CN2727382Y

CN2727382Y - Plug for master control valve pressure replacement for well head assembly

Info

Publication number: CN2727382Y
Application number: CN 200420033636
Authority: CN
Inventors: 杨国均; 马贵荣; 余超; 杨俊文; 李映强; 梁尚仁; 徐英
Original assignee: Sichuan Petroleum Administration Chuanxi Drilling Co
Current assignee: Sichuan Petroleum Administration Chuanxi Drilling Co; Sichuan Petroleum Administration Bureau
Priority date: 2004-05-21
Filing date: 2004-05-21
Publication date: 2005-09-21
Anticipated expiration: 2014-05-21

Abstract

The utility model belongs to a plug device for master control valve pressure replacement for an oil or gas extraction wellhead device, which comprises a belt fixed head, a housing body, a bearing and a nut sleeve arranged in the housing body, a plug device main body of a hand wheel base, a screw pipe, a neck, a pressure testing and relief mechanism, a transitional fixing rack which comprises a fixed rod group, a fixed base and a fixed plate of the fixed rod and is fixedly connected with an oil pipe head in a removable type, a fixed clamp which can be arranged in the neck to connect the screw pipe with an outlet end flange of the oil pipe head for disassembling the master control valve, a cup ring adjusting rod and a cup ring. The utility model has the characteristics of convenient operation for valve replacement, safety, reliability, a wide application range, capability of construction under any pressure state, short construction time, low cost, no well killing downtime, no block for formation pores, etc., and overcomes the shortages of well killing downtime which leads to the block for the formation pores, or poor safety, difficult operation and use only for low pressure wellhead devices, or only partial maintenance for the master control valve and impossibility of valves change, etc. of background technique.

Description

Wellhead assembly replace with pressure main control valve blanking plug

Technical field

The utility model belongs to oil (gas) field oil recovery (gas) wellhead assembly and changes the used blanking plug of its main control valve in working order down.Be particluarly suitable under the high pressure conditions its main control valve being changed; Also can be used in the parallel port device 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.Though this blanking plug and obstruction method have the kill-job of not needing, stop production and 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 purpose of this utility model is the defective that exists at background technology, improve a kind of wellhead assembly replace with pressure main control valve blanking plug 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 utility model 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 utility model 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 utility model 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 thereby overcome background technology or need 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.

Description of drawings

Fig. 1 is the utility model plug structure schematic diagram;

Fig. 2 is that the utility model blanking plug body is connected with main control valve and the block part schematic diagram.

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.

The specific embodiment

Present embodiment is example with the model for the KQ70 wellhead assembly changes the main control valve blanking plug:

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 in changing the valve operation:

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;

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 and produce valve and can use.

Claims

1, a kind of wellhead assembly replace with pressure main control valve blanking plug, 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.

2, by the described blanking plug of claim 1; It is characterized in that described holder is the tubing head body that is provided with two sides flange connecting hole.

3, 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.

4, 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.