CN113249103A - Seawater-based polyacrylamide high-temperature jelly profile control system - Google Patents
Seawater-based polyacrylamide high-temperature jelly profile control system Download PDFInfo
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Abstract
The invention provides a seawater-based polyacrylamide high-temperature jelly profile control system, which comprises a main agent, a cross-linking agent, a high-temperature stabilizer and simulated seawater; the main agent is a polyacrylamide polymer; the cross-linking agent is an organic phenolic cross-linking agent; the high-temperature stabilizer is one or a combination of thiourea, amino acid, oxalate, citrate and salicylate. The seawater-based polyacrylamide high-temperature jelly profile control system provided by the invention can meet the use requirements of seawater sample preparation and a high-temperature environment of 90-130 ℃ in profile control and water shutoff operations of offshore high-temperature oil fields; when the oil-water-based high-pressure oil-water-based high-pressure oil reservoir is used, the high-pressure oil-water-based high-pressure oil reservoir preferentially enters a high-pressure permeable layer to form a high-strength non-flowing gel system under the condition of an oil reservoir, and the purposes of plugging the high-pressure layer, improving the injection efficiency and increasing the crude oil recovery efficiency can be achieved; the gel forming time is long, the jelly strength is high, the gel can be stabilized for a long time for 60 days under a high-temperature environment without being damaged, and the plugging capability is better.
Description
Technical Field
The invention belongs to the technical field of chemical profile control and water shutoff of oil fields, and particularly relates to a seawater-based polyacrylamide high-temperature jelly profile control system.
Background
The jelly is colloid with a three-dimensional network structure formed by a high molecular polymer and a cross-linking agent through a cross-linking effect, and is widely applied to profile control and water shutoff of onshore oil fields due to controllable gelling strength and gelling time and low cost, so that better water control and oil increase effects are achieved. With the vigorous development of offshore oil fields, a large amount of water/gas is discharged from an oil well, and the channeling becomes an increasingly prominent problem, so that profile control and water plugging operation needs to be carried out urgently to plug a high-permeability channeling channel. But the characteristics of seawater sample preparation (high salinity and high calcium and magnesium ion concentration) and high-temperature oil reservoir (>120 ℃) of part of offshore oil fields put higher requirements on a cutting system. The traditional polyacrylamide gel has good gelling strength and controllable gelling time in medium and low temperature reservoir (70-90 ℃) and low calcium and magnesium ion concentration environments, and is widely applied. However, in the environment with high temperature (>120 ℃) and high calcium and magnesium ion concentration, the polyacrylamide gel has poor stability and is easy to be dehydrated and damaged, and the application of the polyacrylamide gel in offshore high-temperature oil reservoirs is limited. Therefore, a seawater-based high-temperature jelly profile control system needs to be constructed according to the characteristics of seawater sample preparation and high-temperature environment.
CN104342099A discloses a strength-controllable gel profile control agent for high-water-content oil field deep profile control and preparation method thereof, the system is composed of anionic polyacrylamide, organic phenolic cross-linking agent, auxiliary agent acetic acid and tert-butyl hydroperoxide, and the cross-linking reaction time is 12-36 hours at 55-90 ℃. The strength of the jelly is gradually reduced under the comprehensive action of the regulator and the oil reservoir temperature, dynamic migration is generated under the drive of subsequent water flooding or polymer flooding, when the breakthrough pressure gradient of the profile control agent is equal to the formation pressure gradient, the jelly stays at the deep part of the formation, when the strength of deep liquid flow is reduced again after a period of time, the jelly is transported to the deep part of the formation under the drive of the subsequent water flooding or polymer flooding and stays at the position where the breakthrough pressure gradient is equal to the formation pressure gradient again, and the liquid flow diversion of the deeper formation is realized. Compared with a conventional profile control system, the deep profile control system can better achieve the purpose of deep profile control. The disadvantages of this method are: 1) the experimental temperature is only 55-90 ℃, and the use requirement of the high-temperature (>120 ℃) environment cannot be met; 2) after aging for 30 days, the gel is seriously damaged and cannot meet the requirement of long-term use under high-temperature and high-salt environments.
