CN109184615B - Selective water plugging method for oil well of conglomerate oil reservoir and application - Google Patents
Selective water plugging method for oil well of conglomerate oil reservoir and application Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
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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
Abstract
The invention provides a selective water plugging method for a glutenite reservoir oil well and application. The water plugging method comprises the following steps: selecting a water plugging candidate well according to production requirements and the production characteristics of the oil well of the conglomerate reservoir; preparing a selective water plugging agent suitable for a conglomerate oil reservoir; designing a mathematical model according to factors of pores and/or cracks of the oil layer to calculate the using amount of the water shutoff agent; designing a five-section water shutoff agent slug; designing the highest injection pressure value of water plugging according to the stratum fracture pressure; designing the injection displacement of the water shutoff agent according to the stratum permeability and the performance of injection equipment; and injecting a water plugging agent slug into the candidate well for construction water plugging. The method can realize safe operation, general injection, oil increasing and water reducing, provides powerful technical support for water control and oil stabilization of the horizontal well of the oil field in Kunbei of Qinghai, and provides a case for the water plugging process design of the horizontal well of the conglomerate oil reservoir in China.
Description
Technical Field
The invention belongs to the technical field of oil extraction engineering, and relates to a selective water plugging method for a conglomerate oil reservoir oil well and application thereof.
Background
The sea-sea Kunbei conglomerate oil reservoir is formed by deposition of a multi-source braided river, and has the advantages of strong heterogeneity in the plane, interlayer and layer, low natural yield, fast decline, serious water outlet and urgent water control. The Kunbei conglomerate oil reservoir naturally coexists with artificial fractures, the fractures are oil flow channels and water channeling channels, and water control and oil increase are required. The oil well has less test data of the production section, a plurality of water outlet layers, no interlayer between the oil-water layer of the horizontal well and the oil-water layer of the vertical well, and the layered directional water plugging is difficult to implement. The main oil layer has large thickness, long perforation section and large dosage of water shutoff agent. The main force oil area is developed by adopting a superposed horizontal well, the horizontal sections of the upper sub-well and the lower sub-well are short in distance, and flow fields are mutually interfered. The direct injection and horizontal mining result in various injection and mining relations and complex water outlet mechanism. These reservoir and development features make water shutoff design of the kunbei conglomerate reservoir quite difficult.
A design method for selectively plugging water in an oil well of a glutenite reservoir in Kunbei does not exist in China. Based on the characteristics of the conglomerate oil reservoir and the well completion, production and water outlet mechanisms of the oil well, a selective water plugging method for the conglomerate oil reservoir oil well needs to be developed.
The applicant subject group has studied the water plugging technology of horizontal well of Jidong oil field and carried out the test on site, but the Jidong oil field is high-hole high-permeability sandstone oil reservoir, the Qinghai Kunbei belongs to low-permeability micro-crack conglomerate oil reservoir, the characteristics of the oil reservoir are different from those of the oil reservoir tested by Jidong, the Jidong oil field is sand control screen pipe well completion, the Qinghai Kunbei oil field is well cementation perforation well completion, and the two well completion modes are different. There is therefore a need to develop a method for selective water shutoff of an oil well suitable for conglomerate reservoirs.
Disclosure of Invention
In order to solve the problem of the selective water plugging process design of the oil well of the conglomerate oil reservoir, the invention aims to provide a selective water plugging method of the oil well of the conglomerate oil reservoir, the method comprises the steps of selecting and preparing a water plugging agent, designing the using amount of the water plugging agent, designing a water plugging agent segment plug, designing pressure displacement and designing an injection mode, which are integrated, so that the purposes of operation safety, general injection, oil increasing and water reducing are realized, and a technical support suitable for water plugging is provided for the water plugging of the oil well of the conglomerate oil reservoir; the invention also aims to provide the application of the water plugging method in the selective water plugging of the oil well of the conglomerate oil reservoir.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides a selective water plugging method for a glutenite reservoir oil well, which comprises the following steps:
selecting a water plugging candidate well according to production requirements and the production characteristics of the oil well of the conglomerate reservoir;
preparing a selective water plugging agent suitable for a conglomerate oil reservoir;
designing a mathematical model according to factors of pores and/or cracks of the oil layer to calculate the using amount of the water shutoff agent;
designing a five-section water shutoff agent slug;
designing the highest injection pressure value of water plugging according to the stratum fracture pressure;
designing the injection displacement of the water shutoff agent according to the stratum permeability and the performance of injection equipment;
and injecting a water plugging agent slug into the candidate well for construction water plugging.
