CN212583656U

CN212583656U - Sleeve cleaning filter

Info

Publication number: CN212583656U
Application number: CN202021821879.3U
Authority: CN
Inventors: 蔡万伟; 徐希良; 李壮
Original assignee: Petrostar Oil Technology Co ltd
Current assignee: Petrostar Oil Technology Co ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-02-23
Anticipated expiration: 2030-08-27

Abstract

A cannula cleaning filter comprising: a mandrel; the leather cup overflowing sleeve is sleeved outside the mandrel; the leather cup is arranged at the opening of the leather cup overflowing sleeve; the movable piston is arranged on the outer side surface of the mandrel; the pushing end of the movable piston is contacted with the internal channel of the cup flow-through sleeve so as to move under the pressure of the fluid flowing in the internal channel; the filter screen is arranged on the side surface of the mandrel and is communicated with the internal channel of the cup overflowing sleeve, the mandrel and the external space of the cup overflowing sleeve; when the movable piston is positioned at the first position, the contact between the filter screen and the outside is shielded by the shielding piece; when the movable piston overcomes the resistance of the reset mechanism and moves to the second position, the movable piston removes the shielding piece, so that the fluid can flow to the external space from the filter screen, and the filtering effect is realized. The utility model discloses a clean filter of sleeve pipe can need not bowling and plug activation along with the automatic activation of playing the brill, adopts screen pipe or slot pipe filtration impurity, supports to maintain and uses many times after the maintenance.

Description

Sleeve cleaning filter

Technical Field

The utility model relates to an oil casing cleaning means, especially a clean filter of sleeve pipe.

Background

The casing filter is used to collect waste residues generated by scraping cement lumps, hard wax, various salt crystals and deposits, burrs, rust, etc. on the inner wall of the casing by a scraper, so as to smoothly run various downhole tools in the casing. Especially when the annular space between the downhole tool and the inner wall of the casing is small, the next working procedure is carried out after full scraping and filtering. At present, when some oil fields in China and some oil and gas wells in foreign countries are constructed, the use of a pipe scraper and a filter is an indispensable process, and the purpose is to improve the success rate of running downhole tools. The use of the filter enables to collect impurities left in the casing from the previous process. Such as increasing packer setting success rates. Due to the complex downhole environment, foreign matter or change of the inner diameter of the casing is likely to occur in the casing, thereby affecting the setting of the packer, and at this time, development of a casing cleaning tool is urgently needed to solve the problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, the main objective of the present invention is to provide a casing cleaning filter, which is intended to at least partially solve the above technical problems.

In order to achieve the above object, the utility model provides a clean filter of sleeve pipe, include:

the core shaft is hollow and communicated up and down;

the leather cup overflowing sleeve is sleeved outside the mandrel, an overflowing channel is formed in the leather cup overflowing sleeve, and an opening is formed in one side, facing the leather cup, of the leather cup overflowing sleeve;

the leather cup is arranged at the opening of the leather cup overflowing sleeve and can slide under force to open the opening of the leather cup overflowing sleeve;

the movable piston is arranged on the outer side surface of the mandrel and can move between a first position and a second position in the length direction of the mandrel; the pushing end of the movable piston is in contact with the internal channel of the cup flow-through sleeve, so that the movable piston can move under the pressure of fluid flowing in the internal channel of the cup flow-through sleeve; the movable piston is provided with a reset mechanism;

the filter screen is arranged on the side surface of the mandrel, one surface of the filter surface is connected with the internal channel of the cup overflowing sleeve, and the other surface of the filter surface is in contact with the mandrel and the external space of the cup overflowing sleeve;

when the movable piston is located at the first position, the contact between the filter screen and the external space is shielded by the shielding piece; when the movable piston moves to the second position under the internal fluid pressure by overcoming the resistance of the reset mechanism, the movable piston removes the shielding piece which shields the filter screen from contacting with the external space, so that the fluid flowing in the internal channel of the leather cup flow-through sleeve can flow to the external space from the filter screen.

