CN201037414Y - Thick oil thermal production well dynamic liquid level measuring switch device - Google Patents
Thick oil thermal production well dynamic liquid level measuring switch device Download PDFInfo
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- CN201037414Y CN201037414Y CNU2007200901395U CN200720090139U CN201037414Y CN 201037414 Y CN201037414 Y CN 201037414Y CN U2007200901395 U CNU2007200901395 U CN U2007200901395U CN 200720090139 U CN200720090139 U CN 200720090139U CN 201037414 Y CN201037414 Y CN 201037414Y
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Abstract
The utility model relates to a switching device for testing working fluid level of heavy oil thermal recovery well, the main body of the switching device is of a tubular structure, the lower end of the tubular structure is connected with a heat insulation packer through a tubing short section, the upper end of the tubular structure is connected with a lower end of the pump body of a heavy oil pump through a tubing buckle, one side of the tubular structure is provided with a liquid feed valve [3-2], a liquid outlet end of the liquid feed valve is communicated with an oil casing annulus, a liquid feed end of the liquid feed valve is communicated with a tubing inner annular gap, a start-close mechanism of the liquid feed valve matches with a start-close mechanism of a reciprocating pull rod [3-1-2], the upper end of the reciprocating pull rod is connected with the lower end of a heavy oil pump piston [2-1]. The utility model matched with a heavy oil reservoir insulation injection-production technology string can solve the problem that the technology string can not test a fluid level without moving the string insulation injection. When a steam injection is finished and a production is processed, the piston is placed, and a valve ball of the liquid feed valve falls back downwards along with the piston, the inner annulus and outer annulus of the oil casing are communicated, and oil flows into the annulus of the oil casing, so the testing of working fluid level can be processed while producing.
Description
Technical field
The utility model relates to a kind of heavy crude heat extraction down-hole instrument, and particularly the producing fluid level switching device is surveyed in the down-hole.
Technical background
At present dark at China's oil reservoir, oil well output is high, core intersection is bigger, notes long viscous crude field of vapour cycle is all taked major diameter (φ 177.8mm) cased hole completion and conventional exploitation via steam injection mode usually, in this mining type owing to use two to overlap independently tubing string fully---steam injection string and conventional pumping pipe string realize annotating vapour respectively and the two kinds of functions of recovering the oil, therefore with conventional recover the oil to produce equally in oil recovery, can carry out the measurement of producing fluid level; But for oil reservoir is thin, non-homogeneity is serious, reservoir buried depth is shallow, annotate the short heat extraction by steam injection heavy oil wells of vapour period ratio, for effective exploitation, reduce investment outlay, increase economic efficiency, the mining type that needs employing φ 139.7mm cased hole completion and the heat insulation notes of fixed tubular column to adopt has used heat insulation injection-production technology tubing string in this mining type, owing to annotate vapour and the shared casing string that recovers the oil, this tubing string is supporting heat insulation packer, thereby can't survey producing fluid level or well-flushing.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of thick oil thermal extraction down-hole to survey the producing fluid level switching device, surveys producing fluid level or well-flushing when can realize that with the supporting use of the heat insulation injection-production technology tubing string of heavy crude reservoir the heat insulation notes of fixed tubular column are adopted.
The technical solution adopted in the utility model is: a kind of heavy crude heat extraction well surveying producing fluid level switching device, the main body of this switching device is a tubular structure, the tubular structure lower end is connected with heat insulation packer by tubing nipple, the tubular structure upper end is connected with suction pump pump housing lower end by tubing thread, one side of tubular structure is provided with the feed liquor valve, the outlet end of feed liquor valve is communicated with the oil jacket annular space, the liquid feeding end of feed liquor valve is communicated with annular space in the oil pipe, the mechanism for opening/closing of feed liquor valve opens and closes with a reciprocal pull bar transmission and cooperates, and back and forth the upper end of pull bar is connected suction pump plunger lower end.
Described feed liquor valve is positioned at the opening eccentric ladder blind hole up of tubular structure main body one side, be located the mechanism for opening/closing of forming by spring base, spring, valve ball in the blind hole from bottom to top successively, be provided with the valve ball seat in the blind hole upper port, spring base slides up and down and is assemblied in the blind hole, and spring base cooperates with reciprocal pull bar transmission.