In the method, the production requirement refers to the water control and oil increasing requirement of oil field exploitation; the production characteristics of the oil well of the conglomerate oil reservoir refer to the characteristics of quick water content rise and high water content of the oil well of the conglomerate oil reservoir; and selecting according to actual operation.
Aiming at the gravel candidate well, the preparation of the acrylamide organic high molecular polymer selective water plugging agent is considered to be suitable for the gravel oil reservoir.
The 'reservoir pore and fracture factors' mainly refer to reservoir pore volume and fracture volume of a candidate well, and because the marmite has micro fractures, the influence factors such as pores, fractures and the like need to be considered.
Due to the complexity and diversity of the porous medium structure of the glutenite stratum, the stratum physical property, the oil well productivity and the water plugging agent performance are needed to design the water plugging agent slug.
The highest injection pressure value of the water shutoff agent is generally smaller than the formation fracture pressure, so the highest injection pressure value of the water shutoff agent needs to be designed according to the size of the formation fracture pressure.
The "injection device performance" mainly refers to the rated displacement of the water shutoff agent injection device. The stratum permeability is high, the rated discharge capacity is large, the stratum permeability is low, and the rated discharge capacity is small; the injection displacement of the water shutoff agent is smaller than the rated displacement, but the water shutoff agent cannot approach the lowest value or the highest value under the normal working state of the equipment; and (4) designing the injection and discharge capacity of the water shutoff agent according to actual operation.
The selective water shutoff of the invention refers to the selectivity of the water shutoff agent to oil, water and oil-water layers, i.e. more water shutoff and less oil shutoff or no oil shutoff.
In the method, the preparation method of the water shutoff agent comprises the following steps:
adding two monomers of acrylic acid and acrylamide into a reaction kettle, stirring and mixing, adding an alkali liquor to adjust the pH value of a solution to be alkalescent, adding two monomers of 2-acrylamido-2-methylpropanesulfonic acid and dimethyldiallylammonium chloride into the reaction kettle, heating in a water bath, and stirring and mixing uniformly;
step two, introducing nitrogen for protection, and dropwise adding N, N-methylene bisacrylamide into the reaction kettle while stirring for crosslinking reaction;
and step three, adding sodium bisulfite into the reaction kettle while stirring after the crosslinking reaction is finished, then adding ammonium sulfate and/or potassium persulfate, heating in a water bath to carry out polymerization reaction until the mixture is gelatinized, and obtaining gelatinized particles, namely the water plugging agent.
In the above method, preferably, the molar ratio of the acrylic acid, the acrylamide, the 2-acrylamido-2-methylpropanesulfonic acid, and the dimethyldiallylammonium chloride is (0.8-1.2): (0.2-0.3): (0.4-0.6); further preferably, the molar ratio of the acrylic acid, the acrylamide, the 2-acrylamido-2-methylpropanesulfonic acid, and the dimethyldiallylammonium chloride is 1:1:0.26: 0.46.
The alkali liquor comprises a solution of sodium hydroxide and/or sodium carbonate; preferably, the concentration of sodium hydroxide is 1%. In the first step, the alkali liquor is used for adjusting the pH value of the solution to 8; the concentration of the N, N-methylene-bisacrylamide is 0.5%. The amount of the N, N-methylene bisacrylamide is 0.1% of the total amount of the monomers based on the mass of the N, N-methylene bisacrylamide. The concentration of the ammonium persulfate is 1 percent; and the using amount of the ammonium persulfate is 0.3 percent of the total amount of the monomers by mass. The concentration of the sodium bisulfite is 0.6%. The amount of the sodium bisulfite is 0.13% of the total amount of the monomers based on the mass of the sodium bisulfite. In the first step, the temperature of water bath heating is 25-35 ℃; the stirring time is 20-30 min. In the third step, the temperature of the water bath is increased to 45-55 ℃; the reaction time is 10-15 min. The total monomer amount refers to the total mass of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and dimethyldiallylammonium chloride.
