CN202249946U

CN202249946U - Intelligent float valve

Info

Publication number: CN202249946U
Application number: CN2011203053873U
Authority: CN
Inventors: 卫国
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-12
Filing date: 2011-08-12
Publication date: 2012-05-30
Anticipated expiration: 2021-08-12

Abstract

The utility model relates to an intelligent float valve, in particular to a float valve device which is commonly used in a petroleum drilling pipe column, a coal bed gas drilling pipe column, a geothermal drilling pipe column and a hydraulic drilling pipe column. The intelligent float valve consists of limit bolts, a tapered hole rubber plate, a spring, a ball, a valve body, an upper valve seat, a ring-shaped fixing plate and a shell and is characterized in that the valve body is arranged under the upper valve seat that is arranged under the ring-shaped fixing plate in the shell; the ball and the spring are arranged in the valve body; the two ends of the spring are connected with the ball and the valve body; the limit bolts are connected under the valve body; and the tapered hole rubber plate is arranged between the limit bolts. A gap is left between the ball and the upper valve seat. The valve completely adopts the regular size and all components of a common float valve, only a compression spring is replaced by a tension spring, and the limit bolts and the tapered hole rubber plate are additionally arranged, thereby realizing the working condition selecting function and achieving the operation of opening/closing as required and the control according to the flow.

Description

The intelligence 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, underground heat and the water conservancy drilling well tubing string.

Background technology

In the work progress of oil, coal bed gas, underground heat and jetting, in order to prevent the blowout in the tubing string, or problem such as cement paste backflow during well cementation, the valving of adjunction one-way flow in the tubing string of being everlasting, this device is called float valve.At present, the widely used floating valve gear of situ of drilling well has two kinds of basic structures: a kind of is the ball formula, and it is to approach 1g/cm with density ³Material process because the density of mud in most applications greater than 1g/cm ³, because buoyancy function, as long as float valve is immersed in the mud, ball just floats, blocks runner; Another kind is a spring ball formula, and ball is blocked the runner on top by the compression spring jack-up that makes progress.These two kinds of structures all are the one-way flow forms, and mud is only flowing out, and cannot flow into.The empty pipe that in being full of the pit shaft of liquid, is lowered to several kms can cause tubing string and other device compression damage of down-hole, when using above two kinds of conventional float valves, whenever is lowered to the 10-15 endowel mud grouting in the tubing string that will stop, and has 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.Pitching, connect the circulating system, circulate, cut off pin etc. and all need a period of time, if the possibility of blowout is arranged really, incuring loss through delay this short time also is very fatal problem.

Another part patent has proposed to let tubing string reverse the function that certain angle is opened liquid-through hole, realized pouring into automatically mud with respect to float valve, many times, has a lot of centralizer casing strings and does not allow rotation, and its application is restricted.

Its structure of a kind of in addition " the automatic mud grouting float shoe of drillable metal casing " is very simple, and be with unique difference of the spring ball formula float valve of routine: it is in normally open with slips with ball, and after the normal circulation, slips is just ineffective, and ball glides and closes.This a kind of float valve and other supercharging are cut off pin or open jack catchs type the same, can not close immediately running into blowout (mud upwards flows rapidly) time.

Summary of the invention

The purpose of the utility model be to propose a kind of have simultaneously the blowout of preventing with mud grouting automatically, filter mud, avoid the intelligent float valve that mud is excessive, reduce the function that piston action and water attack destroy.The described intelligent float valve of the utility model is made up of limited bolt, bellmouth rubber tile, spring, ball, valve body, upper valve base, annular fixed head and shell; Under the upper valve base under the annular fixed head in the shell valve body is arranged; Ball, spring are arranged in the valve body; Be connected with limited bolt below both ends of the spring in succession ball, the valve body, valve body, the bellmouth rubber tile is arranged between limited bolt.Between ball and the upper valve base space is arranged.The density of ball is identical with residing mud or slightly high, and it is sitting on the tension spring and links together, and the tension force of tension spring is finalized the design according to the volume of ball.Under the normal condition, the gap of 1-99mm is arranged between ball and the upper valve base, the outer mud of pipe just can inflow pipe in, realize automatic mud grouting function.If the excessive velocities in the mud inflow pipe in the pit shaft that is to say that the sign of blowout is arranged, at this moment the high speed slurry flows is being impacted ball, makes it to contact, formed reliable sealing with upper valve base, has realized the prevention mud function of (blowout) of gushing out in manage.Because the gap that ball and upper valve base stay is less, so the kinetic energy of motion is less, add the cushioning effect of tension spring, the impact between ball and the upper valve base is alleviated greatly, the possibility that ball damages reduces.

The bellmouth of device bottom rubber tile enlarges along with the pressure reduction increase, that is to say, after tubing string is transferred to certain depth; Bellmouth just can be opened; Let in the mud injection string, the tubing string lowering velocity is fast more, and bellmouth is opened greatly more; The mud that flow in the pipe is many more, thereby has reduced the piston action of tubing string.When pressure reduction static at tubing string or that tubing string is inside and outside is reduced to certain degree, eyelet will be closed automatically, and the flow in the inflow pipe will stop, thereby keep the liquid level in the pipe to be lower than outside the pipe, guarantee the cleaning of working environment.The diameter of this bellmouth is less in addition, and filtration is arranged, and prevents that bigger solid phase particles from getting in the valve body, results in blockage.

The utility model has been used the basic theory of buoyancy and liquid flow impact force; Utilize whole members of existing float valve, under the condition of former designed appearances and size constancy, improved, increased the operating mode selection function; Thereby realized switch on request; Also can on the size of flow, control simultaneously, thereby make float valve except basic function, also have automatic mud grouting, filter mud, avoid the function that mud is excessive, reduce piston action and water attack destruction with the blowout of preventing.

Description of drawings

The concrete structure of the utility model is made up of legend and case study on implementation.

Accompanying drawing 1 is intelligent float valve structural representation.

Legend: 1, limited bolt, 2, the bellmouth rubber tile, 3, tension spring, 4, ball, 5, valve body,

6, upper valve base, 7, annular fixed head, 8, shell.

The specific embodiment

As shown in the figure, when the normal speed of tubing string (being lower than 4 meter per seconds) is lowered in the pit shaft, ball 4 is sitting on the tension spring 3; The bottom of spring is connected on the valve body 5 and receives its downward pulling force, and ball 4 keeps certain gap to allow the outer mud of tubing string to flow into upper valve base 6, in this case; Bellmouth rubber tile 2 is along with the mud that in pipe, flows is up along limited bolt 1; Covered runner, after tubing string is lowered to certain degree of depth, has managed inside and outside pressure reduction and increase; Manage outer mud and can realize the automatic grouting function through in the eyelet inflow pipe on the bellmouth rubber tile 2.When static or other reason makes the pressure reduction that acts on the bellmouth rubber tile 2 be reduced to certain degree (being generally about 0.2MPa) at tubing string; Eyelet will be closed automatically; Flow in the inflow pipe will stop, thereby keep the liquid level in the pipe to be lower than outside the pipe, guarantee that mud can not overflow to the rig floor face; In fact, this hole increases with pressure reduction and enlarges, and that is to say, the mud faster, that flow in the pipe that tubing string is transferred is many more, has reduced tubing string and has acted on the pit shaft piston action.When mud was fast (greater than 4 meter per seconds) in the inflow pipe, ball 4 was impacted, and contacts with upper valve base 6, closes runner, has prevented the mud backflow.In addition, the diameter in hole is less on the bellmouth rubber tile 2, and filtration is arranged, and prevents that bigger solid phase particles from getting in the valve body, results in blockage.Last a kind of situation, when mud flowed downward, ball 4 had all been shifted onto low level by the mud flow with bellmouth rubber tile 2, and runner opens wide, circulating mud or well cementing operation normally.Annular fixed head 7 is connected with shell 8 with screw thread, it is unloaded pine after, can take out upper valve base 6, according to the ball 4 of the mud density in well installation suitable density.

Claims

1. intelligent float valve is made up of limited bolt, bellmouth rubber tile, spring, ball, 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, spring are arranged in the valve body; Be connected with limited bolt below both ends of the spring in succession ball, the valve body, valve body, the bellmouth rubber tile is arranged between limited bolt.

2. intelligent float valve according to claim 1 is characterized in that: between ball and the upper valve base space is arranged.