CN111852428A - Method for fracturing outer packing and coiled tubing in combined operation - Google Patents
Method for fracturing outer packing and coiled tubing in combined operation Download PDFInfo
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- CN111852428A CN111852428A CN202010766343.4A CN202010766343A CN111852428A CN 111852428 A CN111852428 A CN 111852428A CN 202010766343 A CN202010766343 A CN 202010766343A CN 111852428 A CN111852428 A CN 111852428A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012856 packing Methods 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000005488 sandblasting Methods 0.000 claims description 27
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
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Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of oil-gas field fracturing, and particularly provides a method for fracturing a pipe outer packer and a coiled tubing in a combined manner, which comprises the following steps: a plurality of packers are put in to sectionally pack the exterior of the reservoir pipe column; putting a coiled tubing fracturing string into the sealed reservoir string, and sequentially fracturing the reservoir section by section until fracturing is finished; pulling out the coiled tubing fracturing string; and (5) running a production string and completing the well. The fracturing method solves the abnormal conditions of sand blockage and the like caused by gradual reduction of the drift diameter in a fracturing pipe column and gradual increase of the reducing diameter in the pipe column along with the increase of the number of partial pressure stages in the conventional staged fracturing process. The shaft has full drift diameter, reduces the maintenance and treatment difficulty and operation risk of the shaft in the later period, and is beneficial to the repeated reconstruction in the later period.
Description
Technical Field
The invention belongs to the technical field of oil-gas field fracturing, and particularly relates to a method for fracturing a pipe outer packer and a coiled tubing in a combined manner.
Background
At present, the staged fracturing method of the open hole packer of the horizontal well of the oil and gas field adopts a drill rod to put a staged fracturing tool string once under the condition of the open hole completion of the horizontal section of the horizontal well, a ball-throwing pressurizing setting open hole packer and a hanging packer, a ball-throwing pressurizing or rotating pipe column, a staged fracturing tool string is released, and then a fracturing pipe column is put back to the staged fracturing tool string; pressurizing and opening the first-stage sliding sleeve, performing first-stage fracturing, throwing balls to open the second-stage sliding sleeve after the first-stage construction is finished, performing second-stage fracturing, analogizing in sequence, realizing staged fracturing of the horizontal well under the condition of an immobile pipe column, and finally performing liquid discharge and production and well completion on a combined layer.
The process has multiple stages of partial pressure, gradually increases the drift diameter from bottom to top in the open hole packer, realizes the packing in the pipe by delivering the fracturing balls and sealing the grading ball seats, gradually reduces the drift diameter in the fracturing pipe column along with the increase of the number of stages of the partial pressure, and gradually increases the reducing diameter in the pipe column. If sand blocking and other abnormal conditions occur in the fracturing process, the treatment is difficult, and the construction risk is large. And, because the diameter is changed in the pipe, the later-stage shaft maintenance and repeated reconstruction are influenced.
Disclosure of Invention
The invention provides a fracturing method combining an external packer and a coiled tubing, aiming at overcoming the problems that the inner drift diameter of a fracturing string is gradually reduced along with the increase of the number of stages of partial pressure, the inner diameter of the string is gradually increased, sand blockage and other abnormal conditions occur in the fracturing process, the processing is difficult and the construction risk is large in the prior art; the problem that later-stage shaft maintenance and repeated reconstruction are affected due to the fact that the diameter of the inner pipe is changed in the prior art is solved.
Therefore, the invention provides a method for fracturing by combining an external packer and a coiled tubing, which comprises the following steps:
1) a plurality of packers are put in to sectionally pack the exterior of the reservoir pipe column;
2) putting a coiled tubing fracturing string into the sealed reservoir string, and sequentially fracturing section by section until fracturing is finished;
3) pulling out the coiled tubing fracturing string;
4) and (5) running a production string and completing the well.
Further, the packer is an open hole packer, and the drift diameters of the open hole packers are the same.
Furthermore, the packer needs to be lowered once.
Furthermore, the coiled tubing fracturing string comprises a centralizer and a sand blasting perforation tool, and the lower part of the centralizer is connected with the sand blasting perforation tool.
Furthermore, the coiled tubing fracturing string further comprises a bottom seal packer, and the upper part of the bottom seal packer is connected with a sand blasting perforation tool.
Further, the specific steps of step 2) include: firstly, injecting injection liquid into an oil pipe, and perforating between reservoir pipe columns sealed by two packers by using a sand blasting perforation tool; then, completing single-stage fracturing by adopting a mode of oil pipe injection or oil and sleeve co-injection; and finally, stopping the pump, lifting the coiled tubing fracturing string under pressure, repeating the single-stage fracturing step, and sequentially completing the fracturing of the rest well sections.
Further, the sand blasting perforation tool comprises a plurality of clusters of hydraulic sand blasting perforation tools and a single cluster of hydraulic sand blasting perforation tools.
