CN114482912B - Control method for water shutoff agent injection process of horizontal well - Google Patents
Control method for water shutoff agent injection process of horizontal well Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 354
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 197
- 238000002347 injection Methods 0.000 title claims abstract description 188
- 239000007924 injection Substances 0.000 title claims abstract description 188
- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000008569 process Effects 0.000 title claims abstract description 25
- 239000003223 protective agent Substances 0.000 claims abstract description 44
- 235000020681 well water Nutrition 0.000 claims abstract description 14
- 239000002349 well water Substances 0.000 claims abstract description 14
- 230000008901 benefit Effects 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 37
- 230000000903 blocking effect Effects 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 15
- 239000011814 protection agent Substances 0.000 claims description 14
- 239000003129 oil well Substances 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 7
- 238000004886 process control Methods 0.000 claims description 6
- 230000005465 channeling Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 16
- 238000001125 extrusion Methods 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 150000002825 nitriles Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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Abstract
The invention belongs to the technical field of horizontal well development. The invention discloses a control method for a horizontal well water shutoff agent injection process, which comprises the following steps: step 1, designing and selecting a water shutoff combined pipe column according to a water outlet position and a current underground pipe column; step 2, injecting an oil layer protecting agent before injecting the water shutoff agent or injecting the oil layer protecting agent for multiple times before injecting the water shutoff agent and in the water shutoff agent injection process to protect the oil layer; step 3, according to the nature of the water shutoff agent, the pressure of the injected water shutoff agent is optimized and the injection control mode of the water shutoff agent is selected; and 4, optimally selecting an injection mode of the water shutoff agent and the position of the pipe column according to the water outlet of the horizontal well and the position of the well section which is mainly dredged and cleaned. The invention is mainly researched from the aspects of pipe column positioning, oil layer protection, water shutoff agent injection, pollution removal and the like, improves the pertinence, the accuracy and the success rate of water shutoff of the horizontal well, and has the advantages of strong operability, effectiveness, practicability and the like.
Description
Technical Field
The invention relates to the technical field of horizontal well development, in particular to a control method for a horizontal well water shutoff agent injection process.
Background
Horizontal wells are currently widely used in various types of reservoirs as an advanced technique for field development. With the extension of the oil field production time, edge bottom water and the like invade along a high permeability interval or a crack, so that water is discharged from a horizontal well, and even the horizontal well is shut in, and the method becomes one of the problems in the current horizontal well exploitation. Some horizontal well water plugging tests are also carried out in mining fields, but because the water plugging agent injection control process is not in place, oil layer pollution is caused, after water plugging, the problems of poor oil well liquid supply or no oil adding and the like occur, and the further development of the horizontal well water plugging technology is affected. The control method for the injection process of the water shutoff agent of the horizontal well solves the technical problems and improves the water shutoff effect of the horizontal well.
Compared with the method for plugging and controlling the profile of the thermal production horizontal well in the disclosed A1 patent CN201210226837.9, the method is mainly applied to plugging water of the water displacement reservoir horizontal well (casing perforation and screen pipe well completion), and can realize the fixed-point lowering of a plugging pipe column according to the water outlet position and the fixed-point injection of a plugging agent; the oil layer is protected before plugging, so that pollution is avoided; according to the property of the water shutoff agent, intermittent injection is adopted, so that the residence capacity of the water shutoff agent is improved, and the blocking effect of the water shutoff agent is enhanced; and effective blocking removal measures are carried out after blocking, so that the liquid supply capacity after blocking is ensured.
Compared with the method for plugging the bottom water reservoir horizontal well in the published A2 patent CN201610607257.2, the invention is not only applicable to the bottom water reservoir horizontal well, but also applicable to the high water content horizontal well caused by side water or injected water channeling; the A2 patent adopts a general injection mode of the water shutoff agent, and the invention can realize fixed-point lowering of the water shutoff pipe column according to the water outlet position and fixed-point injection of the water shutoff agent; the oil layer is protected before water shutoff, water shutoff agent and protective agent are alternately injected, and the low-permeability oil-containing section is protected by controlling injection displacement and pressure, so that pollution is avoided; according to the property of the water shutoff agent, intermittent injection is adopted, so that the residence capacity of the water shutoff agent is improved, and the blocking effect of the water shutoff agent is enhanced; the blocking removal mode after water blocking adopts a 'replacement extrusion method' mode, so that the blocking removal coverage rate is improved, and the blocking removal effect is improved.
