CN109441399A - One kind can sand washing bridge plug - Google Patents

One kind can sand washing bridge plug Download PDF

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Publication number
CN109441399A
CN109441399A CN201811523524.3A CN201811523524A CN109441399A CN 109441399 A CN109441399 A CN 109441399A CN 201811523524 A CN201811523524 A CN 201811523524A CN 109441399 A CN109441399 A CN 109441399A
Authority
CN
China
Prior art keywords
ring
sand washing
central tube
thread
center tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811523524.3A
Other languages
Chinese (zh)
Inventor
李江涛
李海波
任岩岩
杨鹏飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Bo Saite Petrotechnik Ltd
Original Assignee
Shandong Bo Saite Petrotechnik Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Bo Saite Petrotechnik Ltd filed Critical Shandong Bo Saite Petrotechnik Ltd
Priority to CN201811523524.3A priority Critical patent/CN109441399A/en
Publication of CN109441399A publication Critical patent/CN109441399A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/134Bridging plugs

Abstract

The invention discloses one kind can sand washing bridge plug, belong to oilfield exploitation technical field.Including be successively threadedly coupled from top to bottom top connection, upper center tube, intermediate central tube, lower center tube;Lower center tube lower end inside is threaded with ball seat, and ball seat lower thread is connected with intubation, and intubation lower end is equipped with self-locking head;Crossover sub is internally provided with switching sliding sleeve, and switching sliding sleeve upper end is equipped with positioning self-lock switch, is equipped with the first sand washing channel on switching sliding sleeve and transition joint;Transition joint external screw-thread is connected with sand washing housing, and sand washing housing lower thread is connected with mule shoe guide, is equipped with the second sand washing channel inside mule shoe guide.In summary, the present invention realizes the packing to stratum by one-trip string, is not necessarily to the dedicated sand flushing tool of tripping in;Bridge plug uses two-stage piston, and three groups of packing element structures set reliable, success rate height;Switching sliding sleeve sealed reliable is able to bear bidirectional pressure difference, and pressure-bearing is high, simplifies flow chart, improves construction cost rate, reduce operating risk.

