CN112226219B - Jelly type foam system flow regulating agent and preparation method and application thereof - Google Patents
Jelly type foam system flow regulating agent and preparation method and application thereof Download PDFInfo
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- CN112226219B CN112226219B CN202011246786.7A CN202011246786A CN112226219B CN 112226219 B CN112226219 B CN 112226219B CN 202011246786 A CN202011246786 A CN 202011246786A CN 112226219 B CN112226219 B CN 112226219B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/493—Additives for reducing or preventing gas migration
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- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention relates to the field of oilfield chemistry, and discloses a gel type foam system flow regulating agent, and a preparation method and application thereof. In the invention, the raw materials for preparing the jelly type foam system flow regulator comprise 0.3-0.6 wt% of sodium alginate, 0.1-0.2 wt% of foaming agent, 0.02-0.05 wt% of calcium salt, 6-12 wt% of monomer, 0.4-0.8 wt% of cross-linking agent, 0.01-0.05 wt% of initiator A, 0.1-1 wt% of initiator B, 0.05-0.1 wt% of foam stabilizer and the balance of water. The gel type foam system flow regulating agent is suitable for blocking a gas channeling channel of a high-temperature and high-salinity oil reservoir, has good mechanical strength and structural strength, has good shear resistance, and can effectively resist the dilution effect of formation water on the system; the highest temperature resistance is 130 ℃, and the highest salinity resistance is 22 ten thousand of salinity.
Description
Technical Field
The invention relates to the field of oilfield chemistry, in particular to a gel type foam system flow regulating agent and a preparation method and application thereof.
Background
With the continuous deep development of oil fields, the continuous reduction of stratum energy leads to the reduction of oil production capacity of oil wells, and the gas injection oil displacement technology becomes an important way for improving the oil recovery rate after chemical oil displacement technologies such as a water displacement technology, a polymer oil displacement technology and the like. However, due to the heterogeneity of the oil reservoir, the oil reservoir is unevenly used between reservoir layers and in the reservoir layers, and with the increase of the gas injection scale, a serious gas cone phenomenon occurs, so that the gas drive efficiency is low, and therefore, it becomes very important to effectively block a gas channeling channel and improve the gas drive effect.
The existing plugging agent is difficult to consider both low density and high temperature and high salt, and is not ideal in the fluidity adjusting effect of a gas channeling channel. The foam plugging agent is widely applied due to the characteristics of high viscosity, selective plugging, effective increase of stratum flow resistance, small damage to the stratum and the like. However, in the high-temperature and high-salt environment of the stratum, the stability of the foam is sharply reduced, and the stable flow regulating capability is difficult to maintain for a long time.
The Chinese invention patent CN 108219761 provides a high temperature resistant biopolymer foam gel plugging agent with low density and little damage to a reservoir, wherein xanthan gum in a liquid phase component is a high molecular chain polysaccharide polymer generated by the action of xanthogen bacillus on carbohydrate, and the xanthan gum has more branched chains in a molecular structure, has rich hydroxyl groups and has no pollution to a stratum.
The Chinese invention patent CN 108203579 provides a nitrogen foam gel plugging agent, wherein the foam stabilizer carboxymethylcellulose sodium and soluble starch can stabilize the size of bubbles, reduce the liquid discharge speed of a liquid film, and also play a role in enhancing the film strength of foam.
Disclosure of Invention
The invention aims to overcome the problem of poor temperature resistance and salt tolerance stability of a foam type plugging agent in the prior art, and provides a gel type foam system flow regulating agent, and a preparation method and application thereof. The gel type foam system flow regulating agent is suitable for plugging a gas channeling passage of a high-temperature and high-salt oil reservoir, and has the characteristics of short gelling time, high gelling strength, resistance to dilution by formation water and long-term stability under a high-temperature and high-salt environment.
In order to achieve the above object, in one aspect, the present invention provides a jelly type foam system flow regulator, which is prepared from raw materials including 0.3-0.6 wt% of sodium alginate, 0.1-0.2 wt% of a foaming agent, 0.02-0.05 wt% of a calcium salt, 6-12 wt% of a monomer, 0.4-0.8 wt% of a cross-linking agent, 0.01-0.05 wt% of an initiator a, 0.1-1 wt% of an initiator B, 0.05-0.1 wt% of a foam stabilizer, and the balance of water.
