CN119531793B - Self-adaptive sand control screen pipe for weakly cemented reservoir oil and gas well and preparation method and application thereof - Google Patents
Self-adaptive sand control screen pipe for weakly cemented reservoir oil and gas well and preparation method and application thereofInfo
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- CN119531793B CN119531793B CN202411641487.1A CN202411641487A CN119531793B CN 119531793 B CN119531793 B CN 119531793B CN 202411641487 A CN202411641487 A CN 202411641487A CN 119531793 B CN119531793 B CN 119531793B
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- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
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- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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Abstract
The invention discloses a self-adaptive sand control screen pipe for an oil and gas well of a weakly cemented reservoir, and a preparation method and application thereof, and belongs to the technical field of oil and gas resource exploitation. The invention also discloses a preparation method of the self-adaptive sand control screen pipe and application of the self-adaptive sand control screen pipe in a weakly cemented reservoir. The invention solves the problems of wellbore blockage, near-well stratum collapse and the like existing in the application of the existing sand control mode to the exploitation well of the weak cementing oil and gas reservoir such as muddy silt and the like, and improves the long-term sand control requirement of the unconventional oil and gas reservoir underground by aiming at the incapability of the existing organic high polymer material.
Description
Technical Field
The invention belongs to the technical field of oil and gas resource exploitation, and particularly relates to a self-adaptive sand control screen pipe for an oil and gas well of a weakly cemented reservoir, and a preparation method and application thereof.
Background
In the development process of oil gas in a weakly cemented reservoir, the mechanical property of the stratum is changed due to great pressure reduction, and other associated geological disasters can be caused while the exploitation efficiency is reduced due to the phenomena of well wall instability and the like. The layer sand production is the phenomenon that soft fine powder sand and muddy powder sand move to a near well along with gas in the oil and gas resource exploitation process to block a gas production pipeline. At present, most of the exploitation methods of oil gas in weakly cemented reservoirs face the problems of sand production and near well blockage, and further, how to realize an effective sand control technology is a key to the exploitation of the oil gas.
In terms of sand production prevention and control, the conventional sand control method for oil and gas resource exploitation at present comprises wire-wrapped screen sand control, gravel packing sand control, chemical sand control and the like. However, in practice, the gravel packing sand control method has proved to be not suitable for the oil and gas reservoirs of weakly cemented reservoirs, and has the problems of serious sand collapse, near well collapse and the like, so that seepage channels are blocked, gas and water production is affected, and the productivity is reduced. In addition, the chemical sand fixation is applied to a reservoir stratum of a high clay content, so that the problems of low solidification strength and the like exist, and the sand prevention effect is affected. Therefore, the conventional sand prevention mode cannot meet the sand prevention and well cementation requirements in the long-term exploitation process of other unconventional energy sources such as a weakly cemented reservoir oil and gas reservoir.
Therefore, how to provide a well cementation sand control well completion mode based on a weakly cemented hydrocarbon reservoir and provide an adaptive sand control screen suitable for a weakly cemented hydrocarbon reservoir oil and gas well is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-adaptive sand control screen pipe for a weakly cemented reservoir oil and gas well, and a preparation method and application thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an adaptive sand-preventing screen pipe for the oil-gas well of weakly cemented reservoir is composed of electrically heated base pipe, adaptive high-molecular polymer layer and protecting paint layer.
Preferably, the electric heating base pipe comprises a main pipe and connectors, wherein the connectors are arranged at two ends of the main pipe, the electric heating base pipe is connected with a drill rod, a drill collar, a reamer and the like through the connectors, and the connection mode of the connection comprises but is not limited to plug-in type or screw thread type.
The main body pipe comprises a high-strength inner layer, a high-electric-conductivity heat-conductivity middle interlayer and a high-heat-conductivity coefficient material outer layer from inside to outside, wherein the high-heat-conductivity coefficient material outer layer is made of a metal composite material, is a good conductor of heat, has high temperature resistance and high corrosion resistance, has an inert surface and does not react with the self-adaptive high-molecular polymer.
The middle interlayer inner wall comprises an electric heating wire, and the electric heating wire can receive electric signals and convert the electric signals into thermal signals so as to play a role in heating.
More preferably, the high thermal conductivity material includes but is not limited to low carbon steel, copper alloy, aluminum alloy and metal composite conductive material made of low carbon steel and other high conductive materials, has good electric conductivity and thermal conductivity, and has compressive strength of more than 10 MPa.
The electric heating base pipe can be a closed pipe body, can also be used as a slotted screen pipe, comprises one or a combination of a plurality of circular holes, axial slots and circumferential slots, and is combined with a self-adaptive high polymer layer to form a double sand blocking barrier.
Preferably, the self-adaptive high molecular polymer is formed by curing self-adaptive high molecular polymer slurry at a high temperature of more than 80 ℃;
The self-adaptive high polymer slurry comprises, by weight, 17.6-37.8 parts of polyisocyanate, 20.0-30.0 parts of polyester polyol, 2.9-9.5 parts of cross-linking chain extender, 103.5-198.6 parts of pore-forming agent, 0-2.8 parts of surfactant and 30-60 parts of slurry solvent.
The self-adaptive high molecular polymer has the beneficial effects that the self-adaptive high molecular polymer has better thermodynamic property and porous structure. Can be obviously compressed and fixed at high temperature, can sense thermal stimulus at a certain temperature and make expansion response under the well, and can adapt to the diameter of the well bore. And the aperture can meet the control requirement of the well completion sand prevention on the particle size of stratum sand.
Preferably, the polyisocyanate is one or a mixture of more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl isocyanate (PAPI) and dimers, trimers and mixed polymers modified by taking polymethylene polyphenyl isocyanate as a matrix.
Preferably, the polyester polyol comprises polycaprolactone diol (PCL) and/or polycarbonate diol (PCDL) and has a molecular weight of 1000-3000.
Preferably, the crosslinking chain extender comprises one or a mixture of more than one of hydroxyl compounds, amine compounds and carboxylic acid compounds;
The hydroxyl compound comprises one or a mixture of more than one of 1, 4-butanediol, glycerol and ethylene glycol;
The amine compound comprises one or a mixture of more of MOCA, TDA and trimethyl ethylenediamine;
the carboxylic acid compound comprises one or a mixture of more than one of oxalic acid, succinic acid and terephthalic acid.
Preferably, the pore-forming agent comprises pore-forming agent A and/or pore-forming agent B;
The mass ratio of the pore-forming agent A to the pore-forming agent B is (0.2-0.5) to (103.3-198.1).
The pore-forming agent A comprises one or more of water, liquid carbon dioxide, methylene dichloride and cyclopentane;
The pore-forming agent B comprises one or a mixture of more than one of calcium oxide particles, urea particles and solid paraffin particles.
More preferably, the pore-forming agent is pore-forming agent a.
Preferably, the surfactant comprises a foam stabilizer and/or a foam cell opener;
The foam stabilizer comprises one or a mixture of any of AK9905, BF2270, B8629 and DC 198;
the foam pore opening agent comprises one or a mixture of any of AK8805, ortegol, voranol CP1421, H-4002 and Niax L-6164.
Preferably, the slurry solvent comprises one or a combination of more of ethyl acetate, toluene and dimethylformamide.
Preferably, the protective coating layer is an organic polymer solid coating.
The self-adaptive sand control screen has the beneficial effects that the organic high polymer coating can be uniformly dispersed on the surface of the self-adaptive high polymer, so that the self-adaptive high polymer is protected from being damaged by a well wall when the self-adaptive sand control screen is put into the bottom of a well along with the pipe down.
A preparation method of a self-adaptive sand control screen pipe for a weakly cemented reservoir oil and gas well comprises the following steps:
And sleeving the electric heating base pipe in the thin-wall plastic pipe, injecting self-adaptive high-molecular polymer slurry into a gap between the electric heating base pipe and the thin-wall plastic pipe, and uniformly attaching protective paint to the outer surface of the cured self-adaptive high-molecular polymer after the self-adaptive high-molecular polymer slurry is cured, thereby obtaining the self-adaptive sand control screen pipe.
More preferably, the injection method of the self-adaptive high polymer slurry specifically comprises the following steps of uniformly mixing polyester polyol, a crosslinking chain extender, a pore-forming agent, a surfactant and a slurry solvent to obtain a self-adaptive high polymer slurry precursor, continuously stirring at a high temperature of more than 80 ℃ for standby, rapidly injecting polyisocyanate into the self-adaptive high polymer slurry precursor, rapidly stirring uniformly at a high speed to obtain the self-adaptive polymer slurry, rapidly transferring and injecting the self-adaptive polymer slurry into an annular region between an electric heating base pipe and a tetrafluoro plastic pipe, and curing for 8-10 hours at 80-100 ℃.
More preferably, the protective coating layer forming method comprises casting forming, spray forming, reaction injection forming, continuous plate forming and other methods.
The diameter of the thin-wall plastic pipe is larger than that of the electric heating base pipe, the thin-wall plastic pipe only plays a role in assisting in promoting the solidification and forming of the self-adaptive high-molecular polymer slurry, and the high-temperature expansion amount of the self-adaptive high-molecular polymer can be flexibly controlled according to the diameter of a well hole in the actual weakly cemented reservoir oil and gas exploitation engineering, so that the inner diameter size of the tetrafluoro pipe can be selected. After the self-adaptive high polymer slurry is solidified, the thin-wall plastic pipe is taken down, and then protective paint is evenly sprayed on the outer surface of the solidified self-adaptive high polymer.
An application of a self-adaptive sand control screen for an oil and gas well of a weakly cemented reservoir in the weakly cemented reservoir, comprising the following steps:
And after the self-adaptive sand control screen pipe is compressed at high temperature, the self-adaptive sand control screen pipe is connected with a drilling tool and transmitted to the bottom of a well, and then an electric signal is utilized to enable the electric heating base pipe to be heated and expanded to be attached to the well wall, so that engineering application of the self-adaptive sand control screen pipe in the exploitation sand control process of the primary weakly cemented reservoir oil-gas well is completed.
More preferably, after the self-adaptive high-molecular polymer completely fills the annular space of the well wall, the electric signal on the well is removed, and the thermal stimulation of the electric heating base pipe to the self-adaptive high-molecular polymer disappears, so that the mechanical property of the electric heating base pipe caused by continuous high temperature can be effectively prevented from being reduced.
Preferably, the weakly cemented reservoir comprises one of shallow gas such as argillaceous cemented silty sand, unconsolidated argillaceous silty sand, coalbed methane and natural gas hydrate.
Compared with the prior art, the invention has the following advantages and technical effects:
The invention solves the problems of wellbore blockage, near-well stratum collapse and the like existing in the application of the existing sand control mode to the exploitation well of the weak cementing oil and gas reservoir such as muddy silt and the like, and improves the long-term sand control requirement of the unconventional oil and gas reservoir underground by aiming at the incapability of the existing organic high polymer material. The self-adaptive sand control screen pipe for the oil and gas well in the weakly cemented reservoir in the working state can adapt to the control requirement on the particle size of stratum sand in oil and gas resource exploitation sand control on one hand, and can adapt to the diameters of wellbores in various specifications on the other hand, and has a certain supporting effect on the wellwall while completely fitting the wellwall. The requirement of wall protection and sand prevention in the oil and gas exploitation of the weakly cemented reservoir can be met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic illustration of a self-adapting sand control screen of embodiment 15 of the present invention;
FIG. 2 is a schematic illustration of the structure of an adaptive sand control screen according to embodiment 15 of the present invention;
FIG. 3 is a schematic view of the adaptive sand control screen of example 15 of the present invention in a downhole configuration;
FIG. 4 is a schematic view of the adaptive sand control screen of embodiment 15 of the present invention during normal operation;
The anti-sand screen comprises a connector 1, a protective coating layer 2, a self-adaptive high polymer layer 3, an electric heating base pipe 4, an inner layer 5, a middle interlayer 6, an outer layer 7 of high-heat-conductivity-coefficient materials, a production sleeve 8, a pumping pipe 9, a compressed self-adaptive high polymer layer 10, an electric heating base pipe 11 with slits, a self-adaptive high polymer 12 in a working state and a self-adaptive sand screen 13.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The raw material sources used in the embodiment of the invention comprise:
The foam cell opener AK8805 is manufactured by Jiangsu meisi chemical Co., ltd;
foam stabilizer AK9905 is produced by Jiangsu Mei Si chemical Co., ltd;
Diphenylmethane diisocyanate (MDI), model 100ll, jining, medium chemical industry limited;
Polycarbonate diol (PCDL), jining Medium chemical Co., ltd, molecular weight 1000;
1,4 butanediol, the model BDO of the company of the Sjog sciences Co., ltd;
Ethyl acetate is selected as a solvent of the self-adaptive high-molecular polymer slurry precursor liquid, and is purchased from the company of the sciences of the ridge;
The pore-forming agent B-1 is commercial calcium oxide particles with the particle size of 300um;
the pore-forming agent B-2 is commercial calcium oxide particles with the particle size of 100um;
The pore-forming agent B-3 is commercially available polyethylene wax solid particles with the particle size of 100um.
The main body tube of the electric heating base tube in the embodiment of the invention is a commercially available electric heating tube.
Example 1
The preparation method of the self-adaptive high molecular polymer comprises the following steps:
25g of polycarbonate diol (PCDL) softened in an environment of 80 ℃ is uniformly stirred and mixed with 8.63g of 1,4 Butanediol (BDO), 0.5g of pore-forming agent A (distilled water), 0.6g of foam pore-opening agent AK8805 and 0.3g of foam stabilizer AK9905 at a high mechanical rotation speed of a variable frequency high-speed stirrer, and a solvent is not added, so that a self-adaptive high-molecular polymer slurry precursor is obtained. A further 34.8g of diphenylmethane diisocyanate (MDI) was added to the adaptive high molecular polymer slurry precursor. And (3) obtaining self-adaptive high-molecular polymer slurry after high-speed stirring, and then curing for 8 hours at 80 ℃ to obtain the self-adaptive high-molecular polymer.
The glass transition temperature of the adaptive high molecular polymer obtained in this example was 59.8 ℃. Has good pore structure, and the pore diameter distribution is between 0.07 and 372um, wherein the maximum ratio is 1.61um, which reaches more than 10.2 percent. The sand control device can be suitable for sand control precision of most oil and gas wells.
The self-adaptive high molecular polymer obtained in the embodiment has good self-adaptive characteristics. Above the glass transition temperature, the radial deformation of the self-adaptive high polymer is limited, the external axial force is applied to enable the self-adaptive high polymer to be compressed to a position with the height of 40%, and the axial force is kept until the sample is cooled. And then applying a temperature stimulus above a glass transition temperature to the compressed self-adaptive high-molecular polymer. The adaptive expansion rate of the adaptive high molecular polymer in this example was found to be 100%, and the adaptive expansion time was found to be less than 30 minutes at 120 ℃.
Samples of the adaptive high molecular polymer obtained by the formulation of the example were obtained by applying axial restraint in two different states of 80% L and 100% L of adaptive expansion, and the permeation characteristics thereof were measured. The permeability test method refers to the GB/T34533-2017 standard, and finally discovers that the permeability of the self-adaptive high polymer with the self-adaptive expansion of 80 percent L is lower than 8.37D without self-adaptive compression, but still can reach 5.88D, which indicates that the self-adaptive high polymer in the state still has good seepage characteristics. In the state of self-adaptive expansion of 100% L, the permeability is as high as 10.44D, which is higher than the expansion rate before self-adaptive compression.
Example 2
An adaptive high molecular polymer is different from example 1 in that the raw materials comprise 25g of polycaprolactone diol, 9.51g of 1,4 butanediol, 0.2g of 0.5g of pore-forming agent A (distilled water), 0.75g of foam pore-forming agent AK8805, 2g of foam stabilizer AK9905 and 36.92g of diphenylmethane diisocyanate (MDI), and no solvent is added. Other process steps and parameters were the same as in example 1.
The performance detection method is the same as that of the embodiment 1, the permeability of the self-adaptive high polymer in the hydrate exploitation process in the embodiment can reach 4.44D, the compressive strength is 0.95MPa, and the self-adaptive expansion rate can reach 97.4%.
