CN201024976Y - An automatic close hydraulic pressure hierarchical concrete injection well fixing device - Google Patents

Abstract

The utility model relates to an automatic closing hydraulic leveled well fixing device with the affused mud, consisting of a jointing hoop, a body, a liquid cylinder, a fixing pin, a sealing ring, a piston, a sealing loop, a cutting pin, a spring and a fixing sleeve. The upper part of the body is connected with the jointing hoop through a screw thread, and the body is coated with the liquid cylinder, with the body and the liquid cylinder connected and fixed with each other through a fixing pin. A sealing groove on the upper part of the inner side of the liquid cylinder has the sealing ring. The ring-shaped cavity between the body and the liquid cylinder is provided with the piston, and the sealing groove outside of the ring-shaped cavity is provided with the sealing loop, with the piston fixed with the body through the cutting pin. The lower part of the liquid cylinder is internally provided with the spring, the lower part of which is fixed with the fixing sleeve in a compression and adjustment manner, with the fixing sleeve also connected with a screw thread. The well fixing device is reasonable in design, simple in structure, convenient in use and reliable in work, can guarantee the hydraulic circulation, the well wash, the smooth replacement of the mud by the affused mud, the automatic closing of the spring force, the one-time leveling of the affused mud, greatly improves the quality of the well fixation and reduces the time in digging and blocking, the well digging period and the production cost.

Description

A kind of fluid pressure type stage cementing cementing unit of closing automatically

Technical field:

The utility model relates to a kind of downhole tool that is used for the particularly long envelope section of oil drilling, big gradient, sidetracked hole and the compound completion cementing well of horizontal well, belongs to oil drilling completion tool class.

Background technology:

In oil drilling completion process, on-the-spot mechanical type or the fluid pressure type stage cementing device of adopting usually at present carries out stage cementing.The former builds the pressure by throwing gravity plug to open, the latter leans against the pressure that directly builds the pressure in the sleeve pipe and increase to open, but both close all and promote to close descending realization of cover by plug under the fluid power effect, the back of waiting then to the cement solidifies uses drill bit with plug and close the built-in plug support trepan of cover and fall, reach and sleeve pipe with the footpath.Like this, bore plug and close the cement sheath damage that the built-in plug retainer ring of cover will be managed outer sealing easily, influence sealing quality and sealing, and prolong drilling period, increase operating cost.

The utility model content:

The purpose of this utility model is to provide a kind of can improve the sealing quality, reduce the well cementing operation operation, shorten drilling period, reduce cost close fluid pressure type stage cementing cementing unit automatically.

The utility model is to realize like this.This kind cementing well device is made up of box cupling, body, fluid cylinder, steady pin, sealing ring, piston, joint ring, shear pin, spring, fixed cover, the body upper end is connected with box cupling with screw thread, the body outside is set with fluid cylinder, the two is connected and fixed with steady pin, is provided with sealing ring in the fluid cylinder upper inner seal groove; Be provided with piston in the annular space between body and the fluid cylinder, be provided with joint ring in its outside seal groove, piston and this body and function shear pin are fixed; Fluid cylinder bottom built-in spring, the lower end is by fixing with the fixed cover compression adjustment that screw thread is connected with body.During well cementing operation, after this device arrives predetermined well depth down with sleeve pipe, give in the body and suppress the promotion piston; Shear pin is cut off when being pressurized to certain pressure, and piston promotes spring and moves down the liquid-through hole that exposes on the fluid cylinder, and pipe is inside and outside to be communicated with, and can carry out circulation well cleanup, cementing and replacement mud; After finishing the termination of pumping of cementing well operation, piston automatically resets under the effect than high cement slurry pressure reduction outside spring force and pipe and closes, and finishes the cementing operation operation, treats that cement paste solidifies, and piston seals permanent fixation.

The utility model is reasonable in design, simple in structure, easy to use, reliable operation utilizes it can guarantee that hydraulic pressure circulation, well-flushing, cementing, replacement mud carry out closing automatically with spring force smoothly, guarantees once success of stage cementing, improve cementing quality greatly, reduce and bore the plug time, shorten drilling period, reduce production costs.

Description of drawings:

Fig. 1 is a general structure schematic diagram of the present utility model.Fig. 2 is its another kind of structural representation.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in the figure, the utility model is made up of box cupling 1, body 2, fluid cylinder 3, steady pin 4, sealing ring 5, piston 7, joint ring 8, shear pin 10, spring 11, fixed cover 12, its assembling annexation is as follows: body 2 upper ends are connected with box cupling 1 with screw thread, body 2 outsides are set with fluid cylinder 3, the two is connected and fixed with steady pin 4, in the fluid cylinder 3 upper inner seal grooves sealing ring 5 is arranged; Be provided with piston 7 in the annular space between body 2 and the fluid cylinder 3, be provided with joint ring 8 in its outside seal groove, piston 7 is fixing with body 2 usefulness shear pins 10; Fluid cylinder 3 bottom built-in springs 11, the lower end is by fixing with fixed cover 12 compression adjustment that screw thread is connected with body.Among Fig. 2, the utility model general structure and parts and Fig. 1 are basic identical, and the two difference is that fluid cylinder 3 length that adopted are lacked (having only the first half), and spring 11 is naked state, and piston 7 bottoms are provided with step.Wherein, body 2 is a pipe body, its upper and lower end is respectively equipped with the pin thread that the band tapering has self seal, upper portion side wall is provided with and is used for the inside and outside circulation port 6 that is communicated with, fluid cylinder 3 tops are provided with fixed pin holes, inner headed face is provided with step and piston 7 matches, and middle part and lower sides are respectively equipped with liquid-through hole 9.The inside and outside disc in piston 7 tops is provided with seal groove, and middle part or bottom are provided with shear pinhole.

Claims (1)

1. close fluid pressure type stage cementing cementing unit automatically for one kind, form by box cupling (1), body (2), fluid cylinder (3), steady pin (4), sealing ring (5), piston (7), joint ring (8), shear pin (10), spring (11), fixed cover (12), it is characterized in that: body (2) upper end is connected with box cupling (1) with screw thread, body (2) outside is set with fluid cylinder (3), the two is connected and fixed with steady pin (4), in fluid cylinder (3) the upper inner seal groove sealing ring (5) is arranged; Be provided with piston (7) in the annular space between body (2) and the fluid cylinder (3), be provided with joint ring (8) in its outside seal groove, piston (7) is fixing with shear pin (10) with body (2); Fluid cylinder (3) bottom built-in spring (11), the lower end is by fixing with fixed cover (12) compression adjustment that body is connected with screw thread.

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