CN113122214A - Composite profile control agent system, injection method and application thereof - Google Patents
Composite profile control agent system, injection method and application thereof Download PDFInfo
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Abstract
The invention provides a composite profile control agent system, an injection method and application thereof. The composite profile control agent system comprises a first suspension system and a second suspension system, wherein the first suspension system comprises polymer elastic microspheres, the second suspension system comprises inorganic rigid particles, and the bulk modulus of the inorganic rigid particles is 6-12 GPa. Because the composite profile control agent system comprises a first suspension system with polymer elastic microspheres and a second suspension system with inorganic rigid particles, the composite profile control agent system has the advantages of two systems, namely, the elasticity and the rigidity are combined and mutually supplemented, the composite profile control agent system can be transported to the deep part of a stratum, the plugging strength is high, the plugging effect on an extra-high permeable layer and a large pore passage is good (the plugging rate is more than 97%), the scouring resistance is excellent (the plugging rate is reduced by no more than 5%), and the total effective period of profile control is long.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a composite profile control agent system, an injection method and application thereof.
Background
The conglomerate reservoir has serious reservoir heterogeneity caused by a near source, a multi-water system and a rapid and variable deposition environment, and the reservoir heterogeneity is aggravated due to the influence of hydrodynamic geological action in the long-term water injection process. Under this dual action, some dominant channels often develop in conglomerate reservoirs with pore throat diameters tens or even hundreds of times that of the hypotonic matrix, causing channeling and inefficient circulation of the injection fluid (water or polymer) from the injection well to the production well. For low permeability conglomerate reservoirs, the permeability of the matrix is low (at 10.0X 10)-3μm2Left and right) the injection fluid is more severely channeling along the water flooding dominant channel.
For the conglomerate oil reservoir stratum, because a gel and jelly type profile control agent system which is conventionally adopted is underground crosslinked, a plurality of gelling influence factors are easily caused, the gelling strength cannot be expected, even the profile control effect is not ideal when the gel and jelly type profile control agent system flows to a production well. In the prior art, most of inorganic particle profile control agents for conglomerate oil reservoirs are cement, fly ash and the like, have good temperature resistance and salt tolerance and are commonly used for plugging cracks, but the inorganic plugging agents have poor selectivity after entering a stratum and are difficult to enter the deep part of the stratum.
Therefore, there is a need to develop a conglomerate reservoir profile control agent system which can have excellent deep profile control effect.
Disclosure of Invention
The invention mainly aims to provide a composite profile control agent system, an injection method and application thereof, and aims to solve the problem that the profile control agent in the prior art is difficult to realize deep profile control on a conglomerate oil reservoir stratum.
In order to achieve the above object, according to one aspect of the present invention, a composite profile control agent system is provided, which includes a first suspension system and a second suspension system, wherein the first suspension system includes polymer elastic microspheres, the second suspension system includes inorganic rigid particles, and the inorganic rigid particles have a bulk modulus of 6-12 GPa.
Further, the weight ratio of the polymer elastic microspheres to the inorganic rigid particles is (1-4): 16.
furthermore, the particle size of the polymer elastic microspheres is 106-270 mu m.
Further, the polymer elastic microspheres are pre-crosslinked gel particles with a branched structure.
Further, the first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent and a solvent, preferably, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer, preferably, the content of the monomer composition in the first raw material is 0.4-1.5 wt%, and more preferably, the mass ratio of the acrylamide monomer to the acrylic acid monomer to the branched unsaturated monomer is (1-2): 4: (1-3), preferably, the initiator is ammonium persulfate and/or potassium persulfate, preferably, the content of the initiator in the first raw material is 0.4-0.5 wt%, preferably, the cross-linking agent is methylene bisacrylamide, preferably, the content of the cross-linking agent in the first raw material is 0.1-0.3 wt%, preferably, the composite profile control agent system further comprises polyethylene glycol diacrylate, and more preferably, the content of the polyethylene glycol diacrylate in the first raw material is 0.1-0.4 wt%.
Further, the particle size of the inorganic rigid particles is 10 to 40 μm.
Further, the inorganic rigid particles include a composite structure of glass fibers and inorganic particles.
Further, the components of the inorganic rigid particles comprise glass fibers and sodalime, and the length of the glass fibers is preferably 1.0-1.5 cm.
Further, the concentration of the polymer elastic microspheres in the composite profile control agent system is 1000-5000 mg/L, preferably 2000-2500 mg/L; or the injection concentration of the first suspension system is 1000-5000 mg/L, preferably 2000-2500 mg/L.
According to another aspect of the present invention, there is provided a method of injecting a composite profile control agent system, comprising the steps of: simultaneously injecting the first suspension system and the second suspension system in the composite profile control agent system into the stratum; or alternately injecting the first suspension system and the second suspension system in the composite profile control agent system into the stratum.
