CN204386576U - Horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column - Google Patents
Horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column Download PDFInfo
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- CN204386576U CN204386576U CN201420839532.XU CN201420839532U CN204386576U CN 204386576 U CN204386576 U CN 204386576U CN 201420839532 U CN201420839532 U CN 201420839532U CN 204386576 U CN204386576 U CN 204386576U
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Abstract
The utility model discloses a kind of horizontal well in segments Intermittent cyclic steam stimulation note and adopt integrated pipe column, it comprises and stays well casing post and be arranged at this and stay steam injection section in well casing post and oil recovery section, this steam injection section comprises at least one for injecting the distributor of vapours, connected by oil pipe between this distributor, this oil recovery section comprises at least one production mandrel for oil pipe open flow and at least two seal bar, at least one this production mandrel is connected between adjacent two seal bar, connected by oil pipe between this production mandrel, in the middle of this oil recovery section one end and gas injection section by seal bar every isolation, the seal bar of this oil recovery section other end is connected with an instlated tubular, this instlated tubular is communicated to well head, this stays in well casing post and is provided with multiple sealing drum, each sealing drum and corresponding described seal bar interference fit.Horizontal well is divided into independently steam injection section and oil recovery section by the utility model, and different layers is intersegmental completely isolated, segmentation steam injection accurately, there is not the situation that steam alters layer, improves steam injection efficiency.
Description
Technical field
The utility model, about a kind of petroleum works field PetroChina Company Limited. mining equipment, refers to that a kind of horizontal well in segments Intermittent cyclic steam stimulation for oil exploitation well viscous crude steam injection thermal recovery note adopts integrated pipe column especially.
Background technology
At present in oil exploitation, for loose sand special thick oil and super-heavy oil deposit, the even steam injection string adopted is that subordinate enters distributor in screen casing, realizes the multiple spot steam injection of horizontal segment.Because sieve tube segment does not have seal section, being all be communicated with between screen casing and the borehole wall, because the difference of in-place permeability, can there is local vapour and alters, be difficult to realize real segmentation steam injection in steam.
Loose sand heavy crude reservoir present stage work flow first descends sand control pipe, then descends steam injection string, and carry out steam injection, stewing well, open flow, finally withdraw from steam injection string, lower pump is gone into operation.This exploitation pattern exposes the problems such as with short production cycle, cycle oil production is low gradually.
By souring when many rounds steam soak and open flow, easily there is the problems such as screen casing bad break, distortion, cause the application life of steam injection horizontal well very short in the horizontal well sieve tube of current steam injection.
Utility model content
In view of this, main purpose of the present utility model is to provide a kind of horizontal well in segments Intermittent cyclic steam stimulation of steam soak note that utilizes to adopt integrated pipe column.
For achieving the above object, the utility model provides a kind of horizontal well in segments Intermittent cyclic steam stimulation to note and adopts integrated pipe column, it comprises and stays well casing post and be arranged at this and stay steam injection section in well casing post and oil recovery section, this steam injection section comprises at least one for injecting the distributor of vapours, connected by oil pipe between this distributor, this oil recovery section comprises at least one production mandrel for oil pipe open flow and at least two seal bar, at least one this production mandrel is connected between adjacent two seal bar, connected by oil pipe between this production mandrel, in the middle of this oil recovery section one end and gas injection section by seal bar every isolation, the seal bar of this oil recovery section other end is connected with an instlated tubular, this instlated tubular is communicated to well head, this stays in well casing post and is provided with multiple sealing drum, each sealing drum and corresponding described seal bar interference fit.
Described seal bar comprises the box cupling, top lifting sub, top variable buckle joint, multiple sealing shroud, bottom variable buckle joint and the bottom pipe nipple that are threaded connection successively.
End to end by screw thread between each described sealing shroud, connect step place at adjacent two sealing shrouds and be provided with elevated-temperature seal ring.
The stainless steel ring that described elevated-temperature seal ring comprises both sides and the high temperature resistant FFKM be embedded between stainless steel ring.
