CN114991711A - Completion process for deflecting section of horizontal well with ultra-short radius - Google Patents
Completion process for deflecting section of horizontal well with ultra-short radius Download PDFInfo
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- CN114991711A CN114991711A CN202210765618.1A CN202210765618A CN114991711A CN 114991711 A CN114991711 A CN 114991711A CN 202210765618 A CN202210765618 A CN 202210765618A CN 114991711 A CN114991711 A CN 114991711A
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- cement
- section
- well
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- short radius
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
Abstract
The invention relates to the technical field of drilling, in particular to a completion process of an inclined section of an ultra-short radius horizontal well, which comprises the following steps of S1, selecting an ultra-short radius horizontal well which completes well bore construction; step S2, sequentially connecting a screen pipe, a blind plate, an open hole packer, a cement injector, a deflecting section small casing, a releasing joint and a sending pipe column from bottom to top; step S3, all the devices in the step S2 are put into the bottom of the well; step S4, taking out the upper part of the releasing joint and sending the releasing joint into the pipe column; step S5, inserting an insertion type cementing tool; step S6, positively filling clear water to set an open hole packer; step S7, squeezing cement paste into the annular space according to the designed injection amount; step S8, replacing cement slurry in the small casing of the deflecting section into an annular section by using clean water; step S9, lifting the plug-in cementing tool above the releasing joint; s10, injecting clean water into the small casing pipe of the deflecting section to wash the well; step S11, cement is cured; s12, drilling a cement plug and a blind plate; the invention can seal and fix the deflecting segment and improve the stability of the deflecting segment.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a completion process for a deflecting section of an ultra-short radius horizontal well.
Background
In the process of oil well multilayer exploitation, imbalance in oil utilization is caused due to interlayer heterogeneity, so that partial layers are seriously flooded, and residual oil in partial layers with poor oil utilization is enriched, so that the oil well is difficult to exploit.
In the existing ultra-short radius horizontal well, because the deflecting section needs to penetrate through a stratum with a certain thickness to reach a target layer, the deflecting section possibly has the problem of a high water flooded layer, and if the deflecting section is not sealed, the high water flooded layer can seriously affect the oil output of a lower residual oil enrichment layer; in addition, in the process of treating casing damage wells by applying the ultra-short radius horizontal well technology, if a casing damage point is about 100 meters above a sidetrack target layer, the deflecting section is longer, and the stability of the deflecting section is also influenced.
Disclosure of Invention
The invention aims to solve the defects and provide a completion process for an deflecting section of a horizontal well with an ultra-short radius, which can seal and fix the deflecting section, control the influence of a high water flooded layer, reduce the influence of interlayer interference on lateral well drilling development, improve the stability of the deflecting section by well completion and well cementation of a small casing pipe of the deflecting section, and effectively submerge and use part of residual oil in a poor layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a completion process for an inclined section of an ultra-short radius horizontal well comprises the following steps:
step S1, selecting an ultra-short radius horizontal well with completed borehole construction;
step S2, sequentially connecting a sieve tube, a blind plate, an open hole packer, a cement injector, a small casing of a deflecting section, a releasing joint and a sending pipe column from bottom to top;
step S3, the sieve tube, the blind plate, the open hole packer, the cement injector, the small casing of the deflecting segment, the releasing joint and the sending pipe column which are connected in the step S2 are put into the bottom of the well until the sieve tube completely enters the horizontal segment of the ultra-short radius horizontal well;
step S4, pulling out the feeding pipe column to a well head;
step S5, inserting an insertion type cementing tool;
step S6, feeding a pipe column and positively injecting clear water to seal the open hole packer;
step S7, squeezing cement paste into the annular section according to the designed injection amount through an inserted cement injection tool and a cement injector;
step S8, replacing cement slurry in the small casing of the deflecting section into an annular section by clear water from a well head;
step S9, lifting the plug-in cementing tool above a releasing joint;
s10, feeding the pipe column, injecting clear water into the small casing pipe of the deflecting section, discharging the clear water from the original well casing pipe, washing the well for 2 weeks, and replacing the cement above the releasing joint;
s11, squeezing clear water into the original well casing to a certain pressure, closing the casing gate, waiting for setting of cement, and observing pressure change of a pressure gauge during waiting for setting;
and step S12, drilling the cement plug and the blind plate.
Further, in step S1, the open hole diameter range is 114-.
Further, in step S2, the outer diameter of the casing is 88.9mm, and the outer diameter of the open hole packer is 105 mm; the outer diameter and the inner diameter of the plug-in cementing tool are 85mm and 52mm respectively; the outside diameter and the inside diameter of the sieve tube are 73mm and 62mm respectively.
