CN2182875Y

CN2182875Y - Device for sealing well with function of leading inner well with out side

Info

Publication number: CN2182875Y
Application number: CN 94205970
Authority: CN
Inventors: 刘星海
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-07
Filing date: 1994-04-07
Publication date: 1994-11-16
Anticipated expiration: 2004-04-07

Abstract

The utility model relates to a device for sealing well with function of leading inner well with out side, belonging to the down-well tool for sealing well in the oil field. The utility model solves the technical problems that oil-bearing formation pollution is easy to be caused because of big mud viscosity on the lower end of the pitshaft when artificial perfuse mud during the process of sealing-well casing and sealing well. The device is composed of two parts of a sealing-well tool and a plug; the sealing-well main body comprises a coupling, a sliding bush, a sealing ring, a pin, a clamp spring and a main body; three mud-circulation holes are evenly distributed in the middle part of the main body, and the center of the plug is provided with a blind hole, and the lower end of the blind hole is tapered. The device is used for sealing well, and the device has the advantages that the device can automatically perfuse mud and can proceed with mud circulation from inside to outside of the annular tube and reduces pollution for the oil layer, etc; in addition, the device is timesaving, labor-saving and object-saving.

Description

Device for sealing well with function of leading inner well with out side

The utility model relates to the downhole tool that a kind of reinforcing oil well is used, and it comprises cementing tool and plug two parts.

At present the downhole tool that uses during reinforcing oil well is a kind of unidirectional block ring, is equivalent to a kind of one way valve, squeezed cement paste during well cementation after, it can stop the backflow of mud, reaches the purpose of well cementation.But it has the following disadvantages:

In the setting of casing process,, accelerate setting of casing speed when 1, cementing the well, need artificial mud, generally descend a bite casing, need in sleeve pipe, irritate four times mud, spend 2-3 hour, consume human and material resources in order to keep the inside and outside pressure balance of sleeve pipe.

The unidirectional block ring that uses when 2, cementing the well, the inside and outside mud of sleeve pipe can not circulate, cause down-hole slurry viscosity excessive, when sleeve pipe during down to desired depth, formation " mud " shape that mud has, and this " mud " shape mud has very high one section outside sleeve pipe, when water squeezing mud in ground is cemented the well, must improve pump pressure, " mud " shape mud bursting that down-hole viscosity is bigger, realize that cement returns height, when improving pump pressure, also most of mud is clamp-oned the oil reservoir of wellbore, easily cause oil layer pollution, damage the stratum, influence oil well output.

Patent Office of the People's Republic of China discloses " from the mud grouting back-pressure valve " in 90 years, application number is: 89213157.8, and notification number is: CN2061206U; Also disclose " the automatic mud grouting block ring of sleeve pipe ", application number is: 88217829.6, and notification number is: CN2051280U.These two kinds of cementing tools have saved the operation of mud grouting, have saved human and material resources, but still can not realize the inside and outside mud circulation of sleeve pipe, make that down-hole slurry viscosity is excessive, easily cause oil layer pollution during well cementation, damage oil reservoir.

The purpose of this utility model is to avoid the weak point in the above-mentioned prior art, and the down-hole cementing unit that provides a kind of reinforcing oil well to use, it can realize automatic mud grouting, and can realize the inside and outside mud circulation of sleeve pipe, guarantee mud viscosity unanimity in the well, reduce oil layer pollution.

The purpose of this utility model can reach by following measure:

It comprises cementing tool and plug two parts, and cementing tool is made up of main body and valve body two big parts, and main element is made up of box cupling, sliding sleeve, sealing ring, pin, jump ring, main body; There is a blind hole at the plug center, and the blind hole lower end is taper.

The purpose of this utility model also can reach by following measure:

Main body has centre bore, and it is connected by pin with sliding sleeve, and there are three circulating openings at the main body middle part, and sliding sleeve has centre bore, and a step is arranged at top, and upper and lower end has sealing ring, and jump ring is arranged bottom.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the structural representation of inside and outside flow type cementing unit.

Fig. 2 is the plug structural representation.

Fig. 3 is the site operation structural representation.

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1: the cementing tool main element is made up of box cupling (1), sliding sleeve (3), sealing ring (2), pin (4), jump ring (5), main body (6); Valve body is made up of one way valve (7), valve ball (8), carriage (9), spring (10), plug (11);

Box cupling (1), main body (6), one way valve (7), plug (11) screw thread link to each other.Sliding sleeve (3) links to each other with pin (4) with main body (6) and locatees, and valve ball (8), carriage (9), spring (10) place in the one way valve (7).

Main body (6) has centre bore, and there is pin hole the upper end, and this hole is relative with the circular trough of sliding sleeve (3), and the middle part is evenly equipped with three circulating openings, and this hole is mud grouting automatically, and can realize the inside and outside mud circulation of sleeve pipe.

Sliding sleeve (3) has a centre bore, and a step is arranged at top, and its upper and lower end has sealing ring (2), between the two seals circle circular trough is arranged, and this groove is relative with the pin hole on main body (6) top, and the jump ring groove is arranged bottom, and jump ring (5) is housed in the groove.

The taper surface that matches with ball is arranged at one way valve (7) top, and the middle part is evenly equipped with three grooves.

Shown in Figure 2: plug is made by rubber (13), is placed with circular steel bushing (12) in the rubber, is used for increasing the compression resistance of plug, and there is blind hole at the center of plug, is taper bottom, does easily to be worn by pressure bottom the time spent when plug is stressed.

As shown in Figure 3: during on-the-spot the use, cementing tool (15) is connected between two sleeve pipes, box cupling (1) upper end links to each other with sleeve pipe (14), one way valve (7) lower end is inserted in the sleeve pipe and is linked to each other with the casing coupling screw thread, both gaps are the annular space (16) that cement paste is flowed through, and sleeve pipe (14) is the most following two sleeve pipes.Sliding sleeve this moment (3) is by pin (4) location, and sliding sleeve (3) can not be subjected to the effect of mud viscous force and upper and lower moving, and sliding sleeve is an opening.During setting of casing, mud can be automatically pours in the sleeve pipe from three circulating openings of main body (6), and after whenever being lowered to the 500m sleeve pipe, but ground is suppressed and carried out mud circulation, thereby upper and lower mud viscosity is constant in the assurance well, avoids the ground overhigh pumping pressure to cause the mud contamination oil reservoir.

After having descended sleeve pipe, in sleeve pipe, put into plug from ground, plug is by the thrust of mud liquid, go downwards to sliding sleeve (3) top, improve pump pressure this moment, pin (4) is cut off, sliding sleeve (3) moves down, the step of sliding sleeve (3) upper end is stuck in the upper surface of main body (6), jump ring (5) discharges the lower surface be stuck in main body (6), sliding sleeve (3) be subjected to power upwards can not on move, sliding sleeve (3) is with three circulating openings sealings of main body (6), sealing ring (2) seals, and avoids cement paste to pour in down a chimney in sleeve pipe from three mud holes of main body (6).When continuing to improve pump pressure, because of plug is taper bottom, the plug blind hole can be pressed and wear, but water squeezing mud well cementation so far, cement paste presses off valve ball (8), three grooves on one way valve (7) to annular space (16) enters in the sleeve pipe of lower end, realizes that by casing shoe back outside of sleeve cement returns height, reaches the purpose of well cementation.After having squeezed cement paste, valve ball (8) is by the central passage of the elastic force leakproof one-way valve (7) of spring (10), with pouring in down a chimney of block water mud.

Compared with the prior art the utility model has the following advantages:

1, in the well cementation setting of casing process, the energy auto-grouting reduces the engineering time, reduces labor strength.

2, this device can be lowered to any degree of depth at sleeve pipe, carries out the circulation of the inside and outside mud of sleeve pipe, keeps the interior upper and lower mud viscosity of pit shaft basic identical, can reduce because of ground infusion hypertonia, and mud is pressed into the oil layer pollution that oil reservoir causes.

3, this device guarantees cementing quality because the effect of sliding sleeve, valve ball can prevent pouring in down a chimney of cement mortar effectively.

4, the utility model is easy for installation, dependable performance.

Claims

1, the inside and outside flow type cementing unit used of a kind of reinforcing oil well, it comprises cementing tool and plug two parts, it is characterized in that: cementing tool is made up of main body and valve body two big parts, and main element is made up of box cupling (1), sliding sleeve (3), sealing ring (2), pin (4), jump ring (5), main body (6); Main body (6) has centre bore, and there is pin hole the upper end, and pin hole is relative with the circular trough of sliding sleeve (3), and main body (6) middle part is evenly equipped with three circulating openings; Sliding sleeve (3) has centre bore, one step is arranged at top, upper and lower end has sealing ring (2), one circular trough is arranged at the top of lower end sealing ring, one jump ring groove is arranged bottom, jump ring (5) is housed in the groove, sliding sleeve (3) links to each other with main body (6) by pin (4) and locatees, there is a blind hole at the plug center, and the blind hole lower end is taper.