CN106930713B - Casing pipe damage repairing method - Google Patents
Casing pipe damage repairing method Download PDFInfo
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- CN106930713B CN106930713B CN201511032551.7A CN201511032551A CN106930713B CN 106930713 B CN106930713 B CN 106930713B CN 201511032551 A CN201511032551 A CN 201511032551A CN 106930713 B CN106930713 B CN 106930713B
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 111
- 239000000126 substance Substances 0.000 claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000007789 sealing Methods 0.000 claims abstract description 55
- 238000010276 construction Methods 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000005516 engineering process Methods 0.000 claims abstract description 17
- 230000008439 repair process Effects 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 241000191291 Abies alba Species 0.000 claims description 17
- 230000000246 remedial effect Effects 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 8
- 238000011001 backwashing Methods 0.000 claims description 7
- 238000007790 scraping Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000002981 blocking agent Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 13
- 238000010168 coupling process Methods 0.000 abstract description 13
- 238000005859 coupling reaction Methods 0.000 abstract description 13
- 239000004568 cement Substances 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000011010 flushing procedure Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000005406 washing Methods 0.000 description 9
- 239000004570 mortar (masonry) Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007711 solidification Methods 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a casing damage repairing method, and belongs to the technical field of oil extraction. The method comprises the following steps: determining a treatment well section for casing damage in the oil-water well; arranging an ash plug between the treatment well section and the production well section; setting a plugging pipe column in the treatment well section; plugging the top boundary of the treatment well section by sticking the expansion pipe on a sleeve in the oil-water well; injecting a chemical plugging agent into an annular space between the casing pipe without the coupling at the lower section of the plugging pipe column and the casing pipe, and plugging the bottom boundary of the treatment well section; and drilling a cement plug to restore an oil flow channel in the shaft. The invention seals the top boundary of the treatment well section by expanding the expansion pipe on the upper section of the sealing pipe column to stick to the sleeve pipe, and then seals the annular space between the sleeve pipe and the non-coupling sleeve pipe on the lower section of the sealing pipe column by chemical sealing agent, thus sealing the bottom boundary of the treatment well section and realizing the repair of the treatment well section. The problems of long construction period, complex construction procedures and high construction cost of the related technology are solved, and the purposes of safely and quickly repairing the damage of the oil-water well casing and reducing the construction cost are achieved.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a casing damage repairing method.
Background
As the development of oil fields enters the middle and later stages of development, the problem of casing damage of oil-water wells (oil-water wells are oil production wells or water injection wells) is increasingly prominent, the problem seriously affects the normal production of the oil-water wells, and the problem brings difficulty to the operation and construction of the oil-water wells.
At present, the means for repairing and treating the oil-water well with long-section and multi-point casing damage comprises casing replacement, small casing re-cementing and the like.
Disclosure of Invention
In order to solve the problems of long construction period, complicated construction procedures and high construction cost in the prior art, the embodiment of the invention provides a casing damage repairing method. The technical scheme is as follows:
according to a first aspect of the present invention, there is provided a casing damage repair method, the method comprising:
determining a treatment well section for casing damage in an oil-water well, wherein the treatment well section is a well section needing to be repaired in the oil-water well;
arranging an ash plug between the treatment well section and the production well section, wherein the production well section is a well section where a production layer is located;
setting a plugging pipe column in the treatment well section, wherein the plugging pipe column consists of an expansion pipe and a lower section of casing without a coupling, and the expansion pipe is positioned at a design position above a top boundary of the treatment well section;
plugging the top boundary of the treatment well section by sticking the expansion pipe on a casing pipe in the oil-water well;
injecting a chemical plugging agent into an annular space between the casing pipe without a coupling at the lower section of the plugging pipe column and the casing pipe, and plugging the bottom boundary of the treatment well section;
and drilling the ash plug, recovering the oil flow channel in the well casing in the oil-water well, and completing the plugging construction.
Optionally, the determining the remedial well segment for casing damage comprises:
and determining the treatment well section of the casing damage through a casing turbine flow leakage finding technology and a casing hole diameter testing technology.
Optionally, running a plugging string in the remedial well segment comprises:
lowering the plugging tubular column into the remedial well section;
determining the position of an expansion pipe on the plugging pipe column through a natural gamma depth correction technology;
and determining the position of the plugging tubular column according to the position of the expansion pipe, so that the expansion pipe on the plugging tubular column is positioned at a preset height above the top boundary of the treatment well section.
