CN114635667B - Method for plugging brine production well group Zhou Liexi - Google Patents
Method for plugging brine production well group Zhou Liexi Download PDFInfo
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- CN114635667B CN114635667B CN202210328865.5A CN202210328865A CN114635667B CN 114635667 B CN114635667 B CN 114635667B CN 202210328865 A CN202210328865 A CN 202210328865A CN 114635667 B CN114635667 B CN 114635667B
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- well
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- brine
- plugging
- zhou
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- 239000012267 brine Substances 0.000 title claims abstract description 52
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 55
- 238000007599 discharging Methods 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 32
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 235000002639 sodium chloride Nutrition 0.000 description 12
- 238000005553 drilling Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
Abstract
The invention relates to the technical field of plugging of annular cracks of wells Zhou Shuini, and discloses a method for plugging a brine production well group well Zhou Liexi, which comprises the following steps: logging, namely selecting a perforating horizon to carry out perforation; the packer is inserted below the perforation layer, the drill rod is inserted above the perforation layer, and the wellhead is sealed and provided with a slurry discharging device and a pressure gauge; injecting cement slurry into the slurry discharging device for stirring; pumping brine in the well, stopping pumping brine when the pressure gauge shows negative pressure P, discharging well-stirred cement paste in the paste discharging device, and passively sucking the cement paste into cracks around the well for plugging; and slowly lifting the drill rod out of the cement paste surface, increasing the pressure by the booster pump until the pressure reduction is less than 0.5MPa within 30 minutes, stopping boosting, and waiting for solidification of the cement paste. The invention has simple structure, low construction cost, capacity of realizing the blocking of the whole well section and good cementing quality.
Description
Technical Field
The invention relates to the technical field of plugging of annular gaps of wells Zhou Shuini, in particular to a method for plugging a brine production well group well Zhou Liexi.
Background
A typical brine production well is a well cementing of a technical casing above a top plate of a salt bed, then drilling the top plate, and the wellbore is run through another well in the salt bed. The mining mode is that fresh water is injected into one well to erode rock salt, and brine is discharged from the other well, at the later period of mining, due to the water-soluble characteristic that rock salt is easy to dissolve, a rock salt roof is exposed until the roof and a cover layer collapse, so that casing shoes are exposed, and in addition, poor cementing quality and vibration effect in the production process are achieved, cementing quality of a cement ring around the brine mining well is poor, cracks develop and are communicated, brine and corrosive associated gas are extremely easy to invade and corrode the cement ring under the condition of lacking of the roof and the cover layer of the salt layer, a well Zhou Liexi channel is further expanded, even shallow groundwater and air are polluted, and serious damage is caused to ecological environment. In addition, the presence of the well Zhou Liexi breaks the tightness of the brine-producing salt chamber, which is not beneficial to the application of geological storage of the salt chamber.
The plugging outside the casing is an industrial technical difficulty, and the traditional method can only plug part of the interval and cannot realize large-area plugging of the well Zhou Liexi, especially the lower well Zhou Liexi eroded by brine. Because of the collapse of the salt layer cover layer and the erosion of brine, the lower well Zhou Liexi is relatively large in space, brine is filled in between, the traditional plugging technology cannot replace brine in the irregular well Zhou Liexi and then seal the fracture channel, and if only part of the layer section is plugged, the plugging capability of brine and corrosive associated gas can be quickly damaged. Therefore, the industry needs a plugging method capable of sealing most of the well Zhou Liexi outside the casing at one time, and the sealing effect is durable, so that the requirements of pollution control of the brine production well and geological storage of the salt cavity can be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for plugging a brine production well group Zhou Liexi.
