CN110804428A - Profile control composition, profile control agent and preparation method thereof - Google Patents
Profile control composition, profile control agent and preparation method thereof Download PDFInfo
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- IHCCLXNEEPMSIO-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 IHCCLXNEEPMSIO-UHFFFAOYSA-N 0.000 description 2
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The invention relates to a profile control composition, a profile control agent and a preparation method thereof, belonging to the technical field of oil exploitation. The invention provides a profile control agent, which is mainly prepared from water and the following raw materials in parts by weight: 1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer. The profile control agent can preferentially enter a water channeling channel, has high plugging strength after the formation is gelled, can relieve the flat section contradiction of a complex fault block oil reservoir, changes the propulsion direction of injected water, effectively prolongs the production time and improves the oil displacement efficiency of a water-drive oil reservoir. Simple components, simple field preparation process, convenient construction and high temperature resistance. The plugging strength is high, the channeling direction can be effectively plugged, the low-permeability layer is started to absorb water, the effect of the flow direction of injected water is changed on the plane, the well group development effect is improved, and the oil layer utilization degree is improved.
Description
Technical Field
The invention relates to a profile control composition, a profile control agent and a preparation method thereof, belonging to the technical field of oil exploitation.
Background
In the process of thin oil exploitation, water injection exploitation is carried out in the middle and later periods of a thin oil field, due to the influence of factors such as the difference of crude oil viscosity and the heterogeneity of stratum, a main reservoir enters a high water-cut stage, a main reservoir is seriously crossed with water, the exploitation benefit is gradually reduced, contradictions are increasingly prominent, and the recovery ratio of the oil field is seriously influenced.
In order to further improve the development effect, a profile control agent needs to be injected into the oil-water well, the plane contradiction is improved, the water drive wave and volume are enlarged, the recovery ratio is improved, and the oil layer utilization degree is improved.
In recent years, causticized mud profile control and delayed silicic acid gel profile control technologies are mainly applied on site. The common profile control agent has high cost, short effective period and poor effect, and can not meet the requirement of oil field development. At present, the single dose cost of a water well profile control of a second factory for oil extraction in Henan oilfield is more than 300 yuan/square, the profile control of an oil-collecting field is carried out 6 times in nearly three years, the radius is designed to be 1/4-1/5 due to the consideration of cost factors, the injection and profile control dose is only 7700 square, the investment is up to 245 ten thousand yuan, the effective rate difference is only 25%, the effective period is only 97 days, and the deep profile control requirement of an oil reservoir cannot be met.
Disclosure of Invention
The invention aims to provide a profile control composition, and the profile control agent obtained from the profile control composition is beneficial to relieving the flat profile contradiction of a complex fault block oil reservoir and improving the oil displacement efficiency of a water-flooding oil reservoir.
The second purpose of the invention is to provide a profile control agent which can effectively relieve the flat profile contradiction of a complex fault block oil reservoir and improve the oil displacement efficiency of a water-drive oil reservoir.
The third purpose of the invention is to provide a preparation method of the profile control agent.
The technical scheme of the invention is as follows:
a profile control composition comprises the following components in parts by weight:
1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer.
The profile control composition has simple components, simple field preparation process, convenient construction and high temperature resistance, and can meet the profile control requirement of an ordinary oil-producing well.
A profile control agent is mainly prepared from water and the following raw materials in parts by weight:
1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer;
the total weight of water and raw materials is 100 parts.
The profile control agent can preferentially enter a water channeling channel, has high plugging strength after the formation is gelled, can relieve the flat section contradiction of a complex fault block oil reservoir, changes the propulsion direction of injected water, effectively prolongs the production time and improves the oil displacement efficiency of a water-drive oil reservoir.
The profile control agent has high plugging strength, can effectively plug the channeling direction, starts the low-permeability layer to absorb water, changes the flow direction of injected water on a plane, improves the well group development effect and improves the utilization degree of an oil layer.
It can be understood that the total weight of water and raw materials is 100 parts, the effect is better, and in actual operation, the amount of water can be increased or decreased according to actual needs.
The profile control agent provided by the invention is stable when meeting water, defoams when meeting oil, does not block oil when water blocking, has good selectivity, and has the characteristic of little damage to an oil storage layer.
Preferably, the feed is mainly prepared from water and the following raw materials in parts by weight:
3-7 parts of modified starch, 4-6 parts of acrylamide monomer, 0.1-0.2 part of cross-linking agent, 0.01-0.05 part of initiator and 0.05-0.1 part of stabilizer;
the total weight of water and raw materials is 100 parts.
By reasonably adjusting and optimizing the use amounts of the modified starch, the acrylamide monomer, the cross-linking agent, the initiator and the stabilizer, the obtained profile control agent has more excellent comprehensive performance, can better relieve the flat section contradiction of a complex fault block oil reservoir, changes the propulsion direction of injected water, effectively prolongs the production time, and improves the oil displacement efficiency of a water-driven oil reservoir.
Preferably, the modified starch is a-starch. The modified starch is helpful to be dissolved and expanded into semitransparent paste in cold water, the paste mass has viscoelasticity, good stability and good suspension property, and is cemented with acrylamide to form a network structure so as to increase the gel volume.
Preferably, the acrylamide-based monomer is acrylamide. Acrylamide can be dissolved in water to form a water-soluble polymer, and is crosslinked with bisacrylamide in a solution to form a three-dimensional network structure.
Preferably, the cross-linking agent is bisacrylamide. Bisacrylamide is used as a crosslinking agent for acrylamide systems in gel casting. With the increase of the dosage of the cross-linking agent, the cross-linking among the molecules is increased, and a huge network structure mainly comprising modified starch molecules is gradually formed, so that the gelling strength is greatly increased.
Preferably, the initiator is potassium persulfate. The potassium persulfate is a key factor influencing the gel forming time of the profile control water shutoff agent, and the gel forming time of the gel system at a certain temperature or different temperatures can be changed by adjusting the dosage of the initiator.
Preferably, the stabilizer is a sulfite or bisulfite. The sulfite is used as a stabilizer and a protective agent of a modified starch and acrylamide monomer gel system, so that a small amount of oxygen still contained in injected colloid exists, and the initiation time of an initiator is inhibited.
Preferably, the stabilizer is sodium sulfite. Sodium sulfite is used as a stabilizer and a protective agent of a modified starch and acrylamide monomer gel system, so that a small amount of oxygen still contained in injected gel exists, and the initiation time of an initiator is inhibited.
The preparation method of the profile control agent comprises the following steps:
dissolving modified starch and acrylamide monomers in water, adding a cross-linking agent, an initiator and a stabilizer, and reacting to obtain the profile control agent.
According to the preparation method, the profile control agent can be prepared on site only by dissolving the modified starch and the acrylamide monomer in water and then adding the cross-linking agent, the initiator and the stabilizer, and the preparation process is simple and convenient to construct.
The profile control agent can be applied to oil exploitation, can relieve the flat section contradiction of a complex fault block oil reservoir, changes the propulsion direction of injected water, effectively prolongs the production time, and improves the oil displacement efficiency of a water-drive oil reservoir. For example, the geological reserve 2410 × 104t of the common heavy oil reservoir in the Henan oilfield enters the middle and later stages of water drive development, but the profile control effect of the current technology on a heavy oil common-recovery block is poor. The reasons for the situation are that the profile control agent can effectively balance the flat profile contradiction of complex fault blocks, realize the uniform propulsion of injected water and improve the water-drive reservoir development effect, besides, because the recovery degree is high, the permeability difference of the reservoir is large, the foundation of stratum materials is weak, the grade of the heavy oil normally-recovered reservoir is low, the reservoir is thin, the interlayer is more, the stratum is relatively loose, the permeability is high, the porosity is large, the depletion of the stratum is serious, the water channeling channel is large, the residual reserve recovery cost is high, the flat profile contradiction is prominent, the problems of water channeling and non-uniform profile propulsion at different degrees exist, and the recovery ratio of the oil field is seriously influenced.
