43results about How to "Reduce seepage resistance" patented technology

The invention discloses a multi-stage temporary plugging depth network acid fracturing method, and belongs to the technical field of oil and gas well production increment and improvement. The method comprises the steps that bridge plugging is formed in an artificial fracture through fracture interior temporary plugging material liquid, the artificial fracture is forced to form multiple branch fractures, and main acid is used for etching the fracture; bridge plugging is formed in an artificial fracture opening through fracture opening temporary plugging material liquid, the fracture is forced to be cracked at the new position of a well wall, and interlayer steering is achieved. The multi-stage temporary plugging depth network acid fracturing method has the advantages of being simple in technology, convenient to operate and the like, a complex fracture network is formed in different permeability zones in carbonatite multi-layer, thick-layer or horizontal well long well sections through the principle of combining fluid power self serching and manual control, the oil and gas region communication probability is increased, the oil and gas percolating resistance is reduced, the single-well yield is improved, and a carbonate reservoir is efficiently and economically developed.

The invention relates to active mixed acid plugging removal solution applicable to a low permeability reservoir and mainly solves the problems of short period of validity and poor plugging removal and augmented injection effects when conventional mud acid and composite acid methods are adopted for plugging removal treatment on low permeability formation. The active mixed acid plugging removal solution consists of the following components in proportions according to weight percent: 9-10% of acetic acid, 5-7% of formic acid, 2%-3% of bifluorid acid ammonium, 2%-4% of boric acid, 1.0-2.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 2.0% of clay stabilizer, 0.5-1.0% of dewetting active agent and 67.0-76.5% of water. The active mixed acid plugging removal solution applicable to the low permeability reservoir can delay the reaction rate of acid rock, increase the effective operating distance of acid solution, and realize the acidification of deep formation, and simultaneously can improve the oil and water seepage characteristics and increase the water phase permeability.

The invention discloses a compound acid blockage removing fluid. The blockage removing fluid is prepared from raw materials in parts by weight as follows: 4-6 parts of a foam flushing fluid, 20-30 parts of a prepad fluid, 70-100 parts of main acid and 10-20 parts of postpad fluid. The acid fluid has higher capacity of removing organic sediment pollution and high acid residue and emulsifying resistance. The acid fluid has low corrosion speed and good swelling inhibition and does not change the original water wetting characteristic of the stratum.

The invention discloses low-filtration-loss blockage relieving fluid for acidification oilfield well. The blockage relieving fluid is prepared from the following raw materials in parts by weight: 20-40 parts of organic acid, 110-130 parts of composite acid body, 2-4 parts of corrosion inhibitor, 30-40 parts of micellar acid stabilizer solution, 1-2 parts of surfactant and 1-3 parts of sodium tripolyphosphate. The reaction speed of the blockage relieving fluid with quartz and feldspar minerals is higher than that of the blockage relieving fluid with clay minerals, so that acid liquid not only can eliminate the formation pollution, but also can well improve the original permeability of the formation; the acid liquor system has good adaptability with the formation, and secondary precipitatedacid slag is not produced in a formation treatment process, so that new pollution is not caused.

The invention relates to a fracturing method of a cluster-type horizontal wall. The cluster-type horizontal wall comprises multiple horizontal sections located in the same storage layer and parallel mutually. The fracturing method includes the steps: selecting two lines of opposite fracturing point groups on the horizontal sections, wherein the fracturing point groups are formed by multiple fracturing points partitioned along the horizontal and the fracturing points of the neighboring horizontal sections are staggered mutually; implementing fracture on the storage layers on the fracturing points to form multiple cracks. With the method, recovery efficiency of the cluster-type horizontal wall can be increased.

The invention provides a chelating augmented injection agent for a water injection well and a preparation method of the chelating augmented injection agent. The chelating augmented injection agent isprepared from the following raw materials in percentage by mass: 26%-35% of an amino cartankylic acid chelating agent, 10%-14% of a penetrating agent, 12%-16% of an ampholytic surfactant, 14%-18% of anonionic surfactant, 18%-22% of a mutual solvent and the balance of water. The chelating augmented injection agent for the water injection well can be used for treating water injection wells with poor injection water quality, stratum scaling and high residual oil saturation and water injection wells with long-term produced water reinjection, resulting in high water injection pressure and seriousunder-injection of the water injection wells or long-term water injection under-injection wells. The crude oil stripped from the rock surface is dispersed into small oil drops under the action of thesurfactant, and the flowing capacity of the crude oil passing through the throat is improved, so that the reservoir permeability is improved, the stratum is dredged, the oil well liquid supply capacity is recovered, and normal water injection of a water well is realized.

The invention provides a method for determining lowering of fluid seepage resistance based on a nanotechnology. The method comprises the steps that first, according to different injection fluids and injection times of an actual working area, the injection process is divided into three stages, namely, the initial injection stage, the nano-solution injection stage and the replacement liquid injection stage; second, according to the seepage Darcy law and the injection times, the total cumulative injection amount of the fluids in a reservoir under the condition of the different injection times ineach of the three phases is determined; third, according to the linear relation between the total cumulative injection amount of the fluids and the injection pressure time integral, the slope of injection resistance curves of the three stages is determined; fourth, the resistance coefficient of the fluid in the reservoir in the nano-solution injection stage and the residual resistance coefficientof the fluid in the reservoir in the replacement liquid injection stage are determined correspondingly; and fifth, according to the relative magnitude relation of the two resistance coefficients in the fourth step, the effects of resistance lowering and injection increasing of the nanotechnology are evaluated. The determining method is accurate, reliable and high in practicability.

The invention discloses a micro packed bed bionic reactor.The micro packed bed bionic reactor comprises a reactor body.Artery channels for air inflow, vein channels for air outflow and catalyst packed bed layers between the artery channels and the vein channels are formed in the reactor body.The reactor body is of a porous structure with a permeable wall.The artery channels and the vein channels are spaced and staggered and each occupy at least one single-end-closed pore channel.The two ends of pore channels in the catalyst packed bed layers are closed, and the closed pores are packed with catalyst granules.The micro packed bed bionic reactor has the advantages of being small in pressure drop, good in heat transfer property, high in catalyst effectiveness coefficient and the like and is very suitable for being applied to a rapid gas-solid catalytic reaction.

The invention provides a hydraulic plug removal acidizing technology. The technology includes the following steps that firstly, a wellhead is detached; secondly, an original well pipe column is lifted out; thirdly, a hydraulic plug removal acidizing pipe column is put down; fourthly, magnetic positioning is conducted; fifthly, high-pressure hydraulic plug removal acidification is conducted; sixthly, a ground pressure test is conducted, wherein the ground pressure test is exerted at 55 Mpa for 10 min, and the test is passed if no puncture or leakage exists; seventhly, a first layer is subjected to hydraulic plug removal acidification; eighthly, steel balls are thrown to hit a sliding sleeve; ninthly, a second layer is subjected to hydraulic plug removal acidification; tenthly, the steel balls are thrown to hit the sliding sleeve; eleventhly, a third layer is subjected to hydraulic plug removal acidification; twelfthly, a well is closed, a reaction is conducted for 12 hours, and then liquid is reversely drained; thirteenthly, the plug removal acidizing pipe column is lifted up; fourteenthly, puncturing washing and measuring are conducted; and fifteenthly, a completion pipe string is put down, wherein a layered water distribution tool and an anti-corrosion oil pipe are put down, and sealing grease is painted; and the wellhead is mounted, and the technology is ended. By the adoption of the technology, a physical method is fully used for increasing the effective penetrating distance of acid liquid in a stratum, the stratum seeping performance is improved within a relatively large range, and therefore the purposes of yield increase and injection increase are achieved.

