17results about How to "Reduce fluid loss" patented technology

The invention relates to the technical field of thickening agents, in particular to a thickening agent for fracturing fluid and a preparation method of the thickening agent, the thickening agent comprises a liquid material and a solid material, the mass ratio of the liquid material to the solid material is 1: (2.2-2.4), and the liquid material is composed of deionized water and N-methyl pyrrolidone. According to the preparation method disclosed by the invention, the konjaku flour is added in the preparation of the thickening agent, and after the konjaku flour is subjected to mixing reaction and curing treatment, amino functional groups in konjaku molecules can be subjected to cross-linking reaction with aldehyde groups of glutaraldehyde, so that water molecules are wrapped in a cross-linked network structure, and the internal friction force during fluid flowing is increased; and hydroxyl groups on molecular chains of the konjac glucomannan and aldehyde groups of glutaraldehyde are subjected to a condensation reaction to form covalent bonds, so that a cross-linking effect is achieved, a stable chemical cross-linked network structure is formed among the molecular chains of the konjac glucomannan, and the cross-linking performance of the thickening agent is effectively improved.

The invention relates to the technical field of well killing fluids, and discloses a solid-free well killing fluid for oil and gas fields and a preparation method of the solid-free well killing fluid. The solid-free well killing fluid for the oil and gas field is obtained by stirring and mixing water, potassium formate, calcium chloride, gemini imidazoline quaternary ammonium salt modified polyacrylamide and pyridine sulfonate modified hydroxyethyl cellulose. Due to the imidazole ring, the benzene ring and the long-chain alkyl with relatively large steric hindrance, the rigidity of the polyacrylamide is enhanced, the curl of a molecular chain is weakened, the movement capability of the molecular chain segment at high temperature is reduced, and the high-temperature resistance of the well killing fluid is improved; the imidazoline quaternary ammonium salt group can be combined with clay mineral particles on the rock surface to form a compact adsorption layer, so that water in the well killing fluid entering the well wall is reduced, and the filtrate loss reduction performance is improved; a pyridine group and a sulfonic acid group which have relatively strong polarity and hydrophilicity are introduced into hydroxyethyl cellulose, so that the hydration dispersity, high temperature resistance and adsorption capacity of cellulose in the well killing fluid are improved, and the filtrate loss reduction performance of the well killing fluid is further improved.

The application discloses a drilling cementing wall stabilizing agent and a preparation method and application process thereof, and belongs to the technical field of oil field chemistry, and particularly relates to a preparation of the drilling cementing wall stabilizing agent. The preparation method of the drilling cementing wall stabilizing agent can be that thermoplastic resin, a curing agent and inorganic powder are uniformly mixed and stirred at normal temperature and normal pressure according to proportions. The wall stabilizing agent material has the advantages of simple production process, safety, low material cost and convenience for large-scale production and application. The product can not only plug pores and reduce filtration loss, but also cement sand and mudstone strata and improve stratum pressure-bearing capacity, so that the purpose of stabilizing a well wall is achieved. The application further provides an application process of the drilling cementing wall stabilizing agent, which comprises a suitable drilling fluid system and an adding amount and construction process under different stratum porosities and different working conditions.

This invention discloses a high-temperature resistant, high-density water-based drilling fluid for ultra-deep wells and its preparation method, belonging to the field of oil and gas drilling technology. The drilling fluid is composed of the following components in parts by weight: 100 parts water, 2-5 parts high-temperature resistant modified clay, 150-280 parts composite weighting agent, 8-15 parts high-temperature resistant polymer filtration loss reducer, 3-8 parts core-shell type high-temperature resistant flow modifier, 4-10 parts nano-composite plugging agent, and 2-5 parts high-temperature stabilizer. This invention effectively solves the technical problems of rheological runaway, increased filtration loss, and barite sedimentation in ultra-deep well high-density water-based drilling fluids under high-temperature conditions above 220℃ by utilizing the high-temperature expansion-disintegration mechanism of the core-shell type flow modifier, nano- to micron-level multi-stage plugging, and the close packing of spherical and irregular weighting materials. It exhibits temperature resistance up to 220℃ and a density of 2.80 g / cm³. 3 It has the advantages of low filtration loss under high temperature and high pressure and good sedimentation stability.

