CN111502623A - Tubular sand washing and steam injection device and process - Google Patents
Tubular sand washing and steam injection device and process Download PDFInfo
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- CN111502623A CN111502623A CN202010382725.7A CN202010382725A CN111502623A CN 111502623 A CN111502623 A CN 111502623A CN 202010382725 A CN202010382725 A CN 202010382725A CN 111502623 A CN111502623 A CN 111502623A
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- washing
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- 239000004576 sand Substances 0.000 title claims abstract description 147
- 238000005406 washing Methods 0.000 title claims abstract description 128
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 239000003129 oil well Substances 0.000 claims abstract description 31
- 238000011010 flushing procedure Methods 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000003921 oil Substances 0.000 description 93
- 238000005086 pumping Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 239000000295 fuel oil Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 241000191291 Abies alba Species 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
Abstract
The invention discloses a tubular sand-washing steam-injection device and a process, wherein the device comprises a two-channel pump, the lower part of the two-channel pump is connected with a tubular sand-washing steam-injection tool, the tubular sand-washing steam-injection tool comprises an oil-well pump, and the lower end of the oil-well pump is connected with an oil-sealing steam pipe and a sand-washing outer pipe; an oil inlet hole is formed in the side surface of the oil inlet steam sealing pipe, and a steam sealing and removing connecting pipe is installed inside the oil inlet steam sealing pipe; the side surface of the sand washing outer pipe is provided with uniform through holes; the uniform through holes are arranged on the periphery of the sand washing outer pipe along the circumferential direction, and the uniform through holes with different sizes are formed at different depth positions; the process is that sand impurities in a tail pipe and at the bottom of an oil layer are washed clean through a positive well flushing; and washing out the sand grains layer by layer through the uniform through holes. Then, uniformly injecting steam into each oil layer through the uniform through holes; during steam injection, steam does not pass through the inner wall of the pump barrel of the oil well pump, so that scale blockage after steam injection is avoided; after steam injection, the pump inlet impurities are few, and the pump is not easy to clamp; the invention has the advantages that: realizes stable, high-efficiency and energy-saving production.
Description
Technical Field
The invention relates to a sand washing and well washing device before steam injection of a heavy oil well and a related process, in particular to a tubular sand washing and steam injection device and a process, belonging to the field of steam injection of the heavy oil well.
Background
In a sucker rod production well of a heavy oil well, there are the following problems:
first, impurities such as sand reduce the pumping efficiency and shorten the life: during the oil pumping process, the formation oil flows towards the oil well pump, sand is also brought to the vicinity of the oil well pump by the oil flow, and the sand is gradually deposited due to high density, so that the sand surface moves upwards. When the depth of accumulated sand reaches a certain degree, the liquid inlet of an oil well pump is insufficient, air lock is pumped out, and even the production is stopped and the pump is detected due to dry grinding;
secondly, steam injection and scaling are easy to block the pump: in the production of heavy oil well, steam is injected into underground by steam huff-puff process, and oil extraction is carried out after soaking. However, the traditional injection and pumping dual-purpose pump comprises a feedback pump and a double oil inlet pump, when steam is injected, steam passes through an inner hole of a pump cylinder, and if scale is formed on the inner wall of the pump cylinder, the scale of a plunger piston is blocked when rotary pumping is performed;
thirdly, the well washing depth is not enough: and the double oil inlet pumps inject steam through the openings on the side surfaces of the pump cylinders, and sand impurities below the fixed valve cannot be washed in the well washing process. When the pumping is changed, the pumping efficiency is low and the sand is easy to block;
fourthly, blocking a well washing channel: a plurality of tail pipes are connected below the oil well pump, and when a well is washed, if sand particles in the tail pipes are fully accumulated, the well washing liquid cannot be washed through, so that the well washing fails, steam cannot be injected, and the oil extraction pipe is required to be overhauled;
fifthly, the oil pipe annulus is not thoroughly washed: if steam is injected after directly washing the well through the tail pipe, part of impurities can be left because the annular flushing of the tail pipe is not uniform. Reduce the permeability of steam in the oil layer, even block the steam injection channel, and reduce the steam benefit. After steam injection, the sand layer is hardened, and the oil well pump is dry-ground after rotary pumping, so that production stop maintenance is needed, and the steam injection cost is wasted. Missing the best oil recovery opportunity.