CN103232839A discloses a water shutoff agent suitable for water shutoff and profile control of a high-temperature and high-salinity oil reservoir, which consists of a main agent, a cross-linking agent, a heat stabilizer and a flexible stabilizer, wherein the use concentrations are respectively 5%, 2% and 0.08%. The main agent is sulfonated tannin extract, and provides a crosslinking reaction between a phenolic hydroxyl crosslinking point and an aldehyde crosslinking agent; the cross-linking agent is organic phenolic cross-linking agent-urotropine and hydroquinone; the stabilizing agents are water glass and nonionic polymer respectivelyThe acrylamide can improve the thermal stability of the water shutoff agent system at high temperature and improve the toughness and elasticity of the water shutoff agent system. The water shutoff agent is suitable for the conditions of 90-150 ℃ and the mineralization degree of more than 2.0 multiplied by 105And (3) plugging water and profile control of the mg/L oil layer, wherein the gelling time is 5-28 hours, and the strength of the formed jelly is 0.06-0.085 MPa. The water shutoff agent has good integrity, and the plugging rate of the water shutoff agent to the rock core reaches more than 92 percent. The disadvantages of this method are: 1) the use concentration is high, and the cost is high; 2) the sample preparation by using clean water has undefined adaptability to high mineralization degree, particularly high calcium and magnesium ion concentration, and cannot meet the requirement of seawater sample preparation of offshore oil fields; 3) the main agent and the high-temperature stabilizer used in the invention of the present application are significantly different from those of the aforementioned patents, and can overcome the above-mentioned problems.
CN111808585A discloses a slow-crosslinking temperature-resistant salt type high-strength jelly which is composed of a main agent, an aldehyde crosslinking agent, a catalyst and a stabilizer, wherein the mass percentages of the components are 6-7.5%, 0.3-0.6%, 0.25-0.5% and 2-4% respectively. The temperature-resistant salt-tolerant gel is high-strength polyvinyl alcohol gel, and a three-dimensional network structure is formed by the acetal reaction and crosslinking of polyvinyl alcohol and an aldehyde crosslinking agent. The polyvinyl alcohol serving as the main agent is a non-ionic polymer, the water solubility is good, the hydrolysis problem does not exist under the high-temperature condition, and the jelly meets Ca2+、Mg2+No hardening, excellent temperature resistance and salt tolerance; the catalyst is chlorine-containing organic matter, HCl can be continuously hydrolyzed in water, and H is continuously provided for reaction+Thereby continuously catalyzing the reaction and achieving the effect of slow crosslinking; the aldehyde cross-linking agent is terephthalaldehyde, and the stabilizing agent is nano-SiO2. The slow crosslinking can be realized under the high-temperature condition, the gelling time is 1.5-22 h, and the gelling strength can reach 0.0091 MPa. At a temperature of 130 ℃ and a degree of mineralization of 22X 104The strength was high with little dehydration for about 90 days under the condition of mg/L. The disadvantages of this method are: 1) the main components of the jelly are high in use concentration and difficult to obtain, so that the problem of high cost is solved; 2) the chlorine-containing substance is used as a catalyst, so that the actual use is dangerous; 3) the main agent and the high-temperature stabilizer used in the invention of the present application are significantly different from those of the aforementioned patents, and can overcome the above-mentioned problems.
CN105400503A discloses a high-temperature and high-salt resistant oil reservoir profile control water shutoff agent and a preparation method thereof. The high-temperature and high-salt resistant oil reservoir profile control water shutoff agent comprises: suspension and plugging agent particles; the plugging agent particles take inorganic siliceous materials as an inner core, a thermal swelling crosslinked resin film as an inner-layer coated film and a rigid resin protective film as an outer-layer coated film; the inner layer is coated with the membrane to coat the inner core, and the outer layer is coated with the membrane to coat the inner layer; the suspension comprises water, guar gum and sodium borate. The content of the plugging agent particles is 1-10 wt%, the content of the guanidine gum is 0.2-1 wt%, the content of the sodium borate is 0.1-0.3 wt%, and the balance is water. The profile control water shutoff agent can set different critical temperature values according to oil reservoirs with different temperatures, so that the water shutoff agent is injected at lower pressure, and the water shutoff agent can realize adhesion plugging after reaching a corresponding temperature region in the deep part of the reservoir, so that the bridging plugging effect of the inner core framework is more stable, and the plugging effect is enhanced. The disadvantages of this method are: 1) the invention of the patent is a remarkably different high-temperature jelly glue system, and has the advantages of low cost and simple process; 2) the said patent uses tap water for preparation, has no clear adaptability to high salinity, especially high calcium and magnesium ion concentration, and can not meet the use requirement of sea water sample preparation.