The mechanism for opening/closing of described feed liquor valve cooperates with reciprocal pull bar transmission by a spring detent of assembling in the tubular structure main body, the middle part of spring detent is a tubular structure, the external surface of this tubular structure is slidedly assemblied in the tubular structure body inner surface of switching device, spring detent expands by its upper end claw and is attached to corresponding position inner surface in the tubular structure main body, the pull bar box cupling push-and-pull that spring detent is provided with by its lower end claw and reciprocal pull bar lower end is grabbed to bump and is cooperated, when the pull bar box cupling interts action up and down, the driving spring pawl is done two up and down spacing reciprocating motions, the body of spring detent is in transmission connection by a control screw and spring base, the keying of control feed liquor valve.
The control screw links together spring detent, spring base by pack into spring detent, spring base mating holes of valve body joint pilot hole, plug by screw thread rotation in the pilot hole of valve body joint and weldering dead.
The tubular structure main body of this switching device is formed by connecting by tubing thread by the valve body joint of grabbing button short circuit and hypomere of epimere, grabs the button short circuit by connecing suction pump pump housing lower end on the tubing thread, and the valve body joint links to each other with heat insulation packer upper end by tubing nipple downwards.
There is boss the outside of the upper end claw of spring detent, there is boss the inside of lower end claw, upper end claw, lower end claw all are made up of 3～12 pawls, be provided with fuel feed hole around the tube wall of spring detent, the top dead-centre that the wall of grabbing button short circuit inside is provided with corresponding two up and down spacing cooperations with the exterior boss of upper end claw grabs the buckle structure groove and bottom dead centre is grabbed the buckle structure groove.
The feed liquor valve is positioned at the eccentric ladder blind hole of valve body joint, and the spring detent in the valve body joint is an eccentric through-hole by the hole, the control screw shifting chute on the valve body joint by a center circle post hole and eccentric ladder blind hole, the eccentric through-hole of valve body joint intersect simultaneously into.
Valve ball seat in the feed liquor valve blind hole upper port is pressed on ladder inner surface place, the eccentric ladder blind hole of valve body joint upper end by an interior square hole nut; the upper port of interior square hole nut is by the protection piece that has been threaded, and the interior square hole nut sidewall of protection piece below is provided with the side direction inlet opening.
The top dead-centre of grabbing button short circuit inside is grabbed buckle structure groove and bottom dead centre, and to grab the spacing of buckle structure groove be 10mm～100mm; It is 10mm～100mm that fuel feed hole on the spring detent and its are gone up the spacing of controlling screwing through hole; Feed liquor valve place in the valve body joint eccentric ladder blind hole eccentric throw is 10mm～100mm, and length is 20mm～200mm; The eccentric through-hole eccentric throw of valve body joint is 5mm～50mm; The diameter in the center circle post hole of valve body joint [3-3-2] is 50mm～150mm, and length is 20mm～200mm.
Back and forth the upper end of pull bar is connected suction pump plunger lower end by oil-feed cover under the pump.
Design and work thereof by feed liquor valve, spring detent and reciprocal pull bar cooperate, the utility model has solved the heat insulation injection-production technology tubing string of existing heavy crude reservoir surveys the problem of producing fluid level or well-flushing when can not realize that the heat insulation notes of fixed tubular column are adopted, the perfect production practice of heavy crude reservoir.
Description of drawings
Fig. 1 is a heavy crude heat extraction well surveying producing fluid level switching device down well placement schematic diagram;
Fig. 2 is a heavy crude heat extraction well surveying producing fluid level switching device structural representation of the present utility model;
Fig. 3 is for grabbing button short circuit 3-3-1 structural representation;
Fig. 4 is a spring detent 3-3-3 structural representation;
Fig. 5 is a valve body joint 3-3-2 structural representation;
Fig. 6 for the B of Fig. 5 to looking diagrammatic sketch;
Fig. 7 is the C-C sectional view of Fig. 5.
The specific embodiment
The utility model will be further described below in conjunction with accompanying drawing.
