CN112943177B - Variable-density pre-filled sieve tube and using method thereof - Google Patents
Variable-density pre-filled sieve tube and using method thereof Download PDFInfo
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- CN112943177B CN112943177B CN202110168612.1A CN202110168612A CN112943177B CN 112943177 B CN112943177 B CN 112943177B CN 202110168612 A CN202110168612 A CN 202110168612A CN 112943177 B CN112943177 B CN 112943177B
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- 230000001681 protective effect Effects 0.000 claims abstract description 100
- 239000004576 sand Substances 0.000 claims abstract description 54
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- 230000000903 blocking effect Effects 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 230000002829 reductive effect Effects 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 238000005192 partition Methods 0.000 claims description 50
- 230000008569 process Effects 0.000 claims description 22
- 230000000149 penetrating effect Effects 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 7
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- 230000000670 limiting effect Effects 0.000 claims description 5
- 210000002445 nipple Anatomy 0.000 claims description 3
- 239000003129 oil well Substances 0.000 claims description 2
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- 235000009496 Juglans regia Nutrition 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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Abstract
The invention relates to a variable density pre-filling sieve tube and a using method thereof, the variable density pre-filling sieve tube comprises a base tube, a plurality of first overflowing holes are arranged on the side wall of the base tube, a protective sleeve structure is sleeved outside the base tube, a filling annular space which is axially communicated is arranged in the protective sleeve structure, an ultralow density propping agent can be tightly filled in the filling annular space, two ends of the filling annular space are arranged in an opening manner, two ends of the protective sleeve structure on the base tube are respectively sleeved with an unlocking structure, each unlocking structure can seal the filling annular space from two ends, and each unlocking structure can move towards the direction far away from the protective sleeve structure under the action of annular space blocking pressure after blocking. The unlocking structures at the two ends of the protective sleeve structure can move towards the direction far away from the protective sleeve structure under the action of the annular blocking pressure after blocking, high-compactness filling on the ground of the pre-filled sieve tube can be realized, low-compactness filling is performed underground, sand control can be effectively controlled, the blockage of the sieve tube can be effectively reduced, and the contradiction between sand production and sand control is further effectively solved.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a variable-density pre-filled sieve tube and a using method thereof.
Background
In China, loose sandstone reservoirs occupy an important position, for example, a victory oil field in the Bohai region, a Liaohe oil field, a hong kong oil field, a Bohai oil field, a Jidong oil field and the like all have a large number of such reservoirs. Such reserves share some common features: shallow burial, weak cementing action and easy sand production in the mining process.
The mechanical screen pipe sand control is an important sand control mode and mainly comprises the following steps: slotted sieve tubes, high-quality sieve tubes, pre-filled sieve tubes and the like. Wherein: the high-quality sieve tube is suitable for homogeneous reservoirs and reservoirs with lower mud content, and has the defect that sand blocking media are easy to erode and damage, so that sand prevention is ineffective; the slotted screen pipe is simple to process and low in cost, but is easy to block, and due to the restriction of a processing technology, the sand prevention precision of the slotted screen pipe is limited, so that the slotted screen pipe is only suitable for reservoirs with coarse stratum sand granularity; the pre-filled sieve tube has the characteristics of a partial gravel filling sand prevention mode, is simple to process and convenient to run, is suitable for wells which are difficult to perform gravel filling operation or have high operation cost, such as long horizontal wells, ultra-long horizontal wells, highly-deviated wells and the like, and is found from field application conditions that the pre-filled sieve tube is easy to block, so that the productivity of an oil well is greatly reduced. This is mainly because the gravel packing in the gravel layer of the pre-packed screen is too dense, which leads to the reduction of the overflowing precision of the pre-packed screen, and the gravel layer where mud particles are easy to be retained leads to the blockage of the screen. If the gravel pack is loose, the gravel pack state in the screen pipe transportation process and the screen pipe descending process is difficult to guarantee, so that partial defect easily occurs, and the sand control is ineffective.
Therefore, the inventor provides the variable-density pre-filled sieve tube and the using method thereof by virtue of experience and practice of related industries for many years, the sieve tube is in a high-density filling state from the ground to the underground, after the sieve tube is blocked, the filling compactness of a gravel layer is reduced, argillaceous particles are produced, the sieve tube is effectively controlled to be blocked, and the aim of long-term and efficient development of offshore oil and gas fields is fulfilled.
Disclosure of Invention
The invention aims to provide a variable-density pre-filled sieve tube and a using method thereof, wherein unlocking structures at two ends of a protective sleeve structure can move towards a direction far away from the protective sleeve structure under the action of annular blocking pressure after blocking, high-compactness filling on the ground of the pre-filled sieve tube and low-compactness filling under a well can be realized, sand control can be effectively controlled, sieve tube blocking can be effectively reduced, and further the contradiction between sand production and sand control is effectively solved.
