CN109931037B - Self-adaptive control screen pipe and method - Google Patents
Self-adaptive control screen pipe and method Download PDFInfo
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- CN109931037B CN109931037B CN201910289766.9A CN201910289766A CN109931037B CN 109931037 B CN109931037 B CN 109931037B CN 201910289766 A CN201910289766 A CN 201910289766A CN 109931037 B CN109931037 B CN 109931037B
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- 239000007788 liquid Substances 0.000 claims description 30
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Abstract
The invention relates to a self-adaptive control screen pipe and a self-adaptive control method. The technical proposal is as follows: an annular valve is arranged between the annular space of the core tube and the outer cylinder by adopting a concentric double-tube structure of the core tube and the outer cylinder. The core tube and the outer tube are respectively divided into an upper section and a lower section, wherein a gap or a hole is arranged on the wall of one section of the tube, the other section of the tube is used as a sealing section, the sealing section of the core tube and the sealing section of the outer tube are staggered at different sides, and the outer wall of the core tube is provided with a limiting step. When the pressure in the core tube is higher than the pressure outside the outer cylinder, the pressure in the core tube pushes the annular valve to move to the limit step, and the sealing section of the core tube, the annular valve and the sealing surface of the outer cylinder are combined together to form an oil pipe function of the inner pressure-bearing sealing system; when the external pressure of the outer cylinder is greater than the internal pressure of the core tube, the external pressure pushes the annular valve to be away from the limiting step, and the gap or the hole of the outer cylinder is communicated with the gap or the hole of the core tube to form a circulation channel, so that external fluid of the tool automatically enters the core tube, and the gap or the hole blocks the sieve tube function of large-particle sand or large-solid.
Description
Technical Field
The invention relates to the field of well completion engineering in petroleum industry, in particular to a self-adaptive control screen pipe and a self-adaptive control method.
Background
At present, in newly-increased oil field exploration reserves, nearly 80% of the oil and gas reservoirs are low-permeability oil and gas reservoirs and thick oil and gas reservoirs, the geological conditions of the oil and gas reservoirs are more and more complex, and the effective, efficient and long-acting utilization of the oil and gas reservoirs becomes a worldwide difficult problem.
For low permeability reservoirs, in order to reduce seepage resistance and effectively communicate with the reservoir, long well sections and open hole horizontal well completions are adopted, and a multi-stage layering section fracturing or filling sand prevention mode is adopted for modification. The development process also has the following problems: the fracturing sliding sleeve is used as a channel for fracturing fluid to enter the reservoir and reform the reservoir, and is also used as a production channel, namely a gas flow or liquid flow channel between the reservoir and the shaft. Because the opening of the fracturing sliding sleeve is larger, when the air flow or the liquid flow enters, filling sand and stratum fragments near the shaft can be carried into the shaft to block the oil pipe channel; in particular, as the exploitation proceeds, the formation energy decreases, the collapse of the well wall is increased, and the gas flow or liquid flow can bring more and massive formation fragments into the oil pipe, so that the well bore of the horizontal well in the long well section is seriously blocked, and is difficult to unlock, thus greatly influencing the long-term exploitation of the oil-gas well.
For a heavy oil reservoir, in order to reduce seepage resistance and effectively communicate with the reservoir, the heavy oil reservoir is suitable for development of long well sections and open hole horizontal wells, but is limited by the functions of the existing screen pipes, sand prevention can only be filled in a general way by adopting the forward direction at the upper part or the reverse direction at the bottom, and the general sand prevention filling has poor quality under the condition of the long well sections; meanwhile, in the implementation of the open hole horizontal well process, in order to ensure that a well completion screen pipe reenters an open hole well after well drilling, an artificial well wall is needed, a mud cake is needed to be washed after a screen pipe is inserted, the artificial well wall is eliminated, the artificial well wall collapses, and then the sand prevention is carried out in a general filling mode, so that the effect is poorer.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art, and provides a self-adaptive control screen pipe and a self-adaptive control method, which form a multi-section staged fracturing or filling sand prevention process of a long-well section open hole horizontal well transformed section by section, so as to realize effective, efficient and long-acting use of a low-permeability oil and gas reservoir and a heavy oil reservoir.
