CN210067970U

CN210067970U - Cut-in type direct-rotation mixed jet flow self-advancing nozzle

Info

Publication number: CN210067970U
Application number: CN201821671957.9U
Authority: CN
Inventors: 付必伟; 张春亮; 杨迎新
Original assignee: Chengdu Weiyi Petroleum Technology Co Ltd; Southwest Petroleum University
Current assignee: Chengdu Weiyi Petroleum Technology Co Ltd; Southwest Petroleum University
Priority date: 2018-10-15
Filing date: 2018-10-15
Publication date: 2020-02-14
Anticipated expiration: 2028-10-15

Abstract

The utility model discloses a cut-in formula vertical rotation mixes efflux from advancing formula nozzle belongs to oil field oil recovery engineering technical field. The mixing device comprises a mixing fluid, wherein a mixing cavity, a central hole communicated with the mixing cavity and at least two cut-in grooves communicated with the mixing cavity are formed in the mixing fluid; the central hole is used for forming liquid direct current in the mixed flow cavity, the cut-in groove is used for forming liquid rotational flow in the mixed flow cavity, and the two jet flows form direct-rotation mixed jet flow in the mixed flow cavity. An object of the utility model is to provide a cut-in formula vertical rotation mixes efflux from advancing formula nozzle, can be with the broken rock of the efflux mode of reliable structure, vertical rotation mixture, in extension nozzle working life, improves broken rock efficiency.

Description

Cut-in type direct-rotation mixed jet flow self-advancing nozzle

Technical Field

The invention belongs to the technical field of oil field oil extraction engineering, and particularly relates to a cut-in type direct-rotation mixed jet flow self-advancing nozzle.

Background

In the actual production process, the high-pressure jet technology is widely applied as a novel rock breaking technology. In general, the generation of high-pressure jets is carried out by means of jet nozzles. Currently, the jet nozzles commonly used in hydraulic drilling operations include multi-orifice jet nozzles and rotary jet nozzles.

The multi-hole jet nozzle is similar to a circular hole direct jet nozzle, and is simple in structure and easy to process. However, the multi-hole jet nozzle has a large energy transfer distance, rocks are broken in an impacting mode, the energy utilization rate is low, the impacting area of the multi-hole jet at the bottom of a hole is uneven, formed holes are irregular, rock debris cannot be removed conveniently, and the drilling efficiency is low. The rotary jet nozzle improves the shearing and tensile damage effect of jet flow on rocks and improves the rock breaking effect of the jet flow. Due to the low velocity zone in the central region of the jet, a boss is easily formed at the center of the well bottom to prevent the system from being pushed forward.

In recent years, workers in the art have introduced spinning mixing nozzles in the market of current applications by directly combining the above-described direct flow structure and rotary jet flow structure. The existing direct-rotating mixing nozzle has a vane type structure, the vane rotates the liquid, the rotated liquid is in an independent chamber and is sprayed out from an independent nozzle, the direct jet formed by the central nozzle is also sprayed out from the independent nozzle, and the two are relatively independent. The jet flow generated by the structure has good rock breaking effect in the central area and the peripheral area of the jet flow, an obvious low-speed area can exist between the two areas, and an obvious annular boss can exist in the low-speed area, so that the problems that the hole bottom is not flat and the nozzle cannot be pushed forward are caused.

Disclosure of Invention

The invention aims to: the cut-in type direct-rotation mixed jet flow self-advancing nozzle can break rock in a reliable structure and a direct-rotation mixed jet flow mode, and improves the rock breaking efficiency while prolonging the service life of the nozzle.

The purpose of the invention is realized by the following technical scheme:

the invention provides a cut-in type direct-rotation mixed jet flow self-advancing nozzle which comprises a mixed fluid, wherein the mixed fluid is provided with a mixed flow cavity, a central hole communicated with the mixed flow cavity and at least two cut-in grooves communicated with the mixed flow cavity. The central hole is used for forming direct jet flow in the mixing cavity, and the cut-in groove forms rotary jet flow in the mixing cavity.

Preferably, the nozzle further comprises a mixed fluid seat, and the mixed fluid seat is provided with a fluid channel for ejecting liquid in the mixed fluid cavity; the mixed fluid is fixedly connected in the mixed fluid seat, or the mixed fluid and the mixed fluid seat are integrally formed.

The fixed connection in the above structure is mainly the connection means known to researchers in the field, such as screw connection, interference fit, welding, mechanical clamp, etc. The material of the nozzle shell can be steel or hard alloy. The material of the fluid mixture and the fluid mixture seat can be steel, hard alloy and composite material for reinforcing the diamond surface.

Preferably, the mixed fluid seat is provided with an accommodating groove, and the mixed fluid is fixedly connected with the mixed fluid seat through the accommodating groove.

Preferably, the nozzle also comprises a nozzle shell, and the inside of the nozzle shell is communicated with the mixed flow cavity through a central hole and an incision groove; the nozzle shell is provided with a front nozzle, and the mixed flow body seat is fixedly connected in the nozzle shell.

Preferably, the nozzle shell is further provided with a rear nozzle, the rear nozzle is arranged on the side wall of the nozzle shell, and the rear nozzle is used for communicating the inner space of the nozzle shell with the outer space of the nozzle shell.

Preferably, the phase angle epsilon between the cutting inlet and the cutting outlet of the cutting groove is in the range of 0 DEG less than | epsilon | and less than or equal to 90 deg.

In the structure, one end of the cut-in groove connected with the mixed flow cavity is a cut-out opening, and one section of the cut-in groove far away from the mixed flow cavity is a cut-in opening. The phase angle between the entry and the exit of the entry slot is the angle between the centroid of the entry slot and the centroid of the exit slot in the plane perpendicular to the axis of the fluid mixer, as shown in fig. 3. Generally, the centroid is expressed in cross section, and the outer contour of the mixed fluid where the incision is located and the mixed fluid cavity where the incision is located are generally revolution surfaces, so the centroid described herein describes the revolution surfaces as being approximately planar or cross-sectional. When the outer surface of the mixing fluid is a plane, the centroid of the inlet is the exact centroid. The sign of the agreed phase angle epsilon here is: drawing a line from the centroid of the incision to the centroid of the incision, wherein if the trend is counterclockwise, the line is positive, and if the trend is negative, the line is negative; fig. 3 shows a positive phase angle, and fig. 5 shows a negative angle.

Preferably, the height difference angle δ between the entry and exit of the entry slot is in the range of 0 ° ≦ δ ≦ 75 °.

In the above structure, the height difference angle between the entry and exit of the entry slot refers to the angle between the centroid of the entry slot and the centroid of the exit slot in a plane parallel to the axis of the fluid mixer, as shown in fig. 4 (in the figure, the entry and exit slots of the entry slot are both circular).

Preferably, the number of the cut-in grooves is 3, 4 or 5.

Preferably, the cut-in groove spatial configuration comprises a linear type, an arc type, an elliptical type, a spiral type or a combination thereof.

Preferably, the shape of the incisions and/or cutouts of the incised slots may be circular, semicircular, elliptical, rectangular, rhombic, or a combination thereof.

Further preferably, the size of the cut-in opening and the size of the cut-out opening of the cut-in groove are different.

Preferably, the mixing chamber and the cut-in groove of the mixing fluid extend to the first end surface in the axial direction of the nozzle, and a flow distribution body is arranged at the upper end of the mixing fluid (on the first end surface).

Further preferably, the mixer body is integrated with the mixer body seat.

In the structural scheme of the invention, the special connection mode which is integrated into a fixed connection mode refers to that parts with different functions are integrated together by machining the same blank.

Preferably, the mixer body seat is provided with a boss extending from the first end surface of the mixer body seat.

The invention has the beneficial effects that:

(1) the cut-in groove of the nozzle is short in flow channel, the contact time of fluid and the flow channel is shortened, and energy loss is reduced.

(2) Can form the direct-rotating mixed jet with higher peripheral rotating speed and higher central axial speed of the jet. The diffusibility of the jet flow ensured by the jet flow form enhances the shearing and tensile damage effect of the peripheral jet flow on the rock, and simultaneously overcomes the problem that the center of the rotary jet flow has a low-speed area.

(3) The fixed structure of the mixed fluid overcomes the rotary motion of the prior nozzle impeller rotating structure in the nozzle shell, thereby reducing the energy loss.

(4) The conical contact mode of the mixed fluid and the nozzle shell generates great friction force between the rotary core body and the nozzle body under the action of working pressure, and the rotary core body can be prevented from rotating in the nozzle to cause energy loss.

(5) The nozzle structure of the invention has simple structure and larger size scaling range, and is suitable for various working conditions.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a first nozzle according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the fluid mixture.

FIG. 3 is a schematic diagram illustrating the phase angle of the notch.

FIG. 4 is a schematic diagram illustrating the definition of the cut groove height difference angle.

FIG. 5 is a sectional view of a fluid mixer with three slots with negative phase angles.

FIG. 6 is a cross-sectional view of a flow mixer with five cut-in slots.

Fig. 7 shows that the central hole on the mixed flow body is a conical hole scheme.