See Fig. 1,2, during lower tubular column, will be connected on suction pump 2 pump housing lower ends by feed liquor valve 3-2 and this apparatus main body structure division, and connect heat insulation packer 5 for 4 times by tubing nipple; The pull bar box cupling 3-1-3 that oil-feed cover 3-1-1 is connected with the pull bar lower end under the pump that pull bar 3-1-2, pull bar upper end connect then separates with agent structure, is connected the lower end of suction pump plunger 2-1 separately.
See Fig. 2,3,4,5,6,7, the main body of this heavy crude heat extraction well surveying producing fluid level switching device is a tubular structure, the tubular structure lower end is connected with heat insulation packer by tubing nipple, the tubular structure upper end is connected with suction pump pump housing lower end by tubing thread, one side of tubular structure is provided with feed liquor valve 3-2, the outlet end of feed liquor valve is communicated with the oil jacket annular space, the liquid feeding end of feed liquor valve is communicated with annular space in the oil pipe, the mechanism for opening/closing of feed liquor valve opens and closes with a reciprocal pull bar 3-1-2 transmission and cooperates, and back and forth the upper end of pull bar is connected suction pump plunger 2-1 lower end.Feed liquor valve 3-2 is positioned at the opening eccentric ladder blind hole 3-3-2-1 up of tubular structure main body one side, be located the mechanism for opening/closing of forming by spring base 3-2-1, spring 3-2-2, valve ball 3-2-3 in the blind hole 3-3-2-1 from bottom to top successively, be provided with valve ball seat 3-2-4 in the blind hole 3-3-2-1 upper port, spring base 3-2-1 slides up and down and is assemblied in the blind hole 3-3-2-1, and spring base 3-2-1 cooperates with reciprocal pull bar 3-1-2 transmission.The mechanism for opening/closing of feed liquor valve 3-2 cooperates with reciprocal pull bar 3-1-2 transmission by a spring detent 3-3-3 of assembling in the tubular structure main body, the middle part of spring detent 3-3-3 is a tubular structure, the external surface of this tubular structure is slidedly assemblied in the tubular structure body inner surface of switching device, spring detent 3-3-3 expands by its upper end claw 3-3-3-1 and is attached to corresponding position inner surface in the tubular structure main body, spring detent 3-3-3 grabs to bump with the pull bar box cupling push-and-pull that reciprocal pull bar 3-1-2 lower end is provided with by its lower end claw 3-3-3-2 and cooperates, when the pull bar box cupling interts action up and down, driving spring pawl 3-3-3 does two up and down spacing reciprocating motions, the body of spring detent 3-3-3 is in transmission connection by a control screw 3-3-4 and spring base 3-2-1, the keying of control feed liquor valve 3-2.Control screw 3-3-4 links together spring detent 3-3-3, spring base 3-2-1 by pack into spring detent 3-3-3, spring base 3-2-1 mating holes of valve body joint 3-3-2 pilot hole 3-3-2-4, plug 3-3-5 by screw thread rotation in the pilot hole 3-3-2-4 of valve body joint 3-3-2 and weldering dead.When specifically manufacturing, the tubular structure main body of this switching device is formed by connecting by tubing thread by the valve body joint 3-3-2 that grabs button short circuit 3-3-1 and hypomere of epimere, grab button short circuit 3-3-1 by connecing suction pump 2 pump housing lower ends on the tubing thread, valve body joint 3-3-2 links to each other with heat insulation packer 5 upper ends by tubing nipple 4 downwards.There is boss the outside of the upper end claw 3-3-3-1 of spring detent 3-3-3, there is boss the inside of lower end claw 3-3-3-2, upper end claw 3-3-3-1, lower end claw 3-3-3-2 are made up of 3～12 pawls, be provided with fuel feed hole 3-3-3-3 around the tube wall of spring detent 3-3-3, the top dead-centre that the wall of grabbing button short circuit 3-3-1 inside is provided with corresponding two up and down spacing cooperations with the exterior boss of upper end claw 3-3-3-1 grabs buckle structure groove 3-3-1-1 and bottom dead centre is grabbed buckle structure groove 3-3-1-2.Feed liquor valve 3-2 is positioned at the eccentric ladder blind hole 3-3-2-1 of valve body joint 3-3-2, spring detent 3-3-3 among the valve body joint 3-3-2 is eccentric through-hole 3-3-2-2 by the hole, the control screw 3-3-4 shifting chute 3-3-2-3 on the valve body joint 3-3-2 by a center circle post hole 3-3-2-5 and eccentric ladder blind hole 3-3-2-1, the eccentric through-hole 3-3-2-2 of valve body joint 3-3-2 intersect simultaneously into.Valve ball seat 3-2-4 in the feed liquor valve blind hole 3-3-2-1 upper port is pressed on ladder inner surface place, the eccentric ladder blind hole of valve body joint 3-3-2 3-3-2-1 upper end by an interior square hole nut 3-2-5; the upper port of interior square hole nut 3-2-5 is by the protection piece 3-2-6 that has been threaded, and interior square hole nut [3-2-5] sidewall of protection piece 3-2-6 below is provided with the side direction inlet opening.The top dead-centre of grabbing button short circuit 3-3-1 inside is grabbed buckle structure groove 3-3-1-1 and bottom dead centre, and to grab the spacing of buckle structure groove 3-3-1-2 be 10mm～100mm; It is 10mm～100mm that fuel feed hole 3-3-3-3 on the spring detent 3-3-3 and its are gone up the spacing of controlling screw 3-3-4 through hole 3-3-3-4; Feed liquor valve [3-2] place among the valve body joint 3-3-2 eccentric ladder blind hole 3-3-2-1 eccentric throw is 10mm～100mm, and length is 20mm～200mm; The eccentric through-hole 3-3-2-2 eccentric throw of valve body joint 3-3-2 is 5mm～50mm; The diameter of the center circle post hole 3-3-2-5 of valve body joint [3-3-2] is 50mm～150mm, and length is 20mm～200mm.Back and forth the upper end of pull bar is connected suction pump plunger 2-1 lower end by oil-feed cover 3-1-1 under the pump.
Before annotating the vapour operation, plunger 2-1 and reciprocal pull bar are proposed, on carry and push away spring detent 3-3-3 lower end claw 3-3-3-2 on the process pull bar box cupling 3-1-3, spring detent 3-3-3 is up, its upper end claw 3-3-3-1 grabs buckle structure groove 3-3-1-2 and upwards slips into top dead-centre and grab buckle structure groove 3-3-1-1 from grabbing the inner bottom dead centre of button short circuit 3-3-1, simultaneously, spring detent 3-3-3 drives spring base 3-2-1 by control screw 3-3-4, spring 3-2-2 and valve ball 3-2-3 move upward and compress valve ball seat 3-2-4, annular space inside and outside the oil pipe is separated, continue to strengthen upper lifting force, pull bar box cupling 3-1-3 passes spring detent 3-3-3 lower end claw 3-3-3-2 and is suggested with plunger 2-1, can annotate the vapour operation then.
Annotating vapour finishes when producing, transfer plunger 2-1, push away spring detent 3-3-3 lower end claw 3-3-3-2 under the pull bar box cupling 3-1-3, spring detent 3-3-3 is descending, its upper end claw 3-3-3-1 grabs the descending bottom dead centre of grabbing button short circuit 3-3-1 that slips into of buckle structure groove 3-3-1-1 and grabs buckle structure groove 3-3-1-2 from grabbing the inner top dead-centre of button short circuit 3-3-1, simultaneously, feed liquor valve 3-2 valve ball 3-2-3, the descending thereupon falling of spring 3-2-2, the inside and outside annular space of oil pipe is communicated with, oil flows to into the oil jacket annular space, continues to strengthen thrust down, makes pull bar box cupling 3-1-3 and pull bar 3-1-2 pass spring detent 3-3-3 lower end claw 3-3-3-2, just can produce, carry out the measurement of producing fluid level simultaneously.
Protection piece 3-2-6 can avoid foreign matter to fall into the inlet opening of interior square hole nut 3-2-5, prevents that the cooperation between valve ball 3-2-3 and valve ball seat 3-2-4 was lost efficacy.Plug 3-3-5 also welds in the pilot hole 3-3-2-4 of valve body joint 3-3-2 by screw thread rotation and extremely guarantees to isolate inside and outside the oil pipe.
