CN114961630B - Sand prevention method for oil well filled with foaming material - Google Patents
Sand prevention method for oil well filled with foaming material Download PDFInfo
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- CN114961630B CN114961630B CN202110195235.0A CN202110195235A CN114961630B CN 114961630 B CN114961630 B CN 114961630B CN 202110195235 A CN202110195235 A CN 202110195235A CN 114961630 B CN114961630 B CN 114961630B
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- sand control
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- 239000004576 sand Substances 0.000 title claims abstract description 215
- 238000005187 foaming Methods 0.000 title claims abstract description 89
- 239000000463 material Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000002265 prevention Effects 0.000 title claims abstract description 43
- 239000003129 oil well Substances 0.000 title claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 88
- 239000011347 resin Substances 0.000 claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 19
- 239000006261 foam material Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 9
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- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 claims abstract description 4
- 239000006260 foam Substances 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 239000004088 foaming agent Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 239000004094 surface-active agent Substances 0.000 claims description 18
- 239000012745 toughening agent Substances 0.000 claims description 18
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229920001568 phenolic resin Polymers 0.000 claims description 12
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- 239000007924 injection Substances 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- -1 sodium fatty alcohol Chemical class 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 6
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 5
- 239000007849 furan resin Substances 0.000 claims description 5
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 claims description 4
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- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 3
- 229960004011 methenamine Drugs 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 229920001289 polyvinyl ether Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 229920000877 Melamine resin Polymers 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 235000011054 acetic acid Nutrition 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
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- 230000000903 blocking effect Effects 0.000 abstract description 11
- 238000011161 development Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 184
- 238000010276 construction Methods 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 239000002253 acid Substances 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
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- 239000002245 particle Substances 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
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- 239000004215 Carbon black (E152) Substances 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000018109 developmental process Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000004620 low density foam Substances 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an oil well sand prevention method filled with foaming materials. The sand control method for the oil well comprises the following steps: filling sand-preventing bodies into perforation tunnels by using sand-carrying fluid, foaming and expanding the sand-preventing bodies under the excitation of external conditions, and solidifying and filling the perforation tunnels so as to play a role in sand prevention; the sand control body is processed by solid foaming resin materials, and is foamed and expanded under the action of formation temperature; or the sand control body is formed by encapsulating a liquid foaming resin material in a hollow soluble shell and processing, at the moment, under the action of formation temperature or injected chemical reagent, the soluble shell is dissolved, and the foaming resin material is foamed and expanded. The invention not only maintains the sand blocking performance of the foam material, but also can reduce the consumption of the foam material entering into stratum, thereby reducing the cost and the damage of the reservoir and meeting the requirements of oil field development and production.
Description
Technical Field
The invention relates to the technical field of oil well sand prevention, in particular to an oil well sand prevention method filled with foaming materials.
Background
The sand production of an oil-gas well refers to a process or a phenomenon that rock structure of a stratum nearby a well bottom is changed due to various comprehensive factors such as geological conditions, exploitation modes, measure operation and the like in the production process of the oil-gas well, so that scattered sand or shed sand of the stratum is carried into a shaft or the ground by produced fluid of the stratum, and a series of adverse effects are caused on normal production of the oil-gas well.
The main way to solve the sand production problem of oil and gas well is to adopt sand control technology to prevent the sand produced by stratum from entering the well bore or to artificially strengthen the consolidation degree of nearby stratum rock so as to control the sand production of stratum. The existing sand control technology is mainly divided into two major categories of mechanical sand control and chemical sand control, and concretely can be divided into screen pipe sand control technology, gravel packing sand control technology, fracturing sand control technology, artificial well wall sand control technology, chemical sand fixation technology and the like.
The chemical sand fixing technology is to squeeze chemical sand fixing agent into oil layer to glue loose sand grains together to prevent sand from being produced in the layer. The sand control technology has the advantages of simple construction process, no pipe column left in the shaft, and the like, and is widely applied. However, the chemical sand fixation technology has the problems of short sand prevention effective period, high operation cost, large reservoir damage and the like in the practical application process. In order to improve the application effect of the chemical sand fixation technology, scientific researchers sequentially research and improve the chemical sand prevention technology, wherein the filling of the foaming material for sand prevention is an important research direction.
