CN115370326A - Expanded particles, completion pipe string filled with expanded particles and method for filling completion with expanded particles - Google Patents
Expanded particles, completion pipe string filled with expanded particles and method for filling completion with expanded particles Download PDFInfo
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- CN115370326A CN115370326A CN202110545208.1A CN202110545208A CN115370326A CN 115370326 A CN115370326 A CN 115370326A CN 202110545208 A CN202110545208 A CN 202110545208A CN 115370326 A CN115370326 A CN 115370326A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The invention discloses expanded particles, a well completion pipe string filled with the expanded particles and a method for filling the well completion with the expanded particles, wherein the expanded particles are prepared by preparing shape memory polymer into open-cell foam with the aperture of 0.05-0.35 mm and the porosity of 10-90% by a physical foaming mode, and then compressing at high temperature, cooling and shaping; the excitation temperature of the expanded particles is greater than the reservoir temperature; and the size of the expanded particles is smaller than the diameter of the shaft pore canal and larger than the gap width or mesh diameter of the sand control screen pipe. The method comprises the following steps: lowering the inner tubular portion and the outer tubular portion into an oil well, and after cleaning, reducing the temperature within the wellbore to below the excitation temperature of the expanded particles; injecting an expanded particle solution into the washpipe to perform filling so as to obtain the expanded particle filled completion pipe string; injecting high-temperature fluid into the washing pipe, and closing the completion pipe string filled with the expanded particles for 5-24 hours; and injecting normal-temperature fluid into the washing pipe.
Description
Technical Field
The invention relates to the technical field of well completion of development wells, in particular to expanded particles, a well completion string filled with the expanded particles and a method for filling and completing the well with the expanded particles.
Background
The sand production of the oil-gas well refers to a process or a phenomenon that in the production process of the oil-gas well, due to the fact that the rock structure of a stratum near the bottom of the well is changed due to various comprehensive factors such as geological conditions, a mining mode and measure operation, the scattered sand or the dropped sand in the stratum is carried into a shaft or the ground by the produced fluid of the stratum, and therefore a series of adverse effects are caused on the normal production of the oil-gas well.
The sand prevention measures are adopted to solve the sand production problem of the oil and gas well. Gravel pack sand control is currently the most common sand control process used in oil fields. The method is characterized in that a sand control screen pipe is put in a shaft, gravels are filled in the sand control screen pipe and shaft annular space or stratum void zone, and a gravel layer sand blocking barrier is constructed to prevent the stratum from producing sand. Currently, commonly used gravel packing materials include quartz sand and ceramic particles. However, the prior gravel pack sand control process has the following problems: (1) Due to the limitation of the construction process, higher filling compactness cannot be obtained, the stability of the filled gravel layer is poorer, stratum sand easily invades into the gravel layer to cause the blockage of the gravel layer and influence the yield of an oil-gas well, and under the serious condition, a superior channel is formed in the gravel layer to cause the direct erosion of the stratum sand on the sieve tube, so that the sieve tube is damaged and the sand prevention is invalid. (2) To a large amount of sand production, lead to the serious oil gas well of stratum deficit, be difficult to fill up completely in the partial deficit area of nearly well stratum, partial gravel layer is in loose state, in oil gas production process, because the disturbance of oil gas, the gravel layer mixes with the stratum sand easily, leads to the sand control effect variation and output to descend. (3) For a vertical well with a long well section and a non-homogeneous oil layer, a layered gravel packing sand prevention process is required to be adopted to ensure a good packing effect. However, the layered gravel packing process is complex, the technical difficulty is high, and the construction risk is high. (4) For a long well section horizontal well, due to the fact that the density of a conventional gravel material is high, sedimentation is easy to occur in the filling construction process, sand blocking is formed, the filling effect is poor, and the filling construction failure can be caused under the serious condition.
To sum up, the completion string in the prior art has the following problems: the structure is complex, the processing and manufacturing difficulty is high, and the construction risk is high; the filling space is limited, and part of serious sand-producing and void parts and the fracture-cavity oil reservoir are not fully filled; the water-swellable substance has low strength after swelling after water absorption, easy hydrolysis and short effective period.
Therefore, how to develop a well completion filling method with good filling effect and simple process becomes a technical problem to be solved urgently.
Disclosure of Invention
The present invention aims to provide expanded particles, expanded particle-filled completion strings and methods for expanded particle-filled completions, which after filling a wellbore, remain spherical until unexpanded, the expanded particles are in a relatively loosely packed state, there are voids between the particles, and there are also areas that are partially unfilled. In the expansion process of the expanded particles, due to the constraint action of the well wall and the sieve tube, the expanded particles are mutually extruded and expand along gaps among the particles and infilled areas, and finally a sand blocking barrier with high filling degree and high stability is formed; the filling effect is good and the process is simple.
