CN103174791B - Drilling column shock excitation anti-drag tool - Google Patents

Drilling column shock excitation anti-drag tool Download PDF

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Publication number
CN103174791B
CN103174791B CN201310095502.2A CN201310095502A CN103174791B CN 103174791 B CN103174791 B CN 103174791B CN 201310095502 A CN201310095502 A CN 201310095502A CN 103174791 B CN103174791 B CN 103174791B
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CN
China
Prior art keywords
eccentric shaft
joint pin
tool joint
shaft
eccentric
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Application number
CN201310095502.2A
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Chinese (zh)
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CN103174791A (en
Inventor
管志川
张会增
玄令超
史玉才
廖华林
张洪宁
刘永旺
许玉强
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中国石油大学(华东)
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Priority to CN201310095502.2A priority Critical patent/CN103174791B/en
Publication of CN103174791A publication Critical patent/CN103174791A/en
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Publication of CN103174791B publication Critical patent/CN103174791B/en

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Abstract

The invention relates to the field of drilling tools of oil and natural gas, in particular to a drilling anti-drag tool which is used for stimulating a drilling column to produce periodical vibration. The tool comprises double female sleeves and upper double male connectors and lower double male connectors, wherein the upper double male connectors and the lower double male connectors are arranged at two ends of the double female sleeves in an inserting mode. The double female sleeves, the upper double male connectors and the lower double male connectors are all of hollow structures. The tool further comprises a power device and an eccentric shaft, wherein the power device is located in the upper double male connectors. The eccentric shaft is connected with the power device. A concentric section of the eccentric shaft is arranged in the hollow cavity of the double female sleeves through an alignment bearing, and an eccentric section of the eccentric shaft can rotate in the double female sleeves. According to the drilling column shock excitation anti-drag tool, positive pressure applied on a wall of a well by the drilling column is reduced periodically, static friction between the drilling column and the wall of the well is converted into dynamical friction, friction drag and moment of torsion between the drilling column and the wall of the well are obviously reduced, and the phenomena of 'pressure dragging and 'stick-slip vibration' appearing in a drilling process of a level section of a highly-deviated well and a shale gas horizontal well are effectively eliminated.

Description

Drill string exciting friction reducer

Technical field

The present invention relates to oil, gas drilling field of tool, particularly relate to a kind of drilling well friction reducer exciting drill string to produce periodic vibration.

Background technique

At high angle hole, (i.e. drilling well plagioclase is greater than 2 with the ratio of vertical depth, the directional well of hole angle in 60o ~ 86 °) (hole angle reaches or close to 90 ° for long horizontal sections and shale gas horizontal well, well bore creeps into the well of certain length along substantially horizontal) in drilling process, part drill string leans against on the lower borehole wall, very large frictional resistance and moment of torsion can be produced between drill string and the borehole wall, cause the pressure of the drill and moment of torsion to be successfully applied on drill bit, produce " dragging pressure " phenomenon, cause rate of penetration very low; Separately, frictional resistance huge between drill string and the borehole wall can make drill string produce " stick slip vibration " phenomenon, drill speed can reach very high values instantaneously, be easy to cause drill string to destroy, therefore, in high angle hole long horizontal sections, shale gas horizontal well drilling process, " dragging pressure " and " stick slip vibration " that high frictional resistance and moment of torsion cause becomes the key factor affecting drilling efficiency.

For the problem that " dragging pressure " and " stick slip vibration " phenomenon in high angle hole long horizontal sections, shale gas horizontal well drilling process causes drilling efficiency low, research shows: vibrate the Frotteurism that can change between friction pair, friction factor between friction pair is reduced, therefore, how vibrating drag reduction technology is applied to high angle hole long horizontal sections, shale gas drillstring in horizontal section drag reduction, with improve high angle hole long horizontal sections, shale gas horizontal well rate of penetration and ensure drilling safety, be an important directions of high frictional resistance well drilling technology.

Summary of the invention

(1) technical problem that will solve

Technical problem to be solved by this invention is: there is " dragging pressure " and " stick slip vibration " problem in high angle hole long horizontal sections, shale gas horizontal well drilling process.

(2) technological scheme

For solving the problems of the technologies described above, the invention provides a kind of drill string exciting friction reducer, this instrument comprises two mother sleeve and is inserted into the two tool joint pin of the two tool joint pin in top and bottom at its two ends, described pair of mother sleeve, the two tool joint pin of the two tool joint pin in top and bottom are hollow and arrange, this instrument also comprises power plant and eccentric shaft, wherein: described power plant are positioned at the two tool joint pin in top, for providing rotating power; Described eccentric shaft is connected with described power plant, and the concentric segments of eccentric shaft is arranged in the hollow cavity of two mother sleeve by alignment bearing, its eccentric segment can rotate in two mother sleeve, and for providing periodic eccentric force, this eccentric force is ordered about this instrument and produced periodic vibration.

