CN201953352U

CN201953352U - All-purpose float valve

Info

Publication number: CN201953352U
Application number: CN2010205939140U
Authority: CN
Inventors: 卫国
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-05
Filing date: 2010-11-05
Publication date: 2011-08-31
Anticipated expiration: 2020-11-05

Abstract

The utility model relates to a float valve device which is commonly used in the drilling pipe strings of petroleum, coal seam gas, and underground heat. The all-purpose float valve comprises a ball float, an eye pallet, position-specified bolts, a rubber slab with a conical hole, a valve body, an upper valve seat, a circular fixed plate and a casing, a valve body is arranged below the upper valve seat below the circular fixed plate in the casing, the ball float and the eye pallet are arranged in the valve body, the position-specified bolts are connected at the lower part of the valve body, and the rubber slab with the conical hole are arranged between the position-specified bolts. The float valve can realize the piston effect of blowout proofing, automatic mud grouting, less pipe strings and the function of the throttle valve, furthermore, the float valve provided, simple and reliable in structure, is an ideal float valve device which can reduce string running time, prevent stratum leakage, and maintain a clean work condition.

Description

All-round float valve

Technical field

The utility model relates to the floating valve gear of being used always in a kind of oil, coal bed gas, the geothermal drilling tubing string.

Background technology

In the work progress of oil, coal bed gas, geothermal drilling,, in tubing string, need to have used floating valve gear in order to prevent blowout in the tubing string.At present, situ of drilling well is extensive use of the drilling well floating valve gear two kinds of basic structures, and a kind of is float-ball type, and it is to approach 1g/cm with density ³Material make, and the density of drilling fluid (being commonly called as mud) in most applications greater than 1g/cm ³, therefore, because buoyancy function, as long as float valve is immersed in the mud, ball float just floats, blocks the runner on top; Another kind is the spring hemispheric, and hemisphere is blocked the runner on top by the spring jack-up that makes progress.These two kinds of structures all are the one-way flow forms, that is, mud is only flowing out, and cannot flow into, so that prevented the generation of blowout.But too dark emptying can cause the compression damage of tubing string and other device of down-hole, therefore, when using above two kinds of conventional float valves, whenever is lowered to the mud grouting in the tubing string that will stop behind the 10-15 endowel, like this, just wasted a lot of engineering times.

In order to address this problem, people improve, have invented various " mud grouting devices automatically ", and wherein major part is that supercharging (pitching or add the systemic circulation discharge capacity) is cut off pin or opened jack catchs type.Yet, pitching, connect the circulating system, circulate, cut off pin and need a period of time, strengthen the time that the discharge capacity circulation also needs to connect the circulating system, if the down-hole has the phenomenon of blowout really, incuring loss through delay this short time also is danger close.

Another kind of patent design is to allow tubing string reverse the function of opening the energy liquid-through hole, realizing pouring into automatically mud with respect to float valve.But,, have a lot of centralizer casing strings and do not allow rotation, so its application is restricted many times.

A kind of in addition " the automatic mud grouting float shoe of drillable metal casing " its structure is very simple, is that with unique difference of the spring hemispheric float valve of routine it is in normally open with slips with ball float, and after the normal circulation, slips just is in closed condition with regard to ineffective, ball float.This float valve is cut off pin or opens jack catchs type the same with other supercharging, the well control potential safety hazard is arranged.

Summary of the invention

The purpose of this utility model is to propose a kind ofly to adopt new structure to make it also have automatic mud grouting except that well blowout preventing, prevent to suppress the all-round float valve of the function of splitting earth formation and current limliting under the constant prerequisite of original float valve shell sizes.

The utility model is achieved in that it is made up of ball float, pallet with holes, limited bolt, bellmouth rubber tile, valve body, upper valve base, annular fixed head and shell.It is characterized in that under the upper valve base under the annular fixed head in the shell valve body being arranged, ball float, pallet with holes are arranged in the valve body, valve body lower portion is connected with limited bolt, the bellmouth rubber tile is arranged between limited bolt, the diameter in pallet with holes hole is less than floating ball diameter, quantity is more than 4, and limited bolt quantity is more than 3, and the bellmouth rubber tile vertex of a cone one side is towards the valve body bottom.The density of ball float is bigger than residing mud, so under normal circumstances ball float is sitting on the pallet with holes.Because flowing of the motion of tubing string and mud, the bellmouth rubber tile is along the limited bolt on-off action that moved up and down, and the bellmouth on the bellmouth rubber tile can play metering function, and is excessive to rig floor, the bellmouth rubber tile parts that are absolutely necessary for prevention mud.

The utility model is considered the various operating modes of drillng operation fully, used the basic theory of buoyancy and liquid flow impact force, whole members of existing float valve have been utilized, under the condition of former design outward appearance and size constancy, improve, make float valve except the basic function that can prevent blowout, it has also realized automatic mud grouting, reduces to transfer the piston action in the tubing string process, and, can not cause the mud in the tubing string excessive to the rig floor face.This novel float valve is multiple functional, simple, reliable, is a kind of optimal device for the working environment that shortens the lower tubular column time, prevents to suppress stratum with Louing and keep safety, cleans.

Description of drawings

Concrete structure of the present utility model is made up of legend and case study on implementation.

Accompanying drawing 1 is all-round formula float valve structural representation.

Legend: 1, ball float, 2, pallet with holes, 3, the bellmouth rubber tile, 4, limited bolt, 5, valve body, 6, upper valve base, 7, annular fixed head, 8, shell.

The specific embodiment

As shown in the figure, the upper valve base under the annular fixed head 7 in the shell 8 has valve body 56 times, and ball float 1, pallet with holes 2 are arranged in the valve body 5, and valve body 5 bottoms are connected with limited bolt 4, and bellmouth rubber tile 3 is arranged between limited bolt 4.Under the normal situation, when tubing string to be lowered in the pit shaft less than 2 meter per second constant velocities, the ball float 1 that valve body 5 interior density are 1.5g/cm3 is sitting on the pallet 2 with holes (5 holes), bellmouth rubber tile 3 (thick 2cm) is along with the mud that flows in pipe is up along limited bolt 4 (4) track, covered runner, manage outer mud and whether can continue to flow in the pipe or stop, depending on that whether pressure reduction in the outer and pipe of pipe can press off the bellmouth on the rubber tile, has realized the automatic grouting function.Hole on the bellmouth rubber tile 3 just can be opened under certain pressure, has kept the liquid level in the pipe to be lower than outside the pipe, can guarantee that mud can not overflow to the rig floor face.Simultaneously, this hole increases with pressure reduction and enlarges, and that is to say, more mud flow in the pipe, has reduced piston action.When mud was rapidly (＞4 meter per second) in the inflow pipe, ball float 1 was flushed to upper valve base 6, and the annular fixed heads 7 that upper valve base 6 tops are stuck in the shell 8 are fixing, closed the up runner of mud, had prevented that mud from refluxing or blowout.When mud flowed downward, ball float 1 and bellmouth rubber tile 3 had all been shifted onto low level by mud, opened runner, carried out normal circulation.

Claims

1. all-round float valve, form by ball float, pallet with holes, limited bolt, bellmouth rubber tile, valve body, upper valve base, annular fixed head and shell, it is characterized in that: under the upper valve base under the annular fixed head in the shell valve body is arranged, ball float, pallet with holes are arranged in the valve body, valve body lower portion is connected with limited bolt, and the bellmouth rubber tile is arranged between limited bolt.

2. all-round float valve according to claim 1, it is characterized in that: the diameter in pallet with holes hole is less than floating ball diameter, and quantity is more than 4.

3. all-round float valve according to claim 1, it is characterized in that: limited bolt quantity is more than 3.

4. all-round float valve according to claim 1 is characterized in that: the bellmouth rubber tile vertex of a cone one side is towards the valve body bottom.