CN111997578A - Well completion device and method for horizontal well repeated fracturing - Google Patents
Well completion device and method for horizontal well repeated fracturing Download PDFInfo
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- CN111997578A CN111997578A CN201910444219.3A CN201910444219A CN111997578A CN 111997578 A CN111997578 A CN 111997578A CN 201910444219 A CN201910444219 A CN 201910444219A CN 111997578 A CN111997578 A CN 111997578A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000725 suspension Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 206010017076 Fracture Diseases 0.000 description 5
- 208000010392 Bone Fractures Diseases 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000754 repressing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention provides a well completion device and a method for horizontal well repeated fracturing, wherein the well completion device for horizontal well repeated fracturing comprises the following components: the device comprises a sleeve, a hanging tail pipe and a plugging head; one end of the hanging tail pipe is hung at the heel part of the horizontal section in the sleeve; the plugging head is arranged at the other end of the suspended tail pipe to plug the suspended tail pipe, and a perforating device is arranged in the suspended tail pipe in a well completion operation to perforate the casing and/or the suspended tail pipe. According to the invention, the suspended tail pipe is arranged in the pipe sleeve, so that the existing perforation hole but the interval which is not modified can be subjected to repeated fracturing, the problem of sectional repeated fracturing of the existing horizontal well is solved, the repeated fracturing with larger displacement volume is realized, the single well yield is improved, the measure cost is reduced, and the repeated fracturing effect and the final oil field recovery ratio are improved.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a well completion device and method for horizontal well repeated fracturing.
Background
Nowadays, most horizontal wells are subjected to production increasing measures in the early stage, the yield of a single well is improved, but under the influence of factors such as well completion technology development and the like, the horizontal well section still keeps an unmodified state, oil and gas are only produced from the modified section, and the production degree of the unmodified section is possibly obviously lower than that of the modified section. Therefore, after the primary fracture acidizing, the yield gradually decreases after a period of production, and the non-fractured and acidized intervals or the intervals with insufficient primary fracture acidizing may need to be repeatedly transformed, so that the yield and the production degree are improved. However, initial completion results in casing that has already been staged and perforated with multiple perforations and produced, and it is very difficult to effectively stimulate an interval that has not been modified with existing perforations. There is a need for improved completion methods for recompleting a fractured well bore.
At present, the domestic modes for horizontal well repeated fracturing completion mainly comprise four modes: one is to adopt the mode of dynamic multistage temporary plugging, through the optimal design pump injection procedure, utilize degradable material shutoff to reform transform the interval after, the new crack of repressing, this mode has been used for unconventional horizontal well repeated fracturing, but the extensive condition that has the shutoff to become invalid or not successfully the shutoff in the actual work progress leads to repeated fracturing technology failure. The other is a double-sealing single-clamping technology, which accurately clamps and aims at the target interval which is not transformed to carry out transformation measures by putting an oil pipe with a packer, but has the disadvantages of complex process, limited displacement due to the influence of a construction pipe column, long operation time, long time consumption of matched operation and high cost. Thirdly, foreign liquid rubber plug technology is introduced, namely an oil pipe is put into a casing of the horizontal well, a liquid rubber plug is injected into the oil pipe, the liquid rubber plug is filled with the annular space and is solidified in a circulating mode of the annular space between the oil pipe and the casing, so that the whole well section is effectively blocked, the repeated fracturing is facilitated, but the repeated fracturing measures are carried out in a mode of injecting the oil pipe by the aid of the oil pipe which is put into the whole well section, and construction discharge capacity is limited; and fourthly, introducing a foreign expansion pipe technology, namely putting an expansion pipe in, and forcing the expansion pipe to expand and tightly attach to the sleeve by adopting hydraulic pressure and other modes when the well section needs to be plugged so as to realize effective plugging, but the method is not beneficial to economic and effective repeated fracturing of a low-permeability old area or a compact oil area.
Disclosure of Invention
The invention provides a well completion device and method for horizontal well repeated fracturing, which aims to effectively increase the production of an interval which is not reformed through existing perforation holes.
In a first aspect, the present invention provides a completion apparatus for horizontal well re-fracturing, comprising: the device comprises a sleeve, a hanging tail pipe and a plugging head;
one end of the hanging tail pipe is hung at the heel of the horizontal section in the sleeve;
the plugging head is arranged at the other end of the suspended tail pipe to plug the suspended tail pipe, and a perforating device is arranged in the suspended tail pipe in a well completion operation to perforate the casing and/or the suspended tail pipe.
Further, the well completion device for horizontal well repeated fracturing further comprises: a voltage divider;
the pressure divider is arranged in the suspension tail pipe and used for plugging a fractured well section.
