CN202560158U - Drillable combined bridge plug - Google Patents
Drillable combined bridge plug Download PDFInfo
- Publication number
- CN202560158U CN202560158U CN2012202275240U CN201220227524U CN202560158U CN 202560158 U CN202560158 U CN 202560158U CN 2012202275240 U CN2012202275240 U CN 2012202275240U CN 201220227524 U CN201220227524 U CN 201220227524U CN 202560158 U CN202560158 U CN 202560158U
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- centerbody
- bridging plug
- ring
- slips
- packing element
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- Expired - Fee Related
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Abstract
The utility model relates to a drillable combined bridge plug which is connected to the bottom of a setting tool. The bridge plug comprises a columnar central body made of a non-metal composite material, wherein an upper limiting body, a check ring, an upper clamping tile, an upper cone, a rubber barrel, a lower cone, a lower clamping tile and a lower limiting body are sequentially sleeved on the outer wall of the central body; the upper limiting body and the lower limiting body are fixedly connected with the central body respectively; a solid part which is pressed against the setting tool and a hollow part positioned below the solid part are formed in the central body; and a columnar cavity of the central body is formed by the hollow part. Due to a design of the columnar cavity in the central body, the solid part drilled by a drill bit is greatly reduced in a process of drilling the bridge plug subjected to layered fracturing, so that the construction efficiency is further improved; and moreover, the number of drilled fragments is relatively small, and the fragments are more easily discharged out of a well.
Description
Technical field
The utility model is meant a kind of compound bridging plug of boring of horizontal well separate stratum fracfturing that is applied to especially relevant for oil well underground work field.
Background technology
Along with the exploitation of petroleum resources in recent years, the shared proportion of unconventional petroleum resources is increasing.The exploitation unconventional petroleum resources must adopt the fracturing reform technology, promptly in oil recovery process, utilizes the water conservancy effect, makes oil reservoir form the crack, thereby improves the oil reservoir penetrating power, to increase oil production.And the unconventional oil well thin for the petroleum resources reservoir, that permeability is low, the operating personnel often adopts horizontal well separate stratum fracfturing technology, promptly is with treating that the fractured well section is divided into a plurality of little intervals, and successively pressure break increases substantially the correctional effect of fractured well with this.
In the separate stratum fracfturing technology; Need use capping tools each interval is carried out shutoff; And after the separate stratum fracfturing operation completion, also need capping tools to drill through, thereby each fractured layer is connected to every layer; Fluid can successfully compile in sleeve pipe, and flow string also can be lowered to smoothly and carry out oil extraction operation.The most frequently used capping tools is exactly a bridging plug at present, and the effect of bridging plug is exactly an oil gas well seal, has characteristics such as working procedure is few, the cycle short, card envelope position is accurate.
Originally, the bridging plug that once generally used metal material to process in the industry, this bridging plug is hard because of its material, and drilling through in the process after separate stratum fracfturing bored and milled difficulty, length consuming time, prolonged duty cycle, reduces operating efficiency; And bit freezing, anti-row's difficulty are brought difficulty to construction easily; Significantly reduced the application life of drill bit or milling head.Thereby can not satisfy the post-fracturing rapid construction needs of multistage.
For this reason, the dealer has designed the drillable bridging plug that adopts composite material to process, the for example compound bridging plug of drillable of Chinese patent notification number CN202181876 U.This bridging plug comprises a centerbody, and order is arranged with and sets pressure ring, upper slips, upper cone, packing element, lower cone, lower slips and lower isolating ring on centerbody, and the packing element two ends are arranged with one group of multilayer umbrella respectively; Its centerbody, set pressure ring and lower isolating ring is processed by glass fiber reinforced epoxy resin, upper and lower slips is processed by cast iron, and upper/lower cone is processed by phenolic resin material.With the bridging plug of the combination of materials Design and Machining of this uniqueness, bore easily and mill, the chip that grinds off is gently little, is easier to go out, and also can prevent bit freezing, has overcome the defective of metal bridging plug, more is applicable to the horizontal well separate stratum fracfturing.
