CN205479525U - Check valve in pit - Google Patents

Check valve in pit Download PDF

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Publication number
CN205479525U
CN205479525U CN201620003815.XU CN201620003815U CN205479525U CN 205479525 U CN205479525 U CN 205479525U CN 201620003815 U CN201620003815 U CN 201620003815U CN 205479525 U CN205479525 U CN 205479525U
Authority
CN
China
Prior art keywords
valve core
sliding valve
lower slider
support seat
sealing ring
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.)
Withdrawn - After Issue
Application number
CN201620003815.XU
Other languages
Chinese (zh)
Inventor
朱焕刚
王树江
于海叶
公培斌
李建新
宋中文
赵义
段光辉
宋荣荣
李晓
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.)
Sinopec Oilfield Service Corp
Sinopec Shengli Petroleum Engineering Corp
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Original Assignee
Sinopec Oilfield Service Corp
Sinopec Shengli Petroleum Engineering Corp
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
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 Sinopec Oilfield Service Corp, Sinopec Shengli Petroleum Engineering Corp, Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp filed Critical Sinopec Oilfield Service Corp
Priority to CN201620003815.XU priority Critical patent/CN205479525U/en
Application granted granted Critical
Publication of CN205479525U publication Critical patent/CN205479525U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a check valve in pit, it includes the valve body, goes up the supporting seat, upward smooth movable valve element, gliding movable valve element, under bracing seat, spring and sealing washer, the runner of intercommunication about the inside axial processing of valve body has, it installs on runner upper portion to go up the supporting seat, the under bracing seat is installed in the runner lower part, and the processing of inside axial has the sliding sleeve, spring, gliding movable valve element and upward smooth movable valve element from the bottom up install inside the sliding sleeve in proper order, gliding movable valve element is the step cylinder, go up smooth movable valve element be cylindric, its outer face of cylinder and sliding sleeve sliding connection, inner cylinder face and the movable valve element 's that glides upper end face of cylinder sliding connection, the sealing washer is installed under last smooth movable valve element between terminal surface and the gliding movable valve element step face, forms the crush seal. The utility model has the advantages that adopt metal pair on -metal soft seal form, it is easy to be sealed, pressure helps a structure not only can realize pressurization, can realize the compensation to the sealing washer wearing and tearing moreover.