Optionally, said injecting a chemical plugging agent into an annular space between said casing and said casing lower section of said plugging string to plug a bottom zone of said remediation interval, comprising:
a chemical plugging agent injection sealing pipe column is put into the plugging pipe column;
installing a Christmas tree, and connecting the sealing pipe column injected with the chemical plugging agent with a pump truck through the Christmas tree;
injecting a chemical plugging agent into the annular space through the pump truck.
Optionally, the injecting a chemical plugging agent into the annular space by the pump truck comprises:
injecting a preset volume of the chemical plugging agent into the chemical plugging agent injection sealing tubular column through the pump truck;
and injecting water with a preset volume into the chemical plugging agent injection sealing pipe column through the pump truck, wherein the water with the preset volume is used for pushing the chemical plugging agent into the bottom of the plugging pipe column in a displacement manner.
After the sealing pipe column injected with the chemical plugging agent is lifted, water is injected through the pump truck to carry out backwashing;
and injecting water with a preset volume into an annular space between the chemical plugging agent injection sealing pipe column and the sleeve through the pump truck, and extruding the chemical plugging agent into the annular space between the plugging pipe column and the sleeve.
Optionally, after the chemical plugging agent injection sealing string is lifted upwards, water is injected by the pump truck to perform backwashing, including:
lifting the sealing pipe column injected with the chemical plugging agent to enable the sealing pipe column injected with the chemical plugging agent to be positioned above the plugging pipe column;
and injecting water into the annular space between the chemical plugging agent injection sealing pipe column and the sleeve through the pump truck to perform backwashing.
Optionally, after injecting the chemical plugging agent into the annular space by the pump truck, the method further comprises:
and closing the oil-water well for a preset time till the chemical plugging agent is solidified.
Optionally, the chemical plugging agent is a thermosetting resin. Provided by the institute of oil extraction engineering of China North oil field Branch company, the patent numbers: ZL 201110314478.8.
Optionally, before the determining the treatment well section of casing damage in the oil-water well, the method further comprises:
and (5) dredging the oil-water well through a pigging gauge.
Optionally, before running a plugging string in the remedial wellbore interval, the method further comprises:
and scraping the whole well section sleeve above the ash surface by a sleeve scraper, wherein the ash surface is the upper end surface of the ash plug.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the upper section of the plugging pipe column is expanded and attached to the sleeve to plug the top boundary of the damaged well section of the sleeve, and then the annular space between the casing without collar and the sleeve at the lower section of the plugging pipe column is plugged by chemical plugging agent to plug the bottom boundary of the damaged well section of the sleeve, so that the damaged oil-water well of the sleeve is repaired. The problems of long construction period, complex construction procedures and high construction cost in the related technology are solved. The purposes of safely and quickly repairing the damage of the oil-water well casing and reducing the construction cost are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for repairing casing damage in accordance with an embodiment of the present invention;
FIG. 2-1 is a flow chart illustrating another method of casing damage repair according to an embodiment of the present invention;
FIG. 2-2 is a flow chart of the embodiment of FIG. 2-1 illustrating the placement of a plugging string;
fig. 2-3 is a flow chart of injecting the chemical plugging agent in the embodiment shown in fig. 2-1.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of a casing damage repair method according to an embodiment of the present invention, which is illustrated in the present embodiment by applying the casing damage repair method to repair a damaged well section of a damaged casing. The method for repairing the damaged sleeve comprises the following steps:
in step 101, a treatment well section for casing damage in an oil-water well is determined, wherein the treatment well section is a well section needing to be repaired in the oil-water well.
In step 102, a plug is placed between the remediation interval and the production interval, which is the interval in which the production zone is located.
In step 103, a plugging string is lowered into the treatment well section, the plugging string is composed of an expansion pipe and a lower section of casing without coupling, and the expansion pipe is located at a design position above a top boundary of the treatment well section.
In step 104, the top boundary of the treatment well section is sealed off by expanding the expansion pipe on the casing pipe in the oil-water well.
In step 105, injecting a chemical plugging agent into an annular space between the casing pipe without a collar at the lower section of the plugging string and the casing pipe, and plugging the bottom boundary of the treatment well section.
In step 106, drilling a cement plug, recovering an oil flow channel in a shaft in the oil-water well, and completing plugging construction.
In summary, according to the casing damage repairing method provided by the embodiment of the invention, the top boundary of the casing damage well section is plugged by expanding the expansion pipe at the upper section of the plugging pipe column on the casing, the annular space between the casing without collar and the casing at the lower section of the plugging pipe column is plugged by the chemical plugging agent, and the bottom boundary of the casing damage well section is plugged, so that the oil-water well with the damaged casing is repaired. The problems of long construction period, complex construction procedures and high construction cost in the related technology are solved. The purposes of safely and quickly repairing the damage of the oil-water well casing and reducing the construction cost are achieved.
