50results about How to "Good profile control effect" patented technology

The invention relates to a gas self-production system used for plug removal and energy increase of an oil-water well and an application method thereof. The gas self-production system comprises, by weight, 3-10% of urea, 5-25% of a nitrite, 5-25% of an activator and 40-85% of water. The nitrite is one of sodium nitrite, ammonium nitrite and potassium nitrite. The activator is one of methyl formate, ammonium amidosulfonate, ammonium-monochloracetat, hexamethylenetetramine and formaldehyde. When the gas self-production system is used, the above materials are mixed at ambient temperature under ambient pressure, and injected into oil-bearing strata having a temperature higher than 50 DEG C, so as to remove plug, increase energy and increase enhance rate. The gas self-production system can be applied for plug removal and energy increasing of low-pressure low-energy wells in an oil field scattered reserve unit.

The invention discloses a thick oil activating agent and a preparation method thereof. The thick oil activating agent is a polymer with the structure formula shown as a formula (1). In the formula (1), x, y, z, m and n are respectively mass percentage of the corresponding chain sections in the polymers; the m is between 0.75 and 0.85; the y is between 0.020 and 0.24; the x, the z, and the n are respectively between 0.001 and 0.01; the p is a natural number between 2 and 9. The activating polymer provided by the invention has the effects of enhancing the water phase viscosity and reducing the crude oil viscosity, and can be used as a displacing agent and a viscosity reducer to realize the integration of the displacing agent and the viscosity reducer. The activating polymer can enhance the water phase viscosity; the displacing function is realized; the emulsion dispersion of crude oil can be realized; the mixed phase flowability is enhanced; in addition, the dispersed crude oil and the non-contact crude oil continuously act; meanwhile, the water phase acts with both the mixed oil phase and the new oil in a continuously following way; more crude oil is continuously started. The activating polymer provided by the invention has low interface tension and has certain oil washing capability.

The invention relates to an environmental-friendly organic profile control agent. The environmental-friendly organic profile control agent comprises partially hydrolyzed polyacrylamide, a crosslinking solution, a ternary metal compound particles, an accelerant, additives, modified bentonite, auxiliaries, a complexing agent, polymetal silicate and water. The invention further provides a preparation method and use of the profile control agent. According to the profile control agent provided by the invention, the most excellent performances are obtained by proper selection of the components, a unique process of the preparation method and the like, so that the profile control agent has good application prospect and industrial potential in the field of petroleum industry.

The invention discloses an inorganic gel profile control technology. Various profile control water shutoff agents are used and comprise a weak gel profile control agent, an inorganic gel profile control agent, a pre-crosslinking particle profile control agent and an oil-displacing agent, wherein the weak gel profile control agent comprises cross-linked polymers HPMA (hydroxypropyl methacrylate), a cross-linking agent, a stabilizing agent and a delay agent; the cross-linked polymers HPMA are partially hydrolyzed polyacrylamides; the cross-linking agent is a composite system of formaldehyde and resorcinol; the inorganic gel profile control agent is an inorganic mixing body using metasilicic acids as main ingredients and is matched with the pre-crosslinking particle profile control agent to be used in the profile control process; the pre-crosslinking particle profile control agent is a synthetic flexible macromolecule material containing a great number of hydrophilic groups; and the oil-displacing agent is a surfactant with amphiphiles. The inorganic gel profile control technology has the advantages that various profile control water shutoff agents using the inorganic gel as a main body extend to the inside of an oil reservoir to block a high-permeability zone, so that the direction of fluid is converted; injected water affects medium-low-permeability zones which are not affected in the prior art; the displacement effect is improved; and the recovery ratio is improved.

The invention relates to a fractured reservoir profile control process. The process includes the steps: firstly, injecting a zwitterionic polymer solution slug into a reservoir; secondly, using a zwitterionic gel profile control agent to suspend and carry retarding salt-resistant high-strength water-absorbent resin particles, and injecting into reservoir fractures; thirdly, injecting 40m<3> of acrylamide gel to block the ends of the fractures; fourthly, using clay adhesive to suspend water-insoluble solid particles, and injecting into the fractures; fifthly, alternatively injecting part of a hydrolysis polyacrylamide solution and a petroleum sulfonate surfactant solution. By the process, damage to small fractures and matrix pores is reduced, performance of the profile control agent in large and intermediate fractures is ensured not to be reduced, swept volume and displacement efficiency of injected fluid in a large-intermediate fracture lateral reservoir are increased, and profile control effect is achieved finally.