Preferably, the raw materials for preparing the jelly type foam system flow regulator comprise 0.4-0.5 wt% of sodium alginate, 0.14-0.16 wt% of foaming agent, 0.03-0.04 wt% of calcium salt, 9-12 wt% of monomer, 0.6-0.8 wt% of cross-linking agent, 0.03-0.05 wt% of initiator A, 0.5-1 wt% of initiator B, 0.06-0.09 wt% of foam stabilizer and the balance of water.
Preferably, the frother is tetradecyl hydroxysultaine; the calcium salt is CaCl 2 。
Preferably, the monomer is an acrylamide monomer, the crosslinking agent is N-N methylene bisacrylamide, the initiator A is tert-butyl hydroperoxide, the initiator B is ammonium persulfate, and the foam stabilizer is a high-molecular foam stabilizer;
preferably, the high molecular foam stabilizer is anionic polyacrylamide;
preferably, the anionic polyacrylamide has a molecular weight of 1800 ten thousand.
The second aspect of the present invention provides a preparation method of the above jelly type foam system flow regulator, the method comprising the following steps:
(1) Weighing the raw materials according to the proportion;
(2) Mixing sodium alginate, a foaming agent, a part of monomers, a part of cross-linking agents, a part of initiators A, a part of initiators B, a foam stabilizer and a part of water uniformly to obtain a polymer base solution;
(3) Uniformly mixing the calcium salt, the residual monomers, the residual cross-linking agent, the residual initiator A, the residual initiator B and the residual water to obtain a salt ion base solution;
(4) Placing the polymer base liquid obtained in the step (2) into a stirrer to be stirred until a uniform and compact foam system is formed;
(5) Injecting the foam system obtained in the step (4) into the salt ion base liquid obtained in the step (3) from the bottom in a ratio of the volume of the bubbles to the volume of the salt solution of (2-6) to 1, and fully mixing to obtain a solidified foam system;
(6) And (5) gelling the solidified foam system obtained in the step (5) to obtain the gel type foam system flow regulating agent.
Preferably, in step (2), the mixing time is 6-8h.
Preferably, in step (3), the mixing time is 1-2h.
Preferably, in step (4), the stirring conditions include: the rotation speed is 4000-5000r/min, and the time is 4-6min.
Preferably, in step (6), the temperature for forming the gel is 100-130 ℃.
The third aspect of the invention provides an application of the gel type foam system flow regulating agent in oil reservoir plugging gas channeling passages.
The gel type foam system flow regulating agent is suitable for blocking a gas channeling channel in a high-temperature and high-salt oil reservoir, and sodium alginate is utilized to meet Ca 2+ The hydrogel curing characteristic is quickly formed, and the formed cured foam system has good mechanical strength and structural strength, good shear resistance and can effectively resist the dilution effect of formation water on the system; the highest temperature resistance is 130 ℃, and the highest salinity resistance is 22 ten thousand of salinity.
Drawings
FIG. 1 is a photograph of the foam system of example 1 after curing by injection into a salt ion-based liquid;
FIG. 2 is a photograph of a gel type foam system conditioner prepared in example 1 cured for 4 hours at 130 ℃ under a formation condition of 22 ten thousand mineralization;
FIG. 3 is a photograph of a gel type foam system conditioner prepared in example 1 cured for 24 hours at 130 ℃ under a formation condition of 22 ten thousand mineralization;
FIG. 4 is a photograph of a gel type foam system conditioner prepared in example 1 cured for 48 hours at 130 ℃ under a formation condition of 22 ten thousand mineralization.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In order to achieve the above object, one aspect of the present invention provides a jelly type foam system flow regulator, which is prepared from raw materials including 0.3-0.6 wt% of sodium alginate, 0.1-0.2 wt% of a foaming agent, 0.02-0.05 wt% of a calcium salt, 6-12 wt% of a monomer, 0.4-0.8 wt% of a cross-linking agent, 0.01-0.05 wt% of an initiator a, 0.1-1 wt% of an initiator B, 0.05-0.1 wt% of a foam stabilizer, and the balance of water.
