CN114482912A - Horizontal well water shutoff agent injection process control method - Google Patents
Horizontal well water shutoff agent injection process control method Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 187
- 239000007924 injection Substances 0.000 title claims abstract description 187
- 238000000034 method Methods 0.000 title claims abstract description 63
- 235000020681 well water Nutrition 0.000 title claims abstract description 28
- 239000002349 well water Substances 0.000 title claims abstract description 28
- 238000004886 process control Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 342
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- 238000010276 construction Methods 0.000 claims description 20
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Abstract
The invention belongs to the technical field of horizontal well development. The invention discloses a horizontal well water shutoff agent injection process control method, which comprises the following steps: step 1, designing and selecting a water plugging combined pipe column according to a water outlet position and a current underground pipe column; step 2, injecting an oil layer protective agent before injecting the water plugging agent or injecting the oil layer protective agent for multiple times before injecting the water plugging agent and in the process of injecting the water plugging agent to carry out oil layer protection; step 3, according to the properties of the water shutoff agent, the pressure of the injected water shutoff agent, and the injection control mode of the water shutoff agent is optimally selected; and 4, optimally selecting the injection mode of the plugging removal agent and the position of the pipe column according to the outlet water of the horizontal well and the position of the well section which is mainly dredged and cleaned. The method is mainly researched from the aspects of pipe column positioning, oil layer protection, water shutoff agent injection, pollution relief 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 horizontal well water shutoff agent injection process control method.
Background
Horizontal wells are used as an advanced technology for oil and gas field development and are widely applied to various types of oil and gas reservoirs at present. Along with the extension of the production time of the oil field, edge bottom water and the like invade along a high-permeability interval or a crack, so that the water outlet of the horizontal well is caused, even the well is closed, 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 mines, but because the injection control process of the water plugging agent is not in place, oil layer pollution is caused, and after water plugging, the problems of poor oil well liquid supply or no oil increase and the like occur, so that the further development of the horizontal well water plugging technology is influenced. Therefore, the injection process control method for the horizontal well water shutoff agent is invented, the technical problems are solved, and the water shutoff effect of the horizontal well is improved.
Compared with the method for water shutoff and profile control of a thermal recovery horizontal well in the patent A1, CN201210226837.9 and the invention is mainly applied to water shutoff of a water drive reservoir horizontal well (casing perforation and screen pipe well completion), and can realize fixed-point lowering of a water shutoff pipe column according to a water outlet position and fixed-point injection of a water shutoff agent; before plugging, oil layer protection is carried out, and pollution is avoided; according to the properties of the water shutoff agent, intermittent injection is adopted, so that the retention capacity of the water shutoff agent is improved, and the plugging effect of the water shutoff agent is enhanced; and after the blockage, effective blockage removal measures are carried out, so that the liquid supply capacity after the blockage is ensured.
Compared with the published patent A2 'CN 201610607257.2, a method for blocking water of a bottom water reservoir horizontal well', the method is not only suitable for the bottom water reservoir horizontal well, but also suitable for a high water-cut horizontal well caused by side water or injected water channeling; the patent A2 adopts a general injection mode of the water shutoff agent, and the invention can realize the fixed-point downward placement of the water shutoff tubular column according to the water outlet position and realize the fixed-point injection of the water shutoff agent; before water plugging, oil layer protection is carried out, a water plugging agent and a protective agent are injected alternately, and a low-permeability oil-containing section is protected by controlling injection discharge capacity and pressure, so that pollution is avoided; according to the properties of the water shutoff agent, intermittent injection is adopted, so that the retention capacity of the water shutoff agent is improved, and the plugging effect of the water shutoff agent is enhanced; the blockage removal mode after water blockage adopts a 'displacement extrusion method', so that the blockage removal coverage rate is improved, and the blockage removal effect is improved.
Compared with the published B1 document 'water shutoff technology of high water-containing intervals-taking a high-rise oil field and 246 bottom water reservoirs as an example', the method provided by the patent adopts the alternate injection of the water shutoff agent and the protective agent, so that the construction time is shortened while the oil layer is protected; according to the properties of the water shutoff agent, intermittent injection is adopted, so that the retention capacity of the water shutoff agent is improved, and the plugging effect of the water shutoff agent is enhanced; the blockage removal mode after water blockage adopts a 'displacement extrusion method', so that the blockage removal coverage rate is improved, and the blockage removal effect is improved.
