CN113494267A - Oil-gas-water well leak-point plugging operation method - Google Patents
Oil-gas-water well leak-point plugging operation method Download PDFInfo
- Publication number
- CN113494267A CN113494267A CN202010191728.2A CN202010191728A CN113494267A CN 113494267 A CN113494267 A CN 113494267A CN 202010191728 A CN202010191728 A CN 202010191728A CN 113494267 A CN113494267 A CN 113494267A
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- mortar
- oil
- pipe column
- sleeve
- operation pipe
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- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 85
- 238000003801 milling Methods 0.000 claims abstract description 82
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 3
- 230000008023 solidification Effects 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 9
- 239000003129 oil well Substances 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000011440 grout Substances 0.000 description 6
- 238000005553 drilling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
Images
Classifications
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides an oil-gas-water well leak source plugging operation method which can solve the problems of low operation efficiency and high cost when an oil well leak source is plugged in the prior art. The oil-gas-water well leak source plugging operation method comprises the following steps: 1) connecting a sleeve cutter head on the oil pipe to form an operation pipe column; 2) lowering the operation pipe column to a position corresponding to the leakage point and washing the well; 3) injecting mortar and displacing liquid into the operation pipe column to push the mortar to sequentially pass through the oil pipe and the milling head so that the mortar is displaced to be below a leaking point; 4) lifting the operation pipe column to wait for mortar solidification; 5) forming an isolation ash plug after the mortar is solidified, and lowering an operation pipe column to verify the position of the isolation ash plug; 6) after the position of the isolation cement plug is verified, the operation pipe column is lifted to the position above the leakage point, the oil sleeve annulus channel is closed, and mortar and displacement liquid are injected into the operation pipe column to extrude the mortar into the leakage point in the air of the oil sleeve ring; 7) and (4) lowering the operation pipe column and cleaning the extrusion blocking ash plug and the isolation ash plug formed by the mortar by using the milling teeth on the sleeve milling head.
Description
Technical Field
The invention relates to the technical field of well repair processes, in particular to an oil-gas-water well leak source plugging operation method.
Background
In the prior art, the casing in the oil well can generate holes and cracks due to fluid erosion corrosion and electrochemical reaction of surface shallow water, and normal oil production of the oil well is influenced. In order to repair the leakage point on the casing, an operator can adopt a mode of injecting ash and filling a drill plug. Specifically, the cement injection string is lowered into the casing, the cement is placed into the casing, the cement covers the leaking points on the casing, the leaking points can be filled when the cement is solidified, and the cement injection operation is completed. And when the mortar is solidified, a cement plug for blocking the inner space of the casing can be formed in the casing, and in order to ensure the normal use of the oil well, an operator can put a drilling plug pipe column in the casing to remove the cement plug in the pipe column, so that the drilling and plugging operation is completed.
When the ash injection pipe column finishes the ash injection operation, the ash injection pipe column needs to be lifted out of the sleeve, after mortar is solidified, the drill plug pipe column is placed to clear the cement plug, and two times of pipe columns are needed to finish all operation tasks, so that the efficiency is low, and the production cost is increased.
Disclosure of Invention
The invention aims to provide an oil-gas-water well leak point plugging operation method which can solve the problems of low operation efficiency and high cost when plugging a leak point in an oil well or a gas well in the prior art.
In order to achieve the purpose, the oil-gas-water well leak source plugging operation method adopts the following technical scheme:
the oil-gas-water well leak source plugging operation method comprises the following steps:
1) connecting a sleeve cutter head on the oil pipe to form an operation pipe column;
2) lowering the operation pipe column to a position corresponding to the leakage point, and then performing well washing operation;
3) injecting the prepared mortar into an operation pipe column, and injecting a displacement liquid into the operation pipe column to push the mortar to pass through an oil pipe and a milling head in sequence, so that the mortar is displaced to a design position below a leakage point;
4) lifting the operation pipe column to wait for mortar solidification;
5) forming an isolation ash plug after the mortar is solidified, and lowering an operation pipe column to verify the position of the isolation ash plug;
6) after the position of the isolation ash plug is verified, the operation pipe column is lifted to the position above the leakage point, the oil sleeve annular channel is closed, the prepared mortar is injected into the operation pipe column again, and displacement liquid is injected into the operation pipe column to push the mortar to pass through the oil pipe and the sleeve milling head in sequence, so that the mortar is squeezed into the leakage point in the air of the oil sleeve ring;
7) and after the mortar forms the extrusion plugging ash plug, lowering the operation pipe column to the extrusion plugging ash plug, rotating the operation pipe column to clean the extrusion plugging ash plug and the isolation ash plug formed by the mortar by using the milling teeth on the sleeve milling head, and injecting a well washing liquid into the operation pipe column in the sleeve milling process so that the well washing liquid carries the debris generated in the sleeve milling process to return upwards through the oil sleeve annulus.
