53results about How to "Improve displacement efficiency" patented technology

The invention relates to a method of displacing oil by anionic-cationic composite surfactant and mainly solves the problems that the prior method of displacing oil by surfactant is low in oil displacement efficiency in tertiary oil recovery and an oil displacement system containing inorganic base is harmful to stratums and oil wells, corrosive to equipment and pipelines and difficult for demulsification. According to the technical scheme, crude oil is allowed to contact with oil-displacing agent, and the oil-displacing agent comprises, by weight percent, 0.01-5.0% of anionic-cationic composite surfactant, 0.01-3.0% of polymer, and 92.0-99.98% of injected water. The problems are solved well. The method is applicable to tertiary oil recovery for oil fields.

The invention relates to a long-acting mixed fluorocarbon surfactant treating agent for improving the condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent. The mixed fluorocarbon surfactant treating agent comprises the following components in parts by weight: 0.05-0.3% of nonionic fluorocarbon surfactant, 0.05-0.3% of zwitter-ion fluorocarbon surfactant, 0.05-0.3% of nonionic hydrocarbon surfactant, 5-30% of alcohol, and the balance of water. The mixed fluorocarbon surfactant treating agent is capable of forming a compact adsorption film on the rock surface to construct a good airflow channel, the gas phase permeability of a stratum is improved, the displacement efficiency of the gas drive is obviously improved, and the validity is long. The invention further provides the application of the mixed fluorocarbon surfactant treating agent, the mixed fluorocarbon surfactant treating agent is applied to the condensate gas reservoir, the water blocking is prevented, the recovery efficiency is improved, the injection amount injected into rock core or stratum is 0.2-0.4PV, and the gas drive recovery rate can be improved to 40-78% under different temperature.

The invention provides a thin and shallow layer super heavy oil horizontal well, viscosity reducer, nitrogen and steam assisted huff and puff method, and belongs to the technical field of oil field production. The method includes the steps of firstly, drilling holes in a horizontal well; secondly, filling an oil pipe with oil-soluble viscosity reducers, closing a sleeve valve, and continuing to fill a well shaft with the oil-soluble viscosity reducers; thirdly, filling an oil sleeve with nitrogen in an annulus mode; fourthly, filling the oil pipe with steam through a filling and production integrated pipe column; fifthly, conducting soaking for 2 hours to 4 hours; sixthly, controlling flow opening through an oil nozzle when the pressure of a well opening falls to 0.5 MPa/d; seventhly, starting the pumping when conducting flow opening to the liquid amount of 3t/d. By means of the composite heavy oil development mode integrating the horizontal well, the viscosity reducers, the nitrogen and the steam, by means of the comprehensive effect of all elements, the steam swept volume is remarkably improved, the viscosity of crude oil is reduced, the energy of a stratum is compensated for, the steam filling pressure is reduced, the steam overlapping is avoided, the thermal loss of the stratum is reduced, and the oil driving efficiency and crude oil flowing capacity are improved.

The invention relates to a novel method capable of improving deep super-thick oil reservoir recovery efficiency. According to the method, in the steam huff and puff and steam flooding processes, a water-soluble nano-catalyst is injected to make the viscosity of super-thick oil under the condition of an oil reservoir be reduced substantially, as a result, the fluidity of the super-thick oil under the condition of the oil reservoir is improved, the shortcomings that a deep super-thick oil reservoir is high in steam injection pressure and low in well bottom steam dryness are effectively overcome, steam injection quantity also can be reduced, and the purpose of economical and efficient development of the deep super-thick oil reservoir is achieved. On the basis of steam huff and puff and steam flooding, the method of improving deep super-thick oil reservoir recovery efficiency can reduce the velocity of crude oil by more than 80%, increase the recovery percent by about 15%, and increase the gas-oil ratio in a huff and puff well period by 0.15.