Chinese patent (CN 1168407A) discloses a formula process of a high-temperature foam resin sand prevention and fixation agent, which comprises modified phenolic resin, heat-resistant auxiliary agent, mutual-dissolving diluent, coupling agent and foaming agent, wherein the foaming agent is aluminum powder. After sand prevention and fixation agent is injected into stratum, the curing agent (acid liquor) is injected to react with foaming agent to generate bubbles, foam is generated, and the foaming agent reacts with modified phenolic resin to cure the phenolic resin. On one hand, loose sand grains can be cemented and solidified, and on the other hand, a solid foam sand blocking layer can be formed on the well wall. However, this process is not ideal in field effect, and mainly has the following problems: (1) The injected sand fixing agent is still a solution system, foam can be generated only by injecting the initiating curing agent after injection, the consumption of resin is not reduced, and the operation cost is high; (2) As with conventional chemical sand consolidation, the sand consolidation agent can enter stratum rock pores, causing reservoir damage; (3) Because the aluminum powder is dispersed and wrapped in the phenolic resin, the initiating curing agent (acid liquor) injected in the later stage is difficult to contact with the aluminum powder, the reaction is insufficient, and the foaming effect is poor.
Chinese patent (CN 106634920 a) discloses a low density foam resin sand control agent suitable for sand production horizontal well of loose sandstone reservoir and its preparation method. The foam resin sand control agent consists of cementing agent, foaming agent, foam stabilizer, curing agent and coupling agent. Wherein the cementing agent is an emulsion of a resin and water. The resin sand control agent is prepared into foam on the ground and is directly injected into an oil well, the foam can be uniformly injected into a heterogeneous oil reservoir, and meanwhile, the foaming technology is utilized, so that the volume of the sand control agent is increased, and the resin consumption and cost are reduced. However, this technique has some disadvantages: (1) The sand prevention principle is still the same as that of the conventional chemical sand fixation technology, loose sandstone is cemented and solidified by using a resin material, and due to the underground complex condition, partial sand grains cannot be contacted and adsorbed with resin, so that the cemented and solidified effect is poor, and the sand prevention effective period is influenced; (2) Most of the components of the sand control agent are water, and the resin is dispersed in the water, so that a solidified foam sand control layer cannot be formed at the well wall after solidification.
Chinese patent (CN 111810097 a) discloses a particulate matter filled completion string and a particulate matter filled completion method, in which a dissolvable pipe is used to fill dry particulate matter that swells with water on the outer layer of an outer pipe string, after the well is run in, a dissolving liquid is injected to dissolve out the dissolvable pipe, so that the particulate matter contacts with fluid, swelling occurs, and the space between the outer pipe string and the wall of the well bore of the development well is gradually filled. The dry particles are polyurethane polymer or foamed styrene polymer. The two materials can be expanded through water absorption, have poor hydrolysis resistance, are easy to hydrolyze after being soaked in water for a long time, and have greatly reduced strength; in addition, the two materials have poor temperature resistance and are not suitable for sand prevention of high-temperature oil wells.
Disclosure of Invention
In order to make up for the defects of the existing chemical sand fixation technology, the invention provides the oil well sand prevention method filled with the foaming material, which not only maintains the sand blocking performance of the foaming material, but also can reduce the consumption of the foaming material entering into stratum, thereby reducing the cost and the damage of a reservoir stratum and meeting the requirements of development and production of oil fields.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an oil well sand control method filled with foaming materials comprises the following steps:
Filling sand-preventing bodies into perforation tunnels by using sand-carrying fluid, foaming and expanding the sand-preventing bodies under the excitation of external conditions, and solidifying and filling the perforation tunnels so as to play a role in sand prevention;
The sand control body is processed by solid foaming resin materials, and is foamed and expanded under the action of formation temperature;
Or the sand control body is formed by encapsulating a liquid foaming resin material in a hollow soluble shell and processing, at the moment, under the action of formation temperature or injected chemical reagent, the soluble shell is dissolved, and the foaming resin material is foamed and expanded.
After entering the perforation tunnel along with sand-carrying fluid, the sand-preventing body used in the invention foams and expands under the excitation of external conditions, is solidified and filled in the perforation tunnel, and the expanded sand-preventing body adapts to the perforation tunnel structure, keeps good fit with the tunnel wall, forms a sand-blocking barrier with open holes and permeability, can block the passage of stratum sand and allows the passage of stratum fluid, thereby playing a role in sand prevention.