This application provides a battery and its housing assembly. The housing assembly includes a housing and an electrode assembly. The electrode assembly is mounted on the side wall of the housing and includes a connecting piece and a first insulating piece. The connecting piece is disposed inside the housing, and the first insulating piece is disposed between the connecting piece and the housing. The connecting piece and the first insulating piece together form a flow channel communicating with the interior of the housing. The first insulating piece has a first through hole communicating with the flow channel, and the side wall of the housing has a second through hole facing the first through hole. During subsequent processing of the battery, the connecting piece of the electrode assembly can block the electrolyte, reducing electrolyte loss during subsequent processing, thereby reducing the amount of electrolyte replenishment during secondary processing, lowering the battery production cost, and improving the quality of subsequent battery processing.

This invention discloses a modified bentonite drilling mud, its preparation method, and its application, belonging to the technical field of drilling mud and geotechnical engineering materials. The modified bentonite drilling mud disclosed in this invention, by mass parts, comprises: 100 parts sodium-based bentonite, 0.5 parts anhydrous sodium carbonate, 1-5 parts gum arabic, 0.1-2 parts xanthan gum, and 1000 parts water. The modified bentonite drilling mud disclosed in this invention solves the technical problem that existing drilling muds are unable to simultaneously meet engineering performance requirements, be environmentally friendly, and possess good salt resistance.

The invention provides a preparation method and application of sodium formate, and relates to the technical field of preparation of sodium formate materials. According to the invention, the purified sodium formate is obtained by improving the process, improving the impurity adsorption efficiency and introducing the modified activated carbon and the modified filter membrane, and is applied to the drilling fluid, so that various properties of the drilling fluid are improved.

The present invention relates to a high temperature resistant and low damage well killing fluid, comprising the following raw materials in parts by mass: 100-150 parts of water, 20-60 parts of composite salt, 1.6-2.5 parts of modified guar gum, 1-1.7 parts of plant alkyl polysaccharide, 2-3 parts of functional polymer, 0.02-0.04 parts of sodium fluorotitanate; the modified guar gum is obtained by reacting hydroxypropyl guar gum and polyethylene glycol diglycidyl ether; the composite salt is a compound of inorganic salt and organic salt; the inorganic salt does not include halogen salt. The well killing fluid of the present invention has a simple formula, uses a composite system of modified guar gum, plant alkyl polysaccharide and composite salt, is environmentally friendly and non-toxic, has good plugging performance, low filtration loss, avoids leakage damage to the reservoir, has high viscosity, adjustable density, can withstand 180°C high temperature aging, is biodegradable, has little pollution to the core, is a non-destructive or low-loss solid-free well killing fluid, and can be widely used in various oil wells.

This invention provides a method for preparing an emulsion-gel fracturing fluid and a solid proppant, as well as their applications. The method for preparing the emulsion-gel fracturing fluid includes: uniformly mixing epoxy resin, diluent, emulsifier, pH adjuster, and defoamer to obtain a mixture; adding water to the mixture while stirring to obtain an oil-in-water emulsion; adding a curing agent to the emulsion; heating and stirring; allowing sedimentation; ensuring the epoxy resin and curing agent are fully mixed and initially cured; then adding gel for crosslinking to obtain the emulsion-gel fracturing fluid; or adding a curing agent to the emulsion; stirring thoroughly; adding gels of different concentrations; stirring; and crosslinking to obtain the emulsion-gel fracturing fluid. The emulsion-gel fracturing fluid is heated to a curing temperature to generate a proppant. The emulsion-gel fracturing fluid of this invention has adjustable viscosity, low filtration loss, and can generate a solid proppant in situ under formation conditions, making it suitable for oil and gas field development. The generated proppant has high mechanical strength, good conductivity, and adjustable particle size.

