CA2783392A1 - Oil-gas well structure for facilitating extracting a downhole filter string and method for extracting the string - Google Patents
Oil-gas well structure for facilitating extracting a downhole filter string and method for extracting the string Download PDFInfo
- Publication number
- CA2783392A1 CA2783392A1 CA2783392A CA2783392A CA2783392A1 CA 2783392 A1 CA2783392 A1 CA 2783392A1 CA 2783392 A CA2783392 A CA 2783392A CA 2783392 A CA2783392 A CA 2783392A CA 2783392 A1 CA2783392 A1 CA 2783392A1
- Authority
- CA
- Canada
- Prior art keywords
- filter string
- downhole filter
- ultra light
- light particles
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
- E21B49/04—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil using explosives in boreholes; using projectiles penetrating the wall
Abstract
An oil-gas well structure for facilitating extracting a downhole filter string and a method for extracting the downhole filter string from the oil-gas well are provided. The oil-gas well structure includes a borehole wall (1) of the oil-gas well and a downhole filter string (2) lowered into the oil-gas well. The end of the downhole filter string (2) close to the wellhead is fixedly connected with the borehole wall (1). An annulus is formed between the downhole filter string (2) and the borehole wall (1), and the annulus is filled with ultra light particles, wherein, the density of ultra light particles approaches to or is equal to the density of the carrier fluid which carries the ultra light particles. The method for extracting the downhole filter string includes the following steps: 1) establishing channels; 2) injecting the carrier fluid for ultra light particles so as to remove the ultra light particles from the annulus completely; 3) extracting the downhole filter string. The structure can conveniently extract the downhole filter string from the oil-gas well, thus facilitating the replacement and maintenance of the downhole filter string and the parameter regulation of the flow-control filter.
Description
OIL-GAS WELL STRUCTURE FOR FACILITATING EXTRACTING A
DOWNHOLE FILTER STRING AND METHOD FOR EXTRACTING THE
STRING
Technical Field The present invention relates to the oil exploitation field, and specifically relates to an oil-gas well structure for facilitating extracting a downhole filter string and a method for extracting the downhole filter string from the oil-gas well. The oil-gas well here refers to a production well in a broader sense in oil-gas field development, which includes an oil well, a gas well, a natural gas well, an injection well, etc.
Background Art The completion structure of most mechanically sand control oil-gas wells comprises an oil-gas well and a downhole filter string run into the oil-gas well, and the oil-gas well includes a vertical well, a deviated well, a highly-deviated well and a horizontal well. As shown in Figure 1, the reference sign 1 in Figure 1 indicates a borehole wall of an oil-gas well, the reference sign 2 indicates a downhole filter string, the reference sign 3 indicates an annulus between the downhole filter string and the borehole wall, the reference sign 4 indicates a packer for hanging the downhole filter string. The downhole filter string here is a downhole filter string in a broader sense and has a plurality of forms, for instance, in a first circumstance there is a downhole filter string having no flow-restrict function which at this same is only a sand control filter, which is also called as a sand control screen. In a second circumstance, there is a filter having a flow-control function, i.e. a flow-control filter string, which is also called as a flow-control screen. The flow-control filter has a flow-control function, and at the same time has a filtering function, which function is sometimes to prevent anti-channeling particle medium outside the flow-control filter from entering a wellbore and also has the function of preventing formation sand from entering a wellbore for a sand production well. The flow-control function of the flow-control filter embodies a flow-restrict function as well.
The downhole filter string refers to a string formed by connecting one or more downhole filters in series. For example, a sand control screen with a total length of 300 meters which is placed into a horizontal well is formed by connecting sand control screens of about 10 meters in series.
In an oil-gas well containing the downhole filter string, there exist the following two circumstances outside the downhole filter string: one circumstance in which outside the downhole filter string there are artificially filled with gravels which include quartz sands or ceramsites; the other circumstance in which outside the downhole filter string there are no fillers, if there are no fillers outside the downhole filter string, after a period of production by a sand production well, the produced formation sand may also fill up the annulus between the downhole filter string and the borehole wall, as shown in Figure 1, the reference sign 5 in Figure 1 represents formation sands or artificially filled gravels accumulated outside the downhole filter string. Both naturally filled formation sands and artificially filled gravels produce a great resistance for pulling a downhole filter string such that it is difficult to extract a downhole filter string in an oil-gas well, in particular a well having a long downhole filter string, such as a highly-deviated well and a horizontal well, in which it is almost impossible to extract a downhole filter string.
However, it is necessary to extract a downhole filter string under a number of circumstances, such as the following several circumstances:
1. It is necessary to repair a damaged downhole filter string, or to replace a downhole filter string;
DOWNHOLE FILTER STRING AND METHOD FOR EXTRACTING THE
STRING
Technical Field The present invention relates to the oil exploitation field, and specifically relates to an oil-gas well structure for facilitating extracting a downhole filter string and a method for extracting the downhole filter string from the oil-gas well. The oil-gas well here refers to a production well in a broader sense in oil-gas field development, which includes an oil well, a gas well, a natural gas well, an injection well, etc.