Drawings
FIG. 1 is a plot of injection pressure versus injection time for a gel system of example 1 of a profile control agent of the present invention in a single sand pipe;
FIG. 2 is a water absorption index curve before and after profile control of a king 312 well in example 1 of the profile control agent of the present invention;
FIG. 3 is a plot of pressure drop before and after profile control for a King 312 well in accordance with example 1 of the profile control agent of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The profile control composition comprises the following components in parts by weight:
1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer.
Preferably, the composition comprises the following components in parts by weight:
3-7 parts of modified starch, 4-6 parts of acrylamide monomer, 0.1-0.2 part of cross-linking agent, 0.01-0.05 part of initiator and 0.05-0.1 part of stabilizer.
Preferably, the modified starch is α -starch.
Preferably, the acrylamide-based monomer is acrylamide.
Preferably, the cross-linking agent is bisacrylamide.
Preferably, the initiator is a persulfate.
Preferably, the stabilizer is a sulfite or bisulfite.
Preferably, the stabilizer is sodium sulfite.
In the profile control agent, the total weight of water and raw materials is 100 parts. The raw materials are modified starch, acrylamide monomer, cross-linking agent, initiator and stabilizer.
In the profile control agent, α -starch is also called as pregelatinized starch, and α -starch is feed-grade pregelatinized starch, preferably potato pregelatinized starch or cassava pregelatinized starch.
Example 1 of the Profile control agent
The profile control agent of the embodiment is prepared from water and the following raw materials in parts by weight:
5 parts of modified starch, 5 parts of acrylamide monomer, 0.125 part of bisacrylamide, 0.0125 part of potassium persulfate and 0.075 part of sodium sulfite. The total weight of water, modified starch, acrylamide monomer, bisacrylamide, potassium persulfate and sodium sulfite is 100 parts.
The modified starch is α -starch (Beijing Xingbao Hongyou industry trade company, Limited) and has the technical requirements of white powder, no mechanical impurities, capability of being dissolved in cold water to form semitransparent paste, viscoelasticity of paste mass, 75% whiteness (425nm blue light reflectivity), 90% fineness (60-mesh sieve passing rate), viscosity of up to 300 mPa.s.pH value (1% starch paste solution) of 5.5-7.5, water content of less than or equal to 8.0, and good suspension property and glue solution stability of ash content of 0.50%.
Examples 2 to 5 of profile control Agents
Examples 2 to 5 of the profile control agent are different from example 1 of the profile control agent in the amount of each raw material, specifically, as shown in table 1, the unit of the amount of each raw material in table 1 is part by weight. The sources of the respective raw materials were the same as in example 1 of the profile control agent, and in each example, the total weight parts of water and modified starch, acrylamide monomer, bisacrylamide, potassium persulfate, and sodium sulfite were also 100 parts.
TABLE 1 example 1 of Profile control agent and examples 2 to 5 of Profile control agent parts by weight of the respective raw materials
| Modified starch | Acrylamide monomer | Bisacrylamide | Potassium persulfate | Sodium sulfite | |
| Example 1 | 5 | 5 | 0.125 | 0.0125 | 0.075 |
| Example 2 | 1 | 10 | 0.1 | 0.01 | 0.1 |
| Example 3 | 10 | 1 | 0.5 | 0.1 | 0.01 |
| Example 4 | 3 | 6 | 0.1 | 0.05 | 0.05 |
| Example 5 | 7 | 4 | 0.2 | 0.01 | 0.1 |
Examples 6 to 8 of profile control agents
Examples 6-8 of the profile control agent differ from example 1 of the profile control agent in the amount of the crosslinking agent bisacrylamide, specifically as shown in table 2, the unit of the amount of the crosslinking agent bisacrylamide in table 2 is parts by weight. The water is 100 parts by weight of the total weight of the modified starch, the acrylamide monomer, the bisacrylamide, the potassium persulfate and the sodium sulfite.