Preferably, described power plant comprise line shaft, and one end of described line shaft extends in two mother sleeve vertically.

Preferably, the concentric segments of described eccentric shaft one end is fixedly connected with by coupling with line shaft.

Preferably, the concentric segments of the described eccentric shaft the other end extends in the two tool joint pin in described bottom.

Preferably, the hollow cavity be connected is provided with in described coupling, eccentric shaft and line shaft.

Preferably, the concentric segments at described eccentric shaft two ends is respectively equipped with the shaft shoulder fastened with alignment bearing, for realizing the axially locating of alignment bearing.

Preferably, the described shaft shoulder is set to the abutment sleeve that is sleeved on eccentric shaft.

Preferably, be provided with the two mother sleeve in top of coupling and the interior two mother sleeve in bottom being provided with eccentric shaft section in described pair of mother sleeve comprises, the two mother sleeve in described top is connected by the two tool joint pin in the middle part of hollow with the two mother sleeve in bottom.

Preferably, the seal arrangement suitable with eccentric shaft concentric segments is respectively equipped with in the hollow cavity of the two tool joint pin of the two tool joint pin in described middle part and bottom.

Preferably, lubricant oil is filled with in the two cavity between mother sleeve and eccentric shaft in described bottom.

(3) beneficial effect

Drill string exciting friction reducer provided by the invention, order about eccentric shaft by power plant and rotate generation eccentric force, and then order about friction reducer and neighbouring drill string generation periodically vibration thereof by this eccentric force, the positive pressure that drill string is acted on the borehole wall periodically reduces, the static friction between drill string and the borehole wall is made to become kinetic friction, frictional resistance between remarkable reduction drill string and the borehole wall and moment of torsion, effectively eliminate " dragging pressure " and " stick slip vibration " phenomenon existed in high angle hole long horizontal sections, shale gas horizontal well drilling process; Further, vibrating drag reduction instrument of the present invention, can be arranged on any section of drill string by two tool joint pins at two ends, use value is high; Further, this friction reducer is by the seal arrangement of ingenious setting, make eccentric shaft and alignment bearing be positioned at a closed chamber, the lubricant oil filled in this closed chamber plays lubrication to alignment bearing and thermolysis, substantially increases the working life of this instrument.

Accompanying drawing explanation

Fig. 1 is embodiments of the invention 1 structure principle charts;

Fig. 2 is that the A of embodiments of the invention 1 is to sectional view;

Fig. 3 is embodiments of the invention 2 structure principle charts;

Wherein: 1, two mother sleeve, 1-1, the two mother sleeve in top, 1-2, the two mother sleeve in bottom, 2, the two tool joint pin in top, 3, the two tool joint pin in bottom, 4, power plant, 4-1, line shaft, 5, eccentric shaft, 5-1, concentric segments, 5-2, eccentric segment, 6, the shaft shoulder, 7, the two tool joint pin in middle part, 8, alignment bearing, 8-1, top alignment bearing, 8-2, bottom alignment bearing, 9, seal arrangement, 10, coupling.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.

Be embodiments of the invention 1 as shown in Figure 1, 2, a kind of drill string exciting friction reducer, this instrument comprises two mother sleeve 1, the two tool joint pin 3 of the two tool joint pin 2 in top and bottom, the two tool joint pin 3 of the two tool joint pin 2 in top and bottom is inserted into the two ends of two mother sleeve 1 respectively, this instrument can be connected to any section of drill string by the two tool joint pin 3 of the two tool joint pin 2 in top and bottom, improves the practicability of this instrument.

Two mother sleeve 1, the two tool joint pin 3 of the two tool joint pin 2 in top and bottom is hollow and arranges, the power plant 4 for generation of eccentric force and eccentric shaft 5 is provided with in hollow cavity, periodic vibration is produced to be made this instrument by eccentric force, power plant 4 wherein can adopt positive displacement motor, turbine motor etc., it is positioned at the two tool joint pin 2 in top, for providing rotating power, the line shaft 4-1 of power plant 4 extends in two mother sleeve 1 vertically, the two tool joint pin 2 in top and line shaft 4-1 Spielpassung, to play radial spacing effect, prevent the two tool joint pin 2 in line shaft 4-1 and top from relative rocking occurring.The two tool joint pin in top can be set to the structures such as spliced, so that the installation of power plant.

