阅读说明：本技术 一种防砂筛管 (Sand-proof screen pipe ) 是由 姜水 于 2021-09-01 设计创作，主要内容包括：本发明提出一种防砂筛管。涉及油田井下工具技术领域。上接头连接外筛管和内筛管,内筛管外侧套有过滤网；内筛管和外筛管之间安装有扩张组件,扩张组件通过高压管连接连接上接头的边孔,边孔向上延伸到上接头的内孔,上接头的内孔连通边孔的下侧,上接头上开有圆锥环形的球座。本发明具有如下有益效果：设置投入可溶球打压的方式推动活塞向外移动,当活塞向外推进时,推板将圆弧部位向外推动变形,外筛管的整体直径变大,牢固的镶嵌在井底的井壁上,无需进行砾石填充作业来保证对井壁施加正向的支撑力,四周扩张的外筛管使井壁受压均匀,由支撑环、内筛管和扩张组件提供的支撑力,外筛管的强度不会随变形而降低,防止筛管的位置出现偏移。(The invention provides a sand control screen pipe. Relates to the technical field of oil field downhole tools. The upper joint is connected with an outer sieve tube and an inner sieve tube, and a filter screen is sleeved outside the inner sieve tube; an expansion assembly is installed between the inner sieve tube and the outer sieve tube, the expansion assembly is connected with the side hole of the upper joint through a high-pressure tube, the side hole extends upwards to the inner hole of the upper joint, the inner hole of the upper joint is communicated with the lower side of the side hole, and a conical annular ball seat is arranged on the upper joint. The invention has the following beneficial effects: the mode that the setting was put into soluble ball and is suppressed promotes the piston and outwards removes, when the piston outwards impels, the push pedal outwards pushed the circular arc position and warp, the whole diameter grow of outer screen pipe, firm the inlaying is on the wall of a well in the shaft bottom, need not to carry out gravel packing operation and guarantee to apply forward holding power to the wall of a well, the outer screen pipe of expansion all around makes the wall of a well pressurized even, by the support ring, the holding power that interior screen pipe and expansion assembly provided, the intensity of outer screen pipe can not reduce along with warping, prevent that the position of screen pipe from appearing the skew.)

1. A sand control screen, includes top connection (1), its characterized in that: the lower part of the upper joint (1) is respectively connected with an outer sieve tube (2) and an inner sieve tube (3), the bottom of the outer sieve tube (2) is in threaded connection with a base (5), the bottom of the inner sieve tube (3) falls in a ring groove (6) of the base (5), and a filter screen (4) is sleeved on the outer side of the inner sieve tube (3);

a plurality of layers of expansion assemblies (7) which are uniformly distributed on the circumference are arranged between the inner sieve tube (3) and the outer sieve tube (2), the upper and lower adjacent expansion assemblies (7) are connected through a high-pressure tube (11), the uppermost high-pressure tube (11) is connected with a side hole (9) of the upper joint (1), the side hole (9) upwards extends to the inner hole of the upper joint (1), the inner hole of the upper joint (1) is communicated with the lower side of the side hole (9), and the upper joint (1) is provided with a conical annular ball seat (10).

2. The sand control screen of claim 1, wherein: expansion subassembly (7) include push pedal (12), and push pedal (12) support outside screen pipe (2) inboard, and push pedal (12) inboard is equipped with piston (13), connects through sealing washer clearance fit between piston (13) and cylinder liner (14), and the screen pipe (3) outside including support in cylinder liner (14) inboard, is equipped with intercommunicating pore (15) on cylinder liner (14) and communicates cylinder liner (14) about with the hole respectively.

3. The sand control screen of claim 1, wherein: the inner hole of the inner sieve tube (3) is welded with a support ring (8) at the installation position of the expansion component (7).

4. The sand control screen of claim 2, wherein: the piston 13 is connected with the cylinder sleeve 14 through a one-way tooth 16 which enables the piston 13 to move outwards in one direction.

5. The sand control screen of claim 1, wherein: the high-pressure pipe (11) is a rigid connecting pipe.

6. The sand control screen of claim 1, wherein: the outer sieve tube (2) is processed into an inward concave circular arc (17) structure at the position of installing the expansion assembly (7).

The technical field is as follows:

the invention relates to the technical field of oilfield downhole tools, in particular to a sand control screen pipe.

Background art:

in the oil gas well exploitation in-process, ubiquitous stratum sand production phenomenon, it is the main means who solves oil gas well sand production problem to take sand control measure, and sand control screen pipe is the most important among the sand control measure, use most extensive instrument, the main effect of oil screen pipe is sand control, the sand control screen pipe that uses at present, need carry out gravel packing operation and guarantee to apply forward holding power to the wall of a well, lead to the wall of a well to appear warping easily like this, lead to the transfer of sand grain, lead to the screen pipe jam and the erosion that sand grain caused to it, the deformation of the wall of a well leads to the position of sand control screen pipe to appear shifting easily simultaneously.

The invention content is as follows:

in order to solve the above problems, the present invention provides a sand control screen.

The technical scheme of the invention is as follows: the sieve comprises an upper joint, wherein the lower part of the upper joint is respectively connected with an outer sieve tube and an inner sieve tube, the bottom of the outer sieve tube is in threaded connection with a base, the bottom of the inner sieve tube is arranged in a ring groove of the base, and a filter screen is sleeved outside the inner sieve tube;

a plurality of layers of expansion assemblies which are uniformly distributed in the circumference are arranged between the inner sieve tube and the outer sieve tube, the adjacent expansion assemblies are connected through a high-pressure tube, the uppermost high-pressure tube is connected with the side hole of the upper joint, the side hole extends upwards to the inner hole of the upper joint, the inner hole of the upper joint is communicated with the lower side of the side hole, and the upper joint is provided with a conical annular ball seat.