Compared with the published B2 document 'horizontal well fixed-point water plugging technology based on modified cyanogen coagulation', the method provided by the patent protects an oil layer before water plugging, and avoids a water plugging agent from polluting the oil layer; according to the properties of the water shutoff agent, intermittent injection is adopted, so that the retention capacity of the water shutoff agent is improved, and the plugging effect of the water shutoff agent is enhanced; and after the blockage, effective blockage removal measures are carried out, so that the liquid supply capacity after the blockage is ensured.
The prior art (patent) related to the invention focuses on the aspects of selection of a water shutoff agent system, optimization of the dosage of the water shutoff agent, combination mode and the like; and the water plugging effect is influenced due to the lack of a dynamic injection control method in an injection site.
Disclosure of Invention
In view of the above, the invention provides a control method for an injection process of a horizontal well water shutoff agent, which is used in a high-water-cut or ultra-high-water-cut development stage of casing perforation, filter-hanging completion and screen pipe completion horizontal well oil production and improves the development effect of a horizontal well.
In order to achieve the purpose, the invention adopts the following technical scheme:
a horizontal well water shutoff agent injection process control method is disclosed, wherein the horizontal well comprises a casing perforation filter-hanging well completion and a large-drift-diameter precision sieve tube well completion horizontal well; the injection process control method comprises four steps:
step 1: lower positioning pipe column
A water plugging combined pipe column is placed at a fixed point, and under the condition that the water outlet position is clear, the water plugging combined pipe column is designed and selected according to the water outlet position and the current underground pipe column;
step 2: protecting oil-bearing formations
Performing oil layer protection measures before water plugging, and selecting single time or multi-stage oil layer protection in water plugging according to construction pressure;
and step 3: water shutoff agent injection process control
Continuous injection or intermittent injection is selected according to the properties of the water plugging agent and the construction pressure, so that the resident plugging capability of the water plugging agent is improved;
and 4, step 4: cleaning a wellbore
According to the outlet water of the horizontal well and the position of the well section which is mainly dredged and cleaned, the injection mode of the plugging removal agent and the position of the pipe column are optimized and selected, and the purpose of high-efficiency strong-control plugging removal is achieved.
The casing perforation filtration hanging well completion refers to that after a casing is put into a horizontal section of an oil layer for well cementation, perforation is carried out on the position of the oil layer of the horizontal section, and in order to prevent sand production, a sand filtration pipe is hung at the perforation position, so that the normal production of an oil well is guaranteed. The large-drift-diameter precision sieve tube well completion means that after the precision sieve tube is connected to the horizontal section of the oil layer under the sleeve, a perforation process is omitted, and a well completion mode for preventing sand is achieved.
Preferably, step 1 (fixed point lowering water shutoff combined pipe column), under the definite circumstances of water outlet position, according to water outlet position and present well tubular column, design and select water shutoff combined pipe column:
firstly, referring to fig. 1, the casing perforation, hanging filtration and well completion adopts the combination of the optical oil pipe and the flushing pipe to go down to a water outlet position (water is discharged near the target point A, and then is discharged near the target point A, and water is discharged near the target point B, and then is discharged near the target point B);
secondly, referring to fig. 2, the oil extraction optical oil pipe of the large-drift-diameter precision screen pipe well completion horizontal well is lowered to a water outlet position (water is discharged near the target point A, and then is lowered to the vicinity of the target point A, and water is discharged near the target point B, and then is lowered to the vicinity of the target point B);
the invention relates to a method for lowering a water plugging combined pipe column at a fixed point 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 washing pipe combined mode.