In the above method, preferably, the amount of the water shutoff agent is calculated according to the following mathematical model formula:
V2＝2.6LhWf
V3＝V1+V2
wherein, V1In order to take into account the volume of the plugging agent in the pores of the reservoir, m3；V2Volume of water shutoff agent to account for cracking, m3；V3Volume of water shutoff agent for simultaneous consideration of reservoir pore and fracture m3(ii) a a is the depth of the water shutoff agent, m; b is the length of a horizontal well production section m; c is the oil layer thickness, m; h is the height of the micro-cracks of the oil layer, m; l is the half-length of the microcrack, m; wfM is the width of the microcrack; alpha is the specific surface coefficient of water production, decimal;
is the formation porosity, decimal.
Since the margarite in Kunbei has micro cracks, a mathematical model of the amount of micro crack variable correction is required to be established.
In the above method, preferably, the five-stage water shutoff agent slug sequentially includes a pretreatment slug, a polymer adsorption slug, a low-strength slug, a high-strength slug and a post-treatment slug. These slugs and their order are designed according to the formation physical properties and the physicochemical effects of the individual slugs.
In the above method, preferably, the pretreated slug is selected from any one of oilfield clean water, low-concentration polyacrylamide solution or ammonium salt anti-swelling agent (one of them is selected according to reservoir properties).
In the above method, preferably, the concentration of the low-concentration polyacrylamide solution is less than 0.15%.
In the above method, preferably, the polymeric adsorbent plug is a quaternary ammonium salt cationic surfactant.
In the above method, preferably, the low-strength slug and the high-strength slug are the above selective water plugging agent for preparing a conglomerate oil reservoir, wherein the high-strength slug is a large-particle slug with a particle size of more than 600 μm; the low-strength slug is a small-particle slug with the particle size of less than or equal to 600 mu m.
In the above method, preferably, the post-treatment slug is a high-concentration polyacrylamide solution.
In the above method, preferably, the concentration of the high-concentration polyacrylamide solution is greater than 0.15%.
In the method, preferably, the maximum injection pressure value of the water shutoff agent is controlled to be not more than 85% of the fracture pressure of the stratum.
In the above method, preferably, the injection displacement of the water shutoff agent is controlled to be 3-5m3/h。
In the above method, preferably, the concrete method for injecting the water shutoff agent slug to perform construction water shutoff is:
according to the sequence of the water plugging agent slug, a pretreatment slug, a high molecular adsorption slug, a low strength slug, a high strength slug and a post-treatment slug are injected in sequence, and finally, a displacement liquid is injected, and after the injection is finished, a pump is stopped to measure the pressure drop after water plugging.
In the above method, preferably, the dosage ratio of the pretreatment slug, the polymer adsorption slug, the low-strength slug and the high-strength slug is (8-10): 30-40): (40-50): (30-40): (8-10).
In the above method, preferably, the injection of the water shutoff agent slug is performed by three injection methods, including: the injection mode of the light oil pipe injection string without a downhole tool (light oil pipe) is characterized in that an original production string cannot be taken out, and the injection mode of the upper sleeve injection string is protected by an upper clamp packer of an oil layer (top clamp seal) from an oil sleeve annulus injection mode (immobile string) and part of oil wells with poor well conditions. The three column injection modes have the advantages of simple process, safe operation, short operation time, low action cost and the like.
In the method, preferably, the steps of sand washing, well dredging, pressure testing and leakage finding are further included before the water plugging agent slug is injected for construction and water plugging.
In another aspect, the invention also provides the use of the above method for selective water shutoff in a conglomerate reservoir oil well.
The method is used for the field water plugging test and the popularization and application of 9 wells in the Kunbei conglomerate oil reservoir of the Qinghai oilfield, the effective rate is 100 percent, the accumulated oil increment is 3951 tons, the precipitation is 3.01 ten thousand, the economic benefit is 1022 ten thousand yuan, and the input-output ratio is 1: 3.29. the invention provides powerful technical support for water control and oil stabilization of the horizontal well of the oil field in Kunbei of Qinghai, and provides an example for the design of a water plugging process of the horizontal well of the oil reservoir in the gravels at home.
