46results about How to "Increase dynamic shear force" patented technology

The invention relates to a dimer acid-organic amine copolymer which comprises a structural unit from dimer acid, a structural unit from alkylamine and a structural unit from aromatic amine, wherein the dimer acid is an oleic acid-linoleic acid dimer; the alkylamine is one or more of C10-C20 alkyl primary amines, and the aromatic amine is aniline and one or more of anilines of which the benzene ring is subjected to single-point substitution or multipoint substitution by C1-C3 alkyl. The invention also relates to a preparation method of the dimer acid-organic amine copolymer, application of the dimer acid-organic amine copolymer as a shear strength improving agent, a water-in-oil emulsified drilling fluid shear strength improving agent, and a drilling fluid containing the shear strength improving agent. The shear strength improving agent provided by the invention can obviously enhance the dynamic shear force, dynamic plastic ratio and static shear force of the water-in-oil emulsified drilling fluid under the condition of lower consumption, and can be used in the water-in-oil emulsified drilling fluid which contains or does not contain organic soil.

The invention provides a self-steering casing vibration guiding shoe. The self-steering casing vibration guiding shoe comprises a short casing, a coupling, positioning plates, a first power turbine, an eccentric block assembly, a second power turbine, an eccentric head, a plurality of balls, a positioner and a drill bit. The self-steering casing vibration guiding shoe has the advantages that the structure is novel, simple and reasonable, the self-steering casing vibration guiding shoe is especially suitable for a well high in well cementation requirement, in the casing running process, steering of the eccentric head can be adjusted at any time, the casing is guided to run, and the self-steering casing vibration guiding shoe is particularly suitable for a highly-deviated well and a horizontal well; in the circulation process, the solids carrying capacity is greatly improved, the shear breaking effect on detritus at the bottom of the well is obvious, and the cleaning and purifying effects on a well bore are improved; in the circular well cementation process, the dynamic shear force of a drilling fluid or cement is improved, the displacement efficiency is improved, and the mixing and channeling conditions in the well cementation process are reduced; during well cementation, the cementing strength of oil well cement is improved through the shear, stirring and vibration effects, and the well cementation quality is improved.

The invention provides a bicontinuous phase micro-emulsion which comprises an emulsifier, a water soluble acid, an oil phase and a water phase. The emulsifier is an amine nonionic emulsifier. The invention further discloses a drilling fluid containing the micro-emulsion. The drilling fluid comprises the micro-emulsion, an oil base stabilizer, organic soil and a weighing material. The invention further discloses a preparation method of the micro-emulsion and the drilling fluid. The method comprises the steps that other raw materials are mixed, the water soluble acid is added for induction to obtain the bicontinuous phase micro-emulsion and the drilling fluid, or the other raw materials and the water soluble acid are mixed at first to obtain the bicontinuous phase micro-emulsion, a drillingfluid additive is added, and the bicontinuous drilling fluid is obtained. The bicontinuous phase micro-emulsion has the advantages that the unique oil phase and water phase bicontinuous characteristics, high shearing force, low plastic viscosity and viscoelasticity rheologic characteristics are achieved, the advantages of the oil phase and water phase drilling fluids can be shown at the same timewhen the micro-emulsion is used for the drilling fluid, and the water power transmission, suspension, rock debris carrying and well cleaning capability of the drilling fluid are enhanced.

The invention discloses a temporary plugging workover fluid and a preparation method thereof, belonging to the field of oil field chemistry. Based on 100 parts by weight, the temporary plugging workover fluid includes: 0.96-2.7 parts of flour balls, 0.48-1.35 parts of resin balls, 1.92-4.5 parts of swelling inhibitors, 0.29-0.45 parts of suspending agents, and 0.19-0.19 parts of fiber synergists 0.27 parts, 0.10-0.41 parts of antiscalant, 0.19-0.32 parts of degradation agent, and the balance is water; flour balls are mixed with wheat flour and floating beads with a mass ratio of 6:4-7:3, added water to mix, squeezed Made by pressing, cutting, forming and drying; the density of flour balls is 0.97‑1.02g / cm 3 , the particle size is 2‑4mm; resin balls are mixed with petroleum resin and floating beads with a mass ratio of 7:3‑8:3, then mixed with isopropanol and silane coupling agent, extruded, cut, shaped, and dried Prepared; the density of resin balls is 0.97‑1.02g / cm 3 , the particle size is 3-5mm; the fiber synergist is polyvinyl alcohol fiber; the diameter of polyvinyl alcohol fiber is 0.01-0.03mm, and the length is 3-5mm. The temporary plugging and workover fluid can form a temporary plugging layer with compact structure, excellent mechanical strength and pressure bearing capacity, and will not cause damage to the reservoir.