Further, the first suspension system and the second suspension system are injected into the stratum simultaneously, and the concentration of the polymer elastic microspheres in the composite profile control agent system is 1000-5000 mg/L, preferably 2000-2500 mg/L; or the first suspension system and the second suspension system are alternately injected into the stratum, and the injection concentration of the first suspension system is 1000-5000 mg/L, preferably 2000-2500 mg/L.
Further, the first suspension system and the second suspension system are injected into the stratum simultaneously, the second suspension system comprises glass fibers, sodium soil and a solvent, the content of the glass fibers in the composite profile control agent system is preferably 0.05-0.1 wt%, and the content of the sodium soil in the composite profile control agent system is preferably 2-8 wt%; or alternately injecting the first suspension system and the second suspension system into the stratum, wherein the second suspension system comprises glass fibers, sodium soil and a solvent, the content of the glass fibers in the second suspension system is preferably 0.05-0.1 wt%, and the content of the sodium soil in the second suspension system is preferably 2-8 wt%.
According to another aspect of the invention, there is also provided the use of a composite profile control agent system for the profile control of a conglomerate reservoir using the composite profile control agent system or the injection method described above.
The technical scheme of the invention is applied to provide a composite profile control agent system, and the composite profile control agent system comprises a first suspension system with polymer elastic microspheres and a second suspension system with inorganic rigid particles, wherein the volume modulus of the inorganic rigid particles meets the range and can enable the inorganic rigid particles to have higher rigidity, so that the composite profile control agent system can have the advantages of two systems, namely elasticity and rigidity are combined and supplemented with each other, the deep migration to the stratum can be realized, the plugging strength is high, the plugging effect on an ultrahigh permeable layer and a large pore path is good (the plugging rate is more than 97%), the scouring resistance is excellent (the plugging rate is reduced by no more than 5%), and the total effective period of profile control is long. Moreover, the composite profile control agent system is suitable for blocking a conglomerate oil reservoir channeling channel, has an obvious inhibiting effect on interlayer channeling, can effectively solve the problem of water logging of an oil well caused by the channeling of a dominant channel (water or polymer channeling) in a low-permeability conglomerate oil reservoir, and can increase the swept volume of injected fluid and improve the oil recovery ratio. Meanwhile, the construction process of the composite profile control agent system is simple, the on-site injection allocation is simple and feasible, and the method is not limited by the production area and the yield of raw materials.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram illustrating a conglomerate sand-packed model displacement device according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram illustrating an alternate injection device for a profile control agent of a conglomerate sand-packed model according to an embodiment of the present invention;
FIG. 3 is a graph showing the pressure profile of the polymer elastic microspheres of comparative example 1 according to the present invention as a function of the volume of pores injected alone;
FIG. 4 is a graph showing the pressure variation with the injection pore volume factor when the inorganic rigid particles are injected alone in comparative example 2 of the present invention;
FIG. 5 is a graph showing the pressure variation with the injection pore volume factor when the polymer elastic microspheres and the inorganic rigid particles are alternately injected in example 1 of the present invention;
FIG. 6 is a graph showing the pressure variation with the injection pore volume factor when the polymer elastic microspheres and the inorganic rigid particles are mixed and injected in example 2 of the present invention.
Wherein the figures include the following reference numerals:
1. a advection pump; 2. a first intermediate container; 3. a second intermediate container; 4. a precision pressure gauge; 5. conglomerate sand-filled model; 6. a measuring cylinder; 7. a third intermediate container.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, there is a need to develop a conglomerate reservoir profile control agent system that can have excellent deep profile control effect. The inventor of the invention researches the problems and provides a composite profile control agent system which comprises a first suspension system and a second suspension system, wherein the first suspension system comprises polymer elastic microspheres, the second suspension system comprises inorganic rigid particles, and the volume modulus of the inorganic rigid particles is 6-12 GPa.
Because the composite profile control agent system comprises a first suspension system with polymer elastic microspheres and a second suspension system with inorganic rigid particles, wherein the volume modulus of the inorganic rigid particles meets the range and can enable the inorganic rigid particles to have larger rigidity, the composite profile control agent system can have the advantages of two systems, namely elasticity and rigidity complement each other, can be transported to the deep part of a stratum, has high plugging strength, has good plugging effect on ultra-high permeable layers and large pore canals (the plugging rate is more than 97%), has excellent flushing resistance (the plugging rate is reduced by no more than 5%), and has long total profile control effective period.
Moreover, the composite profile control agent system is suitable for blocking a conglomerate oil reservoir channeling channel, has an obvious inhibiting effect on interlayer channeling, can effectively solve the problem of water logging of an oil well caused by the channeling of a dominant channel (water or polymer channeling) in a low-permeability conglomerate oil reservoir, and can increase the swept volume of injected fluid and improve the oil recovery ratio. Meanwhile, the construction process of the composite profile control agent system is simple, the on-site injection allocation is simple and feasible, and the method is not limited by the production area and the yield of raw materials.