Preferably, referring to fig. 3, in step 2 (protecting the oil-bearing layer), oil pipe or oil pipe + pipe flushing injection is generally adopted, and before injecting the water shutoff agent, an oil layer protective agent is injected, or before injecting the water shutoff agent and during injecting the water shutoff agent, oil layer protection is performed by injecting the oil layer protective agent for multiple times:
firstly, performing single oil layer protection on a well (less than 500) with a small injection water shutoff agent dosage, injecting an oil layer protective agent before injecting the water shutoff agent, namely injecting the protective agent with large discharge capacity, quickly establishing injection pressure to protect a low-permeability layer section or a high-oil layer section, adopting medium and low discharge capacity when injecting the water shutoff agent subsequently, and keeping the injection pressure to be less than the injection pressure when injecting the protective agent;
secondly, for wells (more than 1000 square) with large injection amount of the water shutoff agent, performing oil layer protection for multiple times, injecting the oil layer protective agent for multiple times before and in the process of injecting the water shutoff agent, namely injecting the protective agent with the first large displacement, quickly establishing injection pressure to protect a low-permeability layer section or a high-oil-content layer section, injecting the water shutoff agent for the first time, wherein the injection pressure is kept to be smaller than that of the protective agent for the first time by adopting medium and low displacement during injection; stopping injecting the water shutoff agent when the injection pressure of the first water shutoff agent is close to the pressure of the protective agent of the first oil injection layer; implementing a second oil layer injection protective agent, namely injecting the protective agent with large discharge capacity, quickly establishing injection pressure, and after the injection pressure is greatly improved compared with the pressure at the end of the first water plugging agent injection, adopting middle-low discharge capacity to continuously inject the water plugging agent for the second time, wherein the injection pressure of the water plugging agent is kept to be smaller than that of the protective agent injected for the second time; and repeating the steps in sequence.
For the well (500 plus 1000 sides) with proper water shutoff agent injection dosage, firstly, single oil layer protection is carried out, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of the protective agent injection, multiple times of oil layer protection can be considered;
and fourthly, for the well injected with the oil layer protective agent without pressure rise or protective pressure establishment, stopping injecting the protective agent, changing to inject the water shutoff agent, injecting the oil layer protective agent after the injection pressure of the water shutoff agent is slightly increased (increased by 2-3MPa), establishing the injection pressure of the protective agent, protecting the low-permeability layer section or the high-oil-content layer section, and injecting the water shutoff agent subsequently.
The prior art problem solved by the step 2 is as follows: 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 to cause pollution of the low-permeability oil-containing section, and the liquid supply of the horizontal well is insufficient or blocked after water shutoff to cause poor water shutoff effect. 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 by controlling the injection discharge capacity and the pressure (always ensuring that the injection pressure of the water shutoff agent is less than that of the protective agent), so that pollution is avoided.
Preferably, referring to fig. 4, in step 3 (water shutoff agent injection process control), oil pipe injection is generally adopted, and the injection control mode of the water shutoff agent is optimally selected according to the water shutoff agent property and the pressure of the injected water shutoff agent:
firstly, intermittent injection: for a horizontal oil well injected with the water shutoff agent, which has small pressure rise amplitude and low rise speed, continuous injection, difficult residence, easy channeling, short effective period after plugging and poor water shutoff economic benefit. Intermittent injection (firstly, after the section plug No. 1 is injected, the well is shut down for waiting coagulation to improve the residence performance of the section plug No. 1, then, after the section plug No. 2 is injected, the well is shut down for waiting coagulation to improve the residence performance of the section plug No. 2, and finally, after the section plug No. 3 is injected, the well is shut down for waiting coagulation to improve the residence performance of the section plug No. 3) is adopted, the residence performance of the water plugging agent is improved, the plugging surface of the water plugging agent is increased, the effective period is long after plugging, and the water plugging economic benefit is good.
Continuous injection: for a horizontal oil well with large pressure rise range 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 construction injection displacement and the injection concentration of the water shutoff agent are reduced.
The prior art problem solved in step 3 is as follows: the accumulated oil production of the medium-high permeability reservoir is large, the water body is large, the blockage and the adjustment of channeling are difficult, the retention is difficult, and the water plugging effect is poor. The invention adopts a slug combined intermittent injection mode, improves the retention of the water plugging agent and improves the water plugging effect.