Compared with the published B1 literature 'high water-containing interval water shutoff technology-taking a high-rise oil field high 246-block bottom water reservoir as an example', the method provided by the patent adopts alternate injection of water shutoff agent and protective agent, and shortens the construction time while protecting the oil layer; according to the property of the water shutoff agent, intermittent injection is adopted, so that the residence capacity of the water shutoff agent is improved, and the blocking effect of the water shutoff agent is enhanced; the blocking removal mode after water blocking adopts a 'replacement extrusion method' mode, so that the blocking removal coverage rate is improved, and the blocking removal effect is improved.
Compared with the published B2 literature 'horizontal well fixed-point water plugging technology based on modified cyanide condensation', the method provided by the patent performs oil layer protection before plugging water, and avoids the pollution of a water plugging agent to an oil layer; according to the property of the water shutoff agent, intermittent injection is adopted, so that the residence capacity of the water shutoff agent is improved, and the blocking effect of the water shutoff agent is enhanced; and effective blocking removal measures are carried out after blocking, so that the liquid supply capacity after blocking is ensured.
In the prior art (patent) related to the invention, the key points are the selection of a water shutoff agent system, the optimization of the water shutoff agent dosage and the combination mode, and the like; the lack of an injection site dynamic injection control method influences the water shutoff effect.
Disclosure of Invention
In view of the above, the invention provides a control method for injection process of water shutoff agent of horizontal well for high-water or ultra-high-water development stage of oil extraction of horizontal well of casing perforation hanging-filtering well completion and screen pipe well completion, and improving development effect of horizontal well.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the horizontal well comprises a sleeve perforation hanging-filtering well completion and a large-diameter precise screen pipe well completion horizontal well; the injection process control method comprises four steps:
step 1: lower positioning tubular column
Setting down a water plugging combined pipe column at a fixed point, and designing and selecting the water plugging combined pipe column according to the water outlet position and the current underground pipe column under the condition that the water outlet position is clear;
Step 2: protection of oil-bearing layer
Oil layer protection measures are carried out before water shutoff, and single-time before water shutoff or multi-stage oil layer protection in water shutoff is selected to be adopted according to construction pressure;
step 3: water shutoff agent injection process control
According to the nature of the water shutoff agent and the construction pressure, continuous injection or intermittent injection is selected, so that the resident blocking capacity of the water shutoff agent is improved;
Step4: cleaning a wellbore
According to the water outlet of the horizontal well and the position of the well section which is mainly dredged and cleaned, the injection mode of the plugging removing agent and the position of the pipe column are optimized and selected, and the purpose of efficient and strong control plugging removing is achieved.
The sleeve perforation hanging-filtering well completion means that after the sleeve is put into an oil layer horizontal section for well cementation, perforation is carried out on the oil layer position of the horizontal section, and in order to prevent sand from being discharged, a sand filtering pipe is hung at the perforation position, so that normal production of an oil well is ensured. The large-drift diameter precise sieve tube well completion refers to a well completion mode that a precise sieve tube is connected with a horizontal section of an oil layer under a sleeve, so that a perforation process is omitted, and the sand prevention purpose is achieved.
Preferably, step 1 (fixed-point lowering water shutoff combined pipe column), under the condition that the water outlet position is clear, designing and selecting the water shutoff combined pipe column according to the water outlet position and the current underground pipe column:
① Referring to fig. 1, a casing perforation hanging-filtering well completion adopts a combination of an optical oil pipe and a flushing pipe to go down to a water outlet position (water is discharged near a target point A and water is discharged near a target point B, and then water is discharged near the target point B);
② Referring to fig. 2, the oil production optical oil pipe of the horizontal well completed by the large-drift diameter precise sieve tube is lowered to a water outlet position (water is discharged near the A target point and then lowered to the vicinity of the A target point, water is discharged near the B target point and then lowered to the vicinity of the B target point);
the invention relates to a method for lowering a water shutoff combined pipe column at fixed points according to a water outlet position and a downhole pipe column. The step 1 mainly aims at the problem that the fixed-point injection of the water shutoff agent cannot be realized due to the existence of the sand control pipe column, and the fixed-point injection of the water shutoff agent of the horizontal well with the sand control pipe column is realized by the oil pipe and flushing pipe combined mode.