The aim of the invention is realized by the following technical scheme: a method for plugging a brine production well group Zhou Liexi, the method comprising the steps of:
s1: logging well, obtaining crack distribution data around a shaft and brine liquid level positions, then selecting perforation layers to perform perforation, wherein the perforation layers select an interval between an upper part of a covering layer collapse influence area of a salt layer and a lower part of a bottom boundary of a boiled water mud ring, and are layers which are large in well Zhou Liexi and good in connectivity, and perforation holes are uniformly distributed on the wall of a casing pipe.
S2: the packer is inserted below the perforation level, the drill rod is inserted above the perforation level, the wellhead and the ground leakage channels possibly existing around the wellhead are closed, the sealing performance of a well group system when pumping brine is guaranteed, and the slurry discharging device and the pressure gauge are arranged.
S3: and (2) according to the data obtained after logging in the step S1, the volume of the well Zhou Liexi is calculated, meanwhile, the cement slurry amount is configured in consideration of the residual quantity in the well, and cement slurry is injected into the slurry discharging device for stirring.
S4: the brine in the other well in the well group is pumped, the brine liquid level in the well group is reduced to form negative pressure under the sealing state due to the principle of a communicating vessel, when the pressure gauge displays negative pressure P, the pumping of the brine in the other well is stopped, well stirred cement slurry in the slurry discharging device is discharged, the cement slurry is passively sucked into cracks around the well to be plugged due to the fact that the well is in the negative pressure state, the pressure P displayed by the pressure gauge is calculated by adopting a water column pressure formula, P=ρgh, ρ is the brine density, g is the gravity acceleration, and h is the vertical height from the bottom boundary of the two boiled water mud rings to the brine liquid level.
S5: the drilling rod is slowly lifted out of the cement paste surface, so that the cement paste can not submerge the drilling rod, the pressure in the well is increased by extruding the displacement liquid into the well under high pressure, when the pressure of the pressure gauge exceeds the pumping pressure by 1MPa, the pumping pressure is calculated according to the well depth and the stratum pressure, the extrusion displacement liquid is stopped to keep the pressure, when the pressure of the pressure gauge is reduced by 0.5MPa, the pressure of the displacement liquid is extruded again to be increased to exceed the pumping pressure by 1MPa, the reciprocating operation is performed until the pressure reduction is less than 0.5MPa within 30 minutes, and the cement paste is stopped and is waited for solidification.
The slurry discharging device comprises a slurry discharging tank, wherein a stirrer is arranged in the slurry discharging tank, the slurry discharging tank is connected with a slurry injecting pipe and a slurry discharging pipe respectively, and the slurry injecting pipe and the slurry discharging pipe are connected with a main pipe respectively.
Preferably, the grouting pipe is provided with a second valve, the grouting pipe is provided with a third valve, and the main pipe is provided with a first valve.
According to the invention, the flow channels inside and outside the casing are opened through perforation, the full plugging of the well Zhou Liexi is realized under the continuous action of negative pressure suction and positive pressure squeezing by utilizing the communicating vessel principle of the brine production well group, and compared with a common displacement method, the displacement front edge fingering phenomenon is not easy to occur, the brine occupation is avoided, and the cementing quality is good.
Drawings
FIG. 1 is a schematic illustration of the structure of a well of the present invention;
FIG. 2 is a schematic structural view of the slurry discharging device of the present invention;
in the figure: 1-first valve, 2-second valve, 3-third valve, 4-main pipe, 5-grouting pipe, 6-grouting pipe, 7-grouting tank, 8-stirrer, 9-drill pipe, 10-pressure gauge, 11-packer, 12-sleeve, 13-perforation layer, 14-one-boiled water mud ring, 15-two-boiled water mud ring and 16-salt layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further described with reference to the drawings and specific examples.
As shown in fig. 1-2, a method for plugging a brine production well group well Zhou Liexi comprises the following steps:
s1: logging well, acquiring fracture distribution data around a well shaft and brine liquid level positions, then selecting a perforation horizon 13 for perforation, wherein the perforation horizon 13 selects an interval between an upper part of a covering layer collapse influence area of a salt layer 16 and a lower part of a bottom boundary of a boiled water mud ring 14, is a horizon which is large in well Zhou Liexi and good in connectivity, and perforation holes are uniformly distributed on the wall of a casing 12.
