CN202000955U - Horizontal well high pressure resistant packer for reservoir transformation - Google Patents
Horizontal well high pressure resistant packer for reservoir transformation Download PDFInfo
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- CN202000955U CN202000955U CN2010206810635U CN201020681063U CN202000955U CN 202000955 U CN202000955 U CN 202000955U CN 2010206810635 U CN2010206810635 U CN 2010206810635U CN 201020681063 U CN201020681063 U CN 201020681063U CN 202000955 U CN202000955 U CN 202000955U
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- 230000009466 transformation Effects 0.000 title abstract 3
- 239000002184 metal Substances 0.000 claims abstract description 37
- 238000005987 sulfurization reaction Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000012856 packing Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 210000000664 rectum Anatomy 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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Abstract
A high-pressure-resistant packer of a horizontal well for reservoir transformation is applied to reservoir transformation for oil exploitation. 3-8 sections of self-expansion rubber cylinders are molded and vulcanized on the outer wall of the pipe body; an annular middle baffle ring is fixed between two adjacent sections of self-expansion rubber cylinders through fastening bolts, and the outer end parts of the self-expansion rubber cylinders at two ends are respectively fixed with a limiting ring through the fastening bolts; the self-expansion rubber cylinder consists of a self-expansion rubber cylinder body, a self-expansion rubber cylinder back pressure ring and a metal ring; two ends of the self-expansion rubber cylinder body are respectively provided with a self-expansion rubber cylinder back pressure ring; and a metal ring is vulcanized on the surface of the outer wall of the self-expansion rubber cylinder back pressure ring. The self-expansion rubber cylinder is effectively supported, so that the packer can reliably work in a high pressure difference environment, the length of the self-expansion rubber cylinder is reduced, and smooth running of a tool is facilitated; the drift diameter is larger, the yield of the oil and gas well after production is higher, and the well repair is more convenient; the reliability is high, has reduced the risk that appears in the operation process.
Description
Technical field
The utility model relates to a kind of oil exploitation downhole tool, and particularly a kind of downhole packer is the packer that a kind of reservoir reconstruction was met water, met oily self-expanding rubber tube with having of horizontal well.
Background technology
Along with fast development of national economy, the demand of primary energy such as petroleum gas is constantly increased.The unconventional oil-gas reservoir that Global Oil and Gas Resources exploitation focus turns to hyposmosis, difficulty to employ gradually comprises tight sand oil-gas reservoir, shale oil gas reservoir, coal bed gas etc.Be considered to not have the unconventional resource of exploiting economic worth in the past and obtained the large-scale commercial applications exploitation now, satisfied growing energy demand, obtained considerable economic, such as the shale gas exploitation of north America region.This mainly has benefited from development of technology, and especially the sizable application of horizontal well in segments stimulation technology greatly reduces development cost, has improved well yield, has prolonged stable production period.
At present, the high pressure resistant external packer of pipe in the horizontal well in segments stimulation technology kit is one of important instrument, and indexs such as its withstand voltage properties, reliability, working life, cost have a significant impact reservoir reconstruction effect and oil gas field recovery ratio.What the existing pressure break packer that is used for reservoir reconstruction adopted basically is mechanical packer.Chinese patent CN2111360 has introduced the self-styled pressure break packer of a kind of high pressure, this packer has adopted knockdown packer accessory, form a self-sealing high pressure sealing system by equilibrated valve, hydraulic anchor, hermetic unit, seal assembly locking device four parts, can be under the High Pressure Difference of 50～60MPa operate as normal.Chinese patent CN2038544 has introduced a kind of deep well high pressure packer, it is characterized in that adopting the structure of expanding packing element and the combination of compression packing element, under certain chock pressure difference, form pendular ring between two kinds of packing elements, utilize the relative Incoercibility principle of liquid, but realize the seat envelope.This packer can be used for multinomial technology construction such as deep well fracturing, acidifying, and can multistagely use.Chinese patent CN201460803U; a kind of chance water is provided, has met oily self-expanding packer; be made up of box cupling, central tube, spacing collar, protection ring, last caulking gum, lower seal rubber and caging bolt, the last caulking gum and the lower seal vulcanization of rubber are on the central tube outer wall.