Preferably, referring to fig. 3, in step 2 (protection of the oil-containing layer), oil pipe or oil pipe+flushing pipe injection is generally adopted, and the oil layer protection agent is injected before the water shutoff agent is injected or the oil layer protection agent is injected for multiple times before and during the water shutoff agent injection process to perform the oil layer protection:
① For wells with smaller dosage of injected water shutoff agent (< 500 square), single oil layer protection is carried out, the oil layer protection agent is injected before the water shutoff agent is injected, namely, the protection agent is injected in a large-displacement mode, the injection pressure is quickly established, the low-permeability layer section or the high-oil-content layer section is protected, the medium-low displacement mode is adopted during the subsequent injection of the water shutoff agent, and the injection pressure is kept to be smaller than the injection pressure during the injection of the protection agent;
② For wells (> 1000 square) with larger dosage of injected water shutoff agent, carrying out multiple oil layer protection, and injecting the oil layer protective agent for multiple times before and during the injection of the water shutoff agent, namely, injecting the protective agent for the first time in a large displacement manner, quickly establishing injection pressure, protecting a low permeability layer section or a high oil-containing layer section, wherein the water shutoff agent is injected for the first time, medium and low displacement is adopted during injection, and the injection pressure is kept smaller than the injection pressure during the first injection of the protective agent; stopping injecting the water shutoff agent when the injection pressure of the first water shutoff agent is close to the pressure of the first oil layer protective agent injection; implementing a second oil injection layer protective agent, namely injecting the protective agent in a large displacement manner, quickly establishing injection pressure, and adopting a medium-low displacement second continuous injection of the water shutoff agent after the injection pressure is greatly improved compared with the pressure at which the first injection of the water shutoff agent is finished, wherein the injection pressure of the water shutoff agent is kept smaller than the injection pressure of the second injection of the protective agent; the above steps are repeated in sequence.
③ For wells (500-1000 square) with moderate dosage of injected water shutoff agent, single oil layer protection is firstly carried out, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of injected protective agent, multiple oil layer protection can be considered;
④ For wells in which the injection of the oil layer protective agent does not raise pressure or does not build protective pressure, it is considered to stop the injection of the protective agent first, change the injection of the water shutoff agent, and inject the oil layer protective agent again after the injection pressure of the water shutoff agent is slightly raised (raised by 2-3 MPa), and the injection pressure of the protective agent is built to protect the low-permeability layer section or the high-oil-content layer section, and then inject the water shutoff agent.
The prior art problem solved by the step 2: in the injection process of the water shutoff agent, the water shutoff agent of the low-permeability oil-containing section and the high-permeability water-containing section enters simultaneously, so that the pollution of the low-permeability oil-containing section is caused, the liquid supply of a horizontal well is insufficient or the horizontal well is blocked after water shutoff, and the water shutoff effect is poor. The invention adopts a multi-stage protection core: the water shutoff agent and the protective agent are alternately injected, and the low-permeability oil-containing section is protected and pollution is avoided by controlling the injection displacement and pressure (the injection pressure of the water shutoff agent is always ensured to be smaller than the injection pressure of the protective agent).
Preferably, referring to fig. 4, in step 3 (water shutoff agent injection process control), oil pipe injection is generally adopted, and according to the nature of the water shutoff agent, the injection control mode of the water shutoff agent is optimally selected according to the pressure of the injected water shutoff agent:
① Intermittent injection: for a horizontal oil well with small pressure rising amplitude and slow rising speed of the injected water shutoff agent, continuous injection, difficult residence, easy channeling, short effective period after plugging and poor water shutoff economic benefit are realized. Intermittent injection (stop-grouting after the end of the No. 1 slug, increase the residence performance of the No. 1 slug, stop-grouting after the end of the No. 2 slug, increase the residence performance of the No. 2 slug, stop-grouting after the end of the No. 3 slug, increase the residence performance of the No. 3 slug), increase the residence performance of the water shutoff agent, increase the plugging surface of the water shutoff agent, and have long effective period after plugging and good economic benefit of water shutoff.
② Continuous injection: for a horizontal oil well with large pressure rising amplitude and high rising speed of the injected water shutoff agent, continuous injection is adopted, so that the migration performance of the water shutoff agent is improved, and meanwhile, the injection displacement of construction and the injection concentration of the water shutoff agent can be reduced.
The prior art problem that step 3 solved: the accumulated oil recovery of the medium-high permeability reservoir is large, the water body is large, the flow blockage and the adjustment and the residence are difficult, and the water blockage effect is poor. The invention adopts a slug combined intermittent injection mode, improves the residence of the water shutoff agent and improves the water shutoff effect.
Step 4 (cleaning the shaft), see fig. 5, according to the water outlet of the horizontal well and the position of the well section which is mainly dredged and cleaned, the injection mode of the water shutoff agent and the position of the pipe column are optimally selected:
① For the horizontal well with water discharged from the A target point, the water plugging pipe column is generally put down to inject the water plugging agent into the A target point, when the water plugging is removed, the water plugging pipe column is put down to the B target point, the sleeve gate is opened, the water plugging removing agent is injected from the oil pipe (positive replacement), and the sleeve gate is closed after the water plugging removing agent covers all horizontal well sections (from the A target point to the B target point); and continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, so as to perform well closing reaction.
