10results about How to "Reduce fluid loss" patented technology

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.

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.