Figure 8 shows an elliptical version of the nozzle front orifice.

Fig. 9 is a schematic structural view of a second nozzle according to an embodiment of the present invention.

Fig. 10 is a schematic view of a split fluid configuration.

Fig. 11 is a schematic diagram of a mixed flow structure of a second nozzle according to an embodiment of the present invention.

FIG. 12 is a schematic view of a mixed flow structure of a third nozzle according to an embodiment of the present invention.

The corresponding names are labeled in the figures: 1-nozzle shell, 2-mixing fluid, 3-mixing fluid seat, 4-shunting fluid, 11-front nozzle, 12-rear nozzle, 21-central hole, 22-cut groove, 23-mixing cavity, 31-fluid channel, 32-containing groove, 301-first end face of fluid seat, 221-cut groove cut inlet, 222-cut groove cut outlet and 201-first end face of mixing fluid.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Examples

The embodiment of the invention provides a cut-in type direct-rotation mixed jet flow self-propelled nozzle. Referring to fig. 1-4, the nozzle is composed of a fluid mixture 2, a fluid mixture seat 3, and a nozzle housing 1. The mixing fluid 2 is provided with a central bore 21, a mixing chamber 23 and four cut-in slots 22. The central hole 21 is used for forming a straight jet flow in the mixed flow cavity 23, and the cut-in groove 22 forms a rotating jet flow in the mixed flow cavity 23. The nozzle also comprises a mixed flow body seat 3, and a containing groove 32 and a fluid channel 31 are arranged on the mixed flow body seat 3. The nozzle also comprises a nozzle shell 1, and a rear nozzle 11 and a front nozzle 12 are arranged on the nozzle shell 1. The mixed fluid 2, the mixed fluid seat 3 and the nozzle shell 1 are fixedly connected in an interference fit mode.

In this example, the inlet 221 and the outlet 222 of the inlet groove 22 are both rectangular, and the size of the outlet 222 is smaller than that of the inlet 221, so that the liquid passing through the inlet groove 22 can be accelerated, and the height difference angle δ between the centroid of the inlet 221 and the centroid of the outlet 222 of the inlet groove 22 is zero. The shape of the

incisions

221 and 222 may also be circular (see fig. 4), semi-circular, elliptical, rectangular, diamond shaped, or a combination thereof, as is well known to those skilled in the art.

The working principle of the nozzle of the invention is as follows:

the liquid entering the nozzle has two functions, wherein one part of the liquid provides forward propelling force for the nozzle through the jet flow generated by the rear nozzle 11 on the shell 1, the other part of the liquid enters the mixed flow cavity 23 of the mixed fluid 2, and the jet flow generated by the front nozzle 12 of the nozzle is mainly used for crushing rocks. Referring to fig. 2, the liquid entering the mixing chamber 23 has two passages, one enters the mixing chamber through the central hole 21 above the first end surface 201 of the mixing fluid 2, and the other enters the mixing chamber 23 through the cut-in groove 22. Due to the phase angle difference between the cut-in port 221 and the cut-out port 222, the fluid is converted into a high-speed rotating jet flow through the cut-in slot 22, the fluid passing through the central hole 21 forms a high-speed straight jet flow, and under the narrowing action of the contraction section of the fluid channel 31 passing through the mixed fluid seat 3, the two jet flows form an enhanced straight-rotation mixed jet flow and are ejected through the front nozzle 12. The direct-rotating mixed high-speed jet beam formed by the nozzle has the characteristics of high peripheral rotating speed and high central shaft linear speed. The diffusibility of the jet flow ensured by the jet flow form enhances the shearing and tensile damage effect of the peripheral jet flow on the rock, and simultaneously overcomes the problem that the center of the rotary jet flow has a low-speed area. The nozzle structure and the principle of forming the direct-rotation mixed jet are greatly different from the prior direct-rotation mixed-flow nozzle. The existing direct-rotating mixing nozzle has a vane type structure, the vane rotates the liquid, the rotated liquid is in an independent chamber and is sprayed out from an independent nozzle, the direct jet formed by the central nozzle is also sprayed out from the independent nozzle, and the two are relatively independent. The jet flow generated by the structure has good rock breaking effect in the central area and the peripheral area of the jet flow, an obvious low-speed area can exist between the two areas, and an obvious annular boss can exist in the low-speed area, so that the problems that the hole bottom is not flat and the nozzle cannot be pushed forward are caused. By adopting the internal mixed flow cavity structure, the local low-speed area of the jet flow is well solved.

