RU2061827C1 - Deflector of drill tool - Google Patents

Abstract

FIELD: well drilling. SUBSTANCE: deflector has three sections skewed in one plane. Alpha angle is formed by skewing two lower sections. The angle presets deflection. The angle may be increased by a value that does not exceed arcsin D₉-d_s/L_m.ss,, and two upper sections may be swan about their common axis to opposite directions and form functional additional angle β and additional transport angle g that is more of equal to arcsin D₉-d_s/L_m.ss,, where D_b if bit diameter, d_s is section diameter, L_m.s is middle section length. Deflector provides possibility to increase preset angle maintained capacity of the deflector through rectangular well shaft in transport position. EFFECT: high capacity.

Description

 The invention relates to the field of drilling and is intended for drilling a transitional curvilinear interval of a small radius of directional and horizontal wells. A well-known diverter drilling tool, consisting of three consecutively interconnected with two distortions of the tubular sections, forming in the distortions of the master and auxiliary angles located in the same plane (see "Reference engineer drilling" edited by V. I. Mishevich and N .A. Sidorova, vol. 2 M. Nedra, 1973, p. 3 Fig. 4 /.

 The disadvantage of such a diverter is the decrease in the intensity of the curvature of the curved transition interval as its length grows, because as the diverter moves along the transition interval, its upper elbow opens from the well wall, the diverter loses additional support and the deviation angle decreases.

 Known diverter drilling tool, consisting of three consecutively interconnected with distortions of the tubular sections, forming in the warps of the master and auxiliary angles located in the same plane, the sections forming the auxiliary angle of bias are fastened to each other with the possibility of swing relative to each other in the sector of the auxiliary angle . /cm. A.S. 1579958 cells E 21 B 7/08, 1990 /.

 In this diverter, not all the advantageous possibilities of swinging the sections were used to simultaneously increase its technical characteristics and its throughput through a straight borehole.

 The aim of the invention is to increase the intensity of the curvature of the transitional curved intervals of the wells with simultaneous regulation of this intensity by increasing the technical characteristics of the diverter of the drilling tool and maintaining its throughput through a straight borehole.

где D_д диаметр долота, d_с диаметр секций, L_ср.с. - длина средней, при работе отклонителя с использованием дополнительного вспомогательного угла величину расчетного заданного угла выбирают из условия его увеличения на величину не более чем

на секцию,образующей со средней секцией вспомогательный угол, установлена радиальная опора, причем радиальных опор установлено минимум две с возможностью продольного перемещения.This goal is achieved by the fact that in the known diverter of the drilling tool, including the first tubular section with a chisel at one end and rigidly connected with its other end, the second tubular section located with the formation between the axes of the first and second sections of the calculated deflection angle, the third section, connected with the second section with the possibility of swinging by the connecting unit forming the main auxiliary angle, the connection unit between the second and third sections is made with an additional angle in the plane of the sector the main auxiliary angle from the opposite side, and the value of the additional auxiliary angle is determined in accordance with the dependence

where D _{d the} diameter of the bit, d _{with the} diameter of the sections, L _cf. - the average length, when the diverter is used using an additional auxiliary angle, the value of the calculated predetermined angle is selected from the condition of its increase by no more than

a radial support is mounted on a section forming an auxiliary angle with the middle section, and at least two radial bearings are installed with the possibility of longitudinal movement.

 The implementation of the connection node between the second and third sections with an additional angle in the sector plane of the main auxiliary angle from the opposite side from it allows folding the diverter into its transport position to reduce its transverse dimensions and lower it into a well of reduced diameter, which reduces the cost of drilling straight boreholes.

позволяет максимально сократить поперечные габариты отклонителя и использовать ее как дополнительный перекос для передачи дополнительного отклоняющего момента на долото и определяется максимально возможным положением средней секции в стволе скважины заданного диаметра, который близок к диаметру спускаемого в него долота.The ability to swing sections in the direction opposite to the auxiliary angle by an amount not less

allows you to minimize the transverse dimensions of the deflector and use it as an additional skew to transmit additional deflecting moment to the bit and is determined by the maximum possible position of the middle section in the wellbore of a given diameter, which is close to the diameter of the bit lowered into it.

