CN106481322A - A kind of method that expansion expands borehole aperture in included gas - Google Patents
A kind of method that expansion expands borehole aperture in included gas Download PDFInfo
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- CN106481322A CN106481322A CN201510531844.3A CN201510531844A CN106481322A CN 106481322 A CN106481322 A CN 106481322A CN 201510531844 A CN201510531844 A CN 201510531844A CN 106481322 A CN106481322 A CN 106481322A
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- borehole
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Abstract
The present invention provides a kind of method that expansion expands borehole aperture in included gas.Its technical scheme is：Using with pressurization and reduction of blood pressure in high-speed function tubing string string, pressurizeed to shaft bottom by well head and persistently inject resiliency compressible gas, realize shaft bottom and the borehole interior pressurization of blowhole nearby and shaft bottom reduction of blood pressure in high-speed, gas decompressional expansion, and gas is slow in blowhole internal ratio shaft bottom big gun ophthalmic flow, it is little that blowhole internal gas pressure reduces amplitude, it is poor that gas high pressure is formed in blowhole near borehole wall between borehole, gas high pressure difference produces impetus power by borehole surface rock cement loose, and loose rock residue is discharged borehole with stratum toward the flowing in pit shaft, so as to expand borehole aperture, reduce fluid flow resistance, realize oil well production increasing.
Description
Technical field
The present invention relates to expansion expands the side in borehole aperture in oil-gas field development field, more particularly to a kind of included gas
Method.
Background technology
In oil well production process, crude oil is flowed to behind near wellbore zone from stratum Yuan Jing area, flows into pit shaft from perforation holes.
Most of oil well outputs are low at present, and a big chunk reason is perforation holes surface contamination, borehole aperture is little causes crude stream
Dynamic resistance is big.Therefore, a kind of method for reducing borehole flow resistance is needed during exploitation of oil-gas field, at present conventional reduction
Borehole resistance method mainly has acidifying etc., but the problems such as acidifying presence pollution environment, corrosion oil annular pipe, harm personnel health.
Therefore, this area needs a kind of safety and environmental protection, the technology of free from corrosion reduction borehole resistance, thus proposes a kind of rock pore
The method that expansion expands borehole aperture in gap gas.
Content of the invention
It is an object of the invention to provide expansion expands perforation holes aperture approach in a kind of included gas, it is possible to increase
Borehole permeability, reduces fluid flow resistance.
In order to achieve the above object, the present invention is adopted the following technical scheme that：In a kind of included gas, expansion expands borehole
The method in aperture, the method are utilized with pressurization and reduction of blood pressure in high-speed function tubing string string, are pressurizeed by well head and are persistently noted to shaft bottom
Enter resiliency compressible gas, shaft bottom and the borehole interior pressurization of blowhole nearby and shaft bottom reduction of blood pressure in high-speed is realized, gas step-down is swollen
Swollen, and gas is slow in blowhole internal ratio big gun ophthalmic flow, in blowhole, gas Amplitude of Hypotensive is little, near borehole wall
Gas high pressure is formed in blowhole and borehole between poor, the poor impetus power that produces of gas high pressure is by borehole surface rock glue
Knot thing loose, and loose rock is discharged borehole with stratum toward the flowing in pit shaft, so as to expand borehole aperture,
Reduce fluid flow resistance, realize oil well production increasing.
Described with pressurization and reduction of blood pressure in high-speed function tubing string string mainly by oil pipe, choke valve, reduction of blood pressure in high-speed device, capsule
Packer, reduction of blood pressure in high-speed device, constant pressure valve are sequentially connected composition.
Wherein, the reduction of blood pressure in high-speed device is the pipe nipple for having through hole on tube wall, and the pipe nipple is provided with pressure control film, institute
Through hole is stated by pressure control diaphragm seal, the pressurized rear to a certain extent moment rupture of the pressure control film, the pressurized big I of the film set
Fixed.
