CN105064953A - Rapidly degradable bridge plug with degradation-promoting central pipe - Google Patents
Rapidly degradable bridge plug with degradation-promoting central pipe Download PDFInfo
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- CN105064953A CN105064953A CN201510428926.5A CN201510428926A CN105064953A CN 105064953 A CN105064953 A CN 105064953A CN 201510428926 A CN201510428926 A CN 201510428926A CN 105064953 A CN105064953 A CN 105064953A
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Abstract
The invention discloses a rapidly degradable bridge plug with a degradation-promoting central pipe, comprising the central pipe, a first slip base, a first slip, a first cone, a rubber cylinder, a second cone, a second slip, a second slip base, a guide seal, a push cylinder sleeve, a pull rod and a presser block. The central pipe comprises a body, a catalyst cylinder and a plug; all of the central pipe, the first slip base, the first cone, the second cone, the second slip base and the guide seal are made of degradable materials; a catalyst in the catalyst cylinder accelerates decomposition of the degradable materials; by using the bridge plug made of the degradable materials, degradation of the bridge plug is accelerated under the decomposition acceleration action of the catalyst; the bridge plug is reasonable in structure; the degrading speed in oil, low-temperature or low-salinity water environments is satisfied; before production, no plug drilling or fishing is required, and operating efficiency is improved.
Description
Technical field
The present invention relates to the downhole tool technical field of oil-gas field development application, be specifically related to a kind of degradable bridging plug.
Background technology
In formation testing sealing, card layer or fracturing process, often need to use the shutoff that bridging plug realizes perforation or fractured well section.The bridging plug majority of current use can bore or salvagable, after pressing crack construction, need to use oil pipe band downhole tool, bridging plug is entered to bore mill or salvages, discharge the oil reservoir of shutoff, but during field conduct, often occur because of casing deformation boring mill or salvaging failed situation, need to study a kind of degradable bridging plug for this reason, but the dissolving that current degradable metal material exists intensity high is slow, dissolve the fast low problem of intensity, the particularly degradable metal material of high strength, at oil, under the environment of low temperature or low salinity water, degradation speed cannot meet the demands.
Summary of the invention
The object of the present invention is to provide a kind of solve conventional bridging plug sealing after, bridging plug is carried out to the difficulty of boring mill or salvaging before operation, to such an extent as to after pressure break, Oil/gas Well can not be gone into operation the fast degradation bridging plug with short degraded central tube of problem fast.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of degradable bridging plug, comprises central tube, the first slip spider, the first slips, the first cone, packing element, the second cone, the second slips, the second slip spider, pilot seal head, pushing cylinder cover, pull bar and briquetting, wherein:
Described central tube comprises central tube body, be loaded with catalyzer cylinder and the plug of catalyzer, axially a blind hole is formed with along body in the middle part of described central tube body right-hand member, described catalyzer cylinder is arranged in described blind hole, described plug is arranged on described central tube body right-hand member end to close described blind hole, axially a through hole is formed with along body at described plug center, described central tube body left end end outer wall is formed with the first ring-shaped step, the second ring-shaped step is formed on the right side of described first ring-shaped step, make to be formed with annular groove between described first ring-shaped step and described second ring-shaped step, the right side of described first ring-shaped step is formed with interior chamfering and along the circumferential direction caves inward at the knuckle place of described interior chamfering and be formed with a circumferential separation groove,
Described first slip spider, the first slips, the first cone, packing element, the second cone, the second slips and the second slip spider successively right-to-left are sleeved on described central tube body, described first slip spider is press-fitted on described second ring-shaped step right side, and described pilot seal headgear fills and is fixed on described central tube body right-hand member end;
Described pull bar right-hand member is formed with blind hole and is sleeved on described central tube left end, described briquetting is arranged in described annular groove, described pull bar blind hole port inwall extends to form the 3rd ring-shaped step coordinated with described briquetting right side to center, described pushing cylinder cover is sleeved on described pull bar outer wall, described pushing cylinder cover right-hand member inner wall of end has extended to form the 4th ring-shaped step to center, described 4th ring-shaped step right side is press-fitted on the left side of described first slip spider.
Further, the external diameter of the annular groove of described central tube body is less than the external diameter of central tube body.
Further, described central tube body right-hand member end outer wall is formed with the external screw thread cooperatively interacted with the internal thread of described pilot seal head, the outer wall of described plug be formed with the blind bore end inwall of described central tube body on form internal thread and to cooperatively interact external screw thread.
Further, described catalyzer cylinder comprises cylindrical shell and closes the top cover of described cylindrical shell, and the catalyzer be arranged in catalyzer cylinder is at least one in sodium chloride, potassium chloride, acetic acid, formic acid, citric acid, stearic acid, phosphoric acid, hydrochloric acid, sulfuric acid.
Further, described central tube body and plug adopt degradation material to make, described degradation material is at least one in the materials such as magnadure, magnesium copper alloy, magnalium nickel alloy, almag, polycaprolactone, polypropylene, PLA, polyglycolic acid, polyethylene, and the strength of materials preparing described catalyzer cylinder is lower than the strength of materials of the described central tube body of preparation and described plug.
Further, described first slip spider, the first cone, the second cone, the second slip spider and pilot seal head are made by degradation material, and degradation material can be at least one in almag, magnadure, magnesium copper alloy, magnalium nickel alloy.
By regulating Kaolinite Preparation of Catalyst cylinder, central tube body, plug, the first slip spider, first cone, second cone, the material of the second slip spider and pilot seal head and regulate the composition of catalyzer in catalyzer cylinder to meet in uniform temperature, the requirement completing bridging plug degraded in the time, makes subsequent construction operation normally carry out.
Further, described pilot seal head center is axially formed with a through hole be communicated with the through hole on described plug along body.
Further, described first slips and described first slip spider, described second slips and described second slip spider are all fixed on central tube by shear pin.
Further, the left side of described first centrum and the right side of described second centrum are an inclined-plane, by upper lifting rod make described first slips and described second slips be subject to described pilot seal head extruding respectively along described first centrum left side and described second centrum right side slide, contact with internal surface of sleeve pipe formed setting.
Further, described packing element is combined by three pieces of little packing elements, and the rubber shore hardness being positioned at the little packing element at two ends is 85 ~ 95, and the rubber shore hardness being positioned at middle little packing element is 65 ~ 80, make packing element small in ends bear comparatively high thrust, middle little packing element is more easily setting.
The invention has the beneficial effects as follows: this use degradation material makes bridging plug, by catalyzer accelerated decomposition effect accelerate bridging plug degraded, rational in infrastructure, meet the degradation speed under the environment of oil, low temperature or low salinity water, plug need not be bored before operation or salvage, improving operating efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation with the fast degradation bridging plug of short degraded central tube of the present invention;
Fig. 2 is the structural representation of the central tube in the fast degradation bridging plug with short degraded central tube of the present invention;
Fig. 3 is that the catalyzer cylinder with the fast degradation bridging plug of short degraded central tube of the embodiment of the present invention 1 is respectively at 80 DEG C and 100 DEG C of degradation speed curves;
Fig. 4 is that the central tube with the fast degradation bridging plug of short degraded central tube of the embodiment of the present invention 1 is having the degradation curve under catalyzer and catalyst-free condition respectively.
Detailed description of the invention
Below in conjunction with detailed description of the invention, foregoing invention content of the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacement and change, all should comprise within the scope of the invention.
As shown in Fig. 1 ~ 2, this a kind of degradable bridging plug, comprise central tube 1, first slip spider 2, first slips 3, first cone 4, packing element 5, second cone 6, second slips 7, second slip spider 8, pilot seal 9, pushing cylinder cover 11, pull bar 13 and briquetting 12, wherein:
Described central tube 1 comprises central tube body 104, be loaded with catalyzer cylinder 106 and the plug 109 of catalyzer, axially a blind hole 105 is formed with along body in the middle part of described central tube body 104 right-hand member, described catalyzer cylinder 106 is arranged in described blind hole 105, described plug 109 is arranged on described central tube body 104 right-hand member end to close described blind hole 105, axially a through hole 110 is formed with along body at described plug 109 center, described central tube body 104 left end end outer wall is formed with the first ring-shaped step 101, the second ring-shaped step 103 is formed on the right side of described first ring-shaped step, make to be formed with annular groove 102 between described first ring-shaped step 101 and described second ring-shaped step 103, the external diameter of the annular groove of described central tube body 104 is less than the external diameter of central tube body 104, the right side of described first ring-shaped step 101 is formed with interior chamfering and along the circumferential direction caves inward at the knuckle place of described interior chamfering and be formed with a circumferential separation groove 111,
Described first slip spider 2, first slips 3, first cone 4, packing element 5, second cone 6, second slips 7 and the second slip spider 8 successively right-to-left are sleeved on described central tube body 104, described first slips 3 and described first slip spider 2, described second slips 7 is all fixed on central tube by shear pin 10 with described second slip spider 8, described first slip spider 2 is press-fitted on described second ring-shaped step 103 right side, described pilot seal 9 is set with and is fixed on described central tube body 104 right-hand member end, described pilot seal 9 center are axially formed with a through hole be communicated with the through hole 110 on described plug 109 along body, the left side of described first centrum 4 and the right side of described second centrum 6 are an inclined-plane, make described first slips 3 and described second slips 7 be subject to 9 extruding of described pilot seal by upper lifting rod to slide along described first centrum 4 left side and described second centrum 6 right side respectively, contact with internal surface of sleeve pipe formed setting, described packing element 5 is combined by three pieces of little packing elements, and the rubber shore hardness being positioned at the little packing element at two ends is 85 ~ 95, and the rubber shore hardness of the little packing element in centre is between 65 ~ 80,
Described pull bar 14 right-hand member is formed with blind hole and is sleeved on described central tube 1 left end, described briquetting 12 is arranged in described annular groove 102, described pull bar 13 blind hole port inwall extends to form the 3rd ring-shaped step coordinated with described briquetting 12 right side to center, described pushing cylinder cover 11 is sleeved on described pull bar 13 outer wall, described pushing cylinder overlaps 11 right-hand member inner wall of ends and has extended to form the 4th ring-shaped step to center, and described 4th ring-shaped step right side is press-fitted on the left side of described first slip spider 2.
Wherein, described central tube body 104 right-hand member end outer wall is formed with the external screw thread 108 cooperatively interacted with the internal thread of described pilot seal 9, the outer wall of described plug 109 be formed with the blind bore end inwall of described central tube body 104 on form internal thread and to cooperatively interact external screw thread.
On all parts degradation material is selected: described catalyzer cylinder 106 comprises cylindrical shell and closes the top cover of described cylindrical shell, the catalyzer 107 be arranged in catalyzer cylinder 106 is at least one in sodium chloride, potassium chloride, acetic acid, formic acid, citric acid, stearic acid, phosphoric acid, hydrochloric acid, sulfuric acid; Described central tube body 104 and described plug 109 adopt degradation material to make, described degradation material is at least one in the materials such as magnadure, magnesium copper alloy, magnalium nickel alloy, almag, polycaprolactone, polypropylene, PLA, polyglycolic acid, polyethylene, and the strength of materials preparing described catalyzer cylinder 106 is lower than the strength of materials of the described central tube body 104 of preparation and described plug 109; Described first slip spider 2, first cone 4, second cone 6, second slip spider 8 and pilot seal 9 is made by degradation material, and degradation material can be at least one in almag, magnadure, magnesium copper alloy, magnalium nickel alloy.