The beneficial effects are that: the sleeve milling head is connected to the oil pipe, the sleeve milling head can be matched with the oil pipe to complete ash injection operation by using the characteristic that the sleeve milling head can flow through, and the sleeve milling of the isolation ash plug and the extrusion ash plug can be completed by using the characteristic that the sleeve milling head can perform sleeve milling on hard objects.
Further, the radial size of the mortar channel for mortar to pass through in the milling head set is 30mm-40 mm.
The beneficial effects are that: the mortar channel of the milling head is 30-40mm, so that the blockage accident caused by the undersize channel in the ash injection process can be avoided, and the operation reliability is ensured.
Furthermore, the milling head is provided with an internal thread section connected with an oil pipe, the radial size of the internal thread section is larger than that of a mortar channel in the milling head, and a transition inclined plane is formed between the internal thread section and the mortar channel.
The beneficial effects are that: a transition inclined plane is arranged between the internal thread section and the mortar channel and can guide mortar to flow, so that the mortar is prevented from being blocked in the milling head, and the stable and reliable operation is ensured.
Furthermore, the bottom of the sleeve milling head is provided with a through-flow groove, and the through-flow groove is in a sector ring shape with a narrow inner part and a wide outer part along the axial projection of the sleeve milling head, so that the flushing fluid can flow into the air of the oil sleeve ring.
The beneficial effects are that: set up the through-flow groove into fan ring shape, can increase the liquid area of crossing that leads to the trough, improve and carry the piece ability of returning upward, reduce the piece deposit, guarantee that the operation normally goes on.
Further, the bottom of the milling head is provided with milling teeth formed by tungsten steel blocks.
The beneficial effects are that: the tungsten-plated steel block is used for forming the milling teeth, so that the operation is convenient and the cost is low.
Further, the setting time of the mortar in the step 4) and the step 7) is not less than 24 hours.
The beneficial effects are that: compared with the prior art, the method shortens the waiting time on the premise of ensuring that mortar can be completely solidified, reduces the operation time and improves the operation efficiency.
Drawings
FIG. 1 is a schematic view of mortar replacement in the method for plugging the leakage point of an oil-gas-water well according to the present invention;
FIG. 2 is a schematic diagram of a working string waiting for setting in the oil-gas-water well leak-point plugging operation method of the invention;
FIG. 3 is a partial cross-sectional view of a milling head used in the leak source plugging operation method of the oil gas well of the present invention;
FIG. 4 is a schematic bottom structure view of a milling head used in the oil-gas-water well leaking point plugging operation method of the present invention;
in the figure: 10-a sleeve; 11-oil jacket annulus; 20-operating the pipe column; 21-oil pipe; 22-set milling head; 221-internal thread section; 222-mortar channel; 223-grinding and milling teeth; 224-a through flow groove; 225-tungsten steel blocks; 226-drainage slots; 30-displacing liquid; 40-mortar; 41-isolating the ash plug.
Detailed Description
The specific implementation of the method for plugging the leakage point of the oil-gas-water well in the invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 4, an embodiment of the plugging operation method for the leak point of the oil-gas-water well in the invention is as follows: the method for plugging the leakage point of the oil-gas-water well mainly comprises two parts, namely plugging the leakage point in the casing 10 by using mortar 40 and removing an isolation mortar plug 41 formed by the mortar 40 by using a milling tool. Specifically, the operation method comprises the following steps:
the method comprises the following steps: the milling head 22 shown in fig. 3 and 4 is connected to the oil pipe 21, the oil pipe 21 and the milling head 22 form the working string 20 for completing the leak-point plugging operation, and the top of the working string 20 is connected with other strings.
Step two: the well connected operation pipe column 20 is placed into the casing 10, after the operation pipe column 20 reaches the set position, the bottom of the operation pipe column 20, namely the position of the milling head 22 is lower than the position of the upper leakage point of the casing 10, and the well washing liquid is introduced into the operation pipe column 20. The casing 10 is filled with clean water when the well is washed.