, где: D_ст.ск. диаметр ствола скважины, d_с-диаметр секции, L_ср.с. длина средней секции и является дополнительным транспортным углом. Возможность складывания отклонителя в транспортном положение позволяет увеличивать задающий угол отклонителя на величину транспортного угла. Однако зависимость величины этого угла от диаметра ствола скважины ограничивает возможность увеличения задающего угла при изменении диаметров стволов скважин в сторону их уменьшения. Замена диаметра ствола скважины на близ кий ему по значению диаметр долота практически не изменит значения транспортного угла, но обеспечит вписываемость отклонителя с увеличенным задающим углом в диапазон диаметров стволов скважин, в котором используется заданный диаметр долота. Таким образом транспортным углом является

, где D_д диаметр долота, а величина угла дополнительного качания секций не должна быть меньше

. Увеличение задающего угла перекоса не более чем на

повышает характеристику отклонителя без увеличения его размеров, увеличивает интенсивность искривления переходных криволинейных интервалов и сохраняет проходную способность отклонителя через прямолинейный ствол скважины. При увеличении угла больше чем на

отклонитель не пройдет через прямой ствол скважины.The maximum possible angle of inclination of the middle section of the deflector in the wellbore is determined from the geometric construction of the position of the deflector in the wellbore when touching the middle section of the opposite walls of the well. This angle is equal to

where: D _st.sk. borehole diameter, d _{with the} section diameter, L _cf. the length of the middle section and is an additional transport angle. The possibility of folding the deflector in the transport position allows you to increase the deflector deflection angle by the value of the transport angle. However, the dependence of the value of this angle on the diameter of the wellbore limits the possibility of increasing the reference angle when changing the diameters of the wellbores in the direction of their reduction. Replacing the diameter of the wellbore with a bit diameter close to it in value will practically not change the value of the transport angle, but will ensure that the diverter with the increased reference angle fits into the range of wellbore diameters in which the specified bit diameter is used. So the transport angle is

where D _{d the} diameter of the bit, and the angle of the additional swing sections should not be less

. An increase in the deflection angle of not more than

increases the characteristic of the diverter without increasing its size, increases the intensity of the curvature of transitional curvilinear intervals and maintains the passage ability of the diverter through the straight borehole. If the angle increases by more than

the diverter will not pass through the straight borehole.

 The installation of a radial support on the section, which forms an auxiliary angle with the middle section, centers this section when the deflector is lowered and facilitates its descent, and maintains the set value of the auxiliary angle in the open operating position in the curved wellbore.

 Installing a minimum of two radial bearings increases the rigidity of the upper section of the deflector in case of insufficiency. As a result, the deflection moment on the bit increases and the intensity of the transition interval curvature increases.

 The installation of radial bearings with the possibility of longitudinal movement provides control of the auxiliary angle and stiffness of the upper section of the deflector, which regulates the intensity of the curvature of the transition interval. The installation of radial bearings with the possibility of longitudinal movement provides control of the auxiliary angle and stiffness of the upper section of the deflector, which regulates the intensity of the curvature of the transition interval.

уменьшая таким образом поперечные габариты отклонителя и компенсируя повышенный на

перекос нижних секций.Before the launch, the diverter suspended above the wellhead along with the drill pipes is diverted from the axis of the wellbore towards the side of the wellbore wall until the generatrix of the upper section is located on a straight line with the generatrix of the wellbore, thus fixing the boundary of the possible diverter passage to one side of the wellbore well, then the diverter is transferred to the transport position, for which two of its lower sections are deflected from the upper section to the opposite stack of the wellbore at an angle

thus reducing the transverse dimensions of the deflector and compensating for the increased

skew of the lower sections.

 The invention is illustrated by drawings, where in FIG. 1 shows the design of the diverter, FIG. 2 the diverter in the transport position, in FIG. 3 shows a diverter installed at the bottom of the well; FIG. 4 - diverter in working position when drilling a transitional curvilinear interval, in FIG. 5 diverter in working position when drilling a transitional curved interval.