Described production mandrel comprises: the first variable buckle joint, shunting plug, the first bilateral body and reversed check valve, this the first bilateral body comprises inwall and outer wall, this the first variable buckle joint is tubular construction, its one end is threaded connection outer wall one end of this first bilateral body, this shunting plug is cylindrical tube structure, it is inner that it is located at this first variable buckle joint, this shunting plug one end is connected with the inwall threaded one end of this first bilateral body, and this reversed check valve is located in the cavity formed by this shunting plug and this first bilateral body inwall.
Described reversed check valve comprises the first spring, the first kick back, the first steel ball, wherein this first kick back is located between this first spring and first steel ball, this the first spring other end is resisted against the openend of described shunting plug, this first steel ball is resisted against the inner wall port place of described first bilateral body, and is sealed by this inner wall port.
Be divided into two passages in described first bilateral body, be respectively the inner chamber body of these inwall central authorities and be located at multiple double wall passages of both sides between this inwall and outer wall, these double wall passage two ends are double wall hole, this outer wall have the open flow hole running through this inner chamber body.
Described distributor comprises: the second variable buckle joint, ball seat, the second bilateral body and copper current only valve; This second bilateral body comprises inwall and outer wall, and this second variable buckle joint is cylindrical tube structure, and the outer wall of its one end and this second bilateral body is threaded connection; Described ball seat is cylindrical shell, and it is located in this second variable buckle joint, and the inwall of its one end and described second bilateral body is threaded connection, and this copper current only valve is located in the cavity formed by the inwall of described ball seat and described second bilateral body.
Described copper current only valve comprises the second steel ball, the second kick back, the second spring, wherein this second kick back is located between this second spring and second steel ball, this second spring one end is resisted against on the step in the inwall of described first bilateral body, this the second steel ball is resisted against the openend of this ball seat, and is sealed the openend of this ball seat.
Be divided into two passages in described second bilateral body, be respectively the inner chamber body of the central authorities of described inwall and be located at multiple double wall passages of both sides between inwall and outer wall, these double wall passage two ends are double wall hole, this outer wall have the injecting hole running through this inner chamber body.
Horizontal well is divided into independently steam injection section and oil recovery section by the utility model, and different layers is intersegmental completely isolated, segmentation steam injection accurately, there is not the situation that steam alters layer, improves steam injection efficiency.
Accompanying drawing explanation
Fig. 1 is the seal bar cross-sectional view in the utility model;
Fig. 2 is the production mandrel structural representation in the utility model;
Fig. 3 is the distributor structural representation in the utility model;
Fig. 4 is that the utility model horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column structure and application schematic diagram thereof;
Fig. 5 is the schematic perspective view of the first bilateral body of production mandrel in the utility model;
Fig. 6 is the schematic perspective view of the second bilateral body of distributor in the utility model.
Detailed description of the invention
For ease of having further understanding to structure of the present utility model and the effect that reaches, the existing preferred embodiment that develops simultaneously by reference to the accompanying drawings is described in detail as follows.
As shown in Figure 4, horizontal well in segments Intermittent cyclic steam stimulation note of the present utility model adopts integrated pipe column, comprise and stay well casing post A to stay steam injection section in well casing post A and oil recovery section with being arranged at, this steam injection section comprises at least one for injecting the distributor 3 of vapours, connected by oil pipe between each distributor 3, this oil recovery section comprises at least one production mandrel 2 for oil pipe open flow and at least two seal bar 1, at least one production mandrel 2 is connected between adjacent two seal bar 1, connected by oil pipe between each production mandrel 2, isolated by seal bar 1 between this oil recovery section one end and steam injection section, the seal bar 1 of this oil recovery section other end (i.e. the superiors of integrated pipe column) connects an instlated tubular 4, this instlated tubular 4 is communicated to well head, this stays in well casing post A and is provided with multiple sealing drum 5, each sealing drum 5 and corresponding seal bar 1 interference fit.In embodiment of the present utility model, seal bar 1 is provided with three, and the production mandrel 2 between adjacent two seal bar 1 is provided with two or three, and distributor 3 is provided with three.
