CN1580483A - Method for replacing main control valve of wellhead device under pressure and used blanking plug - Google Patents
Method for replacing main control valve of wellhead device under pressure and used blanking plug Download PDFInfo
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- CN1580483A CN1580483A CN 200410022568 CN200410022568A CN1580483A CN 1580483 A CN1580483 A CN 1580483A CN 200410022568 CN200410022568 CN 200410022568 CN 200410022568 A CN200410022568 A CN 200410022568A CN 1580483 A CN1580483 A CN 1580483A
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Abstract
The invention belongs to a method for replacing a main control valve under pressure in an oil (gas) extraction wellhead device and a used blanking plug, wherein the method comprises the steps of installing a blanking plug body, blocking an oil outlet channel of an oil pipe head, converting a fixed part of a solenoid, detaching the main control valve and replacing a new valve; the blanking plug comprises a blanking plug body with a fixed head, a shell, a bearing, a nut sleeve and a hand wheel seat, a screw tube, a clamping groove, an expansion ring adjusting rod, an expansion ring, a pressure measuring and relieving mechanism, a transitional fixing frame comprising a fixed rod group, a fixed seat and a fixed plate, and a fixing clamp. The invention has the characteristics of convenient valve changing operation, safety, reliability, wide application range, short construction time in any pressure state, low cost, no need of killing the well and stopping production, no formation pore blockage and the like. The sequela of background technology or shut-in and production stoppage caused by need of killing well, easy formation pore blockage and the like is overcome; or poor safety, difficult operation and can only be used on low pressure wellhead devices; or the valve can only be used for local maintenance of the main control valve, and the valve can not be replaced.
Description
Technical field
The invention belongs to oil (gas) field oil recovery (gas) wellhead assembly changes the method for its main control valve in working order down and adopts the required blanking plug of this method.Be particluarly suitable under the high pressure conditions its main control valve being changed; Also can be used in the wellhead assembly that underground water gathers replacing, maintenance to its gate valve.
Background technology
Oil recovery (gas) wellhead assembly in oil (gas) field is the master switch of oil recovery (gas) well well head, and it is by tubing head, and little four-way and some gate valves are formed.Wherein be positioned at the main control valve (being generally valve 1,2, No. 3) of the most critical of tubing head export department if leak, no matter be that valve body, valve gap or joint ring leak, all can make whole well head be in no-console condition, the heavy well head accident that then causes, threaten well site and personal safety, gently then cause subterranean resource waste, contaminated environment.Because wellhead assembly is the direct collection (switching) of controlling the OIH (gas) that is in high extremely nearly 100MPa high pressure conditions, and is promptly in running order once installing, thus very difficult to maintenance, the replacing of main control valve.The method that generally adopts is that valve or maintenance are changed in kill-job at present, promptly before changing valve, maintenance, injects mud earlier in well, and makes mud column pressure be slightly larger than OIH (gas) pressure, changes valve again after waiting to keep stablizing and handles.Adopt that this method should be employed a tremendous amount of manpower, material resources, must stop production again and carry out, and after the kill-job since in the construction mud impurity stop up formation pore, often to reduce oil (gas) output, even cause stripper well to become dried-up well.In addition, also have the slips of employing location stuck point to change valve or maintenance, this method is engaged in the sealing of tube head inwall fixed point by slip insert; But because the tubing head runner corrodes because of long-term work suffers acid medium, its inwall is often uneven, the selection of stuck point position is difficult, poor reliability, the safety of dop and inwall engagement do not have guarantee again, and take out difficulty after changing valve, therefore, this method generally is only limited to well and forces down on oil in 20MPa, the gas well mouth device and use.At above-mentioned disadvantage, the applicant is in the patent documentation of ZL97210149.7 in the patent No., a kind of " wellhead assembly gate valve maintenance endoporus blanking plug " disclosed, this blanking plug comprises the blanking plug body of flanged fixing head, housing, bearing group and nut sleeve, handwheel, screwed pipe and be located at the adjusting screw(rod) of band packing pressure head in the screwed pipe, packing, pressure measurement, pressure relief means thereon, handwheel.And the method for maintenance main control valve be influent stream road with main control valve serves as to stop up the zone, promptly main control valve that at first will be to be repaiied is closed, is taken off this valve outlet end flanges lid or produces valve, then the blanking plug sealing is anchored on the flange of the port of export, and will stop up head by the propelling screwed pipe and send in the valve outlet runner, valve opening being passed plug simultaneously the valve body center delivers to back in the valve body intake channel, rotates the packing control lever with the extruding packing again, make it expanded radially the influent stream road is stopped up, thereby block underground high-pressure fluid; Just can comprise the maintenance process of changing valve gap, flashboard, joint ring etc. to gate valve this moment, handles the back reverse operating this gate valve is resumed work.Though this blanking plug and obstruction method have the kill-job of not needing, stop production, save time, can effectively avoid the sequelae of kill-job maintenance and can be used for characteristics such as maintenance to the high-pressure well mouth apparatus main control valve.But because this blanking plug is fixed on the flange of the main control valve port of export, valve body can't be unloaded, can only carry out the part maintenance to main control valve, can not change valve and unload valve body and valve seat is repaired etc., thereby have narrow application range, can not solve the replacing of main control valve, also can not unload defectives such as carrying out full maintenance whole valve body.
