CN114961632A - Underground three-level environment-friendly treatment method for difficult and complicated well - Google Patents
Underground three-level environment-friendly treatment method for difficult and complicated well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 46
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000000246 remedial effect Effects 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 6
- 238000011221 initial treatment Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
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- 238000012544 monitoring process Methods 0.000 abstract description 4
- 239000003129 oil well Substances 0.000 abstract description 2
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- 230000000903 blocking effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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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
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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
- E21B43/11—Perforators; Permeators
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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Abstract
The invention relates to a underground three-level environment-friendly treatment method for a difficult and complicated well, which relates to the field of oil well treatment and comprises the following steps of S1: the first-stage treatment, drilling a treatment well, colliding the treatment well with a target well above a necessary covering layer, and squeezing cement into the annular space of the casing pipe for plugging; step S2: secondary treatment, wherein the treatment well is accompanied with the target well, a necessary capping layer is collided with the target well, a window is opened, and cement is squeezed into the sleeve of the target well and the annular space of the sleeve for plugging; step S3: and (3) performing three-stage treatment, namely performing subsection perforation on the accompanying section, and squeezing cement at the perforation to plug the inner part of the target well casing and the annular space of the casing. The beneficial effects of the invention are: a new treatment well is drilled in a preset range near the coordinates of the well mouth of the old difficult well, cement is extruded for three times from the inner space and the outer space of the target well casing pipe of the sealing layer on the upper part of the fluid overflow layer, and a complete trap is reconstructed, so that the aim of environment-friendly treatment is fundamentally fulfilled. The treatment well can be used as a monitoring channel subsequently, and when the target well has a problem again, secondary treatment can be carried out through the treatment well again.
Description
Technical Field
The invention relates to the field of oil well treatment, in particular to a three-level environment-friendly underground treatment method for a difficult and complicated well.
Background
In the later development stage of oil fields, the quality and strength of casings and the cementing quality of cement outside the casings are reduced to different degrees due to the influence of factors such as long service life, corrosion and abrasion of shaft casings, perforation and the like of a large number of old wells, and gas leakage inside and outside the casings and interlayer gas blowby occur. Particularly in a loose stratum, overflowed oil and water are gathered into a large pit on the ground to cause the collapse of a well mouth, the traditional shaft overhaul operation cannot be re-entered, the ground treatment index is not the primary reason, and a novel treatment means is urgently needed to thoroughly block the upward-flowing fluid.
Disclosure of Invention
The invention aims to solve the technical problem of how to thoroughly block the old well.
The technical scheme for solving the technical problems is as follows: a underground three-level environment-friendly treatment method for a difficult and complicated well comprises the following steps:
step S1: the method comprises the following steps of primary treatment, drilling a treatment well within a preset range from a target well, wherein the treatment well is arranged above a necessary sealing layer and collides with the target well, and cement is squeezed from the treatment well to a casing ring of the target well for plugging;
step S2: secondary treatment, wherein the treatment well and the target well are drilled downwards along with each other, the necessary sealing layer collides with the target well, a target well casing in the target well is windowed, and cement is injected into the casing annulus in the casing of the target well and near the windowing point for plugging;
step S3: and performing third-level treatment, namely performing sectional perforation on the target well casing by the treatment well in an area where the treatment well and the target well accompany, and squeezing cement at the perforation to plug the inner part of the target well casing and the annular space of the casing.
The invention has the beneficial effects that: the primary treatment aims at secondarily sealing a cement sheath of the target well and avoiding air leakage from the space of the casing sheath. And secondary treatment simultaneously plugs the inside and the outside of the target well casing pipe at the position needing to be covered and cuts off bottom airflow. And the third-level treatment utilizes sectional perforation and squeeze cement to suppress and block the target well in the accompanying section, so that the blocking effect is enhanced.
The invention drills a new treatment well in a preset range near the coordinates of the wellhead of the old difficult well, cement is extruded and injected for three times from the inner space and the outer space of the target well casing pipe of the sealing layer on the upper part of the fluid overflow layer, the upper part is blocked, the lower part is cut, the middle section is reinforced, a complete trap is reconstructed, and the aim of environment-friendly treatment is fundamentally realized. The treatment well can be used as a monitoring channel subsequently, and when the target well has a problem again, secondary treatment can be carried out through the treatment well again.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in step S1, drilling a treatment well within a preset range from the target well, where the treatment well collides with the target well above the necessary capping layer, specifically:
and drilling an upper borehole of a well governing borehole in a preset range of a target well, wherein the upper borehole collides with the target well above a necessary capping layer, and a first casing is arranged in the upper borehole.