Step 4 (cleaning the shaft), referring to fig. 5, optimizing and selecting the injection mode of the plugging removal agent and the position of the pipe column according to the outlet water of the horizontal well and the position of the well section which is mainly dredged and cleaned:
firstly, for a horizontal well with water discharged from a target point A, a water plugging pipe column is generally used for injecting a water plugging agent at the target point A, when plugging is removed, the water plugging pipe column is lowered to the target point B, a casing gate is opened, the water plugging removing agent is injected from an oil pipe (positive replacement), and the casing gate is closed after the water plugging removing agent covers all horizontal well sections (from the target point A to the target point B); and (4) continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
For the horizontal well with water discharged at the target B, the water plugging tubular column generally injects a water plugging agent at the target B, when plugging is removed, the upper body of the water plugging tubular column is 1-3m away from the upper part of the water outlet layer section, a casing gate is opened, the water plugging removal agent is injected from the oil pipe (just for replacement), and the casing gate is closed after the water plugging removal agent covers the horizontal well section above the water outlet layer section (from the target A to the upper part of the water outlet layer section); and (4) continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
And thirdly, completing the large-drift-diameter precise sand filtering pipe by adopting the construction of a light oil pipe, and completing the casing perforation, filter hanging and filter completion by adopting the construction of an oil pipe and a washing pipe.
The prior art problem solved by the step 4 is as follows: the blockage removal after the blockage is a necessary condition for ensuring the liquid production, the existing blockage removal water aqua only acts on partial blockage removal and can not realize the blockage removal of the whole well section (extrusion injection method), and the invention adopts a 'displacement method' mode, thereby improving the blockage removal coverage rate and improving the blockage removal effect.
The four steps are carried out step by step, and each step is required to be in place, otherwise, the whole effect is influenced.
The injection process control method of the horizontal well water shutoff agent disclosed by the invention is used for accumulating the test summary, experience and practice of an oil field, and is mainly used for carrying out absolute control on the aspects of pipe column positioning, oil layer protection, injection of the water shutoff agent, pollution relief and the like, so that the pertinence, the accuracy and the success rate of the horizontal well water shutoff are improved, and the method has the characteristics of simplicity, strong operability, effectiveness, practicability and the like, and therefore, the method has good popularization and use values.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention is obtained by field application practice summary, and is different from the existing water plugging theoretical technology of the horizontal well. The method is mainly applied to water plugging of the horizontal well in a high-water-cut or ultra-high-water-cut development stage of a water-drive reservoir horizontal well (casing perforation and screen pipe well completion), 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: 42.7t of daily fluid before water plugging of a GOGD2P16 well, 0.4t of daily oil, 98.9 percent of water and 633m of liquid surface. After water is blocked, the daily liquid is 22.1m3, the daily oil is 7.4t at most, the water content is 66.5% at least, the liquid level is 804m, 1005 tons of oil production is accumulated by a cut-off (2020.7.10), 905 tons of oil is added, and the effective period reaches 260 days.
At present, the total number of horizontal wells of an oil field is 4660, and the number of the opened wells is 3381, wherein the ultra-high water-containing wells account for 49.7 percent (1682) of the number of the opened wells, the high-efficiency development difficulty is high, the water plugging treatment requirement of the ultra-high water-containing horizontal wells 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a fixed-point water lowering and plugging combined pipe string (casing perforation, filtration and well completion) of the invention;
FIG. 2 is a schematic view of a fixed-point water plugging combined pipe column (large-drift-diameter precise sand screen well completion) of the invention;
FIG. 3 is a schematic illustration of reservoir protection according to the present invention;
FIG. 4 is a schematic view of the injection process control mode (continuous injection, intermittent injection) of the water shutoff agent according to the present invention;
FIG. 5 is a schematic illustration of a clean-up wellbore construction string according to the present invention;
FIG. 6 is a dynamic curve of GOGD2P16 produced before water shutoff according to an embodiment of the present invention;
FIG. 7 is a drawing showing the change of a dynamic curve of the GOGD2P16 before and after water shutoff in the embodiment of the present invention;
FIG. 8 is a graph showing the dynamic curve of GD1-5P512 water shutoff in the embodiment of the present invention;
FIG. 9 is a graph showing the change of production dynamic curves before and after water plugging and plug removal of a GD1-5P512 well in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a horizontal well water shutoff agent injection process control method which comprises the following steps:
step 2, performing oil layer protection measures before water shutoff, and selecting single time or multi-stage oil layer protection in water shutoff according to construction pressure (figure 3); firstly, performing single oil layer protection on a well (less than 500) with a small injection water shutoff agent dosage, injecting an oil layer protective agent before injecting the water shutoff agent, namely injecting the protective agent with large discharge capacity, quickly establishing injection pressure to protect a low-permeability layer section or a high-oil layer section, adopting medium and low discharge capacity when injecting the water shutoff agent subsequently, and keeping the injection pressure to be less than the injection pressure when injecting the protective agent; secondly, for wells (more than 1000 square) with large injection amount of the water shutoff agent, performing oil layer protection for multiple times, injecting the oil layer protective agent for multiple times before and in the process of injecting the water shutoff agent, namely injecting the protective agent with the first large displacement, quickly establishing injection pressure to protect a low-permeability layer section or a high-oil-content layer section, injecting the water shutoff agent for the first time, wherein the injection pressure is kept to be smaller than that of the protective agent for the first time by adopting medium and low displacement during injection; stopping injecting the water shutoff agent when the injection pressure of the first water shutoff agent is close to the pressure of the protective agent of the first oil injection layer; implementing a second oil layer injection protective agent, namely injecting the protective agent with large discharge capacity, quickly establishing injection pressure, and after the injection pressure is greatly improved compared with the pressure at the end of the first water plugging agent injection, adopting middle-low discharge capacity to continuously inject the water plugging agent for the second time, wherein the injection pressure of the water plugging agent is kept to be smaller than that of the protective agent injected for the second time; and repeating the steps in sequence. For the well (500 plus 1000 sides) with proper water shutoff agent injection dosage, firstly, single oil layer protection is carried out, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of the protective agent injection, multiple times of oil layer protection can be considered; and fourthly, for the well injected with the oil layer protective agent without pressure rise or protective pressure establishment, stopping injecting the protective agent, changing to inject the water shutoff agent, injecting the oil layer protective agent after the injection pressure of the water shutoff agent is slightly increased (increased by 2-3MPa), establishing the injection pressure of the protective agent, protecting the low-permeability layer section or the high-oil-content layer section, and injecting the water shutoff agent subsequently.
And 4, optimizing and selecting the injection mode of the plugging removal agent and the position of the pipe column according to the outlet water 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 strong control plugging removal (figure 5): firstly, for a horizontal well with water discharged from a target point A, a water plugging pipe column is generally used for injecting a water plugging agent at the target point A, when plugging is removed, the water plugging pipe column is lowered to the target point B, a casing gate is opened, the water plugging removing agent is injected from an oil pipe (positive replacement), and the casing gate is closed after the water plugging removing agent covers all horizontal well sections (from the target point A to the target point B); continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction; for the horizontal well with water outlet at the B target point, a water plugging agent is generally injected into the B target point by a water plugging tubular column, when the water plugging is removed, the upper body of the water plugging tubular column is 1-3m from the upper part of the water outlet layer section, a casing gate is opened, a water removing agent (positive replacement) is injected from an oil pipe, and the casing gate is closed after the water removing agent covers the horizontal well section above the water outlet layer section (from the A target point to the upper part of the water outlet layer section); and (4) continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
The following are specific examples to which the invention may be applied:
specific example 1: GOGD2P16 well water shutoff operation
(1) Basic conditions of water shut-off well
Referring to FIG. 6, the GOGD2P16 well belongs to a sandstone reservoir, the temperature is 65 ℃, and the mineralization degree is 9166 mg/L; 7 months in 2018, and the daily juice at the initial stage is 22.6m3And d, the daily oil content is 13.8t/d, the water content is 39.1 percent, the water content starts to rise rapidly under the influence of side water, the daily liquid before water plugging is 42.7t/d, the daily oil content is 0.4t/d, the water content is 98.9 percent, and the liquid level is 633 m. The well area reserves are 7.8 ten thousand tons, 0.13 ten thousand tons are accumulated, and the residual recoverable reserves are 2.36 ten thousand tons. The saturation of the residual oil near the well is as high as 61.8 percent, which indicates that the well has the potential of water plugging.
(2) Method and process for controlling water shutoff agent injection process
a. Fixed-point downward water plugging combined pipe column
The well is completed by casing perforation and filter hanging, so the water plugging pipe column of the well adopts an oil pipe and washing pipe combined mode; analyzing that the water outlet point is at the target point B, and lowering the tail of the water plugging pipe column to the target point B;
b. oil layer protection before and during water shutoff
The well construction has the test injection pressure of 5MPa and the starting pressure of higher, the oil layer protective agent is injected for the first time, and the discharge capacity is 10m3H, the injection pressure is 9.0MPa at the end; the first injection of water shutoff agent with the discharge capacity of 6m3Stopping injecting the water shutoff agent when the injection pressure is 8.8 MPa; injecting oil layer protective agent for the second time, the discharge capacity is 10m3H, the injection pressure at the end is 13.0 MPa; the second injection of water shutoff agent with the discharge capacity of 6m3Stopping injecting the water shutoff agent when the injection pressure is 12.8MPa, and completing the injection of the water shutoff agent to meet the construction requirement;
c. plugging method for improving retention capacity of water plugging agent by adopting intermittent injection
The well has high injection testing pressure and large boosting amplitude, and the water plugging agent adopt a continuous mode in consideration of the injectability and the injectability.
d. High-efficiency strong-control full-well-section covering blockage removal process method
The well is a horizontal well with water outlet at a target B, a water plugging agent is injected at the target B under a water plugging tubular column, when the water plugging is removed, the water plugging tubular column is lifted to the upper part of the water outlet layer section by 1-2m, a casing gate is opened, the water plugging removal agent (replacement) is injected from an oil pipe, and the casing gate is closed after the water plugging removal agent covers the horizontal well section above the water outlet layer section (from the target A to the upper part of the water outlet layer section); and (4) continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
(3) Water blocking effect
Referring to fig. 7, the effect of the goad 2P16 well water shutoff implementation is: daily liquid 44.6m before water shutoff3(d), daily oil is 0.6t/d at most, water content is 98.7% at least, liquid level is 633m, and daily liquid is 22.1m after water plugging3The maximum daily oil is 7.4t/d, the minimum water content is 66.5 percent, the liquid level is 804m, 1205 tons of accumulated oil production, 1005 tons of oil increase and more than 280 days of validity period.
Specific example 2: GD1-5P512 well water shutoff operation
(1) Basic conditions of water shut-off well
Referring to FIG. 8, GD1-5P512 well was put into production in 6 months 2004, the initial daily oil capacity was 39.6t/d, the water content was 31.5%, the water content increased to 90% or more in 6 months 2009, the daily fluid before water shutoff was 47.5t/d, the daily oil was 0.3t, the water content was 99.5%, and the production curve is shown in FIG. 2. According to the analysis of the oil deposit dynamic and static and production well history data, the heterogeneity contradiction of the horizontal well section of the well is prominent, so that the oil well has high water content, and GD1-5P512 well water plugging is specially carried out for further expanding the sweep, improving the oil well yield and achieving the purposes of increasing oil and lowering water.
(2) Method and process for controlling water shutoff agent injection process
a. Fixed-point downward water plugging combined pipe column
The well is completed by casing perforation and filter hanging, so the water plugging pipe column of the well adopts an oil pipe and washing pipe combined mode; analyzing the water outlet point at the target point A, so that the tail of the water plugging pipe column is deeply lowered to the target point A;
b. oil layer protection before and during water shutoff
The well construction has the test injection pressure of 0MPa, the starting pressure is low, the water plugging agent is injected for the first time, and the discharge capacity is 6m3Stopping injecting the water shutoff agent when the injection pressure is 2.2MPa, injecting the oil layer protective agent for the first time, wherein the discharge capacity is 10m3H, the injection pressure is 6.5.0MPa at the end; the second injection of water shutoff agent with the discharge capacity of 6m3H, when the injection pressure is 3.5MPa when 50 percent of the dosage of the water shutoff agent is injected, stopping the injection, and replacing 30m3Closing the well for 48 hours; the remaining 50 percent of the water plugging agent is injected for the third time, the construction pressure is increased to 6.2MPa, and the injection is replaced by 30m3Completing the injection of the water plugging agent;
c. plugging method for improving retention capacity of water plugging agent by adopting intermittent injection
The well has low injection testing pressure and adopts an intermittent method for injection: the second injection of water shutoff agent with the discharge capacity of 6m3H, when the injection pressure is 3.5MPa when 50 percent of the dosage of the water shutoff agent is injected, stopping the injection, and replacing 30m3Closing the well for 48 hours; the residual 50 percent of the water plugging agent is injected for the third time, the pressure rises to 6.2MPa and 2.7MPa after the construction is finished, and a better pressure boosting effect is achieved.
d. High-efficiency strong-control full-well-section covering blockage removal process method
The first blockage removal operation: the well has low injection pressure and slow pressure rise, and takes the plugging property and the validity into consideration, and the well blocks water without adopting a blockage removal measure.