CN111040750B discloses a composite temperature-resistant jelly plugging agent, which is composed of a main agent modified nano graphite/polyacrylamide composite material, a cross-linking agent and a stabilizing agent. The composite temperature-resistant jelly plugging agent is suitable for a use environment with the mineralization degree of 20 ten thousand mg/L at 130-180 ℃, the gelling time is controllable within 6-48 h, the gelling strength is high, and the stability is strong. The plugging rate is as high as more than 90%. The modified nano graphite is water-based and dispersed, has the characteristics of soft texture, self-lubrication, environmental friendliness and good stability, and can strengthen the thermal stability of the gel plugging agent under the conditions of high temperature and high salinity oil reservoir. The disadvantages of this method are: 1) the invention relates to a nano graphite stable reinforced jelly stability, which is characterized by complex preparation and high use cost, and the invention of the applied patent is a significantly different high temperature jelly system, which has the advantages of low cost and simple process, and the jelly main agent, the cross-linking agent and the stabilizing agent are different from the above patents; 2) the adaptability of the above patent to the environment with high calcium and magnesium ion concentration in seawater is not clear, and the use requirement of seawater sample preparation cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a seawater-based polyacrylamide high-temperature jelly profile control system which can meet the requirement of seawater sample preparation (salinity) of offshore oil fields>30000mg/L，Ca2++Mg2+>1600mg/L) and high temperature environment (>The use requirement of 120 ℃) is that the jelly has high strength, strong stability and better plugging capability after being gelled.
The specific technical scheme is as follows:
a seawater-based polyacrylamide high-temperature jelly profile control system comprises a main agent, a cross-linking agent, a high-temperature stabilizer and simulated seawater;
the main agent is a polyacrylamide polymer;
the cross-linking agent is an organic phenolic cross-linking agent;
the high-temperature stabilizer is one or a combination of thiourea, amino acid, oxalate, citrate and salicylate.
The weight percentage composition is as follows: 0.4 to 0.8 percent of main agent; 0.3 to 0.4 percent of cross-linking agent; 0.4 to 0.8 percent of high-temperature stabilizer; the balance is simulated seawater.
The main agent is nonionic polyacrylamide; the relative molecular mass of the nonionic polyacrylamide is 1800 multiplied by 104. The cross-linking agent is urotropine; the phenolic crosslinking agent is one or a combination of hydroquinone and resorcinol.
Simulating total salinity of seawater>30000mg/L，Ca2++Mg2+>1600mg/L。
The simulated seawater ion composition, K++Na+：10686mg/L，Ca2+：439mg/L，Mg2+：1211mg/L，Cl-：19457mg/L，SO4 2-：19457mg/L，HCO3 -：226mg/L，CO3 2-: 0mg/L and total mineralization is 33645 mg/L.
In one preferred embodiment, the profile control system consists of 0.8% of nonionic polyacrylamide, 0.3% of urotropine, 0.3% of resorcinol, 0.4% of high-temperature stabilizer and 98.2% of simulated seawater.
In the second preferred embodiment, the profile control system consists of 0.6% of nonionic polyacrylamide, 0.3% of urotropine, 0.3% of resorcinol, 0.6% of high-temperature stabilizer and 98.2% of simulated seawater.
In a third preferred scheme, the profile control system consists of 0.4 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.8 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
Fourth, the preferred profile control system consists of 0.8% of non-ionic polyacrylamide, 0.4% of urotropine, 0.3% of resorcinol, 0.4% of high-temperature stabilizer and 98.1% of simulated seawater.