Furthermore, the perforation between the two packer-sealed reservoir pipe columns is single-cluster perforation by adopting a single-cluster hydraulic sand blasting perforation tool, after the single-cluster perforation, single-section single-cluster fracturing is completed by adopting a mode of oil pipe injection or oil and casing co-injection, then the pipe columns are lifted, the single-cluster perforation and the fracturing are repeated between the two packer-sealed reservoir pipe columns, and multi-cluster transformation between the two packer-sealed reservoir pipe columns is completed.
Further, the sandblasting perforation tool is an injector.
The invention has the beneficial effects that:
1) according to the method for fracturing by combining the external packer and the coiled tubing, the coiled tubing fracturing string (with the bottom packer) is adopted to replace the open hole packer to perform graded ball injection fracturing, so that the risk of inaccurate preset perforation well section of the open hole packer fracturing tool is avoided;
2) according to the method for fracturing by combining the external packing and the coiled tubing, after fracturing is completed, the production tubing string can be put in after the coiled tubing fracturing tubing string is pulled out, and meanwhile, the reverse circulation valve of the coiled tubing fracturing tubing string is used for well washing, so that the method is simple in structure, convenient to operate, low in cost, high in well washing and construction efficiency, good in safety, capable of realizing quick return after fracturing, and avoiding residual fracturing balls and other tools in a well shaft after fracturing;
3) the method for fracturing the outer packer and the coiled tubing in a combined mode comprises the steps of setting an open hole packer with the same drift diameter to complete a well, packing a horizontal section reservoir, carrying out sand blasting and perforation by adopting a coiled tubing fracturing string, lifting a bottom packer step by step under the driving of the coiled tubing fracturing string to perform separation, fracturing the annular space step by step, and completing the drift diameter of a fractured shaft, so that the shaft has the full drift diameter after the reservoir is modified, the difficulty in maintaining and processing the shaft and the operation risk in the later period are reduced, and the later period of repeated modification is facilitated.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an open hole packer section packing reservoir string;
FIG. 2 is a schematic view of a coiled tubing fracturing string
FIG. 3 is a schematic view of a lower open hole packer section packing reservoir string
FIG. 4 is a coiled tubing fracturing string fracturing schematic
FIG. 5 is a schematic illustration of a fractured wellbore after an external pack-off is associated with a coiled tubing fracturing string.
Description of reference numerals: 1. a centralizer; 2. a sand blast perforation tool; 3. a reverse circulation valve; 4. a bottom seal packer; 5. a positioner; 6. a packer; 7. a ball seat; 8. floating hoops; 9. a screen pipe; 10. a guide shoe.
Detailed Description
Example 1:
as shown in fig. 3-5, a method for fracturing by combining an external packer with a coiled tubing comprises the following steps:
1) a plurality of packers 6 are put in to sectionally pack the exterior of the reservoir pipe column;
2) putting a coiled tubing fracturing string into the sealed reservoir string, and sequentially fracturing section by section until fracturing is finished;
3) pulling out the coiled tubing fracturing string;
4) and (5) running a production string and completing the well.
According to the method for fracturing the outer packer and the coiled tubing in the combined mode, the horizontal section reservoir is sealed by setting the open hole packer with the same standard drift diameter, sand blasting and perforating are carried out by adopting the coiled tubing fracturing string, fracturing is carried out section by section in sequence, and the full drift diameter of the shaft is obtained after fracturing, so that the shaft has the full drift diameter after the reservoir is modified, the difficulty in later shaft maintenance and treatment and the operation risk are reduced, later repeated modification is facilitated, quick flowback after fracturing can be realized, and residual fracturing balls and other residual tools in the shaft after fracturing are avoided.
Example 2:
on the basis of the embodiment 1, as shown in fig. 1, the packer 6 is an open hole packer, and the drift diameters of a plurality of open hole packers are the same. The open hole packer is used for sectionally packing the outside of the reservoir pipe column, the packer further comprises a ball seat 9, a floating hoop 10, a sieve pipe 11 and a guide shoe 12 during packing, and the open hole packer, the ball seat 9, the floating hoop 10, the sieve pipe 11 and the guide shoe 12 are sequentially connected. Open hole packers with the same specification drift diameter are put in for well completion, and horizontal section reservoirs are sealed and isolated, so that the specification is uniform, and the cost is reduced; furthermore, the open hole packer is K344, K341 and K342, has better sealing performance in field application, and can carry out pretreatment construction on the stratum by large-displacement forward and reverse displacement mud, well washing and the like; the open hole packer is easy to set and unset, can resist high temperature of 125-.
Further, the packer 6 needs to be lowered once. The packer is put into at one time, so that the later fracturing is facilitated, and the construction efficiency is improved.
