CN2635906Y - Pressure control valve for downhole leakage detection - Google Patents
Pressure control valve for downhole leakage detection Download PDFInfo
- Publication number
- CN2635906Y CN2635906Y CN 03213945 CN03213945U CN2635906Y CN 2635906 Y CN2635906 Y CN 2635906Y CN 03213945 CN03213945 CN 03213945 CN 03213945 U CN03213945 U CN 03213945U CN 2635906 Y CN2635906 Y CN 2635906Y
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- CN
- China
- Prior art keywords
- pressure
- plug
- control valve
- downhole
- leakage detection
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- Expired - Fee Related
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- Examining Or Testing Airtightness (AREA)
- Safety Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The utility model relates to a downhole leakage detecting and testing pressure control valve used for maintenance of casing in downhole operations in oilfields, wherein a single-side convex is arranged outside a body, eyelets are lathed on both sides of the convex part, an embedment plug and a release plug which respectively consists of a spring and a ball are installed in corresponding eyelets, and by screwing-in or screwing-out of screws, adjustment of working pressure is realized; thereby, the problems in the prior art such as unstable working performance, inaccurate pressure adjustment and easy to malfunction due to repeat opening and closing are solved. The utility model can be broadly applied to downhole casing maintenance in oilfields, and is especially applicable to maintenance of downhole casing in recovery of heavy oil.
Description
Technical field:
The utility model relates to effective " the down-hole leakage detection pressure-control valve " of a kind of oilfield downhole operation maintenance cover.
Background technology:
Present domestic old filed is many, down-hole casing uses through long-term in oilfield exploitation, well damage, especially thickened oil recovery, the gas injecting minings that adopt more, it is very serious that this technology causes down-hole casing to damage, general sleeve in oil field spoilage is up to about 15%, adopt the benefit Manifold technology mostly to be hydraulic expanding tube formula casing patching technology, it is at corrosion leakage, thread failure, the mistake perforation, the technology of squeezing type casing failure well such as fatigue damage in the gas injection process and developing in the implementation process of this technology, determines that the casing leakage position is one of key link, in the work of determining leak source, realize with the form that adds choke valve in the middle of two packers, and the choke valve that generally uses in the oil field at present has the service behaviour instability, and adjustable operating pressure is inaccurate, shortcoming such as inefficacy easily in the work.
The utility model content:
In order to overcome pressure-control valve service behaviour instability in the prior art, pressure is regulated inaccurate, repeatedly repeat the deficiency that open and close were easily lost efficacy, the utility model provides a kind of " down-hole leakage detection pressure-control valve ", and this valve has stable work in work, and operating pressure is adjustable, the precision height, the characteristics that back pressure is stable repeatedly repeat the open and close dependable performance, can not imitate the accuracy that improves down-hole leakage detection construction in work progress.
The technical scheme that its technical problem that solves the utility model adopts is: " down-hole leakage detection pressure-control valve " is in the construction of down-hole leakage detection, direct with packer respectively or problem links to each other at its upper/lower terminal, can connect 1 or 2 or multiple-tubing string between two packers according to actual conditions.When tubing string behind the precalculated position, in the oil pipe chamber, suppress, packer is subjected to compression swelling when pressure reaches 2-3Mpa, oil sets annular space in the sealing between lower packet, form the pressure testing cavity of a sealing, when pressure reached 4-5Mpa, the admission passage of down-hole leakage detection pressure-control valve was opened, the oil pipe inner chamber communicates with the pressure testing cavity, continue to suppress, after pressure reaches certain value, observe pressure changing, whether can determine this section casing leakage, after having inspected, release pressure, because pressure testing this moment chamber pressure is higher than the oil pipe internal pressure from well head, release channel is opened (minimum pressure that discharges plug is 0.5Mpa), and annular pressure discharges.The plug that enters of down-hole pressure control valve is all regulated by spring with the opening pressure that discharges plug, adjustment screw is positioned at the spring top, can change the position of adjustment screw by the turn adjustment screw with respect to spring, can to pressure-control valve enter pressure and release pressure is regulated, to reach desirable operating pressure value, the packer deblocking, the handling tubing string is finished this well section leakage detection operation.