The invention aims at the water plugging method which integrates the selection preparation of the water plugging agent, the design of the using amount of the water plugging agent, the design of the slug of the water plugging agent, the design of the pressure discharge capacity and the design of the injection mode of the oil well of the gravel rock oil reservoir, realizes the purposes of safe operation, general injection and oil and water increasing, and also provides technical support suitable for water plugging for the water plugging of the oil well of the gravel rock oil reservoir.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Examples
12 well areas A of the Qinghai Kunbei oilfield are cut, the production is carried out in 4 months in 2012, the daily liquid production in the initial stage is 5.10 tons, the daily oil production is 4.96 tons, and the water content is 2.7 percent. Before 5 months of water plugging in 2016, the well produces 14.5 tons of daily liquid, 1.0 ton of daily oil and 92.8 percent of water. Development requires the implementation of chemical water shutoff to control water cut and increase single well production.
And selective water shutoff is carried out in 2016, 5 months, 12 days to 16 days. According to the design method of the invention, the specific water plugging method comprises the following steps:
s101, well selection: selecting a water plugging candidate well according to the production requirements of an oil field geological development department and the production characteristics of a conglomerate oil reservoir oil well;
s102, selecting a preparation: according to the temperature (70 ℃) of an oil reservoir where the candidate well is positioned, the mineralization degree (60000mg/L) and the reservoir permeability (average 24 multiplied by 10)-3μm2) Oil well fluid production capacity (average 15 m)3D), preparing a selective water shutoff agent suitable for the conglomerate oil reservoir; the water shutoff agent is prepared from acrylamide organic high molecular polymers by the following steps:
(1) adding 3.312g of acrylic acid and 3.266g of acrylamide into a reaction kettle, stirring and mixing, then adding 30% NaOH solution to adjust the pH value of the solution to 8, then adding 2.486g of 2-acrylamide-2-methylpropanesulfonic acid and 3.440g of dimethyl diallyl ammonium chloride into the reaction kettle, heating in a water bath at 30 ℃, stirring and mixing uniformly;
(2) introducing nitrogen for protection, dropwise adding an N, N-methylene bisacrylamide solution (the mass of N, N-methylene bisacrylamide is 0.013g, the mass of water is 2.587g) with the concentration of 0.5% into the reaction kettle while stirring, and carrying out crosslinking reaction;
(3) after the crosslinking reaction is finished, adding NaHSO with the concentration of 0.6 percent into the reaction kettle while stirring3Solution (NaHSO)30.017g of water and 2.816g of water, and then 1 percent of initiator (NH) is added4)2S2O8Solution ((NH)4)2S2O80.038g of water and 3.762g of water), and heating to 50 ℃ in a water bath for polymerization reaction until the mixture is gelatinized to obtain gelatinized particles, namely the water plugging agent.
S103, designing the dosage of the water shutoff agent: designing a mathematical model according to factors of pores and/or cracks to calculate the dosage of the water shutoff agent, and specifically calculating the dosage of the water shutoff agent by adopting the following mathematical model formula:
V2＝2.6LhWf
V3＝V1+V2
wherein, V1In order to take into account the volume of the plugging agent in the pores of the reservoir, m3；V2Volume of water shutoff agent to account for cracking, m3；V3Volume of water shutoff agent for simultaneous consideration of reservoir pore and fracture m3(ii) a a is the depth of the water shutoff agent, m; b is the length of a horizontal well production section m; c is the oil layer thickness, m; h is the height of the micro-cracks of the oil layer, m; l is the half-length of the microcrack, m; wfM is the width of the microcrack; alpha is the specific surface coefficient of water production, decimal;
is the formation porosity.
In particular, for well A, a is 20m, b is 132m, c is 10m, h is 10m, L is 20m, W is the well candidate of this embodimentfIs 1 × 10-4m, alpha are 0.1,
is 0.1. V is calculated according to the formula3About 265 squares; therefore, the dosage of the water shutoff agent is designed to be 265 square.
S104, slug design: designing a water shutoff agent slug and the volume according to the physical properties of the stratum, the productivity of the oil well and the performance of the water shutoff agent; the slug of this embodiment adopts five slug type designs, includes pretreatment slug, polymer adsorption slug, low strength slug, high strength slug and aftertreatment slug in proper order.
S105, pressure design: designing the highest injection pressure value of water plugging according to the stratum fracture pressure; the value is generally not more than 85% of the fracture pressure of the stratum, and the highest injection pressure value of the water plugging at the well A position in the implementation is set to be 20 MPa.
S106, displacement design: according to the A well formation permeability (35X 10)-3μm2) And injection device performance (rated displacement 8 m)3H), designing the injection discharge capacity of the water shutoff agent, and generally requiring 3-5m3The discharge capacity of the water shutoff agent in the embodiment is set to 4m3/h。
And S107, injecting a water plugging agent slug into the candidate well for construction water plugging. The method specifically comprises the following steps (taking the water plugging construction of a horizontal well A in the Qinghai oilfield as an example):
and (5) pulling out the original well production pipe column, and punching sand from the lower sand punching pipe column to the bottom of the artificial well.
Dredging a well: and (5) pulling out the exploration sand washing pipe column, and leading the lower phi 114mm drift gauge to the bottom of the artificial well.
Pressure testing and leakage finding: and the PT packer with the lower phi of 114mm tests the pressure of the casing pipe above the oil layer by 30MPa, the pressure drop is less than 0.5MPa after 10min, and the next procedure can be carried out after the pressure test is qualified. If the sleeve has no leak point, the water plugging pipe column is put down, the position of the guide cone is 2370m, if the sleeve has the leak point, the water plugging pipe column with the top seal is put down to the 350-shaped well mouth, the pressure test of the well mouth is 30MPa, and the water plugging pipe column is qualified without puncture and leakage. Reverse well washing, liquid return 15m3And observing the condition of the returned liquid.
And connecting a ground flow, testing the equipment, testing the pressure of the pipeline under 30MPa without puncture and leakage under the condition of safety confirmation, and performing the next procedure after the pipeline is qualified by inspection of supervisors.
Closing the casing gate at 6m3The volume of the discharged water is 20m3. And measuring the stratum absorption amount, and recording the injection pressure and the injection amount. And stopping the pump after the injection to measure the pressure drop before water plugging. If the pressure is normal, the following steps are carried out.
According to the slug program and design dosage, 4m3Per hour displacement injection pretreatment slug (low concentration polyacrylamide solution, concentration 0.12%)3Polymeric adsorbent slug (quaternary ammonium salt cationic surfactant) 80m3Low strength slug 100m3High strength slug 85m3Post-treatment slug (high-strength polyacrylamide solution, 0.2% strength) 20m3Finally, 20m of displacing liquid is injected3. And after the pump is stopped and the water is blocked, the pressure drop is measured.(Explanation: the volume of the slug including the water shutoff part in the 265 th place, excluding the pre-treatment slug and the post-treatment slug)
And closing the well for 48h, and recording the pressure of the oil and the casing at the well head every 2 h. Deepening the pipe column, backwashing to the bottom of the artificial well, and backwashing for 30m3Observing well washing pressure and liquid return conditions; pulling out the chemical plugging tubular column; and (5) lowering the production string.
After the method is adopted for water plugging, the daily produced liquid of the well is 4 tons, the daily produced oil is 3.6 tons, and the water content is 10 percent. The effective period is 550 days, and the remarkable effect is achieved.
The method is used for the field water plugging test and the popularization and application of 9 wells in the Kunbei conglomerate oil reservoir of the Qinghai oilfield, the effective rate is 100 percent, the accumulated oil increment is 3951 tons, the precipitation is 3.01 ten thousand, the economic benefit is 1022 ten thousand yuan, and the input-output ratio is 1: 3.29. the invention provides powerful technical support for water control and oil stabilization of the horizontal well of the oil field in Kunbei of Qinghai, and provides an example for the design of a water plugging process of the horizontal well of the oil reservoir in the gravels at home.