The variable-density pre-filling sieve tube comprises a hollow base tube, wherein a plurality of first overflowing holes which are communicated along the radial direction of the base tube are arranged on the side wall of the base tube at intervals, a protective sleeve structure is sleeved on the outer side of the base tube, a filling annular space which is communicated in the axial direction is arranged in the protective sleeve structure, an ultralow-density propping agent can be tightly filled in the filling annular space, two ends of the filling annular space are arranged in an opening mode, unlocking structures are respectively sleeved at two ends of the base tube, which are positioned on the protective sleeve structure, and can respectively seal the filling annular space from corresponding ends, and each unlocking structure can move towards the direction far away from the protective sleeve structure under the action of the annular space blocking pressure after blocking.
In a preferred embodiment of the present invention, the protective sheath structure includes an inner protective sheath sleeved on the base tube, an outer protective sheath is coaxially and radially sleeved on the outer side of the inner protective sheath, and the outer wall of the inner protective sheath and the inner wall of the outer protective sheath form the filling annulus therebetween; the interval sets up a plurality of second that radially link up along the parent tube and crosses the discharge orifice on the lateral wall of interior protective sheath, the interval sets up a plurality of third that radially link up along the parent tube and crosses the discharge orifice on the lateral wall of outer protective sheath, the lateral wall middle part interval of outer protective sheath sets up a plurality of encryption discharge orifices that radially link up along the parent tube, each encryption discharge orifice is used for making the current capacity at the middle part of variable density prefilled screen pipe be greater than the current capacity at both ends.
In a preferred embodiment of the present invention, the unlocking structure includes an inner sleeve sleeved on the base pipe, the outer side of the inner sleeve is coaxially and radially sleeved with an outer sleeve, a sleeve annulus is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve, a plugging plate is disposed at one end of the sleeve annulus far from the protective sleeve structure, and one end of the sleeve annulus close to the protective sleeve structure is communicated with the filling annulus; the inner sleeve is sleeved at one end of the inner protective sleeve, and the outer sleeve is sleeved at one end of the outer protective sleeve; the sleeve ring is internally provided with an annular partition plate capable of axially moving along the sleeve ring, the sleeve ring is internally sleeved with a spring, and two ends of the spring are respectively abutted against and connected with the annular partition plate and the plugging plate.
In a preferred embodiment of the present invention, a slider structure capable of limiting the movement of the annular partition is connected to the annular partition.
In a preferred embodiment of the present invention, the sliding block structure includes a first sliding block, a second sliding block, and a third sliding block, the outer sleeve is provided with a first installation hole penetrating along a radial direction of the base pipe, the annular partition is provided with a second installation hole penetrating the first installation hole, the inner sleeve is provided with a third installation hole penetrating the second installation hole, and the base pipe is provided with a positioning hole penetrating the third installation hole; the first sliding block can be slidably arranged in the first mounting hole in a penetrating way, the second sliding block can be slidably arranged in the first mounting hole and the second mounting hole in a penetrating way, and the third sliding block can be slidably arranged in the second mounting hole and the third mounting hole in a penetrating way; the first sliding block can push the second sliding block and the third sliding block to slide inwards under the action of external pressure.
In a preferred embodiment of the present invention, a first groove with an increased diameter is disposed at one end of the first installation hole away from the base pipe, a first step with an increased diameter is disposed at one end of the first slider away from the base pipe, and the first step can be sleeved in the first groove.
In a preferred embodiment of the present invention, the positioning hole is a stepped hole, an inner diameter of an end of the positioning hole close to the third mounting hole is the same as an inner diameter of the third mounting hole, and an inner diameter of an end of the positioning hole far from the third mounting hole is smaller than the inner diameter of the third mounting hole.
In a preferred embodiment of the present invention, a second groove with an increased diameter is disposed on an inner wall of the inner sleeve near one end of the inner protection sleeve, and one end of the inner protection sleeve is sleeved in the second groove; the outer sleeve is close to set up the third recess that the diameter is the increase setting on the inner wall of the one end of outer protective sheath, an pot head of outer protective sheath is located in the third recess.
In a preferred embodiment of the invention, the outer sleeve has an outer diameter dimension that is larger than an outer diameter dimension of the outer protective sheath.
The object of the invention can also be achieved by the use method of the variable density prepacked sieve tube, which comprises the following steps:
a. and (3) putting the assembled variable-density pre-filled sieve tube into the well:
b. after the variable-density pre-filled sieve tube is blocked in the well, under the action of blocking pressure, the sliding block structure slides inwards, the annular partition plate loses position limitation, and starts to move towards the direction of the blocking plate under the action of the tensile force of the spring, so that the filling space of the ultra-low-density proppant is enlarged;
c. because the annular partition plate moves, the holes among the ultralow-density proppants close to the annular partition plate are increased, meanwhile, fluid at the center of the base pipe begins to move to the holes at the two ends with small resistance, and the ultralow-density proppants filled at the middle position also begin to move to the two ends under the driving of the fluid, so that the overall filling compactness of the sieve pipe is reduced, the blockage of the variable-density pre-filled sieve pipe is removed, and the productivity of a sand producing well is maintained.