TABLE 2 parts by weight of bisacrylamide in examples 1 and 6 to 8 of Profile control agent
| Bisacrylamide | |
| Example 1 | 0.125 |
| Example 6 | 0.1 |
| Example 7 | 0.5 |
| Example 8 | 0.2 |
Comparative example 1
The profile control agent of this comparative example was different from example 1 of the profile control agent in the amount of the crosslinking agent bisacrylamide, which was 0.06 parts by weight in this comparative example, and 100 parts by weight of water based on the total weight of the modified starch, the acrylamide monomer, the bisacrylamide, the potassium persulfate, and the sodium sulfite.
Comparative example 2
The profile control agent of this comparative example is different from example 1 of the profile control agent in the amount of the crosslinking agent bisacrylamide, which is 1 part by weight in this comparative example, and water, which is 100 parts by weight based on the total weight of the modified starch, the acrylamide monomer, the bisacrylamide, the potassium persulfate, and the sodium sulfite.
Example 9 of the Profile control agent
The profile control agent of this example is different from example 1 of the profile control agent in the kind of the stabilizer, sodium hydrogen sulfite is used as the stabilizer in this example, and the remaining raw materials and the amounts are the same as those in example 1 of the profile control agent.
Example 1 of the Profile composition
The profile control composition of this example consists of the following components in parts by weight:
5 parts of modified starch, 5 parts of acrylamide monomer, 0.125 part of bisacrylamide, 0.0125 part of potassium persulfate and 0.075 part of sodium sulfite.
The sources of the components are the same as in example 1 of the profile control agent.
Examples 2-8 of Profile compositions
Examples 2-8 of the profile control compositions differ from example 1 of the profile control composition in the amounts of the components used, which are shown in table 3 for examples 2-8 of the profile control compositions. The sources of the components are the same as in example 1 of the profile control agent. TABLE 3 parts by weight of the components of examples 1-8 of the profile control compositions
| Modified starch | Acrylamide monomer | Bisacrylamide | Potassium persulfate | Sodium sulfite | |
| Example 1 | 5 | 5 | 0.125 | 0.0125 | 0.075 |
| Example 2 | 1 | 10 | 0.1 | 0.01 | 0.1 |
| Example 3 | 10 | 1 | 0.5 | 0.1 | 0.01 |
| Example 4 | 3 | 6 | 0.1 | 0.05 | 0.05 |
| Example 5 | 7 | 4 | 0.2 | 0.01 | 0.1 |
| Example 6 | 5 | 5 | 0.1 | 0.0125 | 0.075 |
| Example 7 | 5 | 5 | 0.5 | 0.0125 | 0.075 |
| Example 8 | 5 | 5 | 0.2 | 0.0125 | 0.075 |
Example 9 of the Profile control composition
The profile control composition of this example differs from the profile control composition of example 1 in the type of stabilizer, which in this example is sodium bisulfite, and the remaining raw materials and amounts are the same as in profile control composition of example 1.
Example 1 of the preparation of the Profile control agent
The preparation method of the embodiment comprises the following steps:
weighing the raw materials according to the dosage of the profile control agent in example 1, dissolving the modified starch and the acrylamide monomer in water, adding bisacrylamide, potassium persulfate and sodium sulfite, and reacting for 20 minutes to obtain the profile control agent.
Examples 2 to 9 of the preparation of the profile control agent
Examples 2 to 9 of the process for preparing the profile control agent correspond to the raw materials used in examples 2 to 9 of the profile control agent, respectively, and the process for preparing the profile control agent in examples 2 to 9 corresponds to the process for preparing the profile control agent in example 1.
Comparative example 3
This comparative example is different from example 1 of the profile control agent in that the profile control agent of this comparative example further comprises 0.4 parts by weight of sodium hydroxide, and the remaining raw materials and amounts are the same as those of example 1 of the profile control agent.
Test example 1
The typical oil field stratum water composition in the Nanyang region is obtained according to the oil reservoir test (see Table 4), and the stratum water composition is simulated in proportion according to the experiment requirements, so that the simulated stratum water for the experiment is obtained.
TABLE 4 WANG-CONCENTRATION WATER COMPOSITION FOR OIL FIELD
Simulated formation water with different degrees of mineralization is used, the simulated formation water and the profile control agent (example 1 of the profile control agent) prepared in the simulated formation water are placed in a container for standing, the gelling condition under the condition of simulated formation is observed, and the phenomena of precipitation, flocculation and the like are observed. Observing the gel compatibility (the gel changes along with the environmental mineralization degree) and the dissolution compatibility; then measuring the change of gelling time and gelling strength, and measuring the influence of mineralization on the aqueous solution. The results obtained are shown in table 5.
TABLE 5 static evaluation chart of compatibility
As can be seen from Table 5, there is no compatibility problem of gelling of the system in a changing mineralization environment, and no precipitation flocculation phenomenon due to the compatibility problem occurs. Along with the increase of the degree of mineralization, the strength of a colloid system after being gelatinized does not change greatly, the viscosity and the modulus after being gelatinized basically increase along with the increase of the degree of mineralization, the system is still a strong colloid system, and the tongue shape does not change after the bottle is turned over.
Test example 2
The change in viscosity of the profile control agent prepared in the room of example 1 was measured at different water bath temperatures, and the magnitude of the effect of the temperature on the profile control agent of example 1 was observed. Temperature selection: 45 ℃, 60 ℃ and 70 ℃. The results obtained are shown in table 6.
TABLE 6 influence of temperature on gelling
According to the experimental results, in the gelling process, the temperature of the system is increased, the gelling time is shortened, the viscosity, the storage modulus and the loss modulus after gelling are reduced, but the strength of the system is not changed greatly, the change rate is within 5 percent, and the system still belongs to a super-strong gel system. The temperature is 45-70 ℃, the system can be gelled, and the gelled system shows good viscoelasticity.
Test example 3
The gel system obtained in example 1 of the profile control agent was tested for breakthrough pressure using a single sand pipe. The experimental temperature was 55 ℃; the experimental water was the formation water of the oil field in Henan. The experimental sand pipe adopts a sand filling pipe with the diameter of 3.0cm and the length of 60 cm. 20-mesh sand with the same grain diameter is used, and the permeability of the filled sand pipe is 54.4 mD. The experiment uses a single sand pipe to measure the breakthrough pressure, and the optimal injection slug is 0.4 PV. See table 7 for details.
TABLE 7 Sand filling pipe injection condition table
| Total weight of sand pack | 755.23g |
| 60cm sand pipe total PV | 133.64mL |
| Permeability rate of penetration | 54.4mD |
| Gel injection amount | 0.4PV(53.5mL) |
| Discharge capacity | 0.5mL/min |
The specific experimental steps are as follows:
(1) injecting water into the model until the model is saturated, measuring the pore volume and calculating the porosity;
(2) measuring the water phase permeability; the profile control agent with the formula of the gel system is prepared and then injected into the sand filled with the gel system at the flow rate of 0.5 mL/min.
(3) Keeping the temperature at 55 ℃, and measuring the breakthrough pressure after 24 hours. The breakthrough was made with water injection at a flow rate of 3 mL/min.
The pressure profile of the test results with injection time is shown in fig. 1. Along with the increase of the injection amount, the system and the sand cementation are broken through by a subsequent injection system, at the moment, the colloid moves integrally in the sand, namely, the colloid moves in the sand by a displacement medium, and the displacement process is performed by relatively flat pressure stabilization after the pressure drop of 35min on the way. The breakthrough pressure after the test reaches 18MPa, which shows that the gel has good plugging performance.
