CN110671069A - Method for suspending and erecting sand bridge in oil-water well casing and leakage repairing method - Google Patents
Method for suspending and erecting sand bridge in oil-water well casing and leakage repairing method Download PDFInfo
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- CN110671069A CN110671069A CN201810722596.4A CN201810722596A CN110671069A CN 110671069 A CN110671069 A CN 110671069A CN 201810722596 A CN201810722596 A CN 201810722596A CN 110671069 A CN110671069 A CN 110671069A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B29/10—Reconditioning of well casings, e.g. straightening
Abstract
The invention discloses a sand bridge erecting method and a leakage repairing method for suspension in an oil-water well casing, wherein the sand bridge erecting method comprises the following steps: replacing mud into the sleeve; a step of displacing a low-density material into the casing, wherein the low-density material is located above the slurry; and replacing the quartz sand into the sleeve, wherein the quartz sand is positioned above the low-density material. The invention forms the sand bridge with bearing capacity at any position in the sleeve, does not need waiting for setting, reduces the construction strength, has convenient post-treatment and low price, replaces the conventional cement plug supporting process, and realizes the suspended bridge construction process with low cost, easy treatment and easy construction. The problem that the construction cost of the existing suspension plug is high is solved, and the purposes of reducing the cost and shortening the construction period are achieved.
Description
Technical Field
The invention relates to a technology for repairing a damaged casing well, in particular to a method for suspending and erecting a sand bridge in an oil-water well casing and a leakage repairing method.
Background
With the continuous development of the petroleum industry, old oil fields such as victory, Daqing, Dagang, North China, Liaohe, Jilin, Jiangsu and the like in the east of China are developed successively for more than 50 years, and under the influence of factors such as development history, ground stress, corrosion, underground operation and the like, various forms of losses of underground casings occur, particularly in blocks in the later period of high-water-content development, the corrosion, deformation and damage of oil-water well pipe columns are serious, and the requirement of normal production of the oil fields is influenced. Taking a certain oil field in the east of China as an example, only in the period of 'eleven five', the casing damage proportion of an oil-water well with the well age of more than 20 years is up to more than 60%; the water drive control reserve is reduced from 82.8 percent to 80.2 percent, which causes severe influence on production and operation. For this reason, the damaged well of the casing needs to be repaired to restore the recoverable reserves of the oil field.
The method comprises the steps of filling cement slurry between a casing and a patching pipe after the casing of the oil-water well is damaged, sealing the broken part of the casing by adopting casing patching, preventing casing leakage, repairing the broken part of the casing by putting the patching pipe below the broken part of the casing, filling the cement slurry between the casing and the patching pipe, solidifying the cement slurry, and integrating the casing and the patching pipe into a whole, so that the broken part of the casing can be repaired well, and the oil-water well can be produced normally.
And keywords such as casing pipes, sand bridges and the like are searched, and similar published technologies are not found.
Disclosure of Invention
The invention aims to provide a method for hanging and erecting a sand bridge in an oil-water well casing and a leakage repairing method, wherein the sand bridge with pressure bearing capacity is formed at any position in the casing, no need of waiting and setting is needed, the construction strength is reduced, meanwhile, the post-treatment is convenient, the price is low, the technology replaces the conventional cement plug supporting process, and the hanging and erecting process with low cost, easy treatment and easy construction is realized. The problem that the construction cost of the existing suspension plug is high is solved, and the purposes of reducing the cost and shortening the construction period are achieved.
In order to achieve the purpose, the invention adopts the following technical scheme that the method for suspending and erecting the sand bridge in the oil-water well casing comprises the following steps:
replacing mud into the sleeve;
a step of displacing a low-density material into the casing, wherein the low-density material is located above the slurry;
and replacing the quartz sand into the sleeve, wherein the quartz sand is positioned above the low-density material.
The density of the slurry is 1.5g/cm3。
The density of the low-density material is 1.01-1.1g/cm3In the meantime.
The low density material is ground walnut shells.
The density of the quartz sand is 1.65g/cm3。
In order to achieve the purpose, the invention adopts the following technical scheme that the method for mending the leakage of the sand bridge of the suspended frame in the oil-water well casing comprises the following steps:
lowering the lower port of the construction pipe column to a position 400m below the leakage point of the casing, replacing the five-square mud with the density of 1.5g/cm3, lifting the construction pipe column to a position 80m below the leakage point, and replacing the redundant mud with clean water;
lifting the construction pipe column to a position 70m above the leak point, filling 200Kg of low-density material into a wellhead, and stacking by settling to form a support bridge with the height of 20 m;
after settling for 2 hours, continuously filling 1.65g/cm3 quartz sand into the wellhead, wherein the thickness of the quartz sand is 30m, the internal friction between the grits and the casing wall are increased along with the accumulation of the grits, and a sand bridge with pressure bearing capacity is formed;
and (3) putting the patching pipe down, putting the patching pipe down to the upper surface of the sand bridge, namely a sand surface, pressing the load on the sand surface completely to carry out casing patching construction, wherein the sand surface can bear the weight of the patching pipe without moving down, and can bear the construction pressure of 15MPa at the same time, thereby meeting the requirements of site construction.
After the leakage repairing construction is finished, the sand bridge can be cleaned only by sand washing, a cased well bore channel is recovered, and subsequent production operation is carried out.
Compared with the prior art, the invention has the following beneficial effects:
through adopting density 1.5 mud, low-priced low density material and quartz sand cooperation to use, utilize the internal friction between the granule and the frictional force between granule and the casing wall, constantly pile up through the granule, frictional force crescent forms the sand bridge that can satisfy the construction demand in the cover intraductal. Firstly, 5-square slurry with the density of 1.5 is replaced into a shaft, then a well head is filled with cheap low-density materials 0.2t (the density is between 1.01 and 1.1. such as crushed walnut shells), the low-density materials sink in water and float on the surface of the slurry layer, and a support bridge is formed preliminarily by stacking; and filling quartz sand, wherein the quartz sand is continuously accumulated and settled on the layer surface formed by the low-density material to form a sand bridge with supporting and pressure-bearing capabilities. The formed sand bridge has good bearing capacity, the sticking and blocking pipe column can completely press the load on a sand surface, and the construction pressure of 15MPa can be met and the sand bridge is stable. Therefore, the invention can achieve the aim of the invention, does not need waiting for coagulation and shortens the construction period; after construction, the drill plug is not needed, and sand washing is carried out, so that the construction strength is reduced; the construction is simple and easy, and low cost has practiced thrift the operating cost, increases the economic benefits of oil-water well.
Drawings
FIG. 1 is a diagram of the slurry state into which the present invention is substituted.
FIG. 2 is a diagram illustrating a state of filling a low-density material according to the present invention.
FIG. 3 is a diagram showing the state of filling the quartz sand according to the present invention.
FIG. 4 is a state diagram of the lower caulk tube after the sand bridge of the present invention is formed.
In the figure: the device comprises a sleeve 1, slurry 2, a low-density material 3, quartz sand 4 and a patch pipe 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: a method for suspending and erecting a sand bridge in an oil-water well casing comprises the following steps:
replacing mud into the sleeve;
a step of displacing a low-density material into the casing, wherein the low-density material is located above the slurry; the low density material may be ground walnut shells.
And replacing the quartz sand into the sleeve, wherein the quartz sand is positioned above the low-density material.
The density of the slurry is 1.5g/cm3The density of the low-density material is 1.01-1.1g/cm3The density of the quartz sand is 1.65g/cm3；
By applying the method, various operations in the casing can be finished, such as casing leakage repairing operations and the like.
Referring to fig. 1 to 4, a method for repairing a leakage of an oil-water well casing using an internal suspended sand bridge comprises:
the construction process of the invention is as follows:
①, lowering the lower end opening of the construction pipe column to 400m below the leakage point of the casing pipe, and replacing the lower end opening with a five-square density of 1.5g/cm3And (2) the slurry 2 (five-side slurry can fill the inner cavity of the casing pipe with the length of about 400m, the upper plane of the slurry is generally ensured to be positioned 80m below the leak point according to the damage position of the leak point, if the slurry is surplus, the redundant slurry is washed out by clean water, the well is lifted to 80m below the leak point, and the redundant slurry is replaced by clean water. As shown in fig. 1. The replacing technology of the construction pipe column belongs to the conventional technology in the field, and the conventional prior art is adopted no matter various media are pumped or replaced into the underground through the pipe column.
400m below the leak point is not a well bottom, nor a casing pipe plug, and is well liquid (water). Because the liquid is incompressible, after the well fluid at the designed position in the casing is replaced by the mud, the mud state is changed from flowing to static. The mud is a semi-colloidal suspension mainly composed of clay particles dispersed in water, when the mud is static, the inside of the mud is settled, the clay particles are aggregated to form a network structure which is thickened, the fluidity is deteriorated, and the mud cannot fall down. After the construction is finished, the net structure is damaged by scouring and shearing force, and the fluidity is restored.
②, lifting the construction pipe column to 70m above the leakage point, filling 200Kg of low-density material 3 (density is 1.01-1.1. such as crushed walnut shell) into the well mouth, and depositing to form a support bridge of about 20m by settling and stacking, as shown in fig. 2.
③, after settling for 2 hours, the well mouth is filled with quartz sand 4 with the density of 1.65g/cm3(ii) a The thickness of the silica sand is generally 30m, and the internal friction between the grits and the casing wall increase as the grits are piled up, forming a sand bridge having a pressure-bearing capacity, as shown in fig. 3.
④, placing a patch pipe 5, placing the patch pipe 5 to a sand surface 4, pressing the load on the sand surface 4 completely to carry out casing patch construction, wherein the sand surface 4 can bear the weight of the patch pipe without moving down, and can bear the construction pressure of 15MPa to meet the requirements of site construction, as shown in FIG. 4, the patch construction of the patch pipe and the casing belongs to the conventional technology in the field, for example, after the patch pipe blocks a casing leakage point, two ports of the patch pipe and the casing are welded and sealed, and the like.
After the construction is finished, the sand bridge can be cleaned only by sand washing, a cased well bore channel is recovered, and subsequent production operation is carried out.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for suspending and erecting a sand bridge in an oil-water well casing comprises the following steps:
replacing mud into the sleeve;
a step of displacing a low-density material into the casing, wherein the low-density material is located above the slurry;
and replacing the quartz sand into the sleeve, wherein the quartz sand is positioned above the low-density material.
2. The method for suspending and erecting sand bridges in oil-water well casing according to claim 1, wherein the density of the slurry is 1.5g/cm3。
3. The method for suspending and erecting sand bridge in oil-water well casing according to claim 1 or 2, wherein the density of the low-density material is 1.01-1.1g/cm3In the meantime.
4. The method of claim 3, wherein the low density material is ground walnut shells.
5. The method for suspending and erecting sand bridges in oil-water well casing pipe according to claim 3, wherein the density of the quartz sand is 1.65g/cm3。
6. A method for mending leakage of an internal suspended sand bridge in oil-water well casing application comprises the following steps:
the lower port of the construction pipe column is lowered to a position 400m below the leakage point of the casing pipe, and the density of the five square is replaced by 1.5g/cm3Lifting the construction pipe column to a position 80m below the leakage point, and replacing redundant slurry with clean water;
lifting the construction pipe column to a position 70m above the leak point, filling 200Kg of low-density material into a wellhead, and stacking by settling to form a support bridge with the height of 20 m;
after settling for 2 hours, the well head is continuously filled with 1.65g/cm3The thickness of the quartz sand is 30m, the internal friction between the grits and the casing wall are increased along with the accumulation of the grits, and a sand bridge with pressure bearing capacity is formed;
and (3) putting the patching pipe down, putting the patching pipe down to the upper surface of the sand bridge, namely a sand surface, pressing the load on the sand surface completely to carry out casing patching construction, wherein the sand surface can bear the weight of the patching pipe without moving down, and can bear the construction pressure of 15MPa at the same time, thereby meeting the requirements of site construction.
7. The method for repairing the leakage of the suspended sand bridge in the casing of the oil-water well as claimed in claim 6, wherein after the leakage repairing construction is finished, the sand bridge can be cleaned only by sand washing operation, and the casing well bore passage is recovered for subsequent production operation.
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| CN201810722596.4A CN110671069A (en) | 2018-07-03 | 2018-07-03 | Method for suspending and erecting sand bridge in oil-water well casing and leakage repairing method |
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| CN201810722596.4A CN110671069A (en) | 2018-07-03 | 2018-07-03 | Method for suspending and erecting sand bridge in oil-water well casing and leakage repairing method |
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