11results about How to "Improve flowback rate" patented technology

This invention relates to the field of slickwater technology, specifically to a high-efficiency proppant-carrying slickwater. It comprises a shear-responsive smart thickener and inorganic salts dispersed in an aqueous phase; the smart thickener is composed of ABA-type temperature-ion dual-responsive block copolymers and nano-silica particles with surface-grafted hydrophobic alkyl chains and cationic groups. The slickwater of this invention exhibits ultra-low viscosity and high drag reduction during the pumping stage (low temperature, high shear); upon entering a fracture, the synergistic effect of temperature rise and instantaneous high-speed shear triggers hydrophobic association of the copolymer and interweaving of the nanoparticles, forming a three-dimensional network structure; under the low-shear environment within the fracture, the network structure self-reinforces through ordered reconstruction of ion pairs, achieving high-viscosity proppant carrying. Its core lies in transforming the inherent temperature rise and shear effects of the process into a driving force for constructing a proppant-carrying network, thereby effectively resolving the contradiction between low-friction pumping and high proppant carrying capacity in slickwater volumetric fracturing and significantly reducing reservoir damage.

The invention relates to the technical field of production increase of low-permeability oil and gas fields, and particularly provides an organic alcohol suspension resistance reducing agent for production increase and capable of quickly discharging water and preventing emulsification during oil stripping and a preparation method. The invention aims to solve the problems of quick water discharge and oil stripping emulsification prevention in the technical field of low-permeability oil and gas field yield increase. The resistance reducing agent comprises polyacrylamide, polymethacrylamide, an organic alcohol solvent, nano silicon dioxide, a silane coupling agent, a zwitterionic fluorocarbon surfactant and an organic thixotropic agent. The preparation method comprises the following steps: preparing intermediates A1 and B1, and mixing to obtain the final product. The problem of blockage of reservoir pores in fracturing operation is solved, the flowback rate is increased, and meanwhile, crude oil emulsification is avoided, so that the oil extraction rate is increased, and the corrosion of gathering and transportation pipelines is reduced.

The invention discloses an interface wetting regulator for tight gas reservoir water control fracturing and a preparation method of the interface wetting regulator. The preparation method comprises the following steps: S100, carrying out acidolysis on cellulose; s200, carrying out a hydrothermal reaction on the cellulose acidolysis product and a Gemini surfactant; and S300, compounding a quaternary ammonium salt cationic surfactant with a product obtained in the step S200 to obtain the interface wetting regulator for water control fracturing of the high-temperature and high-salt tight gas reservoir. The interface wetting regulator for water control fracturing of the high-temperature and high-salt tight gas reservoir, prepared by the preparation method provided by the invention, has multiple adsorption sites and high surface performance, is stronger in adsorption on the rock surface, has good wetting performance, and can convert a hydrophilic surface into a neutral wetting state and reduce the water phase permeability. Meanwhile, the surface tension is low, the flowback rate of fracturing fluid can be increased, and water control fracturing yield increase of tight gas reservoirs is achieved.

The present application provides a kind of coal bed gas U-shaped well straight well fast blowout method and device, the present application is by using soluble bridge plug fracturing and straight well blowout method, realizes first fracturing section first blowout, improves fracturing fluid flowback rate, reduces reservoir water sensitivity effect;The present application utilizes the height difference of landing point and docking point, further improves the ability of flowback fluid to carry solid residues in wellbore;The present application designs a storage tube, and the large particle residues that are difficult to carry to the ground during blowout are deposited in the storage tube, and after blowout is finished, it is fished to the ground by fishing tool, which realizes the purpose of fast blowout and wellbore cleaning.

The invention discloses a gas reservoir fracturing fluid rock modification system as well as a preparation method and application thereof, and belongs to the technical field of oil and gas reservoir fracturing fluids. The gas reservoir fracturing fluid rock modification system provided by the invention is prepared from the following raw materials in percentage by volume: 0.001 to 0.2 percent of rock modifier, 0.1 percent of cosolvent, 10 percent of mutual solvent, 0.1 percent of glacial acetic acid, 2 percent of cross-linking agent and the balance of water. According to the gas reservoir fracturing fluid rock modification system, hydroxyl groups on the surface of rock can be replaced by strong hydrophobic groups, the wetting angle of a rock interface to water is increased, and the flow-back efficiency of the gas reservoir fracturing fluid is greatly improved.

The present application discloses a surfactant for acid fracturing to improve oil recovery, and a preparation method and application thereof, which belongs to the technical field of surfactants for fracturing. The preparation method comprises the following steps: (1) dissolving monomer A and functional monomer in a first solvent, polymerizing under the action of an initiator to obtain a solution containing a prepolymer; (2) adding monomer B to the prepolymer, polymerizing again, and separating to obtain the surfactant. When the surfactant is used in acid fracturing fluid, it can form stable reticular micelles, improve its shear resistance and temperature resistance in the acid fracturing fluid, reduce the residue in the formation, and improve the flowback rate and sand carrying capacity.

The fracturing string capable of reducing the nitrogen foam fracturing friction resistance comprises a casing pipe, a safety connector, a hydraulic anchor and a packer are arranged in the casing pipe, the safety connector, the hydraulic anchor and the packer are sequentially connected through a tool string, the end, away from the hydraulic anchor, of the packer is connected with a horn mouth through the tool string, and the end, away from the hydraulic anchor, of the packer is connected with the horn mouth through the tool string. A sleeve head is arranged at the end opening, close to the safety connector, of the sleeve, and the other end of the tool string penetrates through the sleeve head. The invention further discloses a fracturing method, and the fracturing tubular column capable of reducing the fracturing friction resistance of the nitrogen foam and the fracturing method of the fracturing tubular column solve the problems that in the fracturing process in the prior art, the friction resistance is large, and the pressure borne by a casing head is insufficient.

The present application relates to the technical field of hydraulic fracturing method, and is an alternating pulse injection method for promoting proppant grouping, which comprises uniformly stirring A agent with proppant and injecting into the formation, and B agent is a slow-release promoter which is injected into the formation together with fracturing fluid in the preflush and mid-top fluid stage. The alternating pulse injection method for promoting proppant grouping can improve single well production by 20% to 90%, eliminates the loss of flow conductivity caused by residue blockage and proppant embedding, thereby reducing the pressure drop funnel effect near the wellbore and improving the fracturing reconstruction effect; and a centimeter-level high-flow channel is established, which greatly improves the flowback rate and flowback speed and reduces the risk of sand plugging during construction.

The present application discloses a slippery water fracturing fluid and its preparation process and fracturing process, belonging to the technical field of fracturing fluid for oil fields. The slippery water fracturing fluid is composed of 0.4-0.9% drag reducer, 0.1-0.2% salt, 0.5-1.0% clay stabilizer, 0.05-0.2% bactericide and the balance is water. The slippery water fracturing fluid of the present application adopts a new type of drag reducer, which can improve the salt tolerance of the fracturing fluid, thereby improving the oil displacement rate while improving the drag reduction rate, thereby achieving the purpose of increasing production.