CN218407400U

CN218407400U - Vertical filtering desander

Info

Publication number: CN218407400U
Application number: CN202121720552.1U
Authority: CN
Inventors: 杨宇平; 陈虹锦; 王介; 刘磊; 陈政
Original assignee: Sichuan Huayu Petroleum Drilling And Production Equipment Co ltd
Current assignee: Sichuan Huayu Petroleum Drilling And Production Equipment Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2023-01-31
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a vertical filtering desander, which comprises a quick-opening blind plate, a sleeve, a transition sleeve, a filter element and a lower end socket; the quick-opening blind plate and the lower end enclosure are respectively arranged at the top and the bottom of the sleeve; the sleeve is internally provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the transition sleeve is fixed in the first cavity, the filter element is fixed in the second cavity, and the transition sleeve is tightly pressed at the top end of the filter element; the transition sleeve is provided with a vent hole, the filter element is provided with a plurality of filter holes, the transition sleeve with a hollow structure and the middle part of the filter element form a filter channel, and an annular air outlet cavity is arranged between the inner wall of the second cavity and the outer wall of the filter element; sealing elements are arranged at two ends of the filter element; an air inlet is formed in the side wall of the top of the sleeve, an air outlet is formed in the bottom of the sleeve, and the air outlet is communicated with the annular air outlet cavity. The utility model discloses a filter core is arranged perpendicularly, and the gas direction is from the top down, and interior business turn over is gone out, plays the effect of cleaning to the grit of filter core inner wall, is favorable to the sand grain to gather in the bottom, the row's of being convenient for sand.

Description

Vertical filtering desander

Technical Field

The utility model relates to a shale natural gas desanding equipment technical field especially relates to a vertical filtration desander.

Background

The exploited shale natural gas contains gravel, and the desander is used for desanding the shale natural gas and is positioned at the front stage of the natural gas treatment process.

The existing desander adopts a filtering structure with an outer diameter, so that in the exploitation process of shale gas, the gas pressure can be unstable or even extremely high, and when the working pressure is increased suddenly, a filter cylinder can be flattened, so that the filtering condition is damaged, the desander and downstream process equipment are damaged, and great economic loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vertical filtering desander which solves the technical problem in the prior art.

The utility model adopts the technical proposal that: the vertical filtering desander comprises a quick-opening blind plate, a sleeve, a transition sleeve, a filter element and a lower end enclosure;

the quick-opening blind plate is arranged at the top end of the sleeve, and the lower end enclosure is arranged at the bottom end of the sleeve;

the sleeve is internally provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the transition sleeve is fixed in the first cavity, the filter element is fixed in the second cavity, and the transition sleeve is tightly pressed at the top end of the filter element;

the transition sleeve is provided with a vent hole, the filter element is provided with a plurality of filter holes, the transition sleeve and the middle part of the filter element in a hollow structure form a filter channel, the filter channel is communicated with the sand storage cavity of the lower end socket, and an annular air outlet cavity is arranged between the inner wall of the second cavity and the outer wall of the filter element;

a sealing element is arranged on the side wall of the top of the filter element, and a sealing element is arranged on the side wall of the bottom of the filter element;

an air inlet is formed in the side wall of the top of the sleeve, an air outlet is formed in the side wall of the bottom of the sleeve, the air inlet is communicated with the first cavity, and the air outlet is communicated with the annular air outlet cavity;

the shale gas passes through the air inlet, the transition sleeve, the filter element, the annular air outlet cavity and the air outlet in sequence, and the sand removal of the shale gas is realized.

As a preferred mode of the vertical filtering desander, the top end of the transition sleeve is also provided with a pressing mechanism for pressing the transition sleeve and the filter element.

As a preferred mode of the vertical filtering desander, the inner wall of the top end of the sleeve is provided with internal threads, the pressing mechanism is provided with two locking nuts, and the outer walls of the two locking nuts are provided with external threads matched with the internal threads.