S2: the packer 11 is inserted below the perforation level 13, the drill rod 9 is inserted above the perforation level 13, a wellhead is closed, a ground leakage channel possibly existing around the wellhead is plugged, the sealing performance of a well group system when pumping brine is guaranteed, and a slurry discharging device and a pressure gauge 10 are arranged.
S3: and (3) calculating the volume of the well Zhou Liexi according to the data obtained after the well logging in the step S1, reserving 100 meters of allowance in the well, preparing the cement slurry amount, and injecting the cement slurry into the slurry discharging device for stirring. The first valve 1 and the third valve 3 are closed, the second valve 2 is opened, the configured cement slurry is injected into the slurry discharge tank 7 through the slurry injection pipe 5, the second valve 2 is closed after the slurry injection is completed, and the stirrer 8 is opened to start stirring the injected cement slurry.
S4: the brine in the other well in the well group is pumped, the brine liquid level in the well group is reduced to form negative pressure under the sealing state due to the principle of a communicating vessel, when the pressure gauge 10 displays negative pressure P, the brine in the other well is stopped being pumped, the third valve 3 is opened, well-stirred cement slurry in the slurry discharging device is discharged through the slurry discharging pipe 6, the cement slurry is passively sucked into cracks around the well for plugging due to the fact that the well is in the negative pressure state, the pressure P displayed by the pressure gauge 10 is calculated by adopting a water column pressure formula, P=ρgh, ρ is brine density, g is gravity acceleration, and h is the vertical height from the bottom boundary of the two-water mud ring to the brine liquid level.
S5: the drilling rod 9 is slowly lifted out of the cement paste surface, so that cement paste cannot submerge the drilling rod 9, the third valve 3 is closed, the first valve 1 is opened, the pressure in the well is increased by extruding displacement fluid (water or drilling fluid) into the well at high pressure, when the pressure of the pressure gauge 10 exceeds 11MPa, the extrusion displacement fluid is stopped to keep the pressure, when the pressure of the pressure gauge 10 is 10.5MPa, the extrusion displacement fluid is pressurized to exceed 11MPa again, the reciprocating operation is performed until the pressure of the pressure gauge 10 is greater than 10.5MPa within 30 minutes, and cement paste solidification is waited.
The slurry discharging device comprises a slurry discharging tank 7, a stirrer 8 is arranged in the slurry discharging tank 7, the slurry discharging tank 7 is respectively connected with a slurry injecting pipe 5 and a slurry discharging pipe 6, and the slurry injecting pipe 5 and the slurry discharging pipe 6 are respectively connected with the main pipe 4.
The grouting pipe 5 is provided with a second valve 2, the grouting pipe 6 is provided with a third valve 3, and the main pipe 4 is provided with a first valve 1.