And (3) second blockage removal operation: the well has no blockage removal phenomenon after water plugging, and has low liquid volume, and secondary blockage removal measures are carried out; the well is a horizontal well with water outlet at the target point A, a water plugging agent is injected at the target point under a water plugging pipe column, when the water plugging is removed, the water plugging pipe column is lowered to the upper part of the water outlet at the target point B for 1-2m, a casing gate is opened, a water plugging removal agent (positive replacement) is injected from an oil pipe, and the casing gate is closed after the water plugging removal agent covers a horizontal well section above a water outlet layer section (from the target point B to the upper part of the water outlet layer section); and (4) continuously injecting a plugging removal agent (positive extrusion) from the oil pipe, injecting a proper amount of displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
(3) Water blocking effect
Referring to fig. 9, the water plugging implementation effect of the GD1-5P512 well is as follows: the production is carried out in 6 months in 2004, the oil capacity in the initial stage is 39.6t, the water content is 31.5 percent, the water content is increased to more than 90 percent in 6 months in 2009 and is high, the oil content in the previous stage is only 0.3t/d and the water content is 98.7 percent; after water plugging and plugging removal measures are carried out in 2017, the peak daily oil is 7.5t/d, the minimum water content is 75.2%, 600 tons of oil are added in an accumulated mode, and the effective period reaches 390 days.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred 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 (14)
1. A horizontal well water shutoff agent injection process control method is characterized by comprising the following steps:
step 1: lower positioning pipe column
A water plugging combined pipe column is placed at a fixed point, and under the condition that the water outlet position is clear, the water plugging combined pipe column is designed and selected according to the water outlet position and the current underground pipe column;
and 2, step: protecting oil-bearing formations
Carrying out oil layer protection measures before water plugging, and selecting single-time or multi-stage oil layer protection before water plugging according to construction pressure;
and step 3: water shutoff agent injection process control
Continuous injection or intermittent injection is selected according to the properties of the water plugging agent and the construction pressure, so that the resident plugging capability of the water plugging agent is improved;
and 4, step 4: cleaning a wellbore
According to the outlet water of the horizontal well and the position of the well section which is mainly dredged and cleaned, the injection mode of the plugging removal agent and the position of the pipe column are optimized and selected, and the purpose of high-efficiency strong-control plugging removal is achieved.
2. The horizontal well water shutoff agent injection process control method according to claim 1, wherein the horizontal well comprises a casing perforation and filter completion well and a large-drift-diameter precision screen pipe completion horizontal well; the casing perforation filter hanging completion refers to that after a casing is put into a horizontal section of an oil layer and is cemented, perforation is carried out on the oil layer position of the horizontal section, and a sand filter pipe is hung at the perforation position to prevent sand from being produced, so that the normal production of an oil well is ensured; the large-drift-diameter precision sieve tube well completion means that after the precision sieve tube is connected to the horizontal section of the oil layer under the sleeve, a perforation process is omitted, and a well completion mode for preventing sand is achieved.
3. The horizontal well water shutoff agent injection process control method according to claim 1, characterized in that in the step 1, under the condition of definite water outlet position, a water shutoff combined pipe column is designed and selected according to the water outlet position and the current underground pipe column: 1) the casing perforation, filter hanging and well completion adopts a combination of a light oil pipe and a wash pipe to go down to a water outlet position; 2) and (4) lowering the oil production light oil pipe of the large-drift-diameter precision screen pipe well completion horizontal well to a water outlet position.
4. The method for controlling the injection process of the horizontal well water shutoff agent according to any one of claims 1 to 3, wherein in the step 2, oil pipe or oil pipe + pipe flushing injection is generally adopted, and oil layer protective agent is injected before the water shutoff agent is injected or oil layer protective agent is injected for multiple times before the water shutoff agent is injected and in the process of injecting the water shutoff agent for oil layer protection.
5. The horizontal well water shutoff agent injection process control method according to claim 4, characterized in that in step 2, for a well in which the injection water shutoff agent dosage is less than 500 square, single oil layer protection is performed, an oil layer protective agent is injected before the injection water shutoff agent injection, namely, a large-displacement injection protective agent is injected, the injection pressure is rapidly established, a low-permeability layer section or a high-oil layer section is protected, medium-low displacement is adopted during the subsequent injection of the water shutoff agent injection, and the injection pressure is kept to be less than the injection pressure during the injection of the protective agent.