Disclosure of Invention
In order to solve the problems, the invention designs the tubular sand washing and steam injecting device and the tubular sand washing and steam injecting process, the well washing depth is large, the circumferential sand cleaning rate is high, the steam injection permeability of an oil layer is improved, and stable, efficient and energy-saving production is realized.
The technical scheme of the invention is as follows:
a kind of tubular sand washing steam injection apparatus, including the double channel pump, the inferior part of said double channel pump connects with the tubular sand washing steam injection tool, the said tubular sand washing steam injection tool includes the oil-well pump, the said lower end of oil-well pump connects into the oil seal steam pipe, sand washing outer pipe;
the side surface of the oil inlet steam sealing pipe is provided with an oil inlet hole, a steam sealing and removing connecting pipe is arranged in the oil inlet steam sealing pipe and used for blocking the oil inlet hole, the outer diameter of the steam sealing and removing connecting pipe is matched with the inner diameter of the oil inlet steam sealing pipe and can slide up and down along the oil inlet steam sealing pipe, and the upper end and the lower end of the oil inlet steam sealing pipe are provided with limiting plugs used for limiting the sliding distance of the steam sealing and removing connecting pipe; the oil inlet hole is positioned at the upper part of the oil inlet sealing steam pipe, when the steam sealing and removing connecting pipe slides to the upper part of the oil inlet hole 31, the oil inlet hole is blocked, and when the steam sealing and removing connecting pipe slides to the lower part of the oil inlet hole, the oil inlet hole is separated from the oil inlet hole, so that the oil inlet hole is opened;
the side surface of the sand washing outer pipe is provided with uniform through holes; the equal-measuring through holes are arranged on the periphery of the sand washing outer pipe along the circumferential direction, and the equal-measuring through holes with different sizes are formed in positions with different depths.
Wherein, the equal volume through-hole from top to bottom aperture crescent, and the opening direction is inequality, because steam is come from oil pipe upper portion, so from the heat source nearest minimum of equal volume through-hole design, down a little more, the steam volume that the equal volume through-hole of co-altitude can make is more even down, the bottom is the biggest again. The steam passes through the annular space between the pump barrel and the outer pipe and does not pass through the inner wall of the pump barrel.
Furthermore, the oil well pump is provided with an oil extraction assembly, the oil extraction assembly comprises a plunger part and a pump barrel part, and the plunger part is connected with the sucker rod string through a pull rod; the lower part of the oil extraction assembly is connected with a sand washing inner pipe; the sand washing inner pipe is provided with an elastic boss, the inner side surface of the steam sealing release connecting pipe is provided with a groove matched with the elastic boss, and the elastic boss is hermetically matched with the steam sealing release connecting pipe to realize the functions of lifting up to close the oil inlet hole and lowering to open the oil inlet hole.
The sucker rod string is formed by connecting a plurality of sucker rods from a wellhead polished rod to the underground, and during installation, a leather cup assembly at the lower part of the pump cylinder assembly is positioned at the bottom of the outer pipe in a seat sealing mode by lowering the sucker rod string. Under the matching of the plunger part and the pump barrel part, the pumping force is generated by the up-and-down reciprocating motion of the plunger, and the oil is conveyed to the ground.
Furthermore, the double-channel pump is provided with a bridge type steam injection assembly, the upper end part of the bridge type steam injection assembly is connected with an oil pipe column, and the lower end part of the bridge type steam injection assembly is connected with the sand washing outer pipe.
The tubing string runs from the wellhead up to the downhole pump, usually by a plurality of tubing strings connected by threads. The function is to communicate the well mouth and the oil layer and to convey oil, well-flushing fluid and steam.
Furthermore, a sand washing steam injection channel is arranged between the sand washing inner pipe and the sand washing outer pipe, when the oil well pump is lifted up, the oil well pump drives the sand washing inner pipe to move upwards together, a sand layer cavity is formed at the lower part of the sand washing inner pipe, and an initial channel is provided for sand washing and well washing.
The sand washing outer pipe is used for guiding the flowing direction of media such as oil flow, well washing liquid, steam and the like. And the well washing in layers and the steam injection are realized by matching with the uniform-measuring through holes.
The sand washing inner pipe is connected to the lower part of the oil extraction assembly and is used for guiding the flow direction of media such as oil flow, well washing liquid, steam and the like.
Furthermore, the lower end part of the sand washing outer pipe is also sleeved with a telescopic pipe, when steam is injected, the whole oil string is heated and can axially extend, so that the whole oil string can be bent, in order to prevent bending, a safe distance needs to be reserved between the tail end of the oil string and the bottom of the artificial well, and sand washing depth can be influenced, so that sand washing is incomplete; through setting up flexible pipe, can inwards stretch out and draw back, when first installation, the outer tube assembly can be transferred to the end, has guaranteed that the well-flushing is thorough.
In addition, the upper end part of the telescopic pipe is provided with an outer edge, the inner side of the lower end part of the sand washing outer pipe is provided with an inner edge corresponding to the outer edge, and the telescopic pipe is limited in the sand washing outer pipe by the arrangement of the inner edge and the outer edge so as to avoid falling off. And a sealing ring is arranged between the telescopic pipe and the sand washing outer pipe, so that the sealing effect is realized. The sealing ring may be disposed at the inner edge and in contact with the outer wall of the extension tube.
A process for the tubular sand washing and steam injecting device comprises the following steps:
(1) when the bottom of the oil well pump is blocked by sand, the sucker rod string is lifted up, and the oil extraction assembly is lifted into the bridge type steam injection assembly of the dual-channel pump and is centered;
when the sucker rod string is lifted upwards, the elastic lug boss on the sand washing inner pipe drives the steam sealing and releasing connecting pipe to move upwards together, the steam sealing and releasing connecting pipe is limited at the limiting plug, the sucker rod string is continuously lifted upwards after the steam sealing and releasing connecting pipe is limited and stopped, and the sand washing inner pipe cooperates with the oil well pump to move upwards together;
the sand washing and steam injection channel is opened, and meanwhile, sand grains are forcibly driven to move upwards due to the lifting of the sand washing inner pipe, a sand grain cavity is formed in the original accumulated sand, so that the original tighter sand layer becomes loose under the driving of the sand washing inner pipe, and the washing is convenient;
(2) washing the sand grains at the bottom completely through a positive well washing, and washing the sand grains layer by layer from top to bottom through the uniform through holes;
after sand impurities are cleaned, uniformly injecting steam into each oil layer through the uniform-quantity through holes; because the uniform through holes are buried by sand at different depths and have different flow resistances, the sand grains are washed away layer by layer in sequence from bottom to top;
because the equal amount of through-hole is crescent from top to bottom aperture along the vertical direction, and the opening direction is inequality, because steam is come from oil pipe upper portion, so from the heat source nearest minimum of equal amount of through-hole design, down big a little again, the biggest of bottom to can make the steam volume that the equal amount of through-hole of co-altitude passes through more even. The steam passes through the annular space between the pump barrel and the outer pipe and does not pass through the inner wall of the pump barrel.
(3) After steam injection, the sucker rod is lowered down, and the anti-impact distance is adjusted, so that oil can be pumped.
The invention has the beneficial effects that: washing sand impurities in the tail pipe and at the bottom of an oil layer through a positive well flushing; and washing out the sand grains layer by layer through the uniform through holes. Then, uniformly injecting steam into each oil layer through the uniform through holes; when steam is injected, the steam does not pass through the inner wall of the pump barrel of the oil well pump, so that scale blockage after steam injection is avoided. After steam injection, the pump inlet impurities are few, and the pump is not easy to clamp; the well washing depth is large, the circumferential sand cleaning rate is high, the permeability of injected steam of an oil layer is improved, and stable, efficient and energy-saving production is realized.
The invention is further illustrated by the following figures and examples.
