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

The invention provides a method of utilizing nanometer silicon dioxide to improve properties of water-based drilling fluid at different temperatures. The method comprises a step of adding a nanometer silicon dioxide dispersing agent into base mud, wherein the mass of the nanometer silicon dioxide particle in the nanometer silicon dioxide dispersing agent is 5-10% of total mass of the base mud and the nanometer silicon dioxide dispersing agent. Due to the nano-scale particle size, the nanometer silicon dioxide material can be filled into small holes and cracks of the shale stratum to improve the plugging effect of the water-based drilling fluid, slow down the trend of permeation of the drilling fluid to the stratum and expansion and chipping of the stratum after water absorption, and improve the stability of the borehole wall. The nanometer silicon dioxide can strengthen the stability of fresh-water base mud and bentonite base mud by increasing the negative charge level of the system. The nanometer silicon dioxide also can enable the base mud to form thinner and compact mud cakes and facilitate the de-filtration effect to be obvious.

The invention relates to a process for preparing drilling fluid, in particular to a process for preparing the drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling. The process comprises a construction process and a dosage formula of treating agents and is characterized in that: according to the dosage formula, the treating agents are prepared by mixing clear water polymer original slurry, poly anionic cellulose (PAC), calcium carbonate (QS-4), carboxymethyl starch (CMS), sulfonated phenolic resin(SMP-2), water dispersible cation emulsified asphalt powder (SFT-1), sodium chloride(NaCL) and sodium formate (WT-1) in a mass ratio of 1,000:2-3:30-40:20-30:2-3:1.5-2:50-100:20; and the construction process comprises the following steps of: according to a circulation circle, uniformly mixing a coating agent PAC, a filtrate reducer CMS, a salt and high-temperature resistant filtrate reducer SMP-2 and an anti-sloughing lubricant SFT-1 for 12h at first; adding QA-4, NaCL, WT-1 into the mixture and uniformly mixing the mixture; and regulating the mixture to have a density Rho of 1.06 to 1.10g/cm<3>, a funnel viscosity T of 38 to 45s and an API water loss FL of 4 to 6ml. The process has the advantages of effectively preventing the balling of a sticking bit and a PDC bit at a lower curved section, reducing a frictional resistance and a torque, eliminating a sticking phenomenon, improving a mechanical drilling rate and ensuring downhole safety.

The invention provides a whole oil-based drilling fluid viscosifier and a preparation method thereof. The preparation method for the whole oil-based drilling fluid viscosifier comprises the steps: 1) uniformly mixing 15-50 parts by weight of polyester polyol, 5-15 parts by weight of a polymerization promoter and 50-150 parts by weight of a solvent at room temperature so as to obtain a mixture; 2) heating the mixture to 40-60 DEG C, adding 15-80 parts by weight of isocyanate and 0.3-1.0 part of a polymerization catalyst under a stirring condition, and continuing to heat the mixture to 70-90 DEG C and enabling the mixture to react for 3-5 h so as to obtain an intermediate product; and 3) cooling the intermediate product to 40-50 DEG C, adding 5-15 parts by weight of a polymerization promoter, heating to 60-80 DEG C and continuing a reaction for 2-3 h so as to obtain the whole oil-based drilling fluid viscosifier. The whole oil-based drilling fluid viscosifier prepared by the preparation method can effectively improve suspension stability of a drilling fluid and improve the rheological property of the drilling fluid without changing the density of the drilling fluid; and therefore, the whole oil-based drilling fluid viscosifier is suitable for exploration and development of low pressure reservoirs.

The invention belongs to the field of well drilling. Aiming at solving the problems that the water loss amount of the traditional positively-charged drilling fluid is great and the drilling fluid cannot be simultaneously used together with a filtration-reducing agent, the invention provides an MMH (mixed metal hydrides) mud composite additive. The MMH mud composite additive is prepared from the following raw materials in parts by weight: 1 part of MMH, 0.2-3 parts of xanthan gum, 0.05-0.1 part of polymer covering inhibitor, 0.05-0.15 part of tackifier, 0.1-0.3 part of organic silicon de-foaming agent and 0.2-0.3 part of superfine calcium carbonate. The invention further provides a drilling fluid which is prepared from the MMH mud composite additive.

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 modified epoxy asphalt and a preparation method thereof, and a water-based drilling fluid and a preparation method thereof. The modified epoxy asphalt comprises the following components in parts by weight: 100 parts of matrix asphalt, 1-20 parts of a compatibilizer, 1-10 parts of a toughening agent, 5-20 parts of a curing agent, 1-5 parts of a curing accelerator and 5-30 parts of an epoxy resin, wherein the curing accelerator comprises a product obtained by reacting polyamine, phenol and an aldehyde-containing aqueous solution. According to the water-based drilling fluid, the modified epoxy asphalt liquid is added and is small in particle size and high in softening point, has a certain elastic deformation capacity and is excellent in high-temperature resistance, sothat the drilling fluid has good rheological property and high-temperature and high-pressure filtrate loss reduction effect when used at a high temperature.