Below there is for this specific embodiment of the fast degradation bridging plug of short degraded central tube:
A kind of fast degradation bridging plug with short degraded central tube comprises central tube 1, first slip spider 2, first slips 3, first cone 4, packing element 5, second cone 6, second slips 7, second slip spider 8, pilot seal 9, pushing cylinder cover 11, pull bar 13 and briquetting 12, the height of described central tube body 104 is 980mm, external diameter is 110mm, the right-hand member of described central tube body 104 outer wall is formed with the external screw thread 8 that a length is 85mm, in the middle part of described central tube body 104 right-hand member, be axially formed with a length along body is 800mm, internal diameter is the blind hole 105 of 35mm, described catalyzer cylinder 6 is arranged in described blind hole 105, described catalyzer cylinder 106 comprises cylindrical shell and closes the top cover of described cylindrical shell, described catalyzer cylinder 106 for length be 770mm, external diameter is 32mm, internal diameter is 30mm, described plug 109 is a length is 20mm, external diameter is 35mm, wherein be formed centrally the square through hole that an internal diameter is 5 × 5mm, the hole size of described pilot seal 9 is consistent and formed and be communicated with, described plug 109 is arranged on blind hole 105 described in described central tube body 104 end-enclosed, described central tube body 104 blind bore end inwall is formed with the internal thread coordinated with described plug 109 outer wall external screw thread,
Described central tube body 104 left end outer wall is formed with the first ring-shaped step 101, the second ring-shaped step 103 is formed on the right side of described first ring-shaped step 101, make to be formed with annular groove 102 between described first ring-shaped step 101 and described second ring-shaped step 103, the external diameter of described first ring-shaped step 101 is 114mm, the external diameter of described second ring-shaped step 103 is 114mm, the external diameter of described annular groove 102 is 95mm, width is 65mm, all being formed with chamfering in 30 ° in the left side of the right side of described first ring-shaped step 101 and described second ring-shaped step 103 makes the section of described annular groove 102 be a upside-down trapezoid, at the circumferential separation groove 111 that described interior chamfering place (i.e. the right side of described first ring-shaped step 101 and described annular groove 102 bottom surface are formed angle) has along the circumferential direction to be recessed to form downwards, the cup depth of described circumferential separation groove 111 is 1.0mm,
The alloy material that described central tube body 104 and described plug 109 adopt 95wt% magnesium+4.9wt% aluminium+0.1wt% nickel to be formed is made, and its strength of materials is 300MPa, and described catalyzer cylinder 106 adopts poly-lactic acid material to make, and its strength of materials is 35MPa; In described catalyzer cylinder, the catalyzer 107 of splendid attire is 20wt% formic acid+80wt% acetic acid; Described first cone 4, first cone seat 2, second cone 6, second slip spider 8 and pilot seal 9 alloy material adopting 95wtwt% magnesium+4.9wtwt% aluminium+0.1wtwt% nickel to be formed by degradation material are made, and its strength of materials is 300MPa.
This has the operating principle of the fast degradation bridging plug of short degraded central tube:
After catalyzer cylinder 106 is degraded by described catalyzer cylinder 106 inner catalyst 107 by described bridging plug, catalyzer 107 infiltrates into central tube body 104 inwall place, the external diameter of the annular groove 102 of described central tube body 104 is less than the external diameter of central tube body, shorten degradation catalyst 107 time of penetration, make its more easy fracture by breaking groove 111 structure.Central tube body 104 place breaking groove 111 ruptures at first, described catalyzer 107 is made to leak out to central tube body 104 outer wall place, a described pilot seal square central through hole of 9 is communicated with the square balance pipe of the plug of described central tube, catalyzer is exosmosed and accelerates bridging plug degraded;
Described first slips 3, described second slips 7, described first slip spider 2 and described second slip spider 8 are all fixed by shear pin 10, bridging plug is gone into the well in process and does not set;
Go into the well after the described fast degradation bridging plug with short degraded central tube is connected with setting tool, after bridging plug transfers to design attitude, (now pilot seal 9 is positioned at bottom, pull bar is positioned at top), under the promotion of setting tool, pull bar is carried and pulls briquetting that central tube is moved up by pull bar, pushing cylinder cover then keeps motionless, tightly withstand the first slip spider 2 not with central tube to be carried and mobile, when pull bar is carried reach certain pulling force time, fix the first slip spider 2 before, first cone 4, the shear pin 10 of the second cone 6 and the second slip spider 8 is all cut off, central tube is carried, drive a pilot seal 9 promotion lower tile mounting base 8 and cone 6 to move up and compress packing element 5, packing element 5 compresses simultaneously, first slips 3 and the second slips 7 outwards move along the inclined-plane of the first cone 4 and the second cone 6 respectively, slips enlarged outside diameter is engaged formation sets to contact with internal surface of sleeve pipe, now bridging plug is fixed on sleeve pipe,
After pressure break, bottom hole temperature (BHT) raises, and degraded bridging plug starts to decompose in fracturing fluid, until lose sealing function, is started fluid by the layer that bridging plug is closed, and avoids the operation of boring bridging plug or salvaging bridging plug release oil reservoir, wherein, described bridging plug degraded is by selecting different degradable material to make catalyzer cylinder 106, central tube body 104, described plug 109, first slip spider 2, first cone 4, second cone 6, second slip spider 8 and pilot seal 9, ensures the degradation property under its different temperatures, time conditions, two is the decomposition by the catalytic action accelerator activator cylinder 106 of catalyzer 107, central tube body 104 and plug 109 material, described catalyzer cylinder 106 is by the preferential fast decoupled of effect of catalyzer 107, after catalyzer cylinder 106 decomposes leakage, described catalyzer 107 and central tube body 104 contact with plug 109 simultaneously briquetting to self to the pressure effect of central tube under first make fracture groove 111 rupture, catalyzer exosmoses and makes central tube body 104 accelerated decomposition, described plug 109 by the square balance through hole 110 in the center of described plug 109 in described catalyst action accelerated decomposition, simultaneously because the square through hole in square balance through hole 110 and the pilot seal 9 of the center of plug 109 is communicated with, therefore catalyzer 107 penetrates into pilot seal its decomposition of 9 acceleration simultaneously,
In central tube decomposable process, catalyzer is outside seepage progressively, and with upper, the degradable component contact such as the second slip spider and cone of bridging plug, degradable parts are impelled to start to decompose, until packing element loses compressive force and resilience, make bridging plug lose sealing function, started fluid by the layer that bridging plug is closed, deduct the operation of boring bridging plug or salvaging bridging plug release oil reservoir.
As shown in Figure 3, for fast degradation bridging plug central tube in embodiment 1 is having under catalyzer environment and without the degradation curve figure under pressure break pendular ring border respectively, its degradation time (h) is in both environments as shown in table 1 below:
Table 1:
In table 2, curve 1 is decompose tendency chart at catalyzer environment lower center tube, curve 2 is decompose tendency chart at fracturing fluid environment lower center tube, curve tendency trend as can be seen from table in data and Fig. 3, the catalyzer barrel structure design becoming to be equipped with catalyzer accelerates the decomposition rate of central tube greatly.
Slow relative to central tube bulk degradation in the environment of fracturing fluid and formation water, its degradation speed in the environment of catalyzer is accelerated, the first is because material degradation speed in fracturing fluid and formation water environment of Kaolinite Preparation of Catalyst cylinder is fast, it two is that the mechanical strength of Kaolinite Preparation of Catalyst cylinder is low, very easily rupture under certain pressure effect, that catalyzer leads to interior catalyzer leakage, after catalyzer contacts with plug with central tube body, accelerate the decomposition of central tube body and plug, to realize the control of bridging plug sealing and degradation time.In use, central tube is assembled in bridging plug, under behind shaft bottom, catalyzer cylinder is in the environment of fracturing fluid or formation water, under the double action of high temperature and catalyzer, degradation speed is accelerated, because central tube decomposition rate under fracturing fluid and formation water environment is very slow, can ensure hour in, its appearance and size does not change, and when catalyzer cylinder breaks, the work of bridging plug completes, the central tube body that catalyzer and degradation material are made contacts with plug, and central tube body and plug decompose acceleration, starts degraded until all material has decomposed completely.