② For a horizontal well with water discharged from a B target point, a water shutoff pipe column is generally put into the water shutoff agent at the B target point, when the water shutoff is carried out, the upper body of the water shutoff pipe column is 1-3m above a water outlet interval, a sleeve gate is opened, the water shutoff agent is injected from an oil pipe (positive displacement), and when the water shutoff agent covers the horizontal well above the water outlet interval (A target point is above the water outlet interval), the sleeve gate is closed; and continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, so as to perform well closing reaction.
③ The large-diameter precise sand filtering pipe well completion is constructed by adopting an optical oil pipe, and the sleeve perforation hanging-filtering well completion is constructed by adopting an oil pipe and a flushing pipe.
The prior art problem solved by the step 4: the invention adopts a 'replacement extrusion method' mode to improve the blocking removal coverage rate and the blocking removal effect.
The four steps are performed step by step, each step is required to be in place, otherwise the overall effect is affected.
The control method for the water shutoff agent injection process of the horizontal well disclosed by the invention is mainly used for carrying out absolute control on the aspects of pipe column positioning, oil layer protection, water shutoff agent injection, pollution relief and the like in petroleum mining field test summarization, experience and practice accumulation, improves the pertinence, the accuracy and the success rate of water shutoff of the horizontal well, and has the characteristics of simplicity, strong operability, effectiveness, practicability and the like, so that the control method has good popularization and use values.
Compared with the prior art, the invention has the following beneficial effects:
The invention is obtained by summarizing field application practice, and is different from the existing horizontal well water shutoff theoretical technology. The method is mainly applied to water plugging of the horizontal well in the development stage of high water content or extra high water content of the horizontal well (casing perforation and screen pipe well completion) of the water displacement reservoir, the pertinence and the accuracy of the process are improved, and the water plugging effect of the horizontal well is improved.
The field implementation effect is as follows: the water is filled into GOGD P16 well at 42.7t, the daily oil is filled at 0.4t, the water content is 98.9%, and the liquid level is 633m. 22.1m3 of daily oil after water shutoff, 7.4t of daily oil with the lowest water content of 66.5 percent, 804m of liquid level, 1005 tons of accumulated oil production by stopping (2020.7.10), 905 tons of oil increase and the effective period of 260 days.
Currently, the total number of the horizontal wells in the oil field is 4660, the wells are 3381, wherein the extra-high water-containing well accounts for 49.7 percent (1682) of the number of the wells, the high-efficiency development difficulty is high, the water shutoff treatment requirement of the extra-high water-containing horizontal well is urgent, and the technology has wide application space and social and economic benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a fixed-point drop-in water shutoff combined string (casing perforation hanging-up completion) of the present invention;
FIG. 2 is a schematic diagram of a fixed-point drop-in water shutoff combined string (large-diameter precision sand screen completion) according to the invention;
FIG. 3 is a schematic diagram of the oil layer protection of the present invention;
FIG. 4 is a schematic diagram of the control mode (continuous injection and intermittent injection) of the water shutoff agent injection process of the invention;
FIG. 5 is a schematic view of a clean-up wellbore construction string of the present invention;
FIG. 6 is a graph showing the dynamic profile of GOGD P16 pre-plugging production in accordance with an embodiment of the present invention;
FIG. 7 is a graph showing dynamic curve changes of production before and after GOGD P16 water shutoff in an embodiment of the invention;
FIG. 8 is a graph showing the dynamic production curves before GD1-5P512 water shutoff in an embodiment of the present invention;
FIG. 9 is a graph showing the change of dynamic curves of GD1-5P512 well water shutoff and production before and after water shutoff in the embodiment of the invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a control method for a horizontal well water shutoff agent injection process, which comprises the following steps:
Step 1, designing a water shutoff pipe column and lowering the position of a water shutoff combined pipe column at fixed points according to the water outlet position and the current underground pipe column (figures 1 and 2); ① The sleeve perforation hanging and filtering well completion adopts a combination of an optical oil pipe and a flushing pipe to go down to a water outlet position (water outlet near a target point A is carried out, water outlet near a target point B is carried out, and water outlet near the target point B is carried out; ② The oil production optical oil pipe of the large-drift diameter precise screen pipe well completion horizontal well is lowered to a water outlet position (water is discharged near the A target point and water is discharged near the B target point, and then the water is lowered near the B target point);