As an optimal mode of the vertical filtering desander, the inner wall of the top end of the sleeve is provided with internal threads, the pressing mechanism is a pressing cover and a locking nut, the vertical section of the pressing cover is in a convex shape, the locking nut is in a circular ring shape, and the outer walls of the pressing cover and the locking nut are provided with external threads matched with the internal threads.

As a preferred mode of the vertical filtering desander, a first step, a second step and a third step are sequentially arranged at the bottom of the first cavity;

the transition sleeve is provided with a plurality of vent holes, and the bottom of the transition sleeve is provided with a first annular boss; the first annular boss of the transition sleeve is positioned at the second step, an annular air inlet cavity is formed between the outer wall of the transition sleeve and the inner wall of the first cavity, and the volume of the annular air inlet cavity is increased by the first step;

a limiting ring is arranged at the top end of the filter element and is positioned at the third step; the sealing element that sets up on the lateral wall at filter core top is the first sealing washer that sets up in spacing ring and third step lateral wall department to will annular air inlet cavity with seal between the annular air outlet cavity.

As a preferable mode of the vertical filtering desander, the top of the second cavity is provided with a reducing section, and the bottom of the second cavity is sequentially provided with a fourth step and a fifth step;

the arrangement of the reducing section and the fourth step enables the annular air outlet cavity to be formed between the inner wall of the second cavity and the outer wall of the filter element;

a positioning ring is arranged at the bottom of the filter element, a second annular boss is arranged at the upper part of the positioning ring, and the second annular boss is clamped at the fifth step; the sealing element arranged on the side wall of the bottom of the filter element is a second sealing ring arranged between the positioning ring and the side wall of the fifth step.

As a preferable mode of the vertical filtering desander, the bottom of the sleeve is also provided with a backflushing port which is communicated with the annular air outlet cavity.

As a preferable mode of the vertical filtering desander, the bottom of the sleeve is also provided with a discharge port which is communicated with the annular air outlet cavity.

As a preferable mode of the vertical filtering desander, the top of the sleeve is also provided with a first differential pressure gauge port which is communicated with the annular air inlet cavity;

and a second differential pressure gauge port is also arranged at the bottom of the sleeve and communicated with the annular air outlet cavity.

As a preferred mode of the vertical filtering desander, the lower seal head is welded, connected by screw threads or integrally formed on the end surface of the bottom of the sleeve.

The utility model has the advantages that:

1. the natural gas inlet forms an annular air inlet cavity, so that the local flow speed is reduced, the gas is convoluted to form a buffer area, the scouring of sand grains to the sleeve is reduced, and the service life of the equipment is prolonged.

2. The filter core is arranged vertically, the gas direction is from top to bottom, and the gas enters and exits, so that the sand on the inner wall of the filter core is cleaned, sand grains are favorably gathered at the bottom, and the sand discharge is facilitated.

3. Different from the existing external-in and internal-out filtering structure, the gas pressure may be unstable and extreme in the exploitation process of shale gas. When the operating pressure increases dramatically, it can cause the filter cartridge to collapse, thereby disrupting the filtration conditions, damaging the desander itself, or the downstream process equipment, and causing significant economic losses.

4. The transition sleeve is positioned by the locking nut and the gland, and is reliable in compression and sealing.

Drawings

Fig. 1 is a schematic structural view of the vertical filtering desander disclosed by the utility model.

Fig. 2 is a sectional view of the vertical filtering desander of the utility model.

Fig. 3 is another cross-sectional view of the vertical filtering grit catcher of the present invention.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is an enlarged view of a portion B in fig. 3.

Reference numerals: 1. quickly opening a blind plate; 2. a sleeve; 201. an air inlet; 202. a first differential pressure gauge port; 203. a second differential pressure gauge port; 204. a discharge port; 205. back flushing the opening; 206. an air outlet; 207. a diameter-changing section; 208. a first step; 209. a second step; 210. a third step; 211. a fourth step; 212. a fifth step; 3. a transition sleeve; 301. a vent hole; 302. a first annular boss; 4. a filter element; 5. a lower end enclosure; 6. an annular air intake cavity; 7. an annular air outlet cavity; 8. a limiting ring; 801. a first seal ring; 9. a positioning ring; 901. a second seal ring; 902. a second annular boss; 10. a gland; 11. and locking the nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Referring to fig. 1-3, the utility model provides a vertical filtering desander for get rid of the gravel in the shale gas of exploitation, it includes quick-open blind plate 1, sleeve 2, transition cover 3, filter core 4, low head 5.