The invention provides a pulse type fracturing construction process for a liquid self-supporting highway. The process includes the following steps of preparing curable liquid A, low-density carrying liquid B and high-density middle-roof liquid B' on site when fractures are made, mixing the liquid A with the liquid B immediately after the fractures are made, injecting the A/B mixed liquid and the liquid B' into a stratum in a pulse mode until fracturing ends, injecting displacing liquid into a shaft to replace the A/B mixed liquid and the liquid B' in the stratum, and then stopping a pump, closing a well and holding the pressure for 40-180 min. A mixing method of the liquid A and the liquid B includes the step of jetting the liquid A into the liquid B, wherein a jet port is located below the liquid surface of the liquid B, and the liquid A forms evenly-distributed centimeter-level liquid particles in the liquid B. The process can reduce the consumption of the liquid A, further improvesthe suspension property and carrying property of the liquid B, further enhances the flow guide capacity, is beneficial for cleaning a well wall or an oil tube, omits the wall hanging property, and reduces the construction risk.

The invention relates to the technical field of oil and gas field development, and discloses a hole positioning and cleaning assembly and an unconventional reservoir hole positioning and spraying tooland method. The hole positioning and cleaning assembly comprises a rack and a positioning piece, wherein the rack is used for being arranged in an axial groove in the outer surface of a tubular column in an axial moving mode, a first jet hole and a second jet hole are formed in the length direction of the rack at an interval, the positioning piece is used for being rotationally arranged on the outer surface of the tubular column and comprises a tooth part meshed with the rack and an extension arm rotating along with the tooth part, and when the positioning piece rotates, the rack can be driven to move, so that the first jet hole or the second jet hole communicates with a through hole in the bottom wall of the axial groove. The unconventional reservoir hole positioning and jetting tool using the hole positioning and cleaning assembly is accurate in perforation positioning and capable of thoroughly removing blockages in perforations, secondary transformation of the perforations can be achieved, the near-wellbore-zone seepage resistance of wellbores is effectively reduced, and therefore the productivity of the wellbores is recovered, the structure is simple, and the working efficiency is high.

The invention provides a graded displacement oil extraction method for a conglomerate oil reservoir chemical flooding reservoir. The graded displacement oil extraction method comprises the following steps that the pore throat radius of each pervious bed is obtained to obtain a plurality of pore throat radiuses; residual resistance coefficients, corresponding to the multiple pore throat radiuses, of a displacement medium are obtained, and seepage resistance corresponding to each pore throat radius is determined according to capillary pressure of the pore throat radiuses; a displacement pressure gradient is determined according to the parameters of an oil reservoir injection-production system; injection parameters of the displacement medium are determined according to the displacement pressure gradient and the seepage resistances of a plurality of permeable layers; and according to the injection parameters of the displacement medium, the displacement medium is injected into the multiple permeable layers through an injection well, and crude oil in the multiple permeable layers is displaced into an oil producing well to be produced. According to the technical scheme, the problems that in the related technology, chemical agents in the conglomerate oil reservoir easily enter the large pore throats to form high-permeability layer agent channeling and difficultly enter the medium and small pore throats to displace crude oil in medium and low permeability layers are effectively solved.

The invention provides a liquid self-supporting highway fracturing construction process, comprising the following steps: (1) preparing liquid B1 from conventional fracturing liquid and a density adjusting agent according to a certain weight ratio; (2) manufacturing cracks by using the liquid B1; (3) preparing liquid A and liquid B during the manufacturing of the cracks: mixing resin or a resin diluent with a suspension dispersant, adding a curing agent, and performing uniform mixing to obtain the liquid A; uniformly mixing the liquid B1 with the suspension dispersant or uniformly mixing the liquid B1 with the suspension dispersant and a crosslinking agent to obtain the liquid B; (4) after crack manufacturing is completed, jetting the liquid A immediately into the liquid B through a plurality of jet orifices, the jet orifices being located below the liquid surface of the liquid B, and injecting the A and B mixed liquid into a stratum; and (5) displacing all the A and B mixed liquid intothe stratum by using displacement liquid, and building the pressure for 40 to 180 min. The process solves the problem, in the prior art, that the stratum is easily damaged because the liquid A is distributed in blocks and pieces, and can achieve comprehensive crack self-supporting and highway fracturing effects.

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.