In a preferred embodiment, the raw materials for preparing the jelly type foam system flow regulator comprise 0.4-0.5 wt% of sodium alginate, 0.14-0.16 wt% of foaming agent, 0.03-0.04 wt% of calcium salt, 9-12 wt% of monomer, 0.6-0.8 wt% of cross-linking agent, 0.03-0.05 wt% of initiator A, 0.5-1 wt% of initiator B, 0.06-0.09 wt% of foam stabilizer and the balance of water.
In a preferred embodiment, the frother is tetradecyl hydroxysultaine.
In a preferred embodiment, the calcium salt is CaCl 2 。
In a preferred embodiment, the monomer is Acrylamide Monomer (AM), the crosslinking agent is N-N Methylene Bisacrylamide (MBA), the initiator a is tert-butyl hydroperoxide (SA), the initiator B is ammonium persulfate, and the foam stabilizer is a polymer-based foam stabilizer;
further preferably, the polymeric foam stabilizer is anionic polyacrylamide (HPAM).
Still more preferably, the anionic polyacrylamide has a molecular weight of 1800 ten thousand.
In the invention, two initiators are used to accelerate the reaction rate, and anionic polyacrylamide is used as a foam stabilizer, so that the foam stabilizer can play a role in stabilizing foam before crosslinking and can participate in crosslinking to form jelly glue.
The second aspect of the present invention provides a method for preparing the above-mentioned gel type foam system flow regulator, said method comprising the following steps:
(1) Weighing the raw materials according to the proportion;
(2) Mixing sodium alginate, a foaming agent, a part of monomers, a part of cross-linking agent, a part of initiator A, a part of initiator B, a foam stabilizer and a part of water uniformly to obtain a polymer base solution;
(3) Uniformly mixing the calcium salt, the residual monomers, the residual cross-linking agent, the residual initiator A, the residual initiator B and the residual water to obtain a salt ion base solution;
(4) Placing the polymer base fluid obtained in the step (2) into a stirrer to be stirred until a uniform and compact foam system is formed;
(5) Injecting the foam system obtained in the step (4) into the salt ion base liquid obtained in the step (3) from the bottom in a ratio of the volume of the bubbles to the volume of the salt solution of (2-6) to 1, and fully mixing to obtain a solidified foam system;
(6) And (5) gelling the solidified foam system obtained in the step (5) to obtain the gel type foam system flow regulating agent.
In a preferred embodiment, in step (2), the weight of the partial monomer is 50% of the total weight of the monomers in the raw material, the weight of the partial initiator a is 50% of the total weight of the initiators in the raw material, the weight of the partial initiator B is 50% of the total weight of the initiators in the raw material, and the weight of the partial cross-linking agent is 50% of the total weight of the cross-linking agent in the raw material.
In the method of the present invention, there is no particular requirement for the mixing time in step (2) as long as it can be mixed uniformly. In a preferred embodiment, in step (2), the mixing time is 6 to 8 hours. Specifically, the mixing time may be 6h, 6.5h, 7h, 7.5h, or 8h.
In the method of the present invention, there is no particular requirement for the mixing time in step (3) as long as it can be mixed uniformly. In a preferred embodiment, in step (3), the mixing time is 1-2h. Specifically, the mixing time may be 1h, 1.2h, 1.5h, 1.75h, or 2h.
In a preferred embodiment, in step (4), the stirring conditions include: the rotation speed is 4000-5000r/min, and the time is 4-6min. Specifically, the stirring speed can be 4000r/min, 4100r/min, 4200r/min, 4300r/min, 4400r/min, 4500r/min, 4600r/min, 4700r/min, 4800r/min, 4900r/min or 5000r/min; the stirring time may be 4min, 4.5min, 5min, 5.5min or 6min.
In the method of the present invention, in step (6), there is no special requirement for the gelling conditions, and the conditions can be selected conventionally in the art. In a preferred embodiment, in order to achieve better gelling effect and meet the use conditions of high-temperature and high-salt formation, the gelling temperature is 100-130 ℃. Most preferably 130 deg.c.
In the method, in the step (6), the gelling time is influenced by the ratio of the raw materials and the gelling temperature, and the gelling time can be controlled by adjusting the ratio of the raw materials and the gelling temperature. In a preferred embodiment, the gel forming time is 175min to 270min.
In the invention, the prepared gel type foam system flow regulating agent has the density of 0.6-0.9 g/cm according to the gas-liquid ratio 3 The range is controllable.