In the composite profile control agent system, in order to better exert the advantages of the two systems and further improve the blocking capability and the flushing resistance of the composite profile control agent system, the weight ratio of the polymer elastic microspheres in the first suspension system to the inorganic rigid particles in the second suspension system is preferably 1 (4-16).
In order to enable the polymer elastic microspheres to smoothly enter the stratum and simultaneously have larger plugging strength, the particle size of the polymer elastic microspheres is preferably 106-270 mu m; also, preferably, the polymer elastic microspheres are pre-crosslinked gel particles having a branched structure, and the first raw material for forming the polymer elastic microspheres may include a monomer composition, an initiator, a crosslinking agent, and a solvent.
In order to enable the polymeric elastic microspheres to have greater elasticity and strength, preferably, the monomer composition includes an acrylamide monomer, an acrylic acid monomer, and a branched unsaturated monomer. Wherein the branched unsaturated monomer may be selected from any one or more of allyl propane, allyl butane and allyl cyclopentane.
In order to enable the polymer elastic microspheres to have larger elasticity and strength, the content of the monomer composition in the first raw material is preferably 0.4-1.5 wt%, and the mass ratio of the acrylamide monomer, the acrylic acid monomer and the branched unsaturated monomer is more preferably (1-2): 4 (1-3).
In order to enable the polymer elastic microspheres to have larger elasticity and strength, the initiator is preferably ammonium persulfate and/or potassium persulfate, and more preferably, the content of the initiator in the first raw material is 0.4-0.5 wt%.
In order to enable the polymer elastic microspheres to have larger elasticity and strength, the cross-linking agent is preferably methylene bisacrylamide, and more preferably, the content of the cross-linking agent in the first raw material is 0.1-0.3 wt%.
Preferably, the composite profile control agent system further comprises polyethylene glycol diacrylate, the components can control the expansion rate of the prepared elastic microspheres, and more preferably, the content of the polyethylene glycol diacrylate in the first raw material is 0.1-0.4 wt%.
In order to make the inorganic rigid particles smoothly enter the formation and have a large plugging strength, the particle size of the inorganic rigid particles is preferably 10 to 40 μm. Also, preferably, the inorganic rigid particles include a composite structure of glass fibers and inorganic particles; more preferably, the components of the inorganic rigid particles include glass fibers and sodalime, and further preferably, the length of the glass fibers is 1.0 to 1.5 cm.
In a preferred embodiment, the conglomerate reservoir is profile-controlled using the above-described composite profile control agent system of the present invention, and the injection mode of the composite profile control agent system may include simultaneous injection and alternate injection of the first suspension system and the second suspension system. In order to enable the composite profile control agent system to have higher plugging capability and flushing resistance, when the first suspension system and the second suspension system are injected simultaneously, the concentration of the polymer elastic microspheres in the composite profile control agent system is preferably 1000-5000 mg/L, and more preferably 2000-2500 mg/L; when the first suspension system and the second suspension system are injected alternately, the injection concentration of the first suspension system is 1000-5000 mg/L, and more preferably 2000-2500 mg/L.
According to another aspect of the present invention, there is provided a method of injecting a composite profile control agent system, comprising the steps of: simultaneously injecting the first suspension system and the second suspension system in the composite profile control agent system into the stratum; or alternately injecting the first suspension system and the second suspension system in the composite profile control agent system into the stratum.
The second suspension system can comprise glass fibers, sodium soil (the adopted sodium soil meets the natural gas standard SY5490-93 of the people's republic of China) and a solvent, and in order to enable the mixed profile control agent system to have higher plugging capability and scouring resistance, when the first suspension system and the second suspension system are injected into a stratum simultaneously, the content of the glass fibers in the composite profile control agent system is preferably 0.05-0.1 wt%, and the content of the sodium soil in the composite profile control agent system is 2-8 wt%; when the second suspension system comprises glass fibers, sodium soil and a solvent, the content of the glass fibers in the second suspension system is preferably 0.05 to 0.1 wt%, and the content of the sodium soil in the second suspension system is preferably 2 to 8 wt%.
According to another aspect of the invention, there is also provided the use of a composite profile control agent system for the profile control of a conglomerate reservoir using the composite profile control agent system or the injection method described above.
The above-described composite profile control agent system of the present invention will be further described with reference to examples and comparative examples.