Step three: the prepared mortar 40 is injected into the working string 20, and the displacement liquid 30 capable of ejecting the mortar 40 from the working string 20 is injected into the working string 20, as shown in fig. 1, the mortar 40 in the working string 20 is positioned below the displacement liquid 30, and the mortar 40 is discharged from the mortar channel 222 of the milling cutter under the hydraulic pressure by continuously injecting the displacement liquid 30, and is deposited on the bottom of the working string 20 due to the high density of the mortar 40. The displacement fluid 30 in the work string 20 displaces the grout 40 to the design location such that the grout 40 is below the leak-off point on the casing 10. Then, the operator can inject a flushing fluid into the oil casing annulus 11, clean the passage in the operation pipe string 20 by a reverse circulation mode, and can carry a part of the redundant mortar 40 to the ground surface during the flushing process, and in this step, clear water can be used as the displacement fluid 30 and the flushing fluid during the backwashing process.
Step four: the work string 20 is lifted up, the casing head 22 on the work string 20 is pulled out from the mortar 40, and as shown in fig. 2, the casing head 22 moves to a set position above the mortar surface, and waits until the mortar 40 is solidified, and the setting time of the mortar 40 is 24 hours.
Step five: after mortar 40 sets, an isolation plug 41 is formed, at which time the operator must lower work string 20 to verify the location of isolation plug 41.
Step six: after the position of the isolation ash plug 41 is verified, the operating string 20 is lifted to the position above the leak point, the oil sleeve annulus passage is closed, and at the moment, the liquid in the oil sleeve annulus cannot return to the ground through the oil sleeve annulus passage. The operator injects mortar into the working string 20 again, injects displacement fluid into the working string 20 to push the mortar downward, passes the mortar through the oil pipe 21 and the milling head 22 in order, and the mortar injected thereafter enters the oil jacket annulus 11 because the mortar cannot go downward due to the blockage of the isolation plug 41. The operator continues to inject displacement fluid into the work string 20 which squeezes the grout into the leak-off points, at which point the leak-off points on the casing 10 are filled.
Step seven: after waiting 24 hours, the later injected mortar forms a plug on the plug 41, and the subsequent process requires cleaning the plug 41 and plug formed by the mortar in the casing 10, because the milling head 22 on the working string 20 is provided with milling teeth, the working string 20 is directly lowered without replacing a drilling plug string specially used for drilling plug, the working string 20 is driven to rotate, the milling head 22 rotates and moves downwards, during the milling process, the bottom of the milling head 22 is always attached to the upper surface of the isolating ash plug 41, the bottom of the casing milling head 22 is also provided with a through flow groove 224, an operator can inject clean water serving as well washing liquid into the operation pipe string 20 in the casing milling process, the well washing liquid can flow from the operation pipe string 20 to the oil casing annulus 11 through the through flow groove 224, the flow can carry debris generated during the casing milling process back up to the surface through the oil jacket annulus 11.
The structure of the milling head 22 used in the working string 20 is shown in fig. 3 and 4, the milling head 22 is a sleeve body in an integral structure, and has an inner cavity, an inner thread is processed on an inner wall surface of the inner cavity close to one end of the oil pipe 21 and used for being in threaded connection with the oil pipe 21, and an inner thread section 221 of the milling head 22 is formed at a part matched with the oil pipe 21. Below the internal thread section 221 is a mortar passage 222 for mortar 40 to pass through, and the radial dimension of the mortar passage 222 is smaller than that of the internal thread section 221, and 35mm is selected in this embodiment. A transition slope for transitioning the difference in radial dimension between the grout passage 222 and the internally threaded section 221 enables the grout 40 to be guided as the grout 40 flows. The mortar passageway 222 of the casing head of the work string 20 is in communication with the central passageway of the tubing 21 and mortar 40 can flow into the well through the tubing 21 and the casing head 22 in sequence.
The milling teeth 223 which are arranged at intervals are convexly arranged on the outer peripheral surface of the sleeve milling head 22 corresponding to the mortar channel 222, tungsten steel blocks 225 which are used as milling teeth are plated on the end surface of the sleeve milling head 22, the area of the end surface of the sleeve milling head 22 in the radial direction is increased by the milling teeth 223, the arrangement space of the milling teeth can be correspondingly increased to increase the milling area of the milling teeth, and the processing efficiency of the sleeve milling head 22 in the sleeve milling process is improved. The two adjacent milling teeth 223 enclose a drainage groove 226 for guiding the flow of the mortar 40, the flushing fluid or the displacing fluid 30, and the mortar 40 can flow downwards along the drainage groove 226 when the milling head 22 is pulled out of the mortar 40, so that the risk of pipe column clamping is reduced; the flow directing slots 226 can direct the flow of displacement fluid 30 or flushing fluid as it travels up.
The end face of the sleeve milling head 22 is further provided with through-flow grooves 224 arranged at intervals, the through-flow grooves 224 are groove splitting structures and can be communicated with the inner side space and the outer side space of the sleeve milling head 22, when the sleeve milling head 22 conducts sleeve milling on the isolation ash plug 41 formed by mortar 40, the end portion of the sleeve milling head 22 is attached to the surface of the isolation ash plug 41, well washing liquid flows into the oil sleeve annular space 11 through the through-flow grooves 224 and carries chips generated in the sleeve milling process to return to the ground, the projection of the through-flow grooves 224 in the axial direction of the sleeve milling head 22 is fan-shaped, and the size of a notch close to the outer side is larger than that of a notch close to the inner side.
In the above embodiments, the leak point on the casing in the oil well is filled, and in other embodiments, the leak point of the casing in the gas well can be filled by using the oil-gas-water well leak point plugging operation method of the present invention.
In other embodiments, diamond may be coated on the milling head or PDC cutting teeth may be embedded on the milling head to form milling teeth, but not limited to the tungsten-plated steel block.
In other embodiments, the radial dimension of the mortar channel may be 30mm, 40mm or a value in the range of 30-40mm, but is not limited to only setting the radial dimension of the mortar channel to 35 mm.
In other embodiments, the shape of the through-flow groove may also be rectangular, cylindrical, etc., without being limited to a fan-shaped ring.
In other embodiments, a step surface can be used as a transition between the internal thread section and the mortar channel.
In other embodiments, the mortar may have a setting time of greater than 24 hours, such as 30 hours, 36 hours, etc., which may ensure that the mortar is more fully set.
The above-mentioned embodiments, the objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The oil-gas-water well leak source plugging operation method is characterized by comprising the following steps:
the method comprises the following steps:
1) connecting a sleeve cutter head on the oil pipe to form an operation pipe column;
2) lowering the operation pipe column to a position corresponding to the leakage point, and then performing well washing operation;
3) injecting the prepared mortar into an operation pipe column, and injecting a displacement liquid into the operation pipe column to push the mortar to pass through an oil pipe and a milling head in sequence, so that the mortar is displaced to a design position below a leakage point;
4) lifting the operation pipe column to wait for mortar solidification;
5) forming an isolation ash plug after the mortar is solidified, and lowering an operation pipe column to verify the position of the isolation ash plug;
6) after the position of the isolation ash plug is verified, the operation pipe column is lifted to the position above the leakage point, the oil sleeve annular channel is closed, the prepared mortar is injected into the operation pipe column again, and displacement liquid is injected into the operation pipe column to push the mortar to pass through the oil pipe and the sleeve milling head in sequence, so that the mortar is squeezed into the leakage point in the air of the oil sleeve ring;
7) and after the mortar forms the extrusion plugging ash plug, lowering the operation pipe column to the extrusion plugging ash plug, rotating the operation pipe column to clean the extrusion plugging ash plug and the isolation ash plug formed by the mortar by using the milling teeth on the sleeve milling head, and injecting a well washing liquid into the operation pipe column in the sleeve milling process so that the well washing liquid carries the debris generated in the sleeve milling process to return upwards through the oil sleeve annulus.
2. The oil-gas-water well leak point plugging operation method as claimed in claim 1, wherein: the radial size of a mortar channel for mortar to pass through in the milling head set is 30-40 mm.
3. The oil-gas-water well leak point plugging operation method according to claim 1 or 2, characterized in that: the sleeve milling head is provided with an internal thread section connected with an oil pipe, the radial size of the internal thread section is larger than that of a mortar channel in the sleeve milling head, and a transition inclined plane is formed between the internal thread section and the mortar channel.
4. The oil-gas-water well leak point plugging operation method according to claim 1 or 2, characterized in that: the bottom of the sleeve milling head is provided with a through flow groove, and the through flow groove is in a sector ring shape with a narrow inner part and a wide outer part along the axial projection of the sleeve milling head, so that the flushing fluid flows into the air of the oil sleeve ring.
5. The oil-gas-water well leak point plugging operation method according to claim 1 or 2, characterized in that: the bottom of the milling head is provided with milling teeth formed by tungsten steel blocks.
6. The oil-gas-water well leak point plugging operation method according to claim 1 or 2, characterized in that: the setting time of the mortar in the step 4) and the step 7) is not less than 24 hours.
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| CN202010191728.2A CN113494267B (en) | 2020-03-18 | 2020-03-18 | Oil-gas-water well leakage point plugging operation method |
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| CN202010191728.2A CN113494267B (en) | 2020-03-18 | 2020-03-18 | Oil-gas-water well leakage point plugging operation method |
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