CN1373283A - Drill collar without destabilization - Google Patents
Drill collar without destabilization Download PDFInfo
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- CN1373283A CN1373283A CN 01108837 CN01108837A CN1373283A CN 1373283 A CN1373283 A CN 1373283A CN 01108837 CN01108837 CN 01108837 CN 01108837 A CN01108837 A CN 01108837A CN 1373283 A CN1373283 A CN 1373283A
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- Prior art keywords
- drill collar
- drill
- central tube
- pressure
- hydraulic
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Abstract
A drill collar without destabilization for drilling well in oil field is composed of central pipe, drill collar, upper and lower joints, and hydraulic oil. The internal diameter of drill collar is greater than that of upper piston of central pipe, and the diameter of said upper piston is greater than that of lower piston of central pipe. The upper drilling pressure acts on the central pipe and is converted o hydraulic pressure, which acts downward to become drilling pressure and acts on upper and lower joints. The hydraulic pull force can axially stretch the drill collar to increase its whole rigidity, so preventing skew effectively.
Description
The present invention is a kind of drill collar device a---drill collar without destabilization, it belongs to the nearly drill bit drill collar of oil field welldrilling, it comprises following architectural feature: promptly be made up of central tube, drill collar, upper and lower joint and hydraulic pressure wet goods, its drill collar internal diameter is greater than central tube upper piston diameter, and central tube upper piston diameter is greater than the lower piston diameter.
Disclose not crooked drill collar structure in " oil drilling technology " third phase P1 in 1999 page or leaf, Fig. 1 is not crooked drill collar structural representation: it by top connection, piston, outer tube, bear pipe, hydraulic oil, central tube, plug, lower contact etc. and form.It is by the distortion that bears the suffered pulling force opposing outer tube of pipe itself, and reaches the stable of outer tube.Weak point is a complex structure, and becomes conventional drill collar device after the hydraulic failure, influences its performance largely.Delivered the HCY oblique-proof device at " oil drilling technology " 1981 the 6th phase P11 page or leaf, Fig. 2 is the structural representation of HCY oblique-proof device, and it is by shell, pressurization core barrel, reducing joint, compositions such as centralizer.Its weak point is, under certain the pressure of the drill, the lateral deformation of pipe will apply lateral force to urceolus in the pressure-bearing, influence the stability of urceolus, and therefore, the pressure of the drill is also restricted.
The objective of the invention is to avoid above-mentioned deficiency of the prior art, and provide a kind of drill collar internal diameter greater than central tube upper piston diameter, central tube upper piston diameter is greater than the hydraulic pressure drill collar device of its lower piston diameter.The hydraulic coupling that central tube produced of top the pressure of the drill through installing directly acts on lower contact and transmits the pressure of the drill downwards.Therefore, can satisfy big the pressure of the drill, improve straight well section rate of penetration; And drill collar is in the pull bar state, does not have the unstability bending, has increased bottomhole assembly rigidity dramatically, has improved the anti-tranverse bending ability of this drill collar, controls hole deviation effectively.Fig. 3 is the drill collar without destabilization structure chart.
Purpose of the present invention, can reach by following measure: the piston bush of upper and lower piston rod of central tube and upper and lower joint and seal constitute piston pair up and down, drill collar and upper and lower joint link the oil pocket that connects, seals and are full of hydraulic oil, constitute hydraulic means, and central tube upper piston diameter D
SGreater than lower piston diameter D
x, i.e. D
S/ D
x＞1; The drill collar inner diameter d is greater than upper piston diameter D
S, i.e. d/D
S＞1; Top the pressure of the drill of this device imposes on central tube, under the effect of piston, converts hydraulic pressure to transmitting all around thereon; The formed hydraulic pressure value of the diameter difference of last lower piston passes to lower contact and forms the pressure of the drill, as long as its formed hydraulic coupling is in the bearing strength or sealability scope of device, device just can not reduce performance, therefore, can apply the needs that bigger the pressure of the drill satisfies drilling well, and the action of hydraulic force that acts on the lower contact equivalence is in the drill collar two ends, make drill collar be in tension state, promptly by the pressured state of conventional drill collar, become tension state, make its drill collar not have the condition of unstability, thereby the unstability bending can not take place; Because drill collar becomes hydraulic pressure draw-bar, greatly degree has improved the rigidity and the anti-transversal force crooking ability of self device.Top the pressure of the drill is big more, and the hydraulic pressure pulling force is also big more, and the rigidity of its device also increases.Therefore, this device is applied to nearly drill bit drill collar, can reach good anti-oblique well straightening effect, is specially adapted to easily tiltedly preventing tiltedly of district, anisotropic formation, and the stratum that dog-leg easily takes place.
Purpose of the present invention can also reach by following measure:
1, design has a shoulder near the central tube upper piston, in order to the moving and bear pulling force of spacing center-pole, can design spline on its shoulder and be connected to come transfer torque with the spline housing of top connection.See Fig. 3
2, the top design of the lower piston rod of central tube has a shoulder greater than the lower piston diameter, and circular bead surface is in the operating range 0-500mm of lower contact inner face, its role is to hydraulic failure after, the lower shoulder of central tube directly seat transmits the pressure of the drill in lower contact; Design has spline to be connected with the spline housing of lower contact on the shoulder, is used for transfer torque.The bottom design of lower piston rod has nut, is used for the mobile of spacing central tube and bears pulling force.See Fig. 4.
