CN112814616A - Method for adjusting construction reinforced bridge of fracture-cave type oil reservoir flow passage - Google Patents
Method for adjusting construction reinforced bridge of fracture-cave type oil reservoir flow passage Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Abstract
The invention discloses a method for adjusting and constructing a reinforced bridge in a flow passage of a fracture-cave type oil reservoir, which comprises the following steps: dividing the fracture-cave type oil reservoir into a surface weathered crust karst oil reservoir, a weathered crust-underground river composite karst oil reservoir and a dissolved gas reservoir; selecting flow regulating materials for oil reservoir bridging, then carrying out reinforced bridging, specifically, carrying out interference filling on the surface weathering crust karst oil reservoir by using soft elastomers with the size larger than the size of a channel, and then realizing reinforced bridging by using flow regulating particles; the weathered shell-underground river composite karst oil reservoir is preposed by using a plastic elastomer with the size matched with the size of a channel, and then the flow regulating particles are used for realizing reinforced bridging; when the dissolved gas reservoir is bridged near a well, the flow regulating particles are used for realizing reinforced bridging after the gel is pre-arranged; when the broken solution reservoir is bridged in a far well, the flow regulating particles are used for realizing the reinforced bridging after the resin is arranged in front. The invention can effectively reduce the construction cost, shorten the construction time and improve the process efficiency.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method for adjusting and constructing a reinforced bridge in a fracture-cavity type oil reservoir flow passage.
Background
In the oil and gas field development process, the positioning and accurate plugging of flow regulating particles is usually realized through the bridging effect. In the prior art, researches on bridging and high-efficiency plugging are mostly concentrated in the field of various medicaments, and a bridging method is not mentioned.
For example, in the literature (research and application of sun cloud super strong plugging high lubrication drilling fluid system [ J ]. new product of new technology in china 2020,3 (below): 77-78), aiming at the problems of common leakage of target layer of cold oil field, serious well building degree, serious directional pressure supporting and the like, the formula of the drilling fluid is developed: 4 to 6 percent of bentonite, 0.2 to 0.3 percent of soda, 0.1 percent of caustic soda, 2 to 3 percent of sulfonated lignite, 1.5 to 3 percent of phenolic resin, 2 to 4 percent of superfine calcium carbonate, 0.2 to 0.3 percent of macromolecular coating agent, 0.15 to 0.3 percent of xanthan gum, 2 to 4 percent of nano emulsion, 2 to 3 percent of low-permeability treating agent and 2 to 5 percent of high-efficiency lubricant. The system has good plugging performance and lubricating performance.
Also as reported in patent CN109707382A (fracture unilateral plugging method), a fracture unilateral plugging method is provided, which comprises the following steps: s1, putting expansion pipes with corresponding sizes into the cracks, and enabling the expansion pipes to be opened after the expansion pipes reach the preset depth of the cracks; s2, throwing screen cloth and/or fiber clusters into the cracks; s3, pouring expanded mortar in the cracks; s4, pouring quick-drying mortar into the cracks; through the steps, the fracture is blocked from one side. By adopting the scheme, the reliable plugging of cracks which are deeply developed, have larger coverage and are communicated with each other from a single side can be realized. The screen cloth and the fiber clusters can further block smaller gaps, and the slurry waste is further reduced. The adopted expanded mortar can rapidly expand 10-200 times within 3-6 hours after reaching the plugging position, the expansion multiple of the expanded mortar is controlled by adjusting the pH value of the mixing water, and the rest of the mortar is super delayed coagulation mortar, so that the initial setting can be completed after the water absorption gel in the expanded mortar is expanded, thereby forming the preliminary plugging.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a method for adjusting and constructing a reinforced bridge in a flow passage of a fracture-cavity type oil reservoir.