In the first aspect of the invention, the expanded particles are prepared by preparing open-cell foam with the aperture of 0.05-0.35 mm and the porosity of 10-90% from shape memory polymer by a physical foaming mode, and then compressing at high temperature, cooling and shaping; the excitation temperature of the expanded particles is greater than the reservoir temperature; and the size of the expanded particles is smaller than the diameter of the shaft pore canal and larger than the gap width or mesh diameter of the sand control screen pipe.
Further, the shape memory polymer includes at least one of a shape memory epoxy and a shape memory polyurethane.
In a second aspect of the invention, there is provided a hybrid fill particle comprising said expanded particle and an ingredient; the ingredients comprise at least one of ceramsite and expanded particles, and the volume ratio of the expanded particles to the ingredients is 1: (0.2-1).
In a third aspect of the invention, there is provided the use of said expanded particles or said hybrid packing particles as packing material in a completion string.
In a fourth aspect of the invention, there is provided an expanded particle filled completion string comprising:
the inner pipe part comprises a filling sliding sleeve, and a sand control screen pipe and a bottom plug which are connected with each other;
the outer tube part comprises a shaft, a washing tube and a top packer which are arranged in the shaft, and the shaft is coaxially positioned on the periphery of the inner tube part; one end of the flushing pipe is communicated with the shaft, and the other end of the flushing pipe is communicated with the filling sliding sleeve;
expanded particles disposed within the wellbore.
Further, the packing slips are disposed between the top setting tool and the sand screen, or between the sand screen and the bottom plug.
Furthermore, a through hole is formed in the filling sliding sleeve, and the other end of the flushing pipe penetrates through the through hole to be communicated with the filling sliding sleeve.
In a fifth aspect of the invention, there is provided a method of inflating a particulate packed well completion, the method comprising:
putting the inner pipe part and the outer pipe part into an oil well, injecting normal-temperature well washing liquid into the flushing pipe for cleaning, and then reducing the temperature in the shaft to be lower than the excitation temperature of the expanded particles;
uniformly mixing the sand carrying liquid and the expanded particles to obtain an expanded particle solution; injecting the expanded particle solution into the wash pipe to perform packing, thereby obtaining the expanded particle packed completion string;
injecting high-temperature fluid into the washpipe, raising the temperature in the well bore to be higher than the excitation temperature of the expanded particles so as to enable the expanded particles to be in an original state, and closing the completion pipe string filled with the expanded particles for 5-24 hours;
injecting a normal temperature fluid into the washpipe, and reducing the temperature in the wellbore below the excitation temperature of the expanded particles to make the expanded particles in a glassy state.
Further, the method further comprises: and periodically injecting high-temperature fluid into the washing pipe and injecting normal-temperature fluid into the washing pipe.
Furthermore, the filling amount of the expanded particle solution is 0.5-5.0 m 3 And/min, wherein the volume ratio of the expanded particles to the sand carrying liquid is 5-70%.
Furthermore, the sand-carrying liquid adopts KCl salt water solution with the density of 1.05-1.20 g/cm 3 The temperature is 10-25 ℃.
Further, the temperature of the high-temperature fluid is 40-100 ℃.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides expanded particles, a well completion pipe string filled with the expanded particles and a method for filling the well completion with the expanded particles, wherein the expanded particles are prepared by preparing shape memory polymer into open-cell foam with the aperture of 0.05-0.35 mm and the porosity of 10-90% by a physical foaming mode, and then compressing at high temperature, cooling and shaping; the excitation temperature of the expanded particles is greater than the reservoir temperature; and the size of the expanded particles is smaller than the diameter of the shaft pore canal and larger than the gap width or mesh diameter of the sand control screen pipe. The expansion particles are filled in the well bore annular space and the stratum depletion zone, self expansion is realized by utilizing the stratum temperature, a sand blocking barrier with high filling degree, high stability and high flow conductivity is formed, the expansion force of the particles is utilized to support the well wall, and sand grains are prevented from being peeled off and moved, so that a better sand prevention effect is achieved. Specifically, after the expanded particles are filled into a shaft of an oil well, under the stimulation of the underground environment temperature of the oil well, the polymer is softened, the expanded particles expand and recover to the original state (shape A), after the expanded particles are cooled again, the polymer is converted into a glass state again, the glass state is hardened and kept to be fixed, and the expanded particles at the moment are of an open-cell foam structure, have high permeability and high strength and meet the requirement of sand prevention. The excitation temperature of the expanded particles is higher than the oil reservoir temperature, so that the expanded particles can be in a high-strength glassy state instead of an easily deformed molten state after being excited; meanwhile, the construction risk caused by expansion due to the fact that the expansion particles are influenced by the oil reservoir temperature in the filling construction process can be avoided. The size of the expanded particles is smaller than the diameter of the perforation hole channel and is larger than the sand blocking precision of the sand control screen pipe, so that the expanded particles can smoothly enter the perforation hole channel and cannot flow out of a filter gap or a mesh of the screen pipe.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a comparison of expanded particles before and after expansion;
FIG. 2 is a schematic representation of the screen completion string and expanded particles provided in example 4 prior to expansion;
FIG. 3 is a schematic representation of the screen completion string and expanded particles provided in example 4;
FIG. 4 is a schematic representation of the screen completion string and expanded particles provided in example 6 prior to expansion;
FIG. 5 is a schematic representation of the screen completion string and expanded beads provided in example 6;
FIG. 6 is a flow chart of a method of expanding a particle packed well completion according to an embodiment of the present invention;
in the figure, 1-inner tube; 11-filling the sliding sleeve; 12-a sand screen; 13-bottom plug;
2-an outer tube part; 21-a wellbore; 22-washing the pipe; 23-top packer;
3-expanded particles.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be obtained by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to a typical embodiment of the present invention, there is provided an expanded bead, wherein the expanded bead is prepared by preparing a shape memory polymer into an open-cell foam having a pore size of 0.05 to 0.35mm and a porosity of 10 to 90% by a physical foaming method, and then compressing at a high temperature, cooling and shaping; the excitation temperature of the expanded particles is greater than the reservoir temperature; and the size of the expanded particles is smaller than the diameter of the shaft pore canal and larger than the gap width or mesh diameter of the sand control screen pipe.