The invention discloses a method and device for determining the profile control amount of a water injection well and relates to the field of petroleum reservoir exploitation. The method for determining the profile control amount of the water injection well comprises the following steps that the profile control thickness is determined according to water injection profile test data and well logging interpretation data; based on a distance between an oil extraction well and the water injection well, the basic profile control radius is obtained; according to tracer agent data and the basic profile control radius, profile control radius is obtained; a profile control area coefficient is determined according to the profile control direction situations of the oil extraction well and the water injection well; the profile control agent injection amount in the predetermined direction is obtained based on the profile control thickness, the profile control radius, the profile control area coefficient, the profile control direction number and the communication direction number; the total profile control agent injection amount is obtained according to the profile control agent injection amount in the predetermined direction. The method for determining the profile control amount of the water injection well can optimize profile control areas in all directions according to the situations of the oil extraction well and the water injection well, optimize effective injection pore volume and further determine the optimal profile control amount.

Disclosed are a heavy oil activator, a preparation method and use thereof. The heavy oil activator has a structural formula shown in Formula (1). In Formula (1), x, y, z, m, and n are respectively mass fractions of corresponding chain segments in the polymer, m being 0.75-0.85, y being 0.20-0.24, and x, z, and n all being 0.001-0.01; and p is a natural number between 2 and 9. The activating polymer provided has the effects of increasing viscosity of an aqueous phase while reducing viscosity of crude oil, and can serve both as a displacing agent and a viscosity reducer to realize integration of the two agents. The activating polymer can increase viscosity of an aqueous phase, has a displacement effect, can emulsify and disperse crude oil, and increase fluidity of a mixed phase; the dispersed crude oil continues to interact with crude oil that has not contacted the polymer, and the aqueous phase interacts with the mixed oil phase as well as new oil, by way of which continuous interactions, more crude oil can be constantly produced. The activating polymer has a relatively low interfacial tension and exhibits a certain degree of oil washing capability.

The invention relates to the technical field of oilfield chemistry and oil extraction, and discloses an oilfield profile control agent and a preparation method thereof. The oilfield profile control agent comprises the following components in parts by mass: 28-62 parts of polyester polyol, 4-42 parts of hexamethylene diisocyanate, 2-41 parts of chloroprene rubber, 0.01-3 parts of a catalyst, 2-45 parts of a blocking agent, 1-31 parts of a solvent and 1-20 parts of a plasticizer. A polyurethane prepolymer is prepared by the polymerization of the polyester polyol and the hexamethylene diisocyanate, and then a blocking reaction is carried out on the blocking agent with the polyurethane prepolymer, the solvent, the chloroprene rubber, the plasticizer and the catalyst, so that the oilfield profile control agent provided by the invention is obtained. The product is in a liquid state at normal temperature, can fully enter into the deep micro pores of a stratum, and gels and expands in the stratum; the gelling temperature is controllable, so that the diversion function of the profile control liquid flow of a deep oil reservoir can be realized; the flood conformance volume is increased; thewater flooding effect is improved; and the recovery efficiency is improved.

The invention provides a method and a device for performing on-line profile control on a polymer driving oil field by applying a crosslinking agent. A device for uniformly mixing a polymer solution and a crosslinking agent solution on line is applied; the components of the crosslinking agent solution are adjusted to consist of 1.5 to 2.5 wt percent of formaldehyde, 0.2 to 0.8 wt percent of ammonium chloride, 0.02 to 0.2 wt percent of resorcinol and the balance of water; a phenomenon that the viscosity of the polymer solution is reduced because of shearing can be effectively prevented; preferable profile control and driving control effects on an oil layer can be achieved; and furthermore, the method is easy to operate, convenient to use and transport and low in cost.

The invention belongs to the technical field of oil reservoir exploitation, and more specifically relates to a method used for evaluating particle size distribution of polymer microspheres, and a method used for evaluating oil reservoir adaptability of polymer microspheres. The method used for evaluating particle size distribution of polymer microspheres comprises following steps: 1, the number and the particle size of polymer microspheres in a certain area are calculated so as to obtain the largest particle size and the smallest particle size; 2, the obtained data is divided into a plurality of groups, and class interval width is calculated; 3, the limit of each group is calculated; 4, the frequency of the data of each group is calculated, and the frequency of each group is calculated; and 5, a microsphere particle size distribution curve is drawn. According to the method used for evaluating oil reservoir adaptability of polymer microspheres, evaluation of the oil reservoir adaptability of the polymer microspheres is carried out based on the matching relationship of the microsphere with pore size, core of different permeability is selected to measure the resistance coefficient and the residual resistance factor of the microspheres in passing through the core, if the microspheres are capable of entering core pores and performing transmission transporting, and the injection pressure increases firstly and then becomes stable, the geometric size of the microspheres matches the geometric size of the core pores, and the core permeability can be taken as the microsphere permeability extreme.

The invention provides a non-resin type profile control agent and an application thereof in oil exploitation. The profile control agent comprises components in percentage by weight as follows: 1%-10% of drilling cuttings, 0.1%-0.5% of a suspending agent, 0.1%-0.4% of a dispersing agent, 0.1%-0.5% of a curing agent and 84.1%-98.6% of water, wherein the suspending agent is an organic polymer, and before usage, drilling slurry with the solid content of 15wt%-20wt% is firstly prepared from the drilling cuttings and the water. The non-resin type profile control agent containing the drilling cuttings has good profile control performance and is simple and convenient to use.