Fifth, the preferred profile control system consists of 0.6% of nonionic polyacrylamide, 0.4% of urotropine, 0.3% of resorcinol, 0.6% of high temperature stabilizer and 98.1% of water.
Sixth of the preferred embodiment, the profile control system consists of 0.4% of nonionic polyacrylamide, 0.4% of urotropine, 0.3% of resorcinol, 0.8% of high-temperature stabilizer and 98.1% of simulated seawater.
The invention discloses a preparation method of a seawater-based polyacrylamide high-temperature gel profile control system, which comprises the following steps: adding the main agent, the cross-linking agent and the high-temperature stabilizer into simulated seawater in turn while stirring, and continuously stirring until the mixture is uniform.
The seawater-based polyacrylamide high-temperature jelly profile control system is suitable for seawater sample preparation (mineralization degree)>3.0×104mg/L, calcium and magnesium ion concentration>1600mg/L) and the use requirement of a high-temperature environment of 90-130 ℃, the gelling time is 9-26 h, and the gelling strength is 4000-10000 mPa.
The seawater-based polyacrylamide high-temperature jelly adjusting and splitting system can keep the strength at 1500mPa after being aged at high temperature for 60 days by using seawater sample preparation and under the using condition of 120 ℃ and above, the dehydration rate is less than 10%, and the residual resistance coefficient in a rock core reaches above 160.
The invention has the technical characteristics that: the profile control system for the seawater-based polyacrylamide high-temperature jelly is composed of a main agent, a cross-linking agent and a high-temperature stabilizer, wherein the organic phenol-aldehyde cross-linking agent is used for cross-linking the polyacrylamide to form a high-strength three-dimensional space network structure colloid, and the researched key high-temperature stabilizer can effectively inhibit the concentration of high calcium and magnesium ions and the shrinkage dehydration of the jelly in a high-temperature environment, so that the thermal stability of the profile control system is improved. The main agent is selected from nonionic polyacrylamide, the hydrolysis is less, the tackifying efficiency is high, and the temperature resistance and salt tolerance are stronger than those of common anionic polyacrylamide; the cross-linking agent consists of two cross-linking agents of phenols and aldehydes, the two cross-linking agents react at high temperature to generate polymethylol phenol or phenolic resin as the cross-linking agent, and the main agent of the cross-linked polymer forms a network structure; the key high-temperature stabilizer improves the thermal stability of the jelly through two functions, namely, removing oxygen in the solution to inhibit the polyacrylamide from oxidative degradation, and reducing the contact of calcium and magnesium ions in seawater and the polyacrylamide to inhibit the shrinkage and dehydration of the jelly.
The technical scheme of the invention has the following beneficial effects:
1. the seawater-based polyacrylamide high-temperature jelly profile control system provided by the invention can meet the use requirements of seawater sample preparation and a high-temperature environment of 90-130 ℃ in profile control and water shutoff operations of offshore high-temperature oil fields;
2. when the profile control system is used in a stratum, the profile control system preferentially enters a high-permeability layer to form a high-strength non-flowing gel system under an oil reservoir condition, so that the purposes of plugging the high-permeability layer, improving the injection efficiency and increasing the crude oil recovery ratio can be achieved;
3. the profile control system disclosed by the invention has the advantages of long gelling time, high jelly strength, long-term stability for 60 days in a high-temperature environment without damage, and better plugging capability.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 shows the results of the change in elastic modulus of the jelly of example 13 after aging at 120 ℃ for various times under the conditions using a simulated seawater sample preparation;
FIG. 2 is a photograph of the jelly form of example 13 aged for 30 days at 120 ℃ under the condition of using a simulated seawater sample;
FIG. 3 is a photograph of the jelly form of example 13 aged for 60 days at 120 ℃ under the condition of using a simulated seawater sample.
Detailed Description
The seawater-based jelly system can form jelly systems with different gelling time and gelling strength by combining the main agent, the cross-linking agent and the high-temperature stabilizing agent with different concentrations, meets the requirements of different temperature use conditions, and is specifically described below by combining with the embodiment, but not limited thereto.