Based on the above technical scheme can know, the utility model discloses a clean filter of sleeve pipe has one of following beneficial effect at least:

(1) the utility model discloses a big bypass hole design supports to bore down fast. The automatic activation along with the tripping can be realized, and the ball throwing and the rubber plug activation are not needed;

(2) the filter screen adopts a sieve tube or a slotted tube to filter impurities, and the filter screen can be used for multiple times after maintenance, so that the cost is saved;

(3) during drilling, the leather cup is in interference fit with the inner wall of the casing pipe, so that slurry is collected and impurities in the slurry are filtered;

(4) the upper part and the lower part of the filter are connected by adopting drill rod buckles, so that the effects of high strength, tensile strength and torsion resistance are achieved.

Drawings

Fig. 1 is a longitudinal sectional view of a casing cleaning filter according to the present invention.

In the above figures, the reference numerals have the following meanings:

1. core shaft 2, leather cup overflowing sleeve

3. Centralizer support sleeve 4 and centralizer

5. Connecting short piece 6, filter screen jacket

7. Support ring 8 and movable piston

9. Lower joint 10, cylindrical spring

14. Leather cup 15, filter screen support ring

16. Filter screen plug 17 and filter screen

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. Because the utility model discloses the position that the product was put can change at will, the utility model discloses in position words such as "upper", "lower", "left", "right", only show relative position relation, and do not be used for injecing absolute position relation. In the following description, although referring to fig. 1, the circulation valve special for wellhead of the present invention adopts the reverse vertical arrangement (the paper is viewed from left to right according to the figure number), the upper joint is located below the paper, the lower joint is located above the paper, but for better corresponding to the actual product, the upper and lower relations are adopted, that is, the upper joint is located above, the lower joint is located below, and the whole product is in the vertical state during actual operation

The utility model discloses a clean filter of sleeve pipe, it includes:

the core shaft is hollow and communicated up and down;

the leather cup overflowing sleeve is sleeved outside the mandrel, and is opened towards one side of the leather cup, and an overflowing channel is formed inside the leather cup overflowing sleeve;

the leather cup is arranged at the opening of the leather cup overflowing sleeve and can slide under force to open the opening of the leather cup overflowing sleeve; the leather cup can be made of materials such as rubber, resin, thin metal and the like, and is preferably made of elastic materials, so that the leather cup can be stretched to be tightly attached to the inner wall of the sleeve pipe to the greatest extent when being stressed, and blocking slurry is prevented from flowing through the outer side of the leather sleeve;

the movable piston is arranged on the outer surface of the mandrel and can move between a first position and a second position in the length direction of the mandrel; the pushing end of the movable piston is in contact with the internal channel of the cup flow-through sleeve, so that the movable piston can move under the pressure of fluid flowing in the internal channel of the cup flow-through sleeve; the movable piston is provided with a reset mechanism;

when the movable piston is positioned at the first position, the movable piston blocks the filter screen from contacting with the external space; when the movable piston moves to the second position against the resistance of the reset mechanism under the internal fluid pressure, the movable piston no longer blocks the contact between the filter screen and the external space, so that the fluid flowing in the inner channel of the leather cup flow sleeve can flow to the external space from the filter screen.

Wherein, still be provided with the centralizer of installing on centralizer support cover on the dabber surface for the location of dabber.

Wherein, still be provided with the connection nipple joint on the dabber surface for form the seal structure of portable opening with moving the piston.

Wherein, the reset mechanism of the movable piston adopts a cylindrical spring.

The filter screen is designed in an annular or ring-like large-area mode, namely, the filter screen is designed with large bypass holes, and large-flow fluid can pass through the filter screen.

Wherein, the filter screen adopts a screen pipe or a slotted pipe.

Wherein, the upper and lower parts of the mandrel are provided with drill rod buckles or parts connected with the drill rod buckles.

