CN102454384A

CN102454384A - Three-proofing bypass-valve for screw drill

Info

Publication number: CN102454384A
Application number: CN2010105289518A
Authority: CN
Inventors: 郭大金; 郭峰; 卞文皆; 郭芹; 王�华; 孔庆潭; 高小峰; 欧阳新良
Original assignee: Jiangsu Jinfeng Petroleum Machinery Manufacturing Co Ltd
Current assignee: Jiangsu Jinfeng Petroleum Machinery Manufacturing Co Ltd
Priority date: 2010-10-31
Filing date: 2010-10-31
Publication date: 2012-05-16

Abstract

The invention provides a three-proofing bypass-valve for a screw drill, wherein a backflow-preventing device composed of a valve needle, a spring, a sieve plate and a hole check ring is added in a bypass-valve. The bypass-valve is positioned on the lower part of an inner chamber of a valve body by the sieve plate provided with through holes through the check ring and the arrow-shaped valve needle is arranged on the bypass-valve; the spring is sleeved between a convex table on the lower end of the valve needle and a convex table on the upper end of the sieve plate; the lower side of a valve sleeve is contacted with a vail surface on the valve needle; the place on the valve sleeve, which is provided with a seal ring, is sealed with the lower plane of the valve core. When the mud at the well bottom flows back, the force produced by the bottom compresses the spring to drive the valve needle to be sealed with the vail surface of the valve sleeve so as to effectively prevent impurities like mud from filling the inner chamber of the drilling tool. When the inner side and outer side of the drilling tool are communicated, a bypass port device making use of the same theory seals the hole check ring by the bypass spring to prevent mud from entering the valve body. The three-proofing bypass-valve increases the work efficiency of the drilling tool and lengthens the service cycle. The three-proofing bypass-valve has a simple structure, and is convenient to use, and is suitable to be applied in the oil fields.

Description

A kind of three protection type by-pass valve of screwdrill

Affiliated technical field

The present invention relates to a kind of three protection type by-pass valve of screwdrill, especially the oil field petroleum drilling and mining is used.

Background technology

At present, known common screw drilling tool is formed by four big parts, i.e. by-pass valve assembly, motor assembly, universal drive shaft assembly and driving-shaft assembly.Wherein except by-pass valve assembly can independently use, remaining part must make up and could constitute helicoid hydraulic motor.But the impurity such as sandstone when medium-sized bypass valve can not effectively prevent to pull out of hole in actual use return and are full of the drilling tool inner chamber and cause the serious damage of drilling tool and can not use.

Common bypass valve is made up of parts such as valve body, spool, spring, potted component, screen clothes.Its operating principle is under the situation less than a thribble mud pressure, and spool is under the effect of spring force, and spool is in topmost, and spool is opening, satisfies when making a trip the requirement that exocoel is communicated with in the drill string.When input pressure mud (turn on pump); Produce pressure at valve damping hole place and fall (Δ P1), under the hydraulic piston effect, overcome spring force, frictional force, spool is moved down; Get into sealing station; Bypass valve is closed condition, and the interior exocoel of drill string is opened circuit, thereby is difficult to satisfy the requirement of helicoid hydraulic motor drilling well.

Summary of the invention

The purpose of this invention is to provide a kind of three protection type by-pass valve of screwdrill; Be prone to tell impurity such as causing silt particle and be full of the drilling tool inner chamber with the structure that solves common screw drilling tool bypass valve because of mud flows backwards to return, cause inner chamber to stop up and faults such as stator damage technical problem.

The scheme that the present invention solves this technical problem is:

Install additional in bypass valve inside and to form anti-returning by needle, spring, sieve plate, hole with back-up ring and tell device, improve the by-pass prot device simultaneously and be divided into bypass needle, bypass spring, bypass sieve plate, hole with back-up ring four parts.The sieve plate that is provided with through hole places the bottom of body cavity through back-up ring, is equipped with the flechette-type needle on it, between the boss of needle lower end boss and sieve plate upper end, is equipped with spring; The top of needle heads on valve pocket, and stomidium is processed with the valve face under the valve pocket.When bypass valve was opened, the angle of the valve face of needle and valve pocket sealing was 30 ° or 45 °.Needle contacts with the valve sealing surface of valve pocket, satisfies the requirement that exocoel is communicated with in the drilling tool.When bypass valve cut out, anti-returning told the space that the device inner spring forms by compression and can be passed through mud, satisfies the requirement of creeping into of helicoid hydraulic motor.

The technical problem that this structure mainly solves is:

When the helicoid hydraulic motor use was pinpointed the problems, anti-returning told inner realization of device and the opposite action of brill down, the force compresses spring that the bottom produces; Impel the sealing of needle and valve pocket valve face, spool is opening, and drill string is inside and outside to be communicated with; Preventing effectively that back-pressure official post mud that shaft bottom mud produces from flowing backwards to return tells and often causes impurity such as silt particle to be full of the drilling tool inner chamber, causes part to stop up and fault such as stator damage, and while by-pass prot device also utilizes the identical spring sealed hole of former reason bypass to use back-up ring; Effectively stop mud to get in the valve body, prolong the helicoid hydraulic motor life cycle, guaranteed operating efficiency; And simple in structure, easy to use, be suitable at each elephant and promote.

Description of drawings

Below in conjunction with accompanying drawing and instance the present invention is further specified.

Fig. 1 is the front view of bypass valve of the present invention

Fig. 2 is the sectional view of Fig. 1, is structure by-pass prot setting drawing

1 is valve body among the figure, 2. " O " type circle, and 3. spool, 4. spring, 5. " O " sealing ring, 6. valve pocket, 7. back-up ring is used in the hole, 8. needle, 9. spring, 10. sieve plate, back-up ring is used in 11. holes, 12. bypass needles, 13. bypass springs, 14. bypass sieve plates, back-up ring is used in 15. holes.

The specific embodiment

Below in conjunction with description of drawings, carry out detailed elaboration: Fig. 1 through instance, extraneous slush pump is imported the mud of enough pressure toward bypass valve; Effect through piston falls in the pressure that produces at valve damping hole place, overcomes spring and frictional force, and 3 spools are moved down; Prop up 6 valve pocket tops and enter into sealing station, simultaneously, pressure also impels 8 needles to move down to compress 9 springs; Assurance leaves enough spaces and supplies mud to get into, and turn on pump is accomplished like this, and bypass valve is in the turn on pump state.

When pulling out of hole, mud very easily flows backwards and causes the drill string inner chamber to be full of mud damage drilling tool.As shown in Figure 1, when drilling tool in the short time braked, it is poor that shaft bottom mud produces very big back-pressure; Under the effect of hydraulic impulse; Pressure upwards compresses 9 springs through 11 holes with back-up ring, 10 sieve plates, 8 needles is moved up tightly prop up 6 valve pockets, forms the valve sealing surface.3 spools also are moved upwards up to the bypass valve enable possition simultaneously, and exocoel is communicated with in the drilling tool.

When exocoel was communicated with in Fig. 2, drilling tool, extraneous mud pressure compresses 13 bypass springs through 15 holes with back-up ring, 14 bypass sieve plates to be made it and the sealing of bypass needle, prevents that external mud from getting in the valve body.

Claims

1. three protection type by-pass valve of screwdrill; Anti-blocking anti-the returning of sand control told; Install additional in bypass valve inside and to form anti-returning by needle, spring, sieve plate, hole with back-up ring and tell device, improve the by-pass prot device simultaneously and be divided into bypass needle, bypass spring, bypass sieve plate, hole with back-up ring four parts.

2. by-pass valve of screwdrill according to claim 1 is characterized in that: install additional in bypass valve inside and form anti-returning by needle, spring, sieve plate, hole with back-up ring and tell device.The structure of bypass valve is placed the bottom of body cavity through back-up ring by the sieve plate that is provided with through hole; Be equipped with the flechette-type needle on it; Between the boss of needle lower end boss and sieve plate upper end, be equipped with spring, conflict with the top valve face of needle in the valve pocket below, when bypass valve is opened; The angle of the valve face sealing of needle and valve pocket is 30 ° or 45 °, and the valve pocket top is equipped with the sealing ring place and then seals with the spool lower plane.