Description

A kind of down-hole check-valves
Technical field
This utility model relates to petroleum exploration and development drilling well downhole tool, particularly relates to the down-hole check-valves used in a kind of petroleum drilling Completion Operations.
Background technology
Down-hole check-valves is interior jet-preventing tool conventional in oil and gas well drilling, completion and workover treatment, have with pipe and work into well, overflow, well kick or direct circulation is once occurred to stop in operation process, in pipe has, under the effect of reversing pressure and spring force, check-valves cuts out rapidly, block pipe tool internal channel, play the purpose of the interior blowout prevention of pipe tool.In hydraulic oil gas reservoir exploration and development, when strata pressure is more than drilling well liquid columnpressure, in drilling tool, overflow even blowout happens occasionally, and conventional check-valves mainly has arrow-shaped check valve and floating check-valves.In drillng operation, when arrow-shaped check valve is under operating mode of awaiting orders, and flechette-type spool is close to valve seat under spring force, and valve is closed.When drilling fluid direct circulation, the drilling fluid of flowing overcomes valve core spring to try hard to recommend movable valve plug to move downward away from valve seat, and valve is opened, and drilling tool internal channel is unimpeded;When drilling fluid direct circulation stops or overflow, well kick occur, under the effect of spring force and borehole pressure, return that spool is gone here and there is close to valve seat, and valve cuts out, and reaches to close the purpose of drilling tool internal channel.The spool of floating check-valves is valve plate shape, and operation principle is identical with arrow-shaped check valve.
But arrow-shaped check valve and the sealability of floating check-valves, functional reliability and life-span Shortcomings, high-velocity fluid is mingled with the solid phase particles of the high rigidity such as barite or iron filings narrow space between spool and valve seat, cause the erosion attack of spool and valve seat, cause poorly sealed;The one arm curl torsionspring of floating check-valves supporting must be in the valve plate under vacant state, because spring self-supporting power is more weak, makes spring be in eccentric state, unbalance stress, causes sealing property bad, and reset is poor, is difficult to reuse;Being metal sealing between spool and valve seat, processing and surface intractability are big, are frequently present of Seepage under low pressure.
Utility model content
The purpose of this utility model is aiming at the problem that prior art exists, and provides a kind of down-hole check-valves that can improve check-valves high-low pressure sealability, functional reliability and life-span.
For achieving the above object, the following design of this utility model employing:
A kind of down-hole check-valves, including cylindric valve body 1 and the upper support seat 3 being sequentially arranged at from top to down in valve body 1, upper sliding valve core 5, spring 9, lower support seat 10, wherein: lower seat 10 top that supports is provided with sliding sleeve 15, it is provided with gap between sliding sleeve 15 and valve body 1, the lower support seat 10 that sliding sleeve 15 is inside and outside is respectively equipped with the central duct 17 and by-pass duct 16 connected up and down;Upper sliding valve core 5 bottom is provided with lower slider spool 8, sealing ring A7 is installed between upper sliding valve core 5 lower end and lower slider spool 8, it is internal that upper sliding valve core 5, sealing ring A7, lower slider spool 8 and spring 9 are sequentially arranged at sliding sleeve 15 from top to bottom, upper sliding valve core 5, sealing ring A7 and lower slider spool 8 constitute the sealing that slides axially and coordinate with sliding sleeve 15, and upper sliding valve core 5, sealing ring A7 and lower slider spool 8 stretch out rear upper support seat 3, valve body 1 inwall with top from sliding sleeve 15 and constitute slipper seal and coordinate;Upper support seat 3 is axially arranged with water conservancy diversion duct 12, and upper sliding valve core 5 is provided with pressure balance through hole 14.
Such scheme farther includes:
Upper sliding valve core 5 top is spacing by the limited block 4 installed on the guide bar, and upper sliding valve core 5 slides between limited block 4 and lower slider spool 8.
The upper surface of described upper sliding valve core 5 is machined with conical surface A, and upper support seat 3 lower end is machined with conical surface B, forms conical surface seal with the conical surface B when conical surface A contacts;By sealing ring B2 axial seal between described upper support seat 3 external cylindrical surface and valve body 1.
The cylinder top, upper end of described lower slider spool 8 is provided with guide post, and guide post constitutes axial sliding fit with upper support seat 3 after upper sliding valve core 5;Upper sliding valve core 5 lower end and lower slider spool 8 upper end constitute partially sealed grafting and coordinate, and sealing ring A7 is arranged between sliding valve core 5 lower surface and lower slider spool 8 step surface, forms crush seal.
Forming trapezoid space between upper sliding valve core 5 lower surface, lower slider spool 8 step surface, sealing ring A7 cross section is trapezoidal.
Equipped with sealing ring C6 between upper sliding valve core 5 and lower slider spool 8 grafting involutory surface.