As shown in Figure 1, seal bar 1 of the present utility model, it comprises the box cupling 11, top lifting sub 12, top variable buckle joint 13, multiple sealing shroud 14, bottom variable buckle joint 16 and the bottom pipe nipple 17 that connect successively, connected by screw thread head and the tail between each sealing shroud 14, sealing shroud screw thread section is provided with 75
0conical surface seal, to carry out more effective sealing between each sealing shroud 14, wherein box cupling 11 and top lifting sub 12, top variable buckle joint 13 is connected by screw thread successively, top variable buckle joint 13 other end is threaded with the sealing shroud 14 of wherein one end, sealing shroud 14 and the bottom variable buckle joint 16 of the other end, bottom pipe nipple 17 is threaded connection successively, totally nine sealing shrouds 14 in the present embodiment, connect step place at adjacent two sealing shrouds 14 and be also provided with elevated-temperature seal ring 15, wherein elevated-temperature seal ring 15 stainless steel ring that comprises both sides and the high temperature resistant FFKM that is embedded between stainless steel ring, high temperature resistant FFKM in elevated-temperature seal ring 15 and sealing drum 5 interference fit stayed in well casing post A, seal at high operating temperatures, realize segmentation in pipe.
As shown in Figure 2, production mandrel 2 of the present utility model, it comprises: the first variable buckle joint 21, shunting plug 22, first bilateral body 27 and reversed check valve, this the first variable buckle joint 21 is tubular construction, its one end is plain end oil well pipe internal thread, the other end is common internal thread, and the other end and the first bilateral body 27 major diameter outer wall external screw thread of the first variable buckle joint 21 are threaded connection.This shunting plug 22 is cylindrical tube structure, it is inner that it is located at this first variable buckle joint 21, this shunting plug 22 one end is provided with spring pedestal, and the other end is provided with internal thread, if female one end by screwed connection on the external screw thread of the first bilateral body 27 left end minor diameter inwall.Reversed check valve is located in the cavity that shunting plug 22 and the first bilateral body 27 inwall formed, this reversed check valve comprises the first spring 23, first kick back 24, first steel ball 25, wherein this first kick back 24 is located between the first spring 23 and the first steel ball 25, this the first spring 23 other end is resisted against on the spring pedestal of shunting plug 22, this first steel ball 25 is resisted against this first bilateral body 27 inner wall port place, and is sealed by inner wall port.This first kick back 24 is cylindrical structure, and centre is provided with aperture, and aperture surrounding is provided with macropore and is communicated with up and down.
The connection of thread of the first variable buckle joint 21 and the first bilateral body 27 also can be provided with O-ring seals 26, to make the junction of the first variable buckle joint 21 and the first bilateral body 27 more seal.
Composition graphs 2 is with shown in Fig. 5, and the first bilateral body 27 of the present utility model is cylindrical tube, and the outer wall of left end and inwall are provided with two common external screw threads, and right-hand member is provided with plain end oil well pipe internal thread, two passages are divided in first bilateral body 27, be respectively the inner chamber body 270 of inwall central authorities and be located at multiple double wall passages 271 of both sides between inwall and outer wall, these double wall passage 271 two ends are double wall hole 272, this outer wall has the open flow hole 273 running through inner chamber body 270, inner chamber body 270 is connected with the first bilateral body 27 outside, also by double wall hole about 272 UNICOM at two ends, after the external screw thread of the first bilateral body 27 left end minor diameter inwall and shunting plug 22 screwed connection, the steam injection pressure of oil pipe cannot push the steel part outside that reversed check valve enters into the first variable buckle joint 21 and the first bilateral body 27 open, steam injection section lower floor can only be transferred the pressure to by the double wall hole 272 of the first bilateral body 27, but the pressure of external cavity can push the inner chamber that ball-and-seat enters into the first variable buckle joint 21 and shunting plug 22 open through open flow hole 273.
