CN2869304Y

CN2869304Y - Screw drilling tool bypass valve

Info

Publication number: CN2869304Y
Application number: CN 200620007720
Authority: CN
Inventors: 曾礼宾; 郑冲涛; 刘小玮; 羡维伟
Original assignee: China National Petroleum Corp; Sichuan Petroleum Administration Bureau
Current assignee: China National Petroleum Corp; Sichuan Petroleum Administration Bureau
Priority date: 2006-03-10
Filing date: 2006-03-10
Publication date: 2007-02-14
Anticipated expiration: 2016-03-10

Abstract

The utility model relates to a bypass valve of screw drill tool used as an underground combined power drilling tool in oil and gas well, belonging to the manufacturing field of a well drilling device or tool. The utility model is characterized in that the valve core assembly moves backwards to one end of the female connector of the valve body, on which a relief groove and a spacer pin are provided and a spacing shoulder is fixed at the inner diameter; and the position of the spacing shoulder staggers with the position of outer relief groove to solve the problem of strength decrease at the root of the male connecting thread on the vale body cause by stress concentration because the spacing ring groove is manufactured at the root of the male connecting thread on the vale body according to the current technology. The utility model has the advantages that the relief groove staggers with the position of the spacing shoulder to avoid the stress concentration and dangerous cross-section of two points and prevent the male thread from breaking effectively.

Description

A kind of by-pass valve of screwdrill

Technical field:

A kind of by-pass valve of screwdrill is used for belonging to the manufacturing technology field of drilling-production equipment and instrument in oil and gas well drilling engineering and mud motor combination.

Background technology:

At present, when in the drilling engineering of petroleum gas, using the down-hole helicoid hydraulic motor, for the pressure inside and outside the balance drilling tool in the process of boring down, drilling mud in the drilling tool can be flowed in the pit shaft fast and can not take the ground pollution rig floor to, in drilling process, make drilling fluid become the machine power that promotes drill bit, generally in the combination of drilling tool, all have a drilling tool bypass valve, the spool of general drilling tool bypass valve, spring and valve seat and be to put into valve body successively from the first end of the public access of valve body, circlip groove is set on the garden one in valve body, back-up ring is installed, to prevent spool, valve seat is fallen in the well, because the helicoid hydraulic motor that uses carries out well dynamic when creeping into, the weight of helicoid hydraulic motor is very big, and torque is very big when creeping into, so, when using present by-pass valve assembly, have following problem: existing bypass valve valve body male connecting thread root and valve body are not considered the structure that stress is eliminated, and the circlip groove of fixed valve base open with the interior garden of valve body male connecting thread root same position on, therefore cause stress all to concentrate on the root of valve body male connecting thread, the root intensity of valve body male connecting thread is descended, therefore and cause from this position fracture accident and often take place, after the fracture, not only helicoid hydraulic motor falls into the down-hole, and because the back-up ring of valve body has lost effect, the interior spool of valve body assembly that does not have back-up ring, valve seat and spring also drop in the well together, cause the salvaging difficulty of parts.

Summary of the invention

The purpose of this utility model is the shortcoming at prior art, adopts Spool assembly is moved after valve body female joint one end integral body, and takes the setting that eliminates stress, designs a kind of by-pass valve of screwdrill that Spool assembly is packed into successively from bypass valve female joint one end

The utility model is achieved in that the utility model comprises valve body and Spool assembly; Valve body is provided with one escape, a bottom spacer pin and a top spacer pin, valve inner stimulate the menstrual flow for female joint one end big, the first end of public access is little, transition point at female joint and male joint different inner diameters is provided with a spacing half the circumference of the sleeve where it joins the shoulder, escape is arranged on the binding site of valve body public access head end thread tail end and valve body, the position that is provided with of the spacing half the circumference of the sleeve where it joins the shoulder of valve inner is moved behind female joint one end, stagger with the position of outside escape, the interior diameter of valve body is identical with the external diameter of Spool assembly; During use, valve seat is encased in spacing half the circumference of the sleeve where it joins the shoulder from valve body female joint one end, pack into successively then spring and spool, after installing, again bottom spacer pin and top spacer pin are screwed in respectively, valve seat can not be moved, spool can not be withdrawed from from the top of valve body, then by-pass valve of screwdrill has been connected G.I.H just can creep on the drilling tool work.

Of the present utility model a bit and beneficial effect be: the stress that can effectively eliminate valve body and drilling tool tie point root at the escape of the binding site setting of the thread of valve body public access head end and valve body is concentrated, the position that is provided with of the spacing half the circumference of the sleeve where it joins the shoulder of valve inner is moved behind female joint one end and is caused and the staggering of outside escape position, avoided the dangerouse cross-section of public screw thread, can avoid the stress of two points to concentrate, and be provided with on, the lower gear pin is fixed spool effectively, valve seat and spring, even public screw thread root ruptures, drilling tool falls well, the spool of by-pass valve assembly, valve seat can not fallen in the well yet, and the instrument that is easy to is salvaged.

Description of drawings:

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 comprises valve body 1 and Spool assembly, valve body 1 is provided with escape 6 one, a bottom spacer pin 8 and a top spacer pin 11, the internal diameter of valve inner is that female joint one end is big, the first end of public access is little, transition point at female joint and male joint different inner diameters has a spacing half the circumference of the sleeve where it joins the shoulder 7, escape 6 is arranged on the thread of valve body 1 public access head end and the binding site of valve body, the position that is provided with of valve body 1 inner spacing half the circumference of the sleeve where it joins the shoulder 7 is moved behind female joint one end, stagger with the position of outside escape 6, valve body 1 interior diameter is identical with the external diameter of Spool assembly; When needing to use, earlier valve seat 5 is encased in spacing half the circumference of the sleeve where it joins the shoulder 7 from valve body 1 female joint one end, pack into successively then sealing ring 3, spring 4 and spool 2, after installing, valve seat 6 can not be moved bottom spacer pin 8 screw-ins, screw in top spacer pin 11 then on spool 2 tops, spool 2 can not be withdrawed from from the top of valve body 1, then by-pass valve of screwdrill is connected G.I.H on the drilling tool; In the process of boring down, because slush pump does not start, there is not pressure, therefore spool 2 is opened under the effect of spring 4, the drilling mud that enters drilling tool in the well enters annular space by the through hole 9 on spool bore 10 and the valve body 1, play the effect of the inside and outside head of liquid of balance drilling tool, following brill finishes, begin to creep into, after slush pump started, drilling fluid can promote the elastic force that spool 2 overcomes spring 4 downwards, close the spool bore 10 and the through hole 9 that outwards flow, the thrust of drilling fluid is concentrated on the helicoid hydraulic motor, pressure is converted to mechanical rotation energy, drive drill bit and put into; When pulling out of hole, slush pump quits work, and spool 2 upwards, has been opened outside passage under the thrust of spring 4, make the mud stayed in the drilling tool enter annular space and make in the drilling tool that trips out and do not have drilling mud, avoid spilling on the rig floor by the through hole 9 on spool bore 10 and the valve body 1.

Claims

1. by-pass valve of screwdrill, comprise valve body and Spool assembly, it is characterized in that: the thread of public access head end is provided with escape with the binding site of valve body on valve body, and valve body is provided with a bottom spacer pin and a top spacer pin, and a spacing half the circumference of the sleeve where it joins the shoulder is arranged in valve body.

2. a kind of by-pass valve of screwdrill according to claim 1 is characterized in that: stagger in the spacing half the circumference of the sleeve where it joins the shoulder of valve inner and the position of outside escape, and the valve body interior diameter is identical with the external diameter of Spool assembly.