As shown in fig. 2, further, the coiled tubing fracturing string comprises a centralizer 1 and a sand blasting perforation tool 2, wherein the centralizer 1 is connected with the sand blasting perforation tool 2. The centralizer 1 ensures that an oil pipe is placed in the middle when fracturing, reduces the eccentric wear phenomenon, reduces the friction damage of the well wall to a packer rubber sleeve, prolongs the service life of the packer, and has the advantages of simple structure, flexible rotation, small friction force and good centralizing effect.
Further, the coiled tubing fracturing string further comprises a bottom seal packer 4, and the left side of the bottom seal packer 4 is connected with the sand blasting perforation tool 2. The coiled tubing fracturing string with the bottom seal packer is adopted to replace the open hole packer to perform graded ball injection fracturing, so that the risk of inaccurate perforation well section preset by the open hole packer fracturing tool is avoided.
Further, the specific steps of step 2) include: firstly, injecting injection liquid into an oil pipe, and perforating between reservoir pipe columns sealed by two packers through a sand blasting perforation tool 2; then, completing single-stage fracturing by adopting a mode of oil pipe injection or oil and sleeve co-injection; and finally, stopping the pump, lifting the coiled tubing fracturing string under pressure, repeating the single-stage fracturing step, and sequentially completing the fracturing of the rest well sections. Adopt 2 sandblast perforation of sandblast perforation instrument, the bottom seal packer lifts step by step under coiled tubing drives and implements the separation, and the annular space is fracturing step by step, and the full latus rectum of pit shaft after the pressure reduces later stage pit shaft maintenance and handles degree of difficulty and operation risk, does benefit to later stage repeated transformation.
Further, the sand-blast perforating tool 2 comprises a plurality of clusters of hydraulic sand-blast perforating tools and a single cluster of hydraulic sand-blast perforating tools. Furthermore, the perforation between the two packer-sealed reservoir pipe columns is single-cluster perforation by adopting a single-cluster hydraulic sand blasting perforation tool, after the single-cluster perforation, single-section single-cluster fracturing is completed by adopting a mode of oil pipe injection or oil and casing co-injection, then the pipe columns are lifted, the single-cluster perforation and the fracturing are repeated between the two packer-sealed reservoir pipe columns, and multi-cluster transformation between the two packer-sealed reservoir pipe columns is completed. The method is selected according to the needs, multi-cluster fracturing reconstruction is achieved, adaptability is high, and selection can be performed according to the needs.
Further, the sandblasting perforation tool 2 is an injector. The ejector has the advantages of small volume, light weight, compact structure, higher efficiency, investment saving, simple operation and convenient maintenance.
Further, the coiled tubing fracturing string further comprises a reverse circulation valve 3, and the sand blasting perforation tool 2 and the bottom sealing packer 4 are connected through the reverse circulation valve 3; the reverse circulation valve 3 is convenient for well washing and has the characteristics of simple structure, convenient operation, low cost, high construction success rate, good safety and the like.
Further, the coiled tubing fracturing string further comprises a positioner 5, and a bottom seal packer 4 is connected with the positioner 5 on the right; the positioner 5 is convenient for accurately setting the coiled tubing fracturing string into the position of the reservoir string to be fractured, and improves the fracturing accuracy.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, if any, refer to an orientation or positional relationship based on that shown in the drawings, and do not refer to or imply that the referred devices or elements must have a particular orientation, configuration, and operation in a particular orientation, and thus, the terms describing a positional relationship in the drawings are used for illustrative purposes only and are not to be construed as limiting the present patent.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. A method for fracturing a pipe outer packer and a coiled tubing in a combined manner is characterized by comprising the following steps: the method comprises the following steps:
1) a plurality of packers (6) are put in to sectionally pack the outside of the reservoir pipe column;
2) putting a coiled tubing fracturing string into the sealed reservoir string, and sequentially fracturing section by section until fracturing is finished;
3) pulling out the coiled tubing fracturing string;
4) and (5) running a production string and completing the well.
2. The pipe outer packing and coiled tubing combined fracturing method of claim 1, wherein: the packer (6) is an open hole packer, and the drift diameters of a plurality of open hole packers are the same.
3. The pipe outer packing and coiled tubing combined fracturing method of claim 1, wherein: the packer (6) needs to be put in at one time.
4. The pipe outer packing and coiled tubing combined fracturing method of claim 1, wherein: the coiled tubing fracturing string comprises a centralizer (1) and a sand blasting perforation tool (2), wherein the lower part of the centralizer (1) is connected with the sand blasting perforation tool (2).
5. The pipe outer packing and coiled tubing combined fracturing method of claim 4, wherein: the coiled tubing fracturing string further comprises a bottom seal packer (4), and the upper part of the bottom seal packer (4) is connected with the sand blasting perforation tool (2).