From the above, the variable density prepacked sieve tube and the use method thereof provided by the invention have the following beneficial effects:
according to the variable-density pre-filled sieve tube and the using method thereof, the unlocking structures at the two ends of the protective sleeve structure can move in the direction far away from the protective sleeve structure under the action of the annular blocking pressure after blocking, so that the accommodating space of the ultra-low-density proppant is enlarged, the filling compactness of the ultra-low-density proppant is reduced, argillaceous particles can be produced, the sieve tube blocking is effectively controlled, and the pre-filled sieve tube blocking and sand prevention effects are controlled; the ultra-low density proppant can move towards the position where the volumes of two ends are increased under the action of pressure and fluid power, so that the proppant can be uniformly filled in an annular space, the phenomena of local compactness and partial depletion are prevented, and if the proppant is directly filled in a loose manner on the ground, the depletion possibly occurs when the proppant is concentrated at one end and the other end of the sieve tube due to the vibration effect in the process of going into a well, so that the local sand control is disabled; the volume increasing part is positioned in the unlocking structure, and the inner sleeve and the outer sleeve of the unlocking structure have no communicated overflowing hole, so that the problem of sand production is avoided; the unlocking structure can prevent the screen pipe from deforming due to incompact filling in the well entering process;
the variable-density pre-filled sieve tube can realize high-compactness filling and low-compactness filling of the ground of the pre-filled sieve tube, the pre-filled sieve tube can be tightly filled on the ground, and the sieve tube is prevented from being affected by the well descending process and the transportation process to cause local vacancy of the sieve tube and cause sand production when the sieve tube is not tightly filled; in the underground, the variable-density pre-filled sieve tube can automatically adjust the filling compactness of the annular space of the pre-filled sieve tube by depending on the annular plugging pressure after plugging, so as to realize the control of the plugging of the sieve tube, effectively control the sand control, effectively reduce the plugging of the sieve tube and further effectively solve the contradiction between the sand production and the sand control.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
FIG. 1 is a schematic structural view of the variable density prepacked screen of the present invention.
FIG. 2 is an enlarged view of FIG. 1 taken at point I.
Fig. 3 is an enlarged view of the point i at the time of clogging.
Figure 4 is a schematic view of an inner protective sheath of the present invention.
Figure 5 is a schematic view of an outer protective sheath of the present invention.
Fig. 6 is a schematic view of the protective sheath structure and the unlocking structure of the present invention after connection.
Figure 7 is a cross-sectional view of the protective cover structure and the release structure of the present invention after attachment.
Fig. 8 is a schematic view of an unlocking structure of the present invention.
Fig. 9 is a schematic view of direction a in fig. 8.
FIG. 10 is a schematic view of the annular diaphragm and spring connection of the present invention.
FIG. 11 is a state diagram of the variable density prepacked screen of the present invention prior to downhole unlocking.
FIG. 12 is a diagram of the variable density prepacked screen of the present invention after it has been unlocked downhole.
Description of reference numerals:
100. pre-filling the screen pipe with variable density;
1. a base pipe; 11. a first overflow aperture;
2. a protective sleeve structure; 20. filling an annular space; 21. an inner protective sheath; 211. a second overflowing hole; 22. an outer protective sheath; 221. a third overflowing hole; 222. encrypting the overflowing hole;
3. an ultra-low density proppant;
4. an unlocking structure;
40. a sleeve annulus; 41. an inner sleeve; 411. a second groove; 42. an outer sleeve; 421. a third groove; 43. a plugging plate; 44. an annular partition plate; 45. a spring;
5. a slider structure;
51. a first slider; 52. a second slider; 53. a third slider;
61. a first mounting hole; 62. a second mounting hole; 63. a third mounting hole; 64. positioning holes;
91. the center of the base pipe; 92. an outer annulus; 93. a reservoir; 94. a wellbore; 95. a wellhead.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 12, the present invention provides a variable density pre-filled sieve tube 100, which includes a hollow base tube 1, a plurality of first overflowing holes 11 penetrating along a radial direction of the base tube are arranged at intervals on a sidewall of the base tube 1, a protective sleeve structure 2 is sleeved outside the base tube 1, an axially penetrating filling annulus 20 is arranged in the protective sleeve structure 2, an ultra-low density proppant 3 can be tightly filled in the filling annulus 20, the ultra-low density proppant 3 is a prior art, and includes polymer microspheres, resin-coated nut shells, walnut shells, hollow glass microspheres, hollow spheres or coated porous ceramsite, etc. The advantage of using ultra low density proppant is that it is easily moved by the intermediate fluid to the point where the volume increases at both ends. The both ends of filling annular space 20 are the opening setting, and the both ends that lie in protective sleeve structure 2 on parent tube 1 are overlapped respectively and are equipped with unlocking structure 4, and each unlocking structure 4 can seal from corresponding each end respectively and fill annular space 20, and each unlocking structure 4 can be moved to the direction of keeping away from protective sleeve structure 2 under the annular space after blockking up the pressure effect, and the accommodation space of ultralow density proppant 3 increases, and the closely knit degree of filling of ultralow density proppant 3 can reduce.
In the variable-density pre-filled sieve tube, the unlocking structures at the two ends of the protective sleeve structure can move towards the direction far away from the protective sleeve structure under the action of the annular blocking pressure after blocking, so that the accommodating space of the ultra-low-density proppant is enlarged, the filling compactness of the ultra-low-density proppant is reduced, argillaceous particles can be produced, the sieve tube blocking is effectively controlled, and the pre-filled sieve tube blocking and sand prevention effects are controlled; the ultra-low density proppant can move towards the position where the volumes of two ends are increased under the action of pressure and fluid power, so that the proppant can be uniformly filled in an annular space, the phenomena of local compactness and partial depletion are prevented, and if the proppant is directly filled in a loose manner on the ground, the depletion possibly occurs when the proppant is concentrated at one end and the other end of the sieve tube due to the vibration effect in the process of going into a well, so that the local sand control is disabled; the volume increasing part is positioned in the unlocking structure, and the inner sleeve and the outer sleeve of the unlocking structure have no communicated overflowing hole, so that the problem of sand production is avoided; the unlocking structure can prevent the screen pipe from deforming due to incompact filling in the well entering process; the variable-density pre-filled sieve tube can realize high-compactness filling and low-compactness filling of the ground of the pre-filled sieve tube, the pre-filled sieve tube can be tightly filled on the ground, and the sieve tube is prevented from being affected by the well descending process and the transportation process to cause local vacancy of the sieve tube and cause sand production when the sieve tube is not tightly filled; in the underground, the variable-density pre-filled sieve tube can automatically adjust the filling compactness of the annular space of the pre-filled sieve tube by depending on the annular plugging pressure after plugging, so as to realize the control of the plugging of the sieve tube, effectively control the sand control, effectively reduce the plugging of the sieve tube and further effectively solve the contradiction between the sand production and the sand control.
Further, as shown in fig. 1, 4 and 5, the protective casing structure 2 includes an inner protective casing 21 sleeved on the base pipe, an outer protective casing 22 is coaxially and radially sleeved outside the inner protective casing 21, and the aforementioned filled annulus 20 is formed between the outer wall of the inner protective casing 21 and the inner wall of the outer protective casing 22; the interval sets up a plurality of second overflow holes 211 that radially link up along base pipe 1 on the lateral wall of interior protective sheath 21, the interval sets up a plurality of third overflow holes 221 that radially link up along base pipe 1 on the lateral wall of outer protective sheath 22, the lateral wall middle part interval of outer protective sheath 22 sets up a plurality of encryption overflow holes 222 that radially link up along base pipe 1, each encryption overflow hole 222 is used for making the flow capacity at the middle part of variable density prefilled screen pipe be greater than the flow capacity at both ends, fluid through the screen pipe intermediate position gets into behind the gravel layer, trend to the screen pipe both ends motion, be favorable to driving 3 motions of density proppant.
Further, as shown in fig. 1, 7, 8, and 9, the unlocking structure 4 includes an inner sleeve 41 sleeved on the base pipe, an outer sleeve 42 is coaxially and radially sleeved outside the inner sleeve 41, a sleeve annulus 40 is formed between an outer wall of the inner sleeve 41 and an inner wall of the outer sleeve 42, a plugging plate 43 is disposed at one end of the sleeve annulus 40 away from the protection casing structure 2, and one end of the sleeve annulus 40 close to the protection casing structure 2 is communicated with the packing annulus 20; the inner sleeve 41 is sleeved on one end of the inner protection sleeve 21, and the outer sleeve 42 is sleeved on one end of the outer protection sleeve 22; an annular partition plate 44 capable of axially moving along the sleeve annulus 40 is arranged in the sleeve annulus 40, a spring 45 is sleeved in the sleeve annulus 40, and two ends of the spring 45 are respectively abutted against and connected to the annular partition plate 44 and the plugging plate 43. In one embodiment of the present invention, the number of springs 45 is 4. When installed at the surface, the initial state of the spring 45 in the sleeve annulus 40 is in a stretched state, and the spring 45 exerts a pulling force on the annular partition 44.
Further, as shown in fig. 1, 2, 3, 7, 8, and 9, the annular partition 44 is connected to a slider structure 5 capable of restricting the movement of the annular partition 44.
Further, as shown in fig. 2, 3, 7, and 8, the slider structure 5 includes a first slider 51, a second slider 52, and a third slider 53, the outer sleeve 42 is provided with a first mounting hole 61 penetrating along the radial direction of the base pipe, the annular partition 44 is provided with a second mounting hole 62 penetrating the first mounting hole 61, the inner sleeve 41 is provided with a third mounting hole 63 penetrating the second mounting hole 62, and the base pipe 1 is provided with a positioning hole 64 penetrating the third mounting hole 63; the first slider 51 is slidably arranged in the first mounting hole 61, the second slider 52 is slidably arranged in the first mounting hole 61 and the second mounting hole 62, and the third slider 53 is slidably arranged in the second mounting hole 62 and the third mounting hole 63; the first slider 51 can push the second slider 52 and the third slider 53 to slide inwards under the action of external pressure.