In this embodiment, the reason why the open-cell foam having a pore diameter of 0.05 to 0.35mm and a porosity of 10 to 90% is used is as follows: if the aperture of the open-cell foam is less than 0.05mm, the discharge of mud and fine silt is not facilitated, and the blockage is easily caused; if the aperture of the open-cell foam is larger than 0.35mm, the sand yield is large, and the sand control effect is poor;
the sand control screen has a sand blocking accuracy, i.e., a screen slot width or a mesh diameter, of usually 0.10 to 0.50mm.
The excitation temperature of the expanded particles is 40-90 ℃, and the excitation temperature refers to the glass transition temperature of the shape memory polymer material for shape recovery. The actual activation temperature of the expanded beads must be greater than the reservoir temperature in order for the expanded beads to be in a high strength glassy state, rather than a readily deformable molten state, after activation.
As a preferred embodiment, the expanded particles can be spherical, square or columnar, preferably spherical particles with the diameter of 2-6 mm, and the spherical structure is favorable for the expanded particles to enter a formation void zone through the perforation tunnels.
As a preferred embodiment, the expanded beads have a density of 1.05 to 1.20g/cm 3 The density of the expanded particles is similar to that of the sand carrying liquid, so that the expanded particles can be completely suspended in the sand carrying liquid, and the expanded particles are kept in good suspension, so that a good filling effect is achieved.
Shape Memory Polymers (SMP) are elastic polymer networks composed of a stationary phase and a high molecular chain segment, the stationary phase determines the permanent shape of the polymer network, the high molecular chain segment is a reversible phase and can be converted into a glass state or a molten state under the action of a transition temperature, the transition temperature is equivalent to a control switch of the shape memory polymer, when the environmental temperature of the polymer is lower than the transition temperature, the molecular chain segment is in a frozen state (glass state), the shape of the material is fixed and unchanged (shape A), and when the environmental temperature of the polymer is higher than the transition temperature, the molecular chain segment is in a high elastic state (molten state) as shown in figure 1, and can be stretched (shape B) under the action of external force, so that the material is subjected to macroscopic deformation. The shape memory polymer is processed to form an original state (shape A); applying a force to the polymer to deform the polymer into an intermediate state (shape B) under an external ambient temperature stimulus; for industrial applications, the polymer returns to its original state (shape a) under external ambient temperature stimuli.
Expanded particles processed using shape memory polymer materials also have the above-described shape transitions: after processing the shape memory polymer into an open cell foam, reducing the ambient temperature below the transition temperature to obtain the original state (shape a) of the expanded particles; then, the expanded particles are heated to a temperature above the transition temperature, the polymer is transformed into a molten state, the expanded particles are softened, pressure is applied to the expanded particles at the moment to perform volume compression, the polymer is transformed into a glassy state after cooling, and the glassy state is cut into particles to obtain an intermediate state (shape B) of the expanded particles; after the expanded particles are filled into a shaft of an oil well, under the stimulation of the underground environment temperature of the oil well, the polymer is softened, the expanded particles expand and recover to the original state (shape A), after being cooled again, the polymer is converted into a glass state, and the glass state is hardened and kept to be shaped, and the expanded particles at the moment are of an open-cell foam structure, have high permeability and high strength, and meet the requirement of sand prevention.