It should be noted that the fixed connection between the mixer body 2 and the mixer body seat 3 may be in a special form, i.e. integrally formed (as described above) as shown in fig. 9 and 11. In this embodiment, the cut-in groove 22 on the mixed flow body 2 extends to the first end surface 201 along the central line direction of the nozzle. A flow dividing body 4 (see fig. 10) is provided at the upper end of the flow mixing body 2, and functions to divide the liquid to be introduced into the flow mixing chamber 23 into two parts, one part enters from the cut-in port 221 of the cut-in groove 22 through the groove 42 of the flow dividing body, and the other part enters from the central hole 41 of the flow dividing body 4. Such a structure scheme is convenient for the processing of the spiral cut-in groove 22, and has firm structure and longer service life.

The special description is that:

in this example, the number of the cut-in grooves 22 is 4, and preferably, the number of the cut-in grooves 22 is 3 (see fig. 5) or 5 (see fig. 6); in this embodiment, the central hole 21 of the fluid mixture 2 is a cylindrical hole or a conical hole, and due to the narrowing action of the conical hole, the liquid passing through the central hole 21 can be further accelerated, so as to increase the ejection speed of the direct jet, see fig. 7; the cross-sectional shapes of the central hole 21 of the fluid mixture 2 and the front and rear nozzles of the nozzle may be semicircular, elliptical, rectangular, rhombic or a combination thereof, besides circular, and fig. 8 is a scheme in which the front nozzle 12 is elliptical; as for the improvement of the mixer body seat 3, it is easy for researchers in the field to think that the mixer body seat 3 is provided with a boss extending from the first end surface 301 of the mixer body seat 3, the outer contour of the boss is matched with the front nozzle 12 on the nozzle shell, and the front nozzle 12 does not play a role of a jet nozzle, please refer to fig. 12; the material of the nozzle housing 1 may be steel or cemented carbide. The material of the fluid mixture 2 and the fluid mixture seat 3 can be steel, hard alloy and composite material for reinforcing the diamond surface.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cut-in type direct-rotation mixing jet flow self-advancing nozzle is characterized in that: the mixing device comprises a mixing fluid, wherein a mixing cavity, a central hole communicated with the mixing cavity and at least two cut-in grooves communicated with the mixing cavity are formed in the mixing fluid; the central hole is used for forming liquid direct current in the mixing cavity, and the cut-in groove is used for forming liquid rotational flow in the mixing cavity.

2. The plunge straight mixing jet self-advancing nozzle of claim 1, wherein: the mixer also comprises a mixer base, wherein the mixer base is provided with a fluid channel for ejecting liquid in the mixing cavity; the mixed fluid is fixedly connected in the mixed fluid seat, or the mixed fluid and the mixed fluid seat are integrally formed.

3. The plunge straight mixing jet self-advancing nozzle of claim 2, wherein: the mixed fluid seat is provided with a containing groove, and the mixed fluid is fixedly connected with the mixed fluid seat through the containing groove.

4. The plunge straight mixing jet self-advancing nozzle of claim 2, wherein: the nozzle shell is internally communicated with the flow mixing cavity through a central hole and a cut-in groove; the nozzle shell is provided with a rear nozzle, and the mixed flow body seat is fixedly connected in the nozzle shell.

5. The plunge straight mixing jet self-advancing nozzle of claim 4, wherein: the nozzle shell is further provided with a front nozzle, the front nozzle is arranged on the side wall of the nozzle shell, and the front nozzle is used for communicating the inner space of the nozzle shell with the outer space of the nozzle shell.

6. The plunge straight mixing jet self-advancing nozzle according to any one of claims 2 to 5, wherein: the value range of a phase included angle epsilon between the entry and the exit of the entry slot is more than 0 degree and less than or equal to 90 degrees.

7. The plunge straight mixing jet self-advancing nozzle according to any one of claims 2 to 5, wherein: the value range of a height difference angle delta between the cutting inlet and the cutting outlet of the cutting groove is more than or equal to 0 degree and less than or equal to 75 degrees.

8. The plunge straight mixing jet self-advancing nozzle of claim 1, wherein: the number of the cut-in grooves is 3, 4 or 5.

9. The plunge straight mixing jet self-advancing nozzle of claim 1, wherein: the space form of the cut-in groove comprises a linear type, a circular arc type, an elliptical type, a spiral type or a combination of the linear type, the circular arc type, the elliptical type and the spiral type.

10. The plunge straight mixing jet self-advancing nozzle of claim 1, wherein: the mixed fluid cavity and the cut-in groove of the mixed fluid are arranged on the first end face of the mixed fluid and extend to the first end face of the mixed fluid in the axis direction of the nozzle, and the split fluid is arranged on the first end face of the mixed fluid.