Comparative example 1
In the comparative example, the polymer elastic microspheres in the composite profile control agent system are prepared to form a suspension, and the plugging capability and the scouring resistance of the independently adopted polymer elastic microspheres are evaluated by using the permeability plugging rate as an index through a flow experiment in a sand-packed model. Relate to different permeability sand filling models, according to actual conglomerate oil reservoir gravel constitution system of packing, specifically do: permeability 8459, 7206, 5984, 4753, 3361 (1X 10)-3μm2) The model, gravel composition for pack is in proper order: 20% fine + 30% medium + 50% coarse, 25% fine + 30% medium + 45% coarse, 30% fine + 30% medium + 40% coarse, 35% fine + 30% medium + 35% coarse, 40% fine + 30% medium + 30% coarse. Wherein the grain size of the coarse sand is 3-6 mm, the grain size of the medium sand is 0.4-0.9 mm, and the grain size of the fine sand is 0.15-0.2 mm.
The flow experiment device is shown in fig. 1 and comprises a constant flow pump 1, a first intermediate container 2, a second intermediate container 3, a precision pressure gauge 4, a conglomerate sand-filling model 5 and a measuring cylinder 6. The advection pump 1 is used for injecting experimental fluid; the intermediate containers 2 and 3 are used for storing water and a profile control agent respectively; the precision pressure gauge is used for detecting real-time pressure in the fluid injection process; the conglomerate sand-packed model 5 is a gravel-packed sand-packed model; the measuring cylinder 6 is used for collecting produced liquid. And pumping out the water stored in the intermediate container 2 by a constant flow pump, injecting the water into a sand filling model 5 by a precision pressure gauge 4, and testing the permeability of the model.
The first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent, polyethylene glycol diacrylate and a solvent, wherein the content of the monomer composition in the first raw material is 0.4 wt%, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer in a mass ratio of 2:4:1, the initiator is ammonium persulfate, the content of the initiator in the first raw material is 0.4 wt%, the cross-linking agent is methylene bisacrylamide, the content of the cross-linking agent in the first raw material is 0.2 wt%, and the content of the polyethylene glycol diacrylate in the first raw material is 0.3 wt%.
Preparing a polymer elastic microsphere suspension with the concentration of 5000mg/L and storing the suspension in an intermediate container 3; injecting an elastic ball system (0.3PV) in the intermediate container 3 into a sand filling model 5 through a precision pressure gauge 4 at a speed of 1ml/min by using a constant-flow pump 1, and recording pressure data of the precision pressure gauge 4 in real time; after the completion of the injection of the elastic ball, water (15PV) was again injected at a rate of 1ml/min, the injection pressure was recorded, and the model permeability was calculated, with the test results shown in Table 1.
TABLE 1
Fig. 3 and table 1 respectively show the pressure data before and after the injection of the polymer elastic microspheres, and the model permeability and the permeability plugging rate calculated according to the pressure data. The injection pressure of the conglomerate rock cores with different permeabilities is found to be increased sharply and then tends to be stable after the polymer elastic microspheres are injected, and the system is proved to form certain plugging on the rock cores; when the water is filled to 15PV later, the injection pressure is gradually reduced firstly, and then the descending trend is reduced (as shown in figure 3), but the total pressure is obviously higher than the initial water injection pressure, which shows that the plugging formed by the polymer elastic microspheres is resistant to water scouring. The permeability data (shown in Table 1) further demonstrate that the polymeric elastic microspheres can have a wide permeability range of 3361-8459 (1 × 10)-3μm2) The conglomerate dominant channel forms certain plugging, the permeability of the channel is reduced, the plugging rate after subsequent water injection 15PV flushing can still be kept above 71.7 percent, and certain flushing resistance is shown.
Comparative example 2
In the comparative example, inorganic rigid particles in the composite profile control agent system are prepared to form a suspension, and the plugging capability and the scouring resistance of the inorganic rigid particles which are independently adopted are evaluated by using the permeability plugging rate as an index through a flow experiment in a sand-packed model. Relate to different permeability sand filling models, according to actual conglomerate oil reservoir gravel constitution system of packing, specifically do: permeability of 8532, 6363, 5047, 4892, 3634(1 × 10)-3μm2) Model, gravel composition for packing was the same as in comparative example 1。
Similarly, a flow experiment device shown in fig. 1 is adopted, the experiment procedure in comparative example 1 is adopted, wherein an inorganic rigid particle suspension is prepared, the components of the inorganic rigid particles comprise glass fibers and sodium soil, the length of the glass fibers is 1.2cm, the mass percentage concentration of the glass fibers in the suspension is 0.1%, the mass percentage concentration of the sodium soil is 5%, the bulk modulus of the inorganic rigid particles meets 6-12 GPa, and the test results are shown in table 2.