The invention belongs to the technical field of oil exploitation, and particularly relates to solid-free high-density well killing fluid as well as a preparation method and application thereof. The well killing fluid comprises the following components in parts by mass (total 100 parts): 20-60 parts of potassium formate; 10 to 20 parts of a multifunctional tackifier; the rest is tap water; the molecular structural formula of the multifunctional tackifier is shown in the specification, and m is equal to 1000-10000; n is equal to 200 to 4000; and p is equal to 100 to 2000. The solid-free high-density well killing fluid disclosed by the invention has the advantages of high density, adjustable density, low corrosion rate, good anti-swelling effect and low damage to strata.

The invention provides a pH response type flow pattern regulator suitable for CO2 polluted drilling fluid as well as a preparation method and application of the pH response type flow pattern regulator. The pH response type flow pattern regulator is prepared from the following raw materials in parts by mass: 5 to 10 parts of acrylic acid, 10 to 20 parts of a pH response monomer, 10 to 30 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 to 20 parts of N-vinyl pyrrolidone, 0.1 to 1 part of an initiator and 100 to 200 parts of water. The flow pattern regulator disclosed by the invention can sense the pH value change of a drilling fluid system caused by CO2 pollution through a pH sensitive group in a molecular structure, and adaptively adjust the interaction strength with clay particles, that is, when the acidity is enhanced, the adsorption capacity is enhanced through group protonation, the aggregated clay particles are effectively dispersed, and the viscosity and shear force of the drilling fluid are reduced; in the pH value rising stage, the stability of the system is maintained through charge density regulation and control, and meanwhile, the filter loss is reduced by improving the mud cake structure.

This invention belongs to the field of petroleum extraction technology, specifically relating to a high-temperature, high-pressure kill fluid, its preparation method, and its application. The composition and mass fraction (total 100 parts) of the kill fluid are as follows: potassium formate 10-40 parts; barium sulfate 1-3 parts; polyacrylamide 0.05-0.1 parts; amphoteric guar gum 2-5 parts; the remainder is tap water; the molecular structure of the amphoteric guar gum is as follows: [Insert molecular structure formula here]. The kill fluid of this invention has the advantages of adjustable density, low corrosion rate, low API water loss, good anti-swelling effect, and low formation damage.

The invention discloses a preparation method of an environment-friendly salt-resistant and high-temperature-resistant filtrate reducer for a long open hole section. The preparation method specifically comprises the following steps: step 1, preparing a first mixed solution; step 2, preparing dispersion liquid; step 3, mixing the first mixed solution and the dispersion solution, and then shearing for 1-2 hours to obtain a shearing solution; step 4, adding the shear fluid into a reaction kettle, introducing nitrogen into the reaction kettle, discharging air in the reaction kettle, keeping the temperature at 70 DEG C, stirring for 10 minutes while keeping the temperature, adding an initiator, and stirring for 10-12 hours to obtain a reaction liquid; step 5, adding the reaction liquid into isopropanol according to a volume ratio of 1: 1.5, stirring for 40 minutes, standing for 2 hours, and filtering to obtain a reaction material; and step 6, washing the reaction material with absolute ethyl alcohol and methanol for 10 minutes respectively, and then drying to obtain the environment-friendly salt-resistant and high-temperature-resistant filtrate reducer for the long open hole section. The problem that an existing filtrate loss agent is poor in filtrate loss reduction performance in a long open hole section is solved.

The invention discloses a circular tube type diffuser and a design method, relates to the technical field of engine research, and aims to solve the problem that the safety performance of a turbine pump is reduced due to a diffuser in the prior art. The circular tube type diffuser comprises a ring inner cylindrical surface, a ring outer cylindrical surface and a plurality of target channels which are evenly distributed in the circumferential direction and extend from the ring inner cylindrical surface to the ring outer cylindrical surface in the radial direction. The cross section of each target channel is a circle, the center line of each target channel is a straight line, the target surfaces of the target channels are tangentially connected with the ring inner cylindrical surface, and the opposite surfaces of the target surfaces are tangentially connected with the ring outer cylindrical surface; an inlet transition section, a throat section and an expansion section are sequentially arranged in the multiple target channels in the direction from the ring inner cylindrical surface to the ring outer cylindrical surface. The expansion section is a beveled arc expansion section or a beveled spiral line expansion section; the expansion section is used for reducing liquid flow loss of an outlet of the diffusion channel and pressure pulsation of an inlet of the diffuser and an outlet of the turbine pump; therefore, the vibration level of the turbine pump is reduced, and the safety is improved.

