CN206280059U - Fluid erosion prevention exempts from sand card fracturing sliding bush - Google Patents

Abstract

The utility model provides a kind of fluid erosion prevention and exempts from sand card fracturing sliding bush, and it can be connected and in sleeve pipe with oil pipe, and it includes：Shell body, its upper end is connected with top connection, and its lower end is connected with outer barrel of closing the door, and the circumference of the outer barrel of closing the door is provided with multiple perforates, mobile in the shell body to be provided with piston cylinder；Sandblasting main body, its upper end is arranged between the shell body and the piston cylinder, its lower end is connected with lower contact, nozzle is embedded with the sandblasting main body, the nozzle is provided with the spray orifice of multiple bell mouth shapes along its circumferencial direction, the spray orifice corresponding with the perforate can be connected, and the sliding sleeve for sealing the spray orifice, the sliding sleeve and being connected that the lower contact can be dismantled are provided with the inside of the sandblasting main body.The utility model can reduce the damage to sleeve pipe in fracturing process, it is to avoid occur sand card during upper lifting pipe post, backwash thoroughly, pressure break efficiency high.

Description

Fluid erosion prevention exempts from sand card fracturing sliding bush

Technical field

The utility model is related to oil, natural gas extraction technical field, is a kind of fracturing tool, and specifically one kind is applied to The fluid erosion prevention that pressure break exploitation oil gas etc. is carried out from straight well, high angle hole or horizontal well exempts from sand card fracturing sliding bush.

Background technology

In oil exploitation, for abnormal high temperature high pressure low porosity and low permeability reservoir, its producing well is with high angle hole, horizontal well etc. Based on well type, staged fracturing must be carried out before operation, wherein being generally mechanical staged fracturing, the pressure break in casing cementing Mode can improve the flow conductivity of reservoir, increase the injection rate of exploitation well yield or injection well, but, it there is also simultaneously Following deficiency：

In pressing crack construction, by the mandatory section construction of fracturing packer, after pressure break completes an interval, pitching is skidded and is covered, Carry out the pressing crack construction of next interval, if construction interval is more, under just many, the upper packer degree of extension repeatedly that enters packer Many, packer performance and sealing effectiveness are just affected, and easily cause pressure break to fail；Meanwhile, the complete rear closing well open flow of pressure break, because of well Mouth pressure is low, and strata pressure is high, can inevitably take partial open sand when liquid stream is from stratum to well head out of so that upper lifting pipe post When easily there is sand card, cause overhaul accident, intractability is big, and the cycle is long, and personnel labor intensity is big, and security is poor.

Meanwhile, in pressing crack construction, inevitably damaged adding the sand stage to be produced to sleeve pipe, it is mainly shown as following Two aspects：1st, the haydite in load fluid in the presence of inertia, causes to rush casing wall because high speed is by sand jet outlet Hit, this is the primary failure mode of casing wall；2nd, turbulent flow, the turbulent flow produced around sand jet outlet, causes haydite to the plough of casing wall Cutting, making internal surface of sleeve pipe just to there is the peeling on microcosmic around sand jet outlet.

Furthermore, after the completion of pressure break, the fracturing sand for generally being cleaned using the method for anti-flushing well in tubing string and oil jacket annular space, Backwash liquor is injected from top to bottom by annular space to be cleaned, but, due to multistage pressure break after, the sand jet outlet of each fracturing section is Open, backwash liquor can enter oil pipe from the sand jet outlet of fracturing section above so that therefore backwash liquor can take a shortcut, and make Fracturing sand in underlying fracturing section cannot be cleaned, and increased the probability of sand card.

In view of the problem that above-mentioned prior art is present, the present inventor combines the design for many years of related manufacture field and uses Experience, there is provided a kind of fluid erosion prevention exempts from sand card fracturing sliding bush to overcome drawbacks described above.

Utility model content

The purpose of this utility model is to provide a kind of fluid erosion prevention and exempts from sand card fracturing sliding bush, to overcome above-mentioned existing fracturing tool The defect of presence, the damage in reduction fracturing process to sleeve pipe, it is to avoid occur sand card during upper lifting pipe post, thoroughly, pressure break is imitated for backwash Rate is high.

Above-mentioned purpose of the present utility model can be realized using following technical proposal：

The utility model provides a kind of fluid erosion prevention and exempts from sand card fracturing sliding bush, and the fluid erosion prevention exempts from sand card fracturing sliding bush can be with oil Pipe is connected and in sleeve pipe, and it includes：Shell body, its upper end is connected with top connection, and its lower end is connected with outer barrel of closing the door, described The circumference of outer barrel of closing the door is provided with multiple perforates, mobile in the shell body to be provided with piston cylinder；Sandblasting main body, its upper end card Between the shell body and the piston cylinder, its lower end is connected with lower contact, is embedded with nozzle in the sandblasting main body, institute The spray orifice that nozzle is provided with multiple bell mouth shapes along its circumferencial direction is stated, the spray orifice can connection corresponding with the perforate, the spray The sliding sleeve for sealing the spray orifice, the sliding sleeve and being connected that the lower contact can be dismantled are provided with the inside of sand main body.

In a preferred embodiment, its circumferencial direction of the upper end edge of the piston cylinder is provided with multiple laser slotteds, described The outer wall projection outer lug boss of piston cylinder, the outer lug boss is located at the lower end of the laser slotted, the outer lug boss of the piston cylinder, institute State to be enclosed between the inwall of shell body and the top connection and set to form pressure chamber, the pressure chamber can be by multiple laser slotteds It is connected with the oil pipe.

In a preferred embodiment, the inwall of the shell body is provided with the first inner convex platform and the second convex from top to bottom Platform, encloses between first inner convex platform, second inner convex platform and the outer wall of the piston cylinder and sets to form accommodating chamber, the receiving Chamber internal pressure is provided with spring.

