5 results about "Polyamine Inhibitor" patented technology

The invention discloses an amine-terminated acrylamide polymer shale inhibitor and a preparation method thereof. Polymeric monomers of the inhibitor comprise an acrylamide monomer A, N, N-dimethylacrylamide, acryloyl morpholine and an amino thiol monomer. The acrylamide monomer A is selected from at least one of methacrylamide, isopropyl acrylamide and acrylamide; the amino thiol monomer is selected from at least one of cysteine and homocysteine. The synthesis process is simple and efficient, the cost is low, and the prepared polyamine inhibitor is high in shale hydration inhibition, stable in performance under the high-temperature condition and good in compatibility.

The invention discloses a reservoir drilling fluid and a preparation method thereof, and belongs to the technical field of oilfield chemical agent preparation, the reservoir drilling fluid comprises the following substances by weight: 50-80 parts of water, 3-5 parts of a flocculant, 2-8 parts of a polyamine inhibitor, 2-4 parts of an anti-scale agent, 1-3 parts of graphite, 4-6 parts of a mixed additive, and 1-3 parts of xanthan gum; the preparation method of the mixed additive comprises the following steps: S1, preparing alkyl glycoside and a pH adjusting solution with the concentration of 0.8-1.2% according to the mass ratio of 1: 2, mixing the alkyl glycoside and the pH adjusting solution, stirring for 20-35 minutes at the temperature of 45-55 DEG C, then adding calcium formate, and stirring to obtain a primary mixture; by preparing the mixed additive prepared by mixing substances such as alkyl glycoside and sodium nitrohumate, the drilling fluid finished product can effectively reduce the damage of a coalbed methane reservoir caused by solid phase invasion, prevent mineral hydration, promote desorption of coalbed methane on the surface of coal rock, and maintain the stability of the coalbed at the same time.

The present disclosure provides compositions comprising a polyamine synthesis inhibitor, a tyrosinase inhibitor and a corticosteroid, for reducing excess pigmentation. Also provided herein are methods of reducing excess pigmentation in a subject, comprising administering a composition comprising a polyamine synthesis inhibitor, a tyrosinase inhibitor and a corticosteroid to the subject, and uses of the claimed composition. In some examples, the polyamine inhibitor is an ornithine decarboxylase (ODC) inhibitor such as eflornithine (DFMO).

The application discloses an oil-gas field drilling polyamine drilling fluid and a preparation method and application thereof, relates to the technical field of oil-gas field drilling, and the polyamine drilling fluid is prepared from the following raw materials in the total volume of 100 mL of water: 1.0-2.0 g of bentonite, 0.2-0.3 g of a tackifier, 0.2-0.4 g of an alkalinity regulator, 0.1-0.2 g of a coating agent, 3.0-4.0 g of a nano fluid loss additive, 3.0-4.0 g of a lubricant, 5.0-6.0 g of a polyamine inhibitor, 6.0-8.0 g of an inorganic salt, and a weighting material, wherein the density of the polyamine drilling fluid is 1.5-1.8 g / cm 3 . The polyamine drilling fluid has good rheological property, strong inhibitory property and lubricating property, can keep the well wall of a shale formation stable for a long time, reduce the drilling friction of the shale formation, has good biodegradability and meets the environmental protection requirements.

The invention discloses a preparation method of an asphalt-based shale inhibiting and blocking agent for well drilling, and relates to the technical field of oil and gas reservoir development, and the preparation method comprises the following steps: S1, crushing composite asphalt to be less than 5mm, melting under the protection of nitrogen, and performing high-speed shearing to form a homogeneous asphalt matrix; s2, sequentially adding modified nano calcium carbonate and a polyamine inhibitor, and uniformly stirring; then adding a salt-resistant surfactant and an antioxidant, and continuously stirring uniformly to form asphalt functional paste; s3, cooling the asphalt functional paste, slowly adding a preheated solvent, and emulsifying at a high speed; after emulsification is completed, paste is guided into a double-screw extruder to be extruded into particles, after freeze drying, the particles are fed into a jet mill to be smashed, and the asphalt-based shale inhibiting and blocking agent for well drilling is obtained. The product provided by the invention has high-temperature stability, efficient plugging performance and environmental friendliness.