The beneficial effect of adopting the further scheme is that: the first casing is used for cementing wells, so that subsequent downhole operation is facilitated.
Further, in step S2, the treating well and the target well are drilled downward together, and the step of colliding the necessary capping layer with the target well includes:
and a first whipstock is put into the first sleeve, an outlet of the first whipstock deviates from the target well, a forging and milling pipe column is put into the first sleeve, a lower part of the first sleeve is cut off to form an exposed well section, the forging and milling pipe column is replaced by a drill column, the exposed well section and the target well are drilled downwards along with one another to form a lower well bore of the treatment well bore, and the lower well bore is in the state that the necessary sealing layer collides with the target well.
The beneficial effect of adopting the further scheme is that: the first whipstock may serve to anchor the azimuth and provide a point of support, and the forge and mill string forge and mill the first casing under the steering and supporting action of the first whipstock for subsequent string sidetracking and formation of the lower wellbore.
Further, in step S2, windowing the casing of the target well, specifically:
and arranging a second sleeve at the lower part of the treatment well, and putting a second whipstock into the second sleeve, wherein the outlet of the second whipstock faces the target well, and putting a windowing tool into the target well sleeve in the target well to window and repair the window.
The beneficial effect of adopting the further scheme is that: the reaction force after the drill bit contacts the target well casing may make it difficult for the drill bit to apply weight-on-bit. And (3) a second casing is put into the lower borehole for well cementation, and the windowing tool has enough supporting force to complete windowing and window repairing under the supporting and guiding effects of the second whipstock.
Further, in step S2, cement is squeezed into the casing annulus inside the casing of the target well and near the windowing point to perform plugging, specifically:
a small-size pipe column is put into the treatment well, enters the target well casing from a window, and is judged whether to reach the bottom of the target well casing;
if the small-size tubular column reaches the bottom of the target well casing, continuously cementing from the bottom of the well to a windowing point through the small-size tubular column, and squeezing cementing to the casing annulus near the windowing point for plugging;
and if the small-size pipe column does not reach the bottom of the target well casing, squeezing cement into the target well casing and the casing annulus near a windowing point through the small-size pipe column for plugging.
The beneficial effect of adopting the further scheme is that: the small-scale tubular column tries to re-enter the well bottom, and cement plugging is carried out in the target well casing and the casing annulus.
Further, in step S3, the treating well performs staged perforation to the target well casing, specifically:
step S31, a directional perforating pipe column is put in;
and step S32, after a section of perforation is opened to the target well casing, moving the oriented perforation pipe column upwards or downwards, then opening a section of perforation to the target well casing, and repeating the operation until a preset section of perforation is opened.
The beneficial effect of adopting the further scheme is that: and perforating is arranged by utilizing the directional perforating pipe column to communicate the target well casing and the casing annulus, so that cement can be extruded to the middle part of the target well casing conveniently.
Further, in the step S1 and the step S2, a distance between the abatement well and the target well is measured by using a magnetic ranging technique during the drilling process of the abatement well, so as to determine a drilling direction of the abatement well.
The beneficial effect of adopting the further scheme is that: the magnetic distance measuring technology can accurately position the distance between the treatment well and the target well, and the drilling direction is determined according to the detected distance.
Further, the magnetic distance measurement and the drilling of the treatment well are carried out alternately.
Further, in the step S1, the preset range is a range in which magnetic ranging is detectable.