Step 2, oil layer protection measures are carried out before water shutoff, and single-time before water shutoff or multi-stage oil layer protection in water shutoff is adopted according to construction pressure (figure 3); ① For wells with smaller dosage of injected water shutoff agent (< 500 square), single oil layer protection is carried out, the oil layer protection agent is injected before the water shutoff agent is injected, namely, the protection agent is injected in a large-displacement mode, the injection pressure is quickly established, the low-permeability layer section or the high-oil-content layer section is protected, the medium-low displacement mode is adopted during the subsequent injection of the water shutoff agent, and the injection pressure is kept to be smaller than the injection pressure during the injection of the protection agent; ② For wells (> 1000 square) with larger dosage of injected water shutoff agent, carrying out multiple oil layer protection, and injecting the oil layer protective agent for multiple times before and during the injection of the water shutoff agent, namely, injecting the protective agent for the first time in a large displacement manner, quickly establishing injection pressure, protecting a low permeability layer section or a high oil-containing layer section, wherein the water shutoff agent is injected for the first time, medium and low displacement is adopted during injection, and the injection pressure is kept smaller than the injection pressure during the first injection of the protective agent; stopping injecting the water shutoff agent when the injection pressure of the first water shutoff agent is close to the pressure of the first oil layer protective agent injection; implementing a second oil injection layer protective agent, namely injecting the protective agent in a large displacement manner, quickly establishing injection pressure, and adopting a medium-low displacement second continuous injection of the water shutoff agent after the injection pressure is greatly improved compared with the pressure at which the first injection of the water shutoff agent is finished, wherein the injection pressure of the water shutoff agent is kept smaller than the injection pressure of the second injection of the protective agent; the above steps are repeated in sequence. ③ For wells (500-1000 square) with moderate dosage of injected water shutoff agent, single oil layer protection is firstly carried out, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of injected protective agent, multiple oil layer protection can be considered; ④ For wells in which the injection of the oil layer protective agent does not raise pressure or does not build protective pressure, it is considered to stop the injection of the protective agent first, change the injection of the water shutoff agent, and inject the oil layer protective agent again after the injection pressure of the water shutoff agent is slightly raised (raised by 2-3 MPa), and the injection pressure of the protective agent is built to protect the low-permeability layer section or the high-oil-content layer section, and then inject the water shutoff agent.
Step 3, according to the nature of the water shutoff agent and the construction pressure, selecting continuous injection or intermittent injection, and improving the residence and blocking capacity of the water shutoff agent (figure 4); ① Intermittent injection: for a horizontal oil well with small pressure rising amplitude and slow rising speed of the injected water shutoff agent, continuous injection, difficult residence, easy channeling, short effective period after plugging and poor water shutoff economic benefit are realized. Intermittent injection (stop-grouting after the end of the No. 1 slug, increase the residence performance of the No. 1 slug, stop-grouting after the end of the No. 2 slug, increase the residence performance of the No. 2 slug, stop-grouting after the end of the No. 3 slug, increase the residence performance of the No. 3 slug), increase the residence performance of the water shutoff agent, increase the plugging surface of the water shutoff agent, and have long effective period after plugging and good economic benefit of water shutoff. ② Continuous injection: for a horizontal oil well with large pressure rising amplitude and high rising speed of the injected water shutoff agent, continuous injection is adopted, so that the migration performance of the water shutoff agent is improved, and meanwhile, the injection displacement of construction and the injection concentration of the water shutoff agent can be reduced.
Step 4, optimizing and selecting the injection mode of the plugging removing agent and the position of the pipe column according to the water outlet of the horizontal well and the position of the well section which is mainly dredged and cleaned, so as to achieve the purpose of high-efficiency and strong-control plugging removal (figure 5): ① For the horizontal well with water discharged from the A target point, the water plugging pipe column is generally put down to inject the water plugging agent into the A target point, when the water plugging is removed, the water plugging pipe column is put down to the B target point, the sleeve gate is opened, the water plugging removing agent is injected from the oil pipe (positive replacement), and the sleeve gate is closed after the water plugging removing agent covers all horizontal well sections (from the A target point to the B target point); continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, and closing the well for reaction; ② For a horizontal well with water discharged from a B target point, a water shutoff pipe column is generally put into the water shutoff agent at the B target point, when the water shutoff is carried out, the upper body of the water shutoff pipe column is 1-3m above a water outlet interval, a sleeve gate is opened, the water shutoff agent is injected from an oil pipe (positive displacement), and when the water shutoff agent covers the horizontal well above the water outlet interval (A target point is above the water outlet interval), the sleeve gate is closed; and continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, so as to perform well closing reaction.
The following are specific examples of applications of the present invention:
specific example 1: GOGD2P16 well water shutoff operation
(1) Basic condition of water-plugging well
Referring to FIG. 6, GOGD2P16 well belongs to sandstone oil reservoir, temperature 65 ℃, mineralization degree 9166mg/L; in 7 months 2018, the initial daily liquid is 22.6m 3/d, the daily oil is 13.8t/d, the water content is 39.1%, the water content is influenced by side water, the water content begins to rise rapidly, the daily liquid is 42.7t/d before water shutoff, the daily oil is 0.4t/d, the water content is 98.9%, and the liquid level is 633m. The well area reserves 7.8 ten thousand tons, the accumulated and collected 0.13 ten thousand tons, and the residual recoverable reserves 2.36 ten thousand tons. The saturation of the remaining oil in the temporary well is as high as 61.8%, which indicates that the well has water shutoff potential.
