CN2157298Y

CN2157298Y - Adjustable bent

Info

Publication number: CN2157298Y
Application number: CN 93204174
Authority: CN
Inventors: 丁尔启
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-02
Filing date: 1993-03-02
Publication date: 1994-02-23
Anticipated expiration: 2003-03-02

Abstract

The utility model relates to an adjustable bend used for drills to drive inclined wells, comprising two connecting pipes which are connected together by an inner sleeve whose peripheral middle part is provided with a spline whose both sides are respectively provided with two sections of outer screws connected with the two connection pipes, wherein, the axial cord of one section of the outer screw is intersected with the axial cord of the inner sleeve to form an angle B; the inner screw of the connecting pipe connected with the section of the outer screw is intersected with the axial cord of the connecting pipe to form the same angle B; the end surface of the connecting pipe is vertical with the axial cord of the inner screw; the inner sleeve is connected with an outer sleeve. The utility model has the advantages of the adjustment of the bending angle, operating time saving, manpower saving and no need of a plurality of bends.

Description

Adjustable bent

The utility model relates to a kind of adjustable bent sub that uses on the inclined shaft drilling tool of beating.

In oil exploration and exploitation, often need to beat inclined shaft.When beating inclined shaft, need between drilling tool drive unit and drill bit, add a bent sub.Existing bent sub has two tube connectors, and these two tube connectors are one, form a fixing angle each other.When needs change this angle, just have to unload of the bent sub replacement of this bent sub from drilling tool with another angle, so both time-consuming, require great effort again, and need the bent sub of a plurality of different sizes of configuration.

The purpose of this utility model provides a kind of adjustable bent sub, and it does not need to unload the angle that can adjust bending from drilling tool.

The utility model is achieved in that adjustable bent sub comprises two tube connectors, two tube connectors are linked together by overlapping in one, the mid portion of interior cover periphery has the spline of projection, the spline both sides are shaped on two sections external screw threads that connect with two tube connectors respectively, the wherein dead in line of first section externally threaded axis and interior cover, the axes intersect of second section externally threaded axis and interior cover is B at an angle; The internal thread of the tube connector that connects with second section external screw thread and the axis of this tube connector also intersect a same angle B, and the axis normal of the end face of this tube connector and its internal thread; Be connected with an overcoat with corresponding spline on the spline of interior cover projection, this overcoat is between the opposing end surface of two tube connectors.And its close second section externally threaded end face is perpendicular to second section externally threaded axis.When initial position, because the axes intersect of second section externally threaded axis and interior cover is B at an angle, the internal thread of the tube connector that connects with second section external screw thread simultaneously and the axis of this tube connector also intersect a same angle B, therefore, two tube connectors and interior cover three are coaxial state, that is to say, adjustable bent sub is straight state, if the connector that rotation connects with second external screw thread, at this moment the axis of cover in the axis of this connector begins to depart from, with the axis shape of interior cover at an angle, that is to say that adjustable bent sub is curved state.When the connector Rotate 180 degree (apart from initial position) that connects with second external screw thread, adjustable bent sub just curves maximum angle, and can draw this maximum angle at an easy rate according to geometrical analysis is 2B.Therefore, the utility model rotates the connector that connects with second external screw thread in use, and the angle of the axis of the axis of this connector and another connector and interior cover changes between 0～2B, thereby realizes the bending adjustment of adjustable bent sub.

Because the utility model only need rotate the connector that connects with second external screw thread, just can adjust its angle of bend, therefore it needn't unload from drilling tool, thereby can save operating time and manpower, in addition, needn't dispose a plurality of bent subs, only need a bent sub can satisfy the requirement of differently curved degree.

The contrast accompanying drawing is described in detail present embodiment in conjunction with the embodiments below:

Fig. 1 is the outline drawing of an embodiment of the utility model;

Fig. 2 is the structure sectional view of this embodiment;

Fig. 3 is an A-A sectional view among Fig. 2;

Fig. 4 is the schematic diagram of overcoat among Fig. 2;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is the schematic diagram of interior cover among Fig. 2;

Fig. 7 is the right view of Fig. 6;

Fig. 8 is the schematic diagram of a tube connector among Fig. 2;

Fig. 9 is that the K of Fig. 8 is to view;

Figure 10 is the schematic diagram that this embodiment bends to maximum angle.

Referring to Fig. 1 and Fig. 2, adjustable bent sub comprises two tube connectors (1,2), and two tube connectors belong to prior art with the part that the drilling tool drive unit is connected with drill bit, so omit among the figure.Two tube connectors (1,2) are linked together by cover (3) in.