Example 3
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 18:25:3:20, and no surfactant is added;
The mass ratio of the polyester polyol to the pore-forming agent B-1 is 1:4.3;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 4
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 18:25:3:25, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 is 1:6.4;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 5
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 18:25:3:43, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-2 is 1:3.4:1.7;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 6
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (liquid paraffin) is 18:25:3:60, and no surfactant is added;
The mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-2 is 1:4:0.8;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 7
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 18:25:3:80, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:4.8:2.4;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 8
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 5:5:1:20, and no surfactant is added;
The mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:5.8:3;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 9
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:120, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:7.4:3.8;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 10
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:60, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:5:1.2;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 11
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:60, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:5.4:1.1;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 12
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:60, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:5.8:1;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 13
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:60, and no surfactant is added;
The mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:6:0.9;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
Example 14
An adaptive high molecular polymer is different from example 1 in that the mass ratio of polyisocyanate (diphenylmethane diisocyanate (MDI)), polyester polyol (polycarbonate diol (PCDL)), cross-linking chain extender (1, 4 butanediol), solvent (ethyl acetate) is 38:25:9:60, and no surfactant is added;
the mass ratio of the polyester polyol to the pore-forming agent B-1 to the pore-forming agent B-3 is 1:6.2:0.8;
in the curing process of the self-adaptive high polymer slurry, a vacuum drying oven is adopted, the temperature is kept at 80 ℃, and the curing time is 10 hours;
other process steps and parameters were the same as in example 1.
The technical effects are as follows:
The permeability, compressive strength and adaptive expansion rate of the adaptive high molecular weight polymers obtained in examples 3 to 14 were measured, and the test results are shown in Table 1. Wherein the permeability test method is referred to the GB/T34533-2017 standard, the compressive strength measurement method is referred to the GB50107-2010 standard, and the adaptive expansion ratio measurement method is referred to the test method in example 1.
TABLE 1
As can be seen from Table 1, the self-adaptive high molecular polymers obtained in examples 3-4, examples 5-6 and examples 7-14 have higher mechanical strength and permeability under different pore-forming agent proportions. In examples 3 to 14, the solvent mass percentages of the precursor solution for adding the adaptive high molecular polymer are different due to the different types and mass percentages of the pore-forming agent. In examples 10-12, the pore-forming agent combination of the self-adaptive high-molecular polymer is a mixture of pore-forming agent B-1 and pore-forming agent B-3, and the obtained self-adaptive high-molecular polymer has higher permeability which can reach 13.4D at most. In examples 13-14, the pore-forming agent combination of the self-adaptive high-molecular polymer is a combination of the pore-forming agent B-1 and the pore-forming agent B-3, and the obtained self-adaptive high-molecular polymer has higher compressive strength and fluctuates around 4.5 MPa.
Example 15
The preparation method of the self-adaptive sand control screen pipe for the weakly cemented reservoir oil and gas well prepares the self-adaptive high molecular polymer according to the raw material proportion in the embodiments 1-14, and comprises the following steps:
(1) Weighing polyester polyol, a crosslinking chain extender, other pore-forming agents and surfactants added according to a certain proportion, and the like to obtain a self-adaptive high-molecular polymer slurry precursor, continuously stirring or standing at a high temperature of more than 80 ℃ for standby, and waiting for injecting polyisocyanate.
(2) A tetrafluoro thin-wall plastic tube of different inner diameters of the same height as the electrically heated base tube was prepared. The inner diameter of the tetrafluoro thin-wall plastic pipe should be obviously larger than the outer diameter of the base pipe. And (3) rapidly injecting polyisocyanate into the self-adaptive high-molecular polymer slurry precursor liquid obtained in the step (1), rapidly transferring the polymer slurry to an annular region between the electric heating base pipe and the tetrafluoro plastic pipe after high-speed stirring, and maintaining the temperature at 80-100 ℃ for curing for more than 8 hours. And removing the tetrafluoro thin-wall plastic pipe after the self-adaptive high polymer slurry is solidified, and uniformly spraying an outer protective coating on the outer surface of the self-adaptive high polymer to obtain the self-adaptive sand control screen pipe for the weakly cemented reservoir oil and gas well.