Drawings
FIG. 1 is a schematic structural diagram of a target well and a treatment well of the underground three-level environmental protection treatment method for a problematic well of the invention;
FIG. 2 is a schematic diagram illustrating the operation of the present invention in step S1 of annular casing cementing from the treatment well to the target well;
FIG. 3 is a schematic diagram illustrating the operation of the swage string cutting off the underside of the first sleeve to form a bared wellbore section of step S2 of the present invention;
FIG. 4 is a schematic diagram of the structure of the remedial well of step S2 of the present invention in which the critical capping layer collides with the target well;
FIG. 5 is a schematic structural diagram of the windowing and trimming process in step S2 according to the present invention;
FIG. 6 is a schematic structural diagram of a small-sized tubular string of step S2 according to the present invention;
FIG. 7 is a schematic diagram of the perforating string of step S3 of the present invention;
FIG. 8 is a flow chart of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
100. a ground surface; 101. a first earth formation; 102. a second earth formation; 103. a third earth formation;
1. a target well bore;
2. a target well casing; 201. a pit;
3. a casing annulus; 4. a large pit; 5. a target well head; 6. a drilling machine;
7. treating a well bore; 701. an upper wellbore; 702. a lower wellbore;
8. a first stage remediation operation zone; 801. a first sleeve; 802. squeezing a cement pipe column; 803. cement; 804. a weak location; 805. a first whipstock; 806. forging and milling a pipe column; 807. forging a milling cutter; 808. exposing a well section;
9. a second stage remediation operation zone; 901. a drill string; 902. a screw; 903. a drill bit; 904. a second sleeve; 905. a second whipstock; 906. milling a cone; 907. a small-sized pipe string; 908. a primer;
10. a third stage remediation operation zone; 1001. orienting a perforating string; 1002. a perforating charge; 1003. a tunnel.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1 to 8, this embodiment provides a method for treating underground three-level environmental protection of a suspicious well, which includes the following steps:
step S1: primary treatment; drilling a treatment well within a preset range from a target well, wherein the treatment well collides with the target well at a certain distance above a necessary sealing layer, and cement is squeezed from the treatment well to a casing annulus 3 of the target well for plugging;
step S2: secondary treatment; the treatment well and the target well are drilled downwards along with each other, the necessary covering layer is collided with the target well, a window is opened on a target well casing 2 in the target well, and cement is squeezed and injected into the casing annulus 3 in the target well casing 2 and near the window opening point for plugging;
step S3: performing third-level treatment; in the area where the remedial well accompanies the target well, the remedial well is perforated towards the target well casing 2 in a segmented mode, and cement squeezing is carried out at the perforated position to seal the interior of the target well casing 2 and the casing annulus 3.
In this embodiment, the primary remediation objective is to secondarily seal the cement sheath of the target well and prevent gas flow from leaking out of the casing annulus 3. And the secondary treatment simultaneously plugs the inside and the outside of the target well casing 2 at the position of the necessary sealing layer and cuts off the bottom airflow. And the third-level treatment utilizes sectional perforation and squeeze cement to suppress and block the target well in the accompanying section, so that the blocking effect is enhanced.
A new treatment well is drilled in a preset range near the coordinates of the wellhead of the old difficult well, cement is extruded and injected for three times from the inner space and the outer space of a target well casing 2 which is necessary to be covered on the upper part of a fluid overflow layer, the upper part is blocked, the lower part is cut, the middle section is reinforced, a complete trap is rebuilt, and the aim of environment-friendly treatment is fundamentally realized. The treatment well can be used as a monitoring channel subsequently, and when the target well has a problem again, secondary treatment can be carried out through the treatment well again.
The target well comprises a target well borehole 1 and a target well casing 2, the target well casing 2 is arranged in the target well borehole 1, and an annular columnar space between the target well borehole 1 and the target well casing 2 is called a casing annulus 3.
The position of the first-stage treatment well colliding with the target well is shown in figure 1 and is called a first-stage treatment operation area 8; the position of the collision of the secondary treatment well and the target well is shown in figure 1 and is called a secondary treatment operation area 9; the 'region of the remedial well accompanying the target well' for tertiary remediation is the accompanying section of the remedial well accompanying the target well 'drilled down' in step S2, that is, the tertiary remedial operation region 10 is located between the first and second levels of remedial operation regions 8 and 9 as shown in fig. 1.
In the description of the present embodiment, the term 'collision' means: the remedial well borehole 7 of the remedial well is communicated with the target well borehole 1. The term 'companion' means that: the abatement well borehole 7 and the target well borehole 1 are parallel to each other, or the distance between the axis of the abatement well borehole 7 and the axis of the target well borehole 1 is within a predetermined range.
On the basis of the above scheme, in step S1, a treatment well is drilled within a preset range from a target well, and the treatment well collides with the target well at a certain distance above a necessary capping layer, specifically:
an upper borehole 701 for an abatement borehole 7 is drilled within a predetermined range of a target well, the upper borehole 701 being in contact with the target well at a distance above a necessary cap layer, and a first casing 801 is disposed within the upper borehole 701.
And a first sleeve 801 is lowered into the upper borehole 701 for well cementation, drilling and plugging after waiting for the cement, and the well is circularly washed, so that the subsequent borehole operation is facilitated.
On the basis of the above scheme, in step S2, the abatement well and the target well are drilled downward together, and the necessary capping layer collides with the target well, specifically:
a first whipstock 805 is lowered into the first casing 801, the outlet of the first whipstock 805 faces away from the target well, a milling pipe string 806 is lowered, a lower portion of the first casing 801 is cut off to form an exposed well section 808, the milling pipe string 806 is replaced by a drill string 901, the exposed well section 808 and the target well are drilled downwards along with the target well to form a lower well bore 702 of the treatment well bore 7, and the lower well bore 702 meets the target well in the necessary sealing layer.
As shown in fig. 1 to 3, the lower end of the upper borehole 701 is curved toward and collides with one side of the target borehole 1, and the lower end of the first casing 801 is also curved with the upper borehole 701, so that if the lower borehole 702 is directly drilled downward, the lower borehole 702 may be deviated due to the obstruction of the first casing 801. Thus, lowering the first whipstock 805 may serve to anchor the azimuth and provide a point of support, and the forge milling string 806 forge mills the first casing 801 under the steering and support of the first whipstock 805 for subsequent sidetracking of the drill string 901 and formation of the lower wellbore 702.
On the basis of the above scheme, in the step S2, the window is opened to the target well casing 2 in the target well, specifically:
and arranging a second casing 904 at the lower part of the treatment well, descending a second whipstock 905 into the second casing 904, enabling an outlet of the second whipstock 905 to face the target well, descending a windowing tool to window and repair the target well casing 2 in the target well.
The reaction force after the drill bit contacts the target well casing 2 may make it difficult for the drill bit to apply weight on bit. After a second casing 904 is put into the lower part (lower well bore 702) of the treatment well for well cementation and waiting for cementing, the windowing tool has enough supporting force to complete windowing and window repairing under the supporting and guiding action of a second whipstock 905.
On the basis of the above scheme, in the step S2, cement is squeezed into the casing annulus 3 inside the target well casing 2 and near the windowing point for plugging, specifically:
running a small-size tubular string 907 in the treatment well, wherein the small-size tubular string 907 enters the inside of the target well casing 2 from a window, and whether the small-size tubular string 907 can reach the bottom of the target well casing 2 is judged;
if the small-size string 907 can reach the bottom of the target well casing 2, continuously cementing from the bottom of the well to a windowing point through the small-size string 907, and squeezing cement to the casing annulus 3 near the windowing point for plugging;
if the small size string 907 fails to reach the bottom of the target well casing 2, plugging is performed by squeezing cement into the target well casing 2 and the casing annulus 3 near the windowing point through the small size string 907.
A small size string 907 is used to try to re-enter the bottom hole and cement plug the target well casing 2 and the casing annulus 3.
Wherein the small-sized string 907 refers to a hollow string having an outer diameter smaller than the inner diameter of the target well casing 2, so as to enter the target well casing 2 and re-enter the well bottom. The small size string 907 may be a well-coiled tubing or other tubular structure that may be used internally to pour and drain cement to a target location.
Preferably, a primer 908 is further fixedly disposed on a sidewall of a lower end of the small-sized string 907, the primer 908 may be a weight block made of any material, and the gravity of the primer 908 guides the lower end of the small-sized string 907 to move down along the target well casing 2. More preferably, the outer edge of the lower end of the primer 908 is chamfered so that the primer 908 can follow the target well casing 2.
On the basis of the above scheme, in step S3, the treatment well performs staged perforation on the target well casing 2, specifically:
step S31, running the directional perforation string 1001;
step S312, after a section of perforation is opened to the target well casing 2, the directional perforation string 1001 is moved up or down for a distance, and then a section of perforation is opened to the target well casing 2, and the above operations are repeated until a predetermined number of sections of perforations are opened.
And (3) perforating by using the directional perforating string 1001 to communicate the target well casing 2 with the casing annulus 3, so that cement can be extruded into the middle of the target well casing 2 conveniently.
Based on the above solution, in the step S1 and the step S2, a magnetic ranging technique is used to measure the distance between the abatement well and the target well during the drilling process of the abatement well, so as to determine the drilling direction of the abatement well.
The magnetic distance measuring technology can accurately position the distance between the treatment well and the target well, and the drilling direction is determined according to the detected distance.
On the basis of the scheme, the magnetic distance measurement and the drilling of the treatment well are alternately carried out. After the magnetic distance measurement, the drilling direction of the treatment well is adjusted according to the measured distance information, after the treatment well is drilled for a section, the direction is adjusted through the magnetic distance measurement, and the magnetic distance measurement is alternately performed to ensure the direction accuracy of the treatment well.
On the basis of the above scheme, in step S1, the preset range is a range in which magnetic ranging can be detected.
In one embodiment, as shown in fig. 1, at the surface 100, a target well wellhead 5 of a target well bore 1 is submerged in a large pit 4 due to abnormal oil and water overflow, a target well casing 2 is arranged in the target well bore 1, the area between the target well casing 2 and the target well bore 1 is called a casing annulus 3, and the casing annulus 3 may be the condition that cement is not returned or the cementing strength is poor. For the old and disadvantaged wells with the above conditions, the traditional surface treatment method can only treat the symptoms, but cannot enter the target well borehole 1 again along the target well casing 2.
In the underground three-level environment-friendly treatment method for the problematic well of the embodiment, the treatment well borehole 7 is formed by drilling in the underground area by using the drilling machine 6, and the relative position of the target well borehole 1 and the treatment well borehole 7 is measured by using a magnetic distance measuring device (not shown) during drilling so as to guide the track of the treatment well borehole 7. The drilling rig 6 is preferably a full-scale drilling rig for directional drilling operations, and the subterranean zone may be a single formation, a portion of a formation, or multiple formations. In the present embodiment, a plurality of strata are taken as an example of a subterranean zone, and as shown in fig. 1, the subterranean zone is referred to as a first stratum 101, a second stratum 102 and a third stratum 103 from top to bottom in sequence.
The method comprises the following steps:
step S1: and primary treatment, namely drilling a treatment well within a preset range from a target well, wherein the treatment well collides with the target well at a certain distance above a necessary sealing layer, and cement is squeezed from the treatment well to a sleeve annulus 3 of the target well for plugging.
The method specifically comprises the following steps: within a preset range (magnetic ranging measurable range) from a target well, a drilling machine 6 drives a drill string 901 to drill an upper well bore 701 forming a remedial well bore 7, the upper well bore 701 collides with the target well at a first formation 101 (for example, 200m away from a necessary capping layer), and the upper well bore 701 is communicated with a casing annulus 3 of the target well bore 1. As shown in fig. 2, a first casing 801 is set in the upper borehole 701 for cementing and drilling plug after waiting for cementing, a squeeze cement pipe column 802 is set after circulating flushing, and cement 803 flows from the casing annulus 3 to the weak point 804 due to the existence of pores at the weak point 804, thereby blocking the casing annulus 3. Wherein cement may flow both up and down the weakened locations 804, only the upward flow arrows are shown in fig. 2, since cement flow up the weakened locations 804 is the more favorable direction for repairing the wellbore. Preferably, the shoe of the first casing 801 is at a vertical distance of 20m (vertical distance being the length of the upper wellbore 701 in the section) from the point of impact where the upper wellbore 701 impacts the target well.
Step S2: secondary treatment, wherein the treatment well and the target well are drilled downwards along with each other, the necessary sealing layer collides with the target well, a target well casing 2 in the target well is windowed, and cement is squeezed and injected into the casing annulus 3 in the target well casing 2 and near the windowing point for plugging;
the method specifically comprises the following steps: as shown in fig. 3, a first whipstock 805 is lowered into the first casing 801, the outlet of the first whipstock 805 faces away from the target well, a milling pipe string 806 is lowered, and after lowering the first casing into the upper well bore 701, a milling cutter 807 below the milling pipe string 806 is activated, and the rotating milling cutter 807 at high speed cuts off the lower portion of the first casing 801 to form an exposed well section 808 for sidetracking.