Eccentric shaft 5 is connected with described power plant 4, preferably, eccentric shaft 5 being set to two ends is concentric segments 5-1, and relevant position has eccentric segment between two ends, the concentric segments 5-1 of eccentric shaft 5 one end is connected with the line shaft 4-1 of power plant 4 by coupling 10, order about eccentric shaft 5 by the line shaft 4-1 of power plant 4 to rotate, coupling 10 wherein such as can be set to two female joint, line shaft 4-1 and eccentric shaft 5 are to be threaded or the mode such as multiaspect prism and the grafting of multiaspect hole is connected to the two ends of two female joint, to reduce difficulty of processing; The concentric segments 5-1 of eccentric shaft 5 at least one end is arranged in the hollow cavity of two mother sleeve 1 by alignment bearing 8, illustrated alignment bearing is positioned at lower end, obviously, alignment bearing also can require to be arranged in the concentric segments of upper end according to specific design, or in the concentric segments at two ends, all alignment bearing is installed as shown in Figure 3, realized the location of radial direction to eccentric shaft 5 and axis by alignment bearing 8, prevent eccentric shaft 5 from two mother sleeve 1, relative rocking occurring, guarantee that it synchronous vibration can only occur; The eccentric segment 5-2 of eccentric shaft 5 can rotate freely in two mother sleeve 1, and namely in two mother sleeve 1, relevant position has the enough spaces supplying eccentric shaft 5 eccentric segment and rotate freely.

Above-mentioned line shaft 4-1, coupling 10 and eccentric shaft 5 are preferably set to hollow type structure, its hollow cavity be connected is fluid passage, when this instrument is arranged on any one section of drill string, this hollow type structure does not block the flowing of drilling fluid, can not affect the normal operation of drill string.

Accordingly, this instrument is arranged on drill string by the two tool joint pin 3 of the two tool joint pin 2 in the top at two ends and bottom, eccentric shaft 5 is driven to rotate by power plant 4 by line shaft 4-1, produce eccentric force, this eccentric force impels eccentric shaft 5 generating period to vibrate, can only synchronous vibration because eccentric shaft 5 to be connected with two mother sleeve 1 by alignment bearing 8, thus, eccentric shaft 5 drives two mother sleeve 1 synchronously to carry out periodic vibration, and then, the synchronous generating period vibration of drill string that this tool drives is coupled, this periodic vibration can effectively solve high angle hole long horizontal sections, " dragging pressure " of existing in shale gas horizontal well drilling process and " stick slip vibration " phenomenon and the problem such as cause the low and drill string of drilling efficiency easily damaged.

Obviously, it is structural design that is comparatively simple and comparatively low cost in embodiment 1, and in order to performances such as the stability that improves operation further, can be out of shape accordingly the structure such as running shaft, two mother sleeves and improve, be the specific embodiment after improvement (embodiment 2) as shown in Figure 3.

This embodiment has carried out corresponding improvement on the basis of embodiment 1, the difference of itself and embodiment 1 at least comprises: for strengthening the radial location effect of eccentric shaft 5, alignment bearing is provided with two, namely illustrates the top alignment bearing 8-1 be positioned at above eccentric segment and the bottom alignment bearing 8-2 be positioned at below eccentric segment; Corresponding with top alignment bearing 8-1 and bottom alignment bearing 8-2, the concentric segments 5-1 at eccentric shaft 5 two ends is respectively equipped with a shaft shoulder 6, two shaft shoulders 6 fasten with two alignment bearings respectively, for the axially locating of alignment bearing, wherein the shaft shoulder 6 is preferably set to be sleeved on the abutment sleeve on eccentric shaft 5, to reduce processing and assembling difficulty; For further improving the stability of operation and reducing processing and assembling difficulty, two mother sleeve 1 is set to the two mother sleeve 1-1 in top that is plugged in together by the two tool joint pin 7 in middle part and the two mother sleeve 1-2 in bottom, coupling 10 is wherein positioned at the two mother sleeve 1-1 in top, and the eccentric segment 5-2 of eccentric shaft 5 and top alignment bearing 8-1, two shaft shoulders 6, bottom alignment bearing 8-2 are positioned at the two mother sleeve 1-2 in bottom, the two tool joint pin 7 in middle part is Spielpassung with the concentric segments 5-1 of eccentric shaft 5, plays the effect of auxiliary stopper.Separately, concentric segments 5-1 transmission shaft being illustrated lower end extends in the two tool joint pin 3 in bottom vertically, and the two tool joint pin 3 of this concentric segments 5-1 and bottom is Spielpassung, to play the effect of auxiliary stopper.