The invention provides an aldehydic hydrogen-based self-crosslinking polyacrylamide which is prepared through aqueous solution polymerization or emulsion polymerization. The aldehydic hydrogen-based self-crosslinking polyacrylamide has a structural formula as described in the specification; in the formula, R1 is a group containing aldehydic hydrogen, a group with its end group being phenol or CHO and R2 is a group with its end group being phenol, a group containing aldehydic hydrogen or CHO. A preparation method for the aldehydic hydrogen-based self-crosslinking polyacrylamide comprises the following steps: adding acrylamide, N-hydroxymethyl-phenol-carbonyl acrylamide, N-hydroxymethyl acrylamide and deionized water into a reaction kettle, blowing nitrogen gas into the kettle for 25 to 35 minutes, carrying out uniform stirring, adding an initiator, carrying out initiated polymerization at a temperature of 25 to 30 DEG C for 6 to 8 hours, then carrying out a reaction at a temperature of 40 to 60 DEG C for 55 to 65 minutes and carrying out drying and granulation so as to obtain the aldehydic hydrogen-based self-crosslinking polyacrylamide. The aldehydic hydrogen-based self-crosslinking polyacrylamide provided in the invention has the characteristics of a single product, convenient construction, low cost, stable gelation, controllable gelation time, a good profile control effect, capacity of self-crosslinking, safety and convenience in usage, etc., and is widely used in the process of polymer injection in oil exploration.

The invention provides a peptidomimetic surfactant backflow fracturing fluid-based modifying and flooding agent and a preparation method thereof. The peptidomimetic surfactant backflow fracturing fluid-based modifying and flooding agent is prepared from the following components in percentages by weight: 0.2-1% of a peptidomimetic surfactant backflow fracturing fluid, 0.001-0.05% of a cosurfactant, 4-15% of modifying and flooding particles and the balance of oilfield injection water. The peptidomimetic surfactant backflow fracturing fluid-based modifying and flooding agent is clean and environment-friendly and can be applied to tertiary recovery, and the residual backflow fluid on a well site is avoided. The peptidomimetic surfactant backflow fracturing fluid-based modifying and flooding agent is suitable for an oil well reservoir, and green and environment-friendly production and sustainable development of a gas field are ensured by using the technology in downhole construction work; and the research result has obvious economic benefits and important social benefits, and has great popularization and application prospects.

The invention provides a resin plugging agent based on emulsion deformation and a preparation method and application of the resin plugging agent. The resin plugging agent comprises an epoxy resin system, an emulsifier system and a saline water system, 40% of an epoxy resin system; 10% of an emulsifier system; brine system 50%. The invention also relates to a preparation method and application of the resin plugging agent. The resin profile control system based on emulsion deformation is used for profile control operation of fractured reservoirs. The invention has the following advantages: at room temperature, the system is a stable resin-in-water emulsion, has low viscosity, and has good injectivity; at a high temperature, the system is reversed into a water-in-resin emulsion, and the curedsystem has high overall strength and a good profile control effect.

The invention relates to a xanthan gum-based profile control agent for oil exploitation and a preparation method thereof, and application of a xanthan gum-based profile control agent for oil exploitation. The xanthan gum-based profile control agent is prepared from the following raw materials in parts by weight: 50-90 parts of xanthan gum, 5-45 parts of guar gum, 1-3 parts of binary acid and 1-5 parts of sodium sulfite. The temperature resistance of the profile control agent is up to 110 DEG C, and the salt resistance of the profile control agent is up to 100,000 ppm. The profile control agenthas long-term stability in a high-temperature state as an oil extraction aid, and the average viscosity loss rate is 20% or below after 6 months under the condition of the temperature of 100 DEG C.

A biological self-healing deep profile control slug combination comprises biological slugs, a biopolymer cross-linking system slug, a chemical polymer cross-linking system slug and isolation slugs.The biological slugs comprise microorganism living bodies, a biopolymer and a fermentation nutritional agent.A using method of the biological self-healing deep profile control slug combination comprises the steps that injection is carried out at the low injection speed lower than the water injection amount, and front-end slugs, middle slugs and a tail slug are injected in sequence; the front-end slugs include the corresponding biological slug and the corresponding isolation slug; the middle slugs include the biopolymer cross-linking system slug, the corresponding isolation slug, the corresponding biological slug and the corresponding isolation slug in sequence; the tail slug is the chemical polymer cross-linking system slug, and plugging near a wellbore is carried out.According to the biological self-healing deep profile control slug combination and the using method thereof, the oil deposit shearing resistance is good, the glue forming quality is high, and the profile control effect is good; the deep profile control radius is large, and water injection winding streaming is effectively avoided; all the slugs are reasonably combined, and can carry out biological regeneration self-repairing in a staged mode, the service life of a total slug is effectively prolonged, and the validity period is long.