Further, in step S5, the running in cementing tool is connected to a cement injector.
Further, in step S7, the designed injection amount of the cement slurry is calculated according to the formula:
and calculating, wherein H is the length of the deflecting section.
Further, in step S9, the plug-in cementing tool is lifted 0.8-1.2m above the release sub.
Further, in step S11, the pump pressure when injecting clean water into the small casing of the deflecting section is 10 MPa.
The invention has the beneficial effects that:
according to the technical scheme, the invention has the beneficial effects that:
the inclined section is sealed and fixed through a sieve tube, a blind plate, an open hole packer, a cement injector, an inclined section small casing, a release joint and an inserted cementing tool, the influence of a high water flooded layer is controlled, the influence of interlayer interference on lateral well drilling development is reduced, and meanwhile, the stability of the inclined section is improved through cementing slurry injection in an annular space between the inclined section small casing and an open hole well, so that part of residual oil in a poor layer can be effectively excavated and used; the invention can seal and fix the deflecting section, control the influence of a high water flooded layer, reduce the influence of interlayer interference on the development of the side drilling well, and improve the stability of the deflecting section through the small casing well completion and well cementation of the deflecting section, so that the residual oil of a part of poorly used layers can be effectively submerged and used.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a diagram of the method steps of the present invention;
FIG. 2 is a schematic structural view of the present invention;
reference numerals: a sieve tube 1; a blind plate 2; an open hole packer 3; a cement injector 4; a small sleeve 5 at the deflecting section; a releasing joint 6; an insertion cementing tool 7; the borehole 8 is open hole.
Detailed Description
Referring to fig. 1 and 2, the present embodiment provides a completion process for an ultra-short radius horizontal well deviated section,
the first embodiment is as follows:
the method comprises the following steps:
step S1, selecting an ultra-short radius horizontal well with completed borehole construction;
step S2, sequentially connecting a sieve tube 1, a blind plate 2, an open hole packer 3, a cement injector 4, a small casing 5 of a deflecting section, a releasing joint 6 and a feeding pipe column from bottom to top; in the embodiment, a pressure gauge is further installed on the outer side of the small casing 5 of the deflecting section;
step S3, the screen pipe 1, the blind plate 2, the open hole packer 3, the cement injector 4, the small casing pipe 5 of the deflecting section, the releasing joint 6 and the sending pipe column which are connected in the step S2 are put into the bottom of the well until the screen pipe 1 completely enters the horizontal section of the ultra-short radius horizontal well; in the embodiment, the original well casing is arranged on the inner wall of the open hole well 8, and an annular space is formed between the small casing 5 of the deflecting section and the original well casing;
step S4, pulling out the feeding pipe column to a well head; in this embodiment, after the running string is pulled out to the wellhead, the cementing pipe of the insertion cementing tool 7 is connected to the running string;
step S5, inserting the insertion type cementing tool 7; in the embodiment, a feeding pipe column carries a cement injection pipe to pass through a releasing joint to enter a small casing 5 of an inclined section, so that the cement injection pipe is taken out and fed into the pipe column after being connected with a cement injector 4;
step S6, feeding the pipe column and positively injecting clear water to seal the open hole packer 3; in the embodiment, the feeding pipe column is inserted into the small casing pipe 5 of the deflecting section again, clear water is positively injected into the small casing pipe 5 of the deflecting section through the feeding pipe column, the open hole packer 3 is set, a hollow section is formed between the small casing pipe 5 of the deflecting section at the upper part of the open hole packer 3 and the original well casing pipe, and the feeding pipe column is taken out again;
step S7, squeezing cement paste into the annular section according to the designed injection amount through the plug-in type cement injection tool 7 and the cement injector 4;
step S8, from the well head, replacing cement slurry in the small casing 5 of the deflecting section into the annular section by clean water; in the embodiment, the feeding pipe column is put in again, and clear water is injected into the small casing 5 of the deflecting section through the feeding pipe column, so that cement slurry in the small casing 5 of the deflecting section is pushed into the annular section;
step S9, lifting the plug-in cementing tool 7 to the upper part of the releasing joint 6; in this embodiment, in the lifting process, the cement injection pipe of the insertion type cement injection tool 7 is separated from the cement injector 4;
step S10, the feeding pipe column injects clean water into the small casing 5 of the deflecting section, the original well casing discharges the clean water, the well is washed for 2 weeks, and cement above the releasing joint 6 is replaced; in the embodiment, clear water is injected into the small casing 5 of the deflecting section through the feeding pipe column, the clear water is discharged from the casing of the original well, the well is washed for 2 weeks, and cement above the releasing joint 6 is washed out of the well mouth.
S11, squeezing clear water into the original well casing to a certain pressure, closing the casing gate, waiting for setting of cement, and observing pressure change of a pressure gauge during waiting for setting; in the embodiment, the cement in the annular section is compacted by squeezing clean water through the original well casing pipe, and the pressure when the cement is congealed is observed through the pressure gauge outside the small casing pipe 5 of the deflecting section; after the cement is solidified, a cement plug is formed at the bottom end of the small casing 5 at the deflecting section.
Step S12, drilling a cement plug and a blind plate 2; in this embodiment, the drilling from the bottom end of the deflecting section small casing 5 to the deflecting section small casing 5 is performed to communicate the sieve tube 1.
In this embodiment, through screen pipe 1, blind plate 2, bore hole packer 3, cement injector 4, the little sleeve pipe of deflecting section 5, joint 6 is sealed up to deflecting section with bayonet cementing tool 7, control high water flooded layer influence, reduce the influence of the opposite side drilling development of interbedded interference, through the annular space cementing slurry well completion well cementation between the little sleeve pipe of deflecting section 5 and the bore hole well simultaneously, the stability of deflecting section is improved, make partial relatively poor layer remaining oil can be effectively excavated sneak and use.
Referring to fig. 1 and 2, in step S1, the open hole 8 size range is 114-118 mm; in the embodiment, when the size range of the open hole well 8 is 114-118mm, the well completion and cementing effect is better.
Referring to fig. 1 and 2, in step S2, the external diameter of the small casing 5 of the deflecting segment is 88.9mm, and the external diameter of the open hole packer 3 is 105 mm; the outer diameter and the inner diameter of the plug-in cementing tool 7 are 85mm and 52mm respectively; the outer diameter and the inner diameter of the sieve tube 1 are 73mm and 62mm respectively; in the embodiment, when the outer diameter of the open hole packer 3 is 105mm, injected cement can be ensured to enter an annulus between the small casing 5 of the deflecting section and the open hole borehole 8 for cement sealing, and a permeable layer, especially a high water-containing layer, is ensured in the cement entering period; when the outer diameter and the inner diameter of the insertion type cementing tool 7 are 85mm and 52mm respectively, the insertion type cementing tool 7 can be connected with the cannula of the cement injector 4 to provide a passage for injecting cement; the blind plate and the open hole packer 3 can be matched and connected when the outer diameter and the inner diameter of the screen pipe 1 are 73mm and 62mm respectively.
Referring to fig. 1 and 2, in step S5, the inserted cementing tool 7 is run in connection with the cement injector 4; in this embodiment, the slip-in cementing tool 7 is connected to the cement injector 4, and the cement slurry can be injected into the annulus through the slip-in cementing tool 7 and the cement injector 4.
Referring to fig. 1 and 2, in step S7, the designed injection amount of the cement slurry is calculated according to the formula:
determining, wherein H is the length of the deflecting section; in the embodiment, the cement slurry injection amount calculated by the formula is injected, so that the filling injection effect is better.
Referring to fig. 1 and 2, in step S9, the plug-in cementing tool 7 is lifted to 0.8-1.2m above the releasing sub 6; in this embodiment, the insertion cementing tool 7 is lifted to 0.8-1.2m above the release sub 6, so that the insertion cementing tool 7 and the cement injector 4 can be completely separated.
Referring to fig. 1 and 2, in step S11, the pumping pressure of the small casing 5 is 10 Mpa; in the embodiment, the cement paste can be firmly solidified by squeezing with clear water with the pump pressure of 10 Mpa.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A completion process for a deflecting section of an ultra-short radius horizontal well is characterized in that: the method comprises the following steps:
step S1, selecting an ultra-short radius horizontal well with completed borehole construction;
step S2, sequentially connecting a sieve tube (1), a blind plate (2), an open hole packer (3), a cement injector (4), a small casing (5) of a deflecting section, a releasing joint (6) and a feeding pipe column from bottom to top;
s3, the screen pipe (1), the blind plate (2), the open hole packer (3), the cement injector (4), the small casing pipe (5) at the deflecting section, the releasing joint (6) and the sending pipe column which are connected in the step S2 are put into the bottom of the well until the screen pipe (1) completely enters the horizontal section of the horizontal well with the ultra-short radius;
step S4, pulling out the feeding pipe column to a well head;
step S5, inserting the plug-in cementing tool (7);
step S6, feeding the pipe column and injecting clear water to set the open hole packer (3);
step S7, cement paste is squeezed into the annular section according to the designed injection amount through the plug-in type cement injection tool (7) and the cement injector (4);
step S8, from the well head, replacing cement slurry in the small casing (5) of the deflecting section into the annular space section by clean water;
step S9, the plug-in cementing tool (7) is lifted to the upper part of the releasing joint (6);
s10, feeding the pipe column, injecting clear water into the small casing (5) of the deflecting section, discharging the clear water from the original well casing, washing the well for 2 weeks, and replacing the cement above the releasing joint (6);
s11, squeezing clear water into the original well casing to a certain pressure, closing the casing gate, waiting for setting of cement, and observing pressure change of a pressure gauge during waiting for setting;
and step S12, drilling the cement plug and the blind plate (2).