As shown in Figure 3, distributor 3 of the present utility model, it comprises: the second variable buckle joint 31, ball seat 32, second bilateral body 37 and copper current only valve; Wherein: this second variable buckle joint 31 is cylindrical tube structure, and its one end is plain end oil well pipe internal thread, and the other end is common internal thread, the internal thread of the other end of this second variable buckle joint 31 and the external screw thread screwed connection of the second bilateral body 37 outer wall.Described ball seat 32 is cylindrical shell, and it is located in the second variable buckle joint 31, and its one end is common external screw thread, with the common internal thread screwed connection of the second bilateral body 37 inwall.This copper current only valve is located in the cavity that ball seat 32 and the second bilateral body 37 inwall formed, this copper current only valve comprises the second steel ball 33, second kick back 34, second spring 35, wherein this second kick back 34 is located between the second spring 33 and the second steel ball 35, this second spring one end is resisted against on the step in the first bilateral body 37 inwall, this the second steel ball 33 is resisted against the openend of this ball seat 32, and the openend of ball seat 32 is sealed, the opening pressure of copper current only valve is adjusted by the size of the compression distance and ball seat 32 aperture that adjust the second spring 35.
The connection of thread of the second variable buckle joint 31 and the second bilateral body 37 also can be provided with O-ring seals 36, to make the junction of the second variable buckle joint 31 and the second bilateral body 37 more seal.
Composition graphs 3 is with shown in Fig. 6, and described second bilateral body 37 is cylindrical tube, and left end outer wall is provided with a common external screw thread, and inwall is provided with a common internal thread, and right-hand member is provided with plain end oil well pipe internal thread, two passages are divided in second bilateral body 37, be respectively the inner chamber body 370 of inwall central authorities and be located at multiple double wall passages 371 of both sides between inwall and outer wall, these double wall passage 371 two ends are double wall hole 372, this outer wall has the injecting hole 373 running through inner chamber body, namely inner chamber body 370 is connected with the second bilateral body 37 outside, also by double wall hole about 372, two ends UNICOM, after second bilateral body 37 left end internal thread and ball seat 32 screwed connection, the gas injection pressure of oil pipe pushes copper current only valve enters into the second variable buckle joint 31 and the second bilateral body 37 steel part outside through injecting hole 373 open, due to the effect of copper current only valve, steel part external pressure cannot be pushed ball-and-seat open and enter into oil pipe.
Copper current only valve in the utility model in distributor and the reversed check valve in production mandrel, the contact surface of the connection steel part contacted with steel ball is all 45 ° of inclined-planes, steel part and steel ball linear sealing.
Be threaded (i.e. screwed connection) except the elevated-temperature seal of plain end oil well pipe screw thread in the utility model, the sealing means of the screwed connection of regular screw threads is all 75 ° of conical surface steel parts sealings.
As shown in Figure 4, it is noted for horizontal well in segments Intermittent cyclic steam stimulation and adopts integrated pipe column underground work position view.Horizontal well in segments interval note is adopted integrated pipe column and is connected from the bottom to top and be followed successively by: plug B, distributor 3, seal bar 1, production mandrel 2, seal bar 1, production mandrel 2, seal bar 1, instlated tubular Thickened oil injection-production integrated pipe column 4 to well head.By the length of connected pipes between adjustment means, make each seal bar all with stay the sealing drum 5(sealing drum in well casing post A to refer to stay internal diameter in well casing post is less, the good cavity of surface roughness) realize fitted seal, production mandrel is in the middle part of every section of oil reservoir, in each oil recovery section, multiple production mandrel is configured, configurable multiple distributor in steam injection section according to oil reservoir length.
Tubing string transfer and put in place after well head steam injection Special wellhead is installed.Inject high-temperature steam in oil pipe, in steam injection process, high-temperature steam enters oil reservoir to epimere by the copper current only valve that first steam pressure pushes foot distributor 3 open makes viscosity of crude reduce.The reversed check valve pushing epimere production mandrel 2 open by crude oil pressure during open flow after steam injection completes enters oil pipe, adopts integrated pump be lifted to ground through note.During open flow, the copper current only valve of foot distributor 3 cuts out, and when can effectively prevent bottom steam injection section screen casing from bearing open flow, liquid stream washes away.