TABLE 2
Fig. 4 and table 2 respectively show pressure data before and after the injection of the inorganic rigid particles, and model permeability and permeability plugging rate calculated according to the pressure. The injection pressure of the artificial conglomerate rock core with different particle sizes is suddenly increased and tends to be stable after the inorganic rigid particles are injected, which shows that the system forms a certain block on the rock core; when the water is filled to 15PV later, the injection pressure is gradually reduced, the descending trend is reduced, but the total pressure is obviously higher than the initial water injection pressure (as shown in figure 4), and the plugging formed by the inorganic rigid particles is resistant to water scouring. The permeability data (as shown in Table 2) further demonstrate that the inorganic rigid particles can have a wide permeability range of 3634-8532 (1 × 10)-3μm2) The conglomerate dominant channel forms a certain plug, the permeability of the channel is reduced, the plug rate after subsequent water injection 15PV scouring is almost unchanged, the scouring resistance of the inorganic rigid particles is high, but the plug rate is slightly reduced compared with a high-strength elastic ball, the particle size of the inorganic rigid particles is fixed in analysis, and the elastic ball can enter the deep part of a stratum through a finer pore throat through deformation and stretching, so that the plug rate is higher.
Example 1
In this embodiment, the composite profile control agent system of the present invention is adopted, and a flow experiment in a sand-packed model is performed, and a plugging capability and a washability resistance of the polymer elastic microspheres and the inorganic rigid particles when alternately injected are evaluated by using a permeability plugging rate as an index. Relates to sand filling moulds with different permeabilityType, according to actual conglomerate oil reservoir gravel constitution system of filling, it is specific: the permeability is 8537, 7289, 5963, 4782, 3691(1 × 10)-3μm2) The model, gravel pack composition was the same as in comparative example 1. The flow experimental device is shown in fig. 2 and comprises a constant flow pump 1, a first intermediate container 2, a second intermediate container 3, a third intermediate container 7, a precision pressure gauge 4, a conglomerate sand-filling model 5 and a measuring cylinder 6, namely, the third intermediate container 7 is added on the basis of the flow experimental device shown in fig. 1 and is also used for storing water and a profile control agent, and other experimental device components have the same functions as those of the comparative examples 1-2. In the experiment, firstly, a water pump stored in an intermediate container 2 is injected into a sand filling model 5 through a precision pressure gauge 4 at a displacement speed of 1ml/min by a constant flow pump 1, and the model permeability is tested.
Respectively preparing an inorganic rigid particle suspension and a polymer elastic microsphere suspension, wherein the inorganic rigid particle suspension comprises glass fibers and sodium soil, the length of the glass fibers is 1.2cm, the mass percentage concentration of the glass fibers in the inorganic rigid particle suspension is 0.1%, the mass percentage concentration of the sodium soil is 5%, the bulk modulus of the inorganic rigid particles meets 6-12 GPa, and the prepared inorganic rigid particle suspension is stored in an intermediate container 7; continuously preparing the polymer elastic microsphere suspension, wherein the first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator and a cross-linking agent, the polymer elastic microsphere suspension comprises polyethylene glycol diacrylate and a solvent, wherein the content of a monomer composition in a first raw material is 0.6 wt%, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and allyl propane in a mass ratio of 1:2:1, an initiator is ammonium persulfate, the content of the initiator in the first raw material is 0.4 wt%, a cross-linking agent is methylene bisacrylamide, the content of the cross-linking agent in the first raw material is 0.2 wt%, the content of the polyethylene glycol diacrylate in the first raw material is 0.2 wt%, the concentration of polymer elastic microspheres in the polymer elastic microsphere suspension is 5000mg/L, the particle size is 106-270 mu m, and the prepared polymer elastic microsphere suspension with the concentration of 5000mg/L is stored in an intermediate container 3;
alternately injecting the profile control agent in the middle container 3 and the profile control agent in the middle container 7 at the speed of 1ml/min (0.05 PV for each time, repeating for three times) by using a constant flow pump 1, injecting the profile control agent into a sand filling model 5 by using a precision pressure gauge 4, and recording the pressure data of the precision pressure gauge 4 in real time; after the composite system of the high-strength elastic ball and the reinforced inorganic rigid particles is injected alternately, water (15PV) is injected again at the speed of 1ml/min, the injection pressure is recorded, the model permeability is calculated, and the test results are shown in Table 3.
TABLE 3
Fig. 5 and table 3 respectively show the pressures before and after the polymer elastic microspheres and the inorganic rigid particles are alternately injected, and the model permeability and the permeability plugging rate calculated according to the pressures. The pressure is rapidly increased after the conglomerate core systems with different permeability rates are alternately injected, and exceeds the highest injection pressure when the conglomerate core systems with different permeability rates are separately injected, so that the synergistic effect exists between the polymer elastic microspheres and the inorganic rigid particles, and the plugging capability of the profile control agent is enhanced by the combined use of the polymer elastic microspheres and the inorganic rigid particles. When the pressure of the injection water is increased to 15PV, the injection pressure is slightly decreased, but the decrease is not large as a whole, which indicates that the plugging flushing resistance of the system is good (see FIG. 5). The permeability data (as shown in Table 3) further demonstrate that the profile control agent can achieve a wider permeability range 3634-8532 (1 × 10) when injected alternately-3μm2) The conglomerate dominant channel forms good plugging, the model permeability plugging rate reaches more than 97.3 percent, the plugging rate after subsequent 15PV flushing by water injection can still be kept at more than 96.6 percent, and the excellent flushing resistance is shown. The comparison shows that the plugging capability of the polymer elastic microspheres and the inorganic rigid particles injected alternately is stronger than that of the polymer elastic microspheres and the inorganic rigid particles injected separately.
Example 2
In this example, the composite profile control agent system of the present invention is used to evaluate the plugging capability and the scouring resistance of the composite system of the polymer elastic microspheres and the inorganic rigid particles when the composite system is mixed and injected by a flow experiment in a sand-packed model with the permeability plugging rate as an index. Relate to different permeability sand filling models, according to actual conglomerate oil reservoir gravel composition system of packing, it is specific: permeability of 9051, 7475, 5638, 4728, 3423(1 × 10)-3μm2) The model, gravel pack composition was the same as in comparative example 1. Similarly, a flow experiment device shown in fig. 1 is adopted, in the experiment, firstly, the water stored in the intermediate container 2 is pumped out by the advection pump 1 at the displacement speed of 1ml/min, and is injected into the sand-packed model 5 through the precision pressure gauge 4, and the model permeability is tested.
Preparing mixed suspension of inorganic rigid particles and polymer elastic microspheres, wherein the components of the inorganic rigid particles comprise glass fibers and sodalite, the length of the glass fibers is 1.2cm, the mass percentage concentration of the glass fibers in the mixed suspension is 0.1%, the mass percentage concentration of the sodalite is 5%, the polymer elastic microspheres same as those in the embodiment 1 are adopted, the concentration of the polymer elastic microspheres in the mixed suspension is 5000mg/L, and the particle size is 106-270 mu m.
Storing the prepared mixed suspension in an intermediate container 3; pumping out (0.3PV) the profile control agent in the intermediate container 3 at the speed of 1ml/min by using a constant flow pump 1, injecting the profile control agent into a sand filling model 5 through a precision pressure gauge 4, and recording the pressure data of the precision pressure gauge 4 in real time; after the injection of the composite system of the polymer elastic microspheres and the inorganic rigid particles is finished, water (15PV) is injected again at the speed of 1ml/min, the injection pressure is recorded, the model permeability is calculated, and the test results are shown in Table 4.
TABLE 4
Fig. 6 and table 4 respectively show pressures before and after the mixing injection of the polymer elastic microspheres and the inorganic rigid particles, and the model permeability and the permeability plugging rate calculated from the pressures. When the conglomerate cores with different permeabilities are found, after the two profile control agents are mixed and injected, the pressure is increased rapidly and exceeds the highest injection pressure when the two systems are respectively and independently injected, so that the synergistic effect exists between the polymer elastic microspheres and the inorganic particles, and the plugging capability of the profile control agent is enhanced by the combined use of the polymer elastic microspheres and the inorganic particles. When the pressure of the injection water is increased to 15PV, the injection pressure is slightly decreased, but the decrease is not large as a whole, which indicates that the plugging flushing resistance of the system is good (see FIG. 6). Permeability data (see table 4) furtherProves that the profile control agent can have a wide permeability range of 3423-9051 (1 x 10) during mixed injection-3μm2) The conglomerate dominant channel forms good plugging, the model permeability plugging rate reaches more than 97.5 percent, the plugging rate after subsequent 15PV flushing by water injection can still be kept at more than 96.6 percent, and the excellent flushing resistance is shown. The comparison shows that the plugging capability of the polymer elastic microspheres and the inorganic rigid particles injected in a mixed manner is stronger than that of the polymer elastic microspheres and the inorganic rigid particles injected separately.
Example 3
The difference between the composite profile control agent system used in this example and example 2 is that: the weight ratio of the polymer elastic microspheres to the inorganic rigid particles is 1: 4.
example 4
The difference between the composite profile control agent system used in this example and example 2 is that: the weight ratio of the polymer elastic microspheres to the inorganic rigid particles is 1: 10.
example 5
The difference between the composite profile control agent system used in this example and example 2 is that:
the first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent, polyethylene glycol diacrylate and a solvent, wherein the content of the monomer composition in the first raw material is 0.4 wt%, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer in a mass ratio of 1:4:1, the initiator is ammonium persulfate, the content of the initiator in the first raw material is 0.4 wt%, the cross-linking agent is methylene bisacrylamide, the content of the cross-linking agent in the first raw material is 0.1 wt%, and the content of the polyethylene glycol diacrylate in the first raw material is 0.1 wt%.