Claims (10)
1. A selective water plugging method for an oil well of a conglomerate oil reservoir comprises the following steps:
selecting a water plugging candidate well according to production requirements and the production characteristics of the oil well of the conglomerate reservoir;
preparing a selective water plugging agent suitable for a conglomerate oil reservoir;
designing a mathematical model according to factors of pores and/or cracks of the oil layer to calculate the using amount of the water shutoff agent;
designing a five-section water shutoff agent slug;
designing the highest injection pressure value of water plugging according to the stratum fracture pressure;
designing the injection displacement of the water shutoff agent according to the stratum permeability and the performance of injection equipment;
injecting a water plugging agent slug into the candidate well for construction water plugging;
the preparation method of the water shutoff agent comprises the following steps:
adding two monomers of acrylic acid and acrylamide into a reaction kettle, stirring and mixing, adding an alkali liquor to adjust the pH value of a solution to be alkalescent, adding two monomers of 2-acrylamido-2-methylpropanesulfonic acid and dimethyldiallylammonium chloride into the reaction kettle, heating in a water bath, and stirring and mixing uniformly;
step two, introducing nitrogen for protection, and dropwise adding N, N-methylene bisacrylamide into the reaction kettle while stirring for crosslinking reaction;
step three, adding sodium bisulfite into the reaction kettle while stirring after the crosslinking reaction is finished, then adding ammonium sulfate and/or potassium persulfate, heating in a water bath to carry out polymerization reaction until the mixture is gelatinized, and obtaining gelatinized particles, namely the water plugging agent;
calculating the dosage of the water plugging agent according to the following mathematical model formula:
wherein, V1In order to take into account the volume of the plugging agent in the pores of the reservoir, m3；V2Volume of water shutoff agent to account for cracking, m3；V3Volume of water shutoff agent for simultaneous consideration of reservoir pore and fracture m3(ii) a a is the depth of the water shutoff agent, m; b is the length of a horizontal well production section m; c is the oil layer thickness, m; h is the height of the micro-cracks of the oil layer, m; l is the half-length of the microcrack, m; wfM is the width of the microcrack; alpha is the specific surface coefficient of water production, decimal; phi is the formation porosity, decimal;
the five-section type water shutoff agent slug sequentially comprises a pretreatment slug, a polymer adsorption slug, a low-strength slug, a high-strength slug and a post-treatment slug;
the pretreatment slug is selected from any one of clean water of an oil field, a low-concentration polyacrylamide solution or an ammonium salt anti-swelling agent;
the polymer adsorption slug is quaternary ammonium salt cationic surfactant;
the low-strength slug and the high-strength slug are the selective water plugging agent suitable for the conglomerate oil reservoir, wherein the high-strength slug is a large-particle slug with the particle size larger than 600 mu m; the low-strength slug is a small-particle slug with the particle size of less than or equal to 600 mu m;
the post-treatment slug is a high concentration polyacrylamide solution.
2. The method of claim 1, wherein: the concentration of the low-concentration polyacrylamide solution is less than 0.15%.
3. The method of claim 1, wherein: the concentration of the high-concentration polyacrylamide solution is more than 0.15 percent.
4. The method of claim 1, wherein: and the highest injection pressure value of the water shutoff agent is controlled to be not more than 85% of the fracture pressure of the stratum.
5. The method of claim 1, wherein: the injection displacement of the water shutoff agent is controlled to be 3-5m3/h。
6. The method according to claim 1, wherein the concrete method for plugging water by injecting the plugging agent slug for construction is as follows:
according to the sequence of the water plugging agent slug, a pretreatment slug, a high molecular adsorption slug, a low strength slug, a high strength slug and a post-treatment slug are injected in sequence, and finally, a displacement liquid is injected, and after the injection is finished, a pump is stopped to measure the pressure drop after water plugging.
7. The method of claim 6, wherein: the dosage ratio of the pretreatment slug, the macromolecule adsorption slug, the low-strength slug, the high-strength slug and the post-treatment slug is (8-10): 30-40): 40-50: (30-40): 8-10.
8. The method of claim 6, wherein the plugging agent slug is injected using three injection modes comprising: a light oil pipe injection string injection mode without a downhole tool; injecting the oil from the oil sleeve annulus without taking out the original production string; and in a part of oil wells with poor well conditions, an upper clamp packer of an oil layer is adopted to protect an upper sleeve pipe and inject the oil into a pipe column.
9. The method of claim 6, wherein the steps of sand washing, well dredging, pressure testing and leakage finding are further included before the water shutoff agent slug is injected for construction and water shutoff.
10. Use of a method according to any one of claims 1 to 9 for the selective water shutoff of a conglomerate reservoir oil well.
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| CN110805408B (en) * | 2019-05-31 | 2021-08-31 | 大港油田集团有限责任公司 | Profile control process method for water injection well with packer pipe column |
| CN112814618A (en) * | 2019-11-18 | 2021-05-18 | 中国石油天然气股份有限公司 | Selective chemical water plugging method |
| CN111577231A (en) * | 2020-05-14 | 2020-08-25 | 中国石油天然气股份有限公司 | Method for improving water plugging effect of flooded oil well through reverse profile control and flooding |
| CN113027433B (en) * | 2021-03-24 | 2023-08-22 | 中国石油天然气股份有限公司 | Method and apparatus for calculating permeability of strongly heterogeneous sandstone reservoir |
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