The utility model beneficial effect is the stable work in work of this control valve, good reliability, precision height; Entering plug and discharging the operating pressure of filling in of this valve is adjustable; Pressure-control valve enters pressure and release pressure is stable; This valve body can be repeatedly used; The protecting packer packing element prevents that the highly pressurised liquid in the cavity from stinging bad packing element.
Description of drawings:
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model overall structure schematic diagram.
Among the figure 1, main body, 2, adjustment screw, 3, enter plug, 4, discharge plug.
The specific embodiment:
In Fig. 1, be provided with columnar one-sided projection in the outside of body 1, and at the two ends of bossing car perforation, the columnar plug 3 that enters is installed in the corresponding eyelet with columnar release plug 4, entering plug 3 is made up of spring and spheroid two parts respectively with release plug 4, spring and spheroid are respectively charged in the eyelet at protruding two ends, then respectively cylindrical adjustment screw 2 is installed in the end position of eyelet again, can regulate the operating pressure that enters plug 3 and release plug 4 by precession and back-out adjustment screw 2, can be adjusted to the operating pressure value of design; When this pressure-control valve work, with down-hole string such as packer down to waiting to check the well section, in oil pipe, inject working solution, pressurize gradually after filling with, under pressure, the packer at two ends is subjected to inner-pressure expansion up and down, forms the pressure testing cavity at the tubing and casing annular space, and pressure continues to raise, enter the spheroid pressurized in the plug 3, move on the compression spring, admission passage is opened, and the oil pipe inner chamber communicates with the pressure testing cavity, after reaching pressure balance, the pressure of spraining is implemented in the leakage detection work on this section sleeve pipe, behind end-of-job, by the pressure release of oil pipe inner chamber, the pressure testing chamber pressure discharges the spheroid pressurized in the plug 4 during greater than the oil pipe chamber pressure, promotes spring and moves down, release channel is opened, highly pressurised liquid in the pressure testing cavity enters in the oil pipe chamber by release channel, and the packer deblocking is realized pressure release.Move up and down tubing string, finish other locational leakage detection construction.
Claims (1)
1, a kind of down-hole leakage detection pressure-control valve, it is characterized in that: be provided with columnar one-sided projection in the outside of body (1), and at the two ends of bossing car perforation, the columnar plug (3) that enters is installed in the corresponding eyelet with columnar release plug (4), entering plug (3) is made up of spring and spheroid two parts respectively with release plug (4), spring and spheroid are respectively charged in the eyelet at protruding two ends, then respectively cylindrical adjustment screw (2) are installed in the end position of eyelet again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03213945 CN2635906Y (en) | 2003-07-03 | 2003-07-03 | Pressure control valve for downhole leakage detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03213945 CN2635906Y (en) | 2003-07-03 | 2003-07-03 | Pressure control valve for downhole leakage detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2635906Y true CN2635906Y (en) | 2004-08-25 |
Family
ID=34289766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03213945 Expired - Fee Related CN2635906Y (en) | 2003-07-03 | 2003-07-03 | Pressure control valve for downhole leakage detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2635906Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454370A (en) * | 2010-10-28 | 2012-05-16 | 大港油田集团有限责任公司 | Constant-pressure protection device of screw drilling tool |
| CN104100228A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Synchronous separate mining reversing valve |
-
2003
- 2003-07-03 CN CN 03213945 patent/CN2635906Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454370A (en) * | 2010-10-28 | 2012-05-16 | 大港油田集团有限责任公司 | Constant-pressure protection device of screw drilling tool |
| CN104100228A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Synchronous separate mining reversing valve |
| CN104100228B (en) * | 2013-04-03 | 2016-10-19 | 中国石油天然气股份有限公司 | Synchronous separate mining reversing valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |