CN200985772Y - Double-walled well drilling single flow valve - Google Patents

Abstract

The utility model relates to a double walled drilling ball and seat used in drilling operations of oil fields. The utility model is composed of a body pin, an inner tube lower sealing member, a body, an inner tube inferior part, a spring, a distance ring, a piston ring, an inner tube superior part, an inner tube upper sealing member and a body box. The inner tube superior part is in a threaded connection with the inner tube inferior part, the steps of the inner tube superior part firmly lean towards the bevel of the inner surface of the body. The piston ring, the distance ring, and the spring are sleeved on the inner tube superior part and respectively move properly under the action of the spring, the piston ring, under the elasticity of the spring, firmly leans on the steps of the outer surface of the inner tube, the inferior part of the spring leans on the steps of the inner tube inferior part, a screw thread of the ball and seat is connected between double walled drill stems, with the superior part and the inferior part of the double walled drill stems connected with the body box and the body pin respectively. The utility model solves the problem of prior art that as the drill stem gas injection needs a ball and seat, both gas and liquid exist in the drill stem, which is unbeneficial to the application of down hole equipment. The utility model may be widely applied to the drilling operations of oil fields.

Description

A kind of double-walled well drilling ball-and-seat

Technical field:

The utility model relates to a kind of double-walled well drilling ball-and-seat that a kind of oil field petroleum drilling operation is used.

Background technology:

Lasting exploitation along with oil field development, except that numerous main force's block strata pressure deficits is serious, the exploitation in some original low pressure oil fields also is imperative, the air-filling well-drilling technology can effectively be prevented leakage, bit freezing, be prevented oil layer pollution, construction technology is simple, and obtain promoting, but the certain problem that in application, exists, because in the standpipe air-filling well-drilling drilling rod is the gas-liquid two-phase stream mode, make and to use mud motor in the directional well, wired drilling instrument or MWD carry out hole trajectory control, have therefore limited the application of the directional well of air-filling well-drilling technology.The Liaohe Oil Field organizes scientific and technical personnel that the double-wall pipe low-pressure drilling technology in the air-filling well-drilling technology is studied at above-mentioned situation, use a kind of special drilling rod with two passages, utilize central tube normally to pump into mud, inject air and utilize between the annular space of central tube and outer tube, can avoid the gas-liquid mixed state in drill string like this and use ball-and-seat, having designed a drilling assembly is a kind of double-walled well drilling ball-and-seat, has realized realizing at the annular clearance space of double-wall drill pipe the one-way flow of gas.

The utility model content:

The utility model purpose is to provide a kind of double-walled well drilling ball-and-seat, it solved exist in the prior art because of the drilling rod gas injection need be with being the gas-liquid two-phase stream mode in ball-and-seat and the drilling rod, make the problem that can not use mud motor in the directional well.

The technical scheme that its technical problem that solves the utility model adopts is: the air-filling well-drilling technology can solve the drilling problem on pressure stratum in debt, but in the drilling well of directional well, be restricted, therefore, need the double-wall pipe low-pressure drilling technology is studied, develop a kind of drilling rod with two passages, utilize central tube normally to pump into mud, and utilize the annular space of central tube and outer tube to inject air, can avoid the gas-liquid mixed state in drilling well like this to the annular clearance of the drilling rod and the borehole wall.The utility model mainly is the one-way flow that realizes gas at the annular clearance space of double-wall drill pipe, reduces the release time when making up a joint, and reduces the time of the oil consumption and the minimizing secondary cycle of air compressor, has saved cost.A kind of double-walled well drilling ball-and-seat is made up of body pin thread, inner core lower seal body, body, inner core bottom, spring, spacer ring, piston ring, inner core top, inner core top seal body, body box; Inner core top is connected with the inner core lower thread, the step on inner core top abuts against on the inclined-plane of body internal surface, on inner core top with before the inner core bottom is connected, earlier with piston ring, spacer ring and spring housing on inner core top, and along with being connected of inner core top and inner core bottom, put in place under the effect of each comfortable spring, in piston ring abuts against under the elastic force effect of spring on the step of tube outer surface, the spring bottom withstands on the step of inner core bottom, and spring is in the mild compression state; The screwed connection of whole double-walled well drilling ball-and-seat is positioned at full well drilling tool top between double-wall drill pipe, the body box is threaded with top double-wall drill pipe pin thread, and seal and top double-wall drill pipe inner core lower seal body form the plug-in type sealing on the inner core; The box of body pin thread and bottom double-wall drill pipe is threaded, and seal forms the plug-in type sealing on inner core lower seal body and the bottom double-wall drill pipe inner core, thereby forms the individual passage of gas phase and liquid phase.During the work of double-walled well drilling ball-and-seat, the compressed air that injects from the double-wall drill pipe annular gap acts on the piston ring, it is descending that piston ring overcomes the elastic force of spring, and it is descending to drive spacer ring, gas is realized the connection of gas passage by double-wall drill pipe annular gap, the annular gap between inner core and the body to bottom.When stopping gas injection when making up a joint, disappear owing to act on the air pressure at piston ring top, piston ring is returned to original position under the elastic force effect of spring, the gas passage up and down of piston ring is cut off, and the following gas of piston ring is kept in the drilling tool.