In the initial state after the variable density pre-filled sieve tube 100 is installed on the ground, the first slide block 51 is arranged in the first installation hole 61 in a penetrating manner, the second slide block 52 is arranged in the first installation hole 61 and the second installation hole 62 in a penetrating manner and is connected with the outer sleeve 42 and the annular partition plate 44, and the third slide block 53 is arranged in the second installation hole 62 and the third installation hole 63 in a penetrating manner and is connected with the annular partition plate 44 and the inner sleeve 41; when plugging occurs in a well, under the action of plugging pressure of an external annular space 92, the first slide block 51 pushes the second slide block 52 and the third slide block 53 to slide inwards (in the direction of the center 91 of the base pipe), when the second slide block 52 is completely positioned in the second mounting hole 62 of the annular partition plate 44, the third slide block 53 leaves the second mounting hole 62, the annular partition plate 44 loses position limitation, and starts to move towards the direction of the plugging plate 43 under the action of the pulling force of the spring 45, so that the filling space of the ultra-low density proppant 3 is increased, and the filling density of the pre-filled sieve pipe is reduced. As annular partition 44 moves, the voids between ultra-low density proppants 3 near annular partition 44 increase, causing the sand bridges formed near it to collapse, and fluid begins to move toward the low drag two-end voids at the center 91 of the base pipe. Under the drive of fluid, the ultralow-density proppant 3 filled in the middle also starts to move towards the two ends, so that the filling compactness of the ultralow-density proppant in the filled annulus 20 formed by the outer protective sleeve 22 and the inner protective sleeve 21 is changed.
The positioning hole 64 is used for positioning the installation positions of the annular partition plate 44 and the inner sleeve 41, and the positioning hole 64 can be used for transmitting the fluid pressure in the inner cavity of the base pipe 1 and the annular space 92 outside the variable density pre-filled sieve pipe 100, so that the inner side and the outer side of the sliding block structure 5 are subjected to equal liquid column pressure in the process of descending the variable density pre-filled sieve pipe 100 into the well, and the sliding block structure 5 is prevented from being unlocked after descending.
In one embodiment of the present invention, the number of the first mounting holes 61, the second mounting holes 62, the third mounting holes 63 and the positioning holes 64 is 4, and the slider structure is correspondingly 4 sets.
Further, the one end that base tube 1 was kept away from to first mounting hole 61 sets up the diameter and is the increase and sets up first recess, and the one end that base tube was kept away from to first slider 51 sets up the first step portion that the diameter is the increase and sets up, and first step portion can overlap and locate in the first recess.
Further, the positioning hole 64 is a stepped hole, the inner diameter of the end, close to the third mounting hole 63, of the positioning hole 64 is the same as the inner diameter of the third mounting hole 63, and the inner diameter of the end, far away from the third mounting hole 63, of the positioning hole 64 is smaller than the inner diameter of the third mounting hole 63.
Further, as shown in fig. 7, 8 and 9, a second groove 411 with an enlarged diameter is formed on an inner wall of the inner sleeve 41 near one end of the inner protection sleeve 21, and one end of the inner protection sleeve 21 is sleeved in the second groove 411; a third groove 421 with an enlarged diameter is formed on the inner wall of the end of the outer sleeve 42 close to the outer protection sleeve 22, and one end of the outer protection sleeve 22 is sleeved in the third groove 421.
Further, the outer sleeve 42 may have an outer diameter dimension that is larger than the outer diameter dimension of the outer protective sheath 22 and may be used as a centralizer. The inner diameter of the outer sleeve 42 is the same size as the inner diameter of the outer protective sheath 22; the inner sleeve 41 has an inner diameter the same as the inner diameter of the inner protective sheath 21 and is attached to the base pipe 1, and the inner sleeve 41 has an outer diameter smaller than the outer diameter of the inner protective sheath 21.