The technical scheme of the invention is as follows:
a method for adjusting and constructing a reinforced bridge in a flow passage of a fracture-cave oil reservoir comprises the following steps:
dividing the fracture-cavity type oil reservoir into a surface layer weathered crust karst oil reservoir, a weathered crust-dark river composite karst oil reservoir and an interrupted solution oil reservoir according to the characteristics and the exploitation characteristics of the carbonate rock oil reservoir;
selecting flow regulating materials for bridging various oil reservoirs, and then carrying out reinforced bridging, specifically:
the surface weathering crust karst reservoir is subjected to interference filling by using a soft elastomer with the size larger than that of the channel, and then the flow regulating particles are used for realizing strengthened bridging;
the weathered shell-underground river composite karst oil reservoir is preposed by using a plastic elastomer with the size matched with the size of a channel, and then the flow regulating particles are used for realizing reinforced bridging;
when the dissolved gas reservoir is bridged near a well, the flow regulating particles are used for realizing reinforced bridging after the gel is pre-arranged;
when the broken solution reservoir is bridged in a far well, the flow regulating particles are used for realizing the reinforced bridging after the resin is arranged in front.
Preferably, when the fracture-cavity type oil reservoir is classified, the surface layer weathered crust karst oil reservoir has the characteristics of strong reservoir heterogeneity, no demixing, no water drive profile and no profile control, and the flow characteristic of the surface layer weathered crust karst oil reservoir is that cavity flow-pipe flow-seepage coupling cannot be performed by reducing the water phase flow rate;
the weathered crust-underground river composite karst is a double-layer structure of a pipeline-shaped underground river superposed below the surface weathered crust karst oil reservoir, an upper weathered crust mainly transversely develops a multi-sleeve fracture-cave system, and a lower part develops a large-scale underground river type karst cave body;
the dissolved-fluid-cutoff oil reservoir has a plurality of vertically-distributed cave-seam systems, the corrosion action from top to bottom is weakened, the upper cave and the lower cave seams are longitudinally developed, and fracture zones are associated with the upper cave and the lower cave seams and communicated with each other through fractures in the transverse direction.
Preferably, the soft elastomer is AM-AMPS-NVP terpolymer, and the soft elastomer is filled with 0-5% of bentonite in a molar ratio.
Preferably, the plastoelastomer is a mixture of polyethylene, asphalt, barium sulfate and white oil.
Preferably, the asphalt is asphalt balls, and the ratio of the polyethylene to the asphalt to the barium sulfate to the white oil is 60-65:25-32:1-5: 2-6.
Preferably, the ratio of the polyethylene to the asphalt to the barium sulfate to the white oil is 63:30:3: 4.
Preferably, the plastoelastomer is prepared by the following method: and mixing the polyethylene, the asphalt, the barium sulfate and the white oil, melting at the temperature of 295-305 ℃, and then selecting a double-screw extruder to carry out underwater granulation to produce the plastic elastomer.
Preferably, the flow regulating particles are rubber particles with the diameter of 0.5-10 mm.
Preferably, the flow regulating particles are processed by waste tires.
Preferably, the construction of the bridge of each type of oil reservoir specifically comprises the following substeps:
the construction procedure of the surface layer weathered crust karst reservoir is as follows: measuring water absorption; testing injection of soft elastic bodies; thirdly, soft bullet with the size larger than the size of the channel is injected formally; formally injecting flow-regulating particles; injecting oil field water with 3 times of the volume of the shaft; closing the well; seventhly, injecting water into the recovery well group;
the construction procedure of the weathered crust-underground river composite karst oil reservoir is as follows: measuring water absorption; injection testing of the plastic elastomer; thirdly, mixing the plastic elastomer and the flow regulating particles and formally injecting; formally injecting flow-regulating particles; injecting oil field water with 3 times of the volume of the shaft; closing the well; seventhly, injecting water into the recovery well group;
the construction procedure of the broken solution reservoir near-well bridge is as follows: measuring water absorption; formally injecting a jelly slug; thirdly, the flow-regulating particles are injected formally; fourthly, injecting oil field water with 1 time of the volume of the shaft; closing the well and waiting for coagulation; sixthly, restoring water injection of the well group;
the construction procedure of the broken solution reservoir far well bridge is as follows: measuring water absorption; formally injecting a resin slug; thirdly, the flow-regulating particles are injected formally; fourthly, injecting oil field water with the volume more than 5 times of that of the shaft; closing the well and waiting for coagulation; sixthly, restoring water injection of the well group.
The invention has the beneficial effects that:
the fracture-cave type oil reservoir is divided into the surface layer weathered crust karst oil reservoir, the weathered crust-underground river composite karst oil reservoir and the fractured-solvent oil reservoir, and then all kinds of oil reservoirs are bridged according to the corresponding oil reservoir characteristics, so that the construction cost can be effectively reduced, the construction time can be shortened, and the process efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of pressure and displacement changes when the weathered crust-underground river composite karst reservoir is subjected to reinforcing bridging in example 1.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, the terms "first", "second", and the like are used for distinguishing similar objects, but not for describing a particular order or sequence order, unless otherwise specified. It is to be understood that the terms so used; the terms "upper", "lower", "left", "right", and the like are used generally with respect to the orientation shown in the drawings, or with respect to the component itself in a vertical, or gravitational orientation; likewise, "inner", "outer", and the like refer to the inner and outer relative to the contours of the components themselves for ease of understanding and description. The above directional terms are not intended to limit the present invention.
Example 1
Taking a certain A well of a weathering crust-underground river karst reservoir of a Tahe oil field as an example, the first round of flow regulation construction is carried out in 5 months in 2020 by adopting the prior art, and the total construction injection liquid amount is 2317m3And the flow regulating agent is 48.2t, no pressure is generated in the whole construction process, but the water content of the other B well of the well group is reduced in the later period, and the oil is effectively increased, but the effective period is short, and the analysis considers that the possible reason is that the flow regulating strength of the first round is not enough, so that the flow regulating material and the method corresponding to the weathering crust-underground river composite karst oil reservoir are determined to be adopted for carrying out the flow regulating construction of the reinforced bridge of the well, and the aim is to utilize the residual oil deeply and improve the recovery ratio of the well group.
The total flow regulation amount of the design is 4850m3Designing the dosage of medium-density flow-regulating particles of 1-2mm to be 61t, designing a plastic elastomer composite flow-regulating agent (polyethylene, asphalt balls, barium sulfate and white oil in a ratio of 63:30:3:4, melting at 300 ℃, and selecting a double-screw extruder to carry out underwater grain-cutting production) to be 10t, designing guanidine gum (serving as an isolation slug) to be 9.2t, and actually injecting the total liquid quantity of a shaft to be 4525m3The medium-density flow-regulating particles 57t, the guanidine gum 8.4t and the plastic-elastomer composite flow regulating agent 9t are used for the construction purpose that weak plugging is established in the existing channel between the well A and the well B, and the casing pressure is increased to 6.8MPa at the later stage of construction, so that the weak plugging pressure condition is achieved.
As shown in figure 1, in the current flow adjusting construction process, the early stage sleeve injection pressure is always 0MPa, and when the accumulated total injection liquid amount reaches 2505m3(flow control agent 1200m3) Then, in order to enhance the continuity of the particles entering the stratum, avoid the particles entering the stratum from being excessively dispersed and arranged and weaken the effect of converging and plugging the flow-regulating particles at the early stage, the injection is carried out in a mode of plastic elastomer slug-plastic elastomer + flow-regulating particle mixed slug-flow-regulating particle slug, and the accumulated total injection liquid amount reaches 3255m3(flow regulator 1800 m)3) Then, the jacket pressure started to rise slowly, and thereafter, the amount of the spacer fluid per stage was increased to 250m3To improve access to existing passages for particles entering the formationEach small gap is dispersedly blocked until the flow regulating agent is replaced by 2100m3And when the sleeve injection pressure reaches an ideal value, finishing the current flow regulation construction. The pressure drop amplitude is small after the pump is stopped, which shows that the flow regulating slug reaches the process purpose of strengthening the bridge.
It should be noted that, in another surface weathered crust karst reservoir well and another dissolved gas reservoir well, the flow regulating material and method corresponding to the surface weathered crust karst reservoir and the dissolved gas reservoir of the invention are respectively adopted to carry out the flow regulating construction of the reinforced bridge of the well, and finally the flow regulating slug also achieves the process purpose of reinforced bridge of each well.
The inventor finds that the phenomena of ' no injection ', blockage in a near well ', rapid zigzag rising of injection pressure and the like can occur when the universal medium-density particles are used in the adjustment construction process of the flow channel of the water injection well group of the surface layer weathered crust karst reservoir. The observation of the surface layer weathered crust karst reservoir rock core and the analysis of the flow regulating construction well case show that the surface layer weathered crust karst reservoir is formed by connecting a small-scale crack with a larger-scale hole and a hole space, the absorption capacity of the reservoir to hard particles is poor, and the phenomena that small-size hard particles can pass through but are not bridged, large-scale hard particles cannot enter and hard particles with proper sizes can generate 'injection pressure roller coasters' are caused. During the experiment, the inventor surprisingly found that the flexible particles (i.e. the soft elastomer of the invention) with the size slightly larger than the channel size and with variable shape can be used to avoid the phenomena and realize the reinforced bridging. The preferred soft elastomer of the invention can be used at 130 ℃ of Tahe and 22.4 multiplied by 104The soft elastomer embodiment has relatively good effect, and is not limited to the soft elastomer of the invention, and other soft elastomers with the size larger than the channel size and still keeping good temperature resistance and salt resistance under the corresponding temperature and mineralization condition of the oil reservoir can also be adopted by the technical personnel in the field to realize the reinforced bridging of the surface layer weathered crust karst oil reservoir.
The inventor finds that the water flow channel of the weathering crust-underground river composite karst reservoir is large in size, a large amount of flow regulating materials are generally required to be accumulated during flow channel adjustment construction, construction cost is high, and construction time is long in the research process. A few cases also produce flow regulating material from the affected well. In the experimental process, the inventor surprisingly discovers that the temperature control material (namely the plastic elastomer) is used for strengthening the bridge, and the temperature control material can be softened and adhered or adhered to the surface of rock under the high-temperature environment of the stratum to form huge resistance and reduce the size of a channel, so that the subsequent injected particles can be rapidly stacked and bridged to realize plugging. The plastic elastomer in the above embodiment of the invention is only a plastic elastomer embodiment with relatively good effect, and is not limited to the plastic elastomer of the invention, and those skilled in the art can also adopt other plastic elastomers with the size matched with the size of the channel to realize the reinforced bridging of the weathering crust-dark river composite karst reservoir.
It should be noted that, in the research process, the inventor finds that the solution reservoir is a system with a plurality of longitudinally-distributed holes, and the flow regulating material needs to be longitudinally blocked in the well group flow passage regulation construction process. During construction, blocking is carried out according to the actual position of a water outlet point or water channeling purposefully. If the water outlet point is near the well or water invades along a high-angle crack near the shaft, jelly is selected as a front-mounted slug so as to finally obtain a better bridging effect; if the water outlet point is in the far well or water invades along the far well fracture by detour, resin is selected as the front-mounted slug, and a better bridging effect can be finally obtained. The jelly and the resin in the prior art are selected, the jelly and the resin in the embodiment of the invention are only jelly and resin embodiments with relatively good effects, the jelly and the resin are not limited by the jelly and the resin in the invention, and a person skilled in the art can also adopt other jellies and resins in the prior art to realize the strengthening bridge of the fractured-solution oil reservoir.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for adjusting and constructing a reinforced bridge in a flow passage of a fracture-cave oil reservoir is characterized by comprising the following steps:
dividing the fracture-cavity type oil reservoir into a surface layer weathered crust karst oil reservoir, a weathered crust-dark river composite karst oil reservoir and an interrupted solution oil reservoir according to the characteristics and the exploitation characteristics of the carbonate rock oil reservoir;
selecting flow regulating materials for bridging various oil reservoirs, and then carrying out reinforced bridging, specifically:
the surface weathering crust karst reservoir is subjected to interference filling by using a soft elastomer with the size larger than that of the channel, and then the flow regulating particles are used for realizing strengthened bridging;
the weathered shell-underground river composite karst oil reservoir is preposed by using a plastic elastomer with the size matched with the size of a channel, and then the flow regulating particles are used for realizing reinforced bridging;
when the dissolved gas reservoir is bridged near a well, the flow regulating particles are used for realizing reinforced bridging after the gel is pre-arranged;
when the broken solution reservoir is bridged in a far well, the flow regulating particles are used for realizing the reinforced bridging after the resin is arranged in front.
2. The method for adjusting and constructing the reinforced bridge according to the flow channel of the fractured-vuggy reservoir of claim 1, wherein when the fractured-vuggy reservoir is classified, the superficial weathered crust karst reservoir has the characteristics of strong reservoir heterogeneity, no delamination, no water drive profile and no profile control, and the flow characteristic of the superficial weathered crust karst reservoir is cavity flow-pipe flow-seepage coupling and cannot be profile controlled by reducing the water phase flow rate;
the weathered crust-underground river composite karst is a double-layer structure of a pipeline-shaped underground river superposed below the surface weathered crust karst oil reservoir, an upper weathered crust mainly transversely develops a multi-sleeve fracture-cave system, and a lower part develops a large-scale underground river type karst cave body;
the dissolved-fluid-cutoff oil reservoir has a plurality of vertically-distributed cave-seam systems, the corrosion action from top to bottom is weakened, the upper cave and the lower cave seams are longitudinally developed, and fracture zones are associated with the upper cave and the lower cave seams and communicated with each other through fractures in the transverse direction.
3. The method for constructing a reinforcement bridge through flow path adjustment of a fractured-vuggy reservoir according to claim 1, wherein the soft elastomer is AM-AMPS-NVP terpolymer, and the soft elastomer is filled with 0-5% of bentonite in a molar ratio.
4. The method for constructing the reinforcement bridge in the flow channel adjustment of the fractured-vuggy reservoir of claim 1, wherein the plastic elastomer is a mixture of polyethylene, asphalt, barium sulfate and white oil.
5. The method for adjusting and constructing the reinforcement bridge in the flow channel of the fractured-vuggy reservoir according to claim 4, wherein the asphalt is asphalt balls, and the ratio of the polyethylene to the asphalt to the barium sulfate to the white oil is 60-65:25-32:1-5: 2-6.
6. The method for adjusting and constructing the reinforcement bridge in the flow channel of the fractured-vuggy reservoir according to claim 5, wherein the ratio of the polyethylene to the asphalt to the barium sulfate to the white oil is 63:30:3: 4.
7. The method for adjusting and constructing the reinforcement bridge in the flow channel of the fractured-vuggy reservoir according to claim 4, wherein the plastic elastomer is prepared by the following method: and mixing the polyethylene, the asphalt, the barium sulfate and the white oil, melting at the temperature of 295-305 ℃, and then selecting a double-screw extruder to carry out underwater granulation to produce the plastic elastomer.
8. The method for constructing the reinforcement bridge through the flow channel adjustment of the fracture-cave oil reservoir according to claim 1, wherein the flow adjusting particles are rubber particles with the diameter of 0.5-10 mm.
9. The method for adjusting and constructing the reinforcement bridge in the flow channel of the fractured-vuggy reservoir according to claim 8, wherein the flow adjusting particles are processed by waste tires.
10. The method for adjusting construction reinforced bridging of the fracture-cave oil reservoir flow passage according to any one of claims 1 to 9, wherein the construction of the bridge of each type of oil reservoir comprises the following substeps:
the construction procedure of the surface layer weathered crust karst reservoir is as follows: measuring water absorption; testing injection of soft elastic bodies; thirdly, soft bullet with the size larger than the size of the channel is injected formally; formally injecting flow-regulating particles; injecting oil field water with 3 times of the volume of the shaft; closing the well; seventhly, injecting water into the recovery well group;
the construction procedure of the weathered crust-underground river composite karst oil reservoir is as follows: measuring water absorption; injection testing of the plastic elastomer; thirdly, mixing the plastic elastomer and the flow regulating particles and formally injecting; formally injecting flow-regulating particles; injecting oil field water with 3 times of the volume of the shaft; closing the well; seventhly, injecting water into the recovery well group;
the construction procedure of the broken solution reservoir near-well bridge is as follows: measuring water absorption; formally injecting a jelly slug; thirdly, the flow-regulating particles are injected formally; fourthly, injecting oil field water with 1 time of the volume of the shaft; closing the well and waiting for coagulation; sixthly, restoring water injection of the well group;
the construction procedure of the broken solution reservoir far well bridge is as follows: measuring water absorption; formally injecting a resin slug; thirdly, the flow-regulating particles are injected formally; fourthly, injecting oil field water with the volume more than 5 times of that of the shaft; closing the well and waiting for coagulation; sixthly, restoring water injection of the well group.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437700A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Temperature-resistant and salt-resistant flow regulating agent suitable for fracture-cavity oil reservoir and preparation method and application thereof |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437700A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Temperature-resistant and salt-resistant flow regulating agent suitable for fracture-cavity oil reservoir and preparation method and application thereof |
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Application publication date: 20210518 |