Yet when adopting the bridging plug that this type of composite material processes; Drilling through in the process after separate stratum fracfturing though composite material can make the drilling amount of feeding strengthen, thereby makes the drilling speed-raising; But drill bit still need be from the bridging plug top drilling always to the bridging plug bottom; Promptly need the entity part of drilling still longer, its efficiency of construction still has much room for improvement, so still can not satisfy the post-fracturing rapid construction needs of multistage fully.
In addition; When adopting this type of bridging plug to set with packing element structure; Still the compound bridging plug of drillable with Chinese patent notification number CN 202181876U is an example, uses hydraulic way or pyrophoric ignition mode to suppress setting tool, moves down thereby promote to set pressure ring; Set that pressure ring promotes upper slips again, upper cone moves down; The position-limiting action that lower slips, lower cone receive lower isolating ring pushes packing element from two ends, and make packing element pressurized spreading and be adjacent to the sleeve pipe borehole wall, thus the annular space between the sealing bridging plug and the sleeve pipe borehole wall.But packing element is an elastic body because of its rubber material, and after suppressing external force and disappearing, the packing element of pressurized spreading discharges elastic force and recovering state before the deformation probably, causes setting effect to have a greatly reduced quality, and the serious bridging plug that also possibly cause comes off, and sets inefficacy.
So, can design a kind of compound bridging plug that bores, it can used on the basis of composite material, can also make drilling through in the process after the separate stratum fracfturing, and the entity part of drill bit institute drilling is less, thereby further improves efficiency of construction; In addition, can also guarantee packing element after suppressing external force and disappearing, still can keep spreading and the recovering state before deformation not, so just can reduce the difficulty of suppressing operation, and guarantee to set respond well, then become the problem that need solve in the industry.
The utility model content
The purpose of the utility model promptly provides a kind of compound bridging plug of boring of hollow-core construction that has, and this bridging plug can make drilling through in the process after the separate stratum fracfturing, and the entity part of drill bit institute drilling significantly reduces, thereby further improves efficiency of construction.
The purpose of above-mentioned the utility model is to be realized by following technical scheme:
The utility model provides a kind of compound bridging plug that bores; Be connected in the bottom of setting tool; This bridging plug comprises the centerbody of the column of being processed by nonmetallic composite; Order is arranged with upper limit body, baffle ring, upper slips, upper cone, packing element, lower cone, lower slips and lower limit body on the outer wall of this centerbody, wherein upper limit body and lower limit body respectively with this centerbody Joint, described centerbody inside is formed with one in order to the solid part of top to setting tool; And being positioned at the hollow part below this solid part, this hollow part forms a column cavity of this centerbody.
Aforesaidly bore compound bridging plug, the length of the solid part of this centerbody is less than the length of this hollow part.
Aforesaidly bore compound bridging plug, also be equipped with between described baffle ring and the upper slips one limit this upper slips can only be to the stopping mechanism of bottom offset, the two ends up and down of this stopping mechanism are pushed up the lower end that is against baffle ring and the upper end of upper slips respectively.
Aforesaidly bore compound bridging plug, described stopping mechanism comprises: be positioned at the unidirectional tooth portion on this centerbody outside wall surface; And be located on the centerbody outside wall surface and be resisted against the lock ring of this baffle ring lower end, the internal face of this lock ring is provided with sawtooth, and is meshed with this unidirectional tooth portion and forms a stopping tooth; And one ring establish and be coated on the outside guard shield of this lock ring, the two ends up and down of this guard shield respectively with this baffle ring and upper slips push up mutually to, and leave the gap between the inwall of this guard shield and the lock ring, this lock ring can be via in this unidirectional tooth portion, moving downwards the top to this guard shield.
Aforesaidly bore compound bridging plug, described packing element is arranged in proper order and is formed by last packing element, middle packing element, lower rubber cylinder three parts, and this three part is processed by elastomeric material.
Aforesaidly bore compound bridging plug, between upper cone and last packing element, also be arranged with the ring that goes up on the outer wall of said centerbody, between lower cone and lower rubber cylinder, also be arranged with the ring that rises, this upper and lower material of encircling that rises is engineering plastics.
Aforesaidly bore compound bridging plug, on the outer wall of said centerbody in this inside of packing element also be equipped with a protection ring, this protection ring is a non-metallic material, and the hardness of the rubber that adopted greater than three above-mentioned part packing elements of its hardness.