Fig. 2-1 is a flow chart illustrating another casing damage repair method according to an embodiment of the present invention, which is applied to repair a damaged well section of a damaged casing in an oil-water well. The method for repairing the damaged sleeve pipe can comprise the following steps:
in step 201, the oil-water well is pigged by a pigging gauge.
When the casing damage repairing method provided by the embodiment of the invention is used, firstly, the production pipe column in the oil-water well is taken out, and the oil-water well is subjected to well dredging through the well dredging gauge. Illustratively, the production string includes tubing, a sucker rod, and a pump.
The process of drifting through the drift size gauge is as follows: the method comprises the following steps that a drifting tubular column with a drifting gauge is put in, wherein the drifting tubular column comprises an oil pipe, an oil pipe buckle changing joint and the drifting gauge, the oil pipe is arranged at the upper end of the drifting tubular column, the lower end of the oil pipe is connected with the oil pipe buckle changing joint, and the lower end of the oil pipe buckle changing joint is connected with the drifting gauge; the oil pipe, the oil pipe buckle changing joint and the drift size gauge are in threaded connection. When the drifting pipe column is put in, the drifting pipe column is put in from a well mouth to the bottom of the artificial well at the speed of 8-10 m/min (meter/minute), then the well is reversely flushed, clean water is pumped in from the oil sleeve annulus to be used as flushing fluid, the flushing fluid returns from an oil pipe, and the discharge amount of the flushing fluid is controlled to be 20-30 m3And h (cubic meter per hour), stopping washing the well when clear water returns from the oil pipe, and taking out the drifting pipe column.
In step 202, a remedial well segment for casing damage is determined by casing turbine flow leak finding techniques and casing caliper testing techniques.
And after the drifting is finished, determining a treatment well section of the damaged casing through a casing turbine flow leakage finding technology and a casing hole diameter testing technology.
Specifically, at first, find the hourglass through the technique of finding the hourglass of sleeve pipe turbine flow, should find the hourglass process and be: a leakage finding test tool pipe string with a turbine flowmeter is put into the damaged casing pipe, the leakage finding test tool pipe string comprises a weighting rod and the turbine flowmeter, the leakage finding test tool pipe string is connected with a ground test vehicle through a test cable, and the turbine flowmeter is put into the casing pipe through the ground test vehicle releasing the test cable; clean water is continuously injected into a wellhead by using a pump truck, and the discharge capacity of the injected clean water is controlled to be 15-25 m3And h, measuring the flow change at different positions in the casing through a turbine flowmeter to determine the exact well section with the casing broken. The process can refer to the related art, and is not described herein.
And then carrying out a casing hole diameter test, specifically, the test process comprises the following steps: and (2) putting a casing hole diameter tester in the damaged casing, wherein the casing hole diameter tester is connected with a ground test vehicle through a test cable, the ground test vehicle releases the test cable to put the hole diameter tester into the damaged casing, the casing hole diameter tester is matched with the test vehicle to acquire casing hole diameter data, and then the result obtained by the casing turbine flow leakage finding technology is synthesized to determine the treatment well section of the casing damage.
In step 203, a plug is placed between the remediation interval and the production interval, which is the interval where the production zone is located.
And after the position of the damaged treatment well section of the casing is obtained, arranging an ash plug between the damaged treatment well section of the casing and the production well section, wherein the ash plug is positioned at a design position below the bottom boundary of the damaged treatment well section of the casing.
Illustratively, the process is: a cement injection pipe column with a bell mouth is arranged in the sleeve, and the cement injection pipe column is an oil pipe and the bell mouth from top to bottom from the well head; the oil pipe is in threaded connection with the bell mouth; injecting mortar from the interior of an oil pipe by using a 700-type pump truck, wherein the mortar is a mixture of oil well cement and clear water, and the density of the mortar is 1.8-1.85g/cm3(g/cubic centimeter) and the thickness of the ash plug is 10-15 m (meter); controlling the discharge capacity of a 700-type pump truck to be 20-30 m3And h, enabling the upper surface of the ash plug to be 35-45 m below the bottom boundary of the treatment well section of the casing damage.
After the mortar is injected, waiting for 48 hours until the mortar plug is solidified, then lowering a mortar injection pipe column to probe the upper surface of the mortar plug, and determining whether the actual depth of the mortar surface meets the requirement or not, and if not, adjusting.
In step 204, the casing scraper scrapes the casing of the whole well section above the ash surface, which is the upper end surface of the ash plug.
After the plug of cement is formed in the casing, the full-bore casing above the cement surface is scraped by a casing scraper.
Illustratively, the process of scraping the casing is: and (3) putting a scraping pipe column with a GX-T140 casing scraper into the casing to scrape the inner wall of the casing above the ash surface (the upper surface of the ash) for one time, removing scale, wax and other inner wall obstructions on the inner wall of the underground casing, and repeatedly scraping for 3 times at the upper and lower 10-30 m of the expansion pipe subsidy well section. The upper end of the sleeve scraping pipe column is provided with an oil pipe, the lower end of the oil pipe is connected with an oil pipe buckle changing connector, and the lower end of the oil pipe buckle changing connector is connected with a sleeve scraper; the oil pipe, the oil pipe buckle adapter and the casing scraper are in threaded connection. And (3) performing reverse well flushing after the sleeve is scraped, namely pumping clear water as well flushing liquid from the annular space of the oil sleeve, returning the well flushing liquid out of the oil pipe, and controlling the discharge amount of the well flushing liquid to be 20-30 m3And h, stopping washing the well and taking out the scraping pipe column when clear water returns from the oil pipe.
By the end of this step, the previous preparation is completed.
In step 205, a plugging string is lowered into the damaged treatment well section of the casing, the plugging string is composed of an expansion pipe and a lower casing without coupling, and the expansion pipe is located at a design position above the top boundary of the damaged treatment well section of the casing.
After the preparation work of the previous stage is finished, a plugging pipe column is put into the damaged treatment well section of the casing pipe, the plugging pipe column is composed of an expansion pipe and a lower section of casing pipe without coupling, and the expansion pipe is located at a design position above the top boundary of the damaged treatment well section of the casing pipe.
As shown in fig. 2-2, this step may include the following 3 sub-steps:
in substep 2051, a plugging string is lowered into the remedial wellbore section.
Firstly, determining a damaged treatment well section of the casing according to the measurement results of a turbine flow leakage finding technology and a casing hole diameter testing technology, and determining the length and the running depth of a plugging pipe column.
The casing plugging tubular column comprises an expansion pipe, a casing variable-buckle short section, a casing centralizer and a coupling-free casing from top to bottom; the coupling-free casing, the casing centralizer, the casing variable-buckle short section and the expansion pipe are in threaded connection; the casing pipe plugging tubular column is lowered into a preset plugging position through a connecting oil pipe, and the connecting oil pipe sequentially comprises an expander connecting rod, a small oil pipe, a depth correcting short section and an oil pipe from bottom to top; the expander connecting rod, the small oil pipe, the depth correcting short section and the oil pipe are in threaded connection; wherein the oil pipe is an external thickened oil pipe with the diameter of 73mm (millimeter), the small oil pipe is an external thickened oil pipe with the diameter of 63.5mm, and the length ratio of the expansion pipe to the length of the non-coupling casing pipe is 1: 10. The outside diameter of the casing without collar was 114.3 mm.
In step 2052, the location of the expanded tubular on the plugged tubular string is determined via natural gamma-ray depth correction techniques.
After the plugging pipe column is put in, the position of the expansion pipe on the plugging pipe column is determined through a natural gamma depth correction technology. Illustratively, the process is: a testing and depth-correcting tool pipe string with a data transmission three-parameter logging instrument is put into the oil pipe, the testing and depth-correcting tool pipe string comprises a weighting rod and the data transmission three-parameter logging instrument, the testing and depth-correcting tool pipe string is connected with a ground testing vehicle through a testing cable, and the data transmission three-parameter logging instrument is put into the oil pipe through the ground testing vehicle releasing the testing cable; and determining the accurate position of the expansion pipe in the casing pipe plugging pipe column by calibrating the depth of the upper end face of the depth correcting nipple. The natural gamma depth correction technique refers to the related art and is not described in detail herein.
In step 2053, the location of the plugging string is determined according to the location of the expansion pipe, so that the expansion pipe on the plugging string is located at a preset height above the top boundary of the treatment well section with the damaged casing.
After the accurate position of the expansion pipe is determined, the position of the plugging pipe column is determined according to the position of the expansion pipe, so that the expansion pipe on the plugging pipe column is positioned at a preset height above the top boundary of the treatment well section with the damaged casing pipe. Illustratively, when the plugging tubular column is adjusted, the lower end face of the expansion pipe is positioned between 10 and 15 meters above the top boundary of the treatment well section with the damaged casing pipe; the lower end face of the non-coupling casing is located between 30 and 40m below the bottom boundary of a damaged treatment well section of the casing.
In step 206, the expansion pipe is pressed by a pump truck to be extruded and expanded, so that the expansion pipe is attached to the casing pipe in an expanding manner, and the top boundary of the treatment well section is plugged.
After the plugging pipe column is adjusted, the pipe column is pressed by a pump truck, the expansion pipe is extruded to expand, the expansion pipe is attached to the casing pipe in an expanding mode, and the top boundary of the treatment well section is plugged.
Illustratively, the process is: recording the hanging weight of the plugging pipe column, wherein an oil pipe is connected with a pressurizing pump through a pipeline; squeezing clear water from the oil pipe through a pipeline by using a pressurizing pump on the ground, starting the expansion pipe to expand from bottom to top when the pump pressure of the pressurizing pump reaches the critical pressure of the expansion pipe, and finishing the expansion construction of the expansion pipe when the oil pipe moves up the length of the whole expansion pipe and the pump pressure of the pressurizing pump suddenly drops and the well head casing returns water; when the oil pipe goes upward, the hanging weight of the oil pipe is controlled to be 10-30 KN (kilonewtons) above the hanging weight; the discharge capacity of clear water for pressing is 0.8-1.5 m3H is used as the reference value. After the expansion of the expansion pipe is finished, lifting the connecting oil pipe for 5-10 m, and performing casing pipe pressure test through a ground pump truck; the pressure of the casing pipe pressure test is 15MPa, the pressure stabilizing time is more than or equal to 30min, the pressure drop is less than or equal to 0.5MPa, the expansion construction of the expansion pipe and the casing pipe pressure test can refer to the related technology, and the details are not repeated.
In step 207, a chemical plugging agent is injected into the annular space between the casing pipe and the non-collar casing pipe at the lower section of the plugging string to plug the bottom boundary of the treatment well section.
When the pressure tests of the expansion pipe and the sleeves are qualified, and the bottom plug at the bottom end of the expansion pipe is fished out by the lower salvaging pipe column, injecting a chemical plugging agent into an annular space between the casing pipe and the non-coupling sleeve pipe at the lower section of the plugging pipe column, and plugging the bottom boundary of the treated well section.
As shown in fig. 2-3, this step may include the following 10 sub-steps:
in sub-step 207a, a chemical plugging agent injection sealing string is run from within the plugging string.
Firstly, a sealing pipe column injected with chemical plugging agent is put into the plugging pipe column. Illustratively, the process is: a chemical plugging agent injection sealing pipe column with a bell mouth is put into the sleeve, and the chemical plugging agent injection sealing pipe column comprises an oil pipe, a chamfer oil pipe and the bell mouth from the top to the bottom of a well mouth; threaded connection between oil pipe, chamfer oil pipe, the horn mouth, annotate chemical plugging agent and seal between the tubular column and be located under the no coupling sleeve pipe more than the terminal surface 5 ~ 10m, chamfer oil pipe is located between 20 ~ 30m more than horn mouth to the expansion pipe up end, chamfer oil pipe be external diameter 73mm, the terminal surface is 45 degrees thickening oil pipe.
In sub-step 207b, a Christmas tree is installed, and the sealing string injected with the chemical plugging agent is connected with the pump truck through the Christmas tree.
After the chemical plugging agent injection sealing pipe column is put in, a wellhead Christmas tree is installed, and the chemical plugging agent injection sealing pipe column is connected with a pump truck through the Christmas tree. Illustratively, the installation process of the Christmas tree is as follows: connecting an oil pipe of the sealing pipe column injected with the chemical plugging agent with an oil pipe hanger, wherein the oil pipe is in threaded connection with the oil pipe hanger; the oil pipe is hung and seated in the large four-way of the Christmas tree and tightly props against the jackscrew; the KYS65/25 Christmas tree is installed, the Christmas tree is connected with the pump truck through a pipeline, and the pipeline, the Christmas tree and the pump truck are in threaded connection. And after the connection is finished, closing the main gate of the Christmas tree, and carrying out pressure test on the well mouth and the ground pipeline, wherein the pressure is 25MPa and is stabilized for 3-5 min, and the well mouth is qualified without puncture and leakage so as to check whether the sealing performance of the well mouth is qualified.
In sub-step 207c, chemical plugging agent is injected into the annular space by a pump truck.
And after the Christmas tree is installed and the pressure test is qualified, injecting a chemical plugging agent into the annular space between the plugging tubular column and the sleeve through the pump truck.
The method comprises the following steps:
1) and injecting a chemical plugging agent with a preset volume into the chemical plugging agent injection sealing tubular column through a pump truck.
Firstly, injecting a chemical plugging agent with a preset volume into a sealing pipe column injected with the chemical plugging agent through a pump truck. Display deviceFor example, a 700-type pump truck is used to inject 1.0-2.5 m of chemical plugging agent3(cubic meter), wherein the chemical plugging agent is thermosetting resin.
2) And injecting water with a preset volume into the chemical plugging agent injection sealing pipe column through a pump truck, wherein the water with the preset volume is used for pushing the chemical plugging agent into the bottom of the plugging pipe column instead.
After injecting the chemical plugging agent of presetting the volume, pour into the water of presetting the volume into the chemical plugging agent of notes sealing tubular column through the pump truck, the water of presetting the volume is used for pushing the chemical plugging agent replacement shutoff tubular column bottom. Illustratively, clean water is injected into the tank at 3-9 m 3.
In the substep 207d, the chemical plugging agent sealing pipe column is lifted upwards, so that the chemical plugging agent sealing pipe column is positioned above the plugging pipe column.
After the chemical plugging agent is pushed in, the chemical plugging agent sealing pipe column is injected upwards, so that the chemical plugging agent sealing pipe column is positioned above the sealing pipe column. Illustratively, the lower end of the sealing pipe column injected with the chemical plugging agent is positioned 20-30 m above the upper end surface of the expansion pipe.
In sub-step 207e, the annular space between the chemical plugging agent injection sealing string and the casing is injected with water by a pump truck to perform backwashing.
After the sealing pipe column is lifted up after the injection of the chemical plugging agent is completed, water is injected into an annular space between the sealing pipe column and the sleeve pipe for injecting the chemical plugging agent by a pump truck to carry out reverse well washing, and clean water with 1-1.5 times well capacity is washed in a reverse circulation mode so as to clean the residual chemical plugging agent in the sealing pipe column of injecting the chemical plugging agent and avoid the chemical plugging agent from blocking the sealing pipe column of injecting the chemical plugging agent.
In sub-step 207f, a predetermined volume of water is injected into the annular space between the chemical plugging agent injection sealing string and the casing by the pump truck, and the predetermined volume of water is used for extruding the chemical plugging agent into the annular space between the plugging string and the casing.
After the completion of the back flushing of the annular space between the chemical plugging agent injection sealing pipe column and the casing pipe, injecting water with a preset volume into the annular space between the chemical plugging agent injection sealing pipe column and the casing pipe through a pump truck, wherein the water with the preset volume is used for squeezing the chemical plugging agent into the annular space between the plugging pipe column and the casing pipe, illustratively, injecting clear water by using a 700-type pump truck, injecting the clear water by 0.2-0.6 m3, and controlling the tail end face of the chemical plugging agent to be 30-40 m above the lower end face of the non-coupling casing pipe.
In substep 207g, after the chemical plugging agent is squeezed into the annular space, the oil-water well is closed for a predetermined length of time until the chemical plugging agent solidifies.
And after the injection of the chemical plugging agent is finished, closing the oil-water well for a preset time till the chemical plugging agent is solidified. Illustratively, the well is shut in for 3 to 7 days to wait for the chemical plugging agent to set.
In the substep 207h, the chemical plugging agent solidification time is over and the plugging agent plugging surface is probed.
After the chemical plugging agent is solidified, a chemical plugging agent plug is formed, and at the moment, the chemical plugging agent sealing pipe column is placed downwards to detect the chemical plugging agent plug surface (upper end surface); and determining the specific depth of the plugging surface of the chemical plugging agent. If the plugging surface of the chemical plugging agent is higher than the lower end surface of the plugging pipe column, the plugging surface is qualified.
In sub-step 207i, a chemical plugging agent plug is drilled through the drill plug string.
After the plug surface of the chemical plugging agent is determined to be qualified, a drilling plug pipe column with a tricone bit is put into the casing, the drilling plug pipe column comprises an oil pipe, a chamfer oil pipe, a screw drill and the tricone bit from top to bottom of a well head, and the oil pipe, the chamfer oil pipe, the screw drill and the tricone bit are in threaded connection; the method comprises the following steps of (1) putting a drilling plug pipe column from a wellhead at a speed of 3-10 m/min (meter/minute) to 5 +/-1 m above a plugging surface of a chemical plugging agent; then injecting a drilling plug flushing fluid through a 700-type pump truck for the oil pipe, wherein the discharge capacity of the drilling plug flushing fluid is 25-30 m3H; when the oil sleeve annular return liquid is consistent with the drilling plug well-flushing liquid entering the oil pipe, a drilling plug pipe column is put into the oil sleeve annular return liquid at the speed of 0.5-1 m/min, and the pressurization tonnage of the drilling plug pipe column is between 5-15 KN (kilonewtons); lifting and lowering the drill plug pipe column once every time the drill plug pipe column is lowered for 8-10 m; and when the plug is drilled to the ash level of-1 m, stopping drilling the plug and washing the well, when the return liquid from the oil sleeve annulus is consistent with the well washing liquid entering the oil pipe, stopping washing the well, and lifting the drill plug pipe column for 5-10 m.
In sub-step 207j, the casing is pressure tested.
And after the chemical plugging agent plug is drilled, performing casing pressure test to test the plugging effect of the chemical plugging agent.
Illustratively, the pressure testing process is as follows: the drill plug pipe string is connected with an oil pipe hanger, and the oil pipe hanger is connected with a wellhead blowout prevention assembly. The drilling plug pipe column, the tubing hanger and the blowout prevention assembly are in threaded connection; the oil pipe is hung and seated in the big four-way of the Christmas tree and tightly props against a wellhead jackscrew. Then the blowout prevention assembly and the pump truck are connected through a pipeline, the blowout prevention assembly and the pump truck are connected through threads, a wellhead blowout preventer and a large four-way connection gate of the Christmas tree are closed, the pressure of an annular space between a non-coupling sleeve and a plugging sleeve is tested by the ground pump truck in the drilling plug tubular column, the pressure is 15Mpa, the pressure stabilizing time is more than or equal to 30min, and the pressure drop is less than or equal to 0.5Mpa, so that the plugging effect of the chemical plugging agent is qualified.
In step 208, after the casing pipe pressure test is qualified, drilling a dust plug, recovering an oil flow passage in the shaft in the oil-water well, and completing plugging construction.
And after the casing pipe pressure test is qualified, drilling a dust plug, recovering an oil flow channel in the shaft in the oil-water well, and finishing plugging construction. Illustratively, after the plugging effect of the chemical plugging agent is qualified, drilling and plugging operation construction is continuously carried out, a drilling and plugging tubular column is put into the chemical plugging agent at the speed of 0.5-1 m/min, the pressurization tonnage of the drilling and plugging tubular column is controlled to be 5-15 KN, and the discharge capacity of drilling and plugging flushing liquid is 25-30 m3H; lifting and lowering the drill plug pipe column once every time the drill plug pipe column is lowered for 8-10 m; and after the drilling of the cement plug is finished, continuing drilling the plug to-1 m of the bottom of the artificial well, stopping drilling the plug and washing the well, and stopping washing the well when the oil sleeve annular return liquid is consistent with the well washing liquid entering the oil pipe, and taking out the drilling plug pipe column.
And after the step is finished, drilling a dust plug between the treatment well section with the damaged casing and the production well section, and recovering the oil flow channel in the shaft.
In order to facilitate the subsequent production string running construction of the oil-water well, the completion construction is performed after the ash plug is drilled. Illustratively, the process is: and (5) putting an oil production pipe column according to geological design requirements and engineering design. The oil production pipe column comprises an oil pipe, an oil pump, a sieve pipe or a gas anchor and a guide cone which are connected in a threaded manner from the top to the bottom of a well head.
In summary, according to the casing damage repairing method provided by the embodiment of the invention, after the injection of the chemical plugging agent is completed through the chemical plugging agent injection sealing pipe column, the chemical plugging agent injection sealing pipe column is lifted and the well is washed back, so that the effect of preventing the chemical plugging agent residue from blocking the chemical plugging agent injection sealing pipe column is achieved.
In summary, according to the casing damage repairing method provided by the embodiment of the present invention, the top boundary of the casing damage well section is sealed and plugged by expanding the expansion pipe at the upper section of the plugging pipe column on the casing, and then the annular space between the casing without collar and the casing at the lower section of the plugging pipe column is sealed and plugged by the chemical plugging agent, so as to seal the bottom boundary of the casing damage well section, thereby realizing the repairing of the oil-water well with damaged casing. The problems of long construction period, complex construction procedures and high construction cost in the related technology are solved. The purposes of safely and quickly repairing the damage of the oil-water well casing and reducing the construction cost are achieved.
Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method of casing damage repair, the method comprising:
determining a treatment well section for casing damage in an oil-water well, wherein the treatment well section is a well section needing to be repaired in the oil-water well;
arranging an ash plug between the treatment well section and the production well section, wherein the production well section is a well section where a production layer is located;
setting a plugging tubular column in the treatment well section, wherein the plugging tubular column comprises an expansion pipe, a casing pipe variable-buckle short section, a casing pipe centralizer and a lower section coupling-free casing pipe from top to bottom, and the expansion pipe is positioned at a design position above a top boundary of the treatment well section; the lower section of the coupling-free casing, the casing centralizer, the casing variable-buckle short section and the expansion pipe are all in threaded connection;
plugging the top boundary of the treatment well section by sticking the expansion pipe on a casing pipe in the oil-water well;
a chemical plugging agent injection sealing pipe column is put into the plugging pipe column;
installing a Christmas tree, and connecting the sealing pipe column injected with the chemical plugging agent with a pump truck through the Christmas tree;
injecting a preset volume of the chemical plugging agent into the chemical plugging agent injection sealing tubular column through the pump truck;
injecting a preset volume of water into the chemical plugging agent injection sealing tubular column through the pump truck, wherein the preset volume of water is used for pushing the chemical plugging agent into the bottom of the plugging tubular column;
after the sealing pipe column injected with the chemical plugging agent is lifted, water is injected through the pump truck to carry out backwashing;
injecting water with a preset volume into an annular space between the sealing pipe column injected with the chemical plugging agent and the sleeve through the pump truck, and extruding the chemical plugging agent into the annular space between the plugging pipe column and the sleeve;
and drilling the ash plug, recovering the oil flow channel in the well casing in the oil-water well, and completing the plugging construction.
2. The method of claim 1, wherein said determining an remedial wellbore segment for the casing failure comprises:
and determining the treatment well section of the casing damage through a casing turbine flow leakage finding technology and a casing hole diameter testing technology.
3. The method of claim 1, wherein running a plugging string in the remedial wellbore interval comprises:
lowering the plugging tubular column into the remedial well section;
determining the position of an expansion pipe on the plugging pipe column through a natural gamma depth correction technology;
and determining the position of the plugging tubular column according to the position of the expansion pipe, so that the expansion pipe on the plugging tubular column is positioned at a preset height above the top boundary of the treatment well section.
4. The method of claim 1, wherein after the lifting up of the chemical plugging agent sealing string, the pump truck injects water for backwashing, comprising:
lifting the sealing pipe column injected with the chemical plugging agent to enable the sealing pipe column injected with the chemical plugging agent to be positioned above the plugging pipe column;
and injecting water into the annular space between the chemical plugging agent injection sealing pipe column and the sleeve through the pump truck to perform backwashing.
5. The method of claim 1, wherein prior to determining the remedial wellbore segment for casing damage in an oil and water well, the method further comprises:
and (5) dredging the oil-water well through a pigging gauge.
6. The method of claim 1, wherein prior to running a plugging string in the remedial wellbore interval, the method further comprises:
and scraping the whole well section sleeve above the ash surface by a sleeve scraper, wherein the ash surface is the upper end surface of the ash plug.
7. The method of claim 1, wherein after injecting the chemical plugging agent into the annular space by the pump truck, the method further comprises:
and closing the oil-water well for a preset time till the chemical plugging agent is solidified.
8. The method according to any one of claims 1 to 7, wherein the chemical blocking agent is a thermosetting resin.
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| CN201511032551.7A CN106930713B (en) | 2015-12-31 | 2015-12-31 | Casing pipe damage repairing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108194045B (en) * | 2018-01-29 | 2020-07-10 | 刘东章 | Sleeve pipe prosthetic devices |
| CN108204216B (en) * | 2018-01-29 | 2020-06-30 | 通化石油工具股份有限公司 | Application method of casing pipe repairing device |
| CN110231436A (en) * | 2018-03-02 | 2019-09-13 | 中国石油天然气股份有限公司 | Casing loss detection method |
| CN108252673B (en) * | 2018-03-12 | 2019-02-19 | 刘屹凡 | A kind of petroleum casing pipe chemical method prosthetic device |
| CN109538148A (en) * | 2018-09-30 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of soft metal expandable casing patching coal bed gas well suck-back layer method |
| CN112681996B (en) * | 2019-10-18 | 2022-11-04 | 中国石油天然气股份有限公司 | Casing leakage repairing method |
| CN110725663B (en) * | 2019-11-06 | 2022-02-01 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
| CN113494267B (en) * | 2020-03-18 | 2023-04-28 | 中国石油化工股份有限公司 | Oil-gas-water well leakage point plugging operation method |
| CN114856472B (en) * | 2021-02-03 | 2024-09-27 | 中国石油天然气股份有限公司 | Sleeve repairing method and sleeve plugging tool |
| CN113445960A (en) * | 2021-06-24 | 2021-09-28 | 中国石油天然气股份有限公司 | Water plugging method for oil well casing damage |
| CN114320202B (en) * | 2022-01-08 | 2022-07-01 | 江苏省地质调查研究院 | Well repairing device and well repairing method |
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