Summary of the invention
The objective of the invention is defective at the background technology existence, improve the method and the used blanking plug of a kind of wellhead assembly replace with pressure main control valve of design, also can under condition of high voltage, carry out to reach the replace with pressure main control valve that do not stop production, and safe, easy to operate, reliable, purpose such as change valve efficient height, the time is short, cost is low.Carry out thereby overcome that background technology exists or must kill-job stop production, human and material resources are wasteful, easily reduce oily (gas) well production; Maybe can only change valve processing and inconvenient operation, poor stability, maybe can only carry out modular repair and can not change disadvantages such as valve main control valve to the low pressure wellhead assembly.
Solution of the present invention is that the blocking position that will change in the valve operation moves to going out in the runner of tubing head, simultaneously screwed pipe is fixed in transitional fixed mount on the tubing head body, screw rod is anchored on fixedly card on the tubing head, so that unload main control valve together with packing adjusting rod, packing before unloading the master control gate valve increasing by one on the basis of former blanking plug.Therefore, the inventive method comprises:
A, installation blanking plug body: closing the production valve that unloads its blind flange under the situation of main control valve to be changed or be attached thereto; Blanking plug screwed pipe and packing insertion main control valve are gone out in the runner, simultaneously the fixing head of blanking plug flange are fastenedly connected with main control valve port of export flange seal;
B, stop up tubing head and go out runner: open main control valve, after by screwed pipe packing and packing pressure head being delivered to tubing head and gone out in the runner, rotate the packing adjusting rod, make the packing expanded radially to seal out runner; Open needle-valve in release, the pressure measurement mechanism then with the residual voltage emptying in the main control valve;
C, conversion screwed pipe fixed position;
A, mounting and fixing support and fastening screwed pipe: be anchored on the tubing head fixed bar group one end is removable, the other end then is tightened to one by fixed head with itself and screwed pipe;
B, the fixing card of dress: unload main control valve and tubing-head adapter flange connecting bolt and main control valve is pulled away from tubing head by rotating thread bush, fixedly snap ring shape is anchored on it on tubing head with bolt after snapping in holddown groove on the screwed pipe then, will the axial restraint position of screwed pipe being transferred between main control valve and the tubing head;
D, unload main control valve to be changed: remove fixed head, with blanking plug body and main control valve together or after splitting out both be connected priority unload from screwed pipe;
E, new valve changes the outfit: be inserted on the screwed pipe after the new valve that will be in opening is tightened to one with the fixing head sealing of the blanking plug flange that unloads, by fixed head screwed pipe and each fixed bar be tightened to one again; Contrary operation then, that is: take off fixing card → new valve seal is anchored on the tubing-head adapter flange → unclamps packing and it is retreated to new valve go out to close behind its pressure of runner → detections being connected of new valve → unlatchings needle-valve emptying residual voltage → dismounting fixed mount and blanking plug body and new valve and screwed pipe and packing are withdrawed from → load onto new valve blind flange or production valve from new valve.
The used blanking plug of the method for above-mentioned replace with pressure main control valve comprises the blanking plug body of flanged fixing head, housing, bearing group and nut sleeve, handwheel seat, screwed pipe and be located at the adjusting screw(rod) of the band packing pressure head in it, packing, release, pressure measurement mechanism, handwheel; Key is that this blanking plug also comprises the transitional fixed mount that contains fixed bar group and holder, fixed head, can be anchored on screw rod the fixedly card on the tubing head; On screwed pipe, also be provided with an annular slot near cup ring part; The two ends of fixed bar group detachably are fastenedly connected with holder and fixed head respectively, and fixedly snap ring shape is stuck in interior then being fastenedly connected by bolt and tubing head port of export flange of draw-in groove on the screwed pipe.Described holder is to be provided with the tubing head body that the two sides flange connects screw.Described fixed bar group is that 3～4 two ends are screw thread, and the one end can be connected the straight-bar of screw secure fit with tubing head two sides flange.And fixing card is the opposite opened plate body of two semi-round ring shapes.
The present invention is owing to set up transitional fixed mount and fixing card on the basis of former blanking plug, and will stop up and a little be located in the tubing head runner, through transfer, make gate valve to be changed can make things convenient for, unload from tubing head reliably and change or full maintenance to the screwed pipe fixed position.Change valve from overcoming background technology or needing kill-job to stop production, human and material resources are wasteful, easily cause obstruction, reduction oil (gas) output to formation pore; Or poor stability, operating difficulties, can only on the low pressure wellhead assembly, use; Maybe can only be used for main control valve is carried out modular repair, can not change valve and unload valve body it such as is repaired at disadvantage comprehensively.And it is easy to operate, safe and reliable to have a valve of changing, applied widely, can on the wellhead assembly under any pressure state, use, engineering time weak point, expense are only changed 1/10th of valve for kill-job, and do not need kill-job to stop production, the characteristics such as sequelae that more can not cause formation pore to stop up.
Accompanying drawing and description of drawings
Fig. 1 is a plug structure schematic diagram of the present invention;
Fig. 2 is connected with main control valve and the block part schematic diagram for blanking plug body of the present invention.
Among the figure: 1, blanking plug body, 1～1, the fixing head of flange, 1～2, housing, 1～3, bearing, 1～4, nut sleeve, 1～5, the handwheel seat, 2, screwed pipe, 2～1, keyway, 2～2, draw-in groove, 3, release, pressure measurement mechanism, 4, main control valve to be changed, 5, fixing card, 6, tubing head, 6～1, the tubing head runner, 7, packing, 8, packing adjusting rod, 8～1, pressure head, 8～2, the handwheel seat, 9, flat key, 10～1, fixed bar, 10～2, fixed head.
Embodiment
Present embodiment presses for the KQ70 wellhead assembly changes main control valve that to change the valve method be example with the model with blanking plug and band thereof:
Fixing 1～1 of blanking plug body 1 and flange thereof, housing 1～2, bearing 1～3, thread bush 1～4, handwheel seat 1～5, release, pressure measurement mechanism 3, flat key 9 is all same with background technology (ZL9721014.7).Screwed pipe 2 long 1750mm long 1045mm of external screw thread on it, key 2～1 long 1125mm, draw-in groove 2～2 groover rot diameter φ 48mm, axially long 100mm, outer end and fixed head 10～2 cooperation places are the capable multidiameter that becomes of optical axis and the body of diameter phi 48mm, all the other and background technology with; Packing adjusting rod 8 long 2010mm all the other also with background technology with.The handwheel employing activity handwheel that cooperates with above-mentioned handwheel seat 1～5 and 8～2, put during use, with after take off so as the operation.Fixed bar 10～1 present embodiments in the transitional fixed mount are 4 long 2200mm, the straight-bar of diameter phi 36mm, long 120mm is respectively established at the body rod two ends, the screw thread of M36, fixed head 10～2 diameter phi 480mm, thick 55mm, every interval 90 degree are established through hole, the two hole diagonal distance 403mm of 4 diameter phi 38mm, the center-hole diameter φ 48.5mm that cooperates with screwed pipe 2 altogether on it; Present embodiment adopts the holder of tubing head 6 as transitional fixed mount, promptly with 4 in the Double-face flange connecting hole on it (totally 12) screws as the fixed bar connecting hole.Packing 7 present embodiments adopt external diameter φ 64mm, an internal diameter 34mm, the axial nitrile rubber circle of long 45mm.
Present embodiment is an example to change the PPF65-70 main control valve:
A, at first close valve body 4 to be changed, unload and screwed pipe 2 inserted valve bodies together with packing 7 behind the production valve of its outer end and go out runner, and fixing 1～1 of the flange of blanking plug body 1 is tightened to one (Fig. 2) with this valve flange seal with bolt;
B, unlatching valve 4 to be changed are placed in handwheel seat 1～5 rotating nut cover 1～4 with handwheel screwed pipe 2 ends and packing 7 are delivered in the tubing head runner 6～1 (Fig. 2), and rotary regulating lever 8 presses packing 7 to seal runner 6～1 simultaneously; Open needle-valve in release, the pressure measurement mechanism 3 then with the residual voltage emptying in the valve body;
The fixed position of C, conversion screwed pipe 2: a, at first unload the next one at two bolts in every interval, valve both sides, the two sides of tubing head 6, totally 4, and be anchored on 4 fixed bars in the screw respectively; After again fixed head 10～2 being placed on the outer end of screwed pipe 2 and each fixed bar 10～1, fastening by the nut balance, make plate body axially press screwed pipe 2 after; B, unload the flange bolt of valve to be changed 4 and tubing head 6 and rotate thread bush 1～4 valve 4 to be changed is pulled away from tubing head 6, again the fixing card 5 of two opposite openeds is stuck in draw-in groove 2～2 backs and it is anchored on the tubing head 6, thereby will be transferred to this position the axial restraint of screwed pipe 2 with bolt;
D, unload valve to be changed: after removing the flange bolt of fixing 1～1 of fixed head 10～2 and flange and valve 4 to be changed, respectively blanking plug body 1 and valve to be changed 4 are taken off from screwed pipe 2;
E, renew valve: with model be the new valve of PPF65-70 go out fixing 1～1 of the flange of head piece flange and blanking plug body 1 fastening and open new valve after, together be placed on the screwed pipe 2; Below new valve can be changed with aforementioned program contrary operation.At last the head of screwed pipe 2 and packing 7 are retreated to new valve and go out in the runner, close new valve, detect, after the release, take off blanking plug body 1 through release, pressure measurement mechanism 3 again, transfer to screwed pipe 2 and packing 7, load onto the production valve.
Claims (5)
1, a kind of method of wellhead assembly replace with pressure main control valve; It is characterized in that this method comprises:
A, installation blanking plug body: closing the production valve that unloads its blind flange under the situation of main control valve to be changed or be attached thereto; Blanking plug screwed pipe and packing insertion main control valve are gone out in the runner, simultaneously the fixing head of blanking plug flange are fastenedly connected with main control valve port of export flange seal;
B, stop up tubing head and go out runner: open main control valve, after by screwed pipe packing and packing pressure head being delivered to tubing head and gone out in the runner, rotate the packing adjusting rod, make the packing expanded radially to seal out runner; Open needle-valve in release, the pressure measurement mechanism then with the residual voltage emptying in the main control valve;
C, conversion screwed pipe fixed position;
A, mounting and fixing support and fastening screwed pipe: be anchored on the tubing head fixed bar group one end is removable, the other end then is tightened to one by fixed head with itself and screwed pipe;
B, the fixing card of dress: unload main control valve and tubing-head adapter flange connecting bolt and main control valve is pulled away from tubing head by rotating thread bush, fixedly snap ring shape is anchored on it on tubing head with bolt after snapping in holddown groove on the screwed pipe then, will the axial restraint position of screwed pipe being transferred between main control valve and the tubing head;
D, unload main control valve to be changed: remove fixed head, with blanking plug body and main control valve together or after splitting out both be connected priority unload from screwed pipe;
E, new valve changes the outfit: be inserted on the screwed pipe after the new valve that will be in opening is tightened to one with the fixing head sealing of the blanking plug flange that unloads, by fixed head screwed pipe and each fixed bar be tightened to one again; Contrary operation then, that is: take off fixing card → new valve seal is anchored on the tubing-head adapter flange → unclamps packing and it is retreated to new valve go out to close behind its pressure of runner → detections being connected of new valve → unlatchings needle-valve emptying residual voltage → dismounting fixed mount and blanking plug body and new valve and screwed pipe and packing are withdrawed from → load onto new valve blind flange or production valve from new valve.
2, press the used blanking plug of method of the described replacing main control valve of claim 1, the blanking plug body that comprises flanged fixing head, housing, bearing group and nut sleeve, handwheel seat, screwed pipe and be located at the adjusting screw(rod) of the band packing pressure head in it, packing, release, pressure measurement mechanism, handwheel; It is characterized in that this blanking plug also comprises the transitional fixed mount that contains fixed bar group and holder, fixed head, can be anchored on screw rod the fixedly card on the tubing head; On screwed pipe, also be provided with an annular slot near cup ring part; The two ends of fixed bar group detachably are fastenedly connected with holder and fixed head respectively, and fixedly snap ring shape is stuck in interior then being fastenedly connected by bolt and tubing head port of export flange of draw-in groove on the screwed pipe.
3, by the described blanking plug of claim 2; It is characterized in that described holder is the tubing head body that is provided with two sides flange connecting hole.
4, by the described blanking plug of claim 2; It is characterized in that the fixed bar group is that 3～4 two ends are screw thread, the one end can be connected the straight-bar of screw secure fit with tubing head two sides flange.
5, by the described blanking plug of claim 2; It is characterized in that the opposite opened plate body that described fixedly card is two semi-round ring shapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410022568XA CN1307362C (en) | 2004-05-21 | 2004-05-21 | Method for hot changing master control valve for wellhead device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410022568XA CN1307362C (en) | 2004-05-21 | 2004-05-21 | Method for hot changing master control valve for wellhead device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580483A true CN1580483A (en) | 2005-02-16 |
| CN1307362C CN1307362C (en) | 2007-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410022568XA Expired - Fee Related CN1307362C (en) | 2004-05-21 | 2004-05-21 | Method for hot changing master control valve for wellhead device |
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|---|---|
| CN (1) | CN1307362C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538995B (en) * | 2009-02-27 | 2013-04-03 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for replacing valve by utilizing borehole pressure |
| CN111594088A (en) * | 2020-06-20 | 2020-08-28 | 中国石油天然气股份有限公司 | Injection well head plugging device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2293641Y (en) * | 1997-04-18 | 1998-10-07 | 四川石油管理局川西南矿区 | Inner hole plug for maintaining wellhead device gate valve |
| CN2727382Y (en) * | 2004-05-21 | 2005-09-21 | 四川石油管理局川西钻探公司 | Plug for master control valve pressure replacement for well head assembly |
-
2004
- 2004-05-21 CN CNB200410022568XA patent/CN1307362C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538995B (en) * | 2009-02-27 | 2013-04-03 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for replacing valve by utilizing borehole pressure |
| CN111594088A (en) * | 2020-06-20 | 2020-08-28 | 中国石油天然气股份有限公司 | Injection well head plugging device |
| CN111594088B (en) * | 2020-06-20 | 2022-03-01 | 中国石油天然气股份有限公司 | Injection well head plugging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1307362C (en) | 2007-03-28 |
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| ASS | Succession or assignment of patent right |
Owner name: SICHUAN PETROLEUM ADMINISTRATION CHUANXI DRILLING Free format text: FORMER OWNER: CHUANXINANKUANG DISTRICT, SHIYOUGUANLI BUREAU, SICHUAN PROVINCE Effective date: 20050617 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20050617 Address after: Engineering and Technology Department of West Sichuan Drilling Company, No. 143 Hua Jing Road, Chengdu, Sichuan, Chenghua District, China Applicant after: Sichuan Petroleum Administration Chuanxi Drilling Company Address before: Xiangjiaba, Zigong, Sichuan Applicant before: Zhuanxi Southwest Mining District of Sichuan Petroleum Administration |
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Granted publication date: 20070328 Termination date: 20140521 |