The invention relates to a self-adaptive control screen pipe, which has the technical scheme that: an annular valve (5) is arranged between the annular space of the core tube (1) and the annular space of the outer tube (3), the core tube (1) and the outer tube (3) are respectively divided into an upper section and a lower section, a first gap or hole (4) is formed in one section of tube wall, the other section of tube wall is used as a sealing section, the sealing section of the core tube (1) and the sealing section of the outer tube (3) are staggered at different sides, and a limiting step (12) is arranged on the outer wall of the core tube (1); when the pressure in the core tube (1) is greater than the external pressure of the outer cylinder (3), the pressure in the core tube (1) is transmitted between the core tube and the outer cylinder (3) through a first gap or hole of the core tube (1), the annular valve (5) is pushed to move to the limit step (12), the core tube sealing section, the annular valve and the outer cylinder sealing surface are combined together to form an inner pressure-bearing sealing system, and at the moment, the inner pressure-bearing and inner pressure up-down transmission functions of the oil tube can be achieved; when the external pressure of the outer cylinder (3) is larger than the pressure in the core tube (1), the external pressure is transmitted between the core tube (1) and the outer cylinder (3) through a second gap or hole of the outer cylinder (3), the annular valve (5) is pushed to be far away from the limit step (12), the second gap or hole of the outer cylinder, the first gap or hole of the core tube and the annular space of the core tube are combined together to form a circulation channel, external fluid is enabled to enter the core tube (1), and the second gap or hole blocks sand with large particle size or sieve tube functions of large solid.
Preferably, the core tube (1) and the outer tube (3) are respectively divided into an upper section and a lower section, a first gap or hole (4) is formed in the upper section tube wall of the core tube (1), the lower section tube wall of the core tube (1) is used as a sealing section, the upper section tube wall of the outer tube (3) is used as a sealing section, and a second gap or hole (8) is formed in the lower section tube wall, so that a staggered structure is formed, and a limiting step (12) is formed in the outer wall of the core tube (1).
Preferably, the core tube (1) and the outer tube (3) are respectively divided into an upper section and a lower section, a first gap or hole (4) is arranged on the lower section wall of the core tube (1), the upper section wall of the core tube (1) is used as a sealing section, the lower section wall of the outer tube (3) is used as a sealing section, a second gap or hole (8) is arranged on the upper section wall, so that a staggered structure is formed, and a lower limit support (13) is arranged at the lower ends of the core tube (1) and the outer tube (3); the outer wall of the core tube (1) is provided with a limit step (12).
Preferably, the annular space between the core tube (1) and the outer cylinder (3) is divided into an isolated annular space (9) and a liquid passing annular space (10) through an annular space valve (5).
Preferably, the annular valve (5) adopts an annular piston, the inner wall and the outer wall of the annular piston are respectively provided with a second sealing ring (6) and a third sealing ring (7), the annular piston is sealed with the outer wall of the core tube (1) through the second sealing ring (6), and the annular piston is sealed with the inner wall of the outer cylinder (3) through the third sealing ring (7).
Preferably, the annular valve (5) adopts an annular sliding sleeve, and the inner wall and the outer wall of the annular sliding sleeve are respectively matched with the outer wall of the core tube (1) and the inner wall of the outer tube (3) through mechanical sealing.