Test example 4
In the middle of China, the water well king 312 well of the oil extraction F factory in an oil field is transferred and injected in 1991 in 7 months, and at present, three-stage four-stage water injection and water injection layer positions are divided: II 12/Ⅲ11.221.2/Ⅲ51/Ⅲ61.2And the layer corresponds to the 5 oil production wells. King 312 well III 12、Ⅲ21The cross flow of the layer injection horizontal plane is serious, and the effect of the oil well is uneven. King 312 well III 12The layer corresponds to 4 oil production wells: the king 35 well is the dominant direction, the wangxin 36 well is the secondary dominant direction, and the king 201 and the king 206 wells are mainly affected by the boundary water, have high water content and are poor in effect. King 35 well currently produces III 12、21And for the layer is flooded with water, 26.8 tons of daily liquid production, 0.3 ton of daily oil production, 99 percent of water content and 73 meters of working fluid level are produced at present. King 65 well production III 21、51、61.2Layer of since III 21The layer is the superior direction of water injection of the king 27 of the adjacent well, the water injection direction of the king 312 well is not affected, the plane is unbalanced, and the high water content is temporarily closed at present. Wangxin 36 well currently produced III 12Layer, daily liquid yield 14.8 tons, daily oil yield 1.4 tons, water content 90.4 percent and working fluid level 280 m. To enlarge 312 wells III 11、Ⅲ21The water injection wave reaches the volume, plane cross flow is inhibited, and the well III 1 is treated1、Ⅲ21Layer implementation ofAnd (6) cutting open.
The water absorption index curves before and after the profile control of the king 312 well are shown in figure 2. In FIG. 2, yAfter adjustment＝0.029x+5.4409，R2＝0.9869，IwAfter adjustment＝34.48m3/MPa·d，yBefore adjustment＝0.0426x+4.2276，R2＝0.9934，IwAfter adjustment＝23.47m3/MPa.d, wherein R2The more the measuring points are, the more the R is, the more the relation curve of the water absorption capacity of the water measuring well under different pressures and different days is2Close to 1, Iw is the daily water absorption under a certain pressure, the starting pressure and the water absorption index before and after profile control of the king 312 well are shown in table 8, as can be seen from fig. 2 and table 8, the starting pressure rises after profile control of example 1 in which the king 312 well adopts the profile control agent, and under the condition that the water injection pressure is obviously improved, the current water injection pressure and the daily water injection amount are relatively stable, which indicates that the profile control agent in the stratum still acts, the effective period is relatively long, and the high permeable layer of the stratum is effectively blocked.
TABLE 8 CONTRAST METER OF STARTING PRESSURE AND ABSORPTION INDEX BETWEEN AND AFTER CONDITIONING
The pressure drop curve before and after the profile control of the king 312 well is shown in fig. 3, and as can be seen from fig. 3, the pressure drop curve becomes gentle, which indicates that the formation water channeling channel is effectively blocked.
The well group effects before and after the king 312 well profile are shown in table 9.
Table 9 well group effect before and after 312 well profile control
As can be seen from Table 9, after the profile control of the 312 king well, the water absorption of the main stratum is controlled, the water absorption utilization degree of the poor oil layer is improved, and the well group oil well is effective. The daily liquid yield is reduced from 125.0 tons to 111.0 tons before and after profile control, the daily oil yield is increased from 3.4 tons before profile control to 5.4 tons after profile control, the water content is reduced from 97.2% to 87.3%, the water content increasing speed is controlled, and the oil is increased by 268 tons in total.
Experimental results show that the profile control agent of the embodiment 1 is injected into a normal-production water injection well, the profile control agent system is stable when meeting water, does not block oil when blocking water, has good selectivity, and has the characteristic of little damage to an oil storage layer. After entering the deep part of the stratum, the profile control agent selectively and preferentially enters a large water outlet channel and a large crack, a plugging barrier lasting for a certain period is formed in a short time, the distribution of water on the section of an oil layer is driven, the displacement environment of the reservoir is improved, and the sweep coefficient and the oil displacement efficiency are improved.
Test example 5
The profile control agents of examples 1-9 and comparative examples 1-3 were tested for viscosity, storage modulus, loss modulus, efficiency and pot life, respectively, after gelling. The preparation method of the gel of the profile control agent of examples 1 to 9 and comparative examples 1 to 3 is as follows:
(1) selection and determination of a main agent system. The method is characterized in that the method is limited to strong channeling channels, oilfield water mineralization degree, stratum temperature and other factors, modified starch and acrylamide monomers are selected as main agents, the modified starch, the acrylamide monomers and an initiator are placed in a stratum environment, and the two main agents react in an underground temperature environment by utilizing stratum energy.