Aforesaidly bore compound bridging plug, this upper limit body is the last overcoat of a hollow, and this lower limit body is the following overcoat of a hollow, and this upper and lower overcoat is fixed at the two ends up and down of this centerbody outer wall respectively.
Aforesaidly bore compound bridging plug, the end face near packing element of described upper and lower slips all is designed to inclined-plane 10 degree indents, and upper/lower cone also is designed to 10 degree cone angles and embeds respectively in this end face of upper and lower slips.
By above technical scheme, the advantage of the utility model is:
By the design that centerbody is processed the column cavity, make bridging plug the drilling through in the process after carrying out separate stratum fracfturing of the utility model, the entity part of drill bit institute drilling significantly reduces, thereby further improves efficiency of construction; The chip that bores is simultaneously also still less discharged outside the well more easily;
In addition, by the design of stopping mechanism, make the upper slips can only be to bottom offset, and can not be to top offset, the situation of deformation return takes place thereby the packing element that can prevent the pressurized spreading discharges elastic force, guarantees the good effect that sets with this.
Description of drawings
Fig. 1 implements to set the view of operation under horizontal well for the bridging plug of the utility model;
Fig. 2 is the half sectional view of the bridging plug of the utility model;
The critical element label declaration:
100 bridging plugs, 500 setting tools
600 oil pipes, 700 sleeve pipes
800 fractured layers
2 centerbodies, 21 solid part
The unidirectional tooth of 22 hollow parts 23 portion
312 times overcoats of overcoat on 311
32 baffle rings, 321 shear pins
33 stopping mechanisms, 331 lock rings
332 guard shields, 341 upper slipses
342 lower slipses, 351 upper cones
352 lower cones, 353,354 shear pins
361 go up encircles 362 times rings that rise
Packing element on 37 packing elements 371
Packing element 373 lower rubber cylinders in 372
374 protection rings
The specific embodiment
For goal of the invention, technological means and the technique effect that makes the utility model has more complete and clearly exposure,, and please consult accompanying drawing and element numbers in the lump now in detailed description down.Wherein, following " top " all refers to the left side of accompanying drawing, and " below " all refers to the right side of accompanying drawing.
At first specify the architectural feature that the utility model can bore compound bridging plug, see also shown in Figure 2.
The utility model bore compound bridging plug 100; The centerbody 2 that comprises the column of processing by nonmetallic composite; Order is arranged with upper limit body, baffle ring 32, stopping mechanism 33, upper slips 341, upper cone 351, the ring 361 that goes up, packing element 37, following ring 362, lower cone 352, lower slips 342 and the lower limit body of rising on the outer wall of this centerbody 2; Wherein the upper limit body is last overcoat 311; The lower limit body is following overcoat 312, and spiral shell is solid mutually with this centerbody 2 respectively for upper and lower overcoat 311,312, and the inside of this centerbody 2 is formed with one and supports setting tool 500 in order to the top and see Fig. 1) solid part 21; And being positioned at the hollow part 22 of these solid part 21 belows, this hollow part 22 forms a column cavity of these centerbodies 2.Preferably, the length of the solid part 21 in the centerbody 2 is less than the length of hollow part 22.By the design that centerbody 2 is processed the column cavity, make bridging plug 100 the drilling through in the process after carrying out separate stratum fracfturing of the utility model, the entity part of drill bit institute drilling significantly reduces, thereby further improves efficiency of construction; The chip that bores is simultaneously also still less discharged outside the well more easily.
In the preferred embodiment of the utility model, centerbody 2 upper ends of bridging plug 100 have internal thread, and can be screwed together in the bottom of setting tool 500; Last overcoat 311 end faces adopt inclined-plane empennage meshing mechanism design, spin when preventing to bore the mill bridging plug; Baffle ring 32 leans against overcoat 311 lower ends, and is fixed on the centerbody 2 with shear pin 321.
