CN2132829Y

CN2132829Y - Differential pressure staged cementing unit

Info

Publication number: CN2132829Y
Application number: CN 92211598
Authority: CN
Inventors: 何源远; 李详; 朱成君; 李玉海
Original assignee: Well Cementation Co Drilling C
Current assignee: Well Cementation Co Drilling C
Priority date: 1992-04-10
Filing date: 1992-04-10
Publication date: 1993-05-12
Anticipated expiration: 2002-04-10

Abstract

The utility model discloses a staged cementing unit for drilling oil well. A traditional procedure that a blocking sitting seal is opened by casting and a circulation port is opened by bit pressure is cancelled, and the bit pressure is directly adopted to open the circulation port. Besides that the utility model can be used for the staged cementing operation of vertical shaft, directional well, horizontal well, etc., the utility model can also be cooperated with underground tools such as an external pipe packer, a cement umbrella, etc., to solve various especial cementing technology needs, comprising components of a main body, a casing, an open sheath, a closing sheath, etc. The part sheathed between the main body and the casing is opened, the bit pressure in the tube can make the opening sheath displaced, with the circulation port exposed, and the staged cementing operation can be carried out.

Description

Differential pressure staged cementing unit

The utility model relates to a kind of oil drilling hook-up for cementing, particularly a kind of differential stage cementing device.

At present, the on-the-spot stage cementing device that uses to open cover be to be contained in the main body inner chamber, the process of in use opening circulation port is opened to fill in by throwings and is set the pressure of spraining after the free-falling and open.Because opening plug can not free-falling in high angle hole section especially net horizontal section, and the pipe internal channel has been closed and can not have been used pumping, so can't use in high-inclination directional well and horizontal well.In addition, need the time owing to open the plug free-falling, generally need 30 minutes to 1 hour, if at this moment the outer cement paste of pipe returns to stage cementing device, with regard to might because cement paste static a period of time and form bridge blinding, circulation port sprained not open and cause second level cementing job failure.Use this series products working procedure not compact, time-consuming, easily form the bridge blinding pump of spraining.

The purpose of this utility model is to provide a kind of scope of application wide, saves labor, and can overcome the differential stage cementing device of bridge blinding.

Technical solution of the present utility model is finished as follows: adopt the pressure of spraining in the pipe to open under the method cancellation of circulation port and open this procedure of plug, enlarge range of application.For this reason, the utility model is that main body and shell are opened several circulation ports on same cross section, opens inlet opening in the bottom of main body, will open to be set between main body and the shell, on the inlet opening, to cover in circulation port.Close the top that is set in main body inner chamber circulation port.With pin will open the cover and close the cover be fixed on the initial position.After first order cementing, then continue to sprain to press for the mud bruising and cut off pin, to open to put and move, circulation port is opened, and can carry out second level cementing job.Operation finishes, and the throwing plug sets to sprain to press to make to close to overlap to move down closes circulation port.

The utility model is compared with existing stage cementing device and is had the following advantages:

1, the utility model is opened circulation port with that and is carried out second level operation after first order cementing bruising, has removed and has thrown the operation of opening plug, makes operation compactness, simplification, saving of work and time.

2, save the waiting time of opening the plug free-falling, avoided the outer unnecessary cement paste of pipe because of static a period of time cause bridge blinding, the danger of the pump of spraining.

3, applied range, straight well, directional well and horizontal well all are suitable for.Decapacitation is used for multistage cementing and makes downhole tools such as out of trade, all right fit tube external packer, basket, solves the needs of various special well shaft fixing technologies.

Below with reference to accompanying drawing the utility model is done further detailed description.

Fig. 1 is a constructional drawing of the present utility model.

Fig. 2 is the view after the utility model construction.

Number in the figure is represented:

The 1-main body, the 2-shell, 3-closes cover, the 4-pin, the 5-pin, the 6-circulation port, 7-opens cover, 8-inlet opening, 9-anti-rotation baffle plate, 10-bruising ring, 11-self-locking mechanism, 12-self-locking mechanism.

Accompanying drawing discloses entire infrastructure of the present utility model. Referring to Fig. 1, open cover (7) and be loaded between main body (1) and the shell (2), close the inner chamber that cover (3) is loaded on main body (1). Main body (1) and shell (2) correspondence on same cross section have several circulation ports (6), also have inlet opening (8) on the main body (1). Open cover (7) and be fixed on the inlet opening (8) with pin (4), shelter from circulation port (6), close cover (3) and then use pin (5) to be fixed in circulation port (6) top. Bruising ring (10) is equipped with in the upper surface of closing cover (3), and the lower surface has gear tooth and the gear tooth of the anti-rotation baffle plate (9) that is contained in main body (1) bottom to mesh. Interior chamfering is arranged at the internal diameter top of bruising ring (10).

With the two stage cementing operation is example, the utility model is connected on goes into the well on the casing string to a certain degree of depth cementing, after first order cement is annotated in circulation, for the mud bruising.At this moment, because the effect of inlet opening (8), make and open cover (7) the two ends pressure difference of bearing up and down, when pressure reduction reached 11-13MPa, pin (4) was cut off, and opened on the cover (7) and moved, and exposed circulation port (6), can carry out second level cementing job.After the cementing of the second level, throw plug and set on the bruising ring (10) of closing cover (3) upper end for mud, the pressure of spraining is cut off pin (5), closes cover (3) and moves down a circulation port (6) and close (see figure 2), and construction finishes.Open cover (7) and close cover (3) move after respectively by self-locking mechanism (11) and (12) permanent pinning.Self-locking mechanism (11) and (12) are made up of spring and lock pin, and spring is in the lining, and lock pin is loaded in the pin-and-hole outside, meet groove and eject, and play locking action.The sealing of each members of the utility model, joining place guarantees with joint ring.The well cementation back bores plug and bruising ring (10) down.The anti-rotation baffle plate (9) of dress aims at and bores plug and bruising ring (10) and design in the main body (1), and the retaining tooth above it is meshed with the retaining tooth of closing cover (3) lower end, and prevention plug and the drilled headband of bruising ring (10) rotation.

Claims

1, a kind of oil drilling stage cementing device, have main body (1), shell (2), open cover (7), close cover (3) and anti-rotation baffle plate (9), it is characterized in that opening cover (7) and be loaded between main body (1) and the shell (2), close cover (3) and be contained in the inner chamber of main body (1).

2, stage cementing device according to claim 1, it is characterized in that main body (1) and shell (2) correspondence on same cross section have several circulation ports (6), main body (1) also has inlet opening (8), close cover (3) and open cover (7) and be individually fixed on circulation port (6) and the inlet opening (8), sprain in the pipe to press to make and open cover (7) displacement and close circulation port (6), after injecting cement, throw plug and sprain to press to make and close cover (3) displacement and close circulation port (6).

3, stage cementing device according to claim 1 is characterized in that anti-rotation baffle plate (9) is loaded on main body (1) inner chamber bottom, has the retaining tooth to be meshed with the retaining tooth of closing cover (3) lower end on it.

4, stage cementing device according to claim 1 is characterized in that closing cover (3) upper surface bruising ring (10) is housed, and interior chamfering is arranged at its internal diameter top.

5, stage cementing device according to claim 1, it is characterized in that opening cover (7) and close and be respectively equipped with pin (4), (5) and self-locking mechanism (11), (12) on the cover (3), self-locking mechanism (11) and (12) are made up of spring and lock pin, be loaded in the pin-and-hole, spring is in the lining, and lock pin outside.

6, stage cementing device according to claim 1 is characterized in that the connection of each parts, joining place seal with sealing ring.