According to the oil well sand control method filled with the foaming material of the invention, preferably, the sand control body is processed by solid foaming resin material, and comprises the following steps:
Heating the resin to a temperature above the softening point, or adding a solvent to dissolve the resin into liquid, and then adding an additive to mix the liquid to obtain foaming resin liquid; then soaking the open-cell foam material in the water, taking out and cooling or after the solvent volatilizes, and processing the sand control body.
According to the oil well sand control method filled with the foaming material of the present invention, preferably, the open-cell foam material is a foam material having an open-cell structure and a certain strength, and comprises one or a combination of more than two of metal foam, styrene foam, high-density polyethylene foam, polyurethane foam and melamine foam. The material is processed into spheres and the like by turning, milling and grinding.
The sand control body is formed by encapsulating a liquid foaming resin material in a hollow soluble shell, and the process comprises the following steps:
Heating the resin to a temperature above the softening point, or adding a solvent to dissolve the resin into liquid, and then adding an additive to mix the liquid to obtain foaming resin liquid;
And (3) packaging the foaming resin liquid in a hollow soluble shell, and processing the hollow soluble shell into sand prevention balls.
According to the oil well sand control method filled with the foaming material, preferably, the step of packaging the foaming resin liquid in the hollow soluble shell and processing the foaming resin liquid into sand control balls specifically comprises the following steps of:
taking a metal aluminum or magnesium aluminum alloy material, processing the metal aluminum or magnesium aluminum alloy material into semicircle by a stamping mode, and bonding the two semicircle together to obtain a hollow soluble shell;
drilling small holes on the hollow soluble shell, and injecting foaming resin liquid from the small holes; and plugging the small holes by using metal aluminum wires or magnesium aluminum wires after the injection is finished, and reinforcing the small holes by using an adhesive. Preferably, the small holes have a diameter of 1mm to 2mm.
According to the oil well sand control method filled with the foaming material of the present invention, preferably, the chemical agent is one or a combination of two of hydrochloric acid and acetic acid.
According to the oil well sand control method of the present invention filled with a foaming material, preferably, the resin is selected from at least one of phenolic resin, urea resin and furan resin;
When the resin is thermoplastic phenolic resin, the additive comprises a foaming agent, a curing agent, a surfactant and a toughening agent;
When the resin is thermosetting phenolic resin, urea resin or furan resin, the additive comprises a foaming agent, a surfactant and a toughening agent; at this time, curing agent is not added, and the formation temperature is utilized for curing;
the foaming agent is at least one selected from fluorochlorohydrocarbon, n-hexane and cyclopentane;
the curing agent is at least one selected from hexamethylene tetramine, hydrochloric acid, acetic acid, ammonium chloride and epoxy resin curing agent;
the surfactant is at least one selected from sodium dodecyl benzene sulfonate, sodium fatty alcohol polyvinyl ether sulfate and organic silicon polyether;
the toughening agent is at least one selected from polyvinyl alcohol and polyethylene glycol;
the solvent is at least one selected from ethanol and acetone.
According to the oil well sand prevention method filled with the foaming material, preferably, when the resin is heated to above the softening point, the weight ratio of the resin to the foaming agent to the surfactant to the toughening agent is 100:1-5:0.5-1.5:2-10;
When the solvent is used for dissolving the resin, the weight ratio of the resin, the solvent, the foaming agent, the surfactant and the toughening agent is 100:10-30:1-5:0.5-1.5:2-10.
According to the oil well sand control method filled with the foaming material, the sand control body is preferably in the shape of a sphere or a cylinder and the like.
According to the oil well sand control method filled with the foaming material, preferably, the size of the sand control body is smaller than the diameter of the perforation tunnel, and the sand control body can smoothly enter the perforation tunnel under the pushing of sand-carrying fluid.
According to the oil well sand control method filled with the foaming material, the density of the sand control body before expansion is similar to that of the sand-carrying fluid, preferably, the density of the sand control body is 1.0g/cm 3-1.5g/cm3, and the sand control method is beneficial to carrying of the sand-carrying fluid.
According to the oil well sand control method filled with the foaming material, preferably, the sand control body is provided with open pores after foaming and expansion, and the diameter of the pores is 0.05mm-0.30mm.
According to the method for sand control of an oil well filled with a foaming material of the present invention, preferably, the sand control body has permeability after foaming and expansion, and the permeability is preferably more than 5 darcy.
According to the oil well sand control method filled with the foaming material, preferably, the sand control body has certain compressive strength after foaming and expansion, and the compressive strength is required to be larger than production pressure difference, preferably, larger than 2MPa.