(2) Water shutoff agent injection process control method and process
A. Fixed-point lowering water plugging combined pipe column
The well is a sleeve perforation hanging-filtering well completion, so that the well water plugging pipe column adopts an oil pipe and flushing pipe combined mode; analyzing that the water outlet point is at the B target point, so that the tail depth of the water shutoff pipe column is lowered to the B target point;
b. Protection of oil layer before and during water shutoff
The well is constructed, the trial injection pressure is 5MPa, the starting pressure is higher, the oil layer protecting agent is injected for the first time, the discharge capacity is 10m 3/h, and the injection pressure is 9.0MPa when the process is finished; firstly injecting the water shutoff agent, stopping injecting the water shutoff agent when the discharge capacity is 6m 3/h and the injection pressure is 8.8 MPa; injecting the oil layer protective agent for the second time, wherein the discharge capacity is 10m 3/h, and the injection pressure is 13.0MPa when the injection is finished; the water shutoff agent is injected for the second time, the discharge capacity is 6m 3/h, the water shutoff agent injection is stopped when the injection pressure is 12.8MPa, the water shutoff agent injection is completed, and the construction requirement is met;
c. Blocking method for improving residence capacity of water shutoff agent by intermittent injection
The well has higher test injection pressure and larger boosting amplitude, and the well is plugged with water in a continuous mode by considering injectability and injectability.
D. Efficient forced control full well section coverage blocking removing process method
The well is a horizontal well for water outlet of a B target point, a water shutoff agent is injected into the B target point below a water shutoff pipe column, when the water shutoff is carried out, the water shutoff pipe column is lifted to the upper part of a water outlet interval by 1-2m, a sleeve gate is opened, the water shutoff agent is injected from an oil pipe (positive displacement), and the sleeve gate is closed after the water shutoff agent covers the horizontal well interval above the water outlet interval (A target point is positioned at the upper part of the water outlet interval); and continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, so as to perform well closing reaction.
(3) Water shutoff effect
Referring to fig. 7, the effect of implementing the water shutoff of the pgd 2p16 well is as follows: the daily liquid before water shutoff is 44.6m 3/d, the daily oil is 0.6t/d at the highest, the water content is 98.7% at the lowest, the liquid level is 633m, the daily liquid after water shutoff is 22.1m 3/d, the daily oil is 7.4t/d at the highest, the water content is 66.5% at the lowest, the liquid level is 804m, the accumulated oil production is 1205 tons, the oil increment is 1005 tons, and the effective period reaches more than 280 days.
Specific example 2: GD1-5P512 well water shutoff operation
(1) Basic condition of water-plugging well
Referring to FIG. 8, GD1-5P512 well is put into production in 2004 for 6 months, the initial day oil capacity is 39.6t/d, the water content is 31.5%, the water content in 2009 for 6 months is increased to more than 90% and is high, the day liquid before water shutoff is 47.5t/d, the day oil is 0.3t, the water content is 99.5%, and the production curve is shown in FIG. 2. According to analysis of dynamic and static oil reservoirs and production wells Shi Ziliao, the heterogeneity contradiction of the horizontal well section of the well is prominent, so that the oil well is high in water content, and the purposes of increasing oil and lowering water are achieved in order to further expand the spread and improve the oil well yield, and GD1-5P512 well water shutoff is specially developed.
(2) Water shutoff agent injection process control method and process
A. Fixed-point lowering water plugging combined pipe column
The well is a sleeve perforation hanging-filtering well completion, so that the well water plugging pipe column adopts an oil pipe and flushing pipe combined mode; analyzing that the water outlet point is at the target point A, so that the tail depth of the water shutoff pipe column is lowered to the target point A;
b. Protection of oil layer before and during water shutoff
The well construction is carried out, the trial injection pressure is 0MPa, the starting pressure is low, the water shutoff agent is injected for the first time, the discharge capacity is 6m 3/h, the water shutoff agent is stopped when the injection pressure is 2.2MPa, the oil layer protecting agent is injected for the first time, the discharge capacity is 10m 3/h, and the injection pressure is 6.5.0MPa when the end is reached; injecting the water shutoff agent for the second time, wherein the discharge capacity is 6m 3/h, when the dosage of the water shutoff agent is 50%, the injection pressure is 3.5MPa, stopping injection, displacing 30m 3, and closing the well for 48 hours; thirdly, injecting the rest 50% of water shutoff agent, wherein the construction pressure is increased to 6.2MPa, and the injection is replaced by 30m 3 to finish the water shutoff agent injection;
c. Blocking method for improving residence capacity of water shutoff agent by intermittent injection
The well test injection pressure is low, and intermittent injection is adopted: injecting the water shutoff agent for the second time, wherein the discharge capacity is 6m 3/h, when the dosage of the water shutoff agent is 50%, the injection pressure is 3.5MPa, stopping injection, displacing 30m 3, and closing the well for 48 hours; the rest 50% of water shutoff agent is injected for the third time, the pressure is increased to 6.2MPa when the construction is finished, the pressure is increased by 2.7MPa, and a better boosting effect is achieved.
D. Efficient forced control full well section coverage blocking removing process method
First blocking removal operation: the well has low test injection pressure and slow boosting amplitude, and the plugging performance and the validity period are considered, so that the well is plugged, and no plugging removal measure is adopted.
And (3) performing second blocking removal operation: the phenomenon of low liquid volume is not caused by plugging after the well is plugged, and secondary plugging removal measures are developed; the well is a horizontal well for water outlet of an A target point, a water shutoff agent is injected into the water shutoff pipe column at the target point, when the water shutoff is carried out, the water shutoff pipe column is lowered to the upper part of the B target point for 1-2m, a sleeve gate is opened, the water shutoff agent is injected from an oil pipe (positive displacement), and the sleeve gate is closed after the water shutoff agent covers a horizontal well section above a water outlet layer section (the B target point is positioned at the upper part of the water outlet layer section); and continuously injecting a plugging removing agent (positive extrusion) from the oil pipe, and injecting a proper amount of displacement liquid after the plugging removing agent is injected, so as to perform well closing reaction.
(3) Water shutoff effect
Referring to FIG. 9, GD1-5P512 well water shutoff implementation: the production is put into production in 6 months of 2004, the initial daily oil capacity is 39.6t, the water content is 31.5%, the water content in 6 months of 2009 rises to more than 90% and is kept high, the daily oil before measures is only 0.3t/d, and the water content is 98.7%; after 2017, the peak daily oil is 7.5t/d, the water content is 75.2% at the minimum, the accumulated oil is increased by 600 tons, and the effective period reaches 390 days.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The control method of the horizontal well water shutoff agent injection process is characterized by comprising the following steps:
step 1: lower positioning tubular column
Setting down a water plugging combined pipe column at a fixed point, and designing and selecting the water plugging combined pipe column according to the water outlet position and the current underground pipe column under the condition that the water outlet position is clear;
Step 2: protection of oil-bearing layer
Oil layer protection measures are carried out before water shutoff, and single-time before water shutoff or multi-stage oil layer protection in water shutoff is selected to be adopted according to construction pressure;
step 3: water shutoff agent injection process control
According to the nature of the water shutoff agent and the construction pressure, continuous injection or intermittent injection is selected, so that the resident blocking capacity of the water shutoff agent is improved;
Step4: cleaning a wellbore
According to the water outlet of the horizontal well and the position of the well section which is mainly dredged and cleaned, the injection mode of the plugging removing agent and the position of the pipe column are optimized and selected, so that the purpose of efficient and strong control plugging removal is achieved;
in the step 2, oil pipe or oil pipe plus flushing pipe is generally adopted for injection, and the oil layer protecting agent is injected before the water shutoff agent is injected or the oil layer protecting agent is injected for multiple times before and during the water shutoff agent injection to protect the oil layer;
In the step 2, for the well with the dosage of the injected water shutoff agent less than 500 square, single oil layer protection is carried out, and the oil layer protection agent is injected before the water shutoff agent is injected, namely, the protection agent is injected in a large displacement mode, the injection pressure is quickly established, the low permeability layer section or the high oil content layer section is protected, the medium-low displacement mode is adopted during the subsequent injection of the water shutoff agent, and the injection pressure is kept to be less than the injection pressure during the injection of the protection agent;
In the step 2, for the well with the dosage of the injected water shutoff agent being more than 1000 square, oil layer protection is carried out for a plurality of times, and the oil layer protection agent is injected for a plurality of times before and during the injection of the water shutoff agent, namely, the protection agent is injected for the first time in a large displacement way, the injection pressure is quickly established, the low permeability layer section or the high oil-containing layer section is protected, the water shutoff agent is injected for the first time, the medium and low displacement is adopted during the injection, and the injection pressure is kept to be smaller than the injection pressure during the injection of the protection agent for the first time; stopping injecting the water shutoff agent when the injection pressure of the first water shutoff agent is close to the pressure of the first oil layer protective agent injection; implementing a second oil injection layer protective agent, namely injecting the protective agent in a large displacement manner, quickly establishing injection pressure, and adopting a medium-low displacement second continuous injection of the water shutoff agent after the injection pressure is greatly improved compared with the pressure at which the first injection of the water shutoff agent is finished, wherein the injection pressure of the water shutoff agent is kept smaller than the injection pressure of the second injection of the protective agent; repeating the steps in sequence;
In the step 2, for the well injected with the water shutoff agent with the dosage of 500-1000 square, single oil layer protection is firstly carried out, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of the injection protective agent, multiple oil layer protection is adopted;
in the step 2, for the well in which the oil layer protective agent is injected without raising pressure or without establishing protective pressure, the injection of the protective agent is stopped, the injection of the water shutoff agent is changed, after the injection pressure of the water shutoff agent is increased by 2-3MPa, the oil layer protective agent is injected again, the injection pressure is established by the injection of the protective agent, the low permeability layer section or the high oil content layer section is protected, and the water shutoff agent is injected later;
In the step 3, oil pipe injection is adopted, and according to the property of the water shutoff agent, the pressure of the water shutoff agent is injected, and the injection control mode of the water shutoff agent is optimally selected;
In the step 3, intermittent injection is performed: for a horizontal oil well with small pressure rise amplitude and slow rise speed of the injected water shutoff agent, continuous injection, difficult residence, easy channeling, short effective period after plugging and poor economic benefit of water shutoff, intermittent injection is adopted, so that the residence performance of the water shutoff agent is improved, the plugging surface of the water shutoff agent is increased, the effective period after plugging is long, and the economic benefit of water shutoff is good;
In the step 3, the following steps are performed: for a horizontal oil well with large pressure rise amplitude and high rise speed of the injected water shutoff agent, continuous injection is adopted, so that the migration performance of the water shutoff agent is improved, and meanwhile, the injection displacement of construction and the injection concentration of the water shutoff agent can be reduced.
2. The method for controlling the injection process of a water shutoff agent for a horizontal well according to claim 1, wherein the horizontal well comprises a sleeve perforation hanging-up completion and a large-drift diameter precise screen well completion horizontal well; the sleeve perforation hanging-filtering well completion means that after the sleeve is put into an oil layer horizontal section for well cementation, perforation is carried out on the oil layer position of the horizontal section, and in order to prevent sand from being discharged, a sand filtering pipe is hung at the perforation position, so that normal production of an oil well is ensured; the large-drift diameter precise sieve tube well completion refers to a well completion mode that a precise sieve tube is connected with a horizontal section of an oil layer under a sleeve, so that a perforation process is omitted, and the sand prevention purpose is achieved.
3. The method for controlling the injection process of the water shutoff agent for the horizontal well according to claim 1, wherein in the step 1, under the condition that the water outlet position is clear, the water shutoff combined pipe column is designed and selected according to the water outlet position and the current underground pipe column: 1) The sleeve perforation hanging-filtering well completion adopts a combination of an optical oil pipe and a flushing pipe to go down to a water outlet position; 2) The large-drift diameter precise screen pipe well completion horizontal well adopts a polished oil pipe to descend to a water outlet position.
4. The method according to claim 1, wherein in the step 4, for a section of the horizontal well near the vertical shaft, the plugging agent is injected into the section of the horizontal well near the vertical shaft under the plugging pipe column, when the plugging is removed, the plugging pipe column is lowered to the end of the section of the horizontal well far from the vertical shaft, the sleeve gate is opened, the plugging removing agent is injected from the oil pipe, and when the plugging removing agent covers all the sections of the horizontal well, the sleeve gate is closed; and continuously injecting a plugging removing agent from the oil pipe, and injecting a displacement liquid after the plugging removing agent is injected, and closing the well.
5. The method for controlling the injection process of the water shutoff agent for the horizontal well according to claim 1, wherein in the step 4, for the horizontal well with water discharged from one end of the horizontal well section far away from the vertical shaft, the water shutoff agent is injected at a water outlet point under the water shutoff pipe column, when the water shutoff is removed, the water shutoff pipe column is lifted to the upper part 1-3m of the water outlet layer section, a sleeve gate is opened, the water shutoff agent is injected from an oil pipe, and the sleeve gate is closed after the water shutoff agent covers the horizontal well section above the water outlet layer section; and continuously injecting a plugging removing agent from the oil pipe, and injecting a displacement liquid after the plugging removing agent is injected, and closing the well.
6. The method according to claim 1, wherein in the step 4, the large-diameter precision sand-filtering pipe completion is constructed by using an optical oil pipe, and the sleeve perforation hanging-filtering completion is constructed by using an oil pipe and a flushing pipe.
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