The third aspect of the invention provides an application of the gel type foam system flow regulating agent in oil reservoir plugging gas channeling passages.
The gel type foam system flow regulating agent is suitable for blocking a gas channeling channel of a high-temperature and high-salt oil reservoir, can resist the temperature of 130 ℃ at most and resist the salinity of 22 ten thousand at most, and sodium alginate meets Ca 2+ The hydrogel curing characteristic is rapidly formed, and the formed cured foam system has good mechanical strength and structural strength,has good shear resistance, and can effectively resist the dilution effect of formation water on a system.
When the gel is applied, the solidified foam system obtained in the step (1-5) can be injected into a high-temperature high-salt stratum, the foam system can be kept stable for 4-5 h at the temperature of 130 ℃ by virtue of the structural strength after the solidified foam system is injected into the stratum, meanwhile, the stratum temperature is utilized to promote the system to be rapidly gelled, the half-life period of the obtained flow regulator after gelling reaches more than 48h, and the purpose of long-term high-temperature resistance can be achieved. In addition, the sodium alginate polymer in the flow regulator can form hydrogel with divalent cations in the stratum, and the high-salinity stratum water can make the flow regulator more stable, so that the purpose of high salinity resistance is achieved.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
Weighing raw materials according to a ratio, adding 0.6g of sodium alginate, 0.3g of THSB, 6g of AM, 0.4g of MBA, 0.01gSA, 0.1g of ammonium persulfate and 0.1g1800 ten thousand HPAM into 92.49g of water, and stirring for 8 hours to form a polymer base solution; adding 0.04g of CaCl 2 6gAM, 0.4g MBA, 0.01gSA and 0.1g ammonium persulfate are added into 93.45g water, and salt ion base liquid is obtained after stirring for 2 hours; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 6:1, fully mixing the foam and the salt solution to obtain a cured foam system, placing the cured foam system in an environment at 130 ℃ for gelling, and gelling for 4.5 hours.
Wherein, FIG. 1 is a photo of the foam system after being injected into the salt ion base liquid at a ratio of 6:1 and cured. The prepared solidified foam system is extremely stable at room temperature, can keep the original volume almost unchanged within more than ten days, and has good fluidity.
Example 2
Weighing raw materials according to the proportion, adding 0.6g of sodium alginate, 0.3g of THSB, 9g of AM, 0.6g of MBA, 0.03gSA, 0.5g of ammonium persulfate and 0.1g1800 million of HPAM into 88.87g of water, stirringStirring for 8 hours to form polymer base liquid; adding 0.06g of CaCl 2 9g of AM, 0.6g of MBA, 0.03gSA and 0.5g of ammonium persulfate are added into 89.81g of water, and the mixture is stirred for 2 hours to obtain salt ion base liquid; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 5:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment with the temperature of 130 ℃ to form gel, wherein the gel forming time is 3.5h.
Example 3
Weighing raw materials according to a ratio, adding 0.6g of sodium alginate, 0.3g of THSB, 12g of AM, 0.8g of MBA, 0.05gSA, 1.0g of ammonium persulfate and 0.2g1800 ten thousand HPAM into 85.05g of water, and stirring for 8 hours to form a polymer base solution; adding 0.08g of CaCl 2 Adding 12g of AM, 0.8g of MBA, 0.05gSA and 1.0g of ammonium persulfate into 86.07g of water, and stirring for 2 hours to obtain a salt ion base solution; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 3:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment with the temperature of 130 ℃ to form gel, wherein the gel forming time is 3h.
Example 4
Weighing raw materials according to the proportion, adding 0.8g of sodium alginate, 0.3g of THSB, 9g of AM, 0.6g of MBA, 0.03gSA, 0.5g of ammonium persulfate and 0.1g1800 ten thousand HPAM into 88.67g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 9g of AM, 0.6g of MBA, 0.03gSA and 0.5g of ammonium persulfate are added into 89.81g of water, and the mixture is stirred for 2 hours to obtain salt ion base liquid; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 3:1, and fully mixing the foam and the salt solution to obtain a cured foam system; the cured foam system described above is placed at 130Gelatinizing at 3.17 deg.C in environment for 3.17 hr.