The invention provides a multifunctional nano-viscosity reduction profile control agent, relating to an additive for thick oil exploitation in the chemical field of oil exploitation and a use method thereof. The agent disperses the continuous thick oil to an oil-in-water oil block by a low interfacial tension mechanism, and has the characteristics of high viscosity reduction rate, dispersed system while flowing, layering while being still, no influence on emulsion breaking, small use concentration and great economical feasibility. The technique combines the viscosity reduction, the profile control with displacement of reservoir oil, which can not only reduce the viscosity of the thick oil and regulate a water absorption profile, but also improve the efficiency of the displacement of reservoir oil, therefore, the integration of displacement and control is realized so that the technique is an organic combination of secondary oil recovery and tertiary oil recovery as well as has remarkable comprehensive economic benefit. By adding an assistant agent of a foaming agent, the method increases fluid film strength, prolongs foaming half life period, enhances foaming stability and sufficiently solves the problems of high viscosity of the thick oil and difficult development in the process of oilfield development and exploitation; the characteristics of nano-particles are utilized to exert cooperative effect between the agents to the maximum extent so as to realize the objective of viscosity reduction, profile control and efficiency increase.

The deep wood chip gel plugging agent is used in water injecting well to plug the high penetrating band in thick oil stratum to lower ineffective water circulation. The deep plugging agent consists of high molecular weight anionic polyacrylamide of molecular weight over 19 million and hydrolysis degree of 25-30 % 0.15-0.5 wt%, phenol compounded polyamine 0.1-0.3 wt%, resorcinol 0.01-0.02 wt%, oxalic acid 0.1-0.2 wt%, wood chip 0.5-2.5 wt% and water 96.48-99.14 wt%, which are compounded into water solution of 0.86-3.52 wt% water solution. The present invention has low use concentration, controllable gel forming time and viscosity, low cost and simple compounding process.

The invention relates to a water-gathering co-well layering co-charging process tubular column, which mainly solves the problem that the oil field injection well exploitation way of the existing oil field process tubular column severely influences the yield of the oil field and is violently subjected to the influence of the thickness of an isolation layer. The water-gathering co-well layering co-charging process tubular column is characterized in that an annular space between a casing pipe (1) and an outer layer oil pipe (2) is divided by a plurality of washable well-passing cable packers (10) into different positions, an inner layer oil pipe (3) is arranged inside the outer layer oil pipe (2), the an insertion sealing device (5) is arranged between the bottom end of the inner layer oil pipe (3) and the outer layer oil pipe (2), an eccentric injector (4) is arranged in the position on the upper part of the insertion sealing device (5), and an eccentric water allocator (6) is arranged in the position on the lower part of the insertion sealing device (5). By adopting the water-gathering co-well layering co-charging process tubular column, the co-well subsequent water flooding and polymer flooding can be simultaneously carried out after the polymer flooding upward movement is realized, both the water flooding and the polymer flooding are respectively injected in a layering manner, the exploitation effect is improved, and the influence of the thickness of the isolation layer can be avoided.

The invention discloses an intelligent inflow gas control device which mainly comprises a flow chamber, pressure guide holes, inlet oil nozzles, a packet, a sawtooth-shaped movable component and turn-off structures. The maximum quantity Q <max> of gas which is allowed to flow through the inlet oil nozzles can be set according to actual production requirements on oil wells. The intelligent inflow gas control device can normally work when the quantity Q of the gas which flows through the inlet oil nozzles does not exceed the set maximum quantity Q <max> of the gas; the intelligent inflow gas control device is turned off when the quantity Q of the gas reaches the set maximum quantity Q <max> of the gas, and fluid is no longer allowed to flow through the intelligent inflow gas control device. A working principle for the intelligent inflow gas control device includes that the gas can critically flow in the inlet oil nozzles when the flow rates of the gas in the inlet oil nozzles reach the maximum quantity Q <max> of the gas; ratios of front-end pressures P1 to rear-end pressures P2 of the inlet oil nozzles are critical pressure ratios, and the intelligent inlet gas control device can be turned off under the control of the critical pressure ratios. The intelligent inflow gas control device has the advantages that the intelligent inflow gas control device can be applied to gas-top reservoirs and gas injection production straight wells, horizontal wells and inclined wells, specified gas quantity exceeding gas flow channels can be timely closed, accordingly, economic benefits of oil fields can be increased, and the recovery ratios of oil reservoirs can be increased.

