86results about How to "Enhanced ultimate recovery" patented technology

The invention discloses an exploitation method for a wax precipitation oil reservoir. The method comprises the step of adding a chemical agent and thermal fluid into an oil layer to make crude oil in the oil layer smoothly seep into an oil well and then rise to the ground surface. The method has the advantages of effectively solving the problem of wax precipitation of the crude oil in the oil layer and exploiting the wax precipitation oil reservoir, greatly reducing the exploitation cost of the wax precipitation oil reservoir, prolonging the production period and increasing the yield of the oil well and enhancing the final recovery efficiency of the oil reservoir, along with easy implementation, safety and reliability and obvious economic benefit.

The invention discloses an exploitation method of a thick oil type oil deposit, which comprises the following steps of: adding a chemical agent and hot fluid into an oil layer, enabling crude oil in the oil layer to be successfully seeped to an oil well and then enabling the crude oil to be raised to the ground from the inside of the oil well. The invention has the following advantages that: the invention can effectively solve the problem of phase precipitation of the asphaltene of the crude oil in the oil layer, can effectively exploit the thick oil type oil deposit, lowers the exploitation cost of the thick oil type oil deposit greatly, prolongs the production period of the oil well, increases the yield of the oil well, enhances the final recovery ratio of the oil deposit and has easy execution, high safety and reliability and obvious economic benefit.

A high-efficiency pour point depressant for thermal recovery process comprises (1) biphenyl, polycyclic aromatic hydrocarbons or polycyclic aromatic hydrocarbon derivatives free of chlorine and sulfur elements; (2) liquid petroleum products containing arene larger than 5%, petroleum resin in liquid state at normal temperature or natural hydrocarbon aggregates in particle state at normal temperature; (3) surfactant; (4) fusel oil; (5) alcohol ethers having a closed cup flash point larger than 20 DEG C; and (6) oil-soluble or water-soluble polymers respectively having a nonpolar section eutectic with paraffin molecule and a polar section for twisting crystal form of wax crystal on a main chain and/or a branch chain. The high-efficiency pour point depressant of the invention performs all functions of both water-base pour point depressant and oil-base pour point depressant, and can efficiently assist the prior various thermal recovery processes in exploring high pour-point oil and heavy oil reservoirs, with the advantages of greatly reduced exploitation cost, prolonged production cycle of the oil well, increased output of the oil well, increased ultimate recovery of the oil reservoir,as well as significant economic benefit.

The invention discloses a numerical analysis method applied to a leaking and channeling mechanism and a prevention and control method of an injection fluid. The method is used for carrying out research based on the fluid-solid coupling theory by virtue of a method with combination of indoor test, numerical calculation and field detection. By virtue of the method, typical mudstone is selected for carrying out indoor test under different water ratios and building an inversion model of stress and deformation of a point-changeable stratum of an inversion sleeve of deformation data of a sleeve. On account of a typical injection-production scheme, the accurate positions of leakage, interzone and flowing along fault are judged and optimized by comparing the numerical simulation and the field detection; finally, a reasonable injection-production scheme and a reasonable measure for preventing serious loss of injection water are provided; and the method has important application values of improving the injection-production effect of the oil field and improving the final recovery rate and the whole development level of the oil field.

The invention discloses a large-curvature radioactive level horizontal drilling process and device includes drilling vertical well to oil layer, lowering the sleeve, drilling sleeve shoe, building up angle directionally, washing well, lifting the drill, lowering special sieve vessels, filling with gravels, decoupling the hanger for circulated well washing, lifting the hanger de-coupler and all drilling tools above, drilling other radial wells, etc. Through drilling a plurality of radial wells, the invention enlarges seepage area, expanding seepage range, increasing the daily production for single well and raises final recovery ratio, so as to achieve the purposes of making full use of energy, increasing economic benefits and benefiting the society.