Classify by seat envelope mode, existing reservoir reconstruction packer is divided into mechanical seat sealed type and hydraulic base sealed formula two classes.The former can only be used for straight well, can not be used for horizontal well, high angle hole.The latter's structure is very complicated, the risk of site operation existence seat envelope failure, and to hole diameter dimensional requirement height, hole diameter position bigger than normal can not be sealed by seat in the bore hole environment, and interior latus rectum is also little, is unfavorable for measure operation under the late well.In addition, the conventional tool cost is too high, and too much if the water horizontal well is transformed hop count, employed packer quantity is also a lot, and then the expense of instrument will increase greatly and cause exploitation without any benefit, can't regain the investment of unconventional production of hydrocarbons well.
The rubber that is used to make the self-expanding packer has a variety of (consulting U.S. patent documents US7059415 " Wellbore system with annular seal member ").Expandable rubber is a kind of elastic rubber material that will expand when placing in the particular fluid.Expandandable elastomeric mainly contains two types: expanding (swelling) in the oil and expand (permeability expansion) in water.Which kind of type no matter, along with the increase of volume, intensity will descend to some extent.
Summary of the invention
The purpose of this utility model is: provide a kind of reservoir reconstruction with the high pressure resistant packer of horizontal well, utilize and meet water, meet oily self-expanding material realization oil well downhole packing, for the horizontal well in segments stimulation technology provides reliable and effective kit.Overcome the conventional packer complex structure, the risk of site operation existence seat envelope failure, to hole diameter dimensional requirement height, hole diameter position bigger than normal can not be sealed by seat in the bore hole environment, and interior latus rectum is little, is unfavorable for the deficiency of measure operation under the late well.
The technical solution adopted in the utility model is: the reservoir reconstruction high pressure resistant packer of horizontal well, mainly form by body, self-expanding rubber tube, box cupling, spacing ring, fastening bolt and middle baffle ring, there is external screw thread at the two ends of body,, it is characterized in that by the box cupling that has been threaded at an end of body: mold pressing and sulfuration have 3～8 joint self-expanding rubber tubes on tube wall; Between adjacent two joint self-expanding rubber tubes, be fixed with a middle baffle ring of annular by fastening bolt; Outer end at two ends self-expanding rubber tube is fixed with a spacing ring respectively by fastening bolt.
The self-expanding rubber tube is made up of self-expanding rubber tube body, self-expanding rubber tube back pressure ring and metal ring; Self-expanding rubber tube back pressure ring is arranged respectively at the two ends of self-expanding rubber tube body, and vulcanizing in the outer wall surface of self-expanding rubber tube back pressure ring has metal ring.
The speed of expansion of meeting the speed of expansion of oily expanded rubber and hydro-expansive rubber is basic identical, is considerably slower than hydro-expansive rubber but meet the speed that the intensity in the oily expanded rubber expansion process descends.Utilize this characteristic, self-expanding rubber tube back pressure ring adopts meets the manufacturing of oily expanded rubber material, and self-expanding rubber tube body adopts to sneak into the manufacturing of hydro-expansive rubber material in meeting oily expanded rubber, makes self-expanding rubber tube body when expanding and the Strength Changes of self-expanding rubber tube back pressure ring difference to some extent.The method those skilled in the art that meet the hydro-expansive rubber method of sneaking in the oily expanded rubber, mold pressing and sulfuration know.