The invention relates to a use method of a self-adaptive control screen pipe, which adopts the following technical scheme: the method comprises the following two using processes:
(1) Oil pipe function: when the pressure of liquid or gas in the self-adaptive control sieve tube is higher than that of liquid or gas outside the self-adaptive control sieve tube, the pressure in the oil tube pushes the annular valve (5) to descend to the position of the limit step (12) in the isolation annular space (9) through the first gap or hole (4) at the upper part of the core tube (1), so that the core tube (1), the annular valve (5) and the outer cylinder (3) form a closed space to prevent liquid flow or gas flow from overflowing from the self-adaptive control sieve tube, and the liquid flow or gas flow can only descend along the inner wall of the core tube to play a role of the oil tube;
(2) Screen pipe function: when the pressure of liquid or gas outside the self-adaptive control sieve tube is higher than that in the self-adaptive control sieve tube, the pressure outside the outer tube (3) pushes the annular valve (5) to move upwards in the isolation annular space (9) through a second gap or hole (8) on the outer tube (3), so that the liquid or gas flow outside the self-adaptive control sieve tube is pushed to the end part of the isolation annular space (9), firstly enters the liquid passing annular space (10) between the outer tube (3) and the core tube (1) through a second gap or hole (8) at the lower part of the outer tube (3), then enters the inner wall cavity of the core tube (1) through a first gap or hole (4) at the upper part of the core tube (1), the communication from outside of a tool to the liquid or gas flow in the tool is realized, and the gap or hole plays a role in sand prevention of the sieve tube.
Preferably, the annular valve (5) adopts an annular piston, the inner wall and the outer wall of the annular piston are respectively provided with a second sealing ring (6) and a third sealing ring (7), the annular piston is sealed with the outer wall of the core tube (1) through the second sealing ring (6), and the annular piston is sealed with the inner wall of the outer cylinder (3) through the third sealing ring (7).
Preferably, the annular valve (5) adopts an annular sliding sleeve, and the inner wall and the outer wall of the annular sliding sleeve are respectively matched with the outer wall of the core tube (1) and the inner wall of the outer tube (3) through mechanical sealing.
The beneficial effects of the invention are as follows:
1. in the design method, the performance characteristics of the oil pipe and the sieve tube are innovatively combined, and a single tool not only realizes the oil pipe function of transmitting power and kinetic energy in the pipe, but also realizes the sieve tube function of blocking sand and preventing sand when the stratum is communicated with the shaft;
2. in structural design, the inner and outer double-layer pipes and the upper and lower openings or slits of each part are combined in a sealing way, and the positions of annulus valves are controlled by liquid flow/gas flow pressures in different directions, so that the switching of the switching function of the whole tool is realized. Closing the valve to realize the function of the oil pipe for transmitting internal pressure required by the well completion engineering, and opening the valve to realize the function of the sand blocking and preventing screen pipe during oil gas production;
3. the method realizes the integral requirement of the fracturing reformation of the layering section and the sand prevention process of the sieve tube, effectively solves the problem that the existing layering section is not capable of effectively preventing sand after fracturing reformation, and meets the requirement of long-term development of low-permeability oil reservoirs;
4. the same process pipe column is used in the multi-layer section layered filling sand prevention process of the sandstone oil reservoir, so that the layered section filling sand prevention of more layers of sections of the sandstone oil reservoir with longer well sections, such as a horizontal well, a branch well and the like, which are difficult to be used in the well can be realized, the filling quality is good, and the service life of the sand prevention well is long; the sand prevention of the layering section does not need the cooperation of an inner pipe, an inner filling tool and the like, and the construction is simpler, more convenient and safer. The problem that the filling quality is poor in conventional filling caused by collapse of an artificial well wall after acid washing mud cake flowback of an open hole horizontal well of a sandstone oil reservoir is effectively solved;