The utility model relates to a down-hole oil pipe rotation preventing type electrical dirty scraping device. A main body is designed into cylindrical-shaped, a fishing head, a centralizer fixed body connected with the fishing head through thread and a rotation preventing arm fixed body connected with the centralizer fixed body through thread are arranged form the upper part to the lower part in sequence, cable holes are arranged at the centers of the fishing head and the centralizer fixed body, a bidirectional cam axle equipped with a cable hole is arranged at the center of the rotation preventing arm fixed body, the upper end of the bidirectional cam axle is connected with the rotation preventing arm fixed body through a screw cap, the lower end is connected with the sheathing thread of a motor through the central hole of the rotation preventing arm fixed body, a cable is connected with the motor through a sealing plug, a sealing sleeve, a pressing screw sleeve, a sliding needle seat and a fixed seat, the pressing screw sleeve is connected with the bidirectional cam shaft through tread, the pressing sealing sleeve and the sliding needle seat are connected with the fixed seat through thread, the fixed seat is connected with the sheathing thread of the motor through thread, the sheathing thread of the motor is connected with a bearing sleeve through thread, the bearing sleeve is connected with a falling prevention screw sleeve through thread, a motor axle is connected with a connecting axle, and the connecting axle is connected with a scraper through thread and a pin. The invention solves the problem that the oil pipe prevents the dirty scraping.

The invention relates to a high-water-content oil reservoir residual oil diving method. The method comprises the steps of determining an oil reservoir flow field quantitative characterization method by analyzing flow field geological main control factors of different oil reservoirs, further determining an initial flow field distribution rule and mode, analyzing a dominant flow field distribution rule and mode by combining development dynamics and other oilfield development later-stage data, and finally utilizing the dominant flow field-mode to analyze the dominant flow field distribution rule and mode; adopting a dominant flow field-initial flow field difference method to find residual oil, and exploiting the residual oil. According to the high-water-content oil reservoir remaining oil diving method provided by the invention, on the basis of oil reservoir classification, the influence of reservoir heterogeneity and structural characteristics on an initial flow field is deeply analyzed, and by re-analyzing the oil reservoir flow field in the later development stage, a dominant flow field is compared with the dominant flow field. The initial flow field forms a knowledge of a region beneficial to the distribution of residual oil in the later period of development, potential residual oil is dug in a targeted manner, the utilization degree and the final recovery ratio of the out-of-control reserves of the oil reservoir are improved, the oil field yield decreasing amplitude is effectively reduced, and the final recovery ratio of the oil reservoir is obviously improved.

The invention discloses an oil-well cement leakage-proof toughener which not only has leakage-proof function and improves the toughness of cement rocks, but also has good multiple-purpose project performance, so as to have double effects and solve the technical problems of slurry loss and the inherent brittleness of the cement rocks in the process of well cementation; the oil-well cement leakage-proof toughener comprises the components based on the weight percentage: 5-30% of organic fiber material, 35-70% of special type inorganic fiber, 1.0-10% of organic polymer material, 5.0-15% of modifying agent and 1.0-10% of auxiliary material.

A modified toe-to-heel waterflooding (TTHW) process is provided for recovering oil from a reservoir in an underground formation. After establishing the conventional TTHW waterflood, the process includes placing a chemical blocking agent at the watered out producing toe portion of the horizontal leg of the production well to create a blockage in the producing toe portion and to create a new producing toe portion in an open portion of the horizontal leg adjacent the blockage through which most of the production takes place. Production is then continued through the new producing toe portion and the open portion of the horizontal leg of the production well. These blocking and producing steps can be continued to progressively block producing toe portions in a direction toward the vertical pilot portion of the production well.

The invention relates to authigenic carbon dioxide oil displacement recovery ratio technology in an oil layer in the technology of performing carbon dioxide composite multi-drive in oil reservoir layer and other ultra-low permeability oil layers and in low permeability oil layers constructed by oil blockage layer cracks and subjected to oil formation improvement technology of oil extraction carbon dioxide composite multi-drive by using the fireflood principle in the oil field extraction work. The technology has two technical schemes that: the first technical scheme is to perform 50 percent of oxygen-enriched injection in segmentation in an air injection well in the oil fields subjected to in-situ combustion to achieve the effect of miscible drive, namely the recovery ratio of the oil layer is improved; and the second technical scheme is that: after an electric heater is arranged under an injection well, air is injected, as the air is continuously heated and injected, the temperature under the well continuously rises, and when strong oxidation is generated under the well, 30 percent of CO2 can be produced, so the final recovery ratio can be improved. The authigenic carbon dioxide oil displacement recovery ratio technology has significant economic benefits.

Disclosed are methods for improving the production of heavy/viscous crude oil from subterranean formations comprising secondary production through use of a displacement fluid (typically a waterflood) wherein the subterranean formation is subjected to cyclic periods of overinjection of the displacement fluid followed by underinjection of the displacement fluid, but keeping the overall cumulative voidage replacement ratio (VRR) within a defined range, typically targeted to be about 1. In some aspects, the initial production of such heavy/viscous crude oil is limited, if possible, followed this cyclic secondary production methodology. By keeping the initial production, VRR, and cumulative VRR in defined ranges, the expected ultimate recovery (EUR) can be optimized, and overall production increased for example by as much as 100% or more relative to conventional production methods.

The invention discloses a cross-well electromagnetic well logging signal emission electronic system and belongs to the technical field of cross-well electromagnetic well logging. A power amplification circuit is adopted to perform power amplification on excitation signals, the power amplification circuit adopts high-pressure power supply, and high-energy low-frequency electromagnetic waves are generated; the emission electronic system is provided with a precise timer module which is used for recording the accurate time of an emission signal and calculating phases of the emission signal and a receiving signal in a receiving well. The emission electronic system is formed by a power module, an underground CPU (Central Processing Unit), a timer module, a DDS (Direct Digital Synthesizer) signal generator, a power amplifier, an impedance matching circuit, an auxiliary parameter measuring module, a main AD (Analog Digital) conversion module and an auxiliary AD conversion module. The cross-well electromagnetic well logging signal emission electronic system can generate high-energy electronic waves, and during electromagnetic well logging, cross-well stratum resistivity is calculated combining the emission data and receiving data and accordingly the cross-well oil and gas distribution is obtained through inversion.

The invention relates to a middle-seepage complex fault block oil reservoir water flooding development effect quantitative evaluation method, which belongs to the oil field development and oil reservoir engineering field. According to the invention, on the foundation of selecting the factors influencing the water flooding development effect for middle-seepage complex fault block oil reservoir and according to the influencing degrees of the various factors on the development effect as well as the logic relationships among the various factors, the evaluation factors with relative independence and operability are determined, superposed in quantification and combined to establish an evaluation grade membership matrix capable of quantitatively evaluating the water flooding development effect of the middle-seepage complex fault block oil reservoir and to accomplish the purpose of quantitatively evaluating the water flooding development effect of the middle-seepage complex fault block oil reservoir. The method fully considers the shared influences of all individual factors on the oil reservoir and the obtained unique quantitative evaluation result for the target oil reservoir can reflect the water flooding development effect for the middle-seepage complex fault block oil reservoir scientifically and accurately so as to provide an objective basis for scientific decisions on oil reservoir development and technical support for the effective adjustment of the oil reservoir development scheme.

The invention discloses an acid fracturing method of multiple acid injecting systems at deep carbonate rock formation. The acid fracturing method comprises the following steps of (1), evaluation of key reservoir parameters, (2) horizontal borehole trajectory determination, (3) determination of well completion mode and pressure separation mode, (4) oil and gas reservoir geological model establishment and production history fitting, (5) optimization of crack parameter systems, (6) optimization of acid pressure construction parameters, (7) different-viscosity acid-liquid independent injecting system design and connection with acid fracturing process, (8) high-viscosity fracturing fluid seam-making construction, (9) simultaneous injecting construction of different-viscosity acid liquid, (10) closed acid variable displacement injecting construction, and (11) replacement operation. By means of the acid fracturing method, the non-uniform etching degree of the inner wall of the crack can be improved, and the acid erosion crack conductivity of the deep carbonate rock formation under the high ground stress condition is improved, so that the effective cycle of the crack of the increase production by acid fracturing is prolonged, and the efficiency of economic development is improved accordingly.

The invention relates to an emulsion self-dispersion relative-permeability regulator. The emulsion self-dispersion relative-permeability regulator comprises an oil-soluble dispersant and a water-soluble dispersant, wherein the volume ratio of the oil-soluble dispersant to the water-soluble dispersant is (1: 9) to (9: 1); based on 100 parts (by weight) of the oil-soluble dispersant, the oil-solubledispersant is prepared from the following ingredients: 20-35 parts of octadecyl acrylate, 1-5 parts of acrylic acid, 10-18 parts of vinyl acetate, 5-12 parts of styrene, 10-20 parts of dibutyl maleicanhydride and the balance of solvent oil; based on 100 parts (by weight) of the water-soluble dispersant, the water-soluble dispersant is prepared from the following ingredients: 15-30 parts of water-soluble anionic surfactant, 10-25 parts of water-soluble nonionic surfactant, 5-12 parts of anhydrous ethanol and the balance of deionized water. The invention further relates to a preparation methodof the emulsion self-dispersion relative-permeability regulator.

The invention discloses a cyclone type inflow control valve comprising a base pipe. A top cover and a sieving pipe sleeve the outside of the base pipe. A plurality of liquid inlets are formed in the middle of the base pipe; flow-limiting valves are installed at the liquid inlets and include upper end covers and bases; swirling chambers and swirling water chambers are arranged at the bases; nozzlescommunicated with the base pipes are arranged at the bottoms of the swirling chambers; guiding diversion grooves communicated with annular flowing channels and the swirling chambers are arranged on the side walls of the swirling chambers; nozzles communicated with the base pipes are arranged at the bottoms of the swirling chambers; and base pipe liquid inlets communicated with the flow-limiting valve are formed in the base pipe. The cyclone type inflow control valve has the following beneficial effects: the pressure drops of fluid flowing into the cyclone type inflow control valve can be adjusted automatically based on the nature of the fluid; and the cyclone type inflow control valve is suitable for the edge/bottom water reservoir and the gas capped reservoir with high anisotropy.

Disclosed are an open hole oil production technology and a separated pipe string. The open hole oil production technology comprises the steps of drilling the reservoir well section; descending the separated pipe string; replacing the well completion fluid; taking the gel breaking or increase production measure; descending a production pipe string; performing well clearing and production. The separated pipe string is connected with the lower end of the production pipe string for open hole oil production and comprises an outer pipe string, an inner pipe string and an external packer; the outer pipe string comprises a screen pipe, a segmented sealing cylinder and a float shoe which are sequentially connected from top to bottom; the upper end of the screen pipe is connected with the lower end of the production pipe string through a top packer; the inner pipe string is arranged in the inner chamber of the outer pipe string; the top of the inner pipe string is connected with the top packer; the bottom of the inner pipe string is provided with a plug; a pipe body of the inner pipe string comprises at least two replaceable center pipes which are connected with each other; the pipe wall of at least one of the two center pipes is provided with a hole; segmented seals are arranged between the pipe walls of the center pipes and the pipe wall of the screen pipe; the external packer sleeves the outer wall of the screen pipe; the outer lateral side of the external packer abuts against the side wall of an open hole.

The invention relates to an underground hydraulic piston pump. The underground hydraulic piston pump comprises a working barrel (30), a fixed valve (43), a transverse partition (45) and a double-piston structure, wherein the fixed valve (43) is arranged on the bottom of the working barrel; the double-piston structure is positioned in inner space of the working barrel (30) and comprises an upper moving valve (33), a lower moving valve (39) and a hollow piston rod (36); and a fluid seal of the hollow piston rod (36) penetrates in the transverse partition (45), so that the upper moving valve (33) is connected with the lower moving valve (39). The underground hydraulic piston pump can descend to the tail end of a high-inclination well or a cluster well, limitation of the high-inclination well or the cluster well on the well descending depth of the underground pump is relieved, the potential productivity of an oil-gas well can be improved to the great extent, the ultimate recovery factor on the development of an oil-gas filed is increased, and the production cost is reduced while the pump efficiency is improved.