2. The completion process for the deviated section of the ultra-short radius horizontal well as defined in claim 1, wherein: in step S1, the diameter range of the open hole borehole (8) is 114-118 mm.
3. The completion process for the deviated section of the ultra-short radius horizontal well, according to claim 1, is characterized in that: in step S2, the outer diameter of the casing (5) is 88.9mm, and the outer diameter of the open hole packer (3) is 105 mm; the outer diameter and the inner diameter of the plug-in cementing tool (7) are respectively 85mm and 52 mm; the outer diameter and the inner diameter of the sieve tube (1) are 73mm and 62mm respectively.
4. The completion process for the deviated section of the ultra-short radius horizontal well, according to claim 1, is characterized in that: in step S5, the running insertion cementing tool (7) is connected to the cement injector (4).
5. The completion process for the deviated section of the ultra-short radius horizontal well, according to claim 1, is characterized in that: in step S7, the designed injection amount of the cement slurry is calculated according to the formula:
and calculating, wherein H is the length of the deflecting section.
6. The completion process for the deviated section of the ultra-short radius horizontal well, according to claim 1, is characterized in that: in step S9, the insertion cementing tool (7) is lifted 0.8-1.2m above the back-off sub (6).
7. The completion process for the deviated section of the ultra-short radius horizontal well, according to claim 1, is characterized in that: in step S11, the pump pressure when injecting clean water into the small casing (5) of the deflecting section is 10 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210765618.1A CN114991711A (en) | 2022-06-30 | 2022-06-30 | Completion process for deflecting section of horizontal well with ultra-short radius |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210765618.1A CN114991711A (en) | 2022-06-30 | 2022-06-30 | Completion process for deflecting section of horizontal well with ultra-short radius |
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| CN202210765618.1A Pending CN114991711A (en) | 2022-06-30 | 2022-06-30 | Completion process for deflecting section of horizontal well with ultra-short radius |
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Citations (10)
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| US4869323A (en) * | 1988-02-12 | 1989-09-26 | Standard Alaska Production Company | Cementing and rotating an upper well casing attached by swivel to a lower casing |
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| CN101624904A (en) * | 2009-08-14 | 2010-01-13 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof |
| CN201531254U (en) * | 2009-11-04 | 2010-07-21 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Second open hole horizontal well sand prevention well cementation tubular column adopting interpolation method |
| CN101864921A (en) * | 2010-06-11 | 2010-10-20 | 大港油田集团有限责任公司 | Well completion and oil production string of horizontal well and well completion and oil production processes thereof |
| CN102454381A (en) * | 2010-10-22 | 2012-05-16 | 中国石油化工股份有限公司 | Oil-gas reservoir barefoot well cementing and completion method and device |
| CN106948788A (en) * | 2017-03-21 | 2017-07-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of method for implementing secondary well cementation in net horizontal section |
| CN110685658A (en) * | 2019-11-06 | 2020-01-14 | 大庆辰平钻井技术服务有限公司 | Open hole staged fracturing method for ultra-short radius horizontal well |
-
2022
- 2022-06-30 CN CN202210765618.1A patent/CN114991711A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4869323A (en) * | 1988-02-12 | 1989-09-26 | Standard Alaska Production Company | Cementing and rotating an upper well casing attached by swivel to a lower casing |
| CN2310148Y (en) * | 1997-11-25 | 1999-03-10 | 胜利石油管理局采油工艺研究院 | Multi-function completedwell limb for horizontal well |
| CN1508380A (en) * | 2002-12-18 | 2004-06-30 | 杜晓瑞 | Ultrashort curvature leve well drilling and completion method and apparatus thereof |
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| CN201531254U (en) * | 2009-11-04 | 2010-07-21 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Second open hole horizontal well sand prevention well cementation tubular column adopting interpolation method |
| CN101864921A (en) * | 2010-06-11 | 2010-10-20 | 大港油田集团有限责任公司 | Well completion and oil production string of horizontal well and well completion and oil production processes thereof |
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| CN106948788A (en) * | 2017-03-21 | 2017-07-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of method for implementing secondary well cementation in net horizontal section |
| CN110685658A (en) * | 2019-11-06 | 2020-01-14 | 大庆辰平钻井技术服务有限公司 | Open hole staged fracturing method for ultra-short radius horizontal well |
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