Background Art The completion structure of most mechanically sand control oil-gas wells comprises an oil-gas well and a downhole filter string run into the oil-gas well, and the oil-gas well includes a vertical well, a deviated well, a highly-deviated well and a horizontal well. As shown in Figure 1, the reference sign 1 in Figure 1 indicates a borehole wall of an oil-gas well, the reference sign 2 indicates a downhole filter string, the reference sign 3 indicates an annulus between the downhole filter string and the borehole wall, the reference sign 4 indicates a packer for hanging the downhole filter string. The downhole filter string here is a downhole filter string in a broader sense and has a plurality of forms, for instance, in a first circumstance there is a downhole filter string having no flow-restrict function which at this same is only a sand control filter, which is also called as a sand control screen. In a second circumstance, there is a filter having a flow-control function, i.e. a flow-control filter string, which is also called as a flow-control screen. The flow-control filter has a flow-control function, and at the same time has a filtering function, which function is sometimes to prevent anti-channeling particle medium outside the flow-control filter from entering a wellbore and also has the function of preventing formation sand from entering a wellbore for a sand production well. The flow-control function of the flow-control filter embodies a flow-restrict function as well.
The downhole filter string refers to a string formed by connecting one or more downhole filters in series. For example, a sand control screen with a total length of 300 meters which is placed into a horizontal well is formed by connecting sand control screens of about 10 meters in series.
In an oil-gas well containing the downhole filter string, there exist the following two circumstances outside the downhole filter string: one circumstance in which outside the downhole filter string there are artificially filled with gravels which include quartz sands or ceramsites; the other circumstance in which outside the downhole filter string there are no fillers, if there are no fillers outside the downhole filter string, after a period of production by a sand production well, the produced formation sand may also fill up the annulus between the downhole filter string and the borehole wall, as shown in Figure 1, the reference sign 5 in Figure 1 represents formation sands or artificially filled gravels accumulated outside the downhole filter string. Both naturally filled formation sands and artificially filled gravels produce a great resistance for pulling a downhole filter string such that it is difficult to extract a downhole filter string in an oil-gas well, in particular a well having a long downhole filter string, such as a highly-deviated well and a horizontal well, in which it is almost impossible to extract a downhole filter string.
However, it is necessary to extract a downhole filter string under a number of circumstances, such as the following several circumstances:
1. It is necessary to repair a damaged downhole filter string, or to replace a downhole filter string;
2. It is necessary to recycle extracted downhole filter strings so as to save much expenditure.
3. When a flow-control filter string is used, the extraction of a flow-control filter string in the production process may facilitate conveniently regulating the flow-control parameters of the flow-control filter string such as to adapt to the flow requirements of different exploitation stages and improve the production efficiency of an oil-gas well.
At present, there is still no oil-gas well structure facilitating extracting a downhole filter string and a particularly effective method for extracting a downhole filter string from an oil-gas well.
Summary of the Invention The technical problem required to be solved by the present invention is to provide an oil-gas well structure facilitating extracting a downhole filter string and a method for extracting a downhole filter string from the oil-gas well.
In order to solve the aforementioned problem, the present invention uses the following technical solution:
The oil-gas well structure for facilitating extracting a downhole filter string of the present invention comprises a borehole wall and a downhole filter string run into the oil-gas well, one end of the downhole filter string close to the wellhead being an upper end of the filter string which end is fixedly connected with the borehole wall, an annulus being formed between the downhole filter string and the borehole wall; the annulus between the downhole filter string and the borehole wall is filled with ultra light particles, wherein the density of the ultra light particles approaches or is equal to the density of a carrier fluid for carrying the ultra light particles, the carrier fluid for carrying the ultra light particles is a liquid for carrying and conveying the ultra light particles into the annulus or backwashing and conveying the ultra light particles out of the annulus.
The ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.35 to +0.35, which range contains two endpoint values.
Preferably, the ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.3 to +0.3, which range contains two endpoint values.
The ultra light particles are particles which have an average particle diameter of 0.05-1.2 mm, and a real density of 0.7-1.3 g/cm3.
Preferably, the ultra light particles are particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
Preferably, the ultra light particles are macromolecule polymer particles.
Preferably, the ultra light particles are high density polyethylene particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.90-0.98 g/cm3.
Or, the ultra light particles are polypropylene and PVC macromolecule polymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.7-1.3 g/cm3.
Or, the ultra light particles are styrene and divinylbenzene cross-linked copolymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
The present invention also discloses a method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string, which method includes the following steps:
1) Establishing channels: opening an annulus between an upper end of a downhole filter string and a borehole wall;
2) Removing ultra light particles by a carrier fluid for backwashing:
injecting a carrier fluid for ultra light particles into the downhole filter string in order to backwash and carry the ultra light particles away from the annulus;
3) Extracting the downhole filter string.