Above-mentioned stopping mechanism 33 sees also shown in Figure 2ly, and can limit this upper slips 341 can only be to bottom offset, and it pushes up respectively on the upper end of the lower end that is against baffle ring 32 and upper slips 341 at two ends up and down.Than the residence, this stopping mechanism 33 comprises the unidirectional tooth portion 23 that is positioned on these centerbody 2 outside wall surface; And be located on centerbody 2 outside wall surface and be resisted against the lock ring 331 of these baffle ring 32 lower ends, lock ring 331 internal faces are provided with sawtooth, and are meshed with this unidirectional tooth portion 23 and form the stopping tooth that is complementary; These lock ring 331 outsides are also encircled and are established and be coated with a guard shield 332; The two ends up and down of this guard shield 332 are pushed up mutually with upper slips 341 with this baffle ring 32 respectively and are supported; And leave the gap between the inwall of this guard shield 332 and the lock ring 331; This lock ring 331 can via in this unidirectional tooth portion move and downwards the top support this guard shield 332, through guard shield 332 downforce is passed to upper slips 341.By the design of stopping mechanism 33, make the upper slips 341 can only be, and can not be to top offset to bottom offset, the situation of deformation return takes place thereby the packing element 37 that can prevent the pressurized spreading discharges elastic forces, keeps the good effect that sets with this.
In the preferred embodiment of the utility model; Upper slips 341 lower surfaces are designed to inclined-plane 10 degree indents, and upper cone 351 also is designed to 10 degree cone angles and embeds in the lower surface of upper slips 341, slides with this distending that is more conducive to upper slips 341; Lower slips 342 designs in like manner, and hereinafter no longer launches.Upper and lower slips 341,342 all adopts cast iron materials.
In the preferred embodiment of the utility model, the end of upper cone 351, lower cone 352 is fixed on the centerbody 2 with shear pin 353,354 respectively; When setting, upper/lower cone 351,352 can be cut off shear pin 353,354 under the effect of downforce, makes cone applying sleeve pipe 700 inwalls (like Fig. 1).
In the preferred embodiment of the utility model, the ring 361,362 that rises up and down all adopts engineering plastics withstand voltage and that plasticity is strong, after being squeezed, can tighten up packing element 37, and with its applying sleeve pipe 700 inwalls.
In the preferred embodiment of the utility model, packing element 37 is arranged in proper order and is formed by last packing element 371, middle packing element 372, lower rubber cylinder 373 3 parts, can seal the oil jacket annular space, and this three part is processed by elastomeric material; Preferably; On the outer wall of centerbody 2 in this inside of packing element 372 also be equipped with a protection ring 374; This protection ring 374 is non-metallic material (a for example vulcanie); And the hardness of the rubber that its hardness is adopted greater than three above-mentioned part packing elements 37, packing element 372 is not tight with centerbody 2 applyings when setting in preventing with this.
Please consult Fig. 1 and shown in Figure 2 in the lump, by the utility model that above technical scheme constituted, its operating principle is following:
At first the bridging plug 100 of the utility model is connected the bottom of a setting tool 500, the top of setting tool 500 is connected the bottom of an oil pipe 600 again, this oil pipe 600 can be a coiled tubing; Then use oil pipe 600 float amount pumping bridging plug 100 and setting tools 500; When set of tools is lowered into horizontal well reservation position (between two fractured layers 800); The pitching from ground, treat that ball is fallen a ball seat of setting tool 500 after, oil pipe 600 is added hydraulic pressure; Pressure makes setting tool 500 cut off its overcoat shear pin and makes its overcoat push the baffle ring 32 of the utility model bridging plug downwards; The baffle ring 32 stressed shear pins 321 of cutting off are to bottom offset, and lock ring 331 receives thrust to bottom offset, and pushing tow guard shield 332 also drives upper slips 341 distendings and promotes upper cone 351 downwards; Simultaneously, because the following spacing top of overcoat 312 usefulness instead, upper/lower cone 351,352 is cut off shear pin 353,354 respectively under the squeezing action of upper and lower slips 341,342; This moment, upper/lower cone 351,352 was squeezed the effect meeting because of its opening compressive strain, continued extruding, upper and lower ring 361,362 and the packing element 37 meeting distendings of rising; The Sealed casing pipe annular space; The hard tooth of upper and lower slips 341,342 outside wall surface is stung tightly on sleeve pipe, and grappling bridging plug 100 is reached the effect that sets.