Example 5
Weighing raw materials according to a ratio, adding 0.8g of sodium alginate, 0.3g of THSB, 12g of AM, 0.8g of MBA, 0.05gSA, 1.0g of ammonium persulfate and 0.1g1800 ten thousand HPAM into 84.95g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 Adding 12g of AM, 0.8g of MBA, 0.05gSA and 1.0g of ammonium persulfate into 86.09g of water, and stirring for 2 hours to obtain a salt ion base solution; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 4:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment with the temperature of 130 ℃ to form gel, wherein the gel forming time is 2.83 hours.
Example 6
Weighing raw materials according to a ratio, adding 1g of sodium alginate, 0.3g of THSB, 9g of AM, 0.6g of MBA, 0.03gSA, 0.5g of ammonium persulfate and 0.1g1800 ten thousand of HPAM into 88.47g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 9gAM, 0.6g MBA, 0.03gSA and 0.5g ammonium persulfate are added into 89.81g water, and salt ion base liquid is obtained after stirring for 2 hours; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 5:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment at 130 ℃ to form gel, wherein the gel forming time is 3.25h.
Example 7
Weighing raw materials according to a ratio, adding 1g of sodium alginate, 0.3g of THSB, 12g of AM, 0.8g of MBA, 0.05gSA, 1.0g of ammonium persulfate and 0.1g1800 ten thousand of HPAM into 84.75g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 Adding 12g of AM, 0.8g of MBA, 0.05gSA and 1.0g of ammonium persulfate into 86.09g of water, and stirring for 2 hours to obtain a salt ion base solution; the polymer base fluid is placed in a stirrer for foaming,stirring at a rotating speed of 5000r/min for 5min to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 6:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the solidified foam system in an environment at 130 ℃ to form gel, wherein the gel forming time is 2.75h.
Example 8
Weighing raw materials according to a ratio, adding 1.2g of sodium alginate, 0.3g of THSB, 9g of AM, 0.6g of MBA, 0.03gSA, 0.5g of ammonium persulfate and 0.1g1800 ten thousand of HPAM into 88.27g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 9g of AM, 0.6g of MBA, 0.03gSA and 0.5g of ammonium persulfate are added into 89.81g of water, and the mixture is stirred for 2 hours to obtain salt ion base liquid; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 6:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment at 130 ℃ to form gel, wherein the gel forming time is 3.17h.
Example 9
Weighing raw materials according to a ratio, adding 1.2g of sodium alginate, 0.3g of THSB, 12g of AM, 0.8g of MBA, 0.05gSA, 1.0g of ammonium persulfate and 0.1g1800 ten thousand HPAM into 84.55g of water, and stirring for 8 hours to form a polymer base solution; adding 0.06g of CaCl 2 Adding 12g of AM, 0.8g of MBA, 0.05gSA and 1.0g of ammonium persulfate into 86.09g of water, and stirring for 2 hours to obtain a salt ion base solution; placing the polymer base solution into a stirrer for foaming, wherein the stirring speed is 5000r/min, and the stirring time is 5min, so as to form a uniform foam system; injecting the foam system into the salt ion base liquid from the bottom according to the ratio of the volume of the bubbles to the volume of the salt solution 6:1, and fully mixing the foam and the salt solution to obtain a cured foam system; and (3) placing the cured foam system in an environment at 130 ℃ to form gel, wherein the gel forming time is 2.67h.
Comparative example 1
The procedure was as described in example 1, except that the sodium alginate in example 1 was replaced with the same weight of water.
Comparative example 2
The procedure is as described in example 1, except that CaCl in example 1 is used 2 The same weight of water was used instead.
Comparative example 3
The procedure was as described in example 1, except that 1800 million HPAMs in example 1 were replaced with the same weight of water.
Test example
1. Photographs of the gel type foam system flow control agent prepared in example 1 after curing for 4 hours, 24 hours and 48 hours under the formation conditions of 22 ten thousand mineralization degrees at 130 ℃ are shown in fig. 2, 3 and 4.
As can be seen from fig. 2, fig. 3 and fig. 4, the gelled gel type foam system flow control agent has a small volume change amplitude in an environment at 130 ℃, and the volume is still maintained at a high level after 72 hours, which indicates that the flow control agent has high gelling strength and is very stable in an environment at 130 ℃. And in the field application process, the plugging agent can play a role in plugging a high-temperature and high-salinity stratum for a long time.