The utility model also discloses a use method of above-mentioned sleeve pipe cleaning filter, including following step:

when the sleeve is used for cleaning the mandrel of the filter, connecting the tubular column, wherein slurry flows through the mandrel and the lower connector when the sleeve is in positive circulation, and flows out of other tools after passing through other tools to reach the annular space between the other tools and the inner wall of the sleeve;

when the casing cleaning filter is required to be used for filtering casing annular mud, the method is realized by lifting the pipe column, and the specific method comprises the following steps: lifting the pipe column, applying annular slurry to the leather cup, moving the leather cup downwards, and closing the external channel; the mud flows into the sleeve cleaning filter from the leather cup through the inner channel of the sleeve, flows through the support ring, the filter screen support ring and the filter screen, and acts on the movable piston and the cylindrical spring to open the outer channel on the outer sleeve of the filter screen; thereby leaving clean drilling fluid or mud in the annulus while impurities, rust, etc. are collected by the filter screen.

The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the casing cleaning filter of the present invention mainly comprises the following components: the device comprises a mandrel 1, a leather cup overflowing sleeve 2, a centralizer supporting sleeve 3, a centralizer 4, a connecting short section 5, a filter screen outer sleeve 6, a supporting ring 7, a movable piston 8, a lower connector 9, a cylindrical spring 10, a leather cup 14, a filter screen supporting ring 15, a filter screen plug 16 and a filter screen 17.

The core shaft 1 of the sleeve cleaning filter is connected with a pipe column, when the sleeve cleaning filter is in positive circulation, slurry flows through the core shaft 1 and the lower connector 9, and after passing through other tools, the slurry flows out of the inside of the tools and reaches the annular space between the tools and the inner wall of the sleeve, the slurry pushes the rubber cup 14, the flow channel of the rubber cup overflowing sleeve is opened, and then the slurry flows to the annular space on the upper surface, so that the positive circulation is realized.

When the casing cleaning filter is required to be used for filtering casing annulus mud, the casing cleaning filter can be realized by lifting the pipe column. The specific method comprises the following steps: the pipe string is lifted, the annular mud acts on the cup 14, and the cup 14 moves downwards to close the external channel. The mud flows from the cup through the internal channel of the sleeve 2 into the filter, through the support ring 7, the sieve support ring 15, the sieve 17, the mud acting on the actuating piston 8 and the cylindrical spring 10 opening the external channel in the sieve jacket 6. Therefore, the clean drilling fluid or mud is left in the annular space, and impurities, rust and the like are collected by the filter screen.

Through a plurality of tests, the utility model can support fast drilling because of the design of the large bypass hole; the automatic activation along with the tripping can be realized, and the ball throwing and the rubber plug activation are not needed; the filter screen adopts a sieve tube or a slotted tube to filter impurities, so that the filter screen can be used for multiple times after maintenance, and the cost is saved; during drilling, the leather cup is in interference fit with the inner wall of the casing pipe, so that the mud is collected and impurities in the mud are filtered. The upper part and the lower part of the filter are connected by adopting drill rod buckles, so that the effects of high strength, tensile strength and torsion resistance are achieved.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A cannula cleaning filter, comprising:

the core shaft is hollow and communicated up and down;

2. The cannula cleaning filter of claim 1, wherein the cup is made of rubber, resin, or thin metal material.

3. The casing cleaning filter of claim 2, wherein the cup is made of a resilient material so as to be forced to open as close as possible to the inner wall of the casing to block slurry from flowing outside the casing.

4. The cannula cleaning filter of claim 1, wherein the return mechanism for the movable piston is a cylindrical spring.

5. The casing cleaning filter of claim 1, wherein the filter screen is designed with large bypass holes to allow a large flow of fluid, and the area occupied by the filter screen is equal to or larger than half of the area of the mandrel.

6. The casing cleaning filter of claim 1, wherein the screen is a screen or a slotted pipe.

7. The casing cleaning filter of claim 1, wherein the mandrel is further provided with a centralizer mounted on the centralizer support sleeve on an outer surface thereof for positioning of the mandrel.

8. The casing cleaning filter of claim 1, wherein the mandrel is further provided with a connector sub on an outer surface thereof for forming a movably openable seal with the movable piston.

9. The casing cleaning filter of claim 1, wherein the upper and lower parts of the mandrel are provided with drill pipe buckles or parts capable of being connected with the drill pipe buckles.