After pressure release; Upwards pull setting tool 500; Because bridging plug 100 grappling, the centerbody 2 of bridging plug 100 can be under the effect of pulling force breaks off at the weakness of ring wall, and a ring groove (as shown in Figure 2) for example can be set on the outside wall surface above the solid part 21 of centerbody 2; So realize setting tool 500 and after bridging plug 100 separated, the solid part 21 of this bridging plug 100 and part down thereof will be stayed down-hole generation layering sealing effectiveness.
Horizontal well separate zone stimulation technology for cased hole completion sees also Fig. 1, transforms successively to the superiors from basecoat fractured layer 800, at first is lowered to bridging plug with coiled tubing and sets; And orlop carried out perforation and pressure break, after the pressure break, take out coiled tubing and connect second bridging plug; Be lowered to again, carry out well the setting of the second layer, perforation and pressure break bottom, by that analogy; Can carry out the pressing crack construction of multi-section multi-layer, after whole intervals have been constructed, be lowered to brill miller tool and bore all bridging plugs.At this moment,, then in the process of boring the work of miller tool, can significantly raise the efficiency, thereby reach the goal of the invention of the utility model because each bridging plug all has short long hollow part of solid part and.
The above act is merely the schematic part embodiment of the utility model; It is not scope in order to restriction the utility model; Any those skilled in the art; Equivalent variations of under the prerequisite of design that does not break away from the utility model and principle, having done and modification all should be included within this patent protection domain.
Claims (9)
1. one kind can be bored compound bridging plug; Be connected in the bottom of setting tool; This bridging plug comprises the centerbody of the column of being processed by nonmetallic composite, and order is arranged with upper limit body, baffle ring, upper slips, upper cone, packing element, lower cone, lower slips and lower limit body on the outer wall of this centerbody, wherein upper limit body and lower limit body respectively with this centerbody Joint; It is characterized in that; Described centerbody inside is formed with one in order to the solid part of top to setting tool, and is positioned at the hollow part of this solid part below, and this hollow part forms a column cavity of this centerbody.
2. according to claim 1ly bore compound bridging plug, it is characterized in that the length of the solid part of this centerbody is less than the length of this hollow part.
3. according to claim 1 and 2ly bore compound bridging plug; It is characterized in that; Also be equipped with between described baffle ring and the upper slips one limit this upper slips can only be to the stopping mechanism of bottom offset, the two ends up and down of this stopping mechanism are pushed up the lower end that is against baffle ring and the upper end of upper slips respectively.
4. according to claim 3ly bore compound bridging plug, it is characterized in that described stopping mechanism comprises:
Be positioned at the unidirectional tooth portion on this centerbody outside wall surface; And
Be located on the centerbody outside wall surface and be resisted against the lock ring of this baffle ring lower end, the internal face of this lock ring is provided with sawtooth, and is meshed with this unidirectional tooth portion and forms a stopping tooth; And
The outside guard shield of this lock ring is established and be coated on to one ring, the two ends up and down of this guard shield respectively with this baffle ring and upper slips push up mutually to, and leave the gap between the inwall of this guard shield and the lock ring, this lock ring can be via in this unidirectional tooth portion, moving downwards the top to this guard shield.
5. according to claim 1 and 2ly bore compound bridging plug, it is characterized in that described packing element is arranged in proper order and formed by last packing element, middle packing element, lower rubber cylinder three parts, and this three part is processed by elastomeric material.
6. according to claim 5ly bore compound bridging plug; It is characterized in that; Between upper cone and last packing element, also be arranged with a rise ring on the outer wall of said centerbody, between lower cone and lower rubber cylinder, also be arranged with the ring that rises, this upper and lower material that rises by ring is engineering plastics.
7. according to claim 5ly bore compound bridging plug; It is characterized in that; On the outer wall of said centerbody in this inside of packing element also be equipped with a protection ring, this protection ring is a non-metallic material, and the hardness of the rubber that adopted greater than three above-mentioned part packing elements of its hardness.