By regulate the intensity, thickness etc. of the composition of catalyzer and the material of Kaolinite Preparation of Catalyst cylinder can control centre's pipe decomposition rate and use duration.
Be illustrated in figure 2 the catalyzer cylinder degradation speed curve map of the fast degradation bridging plug central tube in downhole temperature 80 DEG C and downhole temperature 100 DEG C, its degradation time (h) sees the following form 2:
Table 2:
In table 2: when curve 1 is down-hole ambient temperature 100 DEG C, catalyzer cylinder decomposes tendency chart, when curve 2 is down-hole ambient temperature 80 DEG C, catalyzer cylinder decomposes tendency chart, curve tendency trend as can be seen from table in data and Fig. 2, central tube prepared by embodiment uses in different temperatures down-hole, and degradation speed is different with degradation time.
Therefore need when preparing this central tube to consider that underground work temperature is to the composition the adjusting catalyzer degradation material different with selection.
In sum, content of the present invention is not limited in the above-described embodiment, and the knowledgeable people in same area can propose other embodiment easily within technological guidance's thought of the present invention, but this embodiment all comprises within the scope of the present invention.
Claims (10)
1. one kind has the fast degradation bridging plug of short degraded central tube, it is characterized in that, comprise central tube (1), the first slip spider (2), the first slips (3), the first cone (4), packing element (5), the second cone (6), the second slips (7), the second slip spider (8), pilot seal head (9), pushing cylinder cover (11), pull bar (13) and briquetting (12), wherein:
Described central tube (1) comprises central tube body (104), be loaded with catalyzer cylinder (106) and the plug (109) of catalyzer, axially a blind hole (105) is formed with along body in the middle part of described central tube body (104) right-hand member, described catalyzer cylinder (106) is arranged in described blind hole (105), described plug (109) is arranged on described central tube body (104) right-hand member end to close described blind hole (105), axially a through hole (110) is formed with along body at described plug (109) center, described central tube body (104) left end end outer wall is formed with the first ring-shaped step (101), the second ring-shaped step (103) is formed on the right side of described first ring-shaped step, make to be formed with annular groove (102) between described first ring-shaped step (101) and described second ring-shaped step (103), the right side of described first ring-shaped step (101) is formed with interior chamfering and along the circumferential direction caves inward at the knuckle place of described interior chamfering and be formed with a circumferential separation groove (111),
Described first slip spider (2), the first slips (3), the first cone (4), packing element (5), the second cone (6), the second slips (7) and the second slip spider (8) successively right-to-left are sleeved on described central tube body (104), described first slip spider 2 is press-fitted on described second ring-shaped step (103) right side, and described pilot seal head (9) is set with and is fixed on described central tube body (104) right-hand member end;
Described pull bar (14) right-hand member is formed with blind hole and is sleeved on described central tube (1) left end, described briquetting (12) is arranged in described annular groove (102), described pull bar (13) blind hole port inwall extends to form the 3rd ring-shaped step coordinated with described briquetting (12) right side to center, described pushing cylinder cover (11) is sleeved on described pull bar (13) outer wall, described pushing cylinder cover (11) right-hand member inner wall of end has extended to form the 4th ring-shaped step to center, described 4th ring-shaped step right side is press-fitted on the left side of described first slip spider (2).
2. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, the external diameter of the annular groove of described central tube body (104) is less than the external diameter of central tube body (104).
3. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described central tube body (104) right-hand member end outer wall is formed with the external screw thread (108) cooperatively interacted with the internal thread of described pilot seal head (9), the outer wall of described plug (109) be formed with the blind bore end inwall of described central tube body (104) on form internal thread and to cooperatively interact external screw thread.
4. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described catalyzer cylinder (106) comprises cylindrical shell and closes the top cover of described cylindrical shell, and the catalyzer (107) be arranged in catalyzer cylinder (106) is sodium chloride, at least one in potassium chloride, acetic acid, formic acid, citric acid, stearic acid, phosphoric acid, hydrochloric acid, sulfuric acid.
5. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described catalyzer cylinder (106), central tube body (104) and plug (109) adopt degradation material to make, described degradation material is magnadure, magnesium copper alloy, magnalium nickel alloy, almag, polycaprolactone, polypropylene, PLA, polyglycolic acid, at least one in the materials such as polyethylene, and the strength of materials preparing described catalyzer cylinder (106) is lower than the strength of materials of the described central tube body (104) of preparation and described plug (109).
6. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described first slip spider (2), first cone (4), second cone (6), second slip spider (8) and pilot seal head (9) are made by degradation material, and degradation material can be at least one in almag, magnadure, magnesium copper alloy, magnalium nickel alloy.
7. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described pilot seal head (9) center is axially formed with a through hole be communicated with the through hole (110) on described plug (109) along body.
8. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described first slips (3) is all fixed on central tube by shear pin (10) with described second slip spider (8) with described first slip spider (2), described second slips (7).
9. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, the left side of described first centrum (4) and the right side of described second centrum (6) are an inclined-plane, make described first slips (3) and described second slips (7) be subject to the extruding of described pilot seal head (9) by upper lifting rod to slide along described first centrum (4) left side and described second centrum (6) right side respectively, contact with internal surface of sleeve pipe formed setting.
10. the fast degradation bridging plug with short degraded central tube according to claim 1, it is characterized in that, described packing element (5) is combined by 3 pieces of little packing elements, and the rubber shore hardness being positioned at the little packing element at two ends is 85 ~ 95, the rubber shore hardness of the little packing element in centre is between 65 ~ 80.
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| CN110513075A (en) * | 2019-08-16 | 2019-11-29 | 中国石油集团长城钻探工程有限公司 | A kind of solvable bridge plug and accelerate bridge plug dissolution can dissolving device |
| CN110656904A (en) * | 2019-09-11 | 2020-01-07 | 中国石油天然气股份有限公司 | Method for accelerating dissolution rate of soluble bridge plug |
| CN113622866A (en) * | 2020-05-06 | 2021-11-09 | 中国石油天然气股份有限公司 | Controllable full-degradable bridge plug |
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| CN105672943B (en) * | 2016-01-20 | 2018-07-10 | 中国石油化工股份有限公司 | A kind of full-bore sliding sleeve with solvable solution structure |
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| CN107869323A (en) * | 2016-09-23 | 2018-04-03 | 深圳市百勤石油技术有限公司 | A kind of solvable bridging plug and its construction technology |
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| CN107724995A (en) * | 2017-11-28 | 2018-02-23 | 西安石油大学 | A kind of mechanical-set half dissolving bridging device and its fracturing process |
| CN109339737A (en) * | 2018-12-07 | 2019-02-15 | 柳江 | A kind of solvable bridge plug of dissolution controllable type |
| CN109339737B (en) * | 2018-12-07 | 2021-08-03 | 大庆市宏博晟达石油机械设备有限公司 | Dissolve soluble bridging plug of controllable formula |
| CN109899028A (en) * | 2019-04-26 | 2019-06-18 | 天津市玛特瑞科技有限公司 | A kind of solvable bridge plug |
| CN110513075A (en) * | 2019-08-16 | 2019-11-29 | 中国石油集团长城钻探工程有限公司 | A kind of solvable bridge plug and accelerate bridge plug dissolution can dissolving device |
| CN110513075B (en) * | 2019-08-16 | 2022-05-06 | 中国石油天然气集团有限公司 | Soluble bridge plug and soluble device for accelerating dissolution of bridge plug |
| CN110656904A (en) * | 2019-09-11 | 2020-01-07 | 中国石油天然气股份有限公司 | Method for accelerating dissolution rate of soluble bridge plug |
| CN113622866A (en) * | 2020-05-06 | 2021-11-09 | 中国石油天然气股份有限公司 | Controllable full-degradable bridge plug |
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