The shape memory polymer comprises one of shape memory epoxy resin or shape memory polyurethane; the expanded particles are made of shape memory epoxy resin or shape memory polyurethane materials because the shape memory recovery performance of the two materials is very good, the strength is high, the excitation temperature is adjustable, and the industrial application is mature. The original state of the expanded particles, even before compression set, is the state after it has been stimulated in the well. It is an open-cell foam structure with high permeability that allows crude oil to pass through it while blocking formation sand from passing through it. The pore size of the foam is designed to be 0.05-0.35 mm, and most of oil well stratum sand can be blocked. The excitation temperature of the expanded particles must be higher than the temperature of the oil reservoir, so that the expanded particles can be in a high-strength glassy state instead of an easily deformable molten state after being excited; meanwhile, the construction risk caused by expansion due to the fact that the expansion particles are influenced by the oil reservoir temperature in the filling construction process can be avoided. The size of the expanded particles is smaller than the diameter of the perforation hole channel and is larger than the sand blocking precision of the sand control screen pipe, so that the expanded particles can smoothly enter the perforation hole channel and cannot flow out of a filter gap or a mesh of the screen pipe.
In this embodiment, the temperature in the high-temperature compression is usually 60 ℃ to 100 ℃; the cooling and shaping can be carried out at normal temperature or in cooling water.
According to an exemplary embodiment of the present invention, there is provided a hybrid fill particle comprising the expanded particle and an ingredient; the ingredients comprise at least one of ceramsite and expanded particles, and the volume ratio of the expanded particles to the ingredients is 1: (0.2-1).
According to another exemplary embodiment of the present invention, there is provided an expanded particle filled completion string, as shown in fig. 2-5, comprising:
the inner pipe part 1 comprises a filling sliding sleeve 11, a sand control screen pipe 12 and a bottom plug 13 which are connected with each other;
the outer pipe part 2 comprises a shaft 21, a washpipe 22 and a top packer 23 which are arranged in the shaft 21, and the shaft 21 is coaxially arranged on the periphery of the inner pipe part 1; one end of the flushing pipe 22 is communicated with the shaft 21, and the other end is communicated with the filling sliding sleeve 11;
expanded particles 3 disposed within the wellbore 21.
With the sand screen 12 in the target reservoir interval. Preferably, the sand control screen 12 is a slotted screen, a wire-wrapped screen, a star-hole sintered screen, or a metal mesh composite screen.
As an alternative embodiment, the packing slips are placed between the top setting tool and the sand screen as shown in fig. 2-3, or between the sand screen and the bottom plug as shown in fig. 4-5.
As an optional implementation manner, a through hole is formed in the filling sliding sleeve, and the other end of the flushing pipe penetrates through the through hole to be communicated with the filling sliding sleeve.
According to another exemplary embodiment of the present invention, there is provided a use of said expanded particles or said hybrid packing particles as packing material in a completion string.
According to another exemplary embodiment of the present invention, there is provided a method of inflating a particle-packed well completion, as shown in fig. 6, the method comprising:
s1, putting the inner pipe part and the outer pipe part into an oil well, injecting normal-temperature well washing liquid into the flushing pipe for cleaning, and then reducing the temperature in the shaft to be lower than the excitation temperature of expanded particles;
the step S1 specifically includes:
a screen completion string is run into the well with the sand screen in the target reservoir interval. After the packer is set, a wash pipe is put into the screen pipe well completion pipe string, and the filling sliding sleeve is opened.
S2, uniformly mixing the sand carrying liquid and the expanded particles to obtain an expanded particle solution; injecting the expanded particle solution into the wash pipe to perform packing, thereby obtaining the expanded particle packed completion string;
in the step S2:
the sand-carrying liquid adopts KCl salt water solution with the density of 1.05-1.20 g/cm 3 The temperature is 10-25 ℃. The density of the expanded particles is 1.05-1.20 g/cm 3 The density of the sand carrier is the same as that of the sand carrier, and the sand carrier can be completely suspended in the sand carrier. The sand carrying liquid can also adopt a guanidine gum solution with the viscosity of 50-300 mPa.s, and the viscosity of the guanidine gum sand carrying liquid is utilized to ensure the suspension property of the expanded particles. The sand-carrying fluid is used for filling expansion particles to the outer side of the sand control screen pipe,and filling expanded particles in the formation depletion zone, the formation fracture holes, the perforation tunnels and the shaft annulus along with the filling process.
The volume ratio of the expanded particles to the sand-carrying fluid is 5-70%; if the volume ratio is less than 5%, the filling efficiency is low, the dosage of the sand carrying liquid is large, the construction time is long, and if the volume ratio is more than 70%, the expansion particles are easy to block in the process of entering the pore channel.
The filling amount of the expanded particle solution is 0.5-5.0 m 3 Min, filling amount is less than 0.5m 3 Min, low filling efficiency, large using amount of sand carrying liquid and long construction time; if the filling amount is more than 5m 3 Min, easily causing blockage in the filling process of the expanded particles;
s3, injecting high-temperature fluid into the washpipe, increasing the temperature in the shaft to be higher than the excitation temperature of the expanded particles so as to enable the expanded particles to be in an original state, and closing the completion pipe string filled with the expanded particles for 5-24 hours;
at this stage, the expanded particles expand and return to their original state when excited by the temperature. Preferably, the high temperature fluid is treated and heated oilfield wastewater, or hot oil. The temperature of the high-temperature fluid is 40-100 ℃. Preferably, the temperature of the high temperature fluid is 5 to 10 ℃ above the actual excitation temperature of the expanded particles.