Can realize cooperating the injection-production technology tubing string when the heat insulation notes of fixed tubular column are adopted, to carry out the measurement of producing fluid level by said process; In addition, cooperate the needs that also can satisfy technology for washing well with other downhole tools.
Claims (10)
1. heavy crude heat extraction well surveying producing fluid level switching device, it is characterized in that: the main body of this switching device is a tubular structure, the tubular structure lower end is connected with heat insulation packer by tubing nipple, the tubular structure upper end is connected with suction pump pump housing lower end by tubing thread, one side of tubular structure is provided with feed liquor valve [3-2], the outlet end of feed liquor valve is communicated with the oil jacket annular space, the liquid feeding end of feed liquor valve is communicated with annular space in the oil pipe, the mechanism for opening/closing of feed liquor valve opens and closes with reciprocal pull bar [3-1-2] transmission and cooperates, and back and forth the upper end of pull bar is connected suction pump plunger [2-1] lower end.
2. heavy crude heat extraction well surveying producing fluid level switching device according to claim 1, it is characterized in that: described feed liquor valve [3-2] is positioned at the opening eccentric ladder blind hole [3-3-2-1] up of tubular structure main body one side, be located successively from bottom to top in the blind hole [3-3-2-1] by spring base [3-2-1], spring [3-2-2], the mechanism for opening/closing that valve ball [3-2-3] is formed, be provided with valve ball seat [3-2-4] in blind hole [3-3-2-1] upper port, spring base [3-2-1] slides up and down and is assemblied in the blind hole [3-3-2-1], and spring base [3-2-1] cooperates with reciprocal pull bar [3-1-2] transmission.
3. heavy crude heat extraction well surveying producing fluid level switching device according to claim 2, it is characterized in that: the mechanism for opening/closing of described feed liquor valve [3-2] cooperates with reciprocal pull bar [3-1-2] transmission by a spring detent [3-3-3] of assembling in the tubular structure main body, the middle part of spring detent [3-3-3] is a tubular structure, the external surface of this tubular structure is slidedly assemblied in the tubular structure body inner surface of switching device, spring detent [3-3-3] expands by its upper end claw [3-3-3-1] and is attached to corresponding position inner surface in the tubular structure main body, the pull bar box cupling push-and-pull that spring detent [3-3-3] is provided with by its lower end claw [3-3-3-2] and reciprocal pull bar [3-1-2] lower end is grabbed to bump and is cooperated, when the pull bar box cupling interts action up and down, driving spring pawl [3-3-3] is done two up and down spacing reciprocating motions, the body of spring detent [3-3-3] is in transmission connection with spring base [3-2-1] by a control screw [3-3-4], the keying of control feed liquor valve [3-2].
4. heavy crude heat extraction well surveying producing fluid level switching device according to claim 3, it is characterized in that: control screw [3-3-4] links together spring detent [3-3-3], spring base [3-2-1] by pack into spring detent [3-3-3], spring base [3-2-1] mating holes of valve body joint [3-3-2] pilot hole [3-3-2-4], plug [3-3-5] by screw thread rotation the pilot hole [3-3-2-4] of valve body joint [3-3-2] in and weld extremely.
5. according to arbitrary described heavy crude heat extraction well surveying producing fluid level switching device of claim 1-4, it is characterized in that: the tubular structure main body of this switching device is formed by connecting by tubing thread by the valve body joint [3-3-2] of grabbing button short circuit [3-3-1] and hypomere of epimere, grab button short circuit [3-3-1] by connecing suction pump [2] pump housing lower end on the tubing thread, valve body joint [3-3-2] links to each other with heat insulation packer [5] upper end by tubing nipple [4] downwards.
6. heavy crude heat extraction well surveying producing fluid level switching device according to claim 5, it is characterized in that: there is boss the outside of the upper end claw [3-3-3-1] of spring detent [3-3-3], there is boss the inside of lower end claw [3-3-3-2], upper end claw [3-3-3-1], lower end claw [3-3-3-2] all is made up of 3～12 pawls, be provided with fuel feed hole [3-3-3-3] around the tube wall of spring detent [3-3-3], grab top dead-centre that the inner wall of button short circuit [3-3-1] is provided with corresponding two up and down spacing cooperations with the exterior boss of upper end claw [3-3-3-1] and grab buckle structure groove [3-3-1-1] and grab buckle structure groove [3-3-1-2] with bottom dead centre.