Drawings
FIG. 1 is a schematic structural diagram of a matching device for a sand washing and steam injection process of a heavy oil well in an embodiment of the invention;
FIG. 2 is a schematic structural view of the oil well pump according to the embodiment of the present invention when the bottom of the oil well pump is clogged with sand;
FIG. 3 is a structural state diagram of the sand-washing steam-injection passage according to the embodiment of the invention;
FIG. 4 is a state diagram of a configuration for forming a grit chamber according to an embodiment of the present invention;
FIG. 5 is a state diagram of sand washing and steam injection according to an embodiment of the present invention;
FIG. 6 is a state diagram after steam injection according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a tubular sand-washing steam-injection device with a telescopic pipe according to an embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
As shown in fig. 1, a tubular sand washing and steam injecting device comprises a two-channel pump 1, wherein the lower part of the two-channel pump 1 is connected with a tubular sand washing and steam injecting tool, and the tubular sand washing and steam injecting tool has the specific structure that: the lower end of the oil well pump is connected with an oil seal steam pipe 3 and a sand washing outer pipe 4;
an oil inlet hole 31 is formed in the side face of the oil-sealed steam pipe 3, a steam-sealing and connecting pipe 32 is installed in the oil-sealed steam pipe 3 and used for blocking the oil inlet hole 3, the outer diameter of the steam-sealing and connecting pipe 32 is matched with the inner diameter of the oil-sealed steam pipe 3 and can slide up and down along the oil-sealed steam pipe 3, and limiting plugs are arranged at the upper end and the lower end of the oil-sealed steam pipe 3 and used for limiting the sliding distance of the steam-sealing and connecting pipe 32; the oil inlet hole 31 is positioned at the upper part of the oil inlet and oil sealing steam pipe 3, when the steam sealing and removing connecting pipe 32 slides to the upper part of the oil inlet hole 31, the oil inlet hole 31 is blocked, and when the steam sealing and removing connecting pipe 32 slides to the lower part of the oil inlet hole 31, the oil inlet hole 31 is separated from the oil inlet hole 31, so that the oil inlet hole 31 is opened;
the side surface of the sand washing outer pipe 4 is provided with uniform through holes 41; the equal-measuring through holes are arranged on the periphery of the sand washing outer pipe along the circumferential direction, and the equal-measuring through holes with different sizes are formed in positions with different depths.
Wherein, the equal volume through-hole from top to bottom aperture crescent, and the opening direction is inequality, because steam is come from oil pipe upper portion, so from the heat source nearest minimum of equal volume through-hole design, down a little more, the steam volume that the equal volume through-hole of co-altitude can make is more even down, the bottom is the biggest again. The steam passes through the annular space between the pump barrel and the outer pipe and does not pass through the inner wall of the pump barrel.
The oil well pump is provided with an oil extraction assembly 2, the oil extraction assembly 2 comprises a plunger part and a pump barrel part, and the plunger part is connected with a sucker rod string 6 through a pull rod; the lower part of the oil extraction assembly 2 is connected with a sand washing inner pipe 5; the sand washing inner pipe 5 is provided with an elastic boss 51, the inner side surface of the steam sealing and releasing connecting pipe 32 is provided with a groove corresponding to the elastic boss 51, and the elastic boss 51 and the steam sealing and releasing connecting pipe 32 are in airtight fit to realize the functions of lifting to close an oil inlet and lowering to open the oil inlet.
The sucker rod string 6 is a string formed by connecting a plurality of sucker rods from a wellhead polished rod to the underground, and during installation, a leather cup assembly at the lower part of the pump cylinder assembly is positioned at the bottom of the outer pipe in a seat sealing mode by lowering the sucker rod string 6. Under the matching of the plunger part and the pump barrel part, the pumping force is generated by the up-and-down reciprocating motion of the plunger, and the oil is conveyed to the ground.
The double-channel pump 1 is provided with a bridge type steam injection assembly, the upper end part of the bridge type steam injection assembly is connected with an oil pipe column 7, and the lower end part of the bridge type steam injection assembly is connected with the sand washing outer pipe 4.
A tubing string 7 runs from the wellhead up to the downhole pump, typically by a plurality of tubing strings connected by threads. The function is to communicate the well mouth and the oil layer and to convey oil, well-flushing fluid and steam.
A sand washing steam injection channel is arranged between the sand washing inner pipe 5 and the sand washing outer pipe 4, when the oil well pump is lifted, the oil well pump drives the sand washing inner pipe 5 (central pipe) to move upwards together, a sand layer cavity 8 is formed at the lower part of the sand washing inner pipe, and an initial channel is provided for sand washing and well washing.