And S4, injecting normal-temperature fluid into the washpipe, and reducing the temperature in the shaft to be lower than the excitation temperature of the expanded particles so as to enable the expanded particles to be in a glass state.
Normal temperature fluid is injected from the washing pipe, the temperature of the shaft is reduced to be lower than the excitation temperature of the expanded particles, so that polymer molecular chains are in a frozen state, the expanded particles can keep an original expanded state for a long time, and the expanded particles have higher strength and meet the sand prevention requirement. Preferably, the normal temperature fluid is oil field sewage which is treated and cooled to normal temperature.
The method further comprises the following steps: and repeating the step S3 and the step S4, namely periodically injecting high-temperature fluid into the wash pipe and injecting normal-temperature fluid into the wash pipe. High temperature fluid and normal temperature fluid can be injected periodically during the production process of the oil well. On one hand, the well is washed and the blockage of the wellhole and the expanded particles is removed; on the other hand, the expanded particles are allowed to expand again, filling in the new depletion zone caused by the sand production. Thereby achieving the purpose of prolonging the effective period of sand prevention.
After the expanded particles are filled into the wellbore, they remain spherical until unexpanded, the expanded particles are in a relatively loosely packed state, there are voids between the particles, and there are also areas that are partially unfilled. In the expansion process of the expansion particles, due to the constraint action of the well wall and the sieve tube, the expansion particles are mutually extruded and expand along gaps among the particles and infilled areas, and finally the sand blocking barrier with high filling degree and high stability is formed.
A detailed description of an expanded particle-filled completion string and a method of making the same according to the present application will now be provided in conjunction with examples, comparative examples, and experimental data.
Example 1
The expanded particles are made of shape memory epoxy resin, 100g of epoxy resin is taken, 5g of polyethylene polyamine curing agent and 70g of NaCl particles (the particle size is 0.25 mm) are added, the mixture is heated to 90 ℃, and the mixture is mixed and stirred. After curing for 24h, putting the mixture into clear water for 24h to fully dissolve NaCl particles to obtain the shape memory epoxy resin foam with the glass transition temperature of 60-80 ℃. The shape memory epoxy foam is then compacted by heating to 90 c and applying pressure.
Cutting the shape memory epoxy resin foam into the foam with the diameter of 6mm and the density of 1.10g/cm by using a cutting machine 3 The expanded particles of (1).
The expanded particles can perform self-expansion at the ambient temperature of 60-80 ℃, the expansion volume can reach 4 times, foam with an open-cell structure is formed after expansion, the pore diameter of the foam is 0.25mm, and the porosity is about 50%. The principle of expansion of expanded particles is shown in figure 1: the expanded particles are thermally activated to expand, form a spherical shape after expansion without binding force, and have filtering pores.
Example 2
The expanded particles are made of shape memory polyurethane, 100g of polycarbonate diol is added with 200g4,4 diphenyl diisocyanate,5g of 1-4 butanediol, 1g of dimethylthiotoluenediamine, 0.2g of stannous octoate and 50g of NaCl particles (particle size of 0.30 mm) are heated to 60 ℃, mixed and stirred. Heating to 100 ℃, curing for 10h, and then putting into clear water for 24h to fully dissolve NaCl particles to obtain the shape memory polyurethane foam with the glass transition temperature of 70-90 ℃. Then heated to 100 c and pressurized to compact the shape memory epoxy foam. Cutting the shape memory epoxy resin foam into the foam with the diameter of 6mm and the density of 1.08g/cm by using a cutting machine 3 The expanded particles of (1). The expanded particles can perform self-expansion at the ambient temperature of 70-90 ℃, the expansion volume can reach 2.8 times, and foam with an open-cell structure is formed after expansion, the pore diameter of the foam is 0.30mm, and the porosity is about 36%. The principle of expansion of expanded particles is shown in figure 1: the expanded particles are thermally activated to expand, and form a spherical shape after expansion without constraint force, and the expanded particles have filtering pores.
Example 3
The embodiment of the invention provides mixed filling particles, wherein the expanded particles in the embodiment 1 and quartz sand with the particle size of 0.45-0.85 mm are selected and mixed, the mixing proportion is specifically that the volume ratio is 1. After the sand blocking barrier is filled into the stratum and the shaft, the expansion particles expand to form a high-strength and high-filling-degree sand blocking barrier together with the quartz sand.
Example 4
The expanded particles are used for filling sand control completion in a vertical well.
Oil well parameters: the well depth of the oil well is 1100m, the oil layer temperature is 56 ℃, and the well bore size is 5/2 ".
As shown in FIG. 2, the screen completion string structure is composed of a packer, a packing sleeve, a sand screen and a plug from top to bottom, wherein the sand screen is located in a target reservoir interval. The sand control screen pipe adopts a slotted screen pipe with the sand blocking precision of 0.25 mm.
The expanded particles in example 1 were selected for filling, and the specific construction steps were as follows:
(1) Screen pipe running completion pipe string and wash pipe
A screen completion string is run into the well with the sand screen in the target reservoir interval. After the packer is set, a wash pipe is put into the screen pipe well completion pipe string, and the filling sliding sleeve is opened.
(2) Normal temperature fluid circulation well washing
And injecting the treated oilfield sewage from the washing pipe, wherein the sewage temperature is 25 ℃, and circularly washing the well for more than 2 weeks until the returned sewage does not contain impurities, and the temperature of the injected sewage is consistent with that of the returned sewage, so that the purposes of cleaning impurities in the shaft and reducing the temperature of the shaft to be below the excitation temperature of the expanded particles are achieved.
(3) Filled expanded particles
Adopting the treated oil field sewage, adding KCl particles to prepare the oil field sewage with the density of 1.10g/cm 3 And the temperature is 25 ℃. And the sand-carrying liquid is utilized to fill the expansion particles to the outer side of the sand-proof sieve tube through the filling sliding sleeve. According to the filling discharge capacity of 1.5-3.0 m 3 And/min, performing filling construction operation according to construction parameters of 15-35% (volume ratio) of filling sand ratio, stopping filling construction when the well head filling pressure reaches 20MPa, lifting the flushing pipe, and closing the filling sliding sleeve.
(4) Injecting high-temperature fluid
Injecting the treated and heated high-temperature oilfield sewage from the washing pipe, wherein the temperature of the sewage is 80 ℃, and the injection volume is 5-20 m 3 Heating the shaft to the same temperature as the injected high-temperature sewage to reach the temperature above the excitation temperature of the expanded particles, and closing the well for 12 hours. At this stage, the expanded particles expand and return to their original state when excited by the temperature.
(5) Injecting normal temperature fluid
Injecting the treated oil field sewage from the washing pipe at 25 deg.c and 5-20 m in volume 3 The temperature of the shaft is cooled to be the same as that of injected normal-temperature sewage, and the temperature is lower than the excitation temperature of the expanded particles, so that polymer molecular chains are in a frozen state, the expanded particles can keep an original expanded state for a long time, have higher strength and meet the sand prevention requirement.
(6) Periodically injecting high-temperature fluid and normal-temperature fluid
High temperature fluid and normal temperature fluid can be injected periodically during the production process of the oil well. On one hand, the well washing and blockage removing are carried out on the well bore and the expanded particles; on the other hand, the expanded particles are expanded again to fill the new depletion zone caused by the sand production. Thereby achieving the purpose of prolonging the effective period of sand control.
Example 5
The expanded particles and the quartz sand are mixed and compounded, and filling sand control completion is carried out in a vertical well.
Oil well parameters: the well depth of the oil well is 1000m, the oil layer temperature is 53 ℃, and the borehole size is 5/2'.
As shown in FIG. 2, the screen completion string structure is composed of a packer, a packing sleeve, a sand screen and a plug from top to bottom, wherein the sand screen is located in a target reservoir interval. The sand control screen pipe adopts a slotted screen pipe with the sand blocking precision of 0.25 mm.
The mixed filling particles in the embodiment 3 are selected for filling operation, and the specific construction steps are as follows:
(1) Screen pipe running completion pipe string and washing pipe
A screen completion string is run into the well with the sand screen in the target reservoir interval. After the packer is set, a wash pipe is put into the screen pipe well completion pipe string, and the filling sliding sleeve is opened.
(2) Normal temperature fluid circulation well washing
And injecting the treated oilfield sewage from the washing pipe, wherein the sewage temperature is 25 ℃, and circularly washing the well for more than 2 weeks until the returned sewage does not contain impurities, and the temperature of the injected sewage is consistent with that of the returned sewage, so that the purposes of cleaning impurities in the shaft and reducing the temperature of the shaft to be below the excitation temperature of the expanded particles are achieved.
(3) Filled expanded particles
Adopting the treated oil field sewage, adding KCl particles and guar gum powder to prepare the mixture with the density of 1.05g/cm 3 A viscosity of 50-200 mPa.S, a temperature of 25 ℃. The expanded particles in the embodiment 1 are mixed and compounded with quartz stone with the particle size of 0.45-0.85 mm to obtain mixed filling particles. And adding the mixed filling particles into the sand-carrying liquid, and filling the mixed filling particles to the outer side of the sand-proof sieve tube through a filling sliding sleeve. According to the filling discharge capacity of 1.5-3.0 m 3 Min, filling sand ratio15-35% (volume ratio) of construction parameters, stopping filling construction when the well head filling pressure reaches 20MPa, lifting the flushing pipe, and closing the filling sliding sleeve.
(4) Injecting high temperature fluid
Injecting the treated and heated high-temperature oilfield sewage from the washing pipe, wherein the temperature of the sewage is 80 ℃, and the injection volume is 5-20 m 3 Heating the shaft to the same temperature as the injected high temperature sewage to reach the temperature over the exciting temperature of the expanded particles, and closing the well for 12 hours. At this stage, the expanded particles expand and return to their original state when excited by the temperature.