The assembly process of the variable density prepacked screen 100 of the present invention is as follows:
assembling and unlocking structure 4:
welding one end of the spring 45 on the plugging plate 43 and the other end of the spring 45 on the annular partition plate 44 (as shown in fig. 10), placing the annular partition plate 44 and the spring 45 in the sleeve annular space 40 between the inner sleeve 41 and the outer sleeve 42, and placing the spring 45 in a stretching state; adjusting the annular partition 44 to enable the second mounting hole 62 to correspond to the first mounting hole 61 and the third mounting hole 63, sequentially inserting the third slider 53, the second slider 52 and the first slider 51 into the mounting holes from outside to inside, wherein the first slider 51 is positioned in the first mounting hole 61, the second slider 52 is positioned in the first mounting hole 61 and the second mounting hole 62, the third slider 53 is positioned in the second mounting hole 62 and the third mounting hole 63, and the annular partition 44 is fixed in the sleeve annulus 40 to avoid movement under the tension of the spring 45; the plugging plate 43 is plugged and connected on the inner sleeve 41 and the outer sleeve 42;
(II) assembling the variable density prepacked screen 100:
the unlocking structure 4 of one end is connected with the protective sleeve structure 2: inserting one end of the outer protection sleeve 22 into the third groove 421 of an outer sleeve 42, inserting one end of the inner protection sleeve 21 into the second groove 411 of an inner sleeve 41, and welding the outer protection sleeve 22 at the joint of the outer sleeve 42;
filling the ultra low density proppant 3 through the other end opening of the protective jacket structure 2: under the action of mechanical vibration, filling the ultralow-density proppant 3 into a filling annulus 20 between the outer protective sleeve 22 and the inner protective sleeve 21;
connect the unlocking structure 4 of the other end with the protective sheath structure 2: inserting the other end of the outer protection sleeve 22 into the third groove 421 of the other outer sleeve 42, inserting the other end of the inner protection sleeve 21 into the second groove 411 of the other inner sleeve 41, and welding the outer protection sleeve 22 at the joint of the outer sleeve 42;
as shown in fig. 6 and 7, the protective sleeve structure 2 and the unlocking structures 4 at the two ends form a variable-density pre-filling sand control nipple;
sleeving the assembled variable-density pre-filled sand control nipple on the base pipe 1 to ensure that a positioning hole 64 in the base pipe 1 is communicated with a third mounting hole 63 in the inner sleeve 41;
and welding the end part of each inner sleeve 41 far away from the protective sleeve structure 2 and the base pipe 1 to finish the assembly.
The use method of the variable density prepacked screen pipe 100 of the invention is as follows:
a. the assembled variable density prepacked screen 100 is run into the well: in the process of descending the well, the liquid column pressure in the inner cavity of the base pipe 1 is equal to the liquid column pressure in the annular space 92 outside the variable density pre-filled sieve pipe 100, the liquid column pressure in the inner cavity of the base pipe 1 can be transmitted to the third sliding block 53 through the positioning hole 64 in the base pipe 1, and the liquid column pressure in the annular space outside the variable density pre-filled sieve pipe 100 is directly applied to the outer surface of the first sliding block 51. Because the liquid column pressures on the two sides of the first sliding block 51 and the third sliding block 53 are equal, the sliding block structure 5 does not move in the process of going into the well;
b. under the action of the blocking pressure, the sliding block structure 5 slides inwards, the annular partition plate 44 loses position limitation, and starts to move towards the direction of the blocking plate 43 under the action of the tensile force of the spring 45, so that the filling space of the ultra-low density proppant 3 is increased;
specifically, when not plugged, the variable density prepacked screen 100 is in an initial state, i.e., a pre-unlocked state, as shown in fig. 11, where 93 is the reservoir, 94 is the wellbore, and 95 is the wellhead;
after the variable density pre-filled sieve tube 100 is plugged in the well, the variable density pre-filled sieve tube 100 is in an unlocked state, as shown in fig. 12, the annular space 92 outside the variable density pre-filled sieve tube 100 gradually generates plugging pressure, under the action of the plugging pressure, the first slider 51 pushes the second slider 52 to move towards the annular partition plate 44, the second slider 52 pushes the third slider 53 to slide towards the positioning hole 64 on the base tube 1 (in the direction of the center 91 of the base tube), when the second slider 52 is completely positioned in the second mounting hole 62 of the annular partition plate 44, the annular partition plate 44 loses position limitation, under the action of the pulling force of the spring 45, the annular partition plate 43 starts to move towards the plugging plate 43, and the filling space of the ultra-low density proppant 3 is increased;
c. as the annular partition 44 moves, the local ultra-low density proppant pack space at the point of contact with the annular partition 44 increases and the voids between the ultra-low density proppants 3 near the annular partition 44 increase, causing the sand bridge formed near it to collapse and the fluid at the center 91 of the basepipe begins to move to the two-end voids with low resistance. Under the drive of fluid, the ultralow-density proppant 3 filled in the middle position also starts to move towards the two ends, so that the whole filling compactness of the sieve tube is reduced, a sand bridge formed on the surface of the variable-density pre-filled sieve tube 100 is damaged, the blockage removal of the variable-density pre-filled sieve tube 100 is realized, and the productivity of a sand producing well is maintained.