The expansion assembly comprises a push plate, the push plate abuts against the inner side of the outer sieve tube, a piston is arranged on the inner side of the push plate, the piston and the cylinder sleeve are connected in a clearance fit mode through a sealing ring, the inner side of the cylinder sleeve abuts against the outer side of the inner sieve tube, and a communicating hole is formed in the cylinder sleeve and is communicated with the upper portion and the lower portion of the cylinder sleeve and an inner hole respectively.

The inner hole of the inner screen pipe is welded with a support ring at the installation position of the expansion assembly.

The piston is connected with the cylinder sleeve through one-way teeth which enable the piston to move outwards in one way.

The high-pressure pipe is a rigid connecting pipe.

The outer screen pipe is processed into an inward concave circular arc structure at the position of installing the expansion assembly.

The invention has the following beneficial effects: the mode that the setting was put into soluble ball and is suppressed promotes the piston and outwards removes, when the piston outwards impels, the push pedal outwards pushed the circular arc position and warp, the whole diameter grow of outer screen pipe, firm the inlaying is on the wall of a well in the shaft bottom, need not to carry out gravel packing operation and guarantee to apply forward holding power to the wall of a well, the outer screen pipe of expansion all around makes the wall of a well pressurized even, by the support ring, the holding power that interior screen pipe and expansion assembly provided, the intensity of outer screen pipe can not reduce along with warping, prevent that the position of screen pipe from appearing the skew.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view at A of FIG. 1;

figure 3 is a top view of the outer screen of the present invention.

In the figure, 1-upper joint, 2-outer sieve tube, 3-inner sieve tube, 4-filter screen, 5-base, 6-ring groove, 7-expansion component, 8-support ring, 9-side hole, 10-ball seat, 11-high pressure tube, 12-push plate, 13-piston, 14-cylinder sleeve, 15-communication hole, 16-one-way tooth and 17-arc.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 and fig. 2 to 3, the sand control screen pipe comprises an upper joint 1, wherein the lower part of the upper joint 1 is respectively connected with an outer screen pipe 2 and an inner screen pipe 3, the bottom of the outer screen pipe 2 is in threaded connection with a base 5, the bottom of the inner screen pipe 3 falls in a ring groove 6 of the base 5, and a filter screen 4 is sleeved on the outer side of the inner screen pipe 3;

a plurality of layers of expansion assemblies 7 which are uniformly distributed circumferentially are arranged between the inner sieve tube 3 and the outer sieve tube 2, the upper and lower adjacent expansion assemblies 7 are connected through a high-pressure tube 11, the uppermost high-pressure tube 11 is connected with a side hole 9 of the upper joint 1, the side hole 9 extends upwards to an inner hole of the upper joint 1, the inner hole of the upper joint 1 is communicated with the lower side of the side hole 9, and a conical annular ball seat 10 is arranged on the upper joint 1.

The expansion assembly 7 comprises a push plate 12, the push plate 12 abuts against the inner side of the outer sieve tube 2, a piston 13 is arranged on the inner side of the push plate 12, the piston 13 is in clearance fit connection with a cylinder sleeve 14 through a sealing ring, the inner side of the cylinder sleeve 14 abuts against the outer side of the inner sieve tube 3, and a communicating hole 15 is formed in the cylinder sleeve 14 and is communicated with the upper portion and the lower portion of the cylinder sleeve 14 and an inner hole of the cylinder sleeve respectively.

The inner hole of the inner screen 3 is welded with a support ring 8 at the installation position of the expansion assembly 7 to further improve the supporting force provided by the inner screen 3 to the expansion assembly 7.

The piston 13 is connected with the cylinder sleeve 14 through a one-way tooth 16 which enables the piston 13 to move outwards in one way, the piston 13 moves outwards under the action of hydraulic pressure to push the outer screen pipe 2 to expand outwards, and the piston 13 does not retract under the action of the one-way tooth 16 after the expansion operation is finished, so that the supporting force of the outer screen pipe 2 on the well wall is kept.

The high-pressure pipe 11 is a rigid connecting pipe, and the high-pressure pipe 11 serves as a hydraulic passage for communicating the cylinder liners 14 and also serves to fix the cylinder liners 14.

The outer screen 2 is machined with an inwardly concave circular arc 17 at the location of the installed expansion assembly 7.

After the sand control screen pipe is installed, soluble balls are put into the well bottom, the soluble balls fall on the ball seats 10 to be sealed, the pipe column is pressed, hydraulic pressure enters the cylinder sleeve 14 to push the piston 13 to move outwards, when the piston 13 pushes outwards, the circular arc 17 part is pushed outwards by the push plate 12 to deform, the whole diameter of the outer screen pipe 2 is increased, the outer screen pipe is firmly embedded on the well wall of the well bottom, gravel filling operation is not needed to ensure that positive supporting force is applied to the well wall, the outer screen pipe 2 which is expanded on the periphery enables the well wall to be uniformly pressed, the supporting force provided by the supporting ring 8, the inner screen pipe 3 and the expansion assembly 7 ensures that the strength of the outer screen pipe 2 cannot be reduced along with deformation, the screen pipe is prevented from being deviated in position, and after the soluble balls are dissolved, the installation is completed.