Specifically, the quick-opening blind plate 1 is installed at the top end of the sleeve 2, and the lower seal head 5 is installed at the bottom end of the sleeve 2. Since the quick-opening blind plate 1 is the prior art, the detailed structure thereof is not described in detail in this embodiment.

The sleeve 2 is a hollow structure, and a first cavity and a second cavity which are communicated with each other from top to bottom are formed in the sleeve. The transition sleeve 3 is fixed in the first cavity by the pressing mechanism; the filter element 4 is fixed in the second cavity, and the transition sleeve 3 is pressed on the top end of the filter element 4.

Be provided with ventilation hole 301 on the transition cover 3, be provided with a plurality of filtration pores on the filter core 4, hollow structure's transition cover 3 and 4 middle parts of filter core form and filter the passageway, filter the passageway and communicate with each other with the sand storage cavity of low head 5, have annular air outlet chamber 7 between 2 inner walls of sleeve and the 4 outer walls of filter core.

The side wall at the top of the filter element 4 is provided with a sealing element, so that the shale gas can not directly enter the annular gas outlet cavity 7, and can only enter the annular gas outlet cavity 7 through the transition sleeve 3 and the filter element 4. And a sealing element is also arranged on the side wall of the bottom of the filter element 4, so that the shale gas is prevented from leaking to the lower seal head 5.

An air inlet 201 is arranged on the side wall of the top of the sleeve 2, an air outlet 206 is arranged on the side wall of the bottom of the sleeve 2, the air inlet 201 is communicated with the first cavity, preferably, the air inlet 201 is opposite to one ventilation hole 301 on the transition sleeve 3, and the air outlet 206 is communicated with the annular air outlet cavity 7. Since the filter element 4 is vertically arranged, the gas direction is from top to bottom, in and out, so that the filter element 4 removes gravel. In addition, the gravity direction of the gravel is consistent with the gas flowing direction, so that sand accumulated on the wall of the filter element 4 is blown off by the passing gas and is accumulated in the sand storage cavity of the lower seal head 5, and the filter element 4 can work effectively for a long time.

Specifically, the top end of the transition sleeve 3 is also provided with a pressing mechanism for pressing the transition sleeve 3 and the filter element 4. In some embodiments, the pressing mechanism is two locking nuts, the inner wall of the top end of the sleeve is provided with internal threads, and the outer walls of the two locking nuts are provided with external threads matched with the internal threads on the inner wall of the top end of the sleeve. In other embodiments, referring to fig. 2, the pressing mechanism is a pressing cover 10 and a locking nut 11, the vertical section of the pressing cover 10 is in a convex shape, the locking nut 11 is in a circular ring shape, a through hole in the middle of the locking nut 11 can be sleeved on the pressing cover 10, a notch for detaching the internal hexagonal screwdriver is formed in the top end of the pressing cover 10, internal threads are formed on the inner wall of the top end of the sleeve 2, and external threads matched with the internal threads on the inner wall of the top end of the sleeve 2 are formed on the outer walls of the pressing cover 10 and the locking nut 11. This kind of pressing mechanism of gland 10 and lock nut 11 has the following advantage compared with the pressing mechanism of two lock nuts, and two lock nuts need to take out the lock nut after dismantling above earlier and then dismantle the lock nut below when dismantling, take out the lock nut below again finally, and this in-process has shared twice lock nut. The mode of the gland 10 and the locking nut 11 firstly detaches the locking nut 11, then detaches the gland and finally lifts the gland 10 out, the gland 10 is taken out once, and the mode of taking out is more convenient compared with the mode of taking out.