As shown in fig. 4, the forge milling string 806 is replaced with a drill string 901, and after sidetracking from the exposed well section 808, the lower wellbore 702 of the remedial well bore 7 is formed with the target well downhole (e.g., 200m downhole), preferably with a downhole distance of 0.5m to 1 m. Wherein, the lower side of the drill string 901 is connected with the screw 902 and the drill bit 903 in sequence, and the directional drilling penetrates through the second stratum 102 to the third stratum 103 (necessary capping layer) to collide with the target well again. The drill bit 903 may drill through the casing annulus 3, but the reaction force upon contact with the target well casing 2 may make it difficult to apply weight-on-bit to the screw 902 and the drill bit 903, at most, allowing the target well casing 2 to be compressed to form the pit 201.
Therefore, as shown in fig. 5, after the trip, a second casing 904 is run in the lower borehole 702, after cementing and waiting for cementing of the borehole plug, a second whipstock 905 is run in the second casing 904, and the outlet of the second whipstock 905 is oriented toward the target well according to the magnetic ranging result.
A windowing tool is run in, which is a drill string 901, a screw 902 and a milling cone 906 in sequence from top to bottom. Because the milling teeth are fully distributed on the circumferential side surface of the milling cone 906 and have a certain taper, after the small hole is formed on the target well casing 2, the head of the milling cone 906 is guided into the target well casing 2 to complete windowing. The threaded rod 902 pendulum tool face engages the second whipstock 905 such that the milling cone 906 is always oriented towards the axis of the target well casing 2. More specifically, the milling cone 906 should use a compound milling cone during windowing, and a single milling cone is used to trim the window after windowing.
The first whipstock 805 and the second whipstock 905 may be different whipstocks or may be the same whipstock, and different names are used in this embodiment to distinguish different operation steps.
After finishing repairing the window and pulling out the drill, trying to re-enter the well bottom, and the specific process is as follows: as shown in FIG. 6, a small size tubular string 907, such as coiled tubing having good flexibility, is run in lower wellbore 702. The bottom of the small-sized string 907 is connected with a primer 908, and the small-sized string 907 is guided into the interior of the target well casing 2 along the window. If the small-size tubular column 907 can reach the bottom of the target well casing 2, after the well is directly washed circularly through the small-size tubular column 907, the small-size tubular column 907 is lifted from the bottom of the well and continuously injected with cement to a windowing point, and the inner part of the target well casing 2 and the casing annulus 3 are blocked; if the small-size pipe column 907 can not enter the bottom of the target well again, the inner part of the target well casing 2 and the casing annulus 3 are plugged by cement squeezing near the windowing point after the target well is directly washed by the small-size pipe column 907 in a circulating way.
Step S3: and a third-level treatment 10, wherein in the area where the treatment well accompanies the target well, the treatment well conducts subsection perforation to the target well casing 2, and cement is squeezed at the perforation to seal the inside of the target well casing 2 and the casing annulus 3.
The method specifically comprises the following steps: as shown in fig. 7, a directional perforating string 1001 is lowered in a close-running section of the second formation 102 in the lower wellbore 702, the directional perforating string 1001 carries a perforating gun and a directional gyro (not shown in the drawings), the directional gyro adjusts the perforating charges 1002 in the perforating gun towards the target well wellbore 1, and the fired perforating charges 1002 form tunnels 1003 communicating the inner and outer casing annuli 3 of the target well casing 2.
After completing a section of perforation, the directional perforating string 1001 is pulled and the above operations are continued to communicate the inner and outer casing annuli 3 of the associated section of the target well casing 2. Then, the same level of treatment and the same level of treatment are carried out, cement is squeezed and injected into the lower well bore 702, and the inner casing annulus 3 and the outer casing annulus 3 of the target well casing 2 are blocked in a pressure-holding mode.