Example 6
The difference between the composite profile control agent system used in this example and example 2 is that:
the first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent, polyethylene glycol diacrylate and a solvent, wherein the content of the monomer composition in the first raw material is 1.5 wt%, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer in a mass ratio of 2:4:3, the initiator is ammonium persulfate, the content of the initiator in the first raw material is 0.5 wt%, the cross-linking agent is methylene bisacrylamide, the content of the cross-linking agent in the first raw material is 0.3 wt%, and the content of the polyethylene glycol diacrylate in the first raw material is 0.4 wt%.
Example 7
The difference between the composite profile control agent system used in this example and example 2 is that:
the first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent, polyethylene glycol diacrylate and a solvent, wherein the content of the monomer composition in the first raw material is 0.2 wt%, the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer in a mass ratio of 1:2:1, the initiator is ammonium persulfate, the content of the initiator in the first raw material is 0.2 wt%, the cross-linking agent is methylene bisacrylamide, the content of the cross-linking agent in the first raw material is 0.05 wt%, and the content of the polyethylene glycol diacrylate in the first raw material is 0.05 wt%.
Example 8
The difference between the composite profile control agent system used in this example and example 2 is that:
the length of the glass fiber is 1.0cm, the content of the glass fiber in the composite profile control agent system is 0.05 wt%, and the content of the sodium soil is 2 wt%.
Example 9
The difference between the composite profile control agent system used in this example and example 2 is that:
the length of the glass fiber is 1.5cm, the content of the glass fiber in the composite profile control agent system is 0.1 wt%, and the content of the sodium soil is 8 wt%.
Example 10
The difference between the composite profile control agent system used in this example and example 2 is that:
the length of the glass fiber is 0.6cm, the content of the glass fiber in the composite profile control agent system is 0.02 wt%, and the content of the sodium soil is 1 wt%.
Example 11
The difference between the composite profile control agent system used in this example and example 2 is that:
the concentration of the polymeric elastic microspheres in the composite profile control agent system (i.e., the mixed suspension) was 1000 mg/L.
Example 12
The difference between the composite profile control agent system used in this example and example 2 is that:
the concentration of the polymeric elastic microspheres in the composite profile control agent system (i.e., the mixed suspension) was 2500 mg/L.
Example 13
The difference between the composite profile control agent system used in this example and example 2 is that:
the concentration of the polymeric elastic microspheres in the composite profile control agent system (i.e., the mixed suspension) was 500 mg/L.
Example 14
The difference between the composite profile control agent system used in this example and example 1 is that:
the concentration of the polymeric elastic microspheres in the polymeric elastic microsphere suspension was 1000 mg/L.
Example 15
The difference between the composite profile control agent system used in this example and example 1 is that:
the concentration of the polymeric elastic microspheres in the polymeric elastic microsphere suspension was 2500 mg/L.
Example 16
The difference between the composite profile control agent system used in this example and example 1 is that:
the concentration of the polymeric elastic microspheres in the polymeric elastic microsphere suspension was 500 mg/L.
The plugging ability and the erosion resistance of the composite system of the polymer elastic microspheres and the inorganic rigid particles in the above examples 3-13 were evaluated by a flow test in a sand-packed model with the permeability plugging rate as an index, wherein the numbers 4-3# are used in the examples 3-13, and the permeability is 5638(1 × 10)-3μm2) Modeling, and evaluating the plugging capability and the scouring resistance of the polymer elastic microspheres and the inorganic rigid particles in the above examples 14-16, wherein the numbers 3-3# are adopted in the examples 14-16, and the permeability is 5963(1 × 10)-3μm2) Model, test results are shown in Table 5Shown in the figure.
TABLE 5
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the polymer elastic microspheres in the composite profile control agent system have the characteristics of high strength and strong deformability, are matched with the pore throat size of a conglomerate oil reservoir stratum, can realize multi-slug treatment and simple injection, directly take water as a carrying medium, are synthesized, crushed and screened on the ground in advance, can manually control the granularity and the strength, and effectively avoid the problems of insufficient crosslinking gelling strength or insufficient underground reaction under the ground;
2. the inorganic rigid particles in the composite profile control agent system have higher strength compared with other profile control agents, can block an extra-high permeable stratum to a certain degree, are cheap and easily available in materials, have stable chemical properties and high strength, and are ideal profile control agents for blocking large pore channels of conglomerate oil reservoirs;
3. the composite particle profile control agent has elasticity and rigidity and is mutually supplemented, so that the profile control agent can be transported to the deep part of a stratum, has high plugging strength, has a good plugging effect on an ultra-high permeable layer and a large pore channel (the plugging rate is more than 97%), has excellent flushing resistance (the plugging rate is reduced by no more than 5%), and has long total profile control validity period;
4. the composite profile control agent system is suitable for blocking a conglomerate oil reservoir channeling channel, has an obvious inhibiting effect on interlayer channeling, can effectively solve the problem of water logging of an oil well caused by the channeling of a dominant channel (water or polymer channeling) in a low-permeability conglomerate oil reservoir, and can increase the swept volume of injected fluid and improve the oil recovery ratio. Meanwhile, the construction process of the composite profile control agent system is simple, and the on-site injection allocation is simple and feasible.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A composite profile control agent system is characterized by comprising a first suspension system and a second suspension system, wherein the first suspension system comprises polymer elastic microspheres, the second suspension system comprises inorganic rigid particles, and the volume modulus of the inorganic rigid particles is 6-12 GPa.