Referring to fig. 4, the bottom of the first cavity is sequentially provided with a first step 208, a second step 209 and a third step 210.

Referring to fig. 4, a plurality of vent holes 301 are formed in the transition sleeve 3, and a first annular boss 302 is formed at the bottom of the transition sleeve 3; the first annular boss 302 of the transition sleeve 3 is located at the second step 209, an annular air inlet cavity 6 is formed between the outer wall of the transition sleeve 3 and the inner wall of the first cavity, and the first step 208 increases the volume of the annular air inlet cavity 6. The shale gas forms the annular air inlet cavity 6 at the air inlet 201, reduces the local flow velocity, and makes the gas convolute to form the buffer zone, reduces the scouring of sand to the inner wall of the sleeve 2, and prolongs the service life of the equipment.

Referring to fig. 4, the top end of the filter element 4 is provided with a limiting ring 8, the limiting ring 8 is located at the third step 210, the limiting ring 8 and the side wall of the third step 210 are further provided with a first sealing ring 801, which seals the annular air inlet cavity 6 and the annular air outlet cavity 7, so that the shale gas can only enter the transition sleeve 3 from the air inlet 201, then enter the filtering channel downwards, then exit from the filtering hole of the filter element 4 to the annular air outlet cavity, and finally exit from the air outlet 206.

Referring to fig. 2 and 5, the top of the second cavity is provided with a reducing section 207, and the bottom of the second cavity is sequentially provided with a fourth step 211 and a fifth step 212.

The provision of the reducer section 207 and the fourth step 211 forms an annular outlet chamber 7 between the inner wall of the sleeve 2 and the outer wall of the filter cartridge 4. The volume of the annular outlet cavity 7 can also be adjusted by changing the variable diameter section 207 and the fourth step 211.

Referring to fig. 5, the bottom of the filter element 4 is provided with a positioning ring 9, the upper portion of the positioning ring 9 is provided with a second annular boss 902, the second annular boss 902 is clamped at the fifth step 212 to perform a limiting function, and a second sealing ring 901 is further arranged between the positioning ring 9 and the side wall of the fifth step 212 to prevent shale gas from leaking to the lower end enclosure 5.

Further, referring to fig. 3, the bottom of the sleeve 2 is further provided with a back flushing port 205, and the back flushing port 205 is communicated with the annular air outlet cavity 7. During the sand removing process, the filter holes on the filter element 4 are inevitably blocked by the gravel, and in the condition, a high-pressure air source is connected to the backflushing port, so that part of the gravel can be flushed back to the filter channel from the filter holes and then falls into the sand storage cavity of the lower seal head 5.

Further, referring to fig. 2, the bottom of the sleeve 2 is further provided with a discharge port 204, and the discharge port 204 is communicated with the annular air outlet cavity 7, so that high pressure in the annular air outlet cavity 7 is released through the discharge port 204 during maintenance.

Further, referring to fig. 2, the top of the sleeve 2 is further provided with a first differential pressure gauge port 202, and the first differential pressure gauge port 202 is communicated with the annular air inlet cavity 6; the bottom of the sleeve 2 is also provided with a second differential gauge port 203, and the second differential gauge port 203 is communicated with the annular air outlet cavity 7. Be connected with the differential pressure gauge between first differential pressure gauge mouth 202 and the second differential pressure gauge mouth 203 for detect the atmospheric pressure difference between annular air inlet chamber 6 and the annular air outlet chamber 7, the atmospheric pressure of annular air inlet chamber 6 is all the same with the atmospheric pressure that admits air, the atmospheric pressure in the filtration passageway, when the filtration pore of filter core 4 blockked up too much, can cause the pressure in the annular air outlet chamber 7 to be obviously less than the atmospheric pressure in the annular air inlet chamber 6, the numerical value maintainer through observing the differential pressure gauge just knows the jam condition of filter core 4.

Further, the lower end enclosure 5 is welded, connected by screw threads or integrally formed on the end face of the bottom of the sleeve 2.