The present invention relates to a device and method for oil well sand prevention using nitrogen foam. The device for oil well sand prevention using nitrogen foam comprises: a liquid nitrogen pump truck, a sand mixing truck, a sand-carrying liquid pump truck, a three-phase foam generator, a sliding wellhead, a casing, an oil pipe, a packer, a filling tool, a screen tube, a perforation, a thread plug, a sand wall and an artificial well bottom; the method for oil well sand prevention using nitrogen foam comprises the following steps: S1, preparation before construction, S2, nitrogen foam preparation, S3, wellhead pressure measurement, S4, pre-foam liquid injection and step-by-step sand addition, S5, displacement liquid injection, S6, pressure release and well shut-in pressure relief, S7, spraying and backwashing the well, S8, re-exploring the sand surface of the central pipe and pulling out the pipe column. The present invention can improve the sand carrying capacity of the foam sand-carrying liquid, reduce the filtration loss of the foam sand-carrying liquid and the amount of liquid used, increase the thickness and length of the sand wall, reduce the phenomenon of sand stripping and sand plugging, improve the viscosity of the sand-carrying liquid, achieve a uniform sand spreading effect, increase the liquid production, and extend the production cycle.

The invention relates to the technical field of cement paste, in particular to a nano styrene-butadiene latex flexibilizer and a preparation method thereof, and further comprises high-temperature-resistant and carbon dioxide corrosion-resistant cement paste and a preparation method thereof. The nano styrene-butadiene latex flexibilizer is prepared by the following steps: firstly, preparing a temperature-resistant monomer pre-emulsion and a toughening monomer pre-emulsion in advance; adding a part of the temperature-resistant monomer pre-emulsion and a part of the toughening monomer pre-emulsion into the molecular weight regulator solution to obtain emulsion seeds, then adding the balance of the temperature-resistant monomer pre-emulsion, the balance of the toughening monomer pre-emulsion and an initiator into the emulsion seeds for reaction, and finally, obtaining the temperature-resistant and toughening-type emulsion composite material. And washing, drying and crushing the obtained reaction product to obtain the nano styrene-butadiene latex flexibilizer. The high-temperature-resistant carbon-dioxide-corrosion-resistant cement paste can improve the strength of the first cementing surface and the second cementing surface of a well cementation cement sheath, reduce the permeability of set cement and prevent carbon dioxide from eroding the set cement.

The invention discloses a fluid loss additive for drilling fluid and a preparation method thereof, and relates to the technical field of fluid loss reduction of drilling fluid. The invention relates to a filtrate reducer for drilling fluid. Comprising the following components in percentage by weight: 7%-15% of acrylamide, 4%-8% of 2-acrylamide-2-methylpropanesulfonic acid, 4%-8% of N-vinyl pyrrolidone, 2%-6% of acryloyloxyethyl trimethyl ammonium chloride, 0.8%-1.6% of a phenolic aldehyde composite cross-linking agent, 0.2%-0.8% of a zircon salt cross-linking agent, 0.1%-0.6% of an initiator, 0.3%-0.9% of an emulsifier and the balance of water. 3%-8% of hybrid zirconium diboride whiskers, 6%-16% of polyvinyl alcohol and the balance of water. The filtrate reducer disclosed by the invention can be firmly adsorbed with clay particles, shows good high-temperature and high-salt resistance and filtrate reduction performance, can resist the temperature up to 220 DEG C, can resist NaCl to be saturated, can resist Mg < 2 + > up to 20000 mg / L or above, and can resist Ca < 2 + > up to 40000 mg / L or above.