The invention provides a surfactant composition, which is prepared from alpha-alkenyl sulfonate, alkyl dimethyl betaine, partially hydrolyzed polyacrylamide and alkanolamide. According to the surfactant composition, the temperature resistance and the salt resistance are remarkably improved, the adsorption on oil reservoir rocks is reduced, and a system has high displacement efficiency, so that thepurpose of further improving the crude oil recovery ratio is achieved.

The invention relates to a passive type multifunctional well head backflow dredging compensating device for petroleum industry, mainly comprising a separating backflow assembly and a medicament carrying unit, wherein the separating backflow assembly mainly comprises a well fluid separating unit, a filter, a sand and water storage chamber and a backflow flow rate control unit; the medicament carrying unit mainly comprises a medicament carrier, a medicament can and an air balancing connection pipe, wherein the medicament carrier is respectively communicated with a fluid returning pipe and the medicament can; and after well fluid is separated and filtered by the separating backflow assembly, a part of polluted water enters the medicament carrier through a well fluid backflow pipe column along the fluid returning pipe and is mixed with medicament inside the medicament can by a water power spray principle to flow back to a passage dredging submergence depth air in an oil sleeve ring in the air. The invention reduces the resisting force of the air which upwards flows from submergence depth, prevents the air reversely entering an electric pump, ensures the separating effect of an electric pump separator, prolongs the exemption period of an electric pump well and saves a great amount of operation expense and operation time.

The invention discloses an oil displacement type fracturing fluid system and a preparation method thereof, and belongs to the field of oilfield chemistry. The oil displacement type fracturing fluid system is composed of the following components in percentage by mass: 0.25-0.3% of guanidine gum; 0.5-0.8% of a surfactant with ultralow interfacial tension; 1.0-3.0% of potassium chloride; 0.1-0.5% of a bactericide; and the balance of water. The oil displacement type fracturing fluid system aims at an oil well subjected to water injection development, the oil displacement type fracturing fluid system is diffused into a water displacement channel during repeated transformation, a certain displacement (washing) characteristic is achieved during flow-back, and the oil washing efficiency of a gel breaking fluid of the fracturing fluid during repeated fracturing of an oil reservoir subjected to water displacement development is improved. The preparation method comprises the following steps: mixing the guanidine gum, the surfactant with ultralow interfacial tension, the potassium chloride, the bactericide and the water, and uniformly stirring to obtain the oil displacement type fracturing fluid system. The preparation method is simple, on-site rapid preparation is easy, use is convenient, and on-site construction is safe.

The embodiment of the invention discloses a well pattern system and a construction process of the well pattern system and belongs to the technical field of oil and gas exploitation. The well pattern system comprises a production well penetrating through a plurality of to-be-developed layers of a reservoir and multiple injection wells, wherein a polygon is defined by the multiple injection wells, the production well is located in an area defined by the multiple injection wells, each injection well is a vertical well, each injection well penetrates through at least one to-be-developed layer, and each injection well extends in the penetrating to-be-developed layer to form a first crack section; and the distance from each injection well to the production well in the layer to be developed is greater than the minimum distance from the first crack section of the corresponding injection well to the production well. The well pattern system is advantaged in that when the gas is injected through the injection well, the gas can be diffused in a large range in the to-be-developed layer based on the first crack section, so seepage resistance of the gas in the to-be-developed layer is remarkably reduced, displacement efficiency of the gas to petroleum is improved, and the oil and gas exploitation efficiency is improved.