Described self-expanding rubber tube back pressure ring is a cylindrical shape, the two ends of self-expanding rubber tube back pressure ring are taper seats, the taper seat of one end and metal ring sulfuration are pressed, the taper seat of the other end and the sulfuration of self-expanding rubber tube body are adjacent to, and self-expanding rubber tube back pressure ring and self-expanding rubber tube body together mold pressing also vulcanize on body.
A kind of thin wall construction that described metal ring is made up of great circle ring body, roundlet ring body and cone-shaped ring body, cone-shaped ring body are connected in the middle of great circle ring body and the roundlet ring body; The internal diameter of great circle ring body is identical with self-expanding rubber tube back pressure ring external diameter; The internal diameter of roundlet ring body is identical with the external diameter of body; The gradient of cone-shaped ring body is identical with the gradient of self-expanding rubber tube back pressure ring outer end; On great circle ring body and cone-shaped ring body, has a continuous axially open at least.When self-expanding rubber tube back pressure ring expands, drive metal ring and expand outwardly simultaneously, the distance at the opening part two ends of metal ring increases.
There is interior scalene cone at the two ends of middle baffle ring, the interior scalene cone at middle baffle ring two ends respectively and the distance between the metal ring be 0～8mm; One end of spacing ring has interior scalene cone, and the interior scalene cone and the distance between the metal ring of spacing ring are 0～8mm.
Reservoir reconstruction is with the preparation process of the high pressure resistant packer of horizontal well: at first the end from body begins mold pressing, self-expanding rubber tube of sulfuration.Evenly smear a layer binder on the body surface, then with self-expanding rubber tube body, self-expanding rubber tube back pressure ring and metal ring mold pressing together, vulcanize surface to body.The instrument and the technology of mold pressing, sulfuration belong to prior art, are not described in detail.
After finishing a self-expanding rubber tube, put one from the end of body in the middle of baffle ring and fix with fastening bolt, the distance between middle baffle ring and the metal ring is 0～8mm; And in the annular space that the roundlet ring body of metal ring forms between middle baffle ring end and outer surface of tube body.
Mold pressing then, the next self-expanding rubber tube of sulfuration.Circulation mold pressing, sulfuration self-expanding rubber tube and fixing middle baffle ring; After finishing last self-expanding rubber tube, overlap a spacing ring respectively from the two ends of body, the distance between spacing ring and the metal ring is 0～8mm, and with fastening bolt spacing ring is fixed.
The speed of expansion of self-expanding rubber tube back pressure ring is identical with the speed of expansion of self-expanding rubber tube body, different with self-expanding rubber tube body is, the material of self-expanding rubber tube back pressure ring intensity in expansion process descends very slow, when self-expanding rubber tube body bulk expansion arrived the borehole wall, self-expanding rubber tube back pressure ring still had higher support strength.Be close to self-expanding rubber tube back pressure ring and together sulfuration be metal ring, self-expanding rubber tube back pressure ring will drive metal ring when expanding and radially expand outwardly together, touch the borehole wall until the self-expanding rubber tube.
Described body comprises API oil pipe and API sleeve pipe.
One row's screw hole is arranged on the baffle ring in the middle of described; Described spacing ring has two row's screw holes, and the position of two row's screw holes is interlaced.
According to on-the-spot down-hole actual conditions, self-expanding rubber can be selected to meet oil or water-swellable material, and compliance is strong.Different reservoirs has different fracture pressures, and is just different to the requirement of the withstand voltage index of packer.According to different withstand voltage indexs, can select the packing element of varying number to make up, very flexible on the structure.After packer machines, coat one deck oil resistant and water-fast protective material, contact with oil or water, cause unexpected the expansion to prevent that packing element is local in transit at the rubber external surface.
The beneficial effects of the utility model: the utility model reservoir reconstruction high pressure resistant packer of horizontal well, adopt the novel high pressure-resistant packer of meeting oil or hydro-expansive rubber developing material, be used for all kinds of unconventional, difficulty is employed the horizontal well in segments reservoir reconstruction construction of petroleum resources, this packer has following characteristics: self-expanding rubber tube back pressure ring 7 structures that (1) is novel: just realized effective support of self-expanding rubber tube 2 by compact structure, the assurance packer is worked under the High Pressure Difference environment reliably, reduce the length of self-expanding rubber tube 2 simultaneously, helped being lowered to smoothly of instrument; (2) Chuan Jie high pressure resistant self-expanding rubber tube 2 unit combination: can be according to actual conditions, the quantity of customization self-expanding rubber tube 2 satisfies on-the-spot different demand; (3) adaptation level well bore hole environment: can be lowered to the erose bore hole borehole wall, when slight the leakage appearred in packer, self-expanding rubber expanded automatically and fills up the packing element slit, rebulids sealing; (4) latus rectum is bigger: with latus rectums such as oil pipe that is connected or sleeve pipes, help pitching during the reservoir reconstruction construction, manage passing through of switching tools continuously, output was higher after the oil gas well was gone into operation, and also more convenient during well workover, the underground work instrument can not blocked in the position of packer; (5) reliability height: mechanical part obtains maximum the simplification, has reduced the risk that occurs in the operation process; (6) cost is low: compare with conventional packer, tool expense is low, and site operation does not need special technique to instruct, and adopts the horizontal well in segments reservoir reconstruction construction service fee of this instrument to reduce greatly, and advantage is more obvious in transforming the more horizontal well application of hop count.
Therefore, this packer application in the horizontal well in segments stimulation technology, for the exploitation of unconventional petroleum resources provides a kind of cost-effective completion tool combination, had good application prospects.
Description of drawings
Fig. 1 is the reservoir reconstruction high pressure resistant packer overall structure of a horizontal well schematic diagram.
Fig. 2 is the structural representation after self-expanding rubber tube 2 expands.
Fig. 3 is the local enlarged diagram of spacing ring 4 and self-expanding rubber tube 2 annexations.
Fig. 4 is the local enlarged diagram of middle baffle ring 6 and self-expanding rubber tube 2 annexations.
Fig. 5 is the axonometric drawing of metal ring 8.
Fig. 6 is metal ring 8 front views.
Fig. 7 is the left view of Fig. 6.
Fig. 8 is spacing ring 4 generalized sections.
Fig. 9 is middle baffle ring 6 generalized sections.
Among the figure, 1. body, 2. self-expanding rubber tube, 3. box cupling, 4. spacing ring, 5. fastening bolt, 6. in the middle of baffle ring, 7. self-expanding rubber tube back pressure ring, 8. metal ring, 9. self-expanding rubber tube body.
The specific embodiment
Embodiment 1: is example with a reservoir reconstruction with the high pressure resistant packer of horizontal well, and the utility model is described in further detail.
Consult Fig. 1.Reservoir reconstruction mainly is made up of body 1, self-expanding rubber tube 2, box cupling 3, spacing ring 4, fastening bolt 5 and middle baffle ring 6 with the high pressure resistant packer of horizontal well.Body 1 adopts 5
1/
2" the API oil pipe of specification, the external diameter 139.7mm of body 1, length 6400mm.There is external screw thread at the two ends of body 1, at an end of body 1 by the box cupling 3 that has been threaded.Self-expanding rubber tube 2 is made up of self-expanding rubber tube back pressure ring 7 metal rings 8 and self-expanding rubber tube body 9.
Mold pressing and sulfuration have three sections self-expanding rubber tubes 2 on body 1 outer wall.Consult Fig. 4.Be fixed with a middle baffle ring 6 of annular by fastening bolt 5 between adjacent two joint self-expanding rubber tubes 2, the distance between middle baffle ring 6 and the metal ring 8 is 7mm, and there is interior scalene cone at the two ends of middle baffle ring 6.Consult Fig. 3.Outer end at two ends self-expanding rubber tube 2 is fixed with a spacing ring 4 respectively by fastening bolt 5, and an end of spacing ring 4 has interior scalene cone, and the distance between spacing ring 4 and the metal ring 8 is 0mm, and promptly spacing ring 4 compresses metal ring 8.
Self-expanding rubber tube 2 external diameter 203mm.Self-expanding rubber tube 2 is made up of self-expanding rubber tube body, self-expanding rubber tube back pressure ring 7 and metal ring 8; Self-expanding rubber tube back pressure ring 7 adopts meets oily expanded rubber, and the material that self-expanding rubber tube body 9 adopts is to sneak into hydro-expansive rubber in meeting oily expanded rubber.The two ends of self-expanding rubber tube back pressure ring 7 are taper seats of 45 degree, the taper seat of one end and metal ring 8 sulfurations, the taper seat of the other end and 9 sulfurations of self-expanding rubber tube body, self-expanding rubber tube back pressure ring 7 and self-expanding rubber tube body 9 together mold pressing also vulcanize on body 1.
Consult Fig. 6.The thin wall construction that metal ring 8 is made up of great circle ring body, roundlet ring body and cone-shaped ring body, cone-shaped ring body are connected in the middle of great circle ring body and the roundlet ring body.The internal diameter of great circle ring body is identical with self-expanding rubber tube back pressure ring 7 external diameters, internal diameter 201mm, i.e. wall thickness 1mm, great circle ring body width width 30mm.The internal diameter of roundlet ring body is identical with the external diameter of body 1; The gradient of cone-shaped ring body is identical with the gradient of self-expanding rubber tube back pressure ring 7 outer ends, wall thickness 1mm, width 25mm.Consult Fig. 7.On great circle ring body and cone-shaped ring body, be distributed with four continuous axially opens symmetrically and evenly.
Consult Fig. 8.Spacing ring 4 has two row's screw holes, and every row has six screw holes, and the position of two row's screw holes is interlaced; Consult Fig. 9.Six screw holes of one row are arranged on the middle baffle ring 6.
Reservoir reconstruction is with the preparation process of the high pressure resistant packer of horizontal well: at first the end from body 1 begins mold pressing, self-expanding rubber tube 2 of sulfuration.Evenly smear a layer binder on body 1 surface, then with self-expanding rubber tube body 9, self-expanding rubber tube back pressure ring 7 and metal ring 8 mold pressing together, vulcanize to the surface of body 1.
After finishing a self-expanding rubber tube 2, put one from the end of body 1 in the middle of baffle ring 6 and fixing with fastening bolt 5, the distance between middle baffle ring 6 and the metal ring 8 is 7mm; And in the annular space that the roundlet ring body of metal ring 8 forms between middle baffle ring 6 ends and body 1 external surface.
Mold pressing then, the next self-expanding rubber tube 2 of sulfuration.Circulation mold pressing, sulfuration self-expanding rubber tube 2 and fixing middle baffle ring 6; After finishing last self-expanding rubber tube 2, overlap a spacing ring 4 respectively from the two ends of body 1, spacing ring 4 compresses metal ring 8, and with fastening bolt 5 that spacing ring 4 is fixing.Finish a reservoir reconstruction high pressure resistant packer of horizontal well.Consult Fig. 1.
Reservoir reconstruction is with the principle of the high pressure resistant packer of horizontal well: the similar hydraulic seal that is operated in the hyperbaric environment.In hyperbaric environment＞40MPa, sealing ring is worked with back-up ring, and back-up ring belongs to stiffener, and main effect is to support the sealing ring that belongs to flexible member, prevents that it is extruded seal groove.Very big pressure reduction is born at packing element two ends in reservoir reconstruction construction, and self-expanding rubber tube body 9 is the weakest places of intensity, minimum annulus area between the spacing ring and the borehole wall.Metal ring in the utility model can radially expand outwardly expansion synchronously with self-expanding rubber tube back pressure ring 7, and the annular gap between obstruction, closed tube 1 and the borehole wall is effectively supported and born the self-expanding rubber tube 2 of High Pressure Difference.Fig. 2 is the structural representation after self-expanding rubber tube 2 expands.
Claims (4)
1. a reservoir reconstruction is with the high pressure resistant packer of horizontal well, mainly form by body (1), self-expanding rubber tube (2), box cupling (3), spacing ring (4), fastening bolt (5) and middle baffle ring (6), there is external screw thread at the two ends of body (1),, it is characterized in that by the box cupling that has been threaded (3) at an end of body (1): mold pressing and sulfuration have 3～8 joint self-expanding rubber tubes (2) on body (1) outer wall; Between adjacent two joint self-expanding rubber tubes (2), be fixed with a middle baffle ring (6) of annular, be fixed with a spacing ring (4) respectively by fastening bolt (5) in the outer end of two ends self-expanding rubber tube (2) by fastening bolt (5);
Self-expanding rubber tube (2) is made up of self-expanding rubber tube body (9), self-expanding rubber tube back pressure ring (7) and metal ring (8); At the two ends of self-expanding rubber tube body (9) self-expanding rubber tube back pressure ring (7) is arranged respectively; Outer wall surface sulfuration at self-expanding rubber tube back pressure ring (7) has metal ring (8).
2. the reservoir reconstruction according to claim 1 high pressure resistant packer of horizontal well, it is characterized in that: described self-expanding rubber tube back pressure ring (7) is cylindrical shape, the two ends of self-expanding rubber tube back pressure ring (7) are taper seats, the taper seat of one end and metal ring (8) sulfuration, the taper seat of the other end and self-expanding rubber tube body (9) sulfuration, self-expanding rubber tube back pressure ring (7) and self-expanding rubber tube body (9) together mold pressing also vulcanize on body (1).
3. the reservoir reconstruction according to claim 1 high pressure resistant packer of horizontal well, it is characterized in that: a kind of thin wall construction that described metal ring (8) is made up of great circle ring body, roundlet ring body and cone-shaped ring body, cone-shaped ring body are connected in the middle of great circle ring body and the roundlet ring body; The internal diameter of great circle ring body is identical with self-expanding rubber tube back pressure ring (7) external diameter; The internal diameter of roundlet ring body is identical with the external diameter of body (1); The gradient of cone-shaped ring body is identical with the gradient of self-expanding rubber tube back pressure ring (7) outer end; On great circle ring body and cone-shaped ring body, has a continuous axially open at least.
According to claim 1,2 or 3 described reservoir reconstructions with the high pressure resistant packers of horizontal wells, it is characterized in that: there is interior scalene cone at the two ends of middle baffle ring (6), the interior scalene cone at middle baffle ring (6) two ends respectively and the distance between the metal ring (8) be 0～8mm; One end of spacing ring (4) has interior scalene cone, and the distance between the interior scalene cone of spacing ring (4) and the metal ring (8) is 0～8mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810635U CN202000955U (en) | 2010-12-17 | 2010-12-17 | Horizontal well high pressure resistant packer for reservoir transformation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810635U CN202000955U (en) | 2010-12-17 | 2010-12-17 | Horizontal well high pressure resistant packer for reservoir transformation |
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| CN202000955U true CN202000955U (en) | 2011-10-05 |
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| CN2010206810635U Expired - Lifetime CN202000955U (en) | 2010-12-17 | 2010-12-17 | Horizontal well high pressure resistant packer for reservoir transformation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071901A (en) * | 2010-12-17 | 2011-05-25 | 中国石油天然气股份有限公司 | Horizontal well high pressure resistant packer for reservoir transformation |
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- 2010-12-17 CN CN2010206810635U patent/CN202000955U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071901A (en) * | 2010-12-17 | 2011-05-25 | 中国石油天然气股份有限公司 | Horizontal well high pressure resistant packer for reservoir transformation |
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