CN2035380U - Automatic control inner-tube sealing device - Google Patents

Abstract

The utility model relates to an automatic control inner-tube sealing device which is mainly composed of a sending in joint, a liquid current control tube, a valve sealing sleeve, a suspension pin, a bearing clamping spring of a sealing ring and a nylon ball, used for inner-tube reinforcing well in well drilling for petroleum. Due to a sufficiently big water aperture of the sealing device, a sleeve tube can be sent down without barriers in the work of inner-tube reinforcing well. Due to the automatic locking self-sealing component, the successful rate of the work of inner-tube reinforcing well is very high, under the condition of higher pump pressure. Due to an automatic mud grouting device, artificial mud grouting is not needed when the sleeve tube and a drilling rod are sent down the well; therefore, the utility model can be popularized and applied further in the work of inner-tube reinforcing well with a surface sleeve tube and a sleeve tube of big diameter.

Description

Automatic control inner-tube sealing device

The utility model is a device of controlling liquid stream in the oil drilling in the tubing string well cementing operation automatically, belongs to drilling well downhole tool class.

In the well cementing operation of major diameter sleeve pipes such as oil drilling surface pipe, all adopt insertion to carry out interior tubing string well cementation at present both at home and abroad.Adopt this kind method carry out in tubing string well cementation, need cover tube coupling identical of processing with major diameter surface pipe specification, will insert seat and back pressure valve and be fixed on and overlap in the tube coupling, carry out interior tubing string well cementing operation with the casing string G.I.H then.The weak point of insertion well cementing operation is: parts such as used cover tube coupling, insertion seat are the big heaviness of body not only, and cost is also higher; Because the seat of insertion is arranged, parts such as back pressure valve, the resistance when having increased setting of casing in the sleeve pipe; Because there is not locking device, under the pump pressure condition with higher, insertion tube is easily thrown off the formation short-circuit cycle, causes down-hole accident and tubing string well cementing operation failure in making.

The purpose of this utility model is to propose a kind of automatic locking that has, from movable sealing, and the interior seal of tube device of automatic mud grouting performance, it can overcome the deficiency that the tubing string well cementing operation exists in the insertion effectively and cementing quality is improved.Sealing device not only volume is little, and is in light weight, easy for installation, and cost is low, and the compressive strength height, and drillability can be good.

Now be described with reference to the accompanying drawings implementation procedure of the present utility model.

The utility model is by sending into joint 3, liquid current control base 4, liquid Flow Control tubulation 5, valve sealing shroud 6, hang pin 7, plug 8, " O " RunddichtringO 9,10,14, anti-rotation pin 11, shop bolt 12, pressure bearing and seal ring 13, jump ring 15, nylon ball 16, drawing cover 17 and form.Have enough making of big hydrophthalmia by reflectal LD6, the pressure bearing and seal ring 13 that anti-rotation pin 12 is housed to down-hole gives depthkeeping degree with surface pipe 1 time by screw fit on female box cupling of first surface pipe 1, after treating that sleeve pipe has descended, to send into joint 3, valve sealing shroud 6, liquid Flow Control tubulation 5 by drilling rod 2 and deliver to pressure bearing and seal ring 13 positions, when descending drilling rod, liquid Flow Control tubulation 5 withstands nylon ball 16, and the interior hydrophthalmia of valve sealing shroud 6 is opened, and realizes automatic mud grouting.Pressurize 0.5 ton, jump ring 15 on the valve sealing shroud 6 is clamped in the bottom of pressure bearing and seal ring 13 by the hydrophthalmia of pressure bearing and seal ring 13, " O " RunddichtringO 14 enters duty, and liquid stream can only return the annular space of surface pipe 1 and borehole wall formation from casing shoe through hydrophthalmia in the utility model in the hydrophthalmia of drilling rod 2.The tubing string well cementing operation in the turn on pump circulating mud carries out after 3 tons of pressurizeing, treat that cement paste returns out ground after, stop cementing, the cement pastes in the drilling rod 2 are replaced out with mud or clear water.On carry 5 tons of pulling force, hanging pin 7 is cut off, valve sealing shroud 6 and send into joint 3 and throw off voluntarily, nylon ball 16 stops up the endoporus of valve sealing shroud 6 under the liquid buoyancy effect, form artificial " bridging plug ", the back pressure that the inside and outside fluid pressure differential of control surface pipe 1 is produced, the packing surface pipe liquid between 1 about solidifies cement paste in the annular space of surface pipe 1 and borehole wall formation.After tripping out drilling rod 2, sending into joint 3 and liquid Flow Control tubulation 5, tubing string well cementing operation in finishing.Be retained in component such as the valve sealing shroud 6 of down-hole and pressure bearing and seal ring 13, broken by bit drills when normally creeping into, aluminium bits and copper scale are discharged with circulating mud.

The advantage that the utility model compared with prior art has is: in interior tubing string well cementing operation, make setting of casing unblocked because of enough big hydrophthalmia is arranged; Because of the automatic locking automatic sealing device is arranged, the well cementing operation success rate is very high under the pump pressure condition with higher; Because of being provided with automatic mud grouting device, can be at setting of casing and artificial mud grouting when boring down.

Accompanying drawing is a structural representation of the present utility model.

The utility model is provided by the following examples in conjunction with its schematic diagram:

Sending into joint 3 tops has 410 type joint boxes to link to each other with drilling rod 2, and there is internal thread at its endoporus middle part, and liquid current control base 4 is attached thereto." the liquid Flow Control tubulation 5 made of welded pipe is tightened against on the liquid current control base 4 with 1/2.Send into uniform three wiper blocks in the outside of joint 3, to guarantee to draw cover 17 accurate endoporus by pressure bearing and seal ring 13.The screw that also has two symmetries on the lateral surface of sending into joint 3, the valve sealing shroud of being made by reflectal LD6 6 is close to the bore area of sending into joint 3 by the suspension pin 7 in the screw and is hung.Hanging pin 7 is to be processed into by the basis brass bar, and plug 8 is to design for fixing pin 7.For preventing liquid stream seepage, " O " RunddichtringO 9 is housed also on plug 8.The anti-rotation pin of being processed into by the basis brass bar 11 is installed in a pair of screw of valve sealing shroud 6 bottoms, and on the pressure bearing and seal ring 13 also is to constitute rotation-preventing mechanism jointly in the down-hole by the pin 12 that the basis brass bar is processed into.Have four road closure gasket grooves on the different parts in valve sealing shroud 6 outsides, " O " RunddichtringO 10,14 is placed in one, and forms good sealing with sending into joint 3 and pressure bearing and seal ring 13, prevents liquid stream seepage.Have one cannelure on the Lower Half of valve sealing shroud 6, jump ring 15 is installed in the annular groove, duty lower circlip 15 locking valve sealing shrouds 6 and pressure bearing and seal ring 13.The cover of being processed into by reflectal LD6 17 that draws is tightened against in the bottom screw of valve sealing shroud 6 by screw thread, and nylon ball 16 is placed on its top, in order to forming artificial " bridging plug ".The bottom of valve sealing shroud 6 also has the long slot bore of four symmetries, as fluid course.

Claims (3)

1, seal of tube device in the automatic control type of tubing string well cementing operation in a kind of being used for, mainly by sending into joint 3, liquid current control base 4, liquid Flow Control tubulation 5, valve sealing shroud 6, hang pin 7, anti-rotation pin 11,12, pressure bearing and seal ring 13, O-ring seal 9,10,14, jump ring 15, nylon ball 16, drawing cover 17 forms, it is characterized in that: the top of sending into joint 3 is connected with drilling rod 2, valve sealing shroud 6 is suspended in the endoporus of sending into joint 3 by hanging pin 7, liquid Flow Control tubulation 5 by liquid current control base 4 with send into joint 3 and be connected, pressure bearing and seal ring 13 is by on the female box cupling that is threaded in surface pipe 1, in the long slot bore of four symmetries of valve sealing shroud 6 bottoms, be placed on nylon ball 16, draw cover 17 is tightened against valve sealing shroud 6 by screw thread bottom.

2, seal of tube device in the automatic control type according to claim 1, it is characterized in that valve sealing shroud 6, pressure bearing and seal ring 13, drawing cover 17 is to be processed into by good reflectal LD6 by drillability.

3, seal of tube device in the automatic control type according to claim 1, it is characterized in that hanging pin 7 is to be processed into by the basis brass bar.