5. the sand control process pipe column filled in the layering section can realize the functions of flushing and descending simultaneously, and effectively solves the problems that when sand is produced from the stratum, the screen pipe is blocked when entering into the stratum, and complex wells such as a horizontal well and a branch well are difficult to enter and cannot enter in place.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention functioning as an oil pipe;
FIG. 2 is a schematic illustration of the screen functioning as a first embodiment of the present invention;
FIG. 3 is a schematic diagram of segment 1 reconstruction in segment reconstruction of a technique pipe column structure of the invention applied to open hole horizontal well fracturing/filling sand prevention integration;
FIG. 4 is a schematic illustration of the present invention as applied to production of an open hole horizontal well fracturing/packing sand control integrated process string;
FIG. 5 is a schematic diagram of the structure of a second embodiment of the present invention functioning as an oil pipe;
FIG. 6 is a schematic illustration of a screen functioning as a second embodiment of the present invention;
in the upper graph: the annular valve comprises a core tube 1, a first sealing ring 2, an outer cylinder 3, a first gap or hole 4, an annular valve 5, a second sealing ring 6, a third sealing ring 7, a second gap or hole 8, an isolated annular space 9, a liquid passing annular space 10, an upper limiting step 11, a limiting step 12, a lower limiting support 13, a fourth sealing ring 14 and a fifth sealing ring 15;
the well casing comprises a casing a1, a guide plug a2, a1 st section door-closing reforming sliding sleeve a3, a1 st section self-adaptive control screen pipe a4, a1 st section open hole packer a5, a2 nd section door-closing reforming sliding sleeve a6, a2 nd section self-adaptive control screen pipe a7, a2 nd section open hole packer a8, an N th section door-closing reforming sliding sleeve a9, an N th section self-adaptive control screen pipe a10, an N th section open hole packer a11, a lower oil pipe a12, a hanging packer a13 and an upper oil pipe a14.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Embodiment 1, the technical scheme of the self-adaptive control screen pipe provided by the invention is as follows: the concentric double-tube structure of the core tube 1 and the outer tube 3 is adopted, an annulus valve 5 is arranged between the annulus of the core tube 1 and the annulus of the outer tube 3, the core tube 1 and the outer tube 3 are respectively divided into an upper section and a lower section, a first gap or hole 4 is arranged on the wall of the upper section of the core tube 1, the wall of the lower section of the core tube 1 is used as a sealing section, the wall of the upper section of the outer tube 3 is used as a sealing section, a second gap or hole 8 is arranged on the wall of the lower section of the outer tube, so that a staggered structure is formed, and a limiting step 12 is arranged on the outer wall of the core tube 1; when the pressure in the core tube 1 is greater than the external pressure of the outer cylinder 3, the pressure in the core tube 1 is transmitted between the core tube 3 and the outer cylinder 3 through a first gap or hole of the core tube 1, the annular valve 5 is pushed to move to the limit step 12, the core tube sealing section, the annular valve and the outer cylinder sealing surface are combined together to form an internal pressure bearing sealing system, and at the moment, the internal pressure bearing and the internal pressure of the oil tube can be transmitted up and down; when the external pressure of the outer cylinder 3 is larger than the pressure in the core tube 1, the external pressure is transmitted between the core tube 1 and the outer cylinder 3 through a second gap or hole of the outer cylinder 3, the annular valve 5 is pushed to be far away from the limiting step 12, the second gap or hole of the outer cylinder, the first gap or hole of the core tube and the annular space of the core tube are combined together to form a circulation channel, so that external fluid enters the core tube 1, and the second gap or hole blocks sand with large particle size or a sieve tube function of large solid.
Wherein, the annular space between the core tube 1 and the outer cylinder 3 is divided into an isolated annular space 9 and a liquid passing annular space 10 through an annular space valve 5; in addition, an upper limit step 11 with a conical structure is arranged at one end of the isolation annulus 9, and a raised limit step 12 is arranged at the other end.
In addition, the annular valve 5 adopts an annular piston, the inner wall and the outer wall of the annular piston are respectively provided with a second sealing ring 6 and a third sealing ring 7, the annular piston is sealed with the outer wall of the core tube 1 through the second sealing ring 6, and the annular piston is sealed with the inner wall of the outer cylinder 3 through the third sealing ring 7.