According to the oil well sand control method filled with the foaming material, the sand control body has certain temperature resistance after foaming expansion, and the temperature resistance is preferably higher than 60 ℃.
The concrete site construction method of the oil well sand control method filled with the foaming material comprises the following steps:
(1) The construction pipe column is put into an oil well, and the lower end of the pipe column is positioned at the bottom boundary of the perforating section; the construction pipe column is mainly formed by connecting oil pipes;
(2) Injecting well flushing liquid into the oil pipe, circularly flushing for one week, closing a sleeve valve, and extruding the front liquid into the stratum;
(3) A sand control body is thrown into sand-carrying fluid from a wellhead by using a ground ball throwing device;
(4) The sand control body enters the perforation tunnels along with sand carrying fluid and is gradually filled into the perforation tunnels, when the ground construction pressure has obvious increasing trend, the perforation tunnels are completely filled, and the pumping construction is stopped;
(5) If the sand control body is formed by encapsulating liquid foaming resin material in a hollow soluble shell, injecting chemical reagent (acid liquor) into a shaft according to the requirement, and dissolving the hollow soluble shell; in the oil well with high temperature, high water content and high mineralization degree, the soluble shell can be slowly dissolved, and acid liquid can not be injected at the moment;
(6) Closing the well for more than 12 hours, and after the stratum temperature is recovered, foaming, expanding and solidifying the sand prevention body;
(7) And (5) lifting out the construction pipe column, and putting into the production pipe column to put into production.
The beneficial effects of the invention include:
1) The invention is a single well sand control operation construction, only needs to fill the sand control body into the perforation tunnel, compared with the prior sand control technology that a large amount of sand control materials are filled into the stratum and the shaft, the sand control body is greatly reduced, thereby reducing the sand control cost; and the site operation is simple, the operation is easy, special equipment such as a fracturing truck set is not needed, and the site operation cost is greatly reduced. The sand control body used in the invention has the advantages of easy acquisition of material sources, low price, simple processing technology and low overall manufacturing cost. The invention comprehensively reduces the cost of sand prevention measures from the aspects of sand prevention material consumption, material cost and construction operation.
2) After the sand control measures are taken, no tool is left in the shaft, so that other operations in the later period are convenient, and the shaft pipe column is not required to be salvaged in the later period.
3) The sand control material of the invention does not penetrate into the stratum pores, thus not causing reservoir damage.
4) The sand control method for the oil well has wide application range and good sand control effect, and is not influenced by the water content of the stratum and the length of the well section.
5) The sand control body formed after expansion directly plays a supporting role on the rock on the wall surface of the pore canal of the injection hole, and the peeling and the damage of stratum rock are prevented from the source.
Drawings
FIG. 1 is a schematic representation of a sand control body of the present invention prior to expansion into a perforation tunnel.
FIG. 2 is a schematic representation of a sand control body of the present invention after expansion into a perforation tunnel.
FIG. 3 is a schematic view of a sand control body of the present invention formed by encapsulating a liquid foamable resin material in a hollow dissolvable casing.
Fig. 4 is a schematic view of a construction string according to an embodiment of the present invention.
Reference numerals illustrate:
1-sand control body, 2-perforation tunnel, 3-sand blocking barrier, 51-hollow soluble shell, 52-foaming resin liquid, 11-construction pipe column and 12-ball injector.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Example 1
In the embodiment, a solid foaming resin material is adopted to process into a sand prevention body, and the sand prevention body is adopted to perform oil well sand prevention operation; the method comprises the following steps:
100g of solid thermoplastic phenolic resin is put into a container, 10g of ethanol is added for dissolution, then 5g of normal hexane, 1g of fatty alcohol polyvinyl ether sodium sulfate and 10g of polyethylene are added for uniform stirring and mixing, and foaming resin liquid is obtained.
Soaking the open-cell foam material in foaming resin liquid, fishing out, putting into a 40 ℃ oven for drying, and processing the open-cell foam material into the sand prevention body. The open-cell foam material is processed into spheres by adopting foam metal (Changsha Yuan New Material Co., ltd.) through turning, milling and grinding.
The sand control body at this time did not foam and cross-linked to cure. The sand control body prepared by the embodiment is a perforation tunnel with the sphere size of 8mm and is suitable for more than 10mm, and can smoothly enter the perforation tunnel under the pushing of sand-carrying fluid.
The density of the sand prevention body before expansion is similar to that of the sand-carrying fluid and is 1.2g/cm 3, so that the sand-carrying fluid is facilitated to carry.
Sand-carrying fluid is used to fill sand-preventing body into perforation channel, and the sand-carrying fluid can be clear water, saline water and guanidine gum solution. When the formation temperature is above the foaming temperature of the foaming agent, the sand control body foams, the volume expansion becomes large, and the perforation tunnels are filled. The expanded sand control body has open pores and permeability, can block formation sand from passing through, and allows formation fluid to pass through, thereby playing a role in sand control.
The expanded sand control body forms uniform open pores with the diameter of 0.05mm-0.30mm.
Sand control body experimental test: the sand control body is put into a glass tube, put into dilute hydrochloric acid with the concentration of 10 percent, put into water bath with the temperature of 60 ℃ and foamed and solidified for 48 hours. And injecting clear water to test the permeability to reach 5 darcy. 50g of mixed quartz sand with the particle size ranging from 0.05 to 0.30mm is added, then water is introduced to test the sand blocking performance, the sand output is only 0.056g, and the injection pressure difference is more than 2MPa. Experiments show that the sand control body has good sand blocking performance after expansion.
Example 2
In the embodiment, a solid foaming resin material is adopted to process into a sand prevention body, and the sand prevention body is adopted to perform oil well sand prevention operation; the method comprises the following steps:
The thermoplastic phenolic resin is used as a resin matrix, the foaming agent is fluorine-chlorine hydrocarbon, the curing agent is hexamethylene tetramine, the surfactant is sodium dodecyl benzene sulfonate, and the toughening agent is polyvinyl alcohol.
100G of thermoplastic phenolic resin matrix of tree is put into a container, diluted into liquid state by 10g of acetone, and then 10g foaming agent, 2g of curing agent, 1g of surfactant and 15g of toughening agent are added and evenly mixed.
Soaking the open-cell foam material in the mixed foaming resin material, fishing out, putting into a baking oven at 40 ℃ for baking, and processing the open-cell foam material into the sand-preventing body. The open cell foam material is formed into spheres by turning, milling and grinding through an open cell polyethylene foam (Shijia King macronew material products Co., ltd.).
The sand control body at this time did not foam and cross-linked to cure. The sand control body prepared by the embodiment is a perforation tunnel with the sphere size of 10 mm and is suitable for more than 12mm, and can smoothly enter the perforation tunnel under the pushing of sand-carrying fluid.
The density of the sand prevention body before expansion is similar to that of the sand-carrying fluid and is 1.1g/cm 3, so that the sand-carrying fluid is facilitated to carry.
And filling the sand control body into the perforation tunnels by using sand-carrying fluid. The sand-carrying liquid can be clear water, salt water, guanidine gum solution, etc. When the formation temperature is above the foaming temperature of the foaming agent, the sand control body foams, the volume expansion becomes large, and the perforation tunnels are filled. The expanded sand control body has open pores and permeability, can block formation sand from passing through, and allows formation fluid to pass through, thereby playing a role in sand control.
Sand control body experimental test: the sand control body is put into a glass tube, put into dilute hydrochloric acid with the concentration of 10 percent, put into water bath with the temperature of 60 ℃ and foamed and solidified for 48 hours. The permeability is up to 4.5 darcy when the clean water is injected. 50g of mixed quartz sand with the particle size ranging from 0.05 to 0.30mm is added, then water is introduced to test the sand blocking performance, the sand output is only 0.047g, and the injection pressure difference is more than 2.3MPa. Experiments show that the sand control body has good sand blocking performance after expansion.
Example 3
In the embodiment, a solid foaming resin material is adopted to process into a sand prevention body, and the sand prevention body is adopted to perform oil well sand prevention operation; the method comprises the following steps:
the thermosetting phenolic resin is used as a resin matrix, the foaming agent is fluorine-chlorine hydrocarbon, a curing agent is not required to be added, the surfactant is sodium dodecyl benzene sulfonate, and the toughening agent is polyvinyl alcohol.
100G of resin matrix is placed into a container to be heated to a temperature above the softening point, and then 15g of foaming agent, 2g of surfactant and 6g of toughening agent are added to be uniformly mixed.
Soaking the open-cell foam material in the mixed foaming resin material, fishing out, putting into a baking oven at 40 ℃ for baking, and processing the open-cell foam material into the sand-preventing body. The open cell foam material is formed into spheres by turning, milling and grinding through an open cell polyethylene foam (Shijia King macronew material products Co., ltd.).