The invention discloses high-temperature resistant water-based drilling fluid and a preparation method thereof. The high-temperature resistant water-based drilling fluid comprises base slurry and a modified high-softening point asphalt liquid, wherein the modified high-softening point asphalt liquid comprises modified high-softening point asphalt granules, water, a stable dispersing agent and a stabilizer; the particle size of the modified high-softening point asphalt granules is less than or equal to 120 mum; the modified high-softening point asphalt granules comprise 7-9 parts by mass of kernels consisting of basic asphalt and 1-3 parts by mass of shells formed by a modifier; the modifier comprises poly-sulfur and free sulfur; the weight ratio of the poly-sulfur to the free sulfur is (3:7)-(7:3). As the modified high-softening point asphalt liquid is added into the drilling fluid disclosed by the invention, and the asphalt granules are prepared in a mode that the base asphalt is coated by a layer of mixture of high-elasticity poly-sulfur and free sulfur, the drilling fluid is small in particle size, has a certain elastic deformation property, is excellent in high temperature resistance and can be stably stored at normal temperature, therefore, the viscosity / yield boosting of the drilling fluid and the dynamic shearing force and the high-temperature high-pressure de-filtration property of the system can be improved.

The invention discloses positively charged gel wall-fixing slurry of diaphragm wall and its application, and belongs to the technical field of wall fixation of diaphragm wall. The positively charged gel wall-fixing slurry is prepared from, by mass, 50-60 parts of bentonite, 1.6-2 parts of pure alkali, 0.5-1 part of caustic soda, 0.05-0.25 part of mixed metal hydroxide, and 1000 parts of water. Through adding mixed metal hydroxide in the slurry, the whole space can form a network structure connected by a polarized water chain, and form a stable system; besides, slurry shows strong dynamic cutting force and high static cutting force; thus the ability of slurry carrying and rock debris suspension is improved.

The invention discloses a preparation method of an organic rheology modifying agent for full-oil-based drilling fluid. The preparation method comprises the following steps: 1) reacting polybasic fatty acid or ester of the polybasic fatty acid with hydroxyalkyl-substituted amine at 130 to 150 DEG C, wherein the hydroxyalkyl-substituted amine reacts with half of the carboxyl groups or carboxylic esters of the polybasic fatty acid or the ester of the polybasic fatty acid based on the rate of charge; and 2) reacting the reaction product in step 1) with organic polyamine at 150 to 170 DEG C, wherein the organic polyamine completely reacts with the amidation-free carboxyl or carboxylic ester in step 1) based on the rate of discharge. The organic rheology modifying agent prepared by the preparation method disclosed by the invention is in a gel structure with a certain strength, and can effectively improve the suspension property and thixotropy of the oil-based drilling fluid, thus the drilling liquid which is high in shear thinning performance and yield value, low in gel strength and low in plastic viscosity can be generated.

The invention discloses a water-based drilling fluid and a preparation method thereof. The water-based drilling fluid includes base slurry and modified epoxy asphalt fluid. The modified epoxy asphalt fluid includes modified epoxy asphalt particles, water, stable dispersant and stabilizer. The modified epoxy asphalt particles include epoxy asphalt The core formed and the shell formed by the modifier, in terms of parts by mass, the core is 7 to 9 parts, and the shell is 1 to 3 parts; the modifier includes polymerized sulfur and free sulfur, and the polymerized sulfur in the modifier The weight ratio to free sulfur is 3:7~7:3. The modified epoxy asphalt fluid is added to the water-based drilling fluid of the present invention, wherein the asphalt particles are a mixture of high-elastic polymeric sulfur and free sulfur coated with a layer of epoxy asphalt, which not only has a small particle size, but also has a certain Elastic deformation ability, and excellent high temperature resistance. The drilling fluid has good rheological properties and high temperature and high pressure fluid loss reduction effect when used at high temperature.

The invention provides a preparation method of a lifted cutting agent. The preparation method comprises the following steps: a styrene vinyl carboxylic acid copolymer, diamine and hydroxyl aliphatic acid are subjected to a reaction to obtain the lifted cutting agent. The lifted cutting agent takes the styrene vinyl carboxylic acid copolymer, diamine and hydroxyl aliphatic acid as raw materials, the lifted cutting agent has an alternative structure, can increase the structural force of drilling fluid, and has higher lifted cutting rate, the oil-based drilling fluid using the lifted cutting agent has high lifted cutting force and strong dynamic carrying and static suspension capability, and requirement of on-site construction can be better satisfied. The lifted cutting agent prepared by theabove technical scheme has a structure shown in a formula I. The invention also provides the oil-based drilling fluid of the lifted cutting agent.