(5) Injecting normal temperature fluid
Injecting the treated oil field sewage from the washing pipe at 25 deg.c and 5-20 m in volume 3 The temperature of the shaft is cooled to the same temperature as that of the injected normal-temperature sewage, and the temperature is lower than the excitation temperature of the expanded particles, so that polymer molecular chains are in a frozen state, the expanded particles can keep an original expanded state for a long time, and the expanded particles have higher strength and meet the sand prevention requirement.
(6) Periodically injecting high-temperature fluid and normal-temperature fluid
High temperature fluid and normal temperature fluid can be injected periodically during the production process of the oil well. On one hand, the well is washed and the blockage of the wellhole and the expanded particles is removed; on the other hand, the expanded particles are expanded again to fill the new depletion zone caused by the sand production. Thereby achieving the purpose of prolonging the effective period of sand prevention.
Example 6
And filling the horizontal well with the expanded particles to prevent sand and complete the well.
Oil well parameters: the well depth of the oil well is 1500m, the oil layer temperature is 67 ℃, and the borehole size is 7'.
As shown in FIG. 3, the screen completion string structure is composed of a packer, a sand screen, a packing sleeve and a plug from top to bottom, wherein the sand screen is located in a target reservoir interval. The sand control screen pipe adopts a star hole sintering screen pipe with the sand blocking precision of 0.25 mm.
The expanded particles in example 2 were selected for filling, and the specific construction steps were as follows:
(1) Screen pipe running completion pipe string and washing pipe
A screen completion string is run into the well with the sand screen in the target reservoir interval. After the packer is set, a wash pipe is put into the screen pipe well completion pipe string, and the filling sliding sleeve is opened.
(2) Normal temperature fluid circulation well washing
And injecting the treated oilfield sewage from the flushing pipe, wherein the temperature of the sewage is 25 ℃, and circularly flushing the well for more than 2 weeks until the returned sewage does not contain impurities, and the temperature of the injected sewage is consistent with that of the returned sewage, so that the purposes of cleaning impurities in the shaft and reducing the temperature of the shaft to be below the excitation temperature of the expanded particles are achieved.
(3) Filled expanded particles
Adopting the treated oil field sewage, adding KCl particles to prepare the oil field sewage with the density of 1.10g/cm 3 And the temperature is 25 ℃. And filling the expansion particles outside the sand control screen pipe by using the sand carrying liquid through the filling sliding sleeve. According to the filling discharge capacity of 2.0-3.5 m 3 And/min, performing filling construction operation according to construction parameters of 15-35 percent (volume ratio) of filling sand ratio, stopping filling construction when the well head filling pressure reaches 20MPa, lifting the flushing pipe, and closing the filling sliding sleeve.
(4) Injecting high-temperature fluid
Injecting the treated and heated high-temperature oilfield sewage from the washing pipe, wherein the temperature of the sewage is 80 ℃, and the injection volume is 20-50 m 3 Heating the shaft to the same temperature as the injected high temperature sewage to reach the temperature over the exciting temperature of the expanded particles, and closing the well for 12 hours. At this stage, the expanded particles expand and return to their original state when excited by the temperature.
(5) Injecting normal temperature fluid
Injecting the treated oil field sewage from the washing pipe, wherein the temperature of the sewage is 25 ℃, and the injection volume is 20-50 m 3 The temperature of the shaft is cooled to the same temperature as that of the injected normal-temperature sewage, and the temperature is lower than the excitation temperature of the expanded particles, so that polymer molecular chains are in a frozen state, the expanded particles can keep an original expanded state for a long time, and the expanded particles have higher strength and meet the sand prevention requirement.
(6) Periodically injecting high-temperature fluid and normal-temperature fluid
High temperature fluid and normal temperature fluid can be injected periodically during the production process of the oil well. On one hand, the well is washed and the blockage of the wellhole and the expanded particles is removed; on the other hand, the expanded particles are allowed to expand again, filling in the new depletion zone caused by the sand production. Thereby achieving the purpose of prolonging the effective period of sand control.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
1. compared with the conventional gravel packing sand control completion technology, the expanded particles are adopted to replace the traditional packing materials such as quartz sand, ceramsite and the like, and the method has three technical advantages: firstly, the expansion property is that the expansion particles can realize self-expansion and volume increase in an underground temperature environment, stronger extrusion force can be generated between the particles and a well wall, and a void area which is not completely filled is eliminated, so that a sand blocking barrier with high filling degree and high stability is formed, the well wall can be supported by the self-expansion force of the particles, sand grains are prevented from being peeled off and moved, and a better sand prevention effect is achieved; the expanded particles are low in density, close to the density of the sand carrying liquid, can be completely suspended in the sand carrying liquid, are very favorable for filling operation of long well sections, heterogeneous vertical wells and horizontal wells of long well sections, can ensure the filling effect of the oil wells and reduce the filling construction risk; and thirdly, the conductivity is high, the porosity of the sand blocking barrier formed by the traditional filling material is generally only 15% -25%, the porosity of the sand blocking barrier formed by the completely expanded particles can reach 90%, and therefore the sand blocking barrier has good permeability and conductivity and has little influence on the yield of an oil well.