When the downhole filter string is a flow-control filter string, the step of removing ultra light particles by a carrier fluid for backwashing is in way such as to connect a fluid injection pipe with the downhole filter string and directly inject the carrier fluid for ultra light particles into the flow-control filter string, due to a flow-control effect of the flow-control filter string, the injection fluid is uniformly injected into ultra light particles from various segments of the flow-control filter string, and ultra light particles accumulated outside the downhole filter string are removed by means of an upper fluid flow passage of the downhole filter string.
When the downhole filter string is a flow-control filter string, the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to run a fluid injection pipe into the downhole filter string, said fluid injection pipe performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually run into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed; or it is possible to continuously move the fluid injection pipe to perform fluid injection until ultra light particles outside the downhole filter string are removed.
When the downhole filter string is a downhole filter string having no flow-restrict function, the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to run a fluid injection pipe into the downhole filter string, said fluid injection pipe performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, when ultra light particles outside an anterior segment of the downhole filter string close to the wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed. The fluid injection pipe may be moved in a manner such as to continuously move the fluid injection pipe to perform fluid injection until ultra light particles outside the downhole filter string are removed.
Preferably, the carrier fluid for ultra light particles as defined in the present invention is water or water solution.
The present invention utilizes a carrier fluid for ultra light particles having a density of about 1 g/cm3 and chooses ultra light particles having a real density very close to that of a carrier fluid so that the carrier fluid may easily carry the ultra light particles for filling into an annulus between the downhole filter string and the borehole wall, filling in and filling up the annulus between the downhole filter string and the borehole wall, a part of the carrier fluid enters the downhole filter string and returns to the ground surface and a further part of the carrier fluid penetrates into the formation through the borehole wall; and finally form a completion structure which fill up ultra light particles in the annulus between the downhole filter string and the borehole wall.
At the same time, the ultra light particles occupy the space of the annulus between the downhole filter string and the borehole wall, and also obstruct a accumulating of the formation sand in the space of the annulus between the downhole filter string and the borehole wall.
The present invention chooses particles having an average particle diameter of 0.05-1.2 mm, and a real density of 0.7-1.3 g/cm3 as ultra light particles for filling the annulus between the downhole filter string and the borehole wall, when it is necessary to extract the downhole filter string, it is possible to easily remove ultra light particles accumulated outside the downhole filter string, and as the density of the ultra light particles is very close to that of the carrier fluid, the carrier fluid circulating in a low speed may conveniently take the ultra light particles to the ground and remove the ultra light particles in the annulus outside the downhole filter string so that the downhole filter string may be conveniently extracted from the oil well. The requirements for extracting a downhole filter string are satisfied.
The method as defined in the present invention, which is easy to carry out, overcomes the difficulties in extracting a downhole filter string in an oil well and thus facilitates the production, and moreover, the removed ultra light particles may be recycled, thereby greatly reducing the production cost.
Description of the Drawings Figure 1 is a view of the completion structure as defined in the Background Art.
Figure 2 is a view of the completion structure as defined in the embodiment 1 of the present invention.
Figure 3 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 2 of the present invention.
Figure 4 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 3 of the present invention.
Figure 5 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 4 of the present invention.
Figure 6 is a view of the oil-gas well structure after removing ultra light particles as defined in the present invention.
Detailed description of the preferable embodiments Embodiment 1 As shown in Figure 2, an oil-gas well structure for facilitating extracting a downhole filter string as defined in the present invention comprises an oil-gas well borehole wall 1 and a downhole filter string 2 run into the oil-gas well, a packer 4 for hanging the downhole filter string is provided between one end of the downhole filter string close to the wellhead and the borehole wall, an annulus is formed between the downhole filter string and the borehole wall;
the annulus between the downhole filter string and the borehole wall is filled with ultra light particles 6.
Embodiment 2 A method for extracting a control-flow filter string In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are polypropylene and PVC
macromolecule polymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.7-1.3 g/cm3.