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 discloses a temporary plugging workover fluid and a preparation method thereof, and belongs to the field of oilfield chemistry. The temporary plugging workover fluid comprises, based onthe total weight being 100 parts, 0.96-2.7 parts of flour balls, 0.48-1.35 parts of resin balls, 1.92-4.5 parts of an expansion inhibitor, 0.29-0.45 parts of a suspending agent, 0.19-0.27 parts of a fiber synergist, 0.10-0.41 parts of a scale inhibitor, 0.19-0.32 parts of a degradation agent and the balance of water. The flour balls are prepared by mixing wheat flour and floating beads in a mass ratio of 6: 4 to 7: 3, adding water, and performing mixing, extruding, cutting, forming and drying. The density of the flour balls is 0.97-1.02 g/cm<3>, and the particle size of the flour balls is 2-4mm. The resin balls are prepared by mixing petroleum resin and floating beads in a mass ratio of 7: 3 to 8: 3, adding isopropanol and a silane coupling agent, and performing mixing, extruding, cutting,forming and drying. The density of the resin balls is 0.97-1.02 g/cm<3>, and the particle size of the resin balls is 3-5mm. The fiber synergist is polyvinyl alcohol fiber, the diameter of the polyvinyl alcohol fiber is 0.01-0.03mm, and the length of the polyvinyl alcohol fiber is 3-5mm. The temporary plugging workover fluid can form a temporary plugging layer which is compact in structure and excellent in mechanical strength and pressure bearing capacity, and does not damage a reservoir.

The invention provides pipe jacking thixotropic slurry and a preparation method thereof, belonging to the field of building materials. The pipe jacking thixotropic slurry is prepared from the following components in parts by weight: 6%-10% of sodium bentonite, 0.2%-0.5% of an alkaline inorganic treating agent, 0.1%-0.3% of a flocculating agent, 0.5%-0.8% of a tackifier, 1%-2% of a filtrate reducer, 1%-3% of a lubricating agent and 84%-90% of water, wherein the alkaline inorganic treating agent is sodium carbonate, the flocculating agent is a high-molecular agglutinant, and the filtrate reducer is pregelatinized starch. The invention also provides a preparation method of the pipe jacking thixotropic slurry. The thixotropic slurry has good consistency, can form a high-quality slurry sleeve and has a certain supporting effect; and the components in the formula of the thixotropic slurry have a synergistic effect, so the stability and safety of existing thixotropic slurry are improved, and soil collapse and pavement subsidence are avoided.

The invention relates to the field of building construction, and provides pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry. The pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry is prepared from, by weight, 1,000 parts of water, 75-85 parts of bentonite, 3-5 parts of sodium carbonate and 0.5-1.5 parts of sodium polyacrylate. The invention further provides a preparation method of the pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry. The pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry has the advantages that sodium polyacrylate is adopted for replacing traditional CMC, the slurry wall protecting performance and theslurry recycling rate are greatly increased, and meanwhile corresponding environment contamination and material consumption are reduced; meanwhile, various indexes of the slurry prepared through theformula can meet the requirement of circulating slurry indexes, the wall protecting effect is good, and the groove wall stability is good.

The invention discloses novel lubricant and resistance-reducing slurry for pipe jacking construction in desert areas. The slurry comprises machine head synchronous grouting slurry and follow-up supplement slurry along a line, wherein the machine head synchronous grouting slurry is prepared from the components in parts by weight as follow: 130-150 parts of clay, 1-1.5 parts of carboxymethyl cellulose, 0.25-0.3 parts of sodium hydroxide, 2.5-3.5 parts of a lubricant anti-collapse agent and 1,000 parts of water; the follow-up supplement slurry along the line is prepared from components in parts by weight as follows: 4.5-5 parts of hydrolysis polyacrylamide, 2.5-3.5 parts of a lubrication anti-collapse agent and 1,000 parts of water. A slurry grouting system for pipe jacking construction comprises the synchronous grouting slurry and the follow-up supplement slurry and adopts a synchronous slurry grouting process and a follow-up slurry grouting process; the synchronous grouting slurry mainly has a casing formation and wall protection function on the basis of lubrication and resistance reduction, the follow-up supplement slurry mainly has lubrication and resistance reduction properties, and accordingly, the lubricant and resistance-reducing slurry system performs the lubrication and wall-protection functions best.

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.

The invention discloses a shear strength improving agent for solid-free completion fluid workover fluid for an oil-gas well. The shear strength improving agent comprises the following raw materials inpercentage by weight: 8-12% of metal salt; 28-32% of an alkalinity regulator; 8-12% of a flow pattern regulator; and the balance of water. In addition, the invention further discloses a preparation method of the shear strength improving agent for the solid-free completion fluid workover fluid for the oil-gas well, and the preparation method comprises the following steps: step 1, adding a formulaamount of water into a reaction device, then adding a formula amount of metal salt, and stirring by using a stirring device to quickly dissolve and uniformly mix the metal salt; step 2, slowly addingthe mixture into a formula amount of alkalinity regulator, and regulating the pH value to be 9-10; step 3, after the reaction is completed, adding a flow pattern regulator for stirring; and step 4, evaporating the solvent, and crushing the solvent to obtain powder. The shear strength improving agent can solve the technical problem that solid-phase composite brine completion fluid and workover fluid are poor in suspension and sand carrying.

The invention provides modified nano silicon dioxide, a high-temperature-resistant tackifying and shear-improving agent and preparation methods and applications of the modified nano silicon dioxide and the high-temperature-resistant tackifying and shear-improving agent, and the preparation method of the modified nano silicon dioxide comprises the following steps: S1, carrying out first contact reaction on nano silicon dioxide and an amino-containing silane coupling agent in an alcohol solvent to obtain a first contact reaction product; s2, the first contact reaction product and polyfatty acid are subjected to a second contact reaction, the modified nano-silica is obtained, and the polyfatty acid is selected from C18 unsaturated fatty acid dimer or C18 unsaturated fatty acid trimer. The modified nano silicon dioxide and the high-temperature-resistant tackifying and shear-improving agent disclosed by the invention can effectively improve the structural strength of a water-in-oil emulsified drilling fluid system in an extreme high-temperature environment, especially improve the dynamic shear force and low-shear-rate viscosity of the water-in-oil emulsified drilling fluid, and further improve the sedimentation stability of the water-in-oil emulsified drilling fluid system.