The invention relates to a use method of a self-adaptive control screen pipe, which adopts the following technical scheme: the method comprises the following two using processes:
1 oil pipe function: when the pressure of the liquid or gas in the self-adaptive control sieve tube is higher than that of the liquid or gas outside the self-adaptive control sieve tube, the pressure in the oil tube pushes the annular valve 5 to descend to the position of the limit step 12 in the isolation annular 9 through the first gap or hole 4 at the upper part of the core tube 1, so that the core tube 1, the annular valve 5 and the outer cylinder 3 form a closed space to prevent liquid flow or gas flow from overflowing from the self-adaptive control sieve tube, and the liquid flow or gas flow only can descend along the inner wall of the core tube to play a role of the oil tube;
2 sieve tube function: when the pressure of liquid or gas outside the self-adaptive control sieve tube is higher than that in the self-adaptive control sieve tube, the pressure outside the outer tube 3 pushes the annular valve 5 to ascend in the isolation annular space 9 through the second gap or hole 8 on the outer tube 3, so that the pressure is pushed to the upper limit step 11 at the end part of the isolation annular space 9, liquid flow or gas flow outside the self-adaptive control sieve tube firstly enters the liquid passing annular space 10 between the outer tube 3 and the core tube 1 through the second gap or hole 8 at the lower part of the outer tube 3, and then enters the inner wall cavity of the core tube 1 through the first gap or hole 4 at the upper part of the core tube 1, so that the communication in a tool outside a tool is realized, and the sieve tube function is realized.
Referring to fig. 3-4, when the invention is applied to an open hole horizontal well fracturing/filling sand control integrated process, the open hole horizontal well fracturing/filling sand control integrated process pipe column comprises a sleeve a1, a guide plug a2, a1 st section door-closing reforming sliding sleeve a3, a1 st section self-adaptive control screen pipe a4, a1 st section open hole packer a5, a2 nd section door-closing reforming sliding sleeve a6, a2 nd section self-adaptive control screen pipe a7, a2 nd section open hole packer a8, an N th section door-closing reforming sliding sleeve a9, an N th section self-adaptive control screen pipe a10, an N th section open hole packer a11, a lower oil pipe a12, a hanging packer a13 and an upper oil pipe a14.
When in use, the method comprises the following steps:
(1) The following steps: lowering the segmented modified string into the wellbore as shown in FIG. 3, and suspending the packer in the casing;
(2) Setting: pressurizing and setting each level of open hole packer, continuously pressurizing until the suspended packer is completely set, and then releasing pressure;
(3) Segment transformation: the steel ball is thrown to the door-closing reforming sliding sleeve of the 1 st section, the circulation channel of each stage of self-adaptive control sieve tube is closed under the hydraulic action, the inner cylinder of the door-closing reforming sliding sleeve is hydraulically pushed, the 1 st section reforming sliding sleeve is opened, sand adding reforming of the 1 st section is carried out according to the design, and the 1 st section reforming is completed; then, a second steel ball is thrown, the flow channel of the self-adaptive control screen pipe with more than the 2 nd section is closed under the hydraulic action, the hydraulic pushing can close the door to reform the inner cylinder of the sliding sleeve, the 2 nd section can close the door to reform the sliding sleeve, the 2 nd section is reformed by sand adding according to the design, and the 2 nd section is reformed; the method comprises the steps of upward returning section by section, and finishing the transformation of each section in sequence;
(4) Closing a door: continuing to open the oil pipe gate, pushing each section of steel balls by stratum pressure to flow back, and pushing each stage of door-closing-capable sliding sleeve to open by the steel balls;
(5) And (3) production: the production string is shown in fig. 4. And opening a circulation channel by each section of self-adaptive control screen pipe under the action of stratum hydraulic pressure to carry out production.
The invention is characterized in that: the first is that the fracturing sliding sleeve or filling tool provides a fracturing and sand adding reconstruction channel, and the screen pipe provides a production channel. The pipe column has the sand blocking function when realizing multilayer section layered fracturing transformation or filling sand prevention, can effectively prevent fracturing sand and stratum framework sand from entering a shaft, and ensures long-term production of an oil-gas well.