6. The pipe outer packing and coiled tubing combined fracturing method of claim 5, wherein: the specific steps of the step 2) comprise: firstly, injecting injection liquid into an oil pipe, and perforating between reservoir pipe columns sealed by two packers through a sand blasting perforation tool (2); then, completing single-stage fracturing by adopting a mode of oil pipe injection or oil and sleeve co-injection; and finally, stopping the pump, lifting the coiled tubing fracturing string under pressure, repeating the single-stage fracturing step, and sequentially completing the fracturing of the rest well sections.
7. The pipe outer packing and coiled tubing combined fracturing method of claim 6, wherein: the sand blasting and perforating tool (2) comprises a plurality of clusters of hydraulic sand blasting and perforating tools and a single cluster of hydraulic sand blasting and perforating tools.
8. The pipe outer packing and coiled tubing combined fracturing method of claim 7, wherein: the perforation between the reservoir pipe columns sealed by the two packers (6) by adopting the single-cluster hydraulic sand-blasting perforation tool is single-cluster perforation, after the single-cluster perforation, single-section single-cluster fracturing is completed by adopting a mode of oil pipe injection or oil and casing co-injection, then the pipe columns are lifted, the single-cluster perforation and the fracturing are repeated between the reservoir pipe columns sealed by the two packers (6), and multi-cluster transformation between the reservoir pipe columns sealed by the two packers (6) is completed.
9. The pipe outer packing and coiled tubing combined fracturing method of claim 7, wherein: the sand blasting perforation tool (2) is an ejector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766343.4A CN111852428A (en) | 2020-08-03 | 2020-08-03 | Method for fracturing outer packing and coiled tubing in combined operation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010766343.4A CN111852428A (en) | 2020-08-03 | 2020-08-03 | Method for fracturing outer packing and coiled tubing in combined operation |
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| CN111852428A true CN111852428A (en) | 2020-10-30 |
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| CN202010766343.4A Pending CN111852428A (en) | 2020-08-03 | 2020-08-03 | Method for fracturing outer packing and coiled tubing in combined operation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211601A (en) * | 2020-11-05 | 2021-01-12 | 中国石油天然气股份有限公司 | Coiled tubing and packer combined staged fracturing string for slim-hole well and method |
| CN112267866A (en) * | 2020-11-05 | 2021-01-26 | 中国石油天然气股份有限公司 | Small-diameter pipe staged fracturing production pipe column and method for side drilling well and small-hole well |
| CN112324415A (en) * | 2020-11-05 | 2021-02-05 | 中国石油天然气股份有限公司 | Combined segmented reconstruction method for selective repeated reconstruction of old well |
| CN112901131A (en) * | 2021-02-20 | 2021-06-04 | 中海油能源发展股份有限公司 | Staged fracturing process pipe column for loose sandstone in-service screen pipe sand-prevention horizontal well and operation method |
| RU2774455C1 (en) * | 2021-11-09 | 2022-06-21 | Николай Маратович Шамсутдинов | Method for completing a well with a horizontal completion using a production column of one diameter from head to bottomhouse and subsequent carrying out large-volume, speed and multi-stage hydraulic fracturing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211601A (en) * | 2020-11-05 | 2021-01-12 | 中国石油天然气股份有限公司 | Coiled tubing and packer combined staged fracturing string for slim-hole well and method |
| CN112267866A (en) * | 2020-11-05 | 2021-01-26 | 中国石油天然气股份有限公司 | Small-diameter pipe staged fracturing production pipe column and method for side drilling well and small-hole well |
| CN112324415A (en) * | 2020-11-05 | 2021-02-05 | 中国石油天然气股份有限公司 | Combined segmented reconstruction method for selective repeated reconstruction of old well |
| CN112211601B (en) * | 2020-11-05 | 2022-08-30 | 中国石油天然气股份有限公司 | Coiled tubing and packer combined staged fracturing string for slim-hole well and method |
| CN112267866B (en) * | 2020-11-05 | 2022-11-04 | 中国石油天然气股份有限公司 | Small-diameter pipe staged fracturing production pipe column and method for side drilling well and small-hole well |
| CN112901131A (en) * | 2021-02-20 | 2021-06-04 | 中海油能源发展股份有限公司 | Staged fracturing process pipe column for loose sandstone in-service screen pipe sand-prevention horizontal well and operation method |
| CN112901131B (en) * | 2021-02-20 | 2022-07-22 | 中海油能源发展股份有限公司 | Staged fracturing process pipe column for loose sandstone in-service screen pipe sand-prevention horizontal well and operation method |
| RU2774455C1 (en) * | 2021-11-09 | 2022-06-21 | Николай Маратович Шамсутдинов | Method for completing a well with a horizontal completion using a production column of one diameter from head to bottomhouse and subsequent carrying out large-volume, speed and multi-stage hydraulic fracturing |
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