The sand washing outer pipe is used for guiding the flowing direction of media such as oil flow, well washing liquid, steam and the like. And the well washing in layers and the steam injection are realized by matching with the uniform-measuring through holes.
The sand washing inner pipe is connected to the lower part of the oil extraction assembly and is used for guiding the flow direction of media such as oil flow, well washing liquid, steam and the like.
As shown in fig. 7, the lower end of the sand washing outer pipe 4 is further sleeved with a telescopic pipe 9, when steam is injected, the whole oil string is heated and axially extended, so that the whole oil string is bent, in order to prevent bending, a safe distance needs to be reserved between the tail end of the oil string and the bottom of the artificial well, and sand washing depth is affected, so that sand washing is incomplete; through setting up flexible pipe 9, can inwards stretch out and draw back, when first installation, the outer tube assembly can be transferred to the end, has guaranteed that the sand washing well-flushing is thorough.
In addition, the upper end part of the extension tube 9 is provided with an outer edge, the inner side of the lower end part of the sand washing outer tube 4 is provided with an inner edge corresponding to the outer edge, and the extension tube 9 is limited in the sand washing outer tube 4 by the arrangement of the inner edge and the outer edge so as to avoid falling off. And a sealing ring 42 is arranged between the extension tube 9 and the sand washing outer tube 4, so that the sealing effect is realized. The sealing ring may be arranged at the inner edge and in contact with the outer wall of the extension tube 9.
A process for the tubular sand washing and steam injecting device comprises the following steps:
(1) when the bottom of the oil well pump is blocked by sand, as shown in figure 2, the sucker rod string 6 is lifted up, the oil extraction assembly 2 is lifted into the bridge type steam injection assembly of the dual-channel pump 1, and the oil extraction assembly is centered;
when the sucker rod string 6 is lifted up, the elastic lug boss 51 on the sand washing inner pipe 5 drives the steam sealing and releasing connecting pipe 32 to move upwards together, and the steam sealing and releasing connecting pipe 32 is limited at the position of the limiting plug;
after stopping, continuing to lift the sucker rod string 6, and enabling the sand washing inner pipe 5 to go upwards together with the oil well pump (lifting the sucker rod string 6 out of the well mouth, the oil extraction assembly and the sand washing inner pipe can be overhauled, and sand production conditions of an oil layer can be analyzed through sand samples in the sand washing inner pipe);
the sand washing and steam injection channel is opened, and meanwhile, sand grains are forcibly driven to move upwards due to the lifting of the sand washing inner pipe 5, and a sand grain cavity (sand layer cavity) 8 is formed in the original accumulated sand, so that the original tighter sand layer becomes loose under the driving of the sand washing inner pipe 5, and the washing is convenient, as shown in fig. 3-4;
(2) washing the sand at the bottom through a positive well washing, and washing the sand layer by layer from top to bottom through the uniform through holes 41, as shown in fig. 5;
and (3) positive well flushing: and injecting a well flushing fluid through an opening of the oil pipe on the Christmas tree. And the flushing fluid returns to the ground from the annular space between the oil pipe and the casing after passing through the oil layer.
And (3) backwashing the well: the flushing fluid is injected through an opening in the christmas tree through the casing. And the oil returns to the ground from the inner hole of the oil pipe after reaching the oil layer through the annular space between the oil pipe and the sleeve.
After sand impurities are cleaned, steam is uniformly injected into each oil layer through the uniform through holes 41; because the uniform through holes are buried by sand at different depths and have different flow resistances, the sand grains are washed away layer by layer in sequence from bottom to top;
because the equal through-hole from top to bottom aperture crescent along the vertical direction, and the opening direction is inequality, because steam is come from oil pipe upper portion, so from the heat source nearest minimum of equal through-hole design, down big a little again, the biggest of bottom, concrete aperture is confirmed according to oil reservoir sand production condition and well depth. Therefore, the steam quantity passing through the uniform quantity through holes with different heights is uniform. The steam passes through the annular space between the pump barrel and the outer pipe and does not pass through the inner wall of the pump barrel.
(3) After steam injection, the sucker rod is lowered down, the anti-impact distance is adjusted, and oil pumping is started, as shown in fig. 6.
