CN201567962U - Well deviation protective PDC drill - Google Patents

Abstract

The utility model discloses a well deviation protective PDC drill, which comprises blade wings and upper gauge protections connected on the drill, wherein lower gauge protections are arranged at the lower part of the water course between the adjacent gauge protections, and the lengths of the upper gauge protections are identical to that of the lower gauge protections. Displacement arrangement between the upper gauge protections and the lower gauge protections increases the arc lengths of the gage protections and the well wall by one time, and the specific value E of the sum of the gauge protection widths and the excircle circumference of the drill is increased by one time, thereby greatly increasing the stability of the well drilling; and the upper gauge protections and the lower protections are clung to the well wall simultaneously, so that the deviation protective function of the drill is greatly improved.

Description

Anti-inclination PDC drill bit

Technical field

The utility model relates to the PDC drill bit, and is concrete, relates to a kind of anti-inclination PDC drill bit.

Background technology

Drilling well is the basic means of the subterranean resource such as petroleum gas exploration exploitation, also is fund and technology-intensive specialized engineering. Advanced drilling well technology has been brought into play irreplaceable important function at aspects such as resources exploration speed such as accelerating oil gas. Therefore, carry out the research of drilling well technology and drilling tool, to the exploration development efficiency that improves the subterranean resource such as China's oil gas and participate in world-technology market competition etc., all be of great practical significance and strategic importance. How realizing efficiently anti-obliquely when drilling well, is one of situ of drilling well technology difficult problem of often running into. If hole deviation is excessive, can make well depart from underground design target, upset the layout of oil gas field exploitation. For investigation and prospecting, hole deviation is large, can make well depth generation error, and the geologic information that obtains is untrue, even departs from exploration targets. Well has been beaten tiltedly, itself has increased difficulty also for the drilling well engineering, even causes serious down-hole accident. Concerning oil extraction operation, hole deviation is crossed normally the carrying out of separate zone production, water filling work that conference directly affects the down-hole, and pumpingh well is also often caused the wearing and tearing of sucker rod and fractures. So the excessive exploration to the oil gas field of hole deviation has very large harm with exploitation.

Development along with the PDC bit technique, its technology and economic advantage are more and more obvious, used the PDC drill bit to compare with rock bit in area, west, river since 1998, single drill bit drilling depth and mechanical drilling speed all are doubled and redoubled, drilling period has shortened more than 50%, every meter drilling cost decrease has obtained significant economic benefit and social benefit. But, when using the drilling well of PDC drill bit, owing to the reason of geological condition, drilling tool structure and wellbore construction causes the situation of borehole decline frequently to occur, this kind hole deviation can affect drilling well off-design target, cause in the drilling well engineering, can reducing drilling quality, even cause the oil gas well to scrap. For preventing hole deviation or entangling tiltedly, can take some measures in the drilling well engineering. Such as traditional deviation control with drilling straight well technology, no matter be the natural deflecting feature on BHA itself or stratum, all require the size of restriction the pressure of the drill, even require " the light pressure hung up and beaten ", thereby seriously reduced the efficient of drilling well. Figure 1 shows that existing common PDC drill bit, the gauge of ining succession under its each bar wing, gauge length L is generally 50mm-120mm. When drilling well, gauge is to be attached on the drill bit borehole wall that smear metal is good, plays the righting drill bit, prevents vibrations, and certain anti-inclination effect is also arranged simultaneously, but because the limited length of L, therefore anti-oblique ability is relatively poor. Therefore, need to improve existing PDC drill bit, to overcome the problem of its anti-oblique ability.

Practical novel content

The purpose of this utility model is in order to overcome the defective of prior art, a kind of anti-inclination PDC drill bit to be provided, and to solve the existing relatively poor problem of the anti-oblique ability of PDC drill bit, it is used to be particularly useful for beating vertical oil gas well.