From the above, the variable density prepacked sieve tube and the use method thereof provided by the invention have the following beneficial effects:
in the variable-density pre-filled sieve tube, the unlocking structures at the two ends of the protective sleeve structure can move towards the direction far away from the protective sleeve structure under the action of the annular blocking pressure after blocking, so that the accommodating space of the ultra-low-density proppant is enlarged, the filling compactness of the ultra-low-density proppant is reduced, argillaceous particles can be produced, the sieve tube blocking is effectively controlled, and the pre-filled sieve tube blocking and sand prevention effects are controlled; the ultra-low density proppant can move towards the position where the volumes of two ends are increased under the action of pressure and fluid power, so that the proppant can be uniformly filled in an annular space, the phenomena of local compactness and partial depletion are prevented, and if the proppant is directly filled in a loose manner on the ground, the depletion possibly occurs when the proppant is concentrated at one end and the other end of the sieve tube due to the vibration effect in the process of going into a well, so that the local sand control is disabled; the volume increasing part is positioned in the unlocking structure, and the inner sleeve and the outer sleeve of the unlocking structure have no communicated overflowing hole, so that the problem of sand production is avoided; the unlocking structure can prevent the screen pipe from deforming due to incompact filling in the well entering process; the variable-density pre-filled sieve tube can realize high-compactness filling and low-compactness filling of the ground of the pre-filled sieve tube, the pre-filled sieve tube can be tightly filled on the ground, and the sieve tube is prevented from being affected by the well descending process and the transportation process to cause local vacancy of the sieve tube and cause sand production when the sieve tube is not tightly filled; in the underground, the variable-density pre-filled sieve tube can automatically adjust the filling compactness of the annular space of the pre-filled sieve tube by depending on the annular plugging pressure after plugging, so as to realize the control of the plugging of the sieve tube, effectively control the sand control, effectively reduce the plugging of the sieve tube and further effectively solve the contradiction between the sand production and the sand control.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (5)
1. A method for maintaining the productivity of a sand producing well by sand control and blockage control adopts a variable density pre-filled sieve tube which comprises a hollow base tube, a plurality of first overflowing holes which are radially communicated with the base tube are arranged on the side wall of the base tube at intervals,
a protective sleeve structure is sleeved on the outer side of the base pipe, an axially through filling annular space is arranged in the protective sleeve structure, and ultralow-density proppant can be tightly filled in the filling annular space;
the protective sleeve structure comprises an inner protective sleeve sleeved on the base pipe, the outer side of the inner protective sleeve is coaxial, an outer protective sleeve is sleeved at a radial interval, and a filling annulus is formed between the outer wall of the inner protective sleeve and the inner wall of the outer protective sleeve; the side wall of the inner protective sleeve is provided with a plurality of second overflowing holes which are communicated along the radial direction of the base pipe at intervals, the side wall of the outer protective sleeve is provided with a plurality of third overflowing holes which are communicated along the radial direction of the base pipe at intervals, the middle part of the side wall of the outer protective sleeve is provided with a plurality of encryption overflowing holes which are communicated along the radial direction of the base pipe at intervals, and each encryption overflowing hole is used for enabling the overflowing capacity of the middle part of the variable-density prefilled screen pipe to be larger than that of the two ends;
two ends of the filled annulus are arranged in an opening manner, and two ends of the base pipe, which are positioned on the protective sleeve structure, are respectively sleeved with an unlocking structure;
the unlocking structure comprises an inner sleeve sleeved on the base pipe, the outer side of the inner sleeve is coaxially sleeved with an outer sleeve at intervals in the radial direction, a sleeve annulus is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve, a plugging plate is arranged at one end, far away from the protective sleeve structure, of the sleeve annulus, and one end, close to the protective sleeve structure, of the sleeve annulus is communicated with the filling annulus; the inner sleeve is sleeved at one end of the inner protective sleeve, and the outer sleeve is sleeved at one end of the outer protective sleeve; an annular partition plate capable of moving axially along the sleeve annulus is arranged in the sleeve annulus, a spring is sleeved in the sleeve annulus, and two ends of the spring are respectively abutted against and connected to the annular partition plate and the plugging plate;
the annular partition plate is connected with a sliding block structure capable of limiting the movement of the annular partition plate, the sliding block structure comprises a first sliding block, a second sliding block and a third sliding block, the outer sleeve is provided with a first mounting hole which is communicated with the base pipe in the radial direction, the annular partition plate is provided with a second mounting hole which is communicated with the first mounting hole, the inner sleeve is provided with a third mounting hole which is communicated with the second mounting hole, and the base pipe is provided with a positioning hole which is communicated with the third mounting hole; the first sliding block can be slidably arranged in the first mounting hole in a penetrating way, the second sliding block can be slidably arranged in the first mounting hole and the second mounting hole in a penetrating way, and the third sliding block can be slidably arranged in the second mounting hole and the third mounting hole in a penetrating way; the first sliding block can push the second sliding block and the third sliding block to slide inwards under the action of external pressure;
each unlocking structure can seal the filled annulus from each corresponding end, and each unlocking structure can move in the direction far away from the protective sleeve structure under the action of the plugging pressure of the plugged annulus;
it is characterized by comprising:
assembling and unlocking structure: welding one end of the spring on the plugging plate, welding the other end of the spring on the annular partition plate, and placing the annular partition plate and the spring in a sleeve annulus between the inner sleeve and the outer sleeve to enable the spring to be in a stretching state; adjusting an annular partition plate to enable a second mounting hole to correspond to a first mounting hole and a third mounting hole, sequentially inserting a third sliding block, a second sliding block and the first sliding block into the mounting holes from outside to inside, wherein the first sliding block is positioned in the first mounting hole, the second sliding block is positioned in the first mounting hole and the second mounting hole, the third sliding block is positioned in the second mounting hole and the third mounting hole, and the annular partition plate is fixed in the sleeve annulus to avoid moving under the action of spring tension; connecting the plugging plate on the inner sleeve and the outer sleeve in a plugging manner;
(II) assembling the variable-density prepacked sieve tube: the unlocking structure and the protective sleeve structure of one end are firstly connected: inserting one end of the outer protective sleeve into a third groove of an outer sleeve, inserting one end of the inner protective sleeve into a second groove of an inner sleeve, and welding the outer protective sleeve at the joint of the outer sleeve;
filling an ultra-low density proppant through the other end opening of the protective sleeve structure: under the action of mechanical vibration, filling the ultralow-density proppant into a filling annulus between the outer protective sleeve and the inner protective sleeve;
with the unlocking structure and the protective sheath structural connection of the other end: inserting the other end of the outer protective sleeve into a third groove of the other outer sleeve, inserting the other end of the inner protective sleeve into a second groove of the other inner sleeve, and welding the outer protective sleeve at the joint of the outer sleeves;
the protective sleeve structure and the unlocking structures at the two ends form a variable-density pre-filling sand-prevention short section;
sleeving the variable-density pre-filled sand control nipple on a base pipe to ensure that a positioning hole in the base pipe is communicated with a third mounting hole in the inner sleeve;
welding the end part of each inner sleeve, which is far away from the protective sleeve structure, with the base pipe to complete the assembly of the variable-density pre-filled sieve pipe;
(III) the assembled variable density prepacked screen pipe is put into the well: in the process of descending the well, the liquid column pressure of the inner cavity of the base pipe is equal to the liquid column pressure of the annular space outside the variable density pre-filled sieve pipe, the liquid column pressure of the inner cavity of the base pipe can be transmitted to the third sliding block through the positioning hole in the base pipe, and the liquid column pressure of the annular space outside the variable density pre-filled sieve pipe directly acts on the outer surface of the first sliding block;
fourthly, under the action of the plugging pressure, the sliding block structure slides inwards, the annular partition plate loses position limitation, and starts to move towards the direction of the plugging plate under the action of the tensile force of the spring, so that the filling space of the ultra-low density proppant is enlarged; if not, the variable density pre-filled sieve tube is in an initial state, namely a pre-unlocking state: if the variable density pre-filled sieve tube is blocked in the well, the variable density pre-filled sieve tube is in an unlocked state, the annular space outside the variable density pre-filled sieve tube gradually generates blocking pressure, the first sliding block pushes the second sliding block to move towards the annular partition plate under the action of the blocking pressure, the second sliding block pushes the third sliding block to slide towards the positioning hole on the base tube, when the second sliding block is completely positioned in the second mounting hole of the annular partition plate, the annular partition plate loses position limitation, the second sliding block starts to move towards the direction of the blocking plate under the action of the pulling force of the spring, the filling space of the density proppant is enlarged, the filling compactness of the density proppant is reduced, the output of argillaceous particles can be realized, the sieve tube blockage is effectively controlled, more importantly, the ultra-low density proppant can move towards the position where the volumes of two ends are increased under the action of pressure and fluid power, and the uniform filling of the proppant in the annular space is realized, the phenomena of very dense local part and empty local part are prevented, the occurrence of local sand control failure is prevented, and effective sand control can be realized;
fifthly, as the annular partition moves, the filling space of the local ultra-low density proppant at the contact part of the annular partition is increased, and the pores among the ultra-low density proppants close to the annular partition are increased, so that a sand bridge formed nearby is collapsed, and meanwhile, the fluid at the center of the base pipe begins to move to the pores at two ends with small resistance; the ultralow-density propping agent filled in the middle position also starts to move towards two ends under the driving of fluid, the variable-density pre-filled sieve tube automatically adjusts the filling compactness of the annular space of the pre-filled sieve tube by means of the annular plugging pressure after plugging, the overall filling compactness of the sieve tube is reduced, so that a sand bridge formed on the surface of the variable-density pre-filled sieve tube is damaged, and the plugging removal of the variable-density pre-filled sieve tube is realized;
and (VI) not only can effectively prevent sand, but also can effectively reduce the blockage of the sieve tube, thereby effectively solving the contradiction between sand production and sand prevention and maintaining the productivity of the sand production oil well.
2. The method of claim 1, wherein the end of the first installation hole away from the base pipe is provided with a first groove with an increased diameter, the end of the first slide block away from the base pipe is provided with a first step part with an increased diameter, and the first step part can be sleeved in the first groove.
3. The method of claim 1, wherein the positioning hole is provided as a stepped hole, an inner diameter of an end of the positioning hole close to the third mounting hole is provided as same as an inner diameter of the third mounting hole, and an inner diameter of an end of the positioning hole far from the third mounting hole is provided as smaller than the inner diameter of the third mounting hole.
4. The method of claim 1, wherein a second groove with an increased diameter is formed on an inner wall of the inner sleeve near an end of the inner protection sleeve, and an end of the inner protection sleeve is sleeved in the second groove; the outer sleeve is close to set up the third recess that the diameter is the increase setting on the inner wall of the one end of outer protective sheath, an pot head of outer protective sheath is located in the third recess.
5. The method of claim 1, wherein an outer diameter dimension of the outer sleeve is greater than an outer diameter dimension setting of the outer protective casing.
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