Description

One kind can sand washing bridge plug
Technical field
The present invention relates to oilfield exploitation technical fields, and particularly relating to one kind can sand washing bridge plug.
Background technique
With the development process in oil field, oneself enters the middle and later periods of oil field development in most domestic oil field, and oil-water well shakes out It is a universal phenomenon, shakes out and get worse, causes conventional sand washing operation that can not wash down completely sand, then carry out construction work When industry tool still can not tripping in place, cause card tubing string, great construction risk caused to construction operation.Existing conventional punching Sand operation is mainly that the dedicated sand-flushing pipe column of tripping in carries out sand washing operation, and tripping in bridge plug seals target zone again after the completion of sand washing Every the flow chart long construction period, operating risk is big, can not be suitable for the special serious well that shakes out.
Summary of the invention
To solve deficiency in the prior art, the present invention provide one kind can sand washing bridge plug, to the oil gas water well seriously to shake out, Can sand washing bridge plug can tripping in can sand washing bridge plug when in tripping in while sand washing, guarantee bridge plug it is smooth under in place, effectively realize over the ground The packing of layer, simplifies working procedure, shortens construction period, saved operating cost.
In order to solve the above technical problems, present invention offer technical solution is as follows:
The present invention provide one kind can sand washing bridge plug, including be successively threadedly coupled from top to bottom top connection, upper center tube, in Between central tube, lower center tube;The lower center tube lower end outside is threaded with shearing ring, the shearing ring lower end outside screw thread It is connected with central tube;The lower center tube lower end inside is threaded with ball seat, and the ball seat lower thread is connected with intubation, institute It states intubation lower end and is equipped with self-locking head;
The lower thread of the central tube is connected with lower cone, and the lower cone lower end inside connects with being threaded with down Head, the lower contact lower thread coupling adapter, the crossover sub lower end outside is threaded with transition joint, described Crossover sub forms self-locking release groove after being threadedly coupled with transition joint;
The crossover sub is internally provided with switching sliding sleeve, and the switching sliding sleeve upper end is equipped with positioning self-lock switch, described The first sand washing channel is equipped on switching sliding sleeve and transition joint, the self-locking head is inserted into the positioning self-lock switch and is in Locking state, the first sand washing channel is opened at this time;
The transition joint external screw-thread is connected with sand washing housing, and the sand washing housing lower thread is connected with angle and draws Shoes, the mule shoe guide inside are equipped with the second sand washing channel.
Further, the intermediate central tube upper end is set with upper piston;The intermediate central tube connects with the upper piston Contact portion, which sets up separately, is equipped with inlet opening;The lower center tube upper end is set with lower piston, the lower center tube upper end and the lower work Plug contact portion is provided with lower inlet opening.
Further, the lower center tube lower end is set with pressure relief ring, and the lower center tube lower end is equipped with the first relief hole, The pressure relief ring upper end is equipped with the second relief hole, and when the pressure relief ring moves down, second relief hole and the first relief hole connect It is logical.
Further, upper baffle ring is provided on the outside of the top connection, the top connection outer sheath is equipped with back of the body cap, the back of the body cap It is connected with hydraulic cylinder;
Buttless thread is equipped with outside the central tube upper end, the central tube outer cover is equipped with sleeve, the sleeve upper end It is connected with sheath, and is limited by the sheath, the sheath upper end is threadedly coupled with the pressure ring lower end outside;
The hydraulic cylinder lower end is contacted with the pressure ring, when the hydraulic cylinder force moves down, pushes the pressure ring one It rises and moves down;
The upper center tube, upper piston, intermediate central tube, lower piston, lower center tube are placed in and are arranged in the hydraulic cylinder, And pass through the movement of the upper piston and the movement progress hydraulic cylinder of lower piston.
Further, the pressure ring is internally provided with solution sealing joint, and the solution sealing joint lower end is contacted with the central tube, The deblocking connector exterior is arranged with lock ring, and the lock ring is placed between the pressure ring and sheath, and the lock ring is set to described Solve sealing joint and central tube contact portion.
Further, the sleeve lower thread is connected with upper cone, is provided with several packing elements on the outside of the sleeve, adjacent It is provided with spacer ring between two packing elements, is provided with copper cover on the outside of the packing element and spacer ring;
The central tube lower end outside is arranged with slips, spring leaf and slips cover, and slips cover upper end is arranged described Epicone external surface, the lower cone outer surface are provided with interior helmet, and slips cover lower end is threadedly coupled with the interior helmet, The slips, spring leaf are arranged inside the slips cover.
Further, the transition joint lower thread is connected with blind plugging, and lower cone lower end external screw-thread is connected with Baffle ring.
Preferably, the upper center tube and the top connection contact position are provided with the first O-ring, the upper center tube with The hydraulic cylinder contact position is provided with the second O-ring, and the upper center tube and the intermediate central tube contact position are provided with Third O-ring, the intermediate central tube and the hydraulic cylinder contact position are provided with the 4th O-ring, the crossover sub and institute It states intubation contact position and is provided with the 5th O-ring, it is O-shaped that the crossover sub with the transition joint contact position is provided with the 6th Circle, the transition joint and the switching sliding sleeve contact position are provided with the 7th O-ring, and the transition joint connects with the blind plugging Touching position is provided with the 8th O-ring.
Compared with prior art, the invention has the following advantages:
The present invention is connected to oil pipe lower end, is conveyed by oil pipe down toward oil gas water well design position, as met in decentralization process Hindered to sand, by casing anti-flushing well, sand liquid enters the first sand washing channel by the second sand washing channel, after enter by cannula interior Then oil pipe returns out ground by oil pipe, washes down and be put into design position.One-trip string realizes the packing to stratum, is not necessarily to The dedicated sand flushing tool of tripping in.
The present invention can be after sand washing bridge plug transfers to design position, and fixed well head sets steel ball from oil pipe investment, sets steel ball It is seated on ball seat, is suppressed by oil pipe greater than 5MPa, it is hydraulic that upper center tube, intermediate central tube, lower center are entered by top connection Inside pipe, liquid pushes upper piston and lower piston by upper inlet opening, lower inlet opening, and upper piston and lower piston push hydraulic cylinder, Hydraulic Cylinder pressure ring, pressure ring push sheath, then drive lock ring downlink, and lock ring is realized with central tube by unidirectional buttless thread Monodirectional locking, sheath push copper cover, packing element, spacer ring that upper cone is driven to push slips, are realized and limited by casing outside packing element, slips Position, have spring leaf between slips and slips cover, slips anchoring after casing wall, sheath carry out push squeeze copper cover, packing element, every Ring, packing element, which rises, is enclosed in casing wall, realizes the packing of annular space.Bridge plug of the present invention uses two-stage piston, and three groups of packing element structures, setting can It leans on, success rate is high.
Continue to suppress to more than 12MPa after, bridge plug is set completely, and shearing ring is cut, and realization is given up, and lower piston is in hydraulic coupling Under continue traveling downwardly and push pressure relief ring downlink, the liquid in oil pipe above mentions oil by the second relief hole, the first relief hole sleeve pipe Tubing string, tubing string drive intubation uplink, and intubation drives switching sliding sleeve uplink, closes the first sand washing channel, and Simultaneous Switching sliding sleeve is determined Automatic unlocking when position self-lock switch reaches the self-locking release groove of crossover sub lower end, is intubated the self-positioning self-lock switch of lower end self-locking head Middle abjection then proceedes to upper lifting pipe post and plays part of giving up out, and construction terminates.
Present invention process is simple, easy for construction, shortens construction period, reduces construction cost;One-trip string is realized to stratum Packing, be not necessarily to the dedicated sand flushing tool of tripping in;Bridge plug uses two-stage piston, and three groups of packing element structures set reliable, success rate height; Switching sliding sleeve sealed reliable is able to bear bidirectional pressure difference, and pressure-bearing is high, simplifies flow chart, improves construction cost rate, reduces Operating risk.
Detailed description of the invention
Fig. 1 can sand washing bridge plug structural schematic diagram for of the invention;
Fig. 2 is the unidirectional buttless thread partial enlarged view of the portion A central tube and the unidirectional buttless thread partial enlargement of lock ring in Fig. 1 Figure;
Fig. 3 is the cross-sectional view of switching sliding sleeve of the present invention;
Fig. 4 is that central tube of the present invention conciliates sealing joint assembling schematic diagram.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.
The present invention provide one kind can sand washing bridge plug, see Fig. 1-3, including be successively threadedly coupled from top to bottom top connection 1, on Central tube 5, intermediate central tube 10, lower center tube 15;15 lower end outside of lower center tube is threaded with shearing ring 22, shearing ring 22 Lower end outside is threaded with central tube 23;15 lower end inside of lower center tube is threaded with ball seat 19,19 lower thread of ball seat It is connected with intubation 24,24 lower ends of intubation are equipped with self-locking head 53;
The lower thread of central tube 23 is connected with lower cone 32, and 32 lower end inside of lower cone is threaded with lower contact 35, 35 lower thread coupling adapter 36 of lower contact, 36 lower end outside of crossover sub are connect with 39 threaded upper ends of transition joint, are turned After changing-over head 36 is threadedly coupled with transition joint 39, self-locking release is formed between crossover sub 36, transition joint 39 and self-locking head 53 Put slot 52;
Crossover sub 36 is internally provided with switching sliding sleeve 41, and 41 upper end of switching sliding sleeve is equipped with positioning self-lock switch 40, switch The first sand washing channel 43 is equipped on sliding sleeve 41 and transition joint 39, the insertion positioning self-lock switch 40 of self-locking head 53 is interior and in lock Tight state, the first sand washing channel 43 is opened at this time;
39 external screw-thread of transition joint is connected with sand washing housing 46, and 46 lower thread of sand washing housing is connected with mule shoe guide 47, the second sand washing channel 48 is equipped with inside mule shoe guide 47.
The present invention is connected to oil pipe lower end, is conveyed by oil pipe down toward oil gas water well design position, as met in decentralization process Hindered to sand, by casing anti-flushing well, sand liquid enters the first sand washing channel by the second sand washing channel, after enter by cannula interior Then oil pipe returns out ground by oil pipe, washes down and be put into design position.One-trip string realizes the packing to stratum, is not necessarily to The dedicated sand flushing tool of tripping in.
Further, intermediate 10 upper end of central tube is set with upper piston 9;Intermediate central tube 10 and 9 contact portion of upper piston It is provided with inlet opening 7;15 upper end of lower center tube is set with lower piston 14,15 upper end of lower center tube and 14 contact portion of lower piston It is provided with lower inlet opening 13.
Further, 15 lower end of lower center tube is set with pressure relief ring 16, and 15 lower end of lower center tube is equipped with the first relief hole 18, 16 upper end of pressure relief ring is equipped with the second relief hole 17, and when pressure relief ring 16 moves down, the second relief hole 17 is connected to the first relief hole 18.
Further, upper baffle ring 2 is provided on the outside of top connection 1, top connection 1 is arranged with standby cap 3, and back of the body cap 3 is connected with hydraulic Cylinder 11;
Buttless thread 888 is equipped with outside 23 upper end of central tube, 23 outer cover of central tube is equipped with sleeve 28, and 28 upper end of sleeve connects It is connected to sheath 50, turns up to form set edge at the top of sleeve 28, the set of sleeve 28 is along the inside for being located at sheath 50, remaining position of sleeve 28 Positioned at the outside of sheath 50, by covering along the limit for realizing sleeve 28,50 upper end of sheath is threadedly coupled with 49 lower end outside of pressure ring;
11 lower end of hydraulic cylinder is contacted with pressure ring 49, when 11 stress of hydraulic cylinder moves down, pressure ring 49 is pushed to move downwardly together It is dynamic;
Upper center tube 5, upper piston 9, intermediate central tube 10, lower piston 14, lower center tube 15 are placed in and are arranged in hydraulic cylinder 11 It is interior, by the movement of upper piston 9 and lower piston 14, drive the movement of hydraulic cylinder 11.
Further, pressure ring 49 is internally provided with solution sealing joint 20, and claw is arranged in solution 20 lower end of sealing joint, with central tube 23 The card slot of upper end is clamped, and solution 20 outer cover of sealing joint is equipped with lock ring 21, buttless thread 999 is equipped with inside lock ring 21, with central tube Buttless thread 888 outside 23 is used cooperatively, and 21 side of lock ring is placed between pressure ring 49 and sheath 50 to disconnection, lock ring 21.
Further, 28 lower thread of sleeve is connected with upper cone 29, and several packing elements 26 are provided on the outside of sleeve 28, adjacent It is provided with spacer ring 27 between two packing elements 26, is provided with copper cover 25 on the outside of packing element 26 and spacer ring 27;
23 lower end outside of central tube is arranged with slips 31, spring leaf 30 and slips cover 51, and 51 upper end of slips cover is arranged upper 29 outer surface of cone, 32 outer surface of lower cone are provided with interior helmet 33, and 51 lower end of slips cover is threadedly coupled with interior helmet 33, slips 31, spring leaf 30 is arranged inside slips cover 51.There is spring leaf 30 between slips 31 and slips cover 51, it is hydraulic in setting process The downward thrust of cylinder 11 is transmitted to slips 31 and packing element 26 simultaneously, after slips 31 is anchored on casing wall first, is further continued for pushing and squeeze Moulding cylinder 26, which rises, is enclosed in casing wall, realizes the packing of annular space.
The present invention can be after sand washing bridge plug transfers to design position, and fixed well head sets steel ball from oil pipe investment, sets steel ball It is seated on ball seat, is suppressed by oil pipe greater than 5MPa, it is hydraulic that upper center tube, intermediate central tube, lower center are entered by top connection Inside pipe, liquid pushes upper piston and lower piston by upper inlet opening, lower inlet opening, and upper piston and lower piston push hydraulic cylinder, Hydraulic Cylinder pressure ring, pressure ring push sheath, then drive lock ring downlink, and lock ring is realized with central tube by unidirectional buttless thread Monodirectional locking, sheath push copper cover, packing element, spacer ring that upper cone is driven to push slips, are realized and limited by casing outside packing element, slips Position, have spring leaf between slips and slips cover, slips anchoring after casing wall, sheath carry out push squeeze copper cover, packing element, every Ring, packing element, which rises, is enclosed in casing wall, realizes the packing of annular space.Bridge plug of the present invention uses two-stage piston, and three groups of packing element structures, setting can It leans on, success rate is high.
Continue to suppress to more than 12MPa after, bridge plug is set completely, and shearing ring is cut, and realization is given up, and lower piston is in hydraulic coupling Under continue traveling downwardly and push pressure relief ring downlink, the liquid in oil pipe above mentions oil by the second relief hole, the first relief hole sleeve pipe Tubing string, tubing string drive intubation uplink, and intubation drives switching sliding sleeve uplink, closes the first sand washing channel, and Simultaneous Switching sliding sleeve is determined Automatic unlocking when position self-lock switch reaches the self-locking release groove of crossover sub lower end, is intubated the self-positioning self-lock switch of lower end self-locking head Middle abjection then proceedes to upper lifting pipe post and plays part of giving up out, and construction terminates.Switching sliding sleeve sealed reliable, is able to bear Bidirectional pressure Difference, pressure-bearing is high, simplifies flow chart, improves construction cost rate, reduce operating risk.
Further, 39 lower thread of transition joint is connected with blind plugging 45, bridge plug requires to set give up after, tool is up and down not There can be communicating passage, blind plugging 45, which is realized, blocks inner cavity.32 lower end external screw-thread of lower cone is connected with baffle ring 34.
Upper baffle ring and 2 baffle rings 34 are product diameter largest portions, protect the critical components such as packing element and slips during going into the well It is not worn by the borehole wall.
Preferably, upper center tube 5 and 1 contact position of top connection are provided with the first O-ring 4, upper center tube 5 and hydraulic cylinder 11 Contact position is provided with the second O-ring 6, and upper center tube 5 and intermediate 10 contact position of central tube are provided with third O-ring 8, intermediate Central tube 10 and 11 contact position of hydraulic cylinder are provided with the 4th O-ring 12, and crossover sub 36 is provided with 24 contact positions of intubation 5th O-ring 37, crossover sub 36 and 39 contact position of transition joint are provided with the 6th O-ring 38, transition joint 39 and switch 41 contact position of sliding sleeve is provided with the 7th O-ring 42, and transition joint 39 and 45 contact position of blind plugging are provided with the 8th O-ring 44, Realize the sealing of apparatus of the present invention.
In summary, the present invention realizes the packing to stratum by one-trip string, is not necessarily to the dedicated sand flushing tool of tripping in;Bridge plug Using two-stage piston, three groups of packing element structures set reliable, success rate height;Switching sliding sleeve sealed reliable, is able to bear Bidirectional pressure Difference, pressure-bearing is high, simplifies flow chart, improves construction cost rate, reduce operating risk.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (8)