Claims (8)
1. Tubular sand washing and steam injection device, its characterized in that: the device comprises a double-channel pump, wherein the lower part of the double-channel pump is connected with a tubular sand and steam flushing tool, the tubular sand and steam flushing tool comprises an oil well pump, and the lower end of the oil well pump is connected with an oil seal steam pipe and a sand flushing outer pipe; an oil inlet hole is formed in the side surface of the oil inlet steam sealing pipe, and a steam sealing and removing connecting pipe is installed inside the oil inlet steam sealing pipe; the side surface of the sand washing outer pipe is provided with uniform through holes; the equal-measuring through holes are arranged on the periphery of the sand washing outer pipe along the circumferential direction, and the equal-measuring through holes with different sizes are formed in positions with different depths.
2. The kit of claim 1, wherein: equal volume through-hole from top to bottom aperture crescent, and the opening direction is inequality.
3. The kit of claim 1, wherein: the oil well pump is provided with an oil extraction assembly, the oil extraction assembly comprises a plunger part and a pump barrel part, and the plunger part is connected with the sucker rod string through a pull rod; the lower part of the oil extraction assembly is connected with a sand washing inner pipe; and an elastic boss is arranged on the sand washing inner pipe and is in airtight fit with the steam sealing disconnecting pipe, so that the oil inlet hole is closed by lifting up and opened by lowering down.
4. The kit of claim 1, wherein: the double-channel pump is provided with a bridge type steam injection assembly, the upper end part of the bridge type steam injection assembly is connected with an oil pipe column, and the lower end part of the bridge type steam injection assembly is connected with the sand washing outer pipe.
5. The kit of claim 1, wherein: a sand washing and steam injecting channel is arranged between the sand washing inner pipe and the sand washing outer pipe; when the oil well pump is lifted up, the oil well pump drives the sand washing inner pipe to move upwards together, and a sand layer cavity is formed at the lower part of the sand washing inner pipe.
6. The kit as claimed in any one of claims 1 to 5, wherein: and the lower end part of the sand washing outer pipe is also sleeved with a telescopic pipe.
7. The kit of claim 6, wherein: the upper end of the telescopic pipe is provided with an outer edge, the inner side of the lower end of the sand washing outer pipe is provided with an inner edge corresponding to the outer edge, and a sealing ring is arranged between the telescopic pipe and the sand washing outer pipe.
8. A process for use in a tubular sand washing and steam injection apparatus according to any one of claims 1 to 7, comprising the steps of:
(1) when the bottom of the oil well pump is blocked by sand, the sucker rod string is lifted up, and the oil extraction assembly is lifted into the bridge type steam injection assembly of the dual-channel pump;
when the sucker rod string is lifted upwards, the elastic lug boss on the sand washing inner pipe drives the steam sealing and releasing connecting pipe to move upwards together, the steam sealing and releasing connecting pipe is limited at the limiting plug, the sucker rod string is continuously lifted upwards after the steam sealing and releasing connecting pipe is limited and stopped, and the sand washing inner pipe cooperates with the oil well pump to move upwards together;
the sand washing and steam injection channel is opened, and meanwhile, sand grains are forcibly driven to move upwards due to the lifting of the sand washing inner pipe, and a sand grain cavity is formed in the original accumulated sand, so that the original tighter sand layer becomes loose under the driving of the sand washing inner pipe;
(2) washing the sand grains at the bottom completely through a positive well washing, and washing the sand grains layer by layer from top to bottom through the uniform through holes;
after sand impurities are cleaned, uniformly injecting steam into each oil layer through the uniform-quantity through holes; because the uniform through holes are buried by sand at different depths and have different flow resistances, the sand grains are washed away layer by layer in sequence from bottom to top;
(3) after steam injection, the sucker rod is lowered down, and the anti-impact distance is adjusted, so that oil can be pumped.
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| CN202010382725.7A CN111502623A (en) | 2020-05-08 | 2020-05-08 | Tubular sand washing and steam injection device and process |
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| CN202010382725.7A CN111502623A (en) | 2020-05-08 | 2020-05-08 | Tubular sand washing and steam injection device and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240187A (en) * | 2020-08-25 | 2021-01-19 | 克拉玛依红山油田有限责任公司 | Sand washing, blockage removing and steam injecting tool |
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