in foaming reaction and is cured, the compression strength and bonding force of the formed liquid cement are improved, and the maximum tensile shear strength can reach 4.3Mpa, so that the grouting material is better than the grounding material mixed by polyurethane and epoxy resin; and the grouting material reduces builder body damage and has a certain economic benefit.

The invention discloses a method for constructing a roadbed through sand filling, and belongs to the field of traffic construction. In the technical scheme, the method is characterized by including the steps of surveying and setting out, surface clearing, filling, reinforcing, mixing, rolling compaction of a bulldozer, rolling compaction of a road roller and paving. The method solves the technicalproblem that in the prior art, the roadbed is prone to losing stability and deforming, and is applied to road construction to enhance the effect of roadbed stability.

The invention discloses coated sand for sand prevention in an oil well and a preparation method of coated sand. The coated sand comprises A-type coated sand and B-type coated sand and is characterized in that the A-type coated sand is obtained by wrapping quartz sand with organosilicon-modified epoxy resin, a ketimine curing agent and external isolating agent hydroxy methyl cellulose in sequence; B-type coated sand is obtained by wrapping the surface of the quartz sand with cycloaliphatic epoxide resin, an amine curing agent and external isolating agent hydroxy methyl cellulose in sequence. The coated sand disclosed by the invention comprises the A-type coated sand and B-type coated sand, and a co-synergistic effect is generated after the A-type coated sand and the B-type coated sand are mixed, so that the requirements for low-temperature curing and high-temperature mining are met simultaneously. The coated sand disclosed by the invention meets the actual application requirements, gives consideration to low-temperature curing (a minimum temperature of 40 DEG C) to form higher strength, simultaneously is good in permeability, can stably work in a high temperature-resistant environment (about 280 DEG C), is wide in research and development scope of application, can be suitable for not only heavy oil wells, but also middle and low-temperature oil wells and water wells and is lower in comprehensive cost.

The invention relates to a long-acting active sand-controlling oil washing agent and a preparation method thereof. The sand-controlling oil washing agent is composed of the following raw materials in percent by mass: 3-5 parts of a long-chain fatty acid ammonium salt, 0.3-0.6 part of a silane coupling agent, 3-5 parts of a poly-amino compound, 1-3 parts of formaldehyde, 2-5 parts of a water soluble surfactant, 0.1-0.3 part of a hydroxide, 0.2-0.5 part of hydrochloric acid and 5-10 parts of hexane. The sand-controlling oil washing agent is synthesized by employing a three-step method. The action principle comprises that the surfactant is absorbed on rock and displaces crude oil originally attaching to rock, so that crude oil falls off from the surface of rock, and the purpose of washing oil is realized; excess ammonium ions are absorbed on the surface of clay, so that the electrostatic repulsion force on the surface of clay is counteracted and clay is stabilized; and also through the consolidation effect of generated sand-controlling oil-washing resin macro-molecules on sandstone, gravels are stabilized and consolidated.

The invention provides a soil curing agent. The soil curing agent is prepared from a component A and a component B; the component A is prepared from water, ethanol, tourmaline, a component A cationicsurfactant and low molecular polyol; the component B is prepared from polysaccharide, a component B surfactant, a biological enzyme, calcium carbonate, a complex compound, an inorganic-organic compound, water and ethanol.

The invention discloses a method for casting and solidifying the end portion of a fiber rope. The method relates to the fiber rope and a joint. The method comprises the steps of scattering one end of the fiber rope, folding the end portion in half in an inserting and weaving mode, thickening the end portion of the fiber rope, inserting the partially thickened end portion of the fiber rope from the small-bore end of the joint, scattering fiber strands, inserted into the joint, of the fiber rope into a cone shape, allowing the fiber strands to be evenly distributed inside a casting cup, slowly pouring prepared resin into the casting cup, and allowing the end portion of the fiber rope and the joint to be solidified together. The joint and the thickening portion of the fiber rope are pre-tensioned, and fibers of the thickening portion are evenly stressed so that whole breaking force is improved. The method is used for solidification of the end portion, connected with the resin, of the fiber rope. According to the method for casting and solidifying the end portion of the fiber rope, the proper resin, the proper joint with an inverted-cone-shaped hole and a proper solidification part are selected for partial thickening and casting, solidification strength of the rope is improved so that the aim of equal strength casting of the fiber rope can be achieved, and therefore a fiber use ratio is improved.