The utility model has the advantages that employing metal, to nonmetallic soft seal form, easily seals;Lower slider spool is crush seal circle under the common effect of spring and check-valves low pressure, and this kind of pressure helps seal structure to be possible not only to realize high pressure sealing, and can realize the compensation to ring wear;Under check-valves open mode, spool valve seat area of passage is big, and crush seal enters lower support in seat sliding sleeve, can effectively prevent fluid to sealing the erosion at position, increase check-valves service life;Flechette-type between upper sliding valve core and upper support seat is sealed into hard sealing, coordinates soft seal to define the two seals form of check-valves, enhances the reliability that check-valves uses.
Accompanying drawing explanation
Fig. 1 is this utility model one down-hole check-valves open mode structural representation.
Fig. 2 is this utility model one down-hole closure of check ring status architecture schematic diagram.
1. valve body in figure, 2. sealing ring B, 3. upper support seat, 4. limited block, 5. goes up sliding valve core, 6 sealing ring C, 7. sealing ring A, 8. lower slider spool, 9. spring, 10. time support seat, 11. runners, 12. water conservancy diversion ducts, 13. ducts, 14. pressure balance ducts, 15. sliding sleeves, 16. by-pass ducts, 17. central duct.
Detailed description of the invention
Below in conjunction with the accompanying drawings 1 and accompanying drawing 2 this utility model is further described:
A kind of down-hole check-valves includes valve body 1, upper support seat 3, upper sliding valve core 5, lower slider spool 8, lower support seat 10, spring 9 and sealing ring A 7;Valve body 1 is cylindrical, and inside is axially machined with the runner 11 connected up and down, and top and bottom are threaded respectively and realize and the connection of upper down tube tool;Upper support seat 3 is arranged on runner 11 tops, cylindrical, to threaded between its external cylindrical surface and the runner 11 of valve body 1, inside is axially machined with the water conservancy diversion duct connected up and down 12;Lower support seat 10 is arranged on runner 11 bottom, cylindrical, threadeds between its external cylindrical surface and the runner 11 of valve body 1, and inside is axially machined with sliding sleeve 15 and the by-pass duct connected up and down 16;Sliding sleeve 15 is positioned at lower support seat 10 upper end, and lower support seat 10 is machined with central duct 17, the lower space of sliding sleeve 15 with lower support seat 10 is connected by central duct 17;It is internal that spring 9, lower slider spool 8 and upper sliding valve core 5 are sequentially arranged at sliding sleeve 15 from top to bottom;Lower slider spool 8 is the stepped cylindrical body in "convex" shaped shape, and the cylindrical diameter in its upper end is less than the cylindrical diameter in lower end, and its face of cylinder, lower end is connected with sliding sleeve 15 slipper seal;Cylindrically, its external cylindrical surface is connected upper sliding valve core 5 with sliding sleeve 15 slipper seal, and inner cylinder face is slidably connected with the face of cylinder, upper end of lower slider spool 8;Sealing ring A 7 is arranged between sliding valve core 5 lower surface and lower slider spool 8 step surface, forms crush seal.
Forming trapezoid space between upper sliding valve core 5 lower surface, lower slider spool 8 step surface and valve body 1 inwall, sealing ring A 7 cross section is trapezoidal.The upper surface of upper sliding valve core 5 is machined with conical surface A, and upper support seat 3 lower end is machined with conical surface B, lower slider spool 8, sealing ring A 7 and upper sliding valve core 5 move up, when conical surface A contacts with conical surface B formed conical surface seal;Sealing ring B 2 is utilized to realize fluid axial seal between upper support seat 3 external cylindrical surface and valve flowing channel 11.Sliding surface between upper sliding valve core 5 and lower slider spool 8 utilizes sealing ring C6 to realize fluid-tight.Process guide post on the cylinder top, upper end of lower slider spool 8, guide post is cylindrical, the most identical with lower slider spool 8 moving direction;Upper support seat 3 is axially machined with duct 13, guide post inserts duct 13 and realizes the guiding of the righting to lower slider spool 8;Limited block 4 is installed on the guide bar, and upper sliding valve core 5 slides between limited block 4 and lower slider spool 8.
The internal pressure balance duct 14 that axially processing connects up and down of conical surface A at upper sliding valve core 5, is used for reducing resistance when upper sliding valve core 5 slides up and down.
Fluid flows (flowing to as illustrated by the arrows in fig. 1) from top to bottom from runner 11, and check-valves is opened, and fluid is successively through water conservancy diversion duct 12 and by-pass duct 16 enter check-valves bottom, sliding valve core 5 on fluid forces, sealing ring A 7 and lower slider spool 8 enter in the lower sliding sleeve 15 supporting seat 10, and spring 9 is also compressed;Sealing ring A7 enters sliding sleeve 15 and can effectively prevent fluid to sealing the erosion at position, increases check-valves service life.
When fluid stops circulation, spring 9 promotes lower slider spool 8, sealing A 7 and upper sliding valve core 5 to enter the runner 11 of valve body 1, the conical surface A of upper sliding valve core 5 stops mobile after touching the conical surface B of upper support seat 3, lower slider spool 8 is crush seal circle A 7 under the common effect of spring force and lower flow pressure, sealing between sliding valve core 5, lower slider spool 8 and valve body 1 inwall in formation;Forming first between upper sliding valve core 5, lower slider spool 8 and valve body 1 inwall to seal, conical surface A and conical surface B forms second and seals;Lower slider spool 8 is crush seal circle A7 under the common effect of spring 9 and check-valves lower flow pressure, and this kind of pressure helps seal structure to be possible not only to realize high pressure sealing, and can realize the compensation to ring wear;The version of two seals enhances the reliability that check-valves uses.