The principle of the communicating vessel is that a plurality of vessels with bottoms communicated with each other are the same liquid, and the liquid level of the vessels is always kept on the same horizontal plane when the liquid does not flow. By utilizing the principle of a communicating vessel, the brine level in another well Zhou Liexi in the well group can be reduced by pumping brine from the other well, negative pressure is formed, pressure change can be rapidly reflected on the pressure gauge 10 due to existence of perforation holes, the third valve 3 is opened, cement slurry in the slurry discharging tank 7 is filled into a well Zhou Liexi with a certain depth downwards under the action of the negative pressure suction force through the perforation holes, pressure balance is restored, the third valve 3 is closed, the first valve 1 is opened, displacement liquid enters the well through high-pressure extrusion, and the displacement liquid pushes cement slurry remained in the well to fill the well Zhou Liexi above the perforation layer 13. Under the continuous action of positive and negative pressure, the well Zhou Liexi without brine filling can be completely plugged.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. A method for plugging a brine production well group Zhou Liexi is characterized by comprising the following steps: the method comprises the following steps:
s1: logging a well, acquiring fracture distribution data and brine liquid level positions around a well shaft, then selecting a perforation horizon (13) for perforation, wherein the perforation horizon (13) selects an interval between the upper part of a covering layer collapse influence area of a salt layer (16) and the lower part of the bottom boundary of a water cement ring (14), is a horizon which is large in well Zhou Liexi and good in connectivity, and perforation holes are uniformly distributed on the wall of a casing (12);
s2: the packer (11) is inserted below the perforation horizon (13), the drill rod (9) is inserted above the perforation horizon (13), and the wellhead is sealed and provided with a slurry discharging device and a pressure gauge (10);
s3: injecting cement slurry into the slurry discharging device for stirring;
s4: pumping brine in another well in the well group, wherein the liquid level of the brine in the well group is lowered to form negative pressure under the sealing state due to the principle of a communicating vessel, pumping the brine in the other well is stopped when a pressure gauge (10) displays negative pressure P, well stirred cement paste in a slurry discharging device is discharged, and the cement paste is passively sucked into cracks around the well for plugging due to the fact that the well is in the negative pressure state;
s5: slowly lifting the cement paste surface out of the drill rod (9), increasing the pressure in the well by extruding displacement liquid into the well at high pressure, stopping extruding the displacement liquid to keep the pressure when the pressure of the pressure gauge (10) exceeds the pumping pressure by 1MPa, pressurizing the displacement liquid to exceed the pumping pressure by 1MPa when the pressure of the pressure gauge (10) is reduced by 0.5MPa, and reciprocating in this way until the pressure reduction is less than 0.5MPa within 30 minutes, and waiting for solidification of the cement paste.
2. The method for plugging a brine production well group Zhou Liexi according to claim 1, wherein the method comprises the following steps: in the step S2, wellhead sealing treatment comprises closing the wellhead and plugging a ground leakage channel possibly existing around the wellhead, so that the sealing performance of a well group system during pumping brine is ensured.
3. The method for plugging a brine production well group Zhou Liexi according to claim 1, wherein the method comprises the following steps: in the step S3, the volume of the well Zhou Liexi is calculated according to the data obtained after the well logging in the step S1, and the amount of cement paste is configured in consideration of the residual amount in the well.
4. A method for plugging a brine production well group Zhou Liexi as defined in claim 3, wherein: the slurry discharging device comprises a slurry discharging tank (7), wherein a stirrer (8) is arranged in the slurry discharging tank (7), the slurry discharging tank (7) is respectively connected with a slurry injecting pipe (5) and a slurry discharging pipe (6), and the slurry injecting pipe (5) and the slurry discharging pipe (6) are respectively connected with a main pipe (4).
5. The method for plugging a brine production well group Zhou Liexi according to claim 4, wherein the method comprises the following steps: the grouting pipe (5) is provided with a second valve (2), the grouting pipe (6) is provided with a third valve (3), and the main pipe (4) is provided with a first valve (1).
6. The method for plugging a brine production well group Zhou Liexi according to claim 1, wherein the method comprises the following steps: in the step S4, the pressure P displayed by the pressure gauge (10) is calculated by adopting a water column pressure formula, p=pgh, ρ is the brine density, g is the gravity acceleration, and h is the vertical height from the bottom boundary of the two-stage water mud ring (15) to the brine liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210328865.5A CN114635667B (en) | 2022-03-31 | 2022-03-31 | Method for plugging brine production well group Zhou Liexi |
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| CN202210328865.5A CN114635667B (en) | 2022-03-31 | 2022-03-31 | Method for plugging brine production well group Zhou Liexi |
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| CN114635667A CN114635667A (en) | 2022-06-17 |
| CN114635667B true CN114635667B (en) | 2024-04-12 |
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