For fully improving the working life of this instrument, need lubricate top alignment bearing 8-1 and bottom alignment bearing 8-2 and dispel the heat, accordingly, the seal arrangement 9 suitable with eccentric shaft 5 concentric segments 5-1 is respectively equipped with in the hollow cavity of the two tool joint pin 3 of the two tool joint pin 7 in middle part and bottom, by seal arrangement 9, the two mother sleeve 1-2 in bottom forms one and closes chamber, in this chamber, namely lubricant oil is filled in the two cavity between mother sleeve 1-2 and eccentric shaft 5 in bottom, and namely the eccentric segment of eccentric shaft 5 rotates in the lubricant oil environment of these enclosed cavity indoor, and then the effect played top alignment bearing 8-1 and bottom alignment bearing 8-2 sufficient lubrication and heat radiation, improve the working life of alignment bearing.

Finally it should be noted that, above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those skilled in the art are to be understood that, can modify to technological scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (4)

1. a drill string exciting friction reducer, this instrument comprises two mother sleeve and is inserted into the two tool joint pin of the two tool joint pin in top and bottom at its two ends, described pair of mother sleeve, the two tool joint pin of the two tool joint pin in top and bottom are hollow and arrange, it is characterized in that, this instrument also comprises power plant and eccentric shaft, wherein:
Described power plant are positioned at the two tool joint pin in top, for providing rotating power;
Described eccentric shaft is connected with described power plant, and the concentric segments of eccentric shaft is arranged in the hollow cavity of two mother sleeve by alignment bearing, its eccentric segment can rotate in two mother sleeve, and for providing periodic eccentric force, this eccentric force is ordered about this instrument and produced periodic vibration;
Described power plant comprise line shaft, and one end of described line shaft extends in two mother sleeve vertically, and the two tool joint pin in top and line shaft Spielpassung;
The concentric segments of described eccentric shaft one end is fixedly connected with by coupling with line shaft; The concentric segments of the described eccentric shaft the other end extends in the two tool joint pin in described bottom;
The concentric segments at described eccentric shaft two ends is respectively equipped with the shaft shoulder that fastens with alignment bearing for realizing the axially locating of alignment bearing, the described shaft shoulder is set to the abutment sleeve be sleeved on eccentric shaft;
Be provided with the two mother sleeve in top of coupling and the interior two mother sleeve in bottom being provided with eccentric shaft section in described pair of mother sleeve comprises, the two mother sleeve in described top is connected by the two tool joint pin in the middle part of hollow with the two mother sleeve in bottom; The concentric segments Spielpassung of the two tool joint pin in described middle part and eccentric shaft; The concentric segments Spielpassung of the two tool joint pin in described bottom and eccentric shaft.
2. drill string exciting friction reducer according to claim 1, is characterized in that: described coupling, eccentric shaft be provided with the hollow cavity be connected in line shaft.
3. drill string exciting friction reducer according to claim 1, is characterized in that: be respectively equipped with the seal arrangement suitable with eccentric shaft concentric segments in the hollow cavity of the two tool joint pin of the two tool joint pin in described middle part and bottom.
4. drill string exciting friction reducer according to claim 1, is characterized in that: be filled with lubricant oil in the two cavity between mother sleeve and eccentric shaft in described bottom.
CN201310095502.2A 2013-03-22 2013-03-22 Drilling column shock excitation anti-drag tool CN103174791B (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405287B (en) * 2014-10-19 2016-05-04 长江大学 A kind of drilling well dipulse hydroscillator
CN105178860B (en) * 2015-09-09 2017-05-10 长江大学 Torsional pendulum oscillator

Citations (3)

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Publication number Priority date Publication date Assignee Title
SU1125353A1 (en) * 1983-01-10 1984-11-23 Волгоградский государственный научно-исследовательский и проектный институт нефтяной промышленности Above-bit shock absorber
SU1633087A1 (en) * 1988-06-14 1991-03-07 Ивано-Франковский Институт Нефти И Газа Oscillator
CN102733756A (en) * 2012-07-23 2012-10-17 中国石油大学(华东) Vibration and pressure well drilling tool

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Publication number Priority date Publication date Assignee Title
US7708088B2 (en) * 2008-04-29 2010-05-04 Smith International, Inc. Vibrating downhole tool
CN102747958B (en) * 2012-07-23 2015-01-07 中国石油大学(华东) Compound vibrating well-drilling tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1125353A1 (en) * 1983-01-10 1984-11-23 Волгоградский государственный научно-исследовательский и проектный институт нефтяной промышленности Above-bit shock absorber
SU1633087A1 (en) * 1988-06-14 1991-03-07 Ивано-Франковский Институт Нефти И Газа Oscillator
CN102733756A (en) * 2012-07-23 2012-10-17 中国石油大学(华东) Vibration and pressure well drilling tool

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