3, go up centralizer and top connection and link and connect, also can be one, its effect be set upright, spacing central tube.
4, central tube endoporus and lower contact endoporus constitute the circulation of drilling fluid path.
The present invention is described in further detail below in conjunction with drill collar without destabilization BSW-168 embodiment:
Physical dimension is as follows:
Effective length: L=8m; Drill collar external diameter: D=168mm;
Drill collar internal diameter: d=127mm; Central tube (bottom) external diameter: D
N=105mm;
Central tube (bottom) internal diameter: d
N=50mm; Central tube upper piston diameter: D
S=122mm;
Central tube lower piston diameter: D
x=100mm; Central tube lower shoulder diameter: D
t=126mm;
Inner distance: the S=100mm of shoulder and joint;
Upper and lower piston seals with y-type seal ring, and adopts top spline transfer torque.
BSW-168 is in top the pressure of the drill P=176.4 * 10
3Under the effect of N, form hydraulic pressure to transmitting all around through the central tube upper piston, then drill collar bears axial hydraulic pulling force N=49 * 10
3N; Only cause the axial tension distortion, therefore, buckling deformation can not take place in drill collar, does not have critical pressure yet, has maximum rigidity and stability, and is depressing work than wammel.In peupendicular hole.The deadweight of drill collar overlaps with the borehole axis line, does not consider to go up under the situation of moment M, and drilling tool keeps plumbness; In inclined shaft, because the influence of deadweight and last moment M, certainly lead to small flexural deformation, but this distortion is not to resemble the depression bar pressurized and the stable not enough buckling deformation that causes, but the distortion that produced by transverse load, and this distortion will be subjected to the restriction of pulling force N, promptly the pressure of the drill P is big more, the hydraulic pressure pulling force N that applies drill collar is also big more, and the distortion of drill collar diminishes.
Drill collar midway deflection relational expression:
f
max＝6.667×10
-3sina-0.683×10
-6M
When hole angle a=5 °, outer moment of flexure M=0, middle point deformation maximum value f
Max=0.581 * 10
-3Rice
By above analysis as can be known, drill collar without destabilization is depressed not at wammel can the unstability bending, in inclined shaft and under the effect of last moment of flexure, has only small deflection deformation, has big drilling assembly rigidity, can improve rate of penetration, and utilize different DHA to constitute packed hole assembly and prevent oblique well straightening with big pendulum assembly.
Claims (3)
1, drill collar without destabilization device that is used for oil field welldrilling, it is made up of central tube, drill collar, top connection, lower contact and hydraulic oil, and its drill collar inner diameter d is d/Ds＞1 greater than central tube upper piston diameter Ds; Central tube upper piston diameter Ds is greater than central tube lower piston diameter Dx, i.e. Ds/Dx＞1.Its feature is that top the pressure of the drill passes to hydraulic oil through the upper piston of central tube, and the hydraulic pressure of formation transmits formation the pressure of the drill downwards, and acts on upper and lower joint, forms the hydraulic pressure pulling force and puts on the drill collar two ends, makes drill collar become hydraulic pressure draw-bar; Because drill collar has lost the condition of unstability, the unstability bending can not take place, its drill collar stiffness maximum, and reach the purpose of preventing oblique well straightening.
2, the piston pair and the drill collar of claim 1. said central tubes and upper and lower joint composition constitute airtight oil pocket, and its feature is that the pressure of the drill is changed into hydraulic coupling.
3, the shoulder of the central tube lower end in the claim 1. and the activity of lower contact inner face ask that apart from S=0～500mm its feature is: after hydraulic failure, the center base is in lower contact, and the pressure of the drill is directly passed to lower contact through central tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108837 CN1373283A (en) | 2001-03-01 | 2001-03-01 | Drill collar without destabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108837 CN1373283A (en) | 2001-03-01 | 2001-03-01 | Drill collar without destabilization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1373283A true CN1373283A (en) | 2002-10-09 |
Family
ID=4657607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01108837 Pending CN1373283A (en) | 2001-03-01 | 2001-03-01 | Drill collar without destabilization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1373283A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029936A (en) * | 2019-04-23 | 2019-07-19 | 西南石油大学 | A kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool |
| CN112727380A (en) * | 2019-10-14 | 2021-04-30 | 航天科工惯性技术有限公司 | Sealing centralizer for high-temperature wireless while-drilling system and high-temperature wireless while-drilling system |
-
2001
- 2001-03-01 CN CN 01108837 patent/CN1373283A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029936A (en) * | 2019-04-23 | 2019-07-19 | 西南石油大学 | A kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool |
| CN110029936B (en) * | 2019-04-23 | 2020-06-30 | 西南石油大学 | Injection-type double-layer drill string anti-deviation straight drilling tool |
| CN112727380A (en) * | 2019-10-14 | 2021-04-30 | 航天科工惯性技术有限公司 | Sealing centralizer for high-temperature wireless while-drilling system and high-temperature wireless while-drilling system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |