CN2767644Y

CN2767644Y - By-pass valve

Info

Publication number: CN2767644Y
Application number: CN 200420061962
Authority: CN
Inventors: 李伟成; 朱明玉; 邹强; 冯明; 刘彬; 周刚
Original assignee: Sichuan Petroleum Administration Bureau
Priority date: 2004-11-09
Filing date: 2004-11-09
Publication date: 2006-03-29
Anticipated expiration: 2014-11-09

Abstract

The utility model relates to a by-pass valve used for building a new circulating passage for drilling tools in petroleum gas drilling. The utility model which belongs to the technical field of drilling device manufacture comprises a valve body and a valve core, wherein the valve core can move downward by differential pressure to open a circulating path for drilling fluid, or a circulating path for drilling fluid can be built by throwing balls. The utility model solves the problem that after a drilling head water hole is blocked, a drilling head position is hard to be approached to open a circulating passage in the prior art. The upper end surface of the valve core is larger than the lower end surface, so that when the drilling head water hole is blocked, the valve core is pushed downward by formed differential pressure and a pin is cut to open and build a circulating passage for drilling fluid. Under normal condition, if the by-pass valve is used for circulation, the valve core can also be pushed downward by throwing balls to open a passage for the by-pass valve.

Description

A kind of bypass valve

Technical field: a kind of bypass valve, be used for when oil and gas well drilling, drilling tool being set up new peripheral passage, belong to the manufacturing technology field of drilling-production equipment.

Prior art: in the process of carrying out oil-gas drilling, reason owing to the stratum, borehole wall may take place stride the situation of collapsing, when this thing happens, the hydrophthalmia of drill bit will be blocked, bit port stops up the circulation that drilling fluid just can not be set up in the back, the drilling in shaft bottom and the thing that collapses also just can not be brought to ground, will cause bit freezing like this, the part drilling tool may be discarded in the down-hole when serious, and cause scrapping of well, and can set up circulation in order to stride when collapsing at the generation borehole wall, take the thing that collapses out of ground, so that alleviate the degree of bit freezing, use at present bypass valve be temporarily to block and to be arranged on the downward passage of drilling fluid in the bypass valve through pitching in drilling rod, form pressure, force existing bypass valve under the drive of pressure, to cut off pin, push spool downwards open, open the circulation canal that is arranged on the valve body, set up circulation; The shortcoming of prior art is: because drilling fluid is a liquid, cannot compress, so after bit port is blocked, if the bypass valve of prior art is contained in the top of close drill bit, promptly or cast ball, also can be too short because of bypass valve bottom distance, and filled mud and can not compress, also just spool can not be pushed to the passage that circulation is opened in the below, therefore, when using prior art, bypass valve can only be contained in more than drill bit hundreds of rice, like this when the generation well collapses, can make the above well section of bypass valve in the well be set up circulation, but can not solve near the problem the drill bit, as deal with improperly, still may cause serious bit freezing incident.

The purpose of this utility model is to open the problem of circulation canal after bit port is blocked at prior art, utilize drilling fluid in bypass valve, can form the principle of pressure reduction, design and a kind ofly can also can utilize the pressure reduction that on spool, forms to open a kind of bypass valve of circulation canal by pitching.

Summary of the invention: the utility model is made of valve body and spool, the position that spool is installed at valve inner has cannelure one, have acclivitous circulation port and the pin hole that ecto-entad connects at the middle part of valve body, spool is that a upper end is big, the cylinder that lower end surface is little, can move down there being under the situation of pressure the pressure reduction of formation promote spool, an inclined-plane is arranged at the top of passage therebetween, so that when needing the situation of pitching, cast ball and block the passage of drilling fluid, the bottom of spool is a cavity, be convenient to the spool that folding and unfolding slips into downwards, at the upper and lower side of spool the sealing ring of twice annular is set respectively, plays the sealing function of spool and valve body.The utility model has the advantages that: since spool to be designed to upper end big, lower end surface is little, therefore, when the situation that bit port stops up takes place, can spool be promoted downwards by the pressure reduction that forms, and cuts off pin and opens the passage of setting up circulation of drilling fluid; Under normal circumstances, circulate through bypass valve if desired, also can push spool to passage that bypass valve is opened in the bottom by pitching.

Marginal data:

Fig. 1 is a cross-sectional view of the present utility model.

Specific embodiments: provide embodiment of the present utility model below in conjunction with accompanying drawing: the utility model is made of valve body 1 and spool 6, in the valve body 1 inner position that spool 6 is installed cannelure 5 is arranged one, the two ends of cannelure 5 do not exceed the two ends of spool 6, have acclivitous circulation port 4 and the pin hole 8 that ecto-entad connects at the middle part of valve body 1, spool 6 is that a upper end is big, the cylinder that lower end surface is little, can move down there being under the situation of pressure the pressure reduction of formation promote spool, the inclined-plane that a circle is arranged in the middle of the upper end of spool 6, so that when needing the situation of pitching, cast ball 2 and block the passage of drilling fluid, the bottom that spool 6 is installed in valve body 1 is a cavity 7, the diameter of cavity 7 is greater than the diameter of spool 6, be convenient to the spool 6 that folding and unfolding slips into downwards, the corresponding position of pin hole is set on spool 6 bottoms and valve body 1 pin hole is also arranged, pin is inserted, at the upper and lower side of spool the sealing ring 3 of twice annular is set respectively, plays the sealing function of spool 6 and valve body 1; During use, this bypass valve is connected on brill top very, when bit port is plugged if collapse or in the kill-job process, because the upper end of spool 6 is big, lower end surface is little, therefore, cast after the steel ball 2, under pump pressure, the pressure reduction that forms on spool 6 upper end will promote spool 6 and move down, and cut off pin 8 and continue to enter downwards in the cavity 7, at this moment circulation port 4 is opened, drilling fluid can form the circulation bypass of drilling fluid by circulation port 4, and the goods and materials that collapse are taken out of outside the well, reaches the purpose of setting up circulation; If under normal circumstances, in the process of logging well, carrying out completion practice, need through bypass valve circulation carrying out kill-job or clean-out service, also can cast steel ball 2, force spool 6 to cut off pin 8 downwards and enter hole capital after selling all securities 7 and open circulation canal 4, set up the circulation of drilling fluid.

Claims

1. bypass valve, comprise valve body and spool, it is characterized in that: the position that spool is installed at described valve inner has cannelure one, the bottom that spool position is installed at valve body is provided with a cavity, have acclivitous circulation port at the middle part of valve body, have the pin hole that an ecto-entad connects at the valve body middle part; The upper end of described spool has the inclined-plane of a circle greater than lower end surface in the middle of the spool upper end, bottom and the corresponding position of valve body pin hole also have a pin hole, respectively are provided with the sealing ring of twice annular at the upper and lower side of spool.

2. a kind of bypass valve according to claim 1 is characterized in that: the two ends of described cannelure do not exceed the two ends of spool; Describedly be arranged on cavity diameter on the spool lower body greater than the diameter of spool.