After the third-stage treatment is finished, the artificial trap of about 200m is formed on the upper part of the necessary sealing layer of the target well borehole 1, so that the fluid can be effectively prevented from overflowing and the treatment is more thorough. And finally, the treatment well hole 7 is reserved as a monitoring channel, and when the target well hole 1 has a problem again, secondary treatment can be carried out through the treatment well hole 7 again.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A underground three-level environment-friendly treatment method for a difficult and complicated well is characterized by comprising the following steps:
step S1: primary treatment, namely drilling a treatment well within a preset range from a target well, wherein the treatment well is arranged above a necessary sealing layer and collides with the target well, and cement is squeezed from the treatment well to a sleeve annulus (3) of the target well for plugging;
step S2: secondary treatment, wherein the treatment well and the target well are drilled downwards along with each other, the necessary sealing layer collides with the target well, a target well casing (2) in the target well is windowed, and cement is squeezed into the casing annulus (3) in the target well casing (2) and near the windowing point for plugging;
step S3: and (3) performing tertiary treatment, wherein in an area where the treatment well is accompanied with the target well, the treatment well performs subsection perforation on the target well casing (2), and cement is squeezed at the perforation to seal the inner part of the target well casing (2) and the casing annulus (3).
2. The underground three-level environmental protection abatement method of claim 1, wherein in step S1, an abatement well is drilled within a preset range from a target well, and the abatement well collides with the target well above a necessary capping layer, specifically:
drilling an upper borehole (701) of an remedial borehole (7) within a predetermined range of a target well, the upper borehole (701) colliding with the target well above a necessary cap layer, and disposing a first casing (801) within the upper borehole (701).
3. The underground three-level environmental protection abatement method of claim 2, wherein in step S2, the abatement well is drilled downwards along with the target well, and the required capping layer collides with the target well, specifically:
and (2) a first whipstock (805) is put into the first casing (801), the outlet of the first whipstock (805) faces away from the target well, a forge and mill string (806) is put into the first casing (801), a part of the lower side of the first casing (801) is cut off to form an exposed well section (808), the forge and mill string (806) is replaced by a drill string (901), the exposed well section (808) is drilled downwards along with the target well to form a lower well bore (702) of the treatment well bore (7), and the necessary sealing layer of the lower well bore (702) is collided with the target well.
4. The underground three-level environmental protection governance method for the problematic well according to claim 1, wherein in the step S2, the target well casing (2) in the target well is windowed, specifically:
the lower part of administering the well sets up second sleeve pipe (904) second whipstock (905) is gone into in second sleeve pipe (904), the export orientation of second whipstock (905) the window instrument gives of going into down target well sleeve pipe (2) in the target well is windowed and is repaiied the window.
5. The underground three-level environmental protection governance method for the suspect well according to claim 1, wherein in the step S2, the casing annulus (3) inside the casing (2) of the target well and near the windowing point is squeezed with cement for plugging, specifically:
running a small-size string (907) in the treatment well, wherein the small-size string (907) enters the inside of the target well casing (2) from a window, and whether the small-size string (907) reaches the bottom of the target well casing (2) is judged;
if the small-size string (907) reaches the bottom of the target well casing (2), continuously cementing from the bottom of the well to a windowing point through the small-size string (907), and squeezing cement to the casing annulus (3) near the windowing point for plugging;
if the small-size string (907) does not reach the bottom of the target well casing (2), then the target well casing (2) and the casing annulus (3) are squeezed to be sealed by the small-size string (907) near a window point.
6. The underground three-level environmental protection abatement method of claim 1, wherein in step S3, the abatement well is perforated to the target well casing (2) in sections, specifically:
step S31, a directional perforating string (1001) is put in;
and step S32, after a section of perforation is opened to the target well casing (2), the directional perforation pipe column (1001) is moved upwards or downwards, a section of perforation is opened to the target well casing (2), and the operations are repeated until a preset section of perforation is opened.
7. The three-stage environmental protection improvement method for the underground of the problematic well according to any one of claims 1 to 6, wherein in the steps S1 and S2, the distance between the improvement well and the target well is measured by using a magnetic distance measurement technique during the drilling process of the improvement well, so as to determine the drilling direction of the improvement well.
8. The underground three-stage environmental protection treatment method for the suspect well according to claim 7, wherein said magnetic distance measurement and said drilling of said treatment well are performed alternately.
9. The method according to claim 7, wherein in step S1, the predetermined range is a range in which magnetic ranging is detectable.
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Cited By (1)
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| CN116677336A (en) * | 2023-02-28 | 2023-09-01 | 中国石油天然气集团有限公司 | Method for treating casing fracture |
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| CN114961632B (en) | 2023-01-24 |
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