. Так, например, при диаметре долота 4 D_д 215,9 мм, диаметре секции d_с172 мм, и длине средней секции 2 L_ср.с. 1400, угол γ ≥ 2,5^°.. Благодаря наличию дополнительного угла γ качания секций задающий угол a может быть увеличен, но не более чем на

/фиг. 2-5/, и следуя конкретному примеру это увеличение угла не должно превышать 2,5^o. При оптимальном значении задающего угла α = 1,5^° и допустимом его превышении при дополнительном качании секций на

повышенное значение задающего угла может составить 4^o. На секции 1 установлена одна /фиг. 5/ радиальная опора 5 для поддержания заданного значения вспомогательного угла β при бурении криволинейного интервала ствола скважины, или несколько опор, но как минимум две /фиг. 4/, для повышения жесткости секции 1 как при забуривании, так и при бурении криволинейного интервала /фиг. 4 и 5/, и которые также можно использовать для поддержания заданного значения вспомогательного угла b при бурении криволинейного интервала ствола скважины.The drill tool diverter consists of tubular sections 1,2 and 2 / FIG. 1-5 /, connected in series with each other, to which the bit is attached. Sections 2 and 3 are rigidly fixed to each other with a skew and form the lower angle α defining the direction of curvature / Fig. 1/, and sections 1 and 2 are interconnected with the possibility of swinging in the plane of the angle a and form an alternating auxiliary angle b stabilizing the direction of curvature and alternating angle g / from 0 to the optimum value of the auxiliary angle 3 4.5 and opposite to the auxiliary angle b. 1 /, which is equal to or greater than

. So, for example, when the diameter of the bit is 4 D _d 215.9 mm, the diameter of the section d _with 172 mm, and the length of the middle section 2 L _cf. 1400, angle γ ≥ 2.5 ^° .. Due to the presence of an additional swing angle γ of the sections, the reference angle a can be increased, but no more than

/ Fig. 2-5 /, and following a specific example, this increase in angle should not exceed 2.5 ^o . With the optimal value of the reference angle α = 1.5 ^° and its permissible excess with additional swing sections

increased value of the reference angle may be 4 ^o . On section 1 is installed one / Fig. 5 / radial support 5 to maintain the specified value of the auxiliary angle β when drilling a curved interval of the wellbore, or several supports, but at least two / Fig. 4 /, to increase the rigidity of section 1 both during drilling and when drilling the curved interval / Fig. 4 and 5 /, and which can also be used to maintain a given value of the auxiliary angle b when drilling a curved interval of the wellbore.

 Radial bearings 5 are mounted longitudinally relative to section 1 for adjusting the set value of the auxiliary angle b and for adjusting the stiffness of section 1.

, равный в данном отклонителе 2,5^o. Затем поддерживая этот транcпортный перекос секций 1 и 2 отклонитель опускают в ствол скважины и доводят до забоя, при этом вершины 8 и 9 перекосов секций будут касаться противоположных стенок ствола скважины /фиг. 3 и 4/, а верхняя секция 1 отклонителя может быть перекошена с секцией 2 либо под углом

/фиг. 2/, либо большим

/фиг. 3 и 4/. В данном отклонителе этот перекос может изменяться в пределе от 2,5 до 8^o.Above wellhead 6, wells with an equal bore are suspended on drill pipes 7 with a deflector from sections 1,2 and 3 with functional and transport distortions of its sections at angles a, β and γ and bit 4 / Fig. 2 /. The diverter has increased geometric parameters that do not fit into the wellbore. So, for example, with the length of the section 3 in 1100 mm and the length of the section 2 L _cf. 1400 mm, the hard skew angle a between them a is 4 ^o , and for an arbitrary length of section 1, its flexible skew with section 2 has an angle b equal to 3.5 ^o to one side, and an angle g equal to 8 ^o to the opposite side. It is required to lower the diverter into the borehole with a diameter of D _st.sq. in 225 mm. Before lowering into the well, the deflector along with the drill pipes is diverted from the axis of the wellbore towards its wall until the deflector forming the upper section 1 is located on a straight line 11 / Fig. 2/ with the generatrix of the well, where the deflector is moved to the transport position, deflecting its two lower sections 2 and 3 from the upper section 1 to the opposite wall of the wellbore at an angle