As shown in Figure 3, the downhole filter string, which is a flow-control string filter 2, is provided with a flow-control filter 2-1; the method for extracting the downhole filter string is as follows:
1) Opening a packer for hanging the downhole filter string: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: connect a fluid injection pipe with the downhole filter string and directly inject the carrier fluid for ultra light particles into the flow-control filter string, due to a flow-control effect of the flow-control filter string, the injection fluid is uniformly injected into ultra light particles from various segments of the flow-control filter string; in Figure 3, the arrow direction indicates a flow method of the carrier fluid.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
Embodiment 3 A method for extracting a control-flow filter string In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are styrene and divinylbenzene cross-linked copolymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
As shown in Figure 4, the downhole filter string, which is a flow-control string filter 2, is provided with a flow-control filter 2-1; the method for extracting the downhole filter string is as follows:
1) Opening a packer for hanging the downhole filter string: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: running a fluid injection pipe 7 into the downhole filter string, said fluid injection pipe 7 performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring 8 having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from a top of the downhole filter string, due to an effect of the seal ring, the seal ring may block the carrier fluid injected into the downhole filter string by the fluid injection pipe at a lower side of the seal ring and concentrate the carrier fluid to impact parts deposited with ultra light particles, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for one further segment until those outside the downhole filter string are completely removed; such also avoids that the carrier fluid does not produce the effect of the deposited ultra light particles and saves much carrier fluid. The arrow direction in Figure 4 indicates a flow direction of the carrier fluid. The dotted line in Figure 4 presents that the fluid injection pipe is gradually penetrated into the downhole filter string for sectional fluid injection. The fluid injection pipe may be penetrated into the downhole filter string in a continually uniform-speed penetrating manner. As the continually uniform-speed moving injection pipe gradually injects fluid, the depth after ultra light particles are removed gradually increases until the ultra light particles outside the downhole filter string are completely removed. The arrow direction in Figure 4 indicates a flow method of the carrier fluid.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
Embodiment 4 A method for extracting a downhole filter string having no flow-restrict function In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are high density polyethylene particles which have an average particle diameter of 0.1-0.5 mm, and a real density of 0.94 g/cm3.
As shown in Figure 5, the downhole filter string is a downhole filter string 2 having no flow-restrict function, and the method for extracting the downhole filter string is as follows:
1) Opening the annulus between one end of the downhole filter string close to the wellhead and the borehole wall, establishing a fluid circulating passage at an upper portion of the annulus between one end of the downhole filter string close to the wellhead and the borehole wall: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: running a fluid injection pipe 7 into the downhole filter string, said fluid injection pipe 7 performs fluid injection; at the end of the fluid injection pipe there is provided with a seal ring 8 having an outside diameter substantially identical to an inside diameter of the downhole filter string, a fluid outlet 9 of the fluid injection pipe is at a position slightly lower than the seal ring of the fluid injection pipe, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, due to an effect of the seal ring, the seal ring may block the carrier fluid injected into the downhole filter string by the fluid injection pipe at a lower side of the seal ring inside the downhole filter string so that it is difficult for the carrier fluid to enter the upper side of the seal ring and thus at places where the ultra light particles are removed at an upper side there are no more carrier fluid entering from the filter string, and concentrate the carrier fluid to remove ultra light particles that are required to be removed, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed; such also avoids the run-up of the carrier fluid and thus saves much carrier fluid and maintains a higher flow speed of impacting ultra light particles. The arrow direction in Figure 5 indicates a flow direction of the carrier fluid. The dotted line in the figure presents that the fluid injection pipe is gradually penetrated into the downhole filter string for sectional fluid injection. The fluid injection pipe may be penetrated into the downhole filter string in an intermittently penetrating manner. The intermittently moving injection pipe gradually injects fluid until the ultra light particles outside the downhole filter string are completely removed.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
The carrier fluid as defined in the embodiments 2-4 may be water or a water solution added with common additives for an oil field.
The method as defined in the present invention, which is easy to carry out, overcomes the difficulties in extracting a downhole filter string in an oil well and thus facilitates the production, and moreover, the removed ultra light particles may be recycled, thereby greatly reducing the production cost.
The density of the particles in the present patent refers to a real density of particles.
The present patent also contains a circumstance in which a thinner downhole filter string is secondarily run into an initial downhole filter string of a well that is already present with a downhole filter string. It contains circumstances in which a filter string is run into a casing perforated well, a well with a porous pipe and an open-hole well.
Finally, it is imperative to explicate that: apparently, the aforementioned embodiments only pertain to exemplifications made to clearly present the present invention rather than definitions on the embodiments. On the basis of said descriptions, a person skilled in the art may also make changes or variations of other different forms. Hereby, it is unnecessary and impossible to list all the embodiments. However, the obvious changes or variations deriving therefrom still fall into the protection scope of the present invention.
At present, there is still no oil-gas well structure facilitating extracting a downhole filter string and a particularly effective method for extracting a downhole filter string from an oil-gas well.
Summary of the Invention The technical problem required to be solved by the present invention is to provide an oil-gas well structure facilitating extracting a downhole filter string and a method for extracting a downhole filter string from the oil-gas well.
In order to solve the aforementioned problem, the present invention uses the following technical solution:
The oil-gas well structure for facilitating extracting a downhole filter string of the present invention comprises a borehole wall and a downhole filter string run into the oil-gas well, one end of the downhole filter string close to the wellhead being an upper end of the filter string which end is fixedly connected with the borehole wall, an annulus being formed between the downhole filter string and the borehole wall; the annulus between the downhole filter string and the borehole wall is filled with ultra light particles, wherein the density of the ultra light particles approaches or is equal to the density of a carrier fluid for carrying the ultra light particles, the carrier fluid for carrying the ultra light particles is a liquid for carrying and conveying the ultra light particles into the annulus or backwashing and conveying the ultra light particles out of the annulus.
The ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.35 to +0.35, which range contains two endpoint values.
Preferably, the ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.3 to +0.3, which range contains two endpoint values.
The ultra light particles are particles which have an average particle diameter of 0.05-1.2 mm, and a real density of 0.7-1.3 g/cm3.
Preferably, the ultra light particles are particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
Preferably, the ultra light particles are macromolecule polymer particles.
Preferably, the ultra light particles are high density polyethylene particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.90-0.98 g/cm3.
Or, the ultra light particles are polypropylene and PVC macromolecule polymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.7-1.3 g/cm3.
Or, the ultra light particles are styrene and divinylbenzene cross-linked copolymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
The present invention also discloses a method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string, which method includes the following steps:
1) Establishing channels: opening an annulus between an upper end of a downhole filter string and a borehole wall;
2) Removing ultra light particles by a carrier fluid for backwashing:
injecting a carrier fluid for ultra light particles into the downhole filter string in order to backwash and carry the ultra light particles away from the annulus;
3) Extracting the downhole filter string.
When the downhole filter string is a flow-control filter string, the step of removing ultra light particles by a carrier fluid for backwashing is in way such as to connect a fluid injection pipe with the downhole filter string and directly inject the carrier fluid for ultra light particles into the flow-control filter string, due to a flow-control effect of the flow-control filter string, the injection fluid is uniformly injected into ultra light particles from various segments of the flow-control filter string, and ultra light particles accumulated outside the downhole filter string are removed by means of an upper fluid flow passage of the downhole filter string.
When the downhole filter string is a flow-control filter string, the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to run a fluid injection pipe into the downhole filter string, said fluid injection pipe performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually run into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed; or it is possible to continuously move the fluid injection pipe to perform fluid injection until ultra light particles outside the downhole filter string are removed.
When the downhole filter string is a downhole filter string having no flow-restrict function, the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to run a fluid injection pipe into the downhole filter string, said fluid injection pipe performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, when ultra light particles outside an anterior segment of the downhole filter string close to the wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed. The fluid injection pipe may be moved in a manner such as to continuously move the fluid injection pipe to perform fluid injection until ultra light particles outside the downhole filter string are removed.
Preferably, the carrier fluid for ultra light particles as defined in the present invention is water or water solution.
The present invention utilizes a carrier fluid for ultra light particles having a density of about 1 g/cm3 and chooses ultra light particles having a real density very close to that of a carrier fluid so that the carrier fluid may easily carry the ultra light particles for filling into an annulus between the downhole filter string and the borehole wall, filling in and filling up the annulus between the downhole filter string and the borehole wall, a part of the carrier fluid enters the downhole filter string and returns to the ground surface and a further part of the carrier fluid penetrates into the formation through the borehole wall; and finally form a completion structure which fill up ultra light particles in the annulus between the downhole filter string and the borehole wall.
At the same time, the ultra light particles occupy the space of the annulus between the downhole filter string and the borehole wall, and also obstruct a accumulating of the formation sand in the space of the annulus between the downhole filter string and the borehole wall.
The present invention chooses particles having an average particle diameter of 0.05-1.2 mm, and a real density of 0.7-1.3 g/cm3 as ultra light particles for filling the annulus between the downhole filter string and the borehole wall, when it is necessary to extract the downhole filter string, it is possible to easily remove ultra light particles accumulated outside the downhole filter string, and as the density of the ultra light particles is very close to that of the carrier fluid, the carrier fluid circulating in a low speed may conveniently take the ultra light particles to the ground and remove the ultra light particles in the annulus outside the downhole filter string so that the downhole filter string may be conveniently extracted from the oil well. The requirements for extracting a downhole filter string are satisfied.
The method as defined in the present invention, which is easy to carry out, overcomes the difficulties in extracting a downhole filter string in an oil well and thus facilitates the production, and moreover, the removed ultra light particles may be recycled, thereby greatly reducing the production cost.
Description of the Drawings Figure 1 is a view of the completion structure as defined in the Background Art.
Figure 2 is a view of the completion structure as defined in the embodiment 1 of the present invention.
Figure 3 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 2 of the present invention.
Figure 4 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 3 of the present invention.
Figure 5 is a view of a flow path of the carrier fluid for backwashing and removing ultra light particles outside the filter string as defined in the embodiment 4 of the present invention.
Figure 6 is a view of the oil-gas well structure after removing ultra light particles as defined in the present invention.
Detailed description of the preferable embodiments Embodiment 1 As shown in Figure 2, an oil-gas well structure for facilitating extracting a downhole filter string as defined in the present invention comprises an oil-gas well borehole wall 1 and a downhole filter string 2 run into the oil-gas well, a packer 4 for hanging the downhole filter string is provided between one end of the downhole filter string close to the wellhead and the borehole wall, an annulus is formed between the downhole filter string and the borehole wall;
the annulus between the downhole filter string and the borehole wall is filled with ultra light particles 6.
Embodiment 2 A method for extracting a control-flow filter string In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are polypropylene and PVC
macromolecule polymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.7-1.3 g/cm3.
As shown in Figure 3, the downhole filter string, which is a flow-control string filter 2, is provided with a flow-control filter 2-1; the method for extracting the downhole filter string is as follows:
1) Opening a packer for hanging the downhole filter string: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: connect a fluid injection pipe with the downhole filter string and directly inject the carrier fluid for ultra light particles into the flow-control filter string, due to a flow-control effect of the flow-control filter string, the injection fluid is uniformly injected into ultra light particles from various segments of the flow-control filter string; in Figure 3, the arrow direction indicates a flow method of the carrier fluid.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
Embodiment 3 A method for extracting a control-flow filter string In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are styrene and divinylbenzene cross-linked copolymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
As shown in Figure 4, the downhole filter string, which is a flow-control string filter 2, is provided with a flow-control filter 2-1; the method for extracting the downhole filter string is as follows:
1) Opening a packer for hanging the downhole filter string: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: running a fluid injection pipe 7 into the downhole filter string, said fluid injection pipe 7 performs fluid injection; a lower portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring 8 having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from a top of the downhole filter string, due to an effect of the seal ring, the seal ring may block the carrier fluid injected into the downhole filter string by the fluid injection pipe at a lower side of the seal ring and concentrate the carrier fluid to impact parts deposited with ultra light particles, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for one further segment until those outside the downhole filter string are completely removed; such also avoids that the carrier fluid does not produce the effect of the deposited ultra light particles and saves much carrier fluid. The arrow direction in Figure 4 indicates a flow direction of the carrier fluid. The dotted line in Figure 4 presents that the fluid injection pipe is gradually penetrated into the downhole filter string for sectional fluid injection. The fluid injection pipe may be penetrated into the downhole filter string in a continually uniform-speed penetrating manner. As the continually uniform-speed moving injection pipe gradually injects fluid, the depth after ultra light particles are removed gradually increases until the ultra light particles outside the downhole filter string are completely removed. The arrow direction in Figure 4 indicates a flow method of the carrier fluid.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
Embodiment 4 A method for extracting a downhole filter string having no flow-restrict function In the completion structure as shown in Figure 2 and as defined in the embodiment 1, the ultra light particles are high density polyethylene particles which have an average particle diameter of 0.1-0.5 mm, and a real density of 0.94 g/cm3.
As shown in Figure 5, the downhole filter string is a downhole filter string 2 having no flow-restrict function, and the method for extracting the downhole filter string is as follows:
1) Opening the annulus between one end of the downhole filter string close to the wellhead and the borehole wall, establishing a fluid circulating passage at an upper portion of the annulus between one end of the downhole filter string close to the wellhead and the borehole wall: for a packer unset by pulling, the opening method is in a way such that the packer is unset automatically when the packer is pulled. For a packer unset by rotating, the packer is unset automatically when the packer is rotated. Between the unset packer and the borehole wall there exists a gap which becomes a fluid circulating passage.
2) Removing ultra light particles by a carrier fluid for backwashing: running a fluid injection pipe 7 into the downhole filter string, said fluid injection pipe 7 performs fluid injection; at the end of the fluid injection pipe there is provided with a seal ring 8 having an outside diameter substantially identical to an inside diameter of the downhole filter string, a fluid outlet 9 of the fluid injection pipe is at a position slightly lower than the seal ring of the fluid injection pipe, the fluid injection being in a sectional manner; the fluid injection pipe is gradually penetrated into a bottom of the downhole filter string for sectional fluid injection and sectional removal of ultra light particles outside the downhole filter string from the top of the downhole filter string, due to an effect of the seal ring, the seal ring may block the carrier fluid injected into the downhole filter string by the fluid injection pipe at a lower side of the seal ring inside the downhole filter string so that it is difficult for the carrier fluid to enter the upper side of the seal ring and thus at places where the ultra light particles are removed at an upper side there are no more carrier fluid entering from the filter string, and concentrate the carrier fluid to remove ultra light particles that are required to be removed, when ultra light particles outside an anterior segment of the downhole filter string close to a wellhead are removed, the fluid injection pipe is penetrated into the downhole filter string for another segment until those outside the downhole filter string are completely removed; such also avoids the run-up of the carrier fluid and thus saves much carrier fluid and maintains a higher flow speed of impacting ultra light particles. The arrow direction in Figure 5 indicates a flow direction of the carrier fluid. The dotted line in the figure presents that the fluid injection pipe is gradually penetrated into the downhole filter string for sectional fluid injection. The fluid injection pipe may be penetrated into the downhole filter string in an intermittently penetrating manner. The intermittently moving injection pipe gradually injects fluid until the ultra light particles outside the downhole filter string are completely removed.
3) Removing: ultra light particles are taken out of the well by the carrier fluid until the ultra light particles accumulated outside the downhole filter string are removed; the structure of oil-gas well after removal is as shown in Figure 6.
4) Extracting the downhole filter string.
The carrier fluid as defined in the embodiments 2-4 may be water or a water solution added with common additives for an oil field.
The method as defined in the present invention, which is easy to carry out, overcomes the difficulties in extracting a downhole filter string in an oil well and thus facilitates the production, and moreover, the removed ultra light particles may be recycled, thereby greatly reducing the production cost.
The density of the particles in the present patent refers to a real density of particles.
The present patent also contains a circumstance in which a thinner downhole filter string is secondarily run into an initial downhole filter string of a well that is already present with a downhole filter string. It contains circumstances in which a filter string is run into a casing perforated well, a well with a porous pipe and an open-hole well.
Finally, it is imperative to explicate that: apparently, the aforementioned embodiments only pertain to exemplifications made to clearly present the present invention rather than definitions on the embodiments. On the basis of said descriptions, a person skilled in the art may also make changes or variations of other different forms. Hereby, it is unnecessary and impossible to list all the embodiments. However, the obvious changes or variations deriving therefrom still fall into the protection scope of the present invention.
Claims (14)
1. An oil-gas well structure for facilitating extracting a downhole filter string, comprising a borehole wall and a downhole filter string run into the oil-gas well, one end of the downhole filter string close to the wellhead being an upper end of the filter string which end is fixedly connected with the borehole wall, an annulus being formed between the downhole filter string and the borehole wall;
characterized in that: the annulus between the downhole filter string and the borehole wall is filled with ultra light particles whose density approaches or is equal to the density of a carrier fluid for carrying the ultra light particles, the carrier fluid for carrying the ultra light particles is a liquid for carrying and conveying the ultra light particles into the annulus or backwashing and conveying the ultra light particles out of the annulus.
characterized in that: the annulus between the downhole filter string and the borehole wall is filled with ultra light particles whose density approaches or is equal to the density of a carrier fluid for carrying the ultra light particles, the carrier fluid for carrying the ultra light particles is a liquid for carrying and conveying the ultra light particles into the annulus or backwashing and conveying the ultra light particles out of the annulus.
2. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 1, characterized in that: the ultra light particles are particles which have an average particle diameter of 0.05-1.2 mm, and a real density of 0.7-1.3 g/cm3.
3. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 2, characterized in that: the ultra light particles are particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
4. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 2 or 3, characterized in that: the ultra light particles are macromolecule polymer particles.
5. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 2, characterized in that: the ultra light particles are high density polyethylene particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.90-0.98 g/cm3.
6. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 2, characterized in that: the ultra light particles are polypropylene and PVC macromolecule polymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.7-1.3 g/cm3.
7. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 4, characterized in that: the ultra light particles are styrene and divinylbenzene cross-linked copolymer particles which have an average particle diameter of 0.05-0.8 mm, and a real density of 0.94-1.08 g/cm3.
8. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 1, characterized in that: the ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.35 to +0.35, which range contains two endpoint values.
9. The oil-gas well structure for facilitating extracting a downhole filter string according to claim 8, characterized in that: the ultra light particles and the carrier fluid for the ultra light particles have a density difference within a range of from -0.3 to +0.3, which range contains two endpoint values.
10. A method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string according to any one of claims 1-9, characterized in that, the method including the following steps:
1) establishing channels by opening an annulus between an upper end of a downhole filter string and a borehole wall;
2) removing ultra light particles by a carrier fluid for backwashing:
injecting a carrier fluid for ultra light particles into the downhole filter string in order to backwash and carry the ultra light particles away from the annulus;
3) extracting the downhole filter string.
1) establishing channels by opening an annulus between an upper end of a downhole filter string and a borehole wall;
2) removing ultra light particles by a carrier fluid for backwashing:
injecting a carrier fluid for ultra light particles into the downhole filter string in order to backwash and carry the ultra light particles away from the annulus;
3) extracting the downhole filter string.
11. The method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string according to claim 10, characterized in that: the downhole filter string is a flow-control filter string, the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to connect a fluid injection pipe with the downhole filter string and directly inject the carrier fluid for ultra light particles into the flow-control filter string.
12. The method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string according to claim 10, characterized in that: the step of removing ultra light particles by a carrier fluid for backwashing is in a way such as to run a fluid injection pipe into the downhole filter string, said fluid injection pipe performs fluid injection; a lower
13 portion of the fluid injection pipe has an opening an upper portion of which is provided with a seal ring having an outside diameter substantially identical to an inside diameter of the downhole filter string, the fluid injection being in a sectional manner.
13. The method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string according to any one of claims 10-12, characterized in that: the carrier fluid for ultra light particles is water or water solution.
13. The method for extracting a downhole filter string from the oil-gas well structure for facilitating extracting a downhole filter string according to any one of claims 10-12, characterized in that: the carrier fluid for ultra light particles is water or water solution.