8. according to claim 1 and 2ly bore compound bridging plug, it is characterized in that this upper limit body is the last overcoat of a hollow, this lower limit body is the following overcoat of a hollow, and this upper and lower overcoat is fixed at the two ends up and down of this centerbody outer wall respectively.
9. according to claim 1 and 2ly bore compound bridging plug; It is characterized in that; The end face near packing element of described upper and lower slips all is designed to inclined-plane 10 and spends indents, and upper/lower cone also is designed to 10 degree cone angles and embeds respectively in this end face of upper and lower slips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202275240U CN202560158U (en) | 2012-05-18 | 2012-05-18 | Drillable combined bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202275240U CN202560158U (en) | 2012-05-18 | 2012-05-18 | Drillable combined bridge plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202560158U true CN202560158U (en) | 2012-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202275240U Expired - Fee Related CN202560158U (en) | 2012-05-18 | 2012-05-18 | Drillable combined bridge plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202560158U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899258A (en) * | 2012-12-28 | 2014-07-02 | 安东石油技术（集团）有限公司 | Insert type casing slip |
| CN104612626A (en) * | 2015-02-11 | 2015-05-13 | 四机赛瓦石油钻采设备有限公司 | Bridge plug with large drift diameter |
| CN104775788A (en) * | 2014-01-10 | 2015-07-15 | 北京玻钢院复合材料有限公司 | High-temperature and high-pressure resistant quick drillable composite material bridge plug with combined sealing structure |
| CN105484700A (en) * | 2015-12-07 | 2016-04-13 | 中国石油天然气股份有限公司 | Large drift diameter rapid drilling bridge plug for fracturing |
| CN105545237A (en) * | 2016-02-02 | 2016-05-04 | 四机赛瓦石油钻采设备有限公司 | Anti-rotation anchoring structure beneficial to drilling |
| CN105545252A (en) * | 2016-02-02 | 2016-05-04 | 四机赛瓦石油钻采设备有限公司 | Anti-rotation fracture bridge plug beneficial to drilling |
| CN105756616A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Bridge plug assembly |
| CN108412456A (en) * | 2018-05-15 | 2018-08-17 | 西安瑞兰特石油设备有限公司 | Full composite material speed bores bridge plug |
| CN111021984A (en) * | 2018-10-09 | 2020-04-17 | 中国石油天然气股份有限公司 | Horizontal well shaft control device |
-
2012
- 2012-05-18 CN CN2012202275240U patent/CN202560158U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899258A (en) * | 2012-12-28 | 2014-07-02 | 安东石油技术（集团）有限公司 | Insert type casing slip |
| CN103899258B (en) * | 2012-12-28 | 2016-07-06 | 安东石油技术（集团）有限公司 | A kind of block insert type casing slip |
| CN104775788A (en) * | 2014-01-10 | 2015-07-15 | 北京玻钢院复合材料有限公司 | High-temperature and high-pressure resistant quick drillable composite material bridge plug with combined sealing structure |
| CN105756616A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Bridge plug assembly |
| CN104612626A (en) * | 2015-02-11 | 2015-05-13 | 四机赛瓦石油钻采设备有限公司 | Bridge plug with large drift diameter |
| CN105484700A (en) * | 2015-12-07 | 2016-04-13 | 中国石油天然气股份有限公司 | Large drift diameter rapid drilling bridge plug for fracturing |
| CN105545237A (en) * | 2016-02-02 | 2016-05-04 | 四机赛瓦石油钻采设备有限公司 | Anti-rotation anchoring structure beneficial to drilling |
| CN105545252A (en) * | 2016-02-02 | 2016-05-04 | 四机赛瓦石油钻采设备有限公司 | Anti-rotation fracture bridge plug beneficial to drilling |
| CN105545252B (en) * | 2016-02-02 | 2018-12-04 | 四机赛瓦石油钻采设备有限公司 | It is a kind of easily to bore anti-rotation press-fracturing bridge plug |
| CN108412456A (en) * | 2018-05-15 | 2018-08-17 | 西安瑞兰特石油设备有限公司 | Full composite material speed bores bridge plug |
| CN111021984A (en) * | 2018-10-09 | 2020-04-17 | 中国石油天然气股份有限公司 | Horizontal well shaft control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20210518 |