The new beneficial effect of this practicality is, simple in structure, utilize this ball-and-seat in drilling process, make the circulatory mediator in the centre bore be in pure liquid phase state, and the full-mesh state of maintenance drill pipe bore, make the mud-pulse signal transmission of MWD and the operate as normal of mud motor, realized the air-filling well-drilling of directional well or horizontal well, removed air-filling well-drilling and be subjected to the uncontrollable restriction with mud motor cisco unity malfunction under the fluffy mud state of well track.

Description of drawings:

Accompanying drawing is the utility model overall structure schematic diagram.

Among the figure, 1, the body pin thread, 2, inner core lower seal body, 3, body, 4, the inner core bottom, 5, spring, 6, spacer ring, 7, piston ring, 8, inner core top, 9, inner core top seal body, 10, the body box.

The specific embodiment:

In the accompanying drawings, a kind of double-walled well drilling ball-and-seat is made up of body pin thread 1, inner core lower seal body 2, body 3, inner core bottom 4, spring 5, spacer ring 6, piston ring 7, inner core top 8, inner core top seal body 9, body box 10; Inner core top 8 is threaded with inner core bottom 4, and the step on inner core top 8 abuts against on the inclined-plane of body 3 inner surfaces; On inner core top 8 with before inner core bottom 4 is connected, earlier piston ring 7, spacer ring 6 and spring 5 are enclosed within on the inner core top 8, and being connected along with inner core top 8 and inner core bottom 4, put in place under the effect of each comfortable spring, in piston ring 7 abuts against under the elastic force effect of spring 5 on the step of tube outer surface, spring 5 bottoms withstand on the step of inner core bottom 4, and spring 5 is in the mild compression state; The screwed connection of whole double-walled well drilling ball-and-seat is positioned at full well drilling tool top between double-wall drill pipe, body box 10 is threaded with top double-wall drill pipe pin thread, and seal 9 and top double-wall drill pipe inner core lower seal body form the plug-in type sealing on the inner core; The box of body pin thread 1 and bottom double-wall drill pipe is threaded, and seal forms the plug-in type sealing on inner core lower seal body 2 and the bottom double-wall drill pipe inner core, thereby forms the individual passage of gas phase and liquid phase.

Claims (1)

1, a kind of double-walled well drilling ball-and-seat is made up of body pin thread (1), inner core lower seal body (2), body (3), inner core bottom (4), spring (5), spacer ring (6), piston ring (7), inner core top (8), inner core top seal body (9), body box (10); It is characterized in that: inner core top (8) are threaded with inner core bottom (4), and the step of inner core top (8) abuts against on the inclined-plane of body (3) inner surface; In inner core top (8) with before inner core bottom (4) are connected, earlier piston ring (7), spacer ring (6) and spring (5) are enclosed within on the inner core top (8), and being connected along with inner core top (8) and inner core bottom (4), put in place under the effect of each comfortable spring, in piston ring (7) abuts against under the elastic force effect of spring (5) on the step of tube outer surface, on the step of pipe bottom (4), spring (5) was in the mild compression state in spring (5) bottom withstood on; The screwed connection of whole double-walled well drilling ball-and-seat is positioned at full well drilling tool top between double-wall drill pipe, body box (10) is threaded with top double-wall drill pipe pin thread, and seal on the inner core (9) and top double-wall drill pipe inner core lower seal body form the plug-in type sealing; The box of body pin thread (1) and bottom double-wall drill pipe is threaded, and seal forms the plug-in type sealing on inner core lower seal body (2) and the bottom double-wall drill pipe inner core, thereby forms the individual passage of gas phase and liquid phase.

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