Further, the well completion device for horizontal well repeated fracturing further comprises: a packer;
one end of the hanging tail pipe is hung in the casing through the packer.
Further, an annular space is formed between the outer wall of the hanging tail pipe and the inner wall of the casing.
Further, the annular space contains cement or a degradable fluid therein.
Further, the voltage dividing device includes: the bridge plug and the continuous oil pipe are provided with bottom seals.
Further, the hanging tailpipe is composed of butted tailpipe sections.
Further, the hanging liner is comprised of a liner section of the flow control completion.
In a second aspect, the present invention provides a method for completing a horizontal well through repeated fracturing, wherein the method is completed by using the completion device for horizontal well repeated fracturing, and comprises the following steps:
placing the hanging liner into the casing;
placing a perforating device into the suspended tail pipe, and perforating the suspended tail pipe and/or the casing pipe by using the perforating device;
pumping a fracturing fluid into the formation through the perforations;
and the formation oil gas enters the suspended tail pipe through the holes to be produced.
Further, placing a perforating device into the hanging liner, perforating the hanging liner and/or casing with the perforating device to form perforations comprising:
if the casing has the holes, only the hanging tail pipe is perforated, and if the casing does not have the holes, the hanging tail pipe and the casing are perforated at the same time.
According to the invention, the suspended tail pipe is arranged in the pipe sleeve, so that the existing perforation hole but the interval which is not modified can be subjected to repeated fracturing, the problem of sectional repeated fracturing of the existing horizontal well is solved, the volume repeated fracturing under large displacement is realized, the single well yield is improved, the measure cost is reduced, and the repeated fracturing effect and the final oil field recovery ratio are improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a well completion device for horizontal well repeated fracturing provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of a well completion method for horizontal well repeated fracturing provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The production increasing measures are carried out in the early stage of most of existing horizontal wells, the yield of a single well is improved, but under the influence of factors such as well completion technology development and the like, the horizontal well part layer section still keeps an unmodified state, oil gas is only extracted from the modified layer section, and the extraction degree of the layer section which is not modified is possibly obviously lower than that of the modified layer section. Therefore, after the primary fracture acidizing, the yield gradually decreases after a period of production, and the non-fractured and acidized intervals or the intervals with insufficient primary fracture acidizing may need to be repeatedly transformed, so that the yield and the production degree are improved. However, the initial completion causes the casing to be segmented and have multiple shooting holes and produce, and the stimulation of the non-transformed interval through the existing perforation holes is difficult to effectively carry out stimulation, and in order to solve the problems, the embodiment of the invention provides a completion device and a method for horizontal well repeated fracturing.
The embodiment of the invention provides a well completion device for horizontal well repeated fracturing, which comprises: the device comprises a sleeve, a hanging tail pipe and a plugging head;
one end of the hanging tail pipe is hung at the heel part of the horizontal section in the sleeve;
the plugging head is arranged at the other end of the suspended tail pipe to plug the suspended tail pipe, and a perforating device is arranged in the suspended tail pipe in a well completion operation to perforate the casing and/or the suspended tail pipe.
Specifically, as shown in fig. 1, fig. 1 is a schematic structural diagram of a completion device for horizontal well repeated fracturing provided by an embodiment of the present invention. The completion apparatus for horizontal well re-fracturing in the figure comprises: the device comprises a casing 1, a hanging tail pipe 2 and a plugging head 3, wherein the cross section of the hanging tail pipe 2 can be constant and consistent and can also be gradually changed; the outer diameter or the cross-sectional area of the tail end part of the suspension tail pipe 2 is smaller than that of the upper end of the suspension tail pipe, and the outer diameter or the cross-sectional area of the tail end part of the suspension tail pipe can be realized by changing the wall thickness of the pipe wall or by coatings with different thicknesses, and the inner diameter of the suspension tail pipe is required to be kept unchanged or is kept approximately unchanged no matter how the outer diameter of. The casing 1 is the original casing of the horizontal well, and the pipe diameter is generally 5.5 inches.
As shown in fig. 1, a hanging liner 2 is put into a horizontal wellbore casing 1, the straight wellbore section is the original casing, the liner is hung at the heel of the horizontal section, and a liner channel is formed for repeated fracturing measures; and a plugging head 3 is arranged at the other end of the hanging tail pipe and is used for plugging the hanging tail pipe. In the well completion operation, the casing 1 and/or the hanging tail pipe 2 are perforated by the perforating device 4 by running the perforating device 4 in the hanging tail pipe 2, and fracturing fluid is pumped into the stratum through the perforations to perform repeated fracturing. Wherein, two perforation modes can be optimized according to the reconstruction interval: as reference numeral 8 in fig. 1: if the casing does not have the perforation, perforating the suspension tail pipe and the casing at the same time; as reference numeral 9 in fig. 1: the corresponding casing pipe is provided with holes, and only the hanging tail pipe is perforated.