The invention relates to an emulsion type low-temperature sand consolidation agent and a preparation method and application thereof. The emulsion type low-temperature sand consolidation agent is characterized in that an oil-in-water type Pickering emulsion is prepared from a water phase, an oil phase and an emulsifying stabilizer; the emulsifying stabilizer is dispersed in an interface of the water phase and the oil phase; the water phase is prepared from an adhesive, a curing agent and a coupling agent. The emulsion type low-temperature sand consolidation agent has the advantages that the sand prevention requirement of low-temperature stratums can be met, the high temperature-resistant characteristic is realized, and the good water-resistant, oil-resistant, alkaline-resistant and salt-resistant properties are realized; after the resin in the emulsifier is cured, the oil phase in the emulsion system is also used as a pore expansion agent, so that the good permeability of the stratum isguaranteed, and the damage to the stratum is little; the emulsion type low-temperature sand consolidation agent is suitable for the secondary sand prevention of common straight wells, large-inclination wells and irregular well holes after failure of chemical sand prevention or mechanical sand prevention, and the application range of sand prevention is broad.

The invention relates to an ultralow density plugging agent for low-pressure leaking formations and a preparation method thereof. According to the technical scheme, the ultralow density plugging agent is composed of, by weight, water as a continuous phase, 50-70% of a gel plugging agent, 0.1-0.3% of plugging fiber, 2.5-3.5% of a surfactant, 2-6% of a lightweight rigid plugging additive, 1-2% of polymer and 0.5-2% of water-absorbent expansion resin. the invention has the following beneficial effects: through built-in-test, the lowest density of the prepared plugging agent can reach 1.0g/cm<3>, and density is adjustable; the plugging agent has good temperature resistance which can reach 180 DEG C, and is especially suitable for plugging of deep and ultra-deep wells; bearing capability is greater than or equal to 15 MPa, and the plugging agent has characteristics of large plugging depth and good plugging effect and is applicable to various types of formation leakage such as large-sized cracks and pore-fractures, etc.

To provide resin-coated sand for a multilayer mold in which the consolidation strength of the casting mold obtained by using it and gas permeability thereof are improved at the same time, the amount of occurrence of pyrolytic products (tar, soot and the like) derived from organic substances is effectively inhibited, when molding is performed using such a casting mold, and further, the casting mold after molding can exhibit excellent collapsibility. Disclosed is resin-coated sand for a multilayer mold, in which surfaces of refractory particles are coated with a binder composition containing a phenolic novolak resin having an ortho/para bond ratio of methylene groups of 1.5 or more and an aromatic amine as indispensable constituents, and the grain fineness number is from 80 to 150.

The invention discloses a sand-preventing method of an artificial borehole wall, and a material for sand prevention. The material for sand prevention comprises guide liquid, sand carrying liquid and promoting liquid which are prepared separately, wherein the guide liquid comprises the following components in percentage by weight: 0.5 to 20 percent of sodium chloride, 0.2 to 2 percent of calcium chloride, 0.1 to 1 percent of magnesium chloride, 0.2 to 4 percent of alkylphenol polyoxyethylene, 0.3 to 8 percent of an anionic surfactant capable of resisting calcium and magnesium ions and 0.01 to 6 percent of a dimethyl diallyl ammonium chloride-acrylamide-acrylic acid copolymer; the sand carrying liquid comprises the following components in percentage by weight: 0.01 to 5 percent of a dimethyl diallyl ammonium chloride-acrylamide copolymer and 0.5 to 20 percent of ammonium chloride; and the promoting liquid comprises the following components in percentage by weight: 8 to 22 percent of a penetrating agent and 18 to 35 percent of a dehydroxylation catalyst. The material for sand prevention performs sand prevention, can protect the stratum, has high sand carrying capability, reduces friction and enhances the consolidation strength, and the penetration ratio of the artificial borehole wall formed after sand prevention is more than 12 <mu>m<2>.

The invention discloses a solidifiable flow sand bridge plugging method for a shaft of an oil and gas well, and relating to the technical field of fracture reconstruction work and rework operation used in petroleum extraction. 2-8 percent by volume of solidifiable particles, 20-30 percent by volume of quartz stand and 60-80 percent by volume of carrier fluid are mixed on the ground and then injected into the shaft; the mixed fluid is conveyed to a perforated interval; after the carrier fluid is heated and becomes less viscous by a stratum, filtrate enters the stratum; the solidifiable particles are cemented and solidified with the quartz sand under the effects of temperature and pressure to form high-strength solid so as to realize plugging of the shaft at the perforated interval. By using the method, pipe column trip is not required, and the operation risk caused by pipe column trip is avoided; the number of isolated intervals is not limited, so that an infinite series of layered/interval reconstruction operation can be theoretically realized.

The invention provides an application of graphene oxide in improving soil consolidation strength, a composition and an application method of the composition, and relates to the technical field of microbially induced calcium carbonate soil improvement. According to the application of graphene oxide in improving the soil consolidation strength, the composition and the application method of the composition, the graphene oxide can enable microorganisms to induce the rapid growth of calcium carbonate crystals in calcium carbonate, and the yield of the calcium carbonate is increased; and the size ofthe calcium carbonate crystals can further be changed, the consolidation of soil is facilitated, and the compressive strength of the soil is improved.