Secondly, more layers of sections, even infinite layers of sections can be filled for sand prevention, the sand prevention effect is better, and the construction process is simpler and safer.
It should be noted that: the 1 st section of the door-closing reforming sliding sleeve a3, the 1 st section of the open hole packer a5, the 2 nd section of the door-closing reforming sliding sleeve a6, the 2 nd section of the open hole packer a8, the N th section of the door-closing reforming sliding sleeve a9 and the N th section of the open hole packer a11 all adopt the conventional equipment which is commercially available, and the structure of the conventional equipment is not described in detail herein.
The self-adaptive control screen pipe provided by the invention effectively combines the performance advantages of the oil pipe and the screen pipe under different conditions, realizes the performance of the oil pipe capable of bearing internal pressure and the performance of the screen pipe capable of seepage from outside to inside, and meets the requirements of reservoir reformation and long-term production of an oil gas well.
Example 2 the present invention differs from example 1 in that:
the annular valve 5 adopts an annular sliding sleeve, the inner wall and the outer wall of the annular sliding sleeve are respectively matched with the outer wall of the core tube 1 and the inner wall of the outer cylinder 3 through mechanical sealing, and the functions can be realized through a mechanical sealing structure.
Example 3 the present invention differs from example 1 in that:
the concentric double-tube structure of the core tube 1 and the outer tube 3 is adopted, an annulus valve 5 is arranged between the annulus of the core tube 1 and the annulus of the outer tube 3, the core tube 1 and the outer tube 3 are respectively divided into an upper section and a lower section, a first gap or hole 4 is arranged on the wall of the lower section of the core tube 1, the wall of the upper section of the core tube 1 is used as a sealing section, the wall of the lower section of the outer tube 3 is used as a sealing section, a second gap or hole 8 is arranged on the wall of the upper section of the core tube, so that a staggered structure is formed, and a lower limit support 13 is arranged at the lower ends of the core tube 1 and the outer tube 3; a limiting step 12 is arranged on the outer wall of the core tube 1; when the pressure in the core tube 1 is greater than the external pressure of the outer cylinder 3, the pressure in the core tube 1 is transmitted between the core tube 3 and the outer cylinder 3 through a first gap or hole of the core tube 1, the annular valve 5 is pushed to move to the limit step 12, the core tube sealing section, the annular valve and the outer cylinder sealing surface are combined together to form an internal pressure bearing sealing system, and at the moment, the internal pressure bearing and the internal pressure of the oil tube can be transmitted up and down; when the external pressure of the outer cylinder 3 is larger than the pressure in the core tube 1, the external pressure is transmitted between the core tube 1 and the outer cylinder 3 through a second gap or hole of the outer cylinder 3, the annulus valve 5 is pushed to be far away from the lower limit support 13 of the limit step 12, the second gap or hole of the outer cylinder, the first gap or hole of the core tube and the annulus of the core tube are combined together to form a circulation channel, external fluid enters the core tube 1, and the second gap or hole is used for blocking sand with large particle size or a sieve tube function of large solid.
The above description is only a few preferred embodiments of the present invention, and any person skilled in the art may make modifications to the above described embodiments or make modifications to the same. Therefore, any simple modification or equivalent made according to the technical solution of the present invention falls within the scope of the protection claimed by the present invention.