The sand control body at this time did not foam and cross-linked to cure. The sand control body prepared by the embodiment is a perforation tunnel with the sphere size of 8mm and is suitable for more than 10mm, and can smoothly enter the perforation tunnel under the pushing of sand-carrying fluid.
The density of the sand prevention body before expansion is similar to that of the sand-carrying fluid and is 1.25g/cm 3, so that the sand-carrying fluid is facilitated to carry.
And filling the sand control body into the perforation tunnels by using sand-carrying fluid. The sand-carrying liquid can be clear water, salt water, guanidine gum solution, etc. When the formation temperature is above the foaming temperature of the foaming agent, the sand control body foams, the volume expansion becomes large, and the perforation tunnels are filled. The expanded sand control body has open pores and permeability, can block formation sand from passing through, and allows formation fluid to pass through, thereby playing a role in sand control.
Sand control body experimental test: the sand control body is put into a glass tube, put into dilute hydrochloric acid with the concentration of 10 percent, put into water bath with the temperature of 60 ℃ and foamed and solidified for 48 hours. The permeability is up to 6.5 darcy when the clean water is injected. 50g of mixed quartz sand with the particle size ranging from 0.05 to 0.30mm is added, then water is introduced to test the sand blocking performance, the sand output is only 0.076g, and the injection pressure difference is more than 2.7MPa. Experiments show that the sand control body has good sand blocking performance after expansion.
Example 4
In the embodiment, the liquid foaming resin material is encapsulated in the hollow soluble shell to be processed into a sand prevention body, and the sand prevention body is adopted to perform oil well sand prevention operation; the method comprises the following steps:
the furan resin is used as a resin matrix, the fluorocarbon is used as a foaming agent, the sodium dodecyl benzene sulfonate is used as a surfactant, and the polyvinyl alcohol is used as a toughening agent.
100G of resin matrix is placed into a container (without solvent), 10g of foaming agent, 2g of surfactant and 10g of toughening agent are added and uniformly stirred and mixed, and foaming resin liquid is obtained.
As shown in fig. 3, the mixed foamed resin liquid seal 52 is enclosed in a hollow soluble shell 51, and processed into sand control balls. The hollow soluble shell 51 is a hollow aluminum sphere with a diameter of 8-10mm and a wall thickness of 1-2 mm.
The hollow aluminum spheres are prepared by the following process:
Processing metal aluminum into semicircle by stamping, and bonding the two semicircle together to obtain hollow aluminum ball; drilling a small hole with the diameter of 1mm-2mm on the hollow aluminum ball, and injecting foaming resin liquid from the small hole; after the injection is completed, the small holes are plugged by metal aluminum wires and reinforced by adhesives.
When the sand control body of the embodiment is used according to the method of the embodiment, acid liquid is required to be injected into a shaft, the hollow soluble shell is dissolved, the foaming resin solution is foamed and expanded at the stratum temperature, and the acid liquid contacts and is subjected to a curing reaction, so that the foam sand control layer with an open-cell structure is formed.
Example 5
In the embodiment, the liquid foaming resin material is encapsulated in the hollow soluble shell to be processed into a sand prevention body, and the sand prevention body is adopted to perform oil well sand prevention operation; the method comprises the following steps:
The urea-formaldehyde resin is used as a resin matrix, the foaming agent is fluorine-chlorine hydrocarbon, the surfactant is sodium dodecyl benzene sulfonate, and the toughening agent is polyvinyl alcohol.
100G of resin matrix is placed into a container (without solvent), 10g of foaming agent, 4g of surfactant and 10g of toughening agent are added and uniformly stirred and mixed, and foaming resin liquid is obtained.
As shown in fig. 3, the mixed foamed resin liquid seal 52 is enclosed in a hollow soluble shell 51, and processed into sand control balls. The hollow soluble shell 51 is a hollow aluminum sphere with a diameter of 8-10mm and a wall thickness of 1-2 mm.
The hollow aluminum spheres are prepared by the following process:
Processing metal aluminum into semicircle by stamping, and bonding the two semicircle together to obtain hollow aluminum ball; drilling a small hole with the diameter of 1mm-2mm on the hollow aluminum ball, and injecting foaming resin liquid from the small hole; after the injection is completed, the small holes are plugged by metal aluminum wires and reinforced by adhesives.