2. Compared with the existing filling-free expandable screen pipe well completion technology, the filling-free expandable screen pipe well completion technology has the advantages that the expanded particle filling technology is adopted, the stratum depletion zone can be filled, the filling area is larger, the filling effect of 'no dead angle' can be realized, a thicker sand blocking barrier is formed, and the filling effect and the sand prevention effect in a serious depletion well and a fracture-cavity oil reservoir well are better.
3. Compared with the existing open hole well outer wrapping expansion filling sand control method, the construction process is simpler, the operation risk is smaller, the filling area is larger, the filling effect of 'no dead angle' can be realized, and a thicker sand blocking barrier is formed.
4. Compared with the existing particulate matter filling well completion pipe column and the particulate matter filling well completion method for the development well, the invention has the advantages that the construction operation risk is smaller, the filling area is larger, and the filling effect of 'no dead angle' can be realized; compared with the water-swellable material, the shape memory polymer material adopted by the swelling particles has higher strength, is not easy to hydrate and has longer effective period.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. The expanded particles are characterized in that the expanded particles are prepared by preparing shape memory polymers into open-cell foam with the aperture of 0.05-0.35 mm and the porosity of 10-90% in a physical foaming way, and then compressing at high temperature, cooling and shaping; the excitation temperature of the expanded particles is greater than the reservoir temperature; and the size of the expanded particles is smaller than the diameter of the shaft pore canal and larger than the gap width or mesh diameter of the sand control screen pipe.
2. An expanded granule according to claim 1, wherein the shape memory polymer comprises at least one of a shape memory epoxy and a shape memory polyurethane.
3. A hybrid fill particle comprising the expanded particle of any of claims 1-2 and an ingredient; the ingredients comprise at least one of quartz stone and ceramsite, and the volume ratio of the expanded particles to the ingredients is 1: (0.2-1).
4. Use of the expanded particles of any of claims 1-2 or the hybrid packing particles of claim 3 as packing material in a completion string.
5. An expanded particle filled completion string, comprising:
the inner pipe part comprises a filling sliding sleeve, and a sand control screen pipe and a bottom plug which are connected with each other;
the outer tube part comprises a shaft, a washing tube and a top packer which are arranged in the shaft, and the shaft is coaxially positioned on the periphery of the inner tube part; one end of the flushing pipe is communicated with the shaft, and the other end of the flushing pipe is communicated with the filling sliding sleeve;
the expanded particles of any one of claims 1-2 or the hybrid packed particles of claim 3 disposed in the wellbore.
6. The expanded particle filled completion string of claim 5, wherein the slip-on-packing is disposed between the top setting tool and the sand screen or between the sand screen and the bottom plug.
7. The completion string filled with expanded particles as claimed in claim 5, wherein the filling sliding sleeve is provided with a through hole, and the other end of the washpipe passes through the through hole and is communicated with the filling sliding sleeve.
8. A method of inflating a particulate packed well completion, the method comprising:
lowering the inner tubular portion and the outer tubular portion of any one of claims 5 to 7 into an oil well, injecting a normal temperature flushing fluid into the flushing pipe to clean the flushing pipe, and then reducing the temperature in the wellbore to below the excitation temperature of the expanded particles;
uniformly mixing the sand-carrying liquid and the expanded particles to obtain an expanded particle solution; injecting the swelling particle solution into the wash pipe to perform packing to obtain a completion string filled with swelling particles according to any one of claims 5 to 7;
injecting high-temperature fluid into the washpipe, raising the temperature in the well bore to be higher than the excitation temperature of the expanded particles so as to enable the expanded particles to be in an original state, and closing the completion pipe string filled with the expanded particles for 5-24 hours;
and injecting normal-temperature fluid into the washing pipe, and reducing the temperature in the well bore to be lower than the excitation temperature of the expanded particles so that the expanded particles are in a glass state.
9. The method of claim 7, wherein the swelling particle solution is packed in an amount of 0.5 to 5.0m 3 Min; the volume ratio of the expanded particles to the sand-carrying fluid is 5-70%.
10. The method for preparing a completion string filled with expanded particles according to claim 7, wherein the sand-carrying fluid is KCl salt aqueous solution with the density of 1.05-1.20 g/cm 3 The temperature is 10-25 ℃.
11. The method of claim 7, wherein the high temperature fluid is at a temperature of 40 to 100 ℃.
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| CN202110545208.1A CN115370326A (en) | 2021-05-19 | 2021-05-19 | Expanded particles, completion pipe string filled with expanded particles and method for filling completion with expanded particles |
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