In order to more clearly illustrate the relationship between the first cavity, the second cavity, the annular inlet cavity, the annular outlet cavity and the filtering channel in the embodiment, the following is set forth: when the sleeve 2 is not provided with the transition sleeve 3 and the filter element 4, the hollow cavity in the sleeve 2 is divided into a first cavity at the upper part and a second cavity at the lower part. After the transition sleeve 3 is arranged in the first cavity, the first cavity is divided into two parts, the space between the outer wall of the transition sleeve 3 and the first cavity is an annular air inlet cavity 6, and the space between the inner wall of the transition sleeve 3 is the upper part of the filtering channel. When the filter element 4 is arranged in the second cavity, the second cavity is divided into two parts, the space between the inner wall of the second cavity and the outer wall of the filter element 4 is an annular air outlet cavity 7, and the space on the inner wall of the filter element 4 is the lower part of the filter channel.

The utility model discloses a theory of operation does:

1. the gas containing the sand shale enters from the gas inlet and reaches the annular gas inlet cavity, the flow section is enlarged, the space volume is enlarged, the flow velocity of the gas is reduced, the buffer effect is achieved, and the scouring of sand grains with kinetic energy to the sleeve is reduced; the gas changes the flow direction in the transition sleeve and enters the filter element; under the action of the pressure difference between the inlet and the outlet, the gas flows in and out to pass through the filter element and reach the outlet.

2. The sand containing shale body is in the circulation process, sand grains are separated by the filter element and attached to the inner wall of the filter element, due to the fact that the sand grains enter and exit from the upper part, the inlet is higher than the outlet, the gravity direction of the attached sand grains is consistent with the gas flowing direction, and therefore the sand grains accumulated on the wall of the filter element are blown down by the passing gas and are collected at the bottom of the desander. Thereby enabling the filter element to work effectively for a long time.

3. The collected sand is discharged from a valve connected with the bottom of the lower seal head.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A vertical filtering desander is characterized by comprising a quick-opening blind plate, a sleeve, a transition sleeve, a filter element and a lower end enclosure;

the sleeve is internally provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the transition sleeve is fixed in the first cavity, the filter element is fixed in the second cavity, and the transition sleeve is pressed at the top end of the filter element;

2. The vertical filter desander as recited in claim 1 wherein said transition sleeve top end is further provided with a compression mechanism for compressing said transition sleeve and filter element.

3. The vertical filtering sand remover as claimed in claim 2, wherein the sleeve has an internal thread on the inner wall of the top end thereof, the pressing mechanism comprises two locking nuts, and the outer walls of the two locking nuts are provided with external threads matched with the internal thread.

4. The vertical filtering desander as claimed in claim 2, wherein the inner wall of the top end of the sleeve is provided with internal threads, the pressing mechanism is a pressing cover and a locking nut, the vertical section of the pressing cover is in a convex shape, the locking nut is in a circular ring shape, and the outer walls of the pressing cover and the locking nut are provided with external threads matched with the internal threads.

5. The vertical filtering desander as claimed in claim 1, wherein the bottom of the first cavity is provided with a first step, a second step and a third step in sequence;

6. The vertical filtering desander as claimed in claim 5, wherein the top of the second cavity is provided with a reducer section, and the bottom of the second cavity is provided with a fourth step and a fifth step in sequence;

7. The vertical filtering desander as recited in claim 1 wherein a backwash opening is further provided at the bottom of the sleeve, said backwash opening being in communication with the annular outlet chamber.

8. The vertical filtering desander as recited in claim 1 wherein a drain port is further provided in the bottom of the sleeve, said drain port being in communication with the annular outlet chamber.

9. The vertical filter desander as recited in claim 5 wherein said sleeve top is further provided with a first differential gauge port, said first differential gauge port communicating with said annular inlet chamber;

10. The vertical filtering desander as claimed in claim 1 wherein the lower head is welded, screwed or integrally formed on the bottom end surface of the sleeve.