Further, the interior pressurization of blowhole nearby of the shaft bottom and borehole and shaft bottom reduction of blood pressure in high-speed are realized in：
(1) oil jacket annular space is closed, by gas injection of pressurizeing into tubing string, as level pressure valve action makes to form pressure in tubing string string
Difference, packing element expansion are setting, insulate shaft bottom and oil jacket annular space, and rock near shaft bottom and borehole is realized in persistent pressure gas injection
Pressurization in stone hole.
(2) be vented in oil jacket annular space, tubing string and pressure differential is formed and annular space between, above the pressure differential is more than packer
Reduction of blood pressure in high-speed device in pressure control film pressure-bearing value when, pressure control film breaks, is connected by through hole with oil jacket annular space in tubing string,
Through choke valve metering function, realize pressure in tubing string and reduce rapidly.
(3) reduced pressure in tubing string, constant pressure valve are closed, and form pressure differential, the pressure differential in tubing string and shaft bottom between
When setting pressure-bearing value more than pressure control film in reduction of blood pressure in high-speed device below inflatable packer, pressure control film breaks, gas is from glue
Below capsule packer, the through hole of reduction of blood pressure in high-speed device is entered in tubing string, then from above inflatable packer reduction of blood pressure in high-speed device logical
Hole spills into annular space, realizes shaft bottom reduction of blood pressure in high-speed.
The method that expansion expands borehole aperture in the included gas that the present invention is provided, enters down first with pressurization and fast
Fast buck functionality tubing string string, the tubing string string is by oil pipe, choke valve, reduction of blood pressure in high-speed device, inflatable packer, reduction of blood pressure in high-speed
Device, constant pressure valve are sequentially connected composition, subsequently the pressurization injection resiliency compressible gas from well head to shaft bottom, by constant pressure valve
Effect makes to form pressure reduction in tubing string, and packing element expansion is setting, insulates shaft bottom and oil jacket annular space, realizes shaft bottom and borehole
Pressurization in blowhole nearby, then persistent pressure gas injection, by two reduction of blood pressure in high-speed devices of inflatable packer upper and lower
Middle pressure control film successively ruptures, and opens the through hole of upper and lower two reduction of blood pressure in high-speed devices, connected well bottom and oil jacket annular space, real
Existing shaft bottom and borehole reduction of blood pressure in high-speed, finally in blowhole near borehole wall, formation gas high pressure is poor between borehole, gas
Body High Pressure Difference produces impetus power by borehole surface rock cement loose, and will toward the flowing in pit shaft by stratum
Loose rock discharges borehole, so as to expand borehole aperture.
Description of the drawings：
The following drawings is only intended to do schematic illustration and explanation to the present invention, not delimit the scope of the invention, wherein：
Fig. 1：Gas injection tube column string schematic diagram
Fig. 2：Pressure schematic diagram near borehole wall
Specific embodiment
The method that expansion expands borehole aperture in the included gas that the present invention is provided, using pressurization and reduction of blood pressure in high-speed device
Tubing string string, the tubing string string is mainly by oil pipe 1, choke valve 2, reduction of blood pressure in high-speed device 3, inflatable packer 4, reduction of blood pressure in high-speed
Device 5, constant pressure valve 6 are sequentially connected composition.Wherein, reduction of blood pressure in high-speed device 3 and 5 is the pipe nipple for having through hole on tube wall,
The pipe nipple is provided with pressure control film 7 and 8, and the pressure-bearing size pressable power of pressure control film 7 and 8 requires to set.
In the included gas that the present invention is provided, the method in expansion expansion borehole aperture is implemented, and enters down first
With pressurization and reduction of blood pressure in high-speed function tubing string string, close oil jacket annular space 10, subsequently with pressurization gas injection device 9 from well head to
Resiliency compressible gas 12 is injected in shaft bottom, and gas 12 makes to form pressure in tubing string by the fixed poor depressurization of constant pressure valve 6
Difference (if remaining 3 MPas of pressure reduction between constant pressure valve import and outlet), the packing element internal pressure in inflatable packer 4
Power expands setting, packing shaft bottom and oil jacket annular space 10 more than annular pressure, persistent pressure gas injection for a period of time, gas
12 penetrate near borehole near wellbore zone blowhole 13, realize the interior pressurization of blowhole 13 nearby of borehole 11；Then
Emptying oil jacket annular space 10, in annular space, pressure is reduced to atmospheric pressure, and persistent pressure gas injection, when in tubing string, pressure is more than quickly
On dropping equipment 3 during the setting pressure-bearing value of pressure control film 7, pressure control film 7 ruptures, and tubing string is with oil jacket annular space 10 by fast
Through hole connection on prompt drop pressure device 3, through 2 metering function of choke valve, in tubing string, gas 12 is from reduction of blood pressure in high-speed device 3
Tube wall through hole quickly escape into oil jacket annular space 10, in tubing string, pressure reduces rapidly, at the same well head stop pressurization gas injection；
Due to reduced pressure in tubing string, bottom pressure is closed, now exists more than pressure in 6 top tubing string of constant pressure valve, constant pressure valve 6
Pressure differential is formed between in the tubing string of shaft bottom and 6 top of constant pressure valve, when the pressure differential is fast more than 4 lower section of inflatable packer
When in prompt drop pressure device 5, pressure control film 8 sets pressure-bearing value, pressure control film 8 ruptures, and downhole gas 12 are from reduction of blood pressure in high-speed
The tube wall through hole of device 5 is quickly flowed in tubing string, then quickly escapes into oil jacket ring from the tube wall through hole of reduction of blood pressure in high-speed device 3
Empty 10, realize shaft bottom and the reduction of blood pressure in high-speed in borehole 11.Due to 12 decompressional expansion of gas, while gas 12 is in rock
In 13 internal ratio borehole 11 of hole, flowing is slow, and in blowhole 13, Amplitude of Hypotensive is little, and in blowhole 13, pressure P1 is remote
More than pressure P2 in borehole 11, in blowhole 13 near borehole wall 14 and between borehole 11 is interior, High Pressure Difference is formed,
The High Pressure Difference produces impetus power by borehole surface rock cement loose, and will toward the flowing in pit shaft by stratum
Loose rock residue discharges borehole, effectively expands borehole aperture.
The better embodiment of the present invention is the foregoing is only, protection scope of the present invention with above-mentioned embodiment is not
Limit, as long as those of ordinary skill in the art should all include claim according to disclosed equivalent modifications or change
Described in protection domain in.
Claims (5)
1. a kind of method that expansion expands borehole aperture in included gas, it is characterised in that using with pressurization and
Reduction of blood pressure in high-speed function tubing string string, is pressurizeed to shaft bottom by well head and persistently injects resiliency compressible gas, realize shaft bottom and borehole
Nearby in blowhole, pressurization and shaft bottom reduction of blood pressure in high-speed, gas decompressional expansion, and gas are flowed in blowhole internal ratio borehole
Dynamic slow, in blowhole, gas Amplitude of Hypotensive is little, forms gas high pressure in blowhole near borehole wall between borehole
Difference, gas high pressure difference produce impetus power by borehole surface rock cement loose, and with stratum toward the stream in pit shaft
Move and loose rock is discharged borehole.
2. a kind of method that expansion expands borehole aperture in included gas as claimed in claim 1, its feature exist
In, described pressurization and reduction of blood pressure in high-speed function tubing string string mainly by oil pipe, choke valve, reduction of blood pressure in high-speed device, inflatable packer,
Reduction of blood pressure in high-speed device, constant pressure valve are sequentially connected composition.
3. a kind of method that expansion expands borehole aperture in included gas as claimed in claim 2, its feature exist
Be the pipe nipple for having through hole on tube wall in, the reduction of blood pressure in high-speed device, the pipe nipple is provided with pressure control film, the through hole by
Pressure control diaphragm seal, the pressurized rear to a certain extent moment rupture of the pressure control film, the pressurized big I of the film set.
4. a kind of method that expansion expands borehole aperture in included gas as claimed in claim 1, its feature exist
In, the shaft bottom and the borehole nearby blowhole pressurization be by gas injection of pressurizeing into tubing string string, by level pressure valve action
Make in tubing string string, to form pressure reduction, the expansion of inflatable packer packing element is setting, insulates shaft bottom and oil jacket annular space, persistent pressure gas injection
Realize pressure rise in blowhole near shaft bottom and borehole.
5. a kind of method that expansion expands borehole aperture in included gas as claimed in claim 1, its feature exist
In the shaft bottom reduction of blood pressure in high-speed is successively broken by pressure control film in two reduction of blood pressure in high-speed devices of inflatable packer upper and lower
Split, the through hole of upper and lower two reduction of blood pressure in high-speed devices, connected well bottom and oil jacket annular space is opened, gas is quickly overflowed from shaft bottom
Shaft bottom reduction of blood pressure in high-speed is realized to oil jacket annular space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510531844.3A CN106481322B (en) | 2015-08-27 | 2015-08-27 | A kind of method that interior expansion of included gas expands borehole aperture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510531844.3A CN106481322B (en) | 2015-08-27 | 2015-08-27 | A kind of method that interior expansion of included gas expands borehole aperture |
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| Publication Number | Publication Date |
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| CN106481322A true CN106481322A (en) | 2017-03-08 |
| CN106481322B CN106481322B (en) | 2018-08-24 |
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| CN201510531844.3A Expired - Fee Related CN106481322B (en) | 2015-08-27 | 2015-08-27 | A kind of method that interior expansion of included gas expands borehole aperture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672388A (en) * | 2018-07-03 | 2020-01-10 | 中国石油化工股份有限公司 | Device and method for injecting molten alloy into rock pore |
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| US6173783B1 (en) * | 1999-05-17 | 2001-01-16 | John Abbott-Brown | Method of completing and producing hydrocarbons in a well |
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| CN102182439A (en) * | 2011-04-26 | 2011-09-14 | 中国石油化工集团公司 | Balanced-pressure perforation/negative-pressure backflow process |
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2015
- 2015-08-27 CN CN201510531844.3A patent/CN106481322B/en not_active Expired - Fee Related
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| US6173783B1 (en) * | 1999-05-17 | 2001-01-16 | John Abbott-Brown | Method of completing and producing hydrocarbons in a well |
| CN1283736A (en) * | 2000-09-05 | 2001-02-14 | 大港油田集团测井公司 | Negative-pressure equipment of multi-stage perforator for oil tube delivery |
| CN101016828A (en) * | 2007-02-02 | 2007-08-15 | 中国石油大学(华东) | Foam negative pressure mixed discharging plug removal method |
| CN102213083A (en) * | 2011-04-19 | 2011-10-12 | 中国石油化工集团公司 | Negative pressure perforation and ultra-negative pressure pump suction integrated production process |
| CN102182439A (en) * | 2011-04-26 | 2011-09-14 | 中国石油化工集团公司 | Balanced-pressure perforation/negative-pressure backflow process |
| CN202081873U (en) * | 2011-05-27 | 2011-12-21 | 大庆华翰邦石油装备制造有限公司 | Universal type dynamic negative pressure perforator |
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| 刘桥: "PURE动态负压射孔技术在大庆油田的应用", 《硅谷》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672388A (en) * | 2018-07-03 | 2020-01-10 | 中国石油化工股份有限公司 | Device and method for injecting molten alloy into rock pore |
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| CN106481322B (en) | 2018-08-24 |
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