In a preferred embodiment, the outer wall of the sandblasting main body is provided with groove, and interval wears the on the shell body The end of the inwall that two shear pins and the 3rd shear pin, second shear pin and the 3rd shear pin pass the shell body is blocked set respectively Top and bottom in the groove.

In a preferred embodiment, it is upper carry the shell body cut second shear pin, the 3rd shear pin position In the state of the upper end in the groove, the perforate is separated with the spray orifice, and the outer barrel of closing the door seals the spray orifice； Carried in the state of the shell body makes second shear pin and the 3rd shear pin cut upper, the sandblasting main body with it is described Shell body and the piston cylinder are separated.

In a preferred embodiment, the internal diameter of the sliding sleeve less than the piston cylinder internal diameter, the sliding sleeve with it is described Lower contact is connected by the 4th shear pin, described in the state of pitching builds the pressure and cuts the 4th shear pin on to the sliding sleeve Sliding sleeve is separated with the spray orifice, and the oil pipe is connected by the annular space between the spray orifice and the oil pipe and described sleeve pipe.

In a preferred embodiment, the inwall of the sandblasting main body is arranged with indent slope, the nozzle in round table-like, The upper end of the nozzle is connected to the indent slope, and the lower end of the nozzle is connected to the lower contact, the indent slope The through hole of multiple bell mouth shapes, through hole connection corresponding with the spray orifice are provided with along its circumferencial direction.

In a preferred embodiment, the spray orifice is three, and three spray orifices are equal along the circumferencial direction of the nozzle Even setting.

In a preferred embodiment, between the longitudinal center line of the longitudinal center line of the spray orifice and the sandblasting main body With an angle.

In a preferred embodiment, the spray orifice along its axial cross sectional shape be hyperbola, the spray orifice it is interior Footpath is 17mm~20mm.

The characteristics of the utility model fluid erosion prevention exempts from sand card fracturing sliding bush and advantage are：

1st, after the utility model is connected with oil pipe in sleeve pipe, outer barrel of closing the door is connected by shell body lower end, is closed the door The perforate corresponding with the spray orifice of nozzle and the through hole of sandblasting main body is opened up on outer barrel, during making fracturing sand feeding, load fluid energy Enter the annular space of oil pipe and sleeve pipe after the perforate of the spray orifice of nozzle, the through hole of sandblasting main body and outer barrel of closing the door successively from oil pipe, And then realize pressure break and plus sand, meanwhile, in backwash process, by upper lifting pipe post, the outer barrel that makes to close the door is up to seal nozzle The through hole of spray orifice and sandblasting main body, it is ensured that the pressure break in backwash liquid energy thoroughly cleaning oil pipe and casing annulus and in other each tubing strings Sand, it is to avoid backwash liquor serially causes to clean from each spray orifice, effectively prevent the sand card of tubing string, it is ensured that tubing string up-downgoing Smooth, safety and environmental protection, construction risk is low.

2nd, the utility model is uniformly arranged many by setting round table-like nozzle in sandblasting main body along the circumferencial direction of nozzle The spray orifice of individual bell mouth shape, particularly, makes spray orifice along its axial cross sectional shape in hyperbola, and make the axial centre of spray orifice There is an angle between the longitudinal center line of line and sandblasting main body, the efficiency of fracturing sand feeding is carried out in recovery well to improve, while The impact to sleeve pipe can be reduced by the load fluid of the spray orifice at a high speed, it is to avoid turbulent flow or turbulent flow are produced around spray orifice, reduced to set The plow of tube wall, reduces the damage of sleeve pipe, extends Service Life of Casing, and in work progress, can be as fracturing sand be to spray The grinding of the spray orifice of mouth, makes the pressure difference that dams at nozzle diminish, and operation pressure is reduced automatically.

3rd, the utility model is arranged between shell body and piston cylinder by making the upper end of sandblasting main body, makes fracturing process In, piston cylinder is descending, and sandblasting main body is closely arranged between shell body and piston cylinder, while by shell body and piston cylinder It is up, the second shear pin and the 3rd shear pin are cut, giving up for sandblasting main body and lower contact is realized, it is easy to operation, construction risk is low.

4th, the utility model can be supported the use with packer, rational in infrastructure, and fracturing effect is good, by the outer wall of shell body The groove of setting, is easy to the salvaging after giving up, and by the design of piston cylinder upper end laser slotted, can prevent fracturing sand from being cut from laser Exempt from the inside of each parts of sand card fracturing sliding bush at seam into fluid erosion prevention and hinder the motion of parts, used by making sliding sleeve High-strength alloy structural steel, nozzle use Hardmetal materials, sliding sleeve and nozzle is had structural strength higher, can be suitably used for The complicated high temperature and high pressure environment of underground.

Brief description of the drawings

In order to illustrate more clearly of the technical scheme in the utility model embodiment, below will be to needed for embodiment description The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings Obtain other accompanying drawings.

Fig. 1 is the half-sectional structural representation that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush；

Fig. 2-1 is the structural representation of the state of going into the well that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush；

Fig. 2-2 is the structural representation of the pitching state that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush；

Fig. 2-3 is the structural representation of the pressure break state that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush；

Fig. 2-4 exempts from sand card fracturing sliding bush for the utility model fluid erosion prevention carries out the knot of the row of returning and backwash when spray orifice is not turned off Structure schematic diagram；

Fig. 2-5 exempts from sand card fracturing sliding bush for the utility model fluid erosion prevention carries out the structure of the row of returning and backwash when spray orifice is closed Schematic diagram；

Fig. 2-6 is the structural representation of the state of giving up that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush；

Fig. 3-1 is the main structure diagram of nozzle of the present utility model；

Fig. 3-2 is the left view structural representation of nozzle of the present utility model；

Fig. 4 is the application schematic diagram that the utility model fluid erosion prevention exempts from sand card fracturing sliding bush.

Drawing reference numeral explanation：

1 top connection, 2 shell bodies, 3 first inner convex platforms, 4 second inner convex platforms, 5 piston cylinders, 6 laser slotteds, 7 outer lug boss, 8 pressures Power chamber, 9 accommodating chambers, 10 springs, 11 first shear pins, 12 sandblasting main bodys, 13 anchor flukes, 14 grooves, 15 second shear pins, 16 the 3rd cut Nail, 17 indent slopes, 18 through holes, 19 close the door outer barrel, 20 perforates, 21 nozzles, 22 spray orifices, 23 sliding sleeves, 24 lower contacts, and 25 the 4th cut Nail, 26 sealing rings, 27 sleeve pipes, 28 oil pipes, 29 safety joints, 30 sand-proof hydraulic anchors, 31 first packers, 32 second packers, 33 the 3rd packers, 34 the 4th packers, 35 times direct-injections, 36 steel balls, 37 location holes, A1 first order fluid erosion preventions exempt from sand card pressure break cunning Set, A2 second level fluid erosion prevention exempts from sand card fracturing sliding bush, and A3 third level fluid erosion preventions exempt from sand card fracturing sliding bush, D1 internal diameters, D2 internal diameters.

Specific embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of the utility model protection.

In addition to the direction pointed out of non-individual definition, the direction such as upper and lower being referred to herein is with the utility model The direction such as upper and lower in shown Fig. 1 is defined, and illustrates in this together.

As shown in Fig. 1 to Fig. 2-6, the utility model provides a kind of fluid erosion prevention and exempts from sand card fracturing sliding bush, and the fluid erosion prevention is exempted from Sand card fracturing sliding bush can be connected and in sleeve pipe 27 with oil pipe 28, and the fluid erosion prevention exempts from sand card fracturing sliding bush to be included：Shell body 2, its upper end is connected with top connection 1, and its lower end is connected with outer barrel 19 of closing the door, and the circumference for closing the door outer barrel 19 is provided with multiple and opens Hole 20, it is mobile in the shell body 2 to be provided with piston cylinder 5；Sandblasting main body 12, its upper end is arranged in the shell body 2 and institute State between piston cylinder 5, its lower end is connected with lower contact 24, nozzle 21, the edge of the nozzle 21 are embedded with the sandblasting main body 12 Its circumferencial direction is provided with the spray orifice 22 of multiple bell mouth shapes, and the spray orifice 22 can connection corresponding with the perforate 20, the sandblasting The inner side of main body 12 is provided with the sliding sleeve 23 for sealing the spray orifice 22, the sliding sleeve 23 and being connected that the lower contact 24 can be dismantled.

Specifically, as shown in figure 1, shell body 2 is substantially cylindrical, the inwall of the upper end of shell body 2 and the outer wall of lower end Connection screw thread is respectively equipped with, the lower end outer wall of top connection 1 is provided with connection screw thread, the inwall of the upper end of outer barrel 19 of closing the door is provided with connection Screw thread, makes between shell body 2 and top connection 1 to be connected through a screw thread and shell body 2 and outer barrel 19 of closing the door between, can also be in shell Body 2 sets trip bolt with the threaded connection place of top connection 1 and shell body 2 with the threaded connection place of outer barrel 19 of closing the door, to realize More firm connection, while the inwall of the upper end of top connection 1 is provided with connection screw thread, is beneficial to it and is connected with oil pipe 28；Close the door outer Cylinder 19 is substantially cylindrical, and multiple perforates 20 thereon are uniformly distributed along its circumferencial direction；Sandblasting main body 12 is substantially cylindrical, Its upper end is provided with anchor fluke 13, and the upper end of anchor fluke 13 has an outwardly projection, to be fastened on what is set on the inwall of shell body 2 In draw-in groove, so that anchor fluke 13 is arranged between shell body 2 and piston cylinder 5 and is closely pressed located at shell body 2 it by piston cylinder 5 On, the connection of sandblasting main body 12 and shell body 2 is realized, wherein anchor fluke 13 can be multiple strips of circumferentially spaced setting Claw, the step of outer wall projection one of sandblasting main body 12, step of sandblasting main body 12 is connected to the lower end of shell body 2 and makes sandblasting Outer wall below the step of main body 12 is posted by the inwall of outer barrel 19 of closing the door, and nozzle 21 is made up of Hardmetal materials, nozzle 21 On the spray orifice 22 of bell mouth shape can make to flow through its load fluid and produce the pressure difference that dams, sliding sleeve 23 can be by high-strength alloy structural steel It is made, the working environment severe to meet high pressure, high hydrogen sulfide etc., sliding sleeve 23 is close to the inwall of the sandblasting main body 12, institute The inwall of nozzle 21 and the inwall of the lower contact 24 are stated, to seal the spray orifice 22 of the nozzle 21.