After producing a period of time, reservoir temperature reduces, and repeats above-mentioned steps steam injection again after viscosity of crude raises.
As needed the section of changing steam injection or the section of changing exploitation after too much round steam injection, then trip out horizontal well in segments Intermittent cyclic steam stimulation note and adopt integrated pipe column, down to design attitude behind the position of adjustment distributor, production mandrel.Repeat above-mentioned note and adopt step continuation production.
Compared with prior art, the utility model has following beneficial effect: by managing interior, pipe outer two-layer sealing, horizontal segment is divided into independently steam injection section and oil recovery section, and different layers is intersegmental completely isolated; , there is not the situation that steam alters layer, improve steam injection efficiency in segmentation steam injection accurately; Horizontal well is divided into steam injection section, oil recovery section, and during steam injection, distributor is opened by steam pressure, and vapours enters oil reservoir to oil recovery section oil reservoir from steam injection section, flows into pit shaft after viscosity of crude reduces from oil recovery section; According to geological condition, the interchangeable tubing string section of changing steam injection, realizes thickened oil recovery from other layer of steam injection, if screen damage, also can enter down seal bar shutoff and damage oil reservoir, realize thickened oil recovery from other layer of steam injection; The layering of steam injection string has been come by the high temperature FFKM of seal bar and the interference fit of sealing drum, do not have slips packing element mechanism, thus after there will not be steam injection to complete removing seal for packer difficulty etc. situation; During open flow, because forward and reverse ball-and-seat effect production mandrel is opened, distributor is closed, and when can effectively prevent bottom steam injection section screen casing from bearing open flow, liquid stream washes away, protection screen casing.
The above, be only preferred embodiment of the present utility model, is not intended to limit protection domain of the present utility model.
Claims (10)
1. a horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column, it is characterized in that, it comprises and stays well casing post and be arranged at this and stay steam injection section in well casing post and oil recovery section, this steam injection section comprises at least one for injecting the distributor of vapours, connected by oil pipe between this distributor, this oil recovery section comprises at least one production mandrel for oil pipe open flow and at least two seal bar, at least one this production mandrel is connected between adjacent two seal bar, connected by oil pipe between this production mandrel, in the middle of this oil recovery section one end and gas injection section by seal bar every isolation, the seal bar of this oil recovery section other end is connected with an instlated tubular, this instlated tubular is communicated to well head, this stays in well casing post and is provided with multiple sealing drum, each sealing drum and corresponding described seal bar interference fit.
2. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 1 adopts integrated pipe column, it is characterized in that, described seal bar comprises the box cupling, top lifting sub, top variable buckle joint, multiple sealing shroud, bottom variable buckle joint and the bottom pipe nipple that are threaded connection successively.
3. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 2 adopts integrated pipe column, it is characterized in that, end to end by screw thread between each described sealing shroud, connects step place be provided with elevated-temperature seal ring at adjacent two sealing shrouds.
4. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 3 adopts integrated pipe column, it is characterized in that, the stainless steel ring that described elevated-temperature seal ring comprises both sides and the high temperature resistant FFKM be embedded between stainless steel ring.
5. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 1 adopts integrated pipe column, it is characterized in that, described production mandrel comprises: the first variable buckle joint, shunting plug, first bilateral body and reversed check valve, this the first bilateral body comprises inwall and outer wall, this the first variable buckle joint is tubular construction, its one end is threaded connection outer wall one end of this first bilateral body, this shunting plug is cylindrical tube structure, it is inner that it is located at this first variable buckle joint, this shunting plug one end is connected with the inwall threaded one end of this first bilateral body, this reversed check valve is located in the cavity formed by this shunting plug and this first bilateral body inwall.
6. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 5 adopts integrated pipe column, it is characterized in that, described reversed check valve comprises the first spring, the first kick back, the first steel ball, wherein this first kick back is located between this first spring and first steel ball, this the first spring other end is resisted against the openend of described shunting plug, this first steel ball is resisted against the inner wall port place of described first bilateral body, and is sealed by this inner wall port.
7. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 5 adopts integrated pipe column, it is characterized in that, two passages are divided in described first bilateral body, be respectively the inner chamber body of these inwall central authorities and be located at multiple double wall passages of both sides between this inwall and outer wall, these double wall passage two ends are double wall hole, this outer wall have the open flow hole running through this inner chamber body.
8. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 1 adopts integrated pipe column, and it is characterized in that, described distributor comprises: the second variable buckle joint, ball seat, the second bilateral body and copper current only valve; This second bilateral body comprises inwall and outer wall, and this second variable buckle joint is cylindrical tube structure, and the outer wall of its one end and this second bilateral body is threaded connection; Described ball seat is cylindrical shell, and it is located in this second variable buckle joint, and the inwall of its one end and described second bilateral body is threaded connection, and this copper current only valve is located in the cavity formed by the inwall of described ball seat and described second bilateral body.
9. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 8 adopts integrated pipe column, it is characterized in that, described copper current only valve comprises the second steel ball, the second kick back, the second spring, wherein this second kick back is located between this second spring and second steel ball, this second spring one end is resisted against on the step in the inwall of described first bilateral body, this the second steel ball is resisted against the openend of this ball seat, and is sealed the openend of this ball seat.
10. horizontal well in segments Intermittent cyclic steam stimulation note as claimed in claim 8 adopts integrated pipe column, it is characterized in that, two passages are divided in described second bilateral body, be respectively the inner chamber body of the central authorities of described inwall and be located at multiple double wall passages of both sides between inwall and outer wall, these double wall passage two ends are double wall hole, this outer wall have the injecting hole running through this inner chamber body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839532.XU CN204386576U (en) | 2014-12-26 | 2014-12-26 | Horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839532.XU CN204386576U (en) | 2014-12-26 | 2014-12-26 | Horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column |
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| Publication Number | Publication Date |
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| CN204386576U true CN204386576U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420839532.XU Withdrawn - After Issue CN204386576U (en) | 2014-12-26 | 2014-12-26 | Horizontal well in segments Intermittent cyclic steam stimulation note adopts integrated pipe column |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481484A (en) * | 2014-12-26 | 2015-04-01 | 东营市福利德石油科技开发有限责任公司 | Horizontal well segmented intermittent steam huff and puff injection-production integrated pipe column |
| WO2017131850A1 (en) * | 2015-12-01 | 2017-08-03 | Conocophillips Company | Single well cross steam and gravity drainage (sw-xsagd) |
| US10853762B2 (en) | 2015-09-23 | 2020-12-01 | Conocophillips Company | Global monitoring system for critical equipment performance evaluation |
| US11428086B2 (en) | 2015-04-27 | 2022-08-30 | Conocophillips Company | SW-SAGD with between heel and toe injection |
-
2014
- 2014-12-26 CN CN201420839532.XU patent/CN204386576U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481484A (en) * | 2014-12-26 | 2015-04-01 | 东营市福利德石油科技开发有限责任公司 | Horizontal well segmented intermittent steam huff and puff injection-production integrated pipe column |
| US11428086B2 (en) | 2015-04-27 | 2022-08-30 | Conocophillips Company | SW-SAGD with between heel and toe injection |
| US10853762B2 (en) | 2015-09-23 | 2020-12-01 | Conocophillips Company | Global monitoring system for critical equipment performance evaluation |
| US11978013B2 (en) | 2015-09-23 | 2024-05-07 | Conocophillips Company | Global monitoring system for critical equipment performance evaluation |
| WO2017131850A1 (en) * | 2015-12-01 | 2017-08-03 | Conocophillips Company | Single well cross steam and gravity drainage (sw-xsagd) |
| US10995596B2 (en) | 2015-12-01 | 2021-05-04 | Conocophillips Company | Single well cross steam and gravity drainage (SW-XSAGD) |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150610 Effective date of abandoning: 20170620 |