31results about How to "Extend the stable production period" patented technology

The invention provides a plunger used for gas well water drainage. The plunger used for the gas well water drainage comprises a center pole, the top end of the center pole is fixedly connected with a throwing and pulling fish head, the periphery of the center pole is sleeved with an outer cylinder capable of sliding up and down along the center pole, the diameter of the bottom end of the center pole is larger than or equal to the inner diameter of the bottom end of the outer cylinder, the bottom end of the center pole makes contact with the bottom end of the outer cylinder in a sealing mode, a cavity is formed by the inner surface of the outer cylinder and the outer surface of the center pole, a plurality of through holes are formed along the axial direction of the outer cylinder, and the through holes are communicated with the cavity. The plunder used for the gas well water drainage is applied to the plunder gas lift water drainage technology, the gas lift water drainage plunger has the functions that an gas flow channel closes in a well bottom or in the process of ascending with liquid, and the gas flow channel opens when reaches the well mouth or in the process of descending. The plunger gas lifting technology under the condition that a gas well is not closed is achieved, the well opening time of the gas well is increased, the stable production period of the gas well is prolonged, frequent well closing is avoided, and the operation cost is reduced.

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 a fracturing method for increasing the full-scale crack supporting volume of deep shale gas. The method comprises the steps of (1) key reservoir parameter evaluation, (2) geological engineering filling point selection, (3) crack parameter and fracturing construction parameter optimization, (4) acid slick water and glue solution formula optimization, (5) perforation operation, (6) acid pretreatment operation, (7) low-viscosity acid slick water injection construction, (8) small-particle-size propping agent injection, (9) variable-viscosity slick water and variable-viscosity ground cross-linked acid injection, and (10) propping agent corresponding injection corresponding to the step (9). The method can be realized in the deep shale gas reservoir fracturing process. Cracks of various scales are opened, communication and full expansion of the cracks of various scales are accelerated, the volumes of the supporting cracks of all levels are increased, the volume decreasing rate of the supporting cracks is reduced, maximization of the multi-scale crack making volume, the supporting efficiency and the supporting volume is achieved, and therefore the drainage area is enlarged, the single well yield is increased, and the stable production period is prolonged.

The invention relates to the technical field of oil and gas reservoir development, in particular to a multi-objective optimization method for reasonable well spacing of an ultra-deep reef flat-phase gas reservoir. The method is used for solving the technical problem that an optimal development well pattern in the prior art does not comprehensively take maximation of economic benefits, maximizationof recovery efficiency and implementation of several targets with certain stable production periods into account. The method comprises the following steps of establishing a multi-objective function of the reasonable well spacing of the reef flat-phase gas reservoir, establishing a constraint condition function and solving the multi-objective function according to the constraint condition function. The multi-objective function is solved by establishing the constraint condition function, and the obtained value of the multi-objective function corresponding to the optimized reasonable well spacing can meet the requirements for the maximum profit, the maximum recovery efficiency and the maximum stable production period. Therefore, the optimized reasonable well spacing can provide a valuable guiding basis for oil field exploration, and correspondingly considerable social benefits and economic benefits are obtained.

The invention provides a super-hydrophobic pre-filled gravel sand control pipe and a preparation method thereof. The super-hydrophobic pre-filled gravel sand control pipe comprises a base pipe, a super-hydrophobic sand control pipe shell and a super-hydrophobic gravel layer; the base pipe is sleeved with the super-hydrophobic sand control pipe shell, and the super-hydrophobic gravel layer is filled between the base pipe and the super-hydrophobic sand control pipe shell; and the surface of the super-hydrophobic sand control pipe shell is provided with a first super-hydrophobic coating, the super-hydrophobic gravel layer is collected by super-hydrophobic gravel, and the surfaces of the super-hydrophobic gravel are provided with second super-hydrophobic coatings. The super-hydrophobic pre-filled gravel sand control pipe can not only realize the self-cleaning function of the sand blocking medium, but also can achieve the purpose of controlling water and increasing oil in high water cut well and prolong the stable production period of oil wells.

The invention discloses a low pressure dense oil reservoir supplementary energy fracturing method. The low pressure dense oil reservoir supplementary energy fracturing method comprises the following steps that a plurality of long horizontal wells are deployed in a low pressure dense oil reservoir, long horizontal well shafts are parallel one another, the long horizontal well shafts are perpendicular to the direction of the maximum principal stress of the formation; each long horizontal well is laid through close cutting precision fracturing; through full three-dimensional fracturing software simulation, the amount of ground-entering fluid required for fracturing fractures to completely cover spaces between all long horizontal wells and spaces between sections of each long horizontal well segment is obtained; supplementary ground-entering fluid required when the formation pressure in the range of long horizontal well reaches a preset multiple of the original formation pressure is calculated; and all the long horizontal wells are fractured according to the amount of ground fluid and the supplementary ground fluid. According to the low pressure dense oil reservoir supplementary energyfracturing method, the production decline of the low-pressure dense oil reservoir can be slowed down, the stable production period is prolonged, the recovery degree is improved, and the cumulative production of a single well in a whole life cycle of a single well is increased.

The invention relates to a water plugging and fracturing method for an old high-water-content well in a low-permeability oil and gas field. The method is characterized in that a cementing truck is utilized for injecting cement paste into the stratum, then a fracturing truck is utilized for injecting high-viscosity suspension sand fluid into the stratum in low discharging capacity, an original propping agent in stratum cracks is suspended, and the cement paste is pushed to the end portions of the cracks, finally, surface active agent fracturing liquid is injected into the stratum in large discharging capacity for fracturing construction, wherein the initial setting time of the cement paste is 6-7 hours. The method can effectively avoid that in the fracturing process, due to the fact that the cracks extend without control, the water channeling and water logging phenomena occur, and achieve turnaround fracturing in the cracks without a turnaround agent, and is beneficial for improving thefracturing construction effect.

The invention comprises the preparation of a self-distribution seepage-regulation polymer and a self-distribution seepage-regulation water-controlling acidifying technology. The preparation of the regulation polymer comprises the steps of: adding 5-15 parts by mass of dimethyl diallyl ammonium chloride monomer, 2-8 parts by mass of acrylate monomer, 1-8 parts by mass of crylamide monomer, and the balance deionized water into a reaction vessel in turn; stirring the mixture; keeping the mixture at a constant temperature; introducing nitrogen to remove oxygen; adding a solid initiator which accounts for 0.2-0.8% by weight of the total mass; and allowing the obtained mixture to react for 7-9 hours under normal pressure. The self-distribution seepage-regulation water-controlling acidifying technology comprises the steps of preparation of a pad fluid, preparation of a cleaning agent, and performance of water-controlling acidifying construction. The preparation of the pad fluid comprises the steps of adding 0.2%-5% by weight of the self-distribution seepage-regulation polymer, 3%-15% by weight of hydrochloric acid or mud acid, and 0.5%-2% by weight of a corrosion inhibitor to clear water; and stirring the mixture uniformly under normal temperature and pressure. The preparation of the cleaning agent comprises the step of adding 2%-3% by weight of KCl brine to 20m3 of 1% by weight of a nonionic surfactant. The performance of water-controlling acidifying construction comprises the steps of washing a well in forward and reverse directions by running a tubing string; washing an oil reservoir wherein the pad fluid is injected under the pressure of less than70% of an oil reservoir fracture pressure; injecting a routine acidifying liquid and closing the well.

The invention discloses a preparation process of loaded water-controlled sand with phase permeability regulating function. The preparation process comprises the following steps of: A) cleaning the surface of quartz sand or ceramsite; B) modifying the surface of the quartz sand or the ceramsite; and C) mixing the surface-modified quartz sand or ceramsite and the mixture of monomer acrylic acid, propylene, sulfonated propylene and deionized water and generating the loaded water-controlled sand with phase permeability regulating function by autopolymerization under the action of an initiator. The process prevents sand; the loaded water-controlled sand with phase permeability regulating function controls water in a limited way, so that the advantages of gravel packing technology are brought into play, the conventional process technology is endowed with unique performance, sand is prevented, the comprehensive water content of an oil well is lowered greatly, the yield of crude oil is increased, the stable production period of the oil well is prolonged, development efficiency or economic benefit is improved, and the like; and the process is widely applied to a sand prevention and water control process used in oil exploitation.

The invention provides a horizontal well pre-fracturing injection fluid development method based on a three-dimensional fracturing well pattern. The method comprises the steps that 1, a target horizontal well is deployed in an oil layer, and the target horizontal well is not fractured, a first horizontal well parallel to the target horizontal well is deployed at the upper part of the horizontal section of the target horizontal well, and fracturing is carried out on the first horizontal well to form a crack perpendicular to the direction of the horizontal section of the target horizontal well,a vertical well is deployed around the target horizontal well, and fracturing is carried out on the vertical well to form another crack of which the trend is parallel to the direction of the horizontal section of the target horizontal well and the position is lower than that of the horizontal section of the target horizontal well; 2, under the condition that the target horizontal well is not fractured and does not produce, the first horizontal well and the vertical well serve as injection wells, and energy supplementing fluid is injected into a stratum; and 3, after stratum energy supplementing fluid injection is completed, fracturing is carried out on the target horizontal well, and well opening production is carried out, and meanwhile, the first horizontal well and the vertical well which sever as the injection wells are converted into oil production well for well opening production.

The invention discloses a development method for realizing advanced water injection and early water injection by utilizing a horizontal well. The development method comprises the following steps: S1,selecting a region; S2, selecting the well; S3, determining an integrated injection-production scheme; S4, determining a staged fracturing scheme; S5, dredging and washing the well; S6, testing oil and seeking production; S7, perforating and fracturing a water injection section; S8, scraping and washing the well; S9, feeding an integrated injection-production tool; S10, checking and sealing the integrated injection-production tool; S11, feeding a well completion tubular column to be butted into the well; and S12, injecting water in an annulus and extracting oil by an oil pipe. The developmentmethod has the advantages that injection-production integration can be realized on one well, the water injection investment is reduced, the problems of difficulty in regional water injection and thelike are solved, the capacity can be supplemented for the stratum, the decline rate of the oil well is delayed, the stable production period of the oil well is prolonged, the oil extraction speed andthe final recovery rate of the oil well are improved, the capital recovery period is shortened, the development benefit is improved, and economic and efficient development is realized.