It should be noted that, in the embodiment of the present invention, the construction pipe column is a straight well original casing (casing 1) + a horizontal well tail pipe (hanging tail pipe 2), the pipe diameter is greater than the pipe diameter of the oil pipe, the injection friction resistance is the sum of the friction resistance of the straight well casing and the friction resistance of the horizontal tail pipe, the construction displacement can be optimized according to the actual pipe diameters of the casing and the tail pipe, the higher construction displacement required by volume fracturing is ensured, and the effect of large displacement can be realized.
According to the embodiment of the invention, the suspended tail pipe is arranged in the pipe sleeve, so that the existing perforation hole but the interval which is not reformed can be subjected to repeated fracturing, the problem of sectional repeated fracturing of the existing horizontal well is solved, the repeated fracturing with larger displacement volume is realized, the yield of a single well is improved, the measure cost is reduced, and the repeated fracturing effect and the final oil recovery rate of an oil field are improved.
Based on the content of the above embodiments, as an alternative embodiment: the well completion device for horizontal well repeated fracturing further comprises: a voltage divider;
the pressure divider is arranged in the suspension tail pipe and used for plugging the fractured well section.
Specifically, as shown in fig. 1, a partial pressure device 5 is arranged in the suspended tail pipe 2 and used for repeatedly fracturing partial pressure and plugging a fractured well section.
Based on the content of the above embodiments, as an alternative embodiment: the well completion device for horizontal well repeated fracturing further comprises: a packer;
one end of the hanging tail pipe is hung in the sleeve through a packer.
Specifically, as shown in fig. 1, the packer 6 is attached to the front end of the string of hanging liner 2 for fixing the hanging liner 2 to the casing 1.
According to the embodiment of the invention, the packing device is arranged at the upper part of the suspension tail pipe and used for fixing the suspension tail pipe so as to stably keep the tail pipe.
Based on the content of the above embodiments, as an alternative embodiment: an annular space is formed between the outer wall of the hanging tail pipe and the inner wall of the sleeve.
Specifically, as shown in fig. 1, an annular space 7 is formed between the outer wall of the hanging liner 2 and the inner wall of the casing 1 by arranging a packer 6 between the hanging liner 2 and the casing 1.
Based on the content of the above embodiments, as an alternative embodiment: the annular space contains cement or a degradable fluid therein.
Specifically, before the repeated fracturing measures, the annular space between the casing and the tail pipe can be permanently plugged by pouring cement into the annular space 7; or other cross-linkable and solidified materials are poured to temporarily block the annulus, the annulus is broken or degraded after measures are taken, the blocking is removed, and the flow of the fluid in the annulus is controlled to generate the flow restriction or avoid the flow restriction.
According to the embodiment of the invention, cement or other crosslinkable, curable and degradable materials are injected into the annular space, so that the fracturing fluid is prevented from flowing into the annular space when fracturing is carried out.
Based on the content of the above embodiments, as an alternative embodiment: the voltage divider includes: the bridge plug and the continuous oil pipe are provided with bottom seals.
Specifically, the pressure dividing device in the embodiment of the present invention may be a bridge plug, a coiled tubing with a bottom seal, and the like, and it should be noted that the pressure dividing device is not specifically limited in the embodiment of the present invention.
Based on the content of the above embodiments, as an alternative embodiment: the hanging tail pipe is composed of butt jointed tail pipe sections.
Specifically, the hanging tail pipe 2 can be composed of a series of tail pipe sections which are effectively butted; or a tailpipe section butt-joined to a connection or flow control device to form a suspended tailpipe 2.
According to another aspect of the present invention, embodiments of the present invention further provide a horizontal well re-fracturing completion method, which completes a well by using the horizontal well re-fracturing completion device described in the above embodiments, as shown in fig. 2, and the method includes:
s101, placing a suspension tail pipe into a sleeve;
s102, placing the perforating device into the suspended tail pipe, and perforating the suspended tail pipe and/or the casing pipe by using the perforating device;
s103, injecting fracturing fluid into the formation pump through the holes;
and S104, allowing the formation oil gas to enter the suspended tail pipe through the holes to be produced.
Specifically, a hanging tail pipe is arranged in a pipe sleeve, and the pipe sleeve and the hanging tail pipe are connected through a packer to form a construction pipe column. And (3) placing an injection hole device in the suspension tail pipe to form holes for injection holes of the suspension tail pipe and/or the casing, injecting fracturing fluid into the formation pump through the tail pipe holes and the casing hole patching holes by perforating the suspension tail pipe and the corresponding casing, and performing repeated fracturing. Formation hydrocarbons may be produced through perforations into a suspended liner wellbore due to fractures in the formation near the bottom of the well. The well completion method for horizontal well repeated fracturing provided by the embodiment of the invention is suitable for horizontal well repeated fracturing of low-permeability and compact reservoirs.
According to the embodiment of the invention, the suspended tail pipe is arranged in the pipe sleeve, so that the existing perforation hole but the interval which is not reformed can be subjected to repeated fracturing, the problem of sectional repeated fracturing of the existing horizontal well is solved, the repeated fracturing with larger displacement volume is realized, the yield of a single well is improved, the measure cost is reduced, and the repeated fracturing effect and the final oil recovery rate of an oil field are improved.
Based on the content of the above embodiments, as an alternative embodiment: placing a perforating device into the hanging liner and perforating the hanging liner and/or the casing with the perforating device to form a perforation comprising:
if the casing has the holes, only the hanging tail pipe is perforated, and if the casing does not have the holes, the hanging tail pipe and the casing are perforated at the same time.
Specifically, two perforation modes can be optimized according to the modified interval: as reference numeral 8 in fig. 1: if the casing does not have the perforation, perforating the suspension tail pipe and the casing at the same time; as reference numeral 9 in fig. 1: the casing has perforations and only the hanging liner is perforated.
The embodiment of the invention provides two perforation modes, and a proper perforation mode can be selected according to the actual condition of the reformed interval in the specific implementation stage, so that the yield and the production degree are improved.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A completion apparatus for horizontal well re-fracturing, comprising: the device comprises a sleeve, a hanging tail pipe and a plugging head;
one end of the hanging tail pipe is hung at the heel of the horizontal section in the sleeve;
the plugging head is arranged at the other end of the suspended tail pipe to plug the suspended tail pipe, and a perforating device is arranged in the suspended tail pipe in a well completion operation to perforate the casing and/or the suspended tail pipe.
2. The horizontal well re-fracturing completion apparatus of claim 1, further comprising: a voltage divider;
the pressure divider is arranged in the suspension tail pipe and used for plugging a fractured well section.
3. The horizontal well re-fracturing completion apparatus of claim 1, further comprising: a packer;
one end of the hanging tail pipe is hung in the casing through the packer.
4. The completion apparatus for horizontal well re-fracturing as recited in claim 3 wherein an annular space is formed between the outer wall of the hanging liner and the inner wall of the casing.
5. Completion apparatus for horizontal well re-fracturing according to claim 4, wherein said annular space contains cement or a degradable fluid therein.
6. Completion apparatus for horizontal well re-fracturing according to claim 2, wherein the pressure-dividing apparatus comprises: and (4) a bridge plug.
7. The completion apparatus for horizontal well re-fracturing of claim 1 wherein the hanging liner is comprised of abutting liner sections.
8. The completion apparatus for horizontal well re-fracturing of claim 1, wherein the hanging liner is comprised of a liner section of a flow control completion apparatus.
9. A method of completing a horizontal well through re-fracturing, the method completed using the completion apparatus of claim 1, the method comprising:
placing the hanging liner into the casing;
placing a perforating device into the suspended tail pipe, and perforating the suspended tail pipe and/or the casing pipe by using the perforating device;
pumping a fracturing fluid into the formation through the perforations;
and the formation oil gas enters the suspended tail pipe through the holes to be produced.
10. The method of claim 9, wherein placing a perforating device into the hanging liner, perforating the hanging liner and/or casing with the perforating device to form perforations comprises:
if the casing has the holes, only the hanging tail pipe is perforated, and if the casing does not have the holes, the hanging tail pipe and the casing are perforated at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910444219.3A CN111997578A (en) | 2019-05-27 | 2019-05-27 | Well completion device and method for horizontal well repeated fracturing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910444219.3A CN111997578A (en) | 2019-05-27 | 2019-05-27 | Well completion device and method for horizontal well repeated fracturing |
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| CN111997578A true CN111997578A (en) | 2020-11-27 |
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| CN201910444219.3A Pending CN111997578A (en) | 2019-05-27 | 2019-05-27 | Well completion device and method for horizontal well repeated fracturing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991732A (en) * | 2021-03-02 | 2022-09-02 | 中国石油化工股份有限公司 | Method for improving residual potential of shale gas horizontal well section cluster |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991732A (en) * | 2021-03-02 | 2022-09-02 | 中国石油化工股份有限公司 | Method for improving residual potential of shale gas horizontal well section cluster |
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Application publication date: 20201127 |