Further, as shown in figure 1, the upper end edge of the piston cylinder 5 its circumferencial direction is provided with multiple laser slotteds 6, institute The outer wall projection outer lug boss 7 of piston cylinder 5 is stated, the outer lug boss 7 is located at the lower end of the laser slotted 6, outside the piston cylinder 5 Enclosed between boss 7, the inwall of the shell body 2 and the top connection 1 and set to form pressure chamber 8, the pressure chamber 8 can be by multiple The laser slotted 6 is connected with the oil pipe 28, specifically, laser slotted 6 is the circumference in piston cylinder 5 by laser technology The a plurality of elongated gap that side is upwardly formed, its width is 0.16mm~0.18mm, and it can allow the into and out pressure of pressure fluid Power chamber 8 is so that piston cylinder 5 is moved, and fracturing sand can be prevented to enter, it is to avoid each part of pressure break sand abrasion, influences the normal of each part Work, meanwhile, outer lug boss 7 is round ring boss, and outer lug boss 7 is located at the lower section of top connection 1, is set between piston cylinder 5 and shell body 2 There is the first shear pin 11, the first shear pin 11 is located at the lower section of the outer lug boss 7, in pressure break, pressure fluid enters through laser slotted 6 presses After in power chamber 8, pressure fluid acts on piston cylinder 5 to cut the first shear pin 11 and drive piston cylinder 5 descending, under making piston cylinder 5 Portion closely compresses the anchor fluke 13 positioned at sandblasting main body 12, and in the row of returning or backwash, liquid flows to drive piston cylinder 5 from bottom to top It is up, so that the liquid in pressure chamber 8 is flowed into oil pipe 28 from laser slotted 6.

Further, as shown in figure 1, the inwall of the shell body 2 is provided with the first inner convex platform 3 and the second convex from top to bottom Platform 4, encloses between first inner convex platform 3, second inner convex platform 4 and the outer wall of the piston cylinder 5 and sets to form accommodating chamber 9, institute State the internal pressure of accommodating chamber 9 and be provided with spring 10, specifically, the first inner convex platform 3 and the second inner convex platform 4 are round ring boss, in first The level of boss 3 extends again level and extends inwardly to form the second inner convex platform 4 straight down after extending internally, make the axial direction of accommodating chamber 9 Section is in inverted L-shaped, preferably, the first inner convex platform 3 is located at the lower section of the outer lug boss 7 of piston cylinder 5, accommodating chamber 9 is by under outer lug boss 7 The outer wall of surface, the upper surface of the first inner convex platform 3, the upper surface of the second inner convex platform 4 and piston cylinder 5 encloses to set and forms, spring 10 One end is connected to the lower surface of outer lug boss 7, and the other end of spring 10 is connected to the upper surface of the second inner convex platform 4, right on shell body 2 An intercommunicating pore is provided with the lower end for answering accommodating chamber 9, accommodating chamber 9 is connected by intercommunicating pore with oil jacket annular space, is beneficial to piston cylinder 5 Move up and down, (before injection fracturing sand, namely spring 10 is in the confined state shown in Fig. 1), spring in original state 10 is interior in compressive state in accommodating chamber 9, and piston cylinder 5 is fixedly arranged on into shell body 2 by the effect of contraction of the first shear pin 11 cannot Motion, and the upper surface of the first inner convex platform 3 has the lower surface and evagination of a spacing and top connection 1 with the lower surface of outer lug boss 7 The upper surface of platform 7 also has a spacing.

Further, as shown in Fig. 1 to Fig. 2-6, the outer wall of the sandblasting main body 12 is provided with groove 14, the shell body 2 Upper interval wears the second shear pin 15 and the 3rd shear pin 16, and second shear pin 15 and the 3rd shear pin 16 pass the shell body The end of 2 inwall is arranged in the top and bottom in the groove 14 respectively, specifically, groove 14 is in cuboid, groove The lower section of 14 anchor flukes 13 for being located at the sandblasting main body 12, the second shear pin 15 and the 3rd shear pin 16 penetrate shell body 2 and convex respectively For the inwall of shell body 2 to be arranged in groove 14, the distance between the second shear pin 15 and the 3rd shear pin 16 are equal to groove 14 Length, the shearing force of the shearing force of the 3rd shear pin 16 more than or equal to the second shear pin 15.

Further, as shown in Figure 2-5, it is upper carry the shell body 2 cut second shear pin 15, the described 3rd Shear pin 16 is located in the state of the upper end in the groove 14, and the perforate 20 is separated with the spray orifice 22, described to close the door outward The sealing of cylinder 19 spray orifice 22, i.e. in upper lifting pipe post, the second shear pin 15 is first cut, and the 3rd shear pin 16 is up in groove 14, Until card is to the upper end of groove 14, now, the anchor fluke 13 of sandblasting main body 12 is still located between piston cylinder 5 and shell body 2, is closed the door Outer barrel 19 can close spray orifice 22 and through hole 18；As shown in figures 2-6, second shear pin 15 and institute are made in the upper shell body 2 that carries State in the state of the 3rd shear pin 16 cuts, the sandblasting main body 12 is separated with the shell body 2 and the piston cylinder 5, i.e. Treat that the pulling force of upper lifting pipe post continues to increase, the 3rd shear pin 16 then also cuts, the anchor fluke 13 of sandblasting main body 12 depart from piston cylinder 5 with The sandwiched of shell body 2, realizes giving up.

Further, as shown in Fig. 1 to Fig. 2-3, the internal diameter D1s of the internal diameter D2 less than the piston cylinder 5 of the sliding sleeve 23, The sliding sleeve 23 is connected with the lower contact 24 by the 4th shear pin 25, and pitching builds the pressure and makes the described 4th on to the sliding sleeve 23 Shear pin 25 cut in the state of, the sliding sleeve 23 is separated with the spray orifice 22, the oil pipe 28 by the spray orifice 22 with it is described Annular space between oil pipe 28 and described sleeve pipe 27 is connected, specifically, sliding sleeve 23 is generally cylindrical, the internal diameter D2 of sliding sleeve 23 is small In the external diameter of steel ball 36, the internal diameter D1 of the external diameter less than the piston cylinder 5 of the steel ball 36, under making the steel ball 36 in input tubing string Row is built the pressure up to the setting upper end in sliding sleeve 23 to liquid is injected in oil pipe 28, until the 4th shear pin 25 is cut, sliding sleeve 23 It is descending with steel ball 36, realize the spray orifice 22 of nozzle 21 and the connection (as Figure 2-3) of oil pipe 28.