7. heavy crude heat extraction well surveying producing fluid level switching device according to claim 6, it is characterized in that: feed liquor valve [3-2] is positioned at the eccentric ladder blind hole [3-3-2-1] of valve body joint [3-3-2], spring detent [3-3-3] in the valve body joint [3-3-2] is eccentric through-hole [3-3-2-2] by the hole, control screw [3-3-4] shifting chute [3-3-2-3] on the valve body joint [3-3-2] by a center circle post hole [3-3-2-5] and eccentric ladder blind hole [3-3-2-1], the eccentric through-hole [3-3-2-2] of valve body joint [3-3-2] intersect simultaneously into.
8. according to claim 6 or 7 described heavy crude heat extraction well surveying producing fluid level switching devices; it is characterized in that: the valve ball seat [3-2-4] in feed liquor valve blind hole [3-3-2-1] upper port is pressed on ladder inner surface place, the eccentric ladder blind hole of valve body joint [3-3-2] [3-3-2-1] upper end by an interior square hole nut [3-2-5]; the upper port of interior square hole nut [3-2-5] is by the protection piece [3-2-6] that has been threaded, and interior square hole nut [3-2-5] sidewall of protection piece [3-2-6] below is provided with the side direction inlet opening.
9. heavy crude heat extraction well surveying producing fluid level switching device according to claim 8 is characterized in that: grabbing the inner top dead-centre of button short circuit [3-3-1], to grab the spacing that buckle structure groove [3-3-1-1] and bottom dead centre grab buckle structure groove [3-3-1-2] be 10mm～100mm; Fuel feed hole [3-3-3-3] on the spring detent [3-3-3] and on it control screw [3-3-4] through hole [3-3-3-4] spacing be 10mm～100mm; Eccentric ladder blind hole [3-3-2-1] eccentric throw in feed liquor valve [3-2] place in the valve body joint [3-3-2] is 10mm～100mm, and length is 20mm～200mm; Eccentric through-hole [3-3-2-2] eccentric throw of valve body joint [3-3-2] is 5mm～50mm; The diameter in the center circle post hole [3-3-2-5] of valve body joint [3-3-2] is 50mm～150mm, and length is 20mm～200mm.
10. heavy crude heat extraction well surveying producing fluid level switching device according to claim 9 is characterized in that: back and forth the upper end of pull bar is connected suction pump plunger [2-1] lower end by oil-feed cover [3-1-1] under the pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200901395U CN201037414Y (en) | 2007-04-23 | 2007-04-23 | Thick oil thermal production well dynamic liquid level measuring switch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200901395U CN201037414Y (en) | 2007-04-23 | 2007-04-23 | Thick oil thermal production well dynamic liquid level measuring switch device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201037414Y true CN201037414Y (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200901395U Expired - Fee Related CN201037414Y (en) | 2007-04-23 | 2007-04-23 | Thick oil thermal production well dynamic liquid level measuring switch device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201037414Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775045A (en) * | 2013-09-13 | 2014-05-07 | 中国石油天然气股份有限公司 | Thickened oil thermal production well immovable string separate injection and commingled production method and device |
| CN104213888A (en) * | 2014-07-28 | 2014-12-17 | 中国石油化工股份有限公司 | Down-hole steam injection string of thick-oil thermal production well |
-
2007
- 2007-04-23 CN CNU2007200901395U patent/CN201037414Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775045A (en) * | 2013-09-13 | 2014-05-07 | 中国石油天然气股份有限公司 | Thickened oil thermal production well immovable string separate injection and commingled production method and device |
| CN104213888A (en) * | 2014-07-28 | 2014-12-17 | 中国石油化工股份有限公司 | Down-hole steam injection string of thick-oil thermal production well |
| CN104213888B (en) * | 2014-07-28 | 2016-09-21 | 中国石油化工股份有限公司 | A kind of thick oil thermal extraction down-hole steam injection string |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20150423 |
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| EXPY | Termination of patent right or utility model |