CN101260788A

CN101260788A - Superdeep well great displacement high performance boring tool protector for well

Info

Publication number: CN101260788A
Application number: CNA2008100442660A
Authority: CN
Inventors: 祝效华; 贾彦杰; 童华
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2008-04-18
Filing date: 2008-04-18
Publication date: 2008-09-10
Anticipated expiration: 2028-04-18
Also published as: CN101260788B

Abstract

The invention relates to a high performance driller protector which is used for a mud medium ultra deep well and an ultra deep well extended reach well with strong vibration, high friction and high possibility of failure. The driller protector has the functions of lubricating strongly, centralizing, reducing friction and resistance, releasing the bushing camber wear, preventing a key slot from clamping and the driller and protecting a connector. The technical proposal is as follows: a coupling housing is arranged at a centralizer connector body, the outside surface is provided with a medium flow passage and a tapered pressure groove which are uniformly distributed on the coupling housing in a spaced way; the inner part is provided with a pair of rolling bearings directly interference arranged on the connector body; the rolling bearings and the sleeve as well as the self-lubricating obturating ring set are respectively arranged on the inner surface of the two ends of the coupling housing symmetrically; and a middle filling cavity of the two rolling bearings and a top filling cavity between the bearings and the connector body are filled with graphite. The driller protector has strong ability to decrease vibration and to release the abrasion of the drill pipe and the bushing, reduces the torque, increases the drilling ability, has a simple structure and low cost, and is used for drilling in an oil-gas field.

Description

A kind of Superdeep well great displacement high performance boring tool protector for well

Technical field

The present invention relates to a kind of mud medium deep-well ultradeep well that is used for, have high vibration, high frictional resistance, drill collar and the lower curved section of bottom drilling rod and extended reach well and the Superdeep well great displacement high performance boring tool protector for well of horizontal segment of drilling tool failure easily takes place.

Background technology

The development of deep-well ultradeep well drilling technology is based on modern drilling technology, and the technical difficult points that faces has: HTHP, multiple pressure power system, structure, bad ground etc. in front of the mountains.China's deep-well ultradeep well starting is late, but development in recent years is rapid, and having formed one is the main and selectable road that advanced foreign technology combines that absorbs with the independent research, and through effort for many years, competitiveness in the international market has obtained progressively improving.But along with the exploitation of western oil field, the Failure count of deep-well and ultradeep well drill string is still high.Discovering that by analysis fatigue is the main failure forms of drill string, account for 70% of total failure number, mainly is mechanical oscillation and corrosion and directly impel failure reasons.

The extended reach well technology is the development along with measuring technique, geologic steering drilling technology, closed loop drilling technology, becomes the most important means of sea, exploitation beach and offshore oil and gas resource substantially.At present, the external extended reach well that has been drilled to the super myriametre of horizontal movement, and domestic dependence self strength can only be finished the extended reach well of the about 4000m of horizontal movement, and the frictional resistance torsion problem of tubing string is one of key problem that influences the extended reach well technology, and the maximum of its decision horizontal movement is extended.In the practice, because the frictional resistance moment of torsion of tubing string is too big, following situation may occur at the scene: drilling tool rises to come up or the drillling tool twisting off accident takes place; The casing string combination can not be lowered to suitable layer position, can not realize completion smoothly.

Effectively reducing drill string frictional resistance moment of torsion, is the key of guaranteeing deep-well, ultradeep well and extended reach well drilling well success.Therefore, designed a kind of Superdeep well great displacement high performance boring tool protector for well, this instrument bases oneself upon the mechanics of materials, ballistics and hydrodynamics, by appropriate design, can effectively absorb drilling tool side knock and vibration, reduces torsional resistance; Simultaneously effectively utilize hydraulic energy to set upright drilling tool placed in the middle, avoid key-seating sticking and heavy bits bit freezing, significantly alleviate eccentric wear in the sleeve pipe.

Summary of the invention

The objective of the invention is: for provide a kind of have by force lubricate, set upright, resistance falls in antifriction, alleviate the sleeve pipe eccentric wear, prevention key-seating sticking protection joint, proposes a kind of Superdeep well great displacement high performance boring tool protector for well especially.