(2) Determination of crosslinking reaction mode and crosslinking agent. Modified starch and monomer are subjected to graft copolymerization and crosslinking, an intramolecular and intermolecular simultaneous crosslinking mode is selected, a crosslinking agent and a stabilizing agent are added, and the three-dimensional network crosslinked high-elasticity strong gel is obtained after reaction.
(3) Selecting a gelling control agent, determining the formation temperature to be 60 ℃, wherein the gelling control agent is persulfate.
Examples 1-9 of the profile control agent control the dynamic gel formation time by controlling the contact chance of the active groups in the porous media through a special graft copolymerization and crosslinking process, retarding the contact rate. The system starts to gel after 8-20 hours under a static condition, but does not gel in a dynamic process of continuous migration in a porous medium; after the gel is injected into a preset position, the gel begins to gel after several hours of waiting, and the maximum strength is reached after 72 hours generally. The application in mine field recommends waiting for more than 5 days to ensure full crosslinking and gelling.
The breakthrough pressures of the profile control agents of examples 1 to 9 and comparative examples 1 to 3 of the profile control agent were respectively tested, the breakthrough pressure test method was the same as in test example 3, the viscosity and storage modulus after gelling and the loss modulus test method were the same as in test example 2, the effective rate means that the profile control agent was measured in a multi-group sand-packed pipe test, and the effective period was calculated according to the time for starting performance deterioration after being left for a period of time and retesting whether the performance was deteriorated. The results obtained are shown in Table 10.
TABLE 10 Properties of the profile control agents of examples 1 to 9 and comparative examples 1 to 3 of the profile control agent
As is clear from table 10, the profile control agent of example 1 had a profile control effective rate of 71% and a validity period of 95 days, and the viscosity after gelling was 69Pa · s or more, and the storage modulus after gelling was 90Pa or more, and the overall performance was excellent.
Claims (10)
1. The profile control composition is characterized by comprising the following components in parts by weight:
1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer.
2. The profile control agent is characterized by being mainly prepared from water and the following raw materials in parts by weight:
1-10 parts of modified starch, 1-10 parts of acrylamide monomer, 0.1-0.5 part of cross-linking agent, 0.01-0.1 part of initiator and 0.01-0.1 part of stabilizer;
the total weight of water and raw materials is 100 parts.
3. The profile control agent according to claim 2, which is mainly prepared from water and the following raw materials in parts by weight:
3-7 parts of modified starch, 4-6 parts of acrylamide monomer, 0.1-0.2 part of cross-linking agent, 0.01-0.05 part of initiator and 0.05-0.1 part of stabilizer;
the total weight of water and raw materials is 100 parts.
4. A profile control agent according to claim 2 or 3, wherein the modified starch is α -starch.
5. Profile control agent according to claim 2 or 3, characterized in that the acrylamide-based monomer is acrylamide.
6. Profile control agent according to claim 2 or 3, characterized in that the cross-linking agent is bisacrylamide.
7. A profile control agent according to claim 2 or 3, wherein the initiator is potassium persulfate.
8. Profile control agent according to claim 2 or 3, characterized in that the stabilizer is a sulfite or bisulfite.
9. Profile control agent according to claim 8, characterized in that the stabilizer is sodium sulfite.
10. A method of preparing a profile control agent according to claim 2, comprising the steps of:
dissolving modified starch and acrylamide monomers in water, adding a cross-linking agent, an initiator and a stabilizer, and reacting to obtain the profile control agent.
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| CN113234196A (en) * | 2021-05-13 | 2021-08-10 | 陕西科技大学 | Self-adaptive controllable liquid rubber plug and preparation method and application thereof |
| CN114573753A (en) * | 2022-03-04 | 2022-06-03 | 东营勤和工贸有限公司 | High molecular resin adhesive for profile control and water plugging of oil well and water well |
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