Claims (6)

1. a down-hole check-valves, the upper support seat (3) that including cylindric valve body (1) and is sequentially arranged at from top to down in valve body (1), upper sliding valve core (5), spring (9), lower support seat (10), it is characterized in that: under support seat (10) top and be provided with sliding sleeve (15), it is provided with gap between sliding sleeve (15) and valve body (1), the lower support seat (10) that sliding sleeve (15) is inside and outside is respectively equipped with the central duct (17) and by-pass duct (16) connected up and down;Upper sliding valve core (5) bottom is provided with lower slider spool (8), sealing ring A(7 is installed between upper sliding valve core (5) lower end and lower slider spool (8)), upper sliding valve core (5), sealing ring A(7), it is internal that lower slider spool (8) and spring (9) are sequentially arranged at sliding sleeve (15) from top to bottom, upper sliding valve core (5), sealing ring A(7) and lower slider spool (8) and sliding sleeve (15) constitute the sealing that slides axially and coordinate, and upper sliding valve core (5), sealing ring A(7) and lower slider spool (8) from sliding sleeve (15) stretch out after and the upper support seat (3) of top, valve body (1) inwall constitutes slipper seal and coordinates;Upper support seat (3) is axially arranged with water conservancy diversion duct (12), and upper sliding valve core (5) is provided with pressure balance through hole (14).
Down-hole the most according to claim 1 check-valves, it is characterised in that: upper sliding valve core (5) top is spacing by the limited block (4) installed on the guide bar, and upper sliding valve core (5) slides between limited block (4) and lower slider spool (8).
Down-hole the most according to claim 1 and 2 check-valves, it is characterised in that: the upper surface of described upper sliding valve core (5) is machined with conical surface A, and upper support seat (3) lower end is machined with conical surface B, forms conical surface seal with the conical surface B when conical surface A contacts;By sealing ring B(2 between described upper support seat (3) external cylindrical surface and valve body (1)) axial seal.
Down-hole the most according to claim 3 check-valves, it is characterised in that: the cylinder top, upper end of described lower slider spool (8) is provided with guide post, and guide post constitutes axial sliding fit with upper support seat (3) afterwards through upper sliding valve core (5);Upper sliding valve core (5) lower end and lower slider spool (8) upper end constitute partially sealed grafting and coordinate, sealing ring A(7) it is arranged between sliding valve core (5) lower surface and lower slider spool (8) step surface, form crush seal.
Down-hole the most according to claim 4 check-valves, it is characterised in that: upper formation trapezoid space, sealing ring A(7 between sliding valve core (5) lower surface, lower slider spool (8) step surface) cross section is trapezoidal.
Down-hole the most according to claim 4 check-valves, it is characterised in that: above equipped with sealing ring C(6 between sliding valve core (5) and lower slider spool (8) grafting involutory surface).
CN201620003815.XU 2016-01-06 2016-01-06 Check valve in pit Withdrawn - After Issue CN205479525U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620003815.XU CN205479525U (en) 2016-01-06 2016-01-06 Check valve in pit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620003815.XU CN205479525U (en) 2016-01-06 2016-01-06 Check valve in pit

Publications (1)

Publication Number Publication Date
CN205479525U true CN205479525U (en) 2016-08-17

Family

ID=56663807

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620003815.XU Withdrawn - After Issue CN205479525U (en) 2016-01-06 2016-01-06 Check valve in pit

Country Status (1)

Country Link
CN (1) CN205479525U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106949264A (en) * 2016-01-06 2017-07-14 中石化石油工程技术服务有限公司 A kind of underground check-valves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106949264A (en) * 2016-01-06 2017-07-14 中石化石油工程技术服务有限公司 A kind of underground check-valves
CN106949264B (en) * 2016-01-06 2019-12-13 中石化石油工程技术服务有限公司 Underground check valve

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned
AV01 Patent right actively abandoned

Granted publication date: 20160817

Effective date of abandoning: 20191213