2. The composite profile control agent system according to claim 1, wherein the weight ratio of the polymeric elastic microspheres to the inorganic rigid particles is (1-4): 16.
3. the composite profile control agent system of claim 1 or 2, wherein the particle size of the polymer elastic microspheres is 106-270 μm.
4. The composite profile control agent system according to claim 1 or 2, wherein the polymeric elastic microspheres are pre-crosslinked gel particles with a branched structure.
5. The composite profile control agent system according to claim 4, wherein a first raw material for forming the polymer elastic microspheres comprises a monomer composition, an initiator, a cross-linking agent and a solvent, preferably the monomer composition comprises an acrylamide monomer, an acrylic acid monomer and a branched unsaturated monomer, preferably the monomer composition in the first raw material is 0.4-1.5 wt%, more preferably the mass ratio of the acrylamide monomer, the acrylic acid monomer and the branched unsaturated monomer is (1-2): 4 (1-3), preferably the initiator is ammonium persulfate and/or potassium persulfate, preferably the initiator in the first raw material is 0.4-0.5 wt%, preferably the cross-linking agent is methylene bisacrylamide, preferably the cross-linking agent in the first raw material is 0.1-0.3 wt%, preferably the composite profile control agent system further comprises polyethylene glycol diacrylate, more preferably, the content of the polyethylene glycol diacrylate in the first raw material is 0.1 to 0.4 wt%.
6. The composite profile control agent system according to claim 1 or 2, wherein the particle size of the inorganic rigid particles is 10 to 40 μm.
7. The composite profile control agent system according to claim 1 or 2, wherein the inorganic rigid particles comprise a composite structure of glass fibers and inorganic particles.
8. The composite profile control agent system according to claim 7, wherein the components of the inorganic rigid particles comprise glass fibers and sodalime, preferably the glass fibers have a length of 1.0-1.5 cm.
9. The composite profile control agent system according to claim 1 or 2,
the concentration of the polymer elastic microspheres in the composite profile control agent system is 1000-5000 mg/L, preferably 2000-2500 mg/L; or
The injection concentration of the first suspension system is 1000-5000 mg/L, preferably 2000-2500 mg/L.
10. The injection method of the composite profile control agent system is characterized by comprising the following steps:
simultaneously injecting the first suspension system and the second suspension system of the composite profile control agent system of any one of claims 1 to 9 into the subterranean formation; or
Alternately injecting the first suspension system and the second suspension system of the composite profile control agent system of any one of claims 1 to 9 into the subterranean formation.
11. The implantation method according to claim 10,
the first suspension system and the second suspension system are injected into the stratum simultaneously, and the concentration of the polymer elastic microspheres in the composite profile control agent system is 1000-5000 mg/L, preferably 2000-2500 mg/L; or
The first suspension system and the second suspension system are alternately injected into the stratum, and the injection concentration of the first suspension system is 1000-5000 mg/L, preferably 2000-2500 mg/L.
12. The implantation method according to claim 10,
the first suspension system and the second suspension system are injected into the stratum simultaneously, the second suspension system comprises glass fibers, sodium soil and a solvent, the content of the glass fibers in the composite profile control agent system is preferably 0.05-0.1 wt%, and the content of the sodium soil in the composite profile control agent system is preferably 2-8 wt%; or
The first suspension system and the second suspension system are alternately injected into the stratum, the second suspension system comprises glass fibers, sodium soil and a solvent, the content of the glass fibers in the second suspension system is preferably 0.05-0.1 wt%, and the content of the sodium soil in the second suspension system is preferably 2-8 wt%.
13. Use of a composite profile control agent system according to any of claims 1 to 9 or an injection method according to any of claims 10 to 12 for profile control of a conglomerate reservoir.
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| CN105504158A (en) * | 2016-02-24 | 2016-04-20 | 白宝君 | Intelligent gel particles capable of being crosslinked again under stratum condition and preparation method and application of intelligent gel particles |
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| US20070056730A1 (en) * | 2003-05-13 | 2007-03-15 | Roger Keese | Well treating method to prevent or cure lost-circulation |
| CN102504795A (en) * | 2011-11-16 | 2012-06-20 | 中国石油天然气股份有限公司 | Dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion |
| CN104514531A (en) * | 2013-09-27 | 2015-04-15 | 中国石油天然气股份有限公司 | Method for profile control and water shutoff in two-fluid process for three-low sandstone reservoir |
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Application publication date: 20210716 |