When the sand control body of the embodiment is used according to the method of the embodiment, acid liquid is required to be injected into a shaft, the hollow soluble shell is dissolved, the foaming resin solution is foamed and expanded at the stratum temperature, and the acid liquid contacts and is subjected to a curing reaction, so that the foam sand control layer with an open-cell structure is formed.
Example 6
The embodiment adopts the sand control body processed by the solid foaming resin material for site construction, and comprises the following steps:
(1) As shown in fig. 4, the construction string 11 is run into the well, and the lower end of the string is positioned at the bottom boundary of the perforating section; the construction string 11 is mainly formed by connecting oil pipes.
(2) Injecting well flushing liquid into the oil pipe by using the cement truck, circularly flushing the well for a week, closing the sleeve valve, and extruding the front liquid into the stratum.
(3) The sand control body is put into the sand-carrying fluid from the wellhead by using the ground ball injector 12.
(4) As shown in fig. 1, the sand control body 1 enters the perforation tunnels 2 along with sand-carrying fluid and is gradually filled into the perforation tunnels 2, and when the ground construction pressure has a remarkable increasing trend, the perforation tunnels are completely filled, and pumping construction is stopped.
(5) Closing the well for more than 12 hours, recovering the stratum temperature, and foaming, expanding and solidifying the sand control body to form the sand blocking barrier 3 as shown in figure 2.
(6) And (5) lifting out the construction pipe column, and putting into the production pipe column to put into production.
Example 7
The embodiment adopts the sand control body formed by processing the liquid foaming resin material packaged in the hollow soluble shell for site construction, and comprises the following steps:
(1) And (3) placing the construction pipe column into the oil well, wherein the lower end of the pipe column is positioned at the bottom boundary of the perforating section, and the construction pipe column is mainly formed by connecting oil pipes.
(2) Injecting well flushing liquid into the oil pipe by using the cement truck, circularly flushing the well for a week, closing the sleeve valve, and extruding the front liquid into the stratum.
(3) And (3) throwing sand control balls into sand-carrying fluid from a wellhead by using a ground ball throwing device.
(4) The sand control ball enters the perforation tunnels along with sand-carrying fluid and is gradually filled into the perforation tunnels, and when the ground construction pressure has obvious increasing trend, the sand control ball indicates that the perforation tunnels are completely filled, and pumping construction is stopped.
(5) And extruding a certain amount of hydrochloric acid to dissolve the sand prevention ball shell.
(6) Closing the well for more than 12 hours, and after the stratum temperature is recovered, foaming, expanding and solidifying the foaming resin liquid.
(7) And (5) lifting out the construction pipe column, and putting into the production pipe column to put into production.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. An oil well sand control method filled with foaming materials is characterized by comprising the following steps:
filling sand-preventing bodies into perforation tunnels by using sand-carrying fluid, foaming and expanding the sand-preventing bodies under the excitation of external conditions, solidifying and filling the perforation tunnels, and enabling the expanded sand-preventing bodies to adapt to the perforation tunnel structure, keep fit with the tunnel walls to form a sand-blocking barrier with perforated holes and permeability, so that stratum sand can be blocked from passing through, stratum fluid is allowed to pass through, and a sand-preventing effect is achieved;
The sand control body is processed by solid foaming resin materials, and is foamed and expanded under the action of formation temperature;
Or the sand control body is formed by encapsulating a liquid foaming resin material in a hollow soluble shell for processing, at the moment, the soluble shell is dissolved under the action of formation temperature or injected chemical reagent, and the liquid foaming resin material is foamed and expanded;
The process for processing the sand control body by the solid foaming resin material comprises the following steps:
Heating the resin to a temperature above the softening point, or adding a solvent to dissolve the resin into liquid, and then adding an additive to mix the liquid to obtain foaming resin liquid; then soaking the open-cell foam material in the water, and fishing out and cooling or processing the water into a sand control body after the solvent volatilizes;
The open-cell foam material is a foam material with an open-cell structure and a certain strength, and comprises one or more than two of foam metal, styrene foam, high-density polyethylene foam, polyurethane foam and melamine foam;
The sand control body is formed by encapsulating a liquid foaming resin material in a hollow soluble shell, and the process comprises the following steps:
Heating the resin to a temperature above the softening point, or adding a solvent to dissolve the resin into liquid, and then adding an additive to mix the liquid to obtain foaming resin liquid;
Packaging the foaming resin liquid in a hollow soluble shell, and processing the foaming resin liquid into a sand prevention body;
The resin is at least one selected from phenolic resin, urea resin and furan resin;
When the resin is thermoplastic phenolic resin, the additive comprises a foaming agent, a curing agent, a surfactant and a toughening agent;
when the resin is thermosetting phenolic resin, urea resin or furan resin, the additive comprises a foaming agent, a surfactant and a toughening agent;
The sand control body is provided with open pores after foaming and expansion, and the diameter of the pores is 0.05 mm-0.30 mm.