The relative molecular mass of the nonionic polyacrylamide used in the examples was 1800X 104The high-temperature stabilizer is constructed for laboratory research and water is simulated seawater.
Example 1:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.3g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.3% of high-temperature stabilizer and 98.3% of simulated seawater, wherein the gel has a gel forming time of 26h at 90 ℃ and a gel forming strength of 10200 mPa.
Example 2:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.3g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.3% of high-temperature stabilizer and 98.3% of simulated seawater, and has a gel forming time of 11.5h at 120 ℃ and a gel forming strength of 8620 mPa.
Example 3:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.3g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.3% of high-temperature stabilizer and 98.3% of simulated seawater, and has a gel forming time of 9h at 130 ℃ and a gel forming strength of 7530 mPa.
Example 4:
0.8g of nonionic polyacrylamide, 0.2g of urotropine, 0.3g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.4g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.2% of urotropin, 0.3% of resorcinol, 0.3% of high-temperature stabilizer and 98.4% of simulated seawater, and has a gel forming time of 14h at 120 ℃ and a gel forming strength of 8460 mPa.
Example 5:
0.8g of nonionic polyacrylamide, 0.4g of urotropine, 0.3g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.2g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.4% of urotropin, 0.3% of resorcinol, 0.3% of high-temperature stabilizer and 98.2% of simulated seawater, and has a gel forming time of 10.5h at 120 ℃ and a gel forming strength of 8790 mPa.
Example 6:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.2g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.4g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.2% of resorcinol, 0.3% of a high-temperature stabilizer and 98.4% of simulated seawater, and has a gel forming time of 12.5h at 120 ℃ and a gel forming strength of 8440 mPa.
Example 7:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.4g of resorcinol and 0.3g of high-temperature stabilizer are sequentially added into 98.2g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.4% of resorcinol, 0.3% of a high-temperature stabilizer and 98.2% of simulated seawater, and has a gel forming time of 9h at 120 ℃ and a gel forming strength of 8590 mPa.
Example 8:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.2g of high-temperature stabilizer are sequentially added into 98.4g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.2% of high-temperature stabilizer and 98.4% of simulated seawater, wherein the gel has a gel forming time of 10h at 120 ℃ and a gel forming strength of 8210 mPa.
Example 9:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.4g of high-temperature stabilizer are sequentially added into 98.2g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.4% of high-temperature stabilizer and 98.4% of simulated seawater, and has a gel forming time of 10.5h at 120 ℃ and a gel forming strength of 9060 mPa.
Example 10:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.6g of high-temperature stabilizer are sequentially added into 98.0g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.6% of high-temperature stabilizer and 98.0% of simulated seawater, and has a gel forming time of 10.5h at 120 ℃ and a gel forming strength of 9690 mPa.
Example 11:
0.8g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.8g of high-temperature stabilizer are sequentially added into 97.8g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.8% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.8% of high-temperature stabilizer and 97.8% of simulated seawater, wherein the gel has a gel forming time of 10h at 120 ℃ and a gel forming strength of 10500 mPa.
Example 12:
0.6g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.6g of high-temperature stabilizer are sequentially added into 98.2g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.6% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.6% of high-temperature stabilizer and 98.2% of simulated seawater, and has a gel forming time of 12.5h at 120 ℃ and a gel forming strength of 5980 mPa.
Example 13:
0.4g of nonionic polyacrylamide, 0.3g of urotropine, 0.3g of resorcinol and 0.8g of high-temperature stabilizer are sequentially added into 98.2g of simulated seawater while stirring, and the mixture is continuously stirred until the mixture is uniform, so that the gel forming solution of the profile control system is obtained. The gel comprises, by mass, 0.4% of nonionic polyacrylamide, 0.3% of urotropin, 0.3% of resorcinol, 0.8% of high-temperature stabilizer and 98.2% of simulated seawater, and has a gel forming time of 14h at 120 ℃ and a gel forming strength of 3980 mPa.
Example 14: the temperature resistance and salt tolerance of the profile control system are evaluated by a static simulation method.
The experimental process comprises the following steps: preparing 150mL of gel forming solution, injecting 25mL of gel forming solution into each ampoule bottle, aging for different time at 120 ℃, breaking the upper part of the ampoule bottle, taking out the gel, taking a picture, recording the dehydration rate, and transferring to a rheometer to measure the elastic modulus. The dehydration rate is the ratio of the total volume of the water in the ampoule bottle to the initial volume of the gel forming liquid. The results are shown in Table 1 and FIGS. 1 to 3.
The formula of the profile control system is 0.4 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.8 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
TABLE 1 variation of dehydration Rate for different aging times according to the invention
| Aging time/d | 1 | 10 | 20 | 30 | 45 | 60 |
| Rate of |
0 | 0 | 0 | 2％ | 5％ | 6％ |
Example 15: the plugging capability of the profile control system is evaluated by adopting the artificial rock core, and the residual resistance coefficient of the profile control system after final stabilization is measured.
The experimental process comprises the following steps: carrying out a jelly plugging experiment by using an artificial rock core (with the diameter of 2.5cm and the length of 10.0cm), firstly vacuumizing the rock core, saturating the rock core by using simulated seawater, carrying out primary water drive by using the simulated seawater, recording the change of injection pressure along with the injection volume, and finally setting the pressure stability value as P1(ii) a Then injecting 0.5PV ungelled gel system solution into the rock core, aging at 120 deg.C for different time, performing subsequent water drive, recording injection pressure variation with injection volume, and final pressure stability value is P2. Coefficient of residual resistance FRRThe calculation formula is FRR＝P2/P1The results are shown in Table 2.
The formula of the profile control system is 0.4 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.8 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
TABLE 2 plugging Capacity of the invention
Experimental results show that the seawater-based high-temperature jelly profile control system has strong plugging capability at high temperature, and can achieve the purposes of plugging a high permeability layer and improving the crude oil recovery ratio in the actual profile control.
Claims (10)
1. A seawater-based polyacrylamide high-temperature jelly profile control system is characterized by comprising a main agent, a cross-linking agent, a high-temperature stabilizer and simulated seawater;
the main agent is a polyacrylamide polymer;
the cross-linking agent is an organic phenolic cross-linking agent;
the high-temperature stabilizer is one or a combination of thiourea, amino acid, oxalate, citrate and salicylate.
2. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass:
0.4 to 0.8 percent of main agent;
0.3 to 0.4 percent of cross-linking agent;
0.4 to 0.8 percent of high-temperature stabilizer;
the balance is simulated seawater.
3. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1,
the main agent is nonionic polyacrylamide;
the cross-linking agent is urotropine; the phenolic crosslinking agent is one or a combination of hydroquinone and resorcinol;
simulating total salinity of seawater>30000mg/L，Ca2++Mg2+>1600mg/L。
4. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 3,
the relative molecular mass of the nonionic polyacrylamide is 1800 multiplied by 104(ii) a The simulated seawater ion composition, K++Na+：10686mg/L，Ca2+：439mg/L，Mg2+：1211mg/L，Cl-：19457mg/L，SO4 2-：19457mg/L，HCO3 -：226mg/L，CO3 2-: 0mg/L and total mineralization is 33645 mg/L.
5. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.8 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.4 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
6. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.6 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.6 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
7. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.4 percent of nonionic polyacrylamide, 0.3 percent of urotropine, 0.3 percent of resorcinol, 0.8 percent of high-temperature stabilizer and 98.2 percent of simulated seawater.
8. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.8 percent of nonionic polyacrylamide, 0.4 percent of urotropine, 0.3 percent of resorcinol, 0.4 percent of high-temperature stabilizer and 98.1 percent of simulated seawater.
9. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.6 percent of nonionic polyacrylamide, 0.4 percent of urotropine, 0.3 percent of resorcinol, 0.6 percent of high-temperature stabilizer and 98.1 percent of water.
10. The seawater-based polyacrylamide high-temperature jelly profile control system according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.4 percent of nonionic polyacrylamide, 0.4 percent of urotropine, 0.3 percent of resorcinol, 0.8 percent of high-temperature stabilizer and 98.1 percent of simulated seawater.
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