Claims (4)
1. An adaptive control screen pipe, characterized by: an annular valve (5) is arranged in an annular space between the core tube (1) and the outer cylinder (3) by adopting a concentric double-tube structure of the core tube (1) and the outer cylinder (3);
the core tube (1) and the outer tube (3) are respectively divided into an upper section and a lower section, a first gap or hole (4) is formed in the upper section tube wall of the core tube (1), the lower section tube wall of the core tube (1) is used as a sealing section, the upper section tube wall of the outer tube (3) is used as a sealing section, a second gap or hole (8) is formed in the lower section tube wall of the outer tube (3), so that a staggered structure is formed, and a limiting step (12) is formed in the outer wall of the core tube (1);
the annulus between the core tube (1) and the outer cylinder (3) is divided into an isolation annulus (9) and a liquid passing annulus (10) through an annulus valve (5);
when the pressure in the core tube (1) is greater than the external pressure of the outer cylinder (3), the pressure in the core tube (1) is transmitted between the core tube and the outer cylinder (3) through a first gap or hole of the core tube (1), the annular valve (5) is pushed to move to the limit step (12), the sealing section of the core tube, the annular valve and the sealing section of the outer cylinder are combined together to form an internal pressure-bearing sealing system, and at the moment, the internal pressure-bearing and the internal pressure of the oil tube are transmitted up and down; when the external pressure of the outer cylinder (3) is larger than the internal pressure of the core tube (1), the external pressure is transmitted between the core tube (1) and the outer cylinder (3) through a second gap or hole of the outer cylinder (3), the annular valve (5) is pushed to be far away from the limit step (12), the second gap or hole of the outer cylinder, the first gap or hole of the core tube and the annular between the core tube and the outer cylinder are combined together to form a circulation channel, external fluid is enabled to enter the core tube (1), the second gap or hole blocks sand with large particle size, and the function of a sieve tube is achieved during oil and gas production.
2. The adaptive control screen as recited in claim 1, wherein: the annular valve (5) adopts an annular piston, the inner wall and the outer wall of the annular piston are respectively provided with a second sealing ring (6) and a third sealing ring (7), the annular valve is sealed with the outer wall of the core tube (1) through the second sealing ring (6), and the annular valve is sealed with the inner wall of the outer cylinder (3) through the third sealing ring (7).
3. The adaptive control screen as recited in claim 1, wherein: the annular valve (5) adopts an annular sliding sleeve, and the inner wall and the outer wall of the annular sliding sleeve are respectively matched with the outer wall of the core tube (1) and the inner wall of the outer tube (3) through mechanical sealing.
4. A method of using the adaptive control screen of any one of claims 1-3, wherein: the method comprises the following two using processes:
(1) Oil pipe function: when the pressure of liquid or gas in the self-adaptive control sieve tube is higher than that of liquid or gas outside the self-adaptive control sieve tube, the pressure in the oil tube pushes the annular valve (5) to descend to the position of the limiting step (12) in the isolating annular space (9) through the first gap or hole (4) at the upper part of the core tube (1), so that a sealing section of the core tube (1), the annular valve (5) and a sealing section of the outer cylinder (3) form a sealing space to prevent liquid flow or gas flow from overflowing from the self-adaptive control sieve tube, and the liquid flow or gas flow can only descend along the inner wall of the core tube to play a role of the oil tube;
(2) Screen pipe function: when the pressure of liquid or gas outside the self-adaptive control sieve tube is higher than that in the self-adaptive control sieve tube, the pressure outside the outer tube (3) pushes the annular valve (5) to move upwards in the isolation annular space (9) through a second gap or hole (8) on the outer tube (3), so that the annular valve (5) is pushed to the end part of the isolation annular space (9), liquid flow or gas flow outside the self-adaptive control sieve tube firstly enters a liquid passing annular space (10) between the outer tube (3) and the core tube (1) through a second gap or hole (8) at the lower part of the outer tube (3), then enters an inner wall cavity of the core tube (1) through a first gap or hole (4) at the upper part of the core tube (1), communication from outside a tool to inside the tool is realized, and the second gap or hole (8) plays a role in sand prevention of the sieve tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289766.9A CN109931037B (en) | 2019-04-11 | 2019-04-11 | Self-adaptive control screen pipe and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289766.9A CN109931037B (en) | 2019-04-11 | 2019-04-11 | Self-adaptive control screen pipe and method |
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