equal in this diverter 2.5 ^o . Then, supporting this transport skew of sections 1 and 2, the deflector is lowered into the wellbore and brought to the bottom, while the peaks 8 and 9 of the skew sections will touch the opposite walls of the wellbore / Fig. 3 and 4 /, and the upper section 1 of the deflector can be skewed with section 2 or at an angle

/ Fig. 2 / or large

/ Fig. 3 and 4 /. In this diverter, this skew can vary in the range from 2.5 to 8 ^o .

составляющим в данном отклонителе 1,5^o и являющимся традициoнным. Затем по мере набора кривизны ствола скважины и поступления инструмента в искривленный участок ствола скважины перекос секций 1 и 2 под углом γ переходит в перекос под вспомогательным углом b /фиг.5/, с переходом упора вершины 10 этого угла о противопoложную нижнюю стенку ствола скважины, в которую упирается нижний перекос секций 2 и 3 и угол которого α = 4^°, во время изменения перекоса секций 1 и 2 постепенно полностью вступает в работу и наращивает интенсивность искривления ствола скважины, а после вступления в работу вспомогательного угла достигнутая заданная интенсивность искривления поддерживается на всем дальнейшем протяжении криволинейного интервала ствола скважины. Местом установки опор 5 регулируют жесткость секции 1 /фиг. 4 / и величину вспомогательного угла β /фиг. 5/, и соответственно величину результирующего отклоняющего момента на долото 4.The diverter works as follows. When drilling a curved interval / Fig. 3 and 4 / the diverter is in the transport position and deflects the wellbore at a partial angle from the angle α of the deflection, equal to

constituting 1.5 ^o in this diverter and being traditional. Then, as the curvature of the borehole increases and the tool enters the curved section of the borehole, the skew of sections 1 and 2 at an angle γ becomes skew at an auxiliary angle b / Fig. 5/, with the transition of the top 10 of this angle to the opposite bottom wall of the well, which abuts against the lower warp sections 2 and 3 and whose angle α = 4 ^°, while changing the skew of sections 1 and 2 gradually come into full operation and increases the intensity of the curvature of the borehole, and after the entry into operation of the auxiliary angle dos ignutaya predetermined intensity curvature is maintained throughout the entire further curved wellbore interval. The installation site of the supports 5 regulate the stiffness of the section 1 / Fig. 4 / and the value of the auxiliary angle β / Fig. 5 /, and accordingly the value of the resulting deflecting moment on the bit 4.

 The advantages of this diverter of the drilling tool is that it reduces the cost of drilling straight vertical boreholes with reduced diameters, which increases the construction efficiency of directional and horizontal wells. YYY2 YYY4

Claims (4)

1. The diverter of the drilling tool, comprising a first tubular section with a chisel at one end and a second tubular section rigidly connected to its other end, arranged to form a skew angle between the axes of the first and second sections, a third section that can be swiveled to the second section the connecting node forming the main auxiliary angle, characterized in that the connection node between the second and third sections is made with an additional angle in the plane of the sector of the main auxiliary SFA on the opposite side of it, and an additional auxiliary value of the angle is determined according to the relation

where D _{d the} diameter of the bit
d _{with the} diameter of the sections
L _{cf. the} length of the middle section. 2. The diverter according to claim 1, characterized in that when the diverter is operated using an additional auxiliary angle, the value of the calculated predetermined angle is selected from the condition of its increase by no more than

3. The rejector according to paragraphs. 1 and 2, characterized in that on the section forming the auxiliary angle with the middle section, a radial support is installed.  4. The diverter according to claims 1 and 3, characterized in that at least two radial bearings are installed.  5. The rejector according to paragraphs. 1, 3 and 4, characterized in that the radial bearings are mounted with the possibility of longitudinal movement.

Images