For achieving the above object, the technical solution adopted in the utility model is:

Anti-inclination PDC drill bit comprises the wing and the upper gauge that are positioned on the bit matrix, and upper gauge is connected in the wing below, and described upper gauge below is provided with lower gauge.

Described lower gauge and upper gauge arrange and the arrangement that radially is interspersed on bit matrix in pairs.

Described upper gauge is identical with lower gauge length.

Principle: $E=\frac{2B\·Z}{\mathrm{\πD}},$ In the formula, B is a gauge width, and Z is drill bit wing number, and D is the drill bit design diameter. From axially, because misplacing with lower gauge, upper gauge arranges that the arc length that makes gauge contact the borehole wall has increased by one times, this also just makes the ratio E of gauge width sum and drill bit outer circumference increase by one times. When drilling well since on gauge and lower gauge be attached on the borehole wall simultaneously, and upper gauge and lower gauge be L+e+L (e is the vertical range between upper gauge and the lower gauge) in the total span on the borehole wall, therefore greatly improved the anti-oblique effect of righting. Lower gauge is to be in drill bit water channel below, but can be not influential to flowing of mud.

The beneficial effects of the utility model are:

(1) in the utility model since on the bit matrix, on gauge below increased time gauge, and upper gauge and the lower gauge arrangement that is interspersed, make the arc length of the gauge contact borehole wall increase by one times, this also just makes the ratio E of gauge width sum and drill bit outer circumference increase by one times, has greatly improved drilling stability;

(2) upper gauge and lower gauge are attached on the borehole wall simultaneously in the utility model, and upper gauge and lower gauge be L+e+L (e is the vertical range between upper gauge and the lower gauge) in the total span on the borehole wall, the anti-oblique effect of righting that has therefore greatly improved drill bit;

(3) in the utility model, lower gauge is in bit matrix water-supply line below, but can be not influential to flowing of mud.

Description of drawings

Fig. 1 is existing common PDC drill bit structure schematic diagram;

Fig. 2 is the utility model structure schematic diagram;

Fig. 3 is the utility model top view.

The corresponding component names of mark among the figure: the upper gauge of 1-; Gauge under the 2-; The 3-wing.

Concrete enforcement mode

As shown in Figure 1, anti-inclination PDC drill bit comprises the wing 3 and the upper gauge 1 that are positioned on the bit matrix, and upper gauge 1 is connected in wing 3 belows, and upper gauge 1 below is provided with lower gauge 2. Lower gauge 2 and upper gauge 1 arrange and the arrangement that radially is interspersed on bit matrix in pairs. Upper gauge 1 is identical with lower gauge 2 length.

The gauge of ining succession under each bar wing of common PDC drill bit, its length L is generally 50mm-120mm, during drilling well because the limited length of L, anti-oblique ability. The utility model is provided with lower gauge 2 below the water channel between the gauge 1 on common PDC drill bit adjacent, upper gauge 1 is crisscross arranged with lower gauge 2, and upper gauge 1 all is attached on the borehole wall with lower gauge 2 during drilling well, has greatly improved the anti-oblique effect of drill bit.

The above; only be better embodiment of the present utility model; be not that the utility model is done any formal restriction, any simple modification, the equivalent variations on every foundation technical spirit of the present utility model above embodiment done all fall within the protection domain of the present utility model.

Claims (3)

1. anti-inclination PDC drill bit comprises the wing (3) and the upper gauge (1) that are positioned on the bit matrix, and upper gauge (1) is connected in wing (3) below, it is characterized in that, described upper gauge (1) below is provided with lower gauge (2).

2. anti-inclination PDC drill bit according to claim 1 is characterized in that, the arrangement that arranges in pairs and radially be interspersed on bit matrix of described lower gauge (2) and upper gauge (1).

3. anti-inclination PDC drill bit according to claim 1 and 2 is characterized in that, described upper gauge (1) is identical with lower gauge (2) length.

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