CN203626731U

CN203626731U - Low-torque trunnion mounted ball valve for drilling

Info

Publication number: CN203626731U
Application number: CN201320780475.8U
Authority: CN
Inventors: 张微; 李彬; 姚建鹏; 曾艳春; 陆洋阳; 王佳露; 吕楠; 张凤; 齐海鹰
Original assignee: CNPC Great Wall Drilling Co
Current assignee: CNPC Great Wall Drilling Co
Priority date: 2013-11-28
Filing date: 2013-11-28
Publication date: 2014-06-04
Anticipated expiration: 2023-11-28

Abstract

The utility model relates to a safety valve for drilling, in particular to a low-torque trunnion mounted ball valve for drilling. A step in a nipple body of the device is provided with a bearing frame; a lower base is arranged in the lower end of the bearing frame, and is provided with a lower valve seat; the lower end of a spring is butted against the lower base; the upper end of the spring is butted against the lower valve seat; side walls on two sides of the bearing frame are provided with shaft holes for accommodating a sliding bearing; the center of a ball is provided with a channel; two sides of the ball are provided with shaft holes which are aligned with the shaft holes in the side walls on the two sides of the bearing frame, and stationary shafts on the two sides are arranged in the shaft holes; an operational key penetrates through the nipple body and is in concave-convex fit with a stationary shaft on one side; the operational key is connected with an operating handle; the upper end of the bearing frame is provided with an upper base; the lower end of the upper base is provided with an upper valve seat. According to the low-torque trunnion mounted ball valve, the bidirectional seal of upper and lower valve seats is realized, the sealing effect is good, the torque is small, and the valve seats are difficultly deformed and have long service life; the low-torque trunnion mounted ball valve overcomes the defects that the conventional floating ball valve is poor in sealing effect and large in torque and a valve seat is easily deformed.

Description

A kind of low moment of torsion fixing ball valve for drilling well

Technical field:

The utility model relates to a kind of drilling safety valve, particularly low moment of torsion fixing ball valve for a kind of drilling well.

Background technology:

In conventional oil drilling process, for guaranteeing drilling safety, the normal safety valve that uses on drilling tool, safety valve is float ball valve structure, spheroid and valve base chamber seal firmly, spheroid can fluctuate under pressure, lower valve base provides certain precompression by wave spring, but the ball valve ubiquity valve seat under high-pressure situations using is at present yielding, and ball and valve base chamber are easily killed, the problem such as moment of torsion great Yi inefficacy when rotation, has a strong impact on result of use and the downhole safety of ball valve.

Utility model content:

The technical problems to be solved in the utility model is to provide low moment of torsion fixing ball valve for a kind of drilling well, and this device has been realized upper lower valve base two way seal, good sealing effect, and torque is little, and valve seat is not yielding, long service life.Overcome existing float ball valve sealing effectiveness poor, torque is large, the yielding deficiency of valve seat.

Technical solution adopted in the utility model is: low moment of torsion fixing ball valve for a kind of drilling well, comprises spheroid and short circuit body, on short circuit body interior step, bearing support is installed, inside, bearing support lower end is provided with lower bottom base, lower valve base is installed on lower bottom base, spring lower end withstands on lower bottom base, spring upper end withstands on lower valve base, on the sidewall of bearing support both sides, have the axis hole that sliding bearing is installed, ball centre has passage, spheroid both sides are processed with axis hole, axis hole on this axis hole and bearing support both sides sidewall aligns and the fixed axis of both sides is respectively charged into, operated key is concavo-convex cooperation of fixed axis with a side through short circuit body, operated key attended operation handle, base is installed in bearing support upper end, valve seat is installed in upper bed-plate lower end, lower valve base upper end and upper valve base lower end are all by sealing between ball face sealing and spheroid, on the outer wall of bearing support upper end, snap is installed, upper bed-plate upper end is provided with split washer, back-up ring and circlip for hole.

The beneficial effects of the utility model are: the utility model is owing to having adopted the design of fixing spheroid and floating type valve seat, thereby have the effect of upper lower valve base two way seal, good sealing effect, and torque is little, and valve seat is not yielding, long service life.

Accompanying drawing explanation:

Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.

Fig. 1 is structural representation of the present utility model.

The specific embodiment:

As shown in Figure 1, low moment of torsion fixing ball valve for a kind of drilling well, comprises spheroid 6 and short circuit body 12, in short circuit body 12 interior step, bearing support 1 is installed, bearing support 1 inside, lower end is provided with lower bottom base 2, lower valve base 3 is installed on lower bottom base 2, spring 11 lower ends withstand on lower bottom base 2, spring 11 upper ends withstand on lower valve base 3, on bearing support 1 both sides sidewall, have the axis hole that sliding bearing 10 is installed, spheroid 6 centers have passage, spheroid 6 both sides are processed with axis hole, axis hole on this axis hole and bearing support 1 both sides sidewall aligns and the fixed axis of both sides 7 is respectively charged into, operated key 17 is concavo-convex cooperation of fixed axis 7 with a side through short circuit body 12, operated key 17 attended operation handles 16, base 8 is installed in bearing support 1 upper end, valve seat 4 is installed in upper bed-plate 8 lower ends, lower valve base 3 upper ends and upper valve base 4 lower ends are all by sealing between ball face sealing 5 and spheroid 6, on bearing support 1 upper end outer wall, snap 9 is installed, upper bed-plate 8 upper ends are provided with split washer 13, back-up ring 14 and circlip for hole 15.

Spheroid 6 both sides are connected with Y-axis, sliding bearing 10 is housed on axle, when work, the active force that before valve, fluid produces on spheroid 6 all passes to bearing, can not make spheroid 6 move to valve seat, thereby valve seat can not bear excessive pressure, Fixed ball valve, with the valve seat that fluctuates, is subject to after pressure medium, and valve seat produces mobile, valve base sealing position is pressed on spheroid 6, to realize sealing.So the torque of Fixed ball valve is little, valve seat distortion is little, and sealing performance is stable, long service life.

Be understandable that, above about specific descriptions of the present utility model, only for being described, the utility model is not limited to the described technical scheme of the utility model embodiment, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the utility model, to reach identical technique effect; Use needs as long as meet, all within protection domain of the present utility model.

Claims

1. a low moment of torsion fixing ball valve for drilling well, comprises spheroid (6) and short circuit body (12), it is characterized in that: in short circuit body (12) interior step, bearing support (1) is installed, bearing support (1) inside, lower end is provided with lower bottom base (2), the upper lower valve base (3) of installing of lower bottom base (2), spring (11) lower end withstands on lower bottom base (2), spring (11) upper end withstands on lower valve base (3), on the sidewall of bearing support (1) both sides, have the axis hole that sliding bearing (10) are installed, spheroid (6) center has passage, spheroid (6) both sides are processed with axis hole, axis hole on the sidewall of this axis hole and bearing support (1) both sides aligns and the fixed axis of both sides (7) is respectively charged into, operated key (17) is concavo-convex cooperation of fixed axis (7) with a side through short circuit body (12), operated key (17) attended operation handle (16), base (8) is installed in bearing support (1) upper end, valve seat (4) is installed in upper bed-plate (8) lower end, lower valve base (3) upper end and upper valve base (4) lower end are all by sealing between ball face sealing (5) and spheroid (6), on the outer wall of bearing support (1) upper end, snap (9) is installed, upper bed-plate (8) upper end is provided with split washer (13), back-up ring (14) and circlip for hole (15).