2. The flow regulating effect of the flow regulating agent of the gel type foam system prepared in the examples and the comparative examples is detected. The method comprises the following specific steps: an outcrop core with the length of 10cm and the inner diameter of 2.5cm is saturated by 22 ten thousand salinity brine and then is placed in a core holder; the confining pressure of the core holder is increased to 3MPa, the ISCO pump is adjusted to inject 22 ten thousand salinity saline water under the constant flow condition for water drive, the stratum wetting condition of the core is simulated, and the pump is stopped after the pressure is stable; connecting a nitrogen cylinder with the rock core holder, opening the gas cylinder to adjust the pressure, injecting nitrogen, and measuring the gas flow rate by using a liquid discharge method. Inserting an output end pipeline of the rock core holder into water, waiting for stable discharge of bubbles at an output end, weighing 500mL of water by using a measuring cylinder, plugging the water by using a hand, putting the water into a barrel, inserting the output end pipeline into the measuring cylinder, measuring the time required by liquid discharge, and calculating the flow rate Q 1 (ii) a The prepared cured foam system of 0.3PV is injected reversely, and then 22 ten thousand salinity saline of 0.1PV is injected for replacement; then placing the core holder in a thermostat at 130 ℃ for gelatinizing (gelatinizing time and each solid)The time of the example and the comparative example is kept consistent), after the gelling is finished, the core holder is taken out, then the time required for discharging the liquid is measured by using a liquid discharging method again, and the flow rate Q is calculated 2 Calculating formula eta = (Q) according to plugging rate 1 -Q 2 )/Q 1 Calculating the plugging rate of each core, wherein the plugging result is shown in table 1:
TABLE 1
| Numbering | Q 1 /mL·min -1 | Q 2 /mL·min -1 | η/％ |
| Example 1 | 23.56 | 0.49 | 97.92 |
| Example 2 | 24.12 | 0.47 | 98.05 |
| Example 3 | 23.84 | 0.43 | 98.20 |
| Example 4 | 23.17 | 0.43 | 98.14 |
| Example 5 | 24.09 | 0.37 | 98.46 |
| Example 6 | 24.15 | 0.44 | 98.18 |
| Example 7 | 23.88 | 0.33 | 98.62 |
| Example 8 | 23.97 | 0.35 | 98.54 |
| Example 9 | 24.21 | 0.30 | 98.76 |
| Comparative example 1 | 23.41 | 13.70 | 41.48 |
| Comparative example 2 | 23.38 | 11.95 | 48.88 |
| Comparative example 3 | 23.51 | 3.45 | 80.33 |
According to the results in the table 1, the gel type foam flow regulating agent can meet the plugging requirement of a high-temperature and high-salinity oil reservoir, can effectively plug a gas channeling passage and a high permeability layer, improves the exploitation efficiency of crude oil, and can meet the use requirement of a field.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (9)
1. The gel type foam system flow regulator is characterized in that raw materials for preparing the gel type foam system flow regulator comprise 0.3-0.6 wt% of sodium alginate, 0.1-0.2 wt% of foaming agent, 0.02-0.05 wt% of calcium salt, 6-12 wt% of monomer, 0.4-0.8 wt% of cross-linking agent, 0.01-0.05 wt% of initiator A, 0.1-1 wt% of initiator B, 0.05-0.1 wt% of foam stabilizer and the balance of water;
the foaming agent is tetradecyl hydroxysulfobetaine; the calcium salt is CaCl 2 ；
The monomer is an acrylamide monomer, the cross-linking agent is N-N methylene bisacrylamide, the initiator A is tert-butyl hydroperoxide, the initiator B is ammonium persulfate, and the foam stabilizer is a high-molecular foam stabilizer;
the high-molecular foam stabilizer is anionic polyacrylamide.
2. The jelly type foam system flow regulator according to claim 1, wherein the raw materials for preparing the jelly type foam system flow regulator comprise 0.4-0.5 wt% of sodium alginate, 0.14-0.16 wt% of foaming agent, 0.03-0.04 wt% of calcium salt, 9-12 wt% of monomer, 0.6-0.8 wt% of cross-linking agent, 0.03-0.05 wt% of initiator A, 0.5-1 wt% of initiator B, 0.06-0.09 wt% of foam stabilizer and the balance of water.