1. one kind can sand washing bridge plug, which is characterized in that including be successively threadedly coupled from top to bottom top connection, upper center tube, in Between central tube, lower center tube;The lower center tube lower end outside is threaded with shearing ring, the shearing ring lower end outside screw thread It is connected with central tube;The lower center tube lower end inside is threaded with ball seat, and the ball seat lower thread is connected with intubation, institute It states intubation lower end and is equipped with self-locking head;
The lower thread of the central tube is connected with lower cone, the lower cone lower end inside and is threaded with lower contact, institute It states lower contact lower thread coupling adapter, the crossover sub lower end outside and is threaded with transition joint, described turn Changing-over head forms self-locking release groove after being threadedly coupled with transition joint;
The crossover sub is internally provided with switching sliding sleeve, and the switching sliding sleeve upper end is equipped with positioning self-lock switch, the switch The first sand washing channel is equipped on sliding sleeve and transition joint, the self-locking head is inserted into the positioning self-lock switch and in locking State, the first sand washing channel is opened at this time;
The transition joint external screw-thread is connected with sand washing housing, and the sand washing housing lower thread is connected with mule shoe guide, institute It states and is equipped with the second sand washing channel inside mule shoe guide.
2. according to claim 1 can sand washing bridge plug, which is characterized in that the intermediate central tube upper end is set with work Plug;The intermediate central tube and the upper piston contact portion are provided with inlet opening;The lower center tube upper end is set with down Piston, the lower center tube upper end and the lower piston contact portion are provided with lower inlet opening.
3. according to claim 2 can sand washing bridge plug, which is characterized in that the lower center tube lower end is set with pressure relief ring, The lower center tube lower end is equipped with the first relief hole, and the pressure relief ring upper end is equipped with the second relief hole, when the pressure relief ring moves down When, second relief hole and the first relief hole are connected to.
4. according to claim 3 can sand washing bridge plug, which is characterized in that be provided with upper baffle ring on the outside of the top connection, institute Top connection outer sheath is stated equipped with back of the body cap, the back of the body cap is connected with hydraulic cylinder;
Buttless thread is equipped with outside the central tube upper end, the central tube outer cover is equipped with sleeve, the sleeve upper end connection There is sheath, and limited by the sheath, the sheath upper end is threadedly coupled with the pressure ring lower end outside;
The hydraulic cylinder lower end is contacted with the pressure ring, when the hydraulic cylinder force moves down, push the pressure ring together to Lower movement;
The upper center tube, upper piston, intermediate central tube, lower piston, lower center tube are placed in and are arranged in the hydraulic cylinder, and lead to Cross the movement of the movement progress hydraulic cylinder of the upper piston and lower piston.
5. according to claim 4 can sand washing bridge plug, which is characterized in that the pressure ring is internally provided with solution sealing joint, institute It states solution sealing joint lower end and the central tube is clamped, the deblocking connector exterior is arranged with lock ring, and the lock ring is placed in the pressure Between ring and sheath, the lock ring is set to the solution sealing joint and central tube contact portion.
6. according to claim 5 can sand washing bridge plug, which is characterized in that the sleeve lower thread is connected with upper cone, Several packing elements are provided on the outside of the sleeve, spacer ring is provided between adjacent two packing element, is provided on the outside of the packing element and spacer ring Copper cover;
The central tube lower end outside is arranged with slips, spring leaf and slips cover, and slips cover upper end is arranged in the epicone External surface, the lower cone outer surface are provided with interior helmet, and slips cover lower end is threadedly coupled with the interior helmet, described Slips, spring leaf are arranged inside the slips cover.
7. according to claim 6 can sand washing bridge plug, which is characterized in that the transition joint lower thread is connected with blind Stifled, lower cone lower end external screw-thread is connected with baffle ring.
8. according to claim 7 can sand washing bridge plug, which is characterized in that the upper center tube and the top connection contact position It installs and is equipped with the first O-ring, the upper center tube and the hydraulic cylinder contact position are provided with the second O-ring, the upper center Pipe is provided with third O-ring, the intermediate central tube and the hydraulic cylinder contact position with the intermediate central tube contact position Be provided with the 4th O-ring, the crossover sub and the intubation contact position are provided with the 5th O-ring, the crossover sub and The transition joint contact position is provided with the 6th O-ring, and the transition joint is provided with the switching sliding sleeve contact position 7th O-ring, the transition joint and the blind plugging contact position are provided with the 8th O-ring.
CN201811523524.3A 2018-12-13 2018-12-13 One kind can sand washing bridge plug Pending CN109441399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811523524.3A CN109441399A (en) 2018-12-13 2018-12-13 One kind can sand washing bridge plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811523524.3A CN109441399A (en) 2018-12-13 2018-12-13 One kind can sand washing bridge plug

Publications (1)

Publication Number Publication Date
CN109441399A true CN109441399A (en) 2019-03-08

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ID=65558186

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811523524.3A Pending CN109441399A (en) 2018-12-13 2018-12-13 One kind can sand washing bridge plug

Country Status (1)

Country Link
CN (1) CN109441399A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111927382A (en) * 2020-08-07 2020-11-13 中国石油大学(北京) Packer (CN)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111927382A (en) * 2020-08-07 2020-11-13 中国石油大学(北京) Packer (CN)

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