Referring to Fig. 6 and Fig. 7, the mid portion of interior cover (3) periphery has the spline (4) of projection, and spline (4) both sides are shaped on the two sections external screw threads (5,6) that connect with two tube connectors (1,2) respectively.The wherein dead in line of the axis of first section external screw thread (5) and interior cover (3), the axes intersect of the axis of second section external screw thread (6) and interior cover (3) is B at an angle.This angle B can be 1～3 degree, and present embodiment adopts 1.5 degree.

Referring to Fig. 8, the axis of the internal thread (7) of the tube connector (2) that connects with second section external screw thread (6) and the axis of this tube connector (2) also intersect a same angle B.Just as mentioned before, this angle B can be 1～3 degree, and present embodiment adopts 1.5 degree.End face (8) of this tube connector (2) and the axis normal of its internal thread (7).

As shown in Figure 2, in be connected with a overcoat (10) on spline (4) of cover (3) projection with corresponding spline (9), spline (9) as shown in Figure 4, it with Fig. 7 in overlap (3) spline (4) cooperate, internally cover (3) is mobile mutually can to make overcoat (10), but can not relatively rotate.This overcoat (10) is positioned at (see figure 2) between the opposing end surface of two tube connectors (1,2), and it is near the end face (11) of second section external screw thread (6) the axis (see figure 5) perpendicular to second section external screw thread (6).Can guarantee that like this, just this end face (11) tightly fits with the end face (8) of tube connector (2) all the time.

Referring to Fig. 8, Fig. 9, Fig. 4 and Fig. 5, the end of the tube connector (2) that connects with second section external screw thread (6) has keyway (12).Have key tooth (13) on overcoat (10) and this keyway (12) opposing end faces (11).When key tooth (13) inserts in the keyway (12), can prevent that the flexibility that has mixed up from changing voluntarily.Certainly, do not advance keyway (12) in order to prevent that adjustable connector key tooth (13) when the bending from inserting, the degree of depth of keyway (12) should be greater than the thickness of key tooth (13), and this belongs to Machine Design general knowledge, and the quantity of this keyway (12) and key tooth (13) is 18.

Referring to Fig. 2, Fig. 3, Fig. 6 and Fig. 7, on the end face of last second section external screw thread (6) one side of interior cover (3) spacing block set (14) (cuing open among Fig. 2) is arranged, and have stop screw (15) on the tube connector (2) that second section external screw thread (6) connects.This stop screw (15) cooperates with spacing block set (14), and can limit tube connector (2) can only the Rotate 180 degree, in order to avoid tube connector (2) breaks away from the normal position that cooperates.

Position shown in Figure 2 is the initial position of adjustable bent sub.At this moment, two tube connectors (1,2) and interior cover (3) three are coaxial state, and promptly adjustable bent sub is straight state.When adjusting flexibility, elder generation's rotary connecting joint (1) withdraws from a segment distance, overcoat (10) is and then retreated, make key tooth (13) break away from keyway (12), rotary connecting joint (2) is to required flexibility then, make overcoat (10) be close to connector (2) at last, key tooth (13) inserts in the keyway (12) simultaneously, tightens connector (1) at last and gets final product.When connector (2) Rotate 180 degree (apart from initial position), adjustable bent sub just curves maximum angle (present embodiment is 3 degree), as shown in figure 10.

Claims

1, a kind of adjustable bent sub comprises two tube connectors, it is characterized in that: two tube connectors are linked together by overlapping in one; The mid portion of interior cover periphery has the spline of projection, the spline both sides are shaped on two sections external screw threads that connect with two tube connectors respectively, the wherein dead in line of first section externally threaded axis and interior cover, the axes intersect of second section externally threaded axis and interior cover is B at an angle; The internal thread of the tube connector that connects with second section external screw thread and the axis of this tube connector also intersect a same angle B, and the axis normal of the end face of this tube connector and its internal thread; Be connected with an overcoat with corresponding spline on the spline of interior cover projection, this overcoat is between the opposing end surface of two tube connectors, and its close second section externally threaded end face is perpendicular to second section externally threaded axis.

2, adjustable bent sub according to claim 1 is characterized in that: the end of the tube connector that connects with second section external screw thread has keyway, has the key tooth on overcoat and this keyway opposing end faces.

3, adjustable bent sub according to claim 1 and 2 is characterized in that: in put on the end face of second section external screw thread one side spacing block set arranged, and have stop screw on the tube connector that second section external screw thread connects.

4, adjustable bent sub according to claim 1 and 2 is characterized in that: angle B is 1～3 degree.

5, adjustable bent sub according to claim 2 is characterized in that: the quantity of keyway and key tooth is 18.