3. The jelly type foam system flow modifier according to claim 1, wherein the anionic polyacrylamide has a molecular weight of 1800 ten thousand.
4. A method for preparing the jelly type foam system flow regulator according to any one of claims 1 to 3, wherein the method comprises the following steps:
(1) Weighing the raw materials according to the proportion;
(2) Mixing sodium alginate, a foaming agent, a part of monomers, a part of cross-linking agent, a part of initiator A, a part of initiator B, a foam stabilizer and a part of water uniformly to obtain a polymer base solution;
(3) Uniformly mixing the calcium salt, the residual monomers, the residual cross-linking agent, the residual initiator A, the residual initiator B and the residual water to obtain a salt ion base solution;
(4) Placing the polymer base liquid obtained in the step (2) into a stirrer to be stirred until a uniform and compact foam system is formed;
(5) Injecting the foam system obtained in the step (4) into the salt ion base liquid obtained in the step (3) from the bottom in a ratio of the volume of the bubbles to the volume of the salt solution of (2-6) to 1, and fully mixing to obtain a solidified foam system;
(6) And (6) gelling the cured foam system obtained in the step (5) to obtain the gel type foam system flow regulating agent.
5. The method according to claim 4, wherein in step (2), the mixing time is 6-8h.
6. The process according to claim 4 or 5, wherein in step (3), the mixing time is 1-2h.
7. The method according to claim 4 or 5, wherein in step (4), the conditions of agitation comprise: the rotation speed is 4000-5000r/min, and the time is 4-6min.
8. The process according to claim 4 or 5, wherein in step (6), the temperature of the gelling is from 100 to 130 ℃.
9. Use of the gel type foam system flow modifier according to any one of claims 1 to 4 or the gel type foam system flow modifier prepared by the method according to any one of claims 4 to 8 in the plugging of gas channeling channels in oil reservoirs.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105368423A (en) * | 2015-10-15 | 2016-03-02 | 东营方立化工有限公司 | Chromium-free composite resin gel-type profile control agent for oil exploitation and preparation method and application thereof |
| CN105384845A (en) * | 2014-09-05 | 2016-03-09 | 中国石油化工股份有限公司 | Etherification modified sodium alginate and preparation method thereof, water-based jelly fracturing fluid containing etherification modified sodium alginate, and applications of water-based jelly fracturing fluid containing etherification modified sodium alginate |
| CN105461821A (en) * | 2014-09-05 | 2016-04-06 | 中国石油化工股份有限公司 | Etherification modified seaweed gel, preparation method therefor, seaweed gel containing water-base gelled fracturing fluid and application thereof |
| CN105671028A (en) * | 2016-03-14 | 2016-06-15 | 中国石油天然气股份有限公司 | Microbial self-healing gel profile control agent and preparation method and application thereof |
| CN108929668A (en) * | 2018-07-13 | 2018-12-04 | 中国石油天然气股份有限公司 | Resistance to foaming agent with high salt of one kind and preparation method thereof |
-
2020
- 2020-11-10 CN CN202011246786.7A patent/CN112226219B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384845A (en) * | 2014-09-05 | 2016-03-09 | 中国石油化工股份有限公司 | Etherification modified sodium alginate and preparation method thereof, water-based jelly fracturing fluid containing etherification modified sodium alginate, and applications of water-based jelly fracturing fluid containing etherification modified sodium alginate |
| CN105461821A (en) * | 2014-09-05 | 2016-04-06 | 中国石油化工股份有限公司 | Etherification modified seaweed gel, preparation method therefor, seaweed gel containing water-base gelled fracturing fluid and application thereof |
| CN105368423A (en) * | 2015-10-15 | 2016-03-02 | 东营方立化工有限公司 | Chromium-free composite resin gel-type profile control agent for oil exploitation and preparation method and application thereof |
| CN105671028A (en) * | 2016-03-14 | 2016-06-15 | 中国石油天然气股份有限公司 | Microbial self-healing gel profile control agent and preparation method and application thereof |
| CN108929668A (en) * | 2018-07-13 | 2018-12-04 | 中国石油天然气股份有限公司 | Resistance to foaming agent with high salt of one kind and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 塔河高温高盐油藏冻胶泡沫调驱技术;李亮等;《石油钻采工艺》;20160331;260-266 * |
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