6. The horizontal well water shutoff agent injection process control method according to claim 4, characterized in that in step 2, for a well with the injection water shutoff agent dosage being greater than 1000 square, multiple times of oil layer protection are performed, before the injection of the water shutoff agent and during the injection of the water shutoff agent, multiple times of oil layer protective agent are injected, namely, the protective agent is injected with a first large displacement, the injection pressure is rapidly established, a low-permeability layer section or a high-oil layer section is protected, the water shutoff agent is injected for the first time, 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 protective 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 protective agent of the first oil injection layer; implementing a second oil layer injection protective agent, namely injecting the protective agent with large discharge capacity, quickly establishing injection pressure, and after the injection pressure is greatly improved compared with the pressure at the end of the first water plugging agent injection, adopting middle-low discharge capacity to continuously inject the water plugging agent for the second time, wherein the injection pressure of the water plugging agent is kept to be smaller than that of the protective agent injected for the second time; and repeating the steps in sequence.
7. The horizontal well water shutoff agent injection process control method according to claim 4, characterized in that in the step 2, for the well injected with the water shutoff agent dosage of 500-1000 sides, single oil layer protection is firstly performed, and when the injection pressure of the water shutoff agent is close to or equal to the pressure of the protective agent, multiple oil layer protection is adopted.
8. The method for controlling the injection process of the horizontal well water shutoff agent according to claim 4, wherein in the step 2, for the well in which the injected oil layer protective agent does not rise pressure or the protective pressure is not established, 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 rises by 2-3MPa, the oil layer protective agent is injected, the injection pressure of the protective agent is established, the low-permeability layer section or the high-oil-content layer section is protected, and the injection of the water shutoff agent is subsequently injected.
9. The horizontal well water shutoff agent injection process control method according to claim 1, characterized in that in the step 3, oil pipe injection is adopted, and the injection control mode of the water shutoff agent is optimally selected according to the water shutoff agent property and the pressure of the injected water shutoff agent.
10. The horizontal well water shutoff agent injection process control method according to claim 9, characterized in that in the step 3, intermittent injection: for a horizontal oil well with small pressure rise amplitude and low rise speed of the injected water shutoff agent, continuous injection is difficult to reside, channeling is easy, the effective period after plugging is short, and the water shutoff economic benefit is poor.
11. The horizontal well water shutoff agent injection process control method according to claim 9, characterized in that in the step 3, the continuous injection: for a horizontal oil well with large pressure rise range 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 construction injection displacement and the injection concentration of the water shutoff agent are reduced.
12. The method for controlling the injection process of the horizontal well plugging agent according to claim 1, wherein in the step 4, for a section of the horizontal well which is close to the vertical well and has water outlet, the plugging agent is injected from the near end of the vertical well under the water plugging pipe column, when plugging is removed, the water plugging pipe column is lowered to one end of the horizontal well section which is far away from the vertical well, the casing gate is opened, the plugging removal agent is injected from the oil pipe, and the casing gate is closed after the plugging removal agent covers all the horizontal well sections; and (4) continuously injecting the plugging removal agent from the oil pipe, injecting the displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
13. The injection process control method of the horizontal well plugging agent according to claim 1, wherein in the step 4, for the horizontal well with a horizontal well section far away from the vertical well and a water outlet at one end, the plugging agent is injected at a water outlet point under a water plugging pipe column, when plugging is removed, the water plugging pipe column is lifted to the upper part of the water outlet interval for 1-3m, a casing gate is opened, the plugging removal agent is injected from an oil pipe, and when the plugging removal agent covers the horizontal well section above the water outlet interval, the casing gate is closed; and (4) continuously injecting the plugging removal agent from the oil pipe, injecting the displacement fluid after the plugging removal agent is injected, and closing the well for reaction.
14. The horizontal well water shutoff agent injection process control method according to claim 1, wherein in the step 4, the large-drift-diameter precise sand screen well completion adopts the construction of a light oil pipe, and the casing perforation filter hanging well completion adopts the construction of an oil pipe and a flushing pipe.
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