Further, as shown in figure 1, the inwall of the sandblasting main body 12 is arranged with indent slope 17, the nozzle 21 is in Round table-like, the upper end of the nozzle 21 is connected to the indent slope 17, and the lower end of the nozzle 21 is connected to the lower contact 24, the indent slope 17 is provided with the through hole 18 of multiple bell mouth shapes, the through hole 18 and the spray orifice 22 along its circumferencial direction Correspondence connection, by nozzle 21 consolidate be arranged between sandblasting main body 12 and lower contact 24, while make the inwall of nozzle 21, under The inwall and sandblasting main body 12 of joint 24 are coplanar with the inwall that sliding sleeve 23 is fitted, it is ensured that sliding sleeve 23 is steady and sealing fits in spray On the inwall of the inwall, the inwall of lower contact 24 and sandblasting main body 12 of mouth 21, as shown in Fig. 3-1 and Fig. 3-2, the lower end of nozzle 21 Multiple location holes 37 are provided with along its circumferencial direction, to ensure that nozzle 21 is accurately positioned installation.

Preferably, as shown in Fig. 3-1 and Fig. 3-2, the spray orifice 22 is three, and three spray orifices 22 are along the nozzle 21 Circumferencial direction be uniformly arranged, while perforate 20 and through hole 18 are also three, and in a circumferential direction respectively with the phase of spray orifice 22 Correspondence, certainly, spray orifice 22, perforate 20 and through hole 18 are it can also be provided that other suitable quantity, as long as ensureing three's quantity phase Deng, and pressure break can be smoothed out, this is not restricted, it is preferred that location hole 37 is also three, three location holes 37 and three Individual spray orifice 22 is staggered in a circumferential direction.

In one embodiment, have between the longitudinal center line of the longitudinal center line of the spray orifice 22 and the sandblasting main body 12 Have an angle, to alleviate impact of the load fluid of high speed to sleeve pipe 27, it is to avoid the load fluid of high speed under effect of inertia it is vertical to Sleeve pipe 27 is impacted, and reduces damage and plow to sleeve pipe 27, extends the service life of sleeve pipe 27, preferably, the angle is 60 Degree (that is, making the longitudinal center line of spray orifice 22 on the basis of the longitudinal center line of sandblasting main body 12, makes spray orifice 22 upward Turn over 30 degree), the fracturing effect of load fluid had both been ensure that, it also avoid the impact to sleeve pipe 27.Preferably, the spray orifice 22 is along it The cross sectional shape of axial direction is hyperbola, is conducive to load fluid to produce the impulsive force of the pressure difference that dams, load fluid to become after spray orifice 22 Small, flow velocity slows down, and reduces impact of the load fluid to sleeve pipe 27, protects sleeve pipe 27, and the internal diameter of the spray orifice 22 is 17mm~20mm, I.e. the internal diameter of the spray orifice 22 of toroidal is within the range.

In one embodiment, between the top connection 1 and the shell body 2, the shell body 2 and the piston cylinder 5 Between outer lug boss 7, between the piston cylinder 5 and the sandblasting main body 12, between the sliding sleeve 23 and the sandblasting main body 12, institute State between sliding sleeve 23 and the lower contact 24 and be respectively equipped with sealing ring 26 and the lower contact 24 and the sandblasting main body 12 between, To realize the sealing between part two-by-two, a sealing ring 26 can be set between the part that wherein each two connects, it is also possible to Two sealing rings 26 are set, and this is not restricted.

The operation principle for exempting from sand card fracturing sliding bush to the utility model fluid erosion prevention below is illustrated：

First, it is connected with the grade tubing string of oil pipe 28 by its top connection 1 or lower contact 24, is placed in sleeve pipe 27, in pressure break Before beginning (namely original state), as shown in Fig. 2-1, sliding sleeve 23 is fixedly arranged in sandblasting main body 12 and is closed by the 4th shear pin 25 The spray orifice 22 of nozzle 21, piston cylinder 5 is fixedly arranged in shell body 2 by its own resilient of the first shear pin 11 and spring 10, then, to Input steel ball 36 in oil pipe 28, steel ball 36 falls the setting upper end in sliding sleeve 23, as shown in Fig. 2-2, is pressed to being injected in oil pipe 28 Power liquid, the pressure of liquid acts on steel ball 36 cuts the 4th shear pin 25, and steel ball 36 and sliding sleeve 23 leave behind together, such as Fig. 2-3 It is shown, then, start pressing crack construction, to fracturing fluid is injected in oil pipe 28, fracturing fluid enters shell body 2 and piston along oil pipe 28 The inner chamber of cylinder 5, and successively along the spray orifice 22 on nozzle 21, the through hole 18 in sandblasting main body 12 and the perforate 20 closed the door on outer barrel 19 Into oil pipe 28 and the annular space of sleeve pipe 27, entering back into oil-gas Layer carries out pressure break, and at the same time, sub-fraction pressure fluid also can be suitable Laser slotted 6 into pressure chamber 8 and the outer lug boss 7 of piston cylinder 5 is acted on, to cut the first shear pin 11 and promote piston cylinder 5 Descending, the spring 10 in accommodating chamber 9 continues to be compressed, and the lower surface of the outer lug boss 7 of piston cylinder 5 is connected to the first of shell body 2 On inner convex platform 3, the anchor fluke 13 of the lower enforcement sandblasting main body 12 of piston cylinder 5 is more closely erected on the inwall of shell body 2, until this (this section of pressing crack construction is completed the completion of section pressing crack construction, still has pressure in oil pipe 28, and piston cylinder 5 is still within position shown in Fig. 2-3 Put)；

As in Figure 2-4, after the completion of this well whole pressure break, counter to be arranged (discharge fracturing fluid) or anti-flushing well, it can So that fracturing fluid or backwash liquor are entered after perforate 20, through hole 18 and spray orifice 22 successively by the annular space between oil pipe 28 and sleeve pipe 27 Oil pipe 28, returns to ground, or, ground, now, the meeting of piston cylinder 5 are directly returned to by the annular space between oil pipe 28 and sleeve pipe 27 It is up in the presence of the elastic force and fracturing fluid of spring 10 or the driving force of backwash liquor, and by the liquid in pressure chamber 8 through laser Slot 6 is discharged, until the upper end of piston cylinder 5 be connected to top connection 1 lower end (spring 10 now still in compressive state, therefore, The elastic force of spring 10 can make piston cylinder 5 be closely against the lower end of top connection 1), it is same with this untill the liquid in pressure chamber 8 is arranged light When, piston cylinder 5 is still pressed in sandblasting main body 12；

As shown in Figure 2-5, when needing to propose to there is more fracturing sand in tubing string and tubing string, or, for the He of oil pipe 28 When there is more fracturing sand in the annular space between sleeve pipe 27 and causing anti-row or not smooth backwash, can it is upper carry oil pipe 28 after enter again Row backwash：Oil pipe 28 is above carried, makes shell body 2 in the presence of upper lifting power, cut up, the 3rd shear pin 16 after the second shear pin 15 It is then up in groove 14, until the 3rd shear pin 16 is arranged in the upper end of the groove 14 of sandblasting main body 12, the anchor of sandblasting main body 12 Pawl 13 is still located between shell body 2 and piston cylinder 5, and now, outer barrel 19 of closing the door closes the through hole 18 just, and backwash liquor can be along oil Annular space between pipe 28 and sleeve pipe 27 returns up ground, realizes thoroughly cleaning, it is to avoid backwash liquor enters oil pipe 28 from spray orifice 22 Inside take a shortcut and cause cleaning not thorough or cannot clean；

When anti-row or anti-flushing well propose tubing string after terminating, tubing string proposition cannot be still completed such as card, part can be carried out and given up： As shown in figures 2-6, oil pipe 28 is carried in continuation, is made shell body 2 up and is cut the 3rd shear pin 16, realize sandblasting main body 12 and shell The separation of body 2, makes sandblasting main body 12 be left behind together with nozzle 21 and lower contact 24, and now piston cylinder 5 also can be in the bullet of spring 10 The lower end of top connection 1 is resisted against under power effect.

The utility model fluid erosion prevention exempts from sand card fracturing sliding bush using advanced, practical design concept, can have simultaneously to oil Gas-bearing formation carries out sandblasting pressure break, reduces casing damage, realize thoroughly cleaning by closing spray orifice, give up and be easy to propose that tubing string etc. is excellent Point, it can be used to exploit oil reservoir, gas reservoir, solable matter or solubilized material or slurry of mineral, and it is a kind of rational in infrastructure, suitable Answer that adverse circumstances, safety and environmental protection, selling price are low, fracturing effect is good, pressure break efficiency high, oil can be exploited in the oil-gas Layer of underground With the fracturing tool of natural gas, because the spray orifice 22 of toroidal thereon has micro- effect dammed, micro- damming can be named as First generation fluid erosion prevention exempts from sand card fracturing sliding bush (i.e. WJL-01 types fluid erosion prevention exempts from sand card fracturing sliding bush), and it when in use can be in oil pipe Multiple fluid erosion preventions of being connected on 28 exempt from sand card fracturing sliding bush, for example, can up and down couple 1~5 fluid erosion prevention of the present utility model and exempt from sand card Fracturing sliding bush, and fluid erosion prevention per one-level exempts from that sand card fracturing sliding bush can instrument be supporting makes with packer, hydraulic anchor, safety joint etc. With, with pressure break efficiency high, good fracturing effect, easy construction, automatically reduce operation pressure (i.e. during fracturing sand feeding, nozzle 21 is big by mill, under the pressure difference that dams becomes so that pressure reduction) the features such as, to better illustrate use of the utility model in underground, It is following be described with a specific embodiment (wherein, packer can for K341 well known in the prior art, K344, Y341, The packers such as Y344, and K represents expanding, Y and represents that compression, first digit 3 are represented without support, second digit 4 represents Fluid power is setting, third digit represents deblocking mode)：

It is as shown in Figure 4 that four fracturing packers and three fluid erosion preventions of the present utility model exempt from sand card fracturing sliding bush simultaneously The structure chart of the fracturing strings being connected to form with oil pipe 28, the lower end of oil pipe 28 is sequentially connected safety joint 29 and sand control waterpower Anchor 30, the lower end of sand-proof hydraulic anchor 30 by oil pipe 28 be sequentially connected the 4th fracturing section, the 3rd fracturing section, the second fracturing section and First fracturing section, wherein, the first fracturing section includes lower direct-injection 35, is threadedly connected to the first packer 31 of the upper end of lower direct-injection 35, Second fracturing section includes that the first order fluid erosion prevention for being threaded in the upper end of the first packer 31 is exempted from sand card fracturing sliding bush A1, screw thread and connected The oil pipe 28 that first order fluid erosion prevention is exempted from sand card fracturing sliding bush A1 and the second packer 32 being connected on the oil pipe 28 are connected on, the Three fracturing sections include that the second level fluid erosion prevention for being threaded in the upper end of the second packer 32 exempts from sand card fracturing sliding bush A2, threaded connection Exempt from the oil pipe 28 on sand card fracturing sliding bush A2 and the 3rd packer 33 being connected on the oil pipe 28, the 4th in second level fluid erosion prevention Fracturing section includes that the third level fluid erosion prevention for being threaded in the upper end of the 3rd packer 33 is exempted from sand card fracturing sliding bush A3, is threaded in Third level fluid erosion prevention exempts from the oil pipe 28 on sand card fracturing sliding bush A3 and the 4th packer 34 being connected on the oil pipe 28, wherein, The internal diameter that second level fluid erosion prevention exempts from the sliding sleeve 23 in sand card fracturing sliding bush A2 exempts from sand card fracturing sliding bush A1 more than first order fluid erosion prevention The internal diameter of interior sliding sleeve 23 and exempt from the internal diameter of the sliding sleeve 23 in sand card fracturing sliding bush A3 less than third level fluid erosion prevention, with realize from The priority pressure break of the different fracturing sections on down；Exempting from sand card fracturing sliding bush because of fluid erosion prevention of the present utility model has sandblasting and safety The effect of connection, so (namely between packer adjacent two-by-two) no longer sets safety joint in each fracturing section, and only One safety joint 29 is set in the top of the 4th fracturing section of the top, certainly, according to actual production and technological requirement, also may be used With between packer adjacent two-by-two, safety joint is set；

In construction, after under fracturing string in place, the pressing crack construction of the first fracturing section is directly carried out, treat the first fracturing section After the completion of construction, the first steel ball of input destroys the sliding sleeve 23 that first order fluid erosion prevention is exempted from sand card fracturing sliding bush A1, the first steel ball and First order fluid erosion prevention exempts from the descending setting spout in lower direct-injection 35 of sliding sleeve 23 in sand card fracturing sliding bush A1, to ensure the second pressure break The pressing crack construction of section；Then, the pressing crack construction of the second fracturing section is carried out, is treated after the completion of the construction of the second fracturing section, put into the second steel Ball destroys the sliding sleeve 23 that second level fluid erosion prevention is exempted from sand card fracturing sliding bush A2, and the second steel ball and second level fluid erosion prevention exempt from sand card pressure break Sliding sleeve 23 in sliding sleeve A2 is descending setting on the oil pipe 28 of the lower end of the second packer 32, is applied with the pressure break for ensureing the 3rd fracturing section Work；Then, the pressing crack construction of the 3rd fracturing section is carried out, is treated after the completion of the construction of the 3rd fracturing section, the 3rd steel ball of input destroys the 3rd Level fluid erosion prevention exempts from the sliding sleeve 23 in sand card fracturing sliding bush A3, and the 3rd steel ball and third level fluid erosion prevention are exempted from sand card fracturing sliding bush A3 Sliding sleeve 23 is descending setting on the oil pipe 28 of the lower end of the 3rd packer 33, to ensure the pressing crack construction of the 4th fracturing section；Followed by, The pressing crack construction of the 4th fracturing section is carried out, after the completion for the treatment of pressing crack construction, each packer is in unset state (wherein packer Structure is existing structure, and sealing is realized when having fracturing fluid in tubing string, realizes that pressure release is unsealed after pressure break is completed), the row of returning is carried out, After the completion of the row of returning, the fracturing sand cleaned in oil jacket annular space and oil pipe by anti-flushing well, and tubing string is proposed, and sand card such as being run into, can carry The tonnage that tubing string high is above carried, the spray orifice 22 for making the fluid erosion preventions at different levels above stuck point exempt from sand card fracturing sliding bush is closed, and is carried out again anti- Well-flushing, to wash the fracturing sand of stuck point, contributes to tubing string to go out from well, such as runs into that sand is buried or tubing string still cannot rise out, Can continue to improve the tonnage that tubing string is above carried, until the tubing string fluid erosion prevention nearest from stuck point top exempts from sand Ka Yaliehuataochu taking off Open, tubing string above can smoothly rise out, Special fishing tool is entered under then passing through again and salvages following tubing string.

The characteristics of the utility model fluid erosion prevention exempts from sand card fracturing sliding bush and advantage are：

1st, after the utility model is connected with oil pipe 28 in sleeve pipe 27, outer barrel of closing the door is connected by the lower end of shell body 2 19, the perforate 20 corresponding with the spray orifice 22 of nozzle 21 and the through hole 18 of sandblasting main body 12 is opened up on outer barrel 19 of closing the door, make pressure break Plus during sand, load fluid can be from oil pipe 28 successively through the spray orifice 22 of nozzle 21, the through hole 18 of sandblasting main body 12 and outer barrel of closing the door Enter the annular space of oil pipe 28 and sleeve pipe 27 after 19 perforate 20, and then realize pressure break and add sand, meanwhile, in backwash process, lead to Upper lifting pipe post is crossed, the through hole 18 of the up spray orifice 22 and sandblasting main body 12 to seal nozzle 21 of outer barrel 19 that make to close the door, it is ensured that backwash Fracturing sand in liquid energy thoroughly cleaning oil pipe 28 and the annular space of sleeve pipe 27 and in other each tubing strings, it is to avoid backwash liquor is gone here and there from each spray orifice 22 Go and cause to clean, effectively prevent the sand card of tubing string, it is ensured that smooth, the safety and environmental protection of tubing string up-downgoing, construction risk It is low.

2nd, the utility model is uniform by setting round table-like nozzle 21, the circumferencial direction along nozzle 21 in sandblasting main body 12 The spray orifice 22 of multiple bell mouth shapes is set, particularly, makes spray orifice 22 along its axial cross sectional shape in hyperbola, and make spray orifice There is an angle between 22 longitudinal center line and the longitudinal center line of sandblasting main body 12, carry out pressure break in recovery well and add to improve The efficiency of sand, while the impact to sleeve pipe 27 can be reduced by the load fluid of the spray orifice 22 at a high speed, it is to avoid the surrounding of spray orifice 22 is produced Turbulent flow or turbulent flow, reduce the plow to casing wall, reduce the damage of sleeve pipe 27, extend the service life of sleeve pipe 27, and in construction During, grinding that can be with fracturing sand to the spray orifice 22 of nozzle 21 makes the pressure difference that dams at nozzle 21 diminish, and automatic reduction is applied Work pressure.

3rd, the utility model is arranged between shell body 2 and piston cylinder 5 by making the upper end of sandblasting main body 12, makes pressure break mistake Cheng Zhong, piston cylinder 5 is descending, and sandblasting main body 12 is closely arranged between shell body 2 and piston cylinder 5, while passing through the He of shell body 2 Piston cylinder 5 it is up, cut the second shear pin 15 and the 3rd shear pin 16, realize giving up for sandblasting main body 12 and lower contact 24, be easy to Operation, construction risk is low.

4th, the utility model can be supported the use with packer, rational in infrastructure, and fracturing effect is good, by the outer wall of shell body 2 The groove 14 of upper setting, is easy to the salvaging after giving up, by the design of the upper end laser slotted 6 of piston cylinder 5, can prevent fracturing sand from Exempt from the inside of each parts of sand card fracturing sliding bush at laser slotted 6 into fluid erosion prevention and hinder the motion of parts, by making Sliding sleeve 23 uses Hardmetal materials using high-strength alloy structural steel, nozzle 21, sliding sleeve 23 and nozzle 21 is had higher Structural strength, can be suitably used for the complicated high temperature and high pressure environment of underground.

The above is only preferred embodiment of the present utility model, not does any formal to the utility model Limitation, although the utility model is stated as above with preferred embodiment, but is not limited to the utility model, it is any affiliated Have usually intellectual in technical field, do not departing from the range of technical solutions of the utility model, when using the disclosure above Technology contents make it is a little change or be modified to the Equivalent embodiments of equivalent variations, as long as being without departing from the utility model technology The content of scheme, any simple modification made to above example according to technical spirit of the present utility model, equivalent variations with Modification, still falls within the range of technical solutions of the utility model.

Claims (10)

1. a kind of fluid erosion prevention exempts from sand card fracturing sliding bush, it is characterised in that the fluid erosion prevention exempts from sand card fracturing sliding bush can be with oil pipe phase Even and in sleeve pipe, the fluid erosion prevention exempts from sand card fracturing sliding bush to be included：

Shell body, its upper end is connected with top connection, and its lower end is connected with outer barrel of closing the door, and the circumference of the outer barrel of closing the door is provided with many Individual perforate, it is mobile in the shell body to be provided with piston cylinder；

Sandblasting main body, its upper end is arranged between the shell body and the piston cylinder, and its lower end is connected with lower contact, the spray Nozzle is embedded with sand main body, the nozzle is provided with the spray orifice of multiple bell mouth shapes along its circumferencial direction, and the spray orifice can be with institute State perforate correspondence to connect, the sliding sleeve for sealing the spray orifice, the sliding sleeve and the lower contact are provided with the inside of the sandblasting main body What can be dismantled is connected.

2. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the upper end edge of the piston cylinder its Circumferencial direction is provided with multiple laser slotteds, and the outer wall projection outer lug boss of the piston cylinder, the outer lug boss is cut positioned at the laser The lower end of seam, encloses between the outer lug boss of the piston cylinder, the inwall of the shell body and the top connection and sets to form pressure chamber, institute Stating pressure chamber can be connected by multiple laser slotteds with the oil pipe.

3. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the inwall of the shell body is from upper And the first inner convex platform and the second inner convex platform are had, outside first inner convex platform, second inner convex platform and the piston cylinder Enclosed between wall and set to form accommodating chamber, the accommodating chamber internal pressure is provided with spring.

4. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the outer wall of the sandblasting main body sets Fluted, interval wears the second shear pin and the 3rd shear pin on the shell body, and second shear pin and the 3rd shear pin are passed The end of the inwall of the shell body is arranged in the top and bottom in the groove respectively.

5. fluid erosion prevention according to claim 4 exempts from sand card fracturing sliding bush, it is characterised in that carries the shell body and makes institute upper State that the second shear pin is cut, the 3rd shear pin is located in the state of the upper end in the groove, the perforate and the spray orifice phase Separate, the outer barrel of closing the door seals the spray orifice；Carry the shell body and make second shear pin and the 3rd shear pin equal upper In the state of cutting, the sandblasting main body is separated with the shell body and the piston cylinder.

6. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the internal diameter of the sliding sleeve is less than institute The internal diameter of piston cylinder is stated, the sliding sleeve is connected with the lower contact by the 4th shear pin, pitching builds the pressure and makes on to the sliding sleeve In the state of 4th shear pin is cut, the sliding sleeve is separated with the spray orifice, and the oil pipe passes through the spray orifice and the oil Annular space between pipe and described sleeve pipe is connected.

7. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the inwall of the sandblasting main body is recessed Indent slope is provided with, the nozzle is in round table-like, and the upper end of the nozzle is connected to the indent slope, the lower end of the nozzle The lower contact is connected to, the indent slope is provided with the through hole of multiple bell mouth shapes, the through hole and institute along its circumferencial direction Spray orifice correspondence is stated to connect.

8. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the spray orifice is three, three The spray orifice is uniformly arranged along the circumferencial direction of the nozzle.

9. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the longitudinal center line of the spray orifice There is an angle and the longitudinal center line of the sandblasting main body between.

10. fluid erosion prevention according to claim 1 exempts from sand card fracturing sliding bush, it is characterised in that the spray orifice is along its axial direction Cross sectional shape is hyperbola, and the internal diameter of the spray orifice is 17mm~20mm.