2. The method for sand control of an oil well filled with a foaming material according to claim 1, wherein the step of packing the foaming resin liquid in a hollow soluble casing and processing the foaming resin liquid into a sand control body specifically comprises the following steps:
taking a metal aluminum or magnesium aluminum alloy material, processing the metal aluminum or magnesium aluminum alloy material into semicircle by a stamping mode, and bonding the two semicircle together to obtain a hollow soluble shell;
Drilling small holes on the hollow soluble shell, and injecting foaming resin liquid from the small holes; and plugging the small holes by using metal aluminum wires or magnesium aluminum wires after the injection is finished, and reinforcing the small holes by using an adhesive.
3. The foam-filled oil well sand control method of claim 2 wherein said small bore diameter is 1 mm-2 mm.
4. The foam-filled oil well sand control method of claim 2 wherein the chemical agent is one or a combination of two of hydrochloric acid and acetic acid.
5. The method for sand control in a foamed material filled well of claim 1,
The foaming agent is at least one selected from fluorochlorohydrocarbon, n-hexane and cyclopentane;
the curing agent is at least one selected from hexamethylene tetramine, hydrochloric acid, acetic acid, ammonium chloride and epoxy resin curing agent;
the surfactant is at least one selected from sodium dodecyl benzene sulfonate, sodium fatty alcohol polyvinyl ether sulfate and organic silicon polyether;
the toughening agent is at least one selected from polyvinyl alcohol and polyethylene glycol;
the solvent is at least one selected from ethanol and acetone.
6. The sand control method for oil well filled with foaming material according to claim 1 or 5, wherein when the resin is heated to above the softening point, the weight ratio of the resin, the foaming agent, the surfactant and the toughening agent is 100:1-5:0.5-1.5:2-10;
When the resin is added with the solvent to be dissolved into liquid, the weight ratio of the resin to the solvent to the foaming agent to the surfactant to the toughening agent is 100:10-30:1-5:0.5-1.5:2-10.
7. The foam-filled oil well sand control method of claim 1 wherein the sand control body is a sphere or cylinder.
8. The foam filled oil well sand control method of claim 1 wherein the sand control body has a size less than the perforation tunnel diameter.
9. The foam-filled oil well sand control method of claim 1 wherein the sand control body has a density of 1.0 g/cm 3-1.5g/cm3.
10. The method for sand control in a well filled with a foamed material of claim 1, wherein the sand control body has a permeability after expansion of greater than 5 darcy;
the compressive strength of the sand control body after foaming expansion is larger than the production pressure difference;
the temperature resistance of the sand control body after foaming expansion is more than 60 ℃.
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| CN117551440B (en) * | 2024-01-10 | 2024-03-26 | 东营煜煌能源技术有限公司 | Foamed resin sand-fixing agent and preparation method thereof |
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| CN1403532A (en) * | 2002-10-01 | 2003-03-19 | 胜利油田方圆科工贸有限责任公司化工分公司 | Composite sand-proof material for oil-water well and its preparation |
| CN102558763A (en) * | 2012-01-04 | 2012-07-11 | 山西兆信生物科技有限公司 | Foamable phenolic resin strengthening and filling material for coal mine |
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| US8276664B2 (en) * | 2007-08-13 | 2012-10-02 | Baker Hughes Incorporated | Well treatment operations using spherical cellulosic particulates |
| WO2015126419A1 (en) * | 2014-02-24 | 2015-08-27 | Halliburton Energy Services, Inc. | Propping subterranean formation fractures using memory particulates |
| US11155751B2 (en) * | 2019-01-22 | 2021-10-26 | Baker Hughes Holdings Llc | Method of treating subterranean formations with composites having enhanced strength |
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| CN102558763A (en) * | 2012-01-04 | 2012-07-11 | 山西兆信生物科技有限公司 | Foamable phenolic resin strengthening and filling material for coal mine |
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