As shown in figures 1-2, the structure of the self-adaptive sand control screen pipe for the weakly cemented reservoir oil and gas well is that the self-adaptive sand control screen pipe sequentially comprises an electric heating base pipe 4, a self-adaptive high polymer layer 3 and a protective paint layer 2 from inside to outside.
The electric heating base pipe comprises a main pipe and connectors 1, wherein the connectors are arranged at two ends of the main pipe, the electric heating base pipe is connected with a drill rod, a drill collar, a reamer and the like through the connectors, and the connection mode of the connection comprises but is not limited to plug-in type or screw thread type.
The main body pipe comprises an inner layer, a middle interlayer 5 and an outer layer 7 of high-heat-conductivity-coefficient material from inside to outside, wherein the outer layer of the high-heat-conductivity-coefficient material is made of a metal composite material, is a good conductor of heat, has high temperature resistance and high corrosion resistance, has an inert surface and does not react with the self-adaptive high-molecular polymer.
The middle interlayer inner wall comprises an electric heating wire, and the electric heating wire can receive electric signals and convert the electric signals into thermal signals so as to play a role in heating.
Example 16
As shown in fig. 3-4, an application of the adaptive sand control screen for a weakly cemented reservoir oil and gas well, which is obtained by using the adaptive sand control screen for a weakly cemented reservoir oil and gas well in example 15, may be applied to a range including shallow gas such as argillaceous fine sand, unconsolidated argillaceous fine sand, and weakly cemented reservoirs such as coalbed methane, and natural gas hydrate, and the specific application method includes the following steps:
(1) In the radial compressor, radial compression of the self-adaptive high polymer layer and the outer protective coating layer of the outer self-adaptive high polymer layer of the electric heating base pipe of the self-adaptive sand control screen pipe is realized by applying the height Wen Weiya, and axial deformation does not occur;
wherein the ambient temperature at which the confining pressure is applied is 20 ℃ or more above the glass transition temperature of the adaptive high molecular polymer. The confining pressure is applied through liquid or gas, and the compression amount of the self-adaptive high polymer in the radial compressor is changed by adjusting the size of the confining pressure.
(2) The self-adaptive sand control screen pipe of the compressed weakly cemented reservoir oil and gas well is connected with a drilling tool through an upper connector and a lower connector of an electric heating base pipe and then is put into the bottom of the well, electric stimulation is applied to the well and is transmitted to the electric heating base pipe through a drill pipe, the electric heating base pipe senses an electric signal and converts the electric signal into a thermal signal, the compressed self-adaptive high polymer senses the thermal stimulation and expands and can be completely attached to the well wall, a pore seepage channel is formed and plays a certain supporting role on the well wall, and then engineering application of the self-adaptive sand control screen pipe in the exploitation sand control process of the weakly cemented reservoir oil and gas well is completed.
The self-adaptive high-molecular polymer completely fills the annular space of the well wall, and then the electrical signal on the well is removed, so that the thermal stimulation of the electric heating base pipe to the self-adaptive high-molecular polymer disappears, and the mechanical property of the electric heating base pipe caused by continuous high temperature can be effectively prevented from being reduced.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (4)
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| US8528640B2 (en) * | 2009-09-22 | 2013-09-10 | Baker Hughes Incorporated | Wellbore flow control devices using filter media containing particulate additives in a foam material |
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| CN106397725B (en) * | 2016-08-30 | 2019-05-07 | 天津军星管业集团有限公司 | Utilize recycling waste hard polyurethane foam production insulating tube material, insulating tube and production method |
| CN111763416B (en) * | 2020-06-23 | 2022-04-12 | 中交上海三航科学研究院有限公司 | Water-dispersion-resistant polyurethane rigid foam grouting water-stop reinforcing material and preparation method thereof |
| CN115370326A (en) * | 2021-05-19 | 2022-11-22 | 中国石油天然气股份有限公司 | Expanded particles, completion pipe string filled with expanded particles and method for filling completion with expanded particles |
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