In order to achieve the above object; the present invention solves the technical scheme that this technical problem adopts: a kind of Superdeep well great displacement high performance boring tool protector for well, form by top connection body 1, self-lubricating sealing ring group 2, sleeve 3, vibration isolation rubber cover 4, rolling bearing 5, box cupling shell 6, lower contact body 7.Its architectural feature is: box cupling shell 6 is installed in

centralizer sub body

1,7 places, and its external surface has medium runner 11 and wedge shape head tank 10, uniformly at intervals on box cupling shell 6; A pair of rolling bearing 5 is equipped with in its inside, be installed on upper and

lower joint body

1 and 7 to rolling bearing 5 direct interference, perhaps blowing or assembling one deck vibration isolation rubber cover 4 on inner surface rolling bearing 5 installation positions of box cupling shell 6, itself and rolling bearing 5 are wide or short slightly, thickness 5 ~ 8mm; Rolling bearing 5, sleeve 3 and self-lubricating sealing ring group 2 be the inner surface that is installed in box cupling shell 6 two ends of symmetry respectively, by shaft shoulder location in the box cupling shell 6; Self-lubricating sealing ring group 2 contacts with joint body, and the middle part that forms between two rolling bearings 5 is filled top between chamber 8 and bearing and the joint body and filled and fill graphite in the chamber 9.Self-lubricating sealing ring group 2 places joint body and box cupling shell 6 places, and each group has 2 ~ 3 layers of self-lubricating sealing graphite circle to form, and sleeve 3 location are arranged between rolling bearing 5 and the self-lubricating sealing ring group 2.On the ridge between wedge shape head tank 10 and the medium runner 11 cast or rolling one deck friction factor is lower, the abrasionproof effect better and the higher carbide alloy of side direction supporting capacity, its carbide alloy is a kind of of W-Co kind, tungsten titanium cobalt class, tungsten titanium cobalt tantalum class.

The beneficial effect that the present invention has is: (1) the present invention is simple in structure, can effectively utilize fluid dynamic, the wedge shape head tank makes the box cupling shell position annular space area change that contacts with the borehole wall, and fluid pressure raises at the wedge-shaped slot middle part, promotes drilling tool and moves to the well center.This structure has strengthened the lubricant effect of drilling tool and borehole wall contact site, can effectively reduce friction and prevention sleeve pipe eccentric wear; (2) have the effect of vibration damping absorbing, the collision that can slow down the drilling tool and the borehole wall improves lower drilling tool safety of structure and drilling ability; (3) have self-lubricating and sealing function; (4) tool surfaces cast or the little carbide alloy of rolling friction coefficient can effectively reduce the wearing and tearing to sleeve pipe, have reduced the loss of machine of torque that drill string transmits.

Description of drawings

Fig. 1 is the structural representation of a kind of Superdeep well great displacement high performance boring tool protector for well of the present invention.

Fig. 2 is the another kind of structural representation of a kind of Superdeep well great displacement high performance boring tool protector for well of the present invention.

Fig. 3 is a kind of Superdeep well great displacement high performance boring tool protector for well box cupling of the present invention shell medium runner and wedge shape pressure concentrated flow road structural representation.

Among the figure: 1. top connection body, 2. self-lubricating sealing ring group, 3. sleeve, 4. vibration isolation rubber cover, 5. rolling bearing, 6. box cupling shell, 7. lower contact body, 8. graphite-filled chamber, middle part, 9. graphite-filled chamber, end, 10. wedge shape head tank, 11. medium runners.

The specific embodiment

According to Fig. 1, shown in Figure 3, box cupling shell 6 is installed at

centralizer body joint

1,7 places, a pair of rolling bearing 5 is equipped with in box cupling shell 6 inside, box cupling shell 6 its external surfaces have medium runner 11 and wedge shape head tank 10, blowing or assembling one deck vibration isolation rubber cover 4 on its inner surface rolling bearing 5 installation positions, the vibration isolation rubber cover has the effect of vibration damping absorbing, can slow down the impact strength of the drilling tool and the borehole wall, improves lower drilling tool safety of structure and drilling ability; Self-lubricating sealing ring group 2 places joint and box cupling shell place, and each group has 2 ~ 3 pairs of self-lubricating sealing graphite circles to form respectively, and self-lubricating sealing ring group had both played lubricated and sealing function, also played the axial location effect, reduced the friction between box cupling shell and the body; Sleeve 3 location are arranged between rolling bearing 5 and the self-lubricating sealing ring group 2.

Box cupling shell 6 its external surfaces have medium runner 11 and wedge shape head tank 10, when drilling tool contacts with the borehole wall, the annular space flow area of contact area axially upwards diminishes along well gradually because of the contraction of wedge shape, and local pressure raises, and promotes drilling tool and leaves contact surface back well middle part.Medium runner 11 and wedge shape head tank 10 are uniformly at intervals on box cupling shell 6, can guarantee no matter the box cupling shell contacts in all directions with the borehole wall, all play and strengthen lubricated, fluid power vibration damping (horizontal stroke), reduce the frictional resistance moment of torsion, slow down the sleeve pipe eccentric wear, the effect of prevention key-seating sticking.

Cast or rolling one deck friction factor are lower on the ridge between wedge shape head tank 10 and the medium runner 11, and the better and higher carbide alloy of side direction supporting capacity of abrasionproof effect is effectively alleviated the wearing and tearing of the borehole wall, have reduced the loss of machine of torque that drill string transmits.

This structure mainly is applicable in the deep-well ultradeep well position that drilling tool failure easily takes place, can reduce drilling tool the coefficient of friction resistance, slow down vibration, reduce loss of machine of torque, improve mud drilling drilling tool service behaviour and job security.

According to Fig. 2, shown in Figure 3, a pair of rolling bearing 5 is equipped with in box cupling shell 6 inside, the drilling tool of lower curved section and horizontal segment directly connects down the borehole wall usually in the extended reach well, and rotating speed is not too high, horizontal amplitude is less relatively, can not use the vibration isolation rubber cover this moment, and rolling bearing 5 directly is installed on

joint body

1 and 7 to interference.Other structures as shown in Figure 1.

This structure is mainly used in extended reach well, can effectively strengthen the lubricant effect between the drilling tool and the borehole wall, reduces frictional resistance, reduces the key-seating sticking probability, improves the lower drilling tool job security.

Claims

1, a kind of Superdeep well great displacement high performance boring tool protector for well, be by last, lower contact body (1), (7), self-lubricating sealing ring group (2), sleeve (3), vibration isolation rubber cover (4), rolling bearing (5), box cupling shell (6) is formed, it is characterized in that: box cupling shell (6) is installed on the centralizer, following body joint (1), (7) locate, its external surface has medium runner (11) and wedge shape head tank (10), uniformly at intervals on box cupling shell (6), a pair of rolling bearing (5) is equipped with in its inside, and rolling bearing (5) directly is installed on joint body (1) and (7) to interference; Rolling bearing (5), sleeve (3) and self-lubricating sealing ring group (2) be the inner surface that is installed in box cupling shell (6) two ends of symmetry respectively, by the interior shaft shoulder of box cupling shell (6) location; Self-lubricating sealing ring group (2) contacts with joint body, and filling graphite in the chamber (9) is filled at the top that fill between chamber (8) and bearing and the joint body at the middle part that forms between two rolling bearings (5).

2, high-performance drilling tool protector according to claim 1; it is characterized in that: blowing or assembling one deck vibration isolation rubber cover (4) on inner surface rolling bearing (5) installation position of box cupling shell (6); itself and rolling bearing (5) are wide or short slightly, its thickness 5 ~ 8mm.

3, high-performance drilling tool protector according to claim 1; it is characterized in that: self-lubricating sealing ring group (2) places joint body and box cupling shell (6) to locate; each organizes self-lubricating sealing ring group (2) has 2 ~ 3 layers of self-lubricating sealing graphite circle to form, and is located by sleeve (3) between rolling bearing (5) and the self-lubricating sealing ring group (2).

4, high-performance drilling tool protector according to claim 1; it is characterized in that: on the ridge between wedge shape head tank (10) and the medium runner (11) cast or rolling one deck friction factor is lower, the abrasionproof effect better and the higher carbide alloy of side direction supporting capacity, its carbide alloy is a kind of of W-Co kind, tungsten titanium cobalt class, tungsten titanium cobalt tantalum class.