14
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910250794.6 | 2009-12-11 | ||
| CN200910250794A CN101701517B (en) | 2009-12-11 | 2009-12-11 | Method for facilitating pulling out of downhole filter pipe from oil and gas well structure |
| PCT/CN2010/002015 WO2011069340A1 (en) | 2009-12-11 | 2010-12-10 | Oil-gas well structure for facilitating extracting downhole filter string and method for extracting string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2783392A1 true CA2783392A1 (en) | 2011-06-16 |
Family
ID=42156441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2783392A Abandoned CA2783392A1 (en) | 2009-12-11 | 2010-12-10 | Oil-gas well structure for facilitating extracting a downhole filter string and method for extracting the string |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20120279716A1 (en) |
| CN (1) | CN101701517B (en) |
| CA (1) | CA2783392A1 (en) |
| GB (1) | GB2489161B (en) |
| NO (1) | NO346845B1 (en) |
| WO (1) | WO2011069340A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705808B (en) * | 2009-12-11 | 2012-05-30 | 安东石油技术（集团）有限公司 | Sectional flow control method for flow control filter pipe column of oil-gas well with bushing outside channel |
| CN101705802B (en) | 2009-12-11 | 2013-05-15 | 安东石油技术（集团）有限公司 | Anti-crossflow packing particles for production sections of oil and gas wells |
| CN101701517B (en) * | 2009-12-11 | 2012-09-05 | 安东石油技术（集团）有限公司 | Method for facilitating pulling out of downhole filter pipe from oil and gas well structure |
| US9482070B2 (en) * | 2012-05-08 | 2016-11-01 | Shell Oil Company | Method and system for sealing an annulus enclosing a tubular element |
| CN108798548B (en) * | 2017-05-01 | 2024-01-23 | 刘向京 | Annular flow control nipple of oil and gas well and application method thereof |
| CN112267855B (en) * | 2020-09-22 | 2023-02-07 | 中国石油天然气股份有限公司 | Flow-regulating water-controlling sand-preventing well completion pipe string and sand filling method |
| CN113266304B (en) * | 2021-07-01 | 2022-06-07 | 中国石油大学(华东) | Penetrating hydrate layer cementing method for prolonging long-acting production life of oil and gas well |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1379815A (en) * | 1920-07-30 | 1921-05-31 | Hall James Robert | Oil-well screen and liner cleaner |
| US2018283A (en) * | 1933-12-09 | 1935-10-22 | Schweitzer | Method and means for well development |
| US3460616A (en) * | 1967-07-26 | 1969-08-12 | Dresser Ind | Retrievable packer |
| US4733729A (en) * | 1986-09-08 | 1988-03-29 | Dowell Schlumberger Incorporated | Matched particle/liquid density well packing technique |
| US4793411A (en) * | 1988-06-29 | 1988-12-27 | Halliburton Company | Retrievable gravel packer and retrieving tool |
| US5623993A (en) * | 1992-08-07 | 1997-04-29 | Baker Hughes Incorporated | Method and apparatus for sealing and transfering force in a wellbore |
| GB2269840B (en) * | 1992-08-19 | 1996-05-01 | Solinst Canada Ltd | Injecting particulate material into boreholes |
| US5404951A (en) * | 1993-07-07 | 1995-04-11 | Atlantic Richfield Company | Well treatment with artificial matrix and gel composition |
| US5913365A (en) * | 1997-04-08 | 1999-06-22 | Mobil Oil Corporation | Method for removing a gravel pack screen |
| EP0909875A3 (en) * | 1997-10-16 | 1999-10-27 | Halliburton Energy Services, Inc. | Method of completing well in unconsolidated subterranean zone |
| US7527095B2 (en) * | 2003-12-11 | 2009-05-05 | Shell Oil Company | Method of creating a zonal isolation in an underground wellbore |
| AU2005212638B2 (en) * | 2004-02-12 | 2007-11-29 | Shell Internationale Research Maatschappij B.V. | Suppressing fluid communication to or from a wellbore |
| US7845409B2 (en) * | 2005-12-28 | 2010-12-07 | 3M Innovative Properties Company | Low density proppant particles and use thereof |
| US7624802B2 (en) * | 2007-03-22 | 2009-12-01 | Hexion Specialty Chemicals, Inc. | Low temperature coated particles for use as proppants or in gravel packs, methods for making and using the same |
| CN101701517B (en) * | 2009-12-11 | 2012-09-05 | 安东石油技术（集团）有限公司 | Method for facilitating pulling out of downhole filter pipe from oil and gas well structure |
-
2009
- 2009-12-11 CN CN200910250794A patent/CN101701517B/en active Active
-
2010
- 2010-12-10 WO PCT/CN2010/002015 patent/WO2011069340A1/en active Application Filing
- 2010-12-10 CA CA2783392A patent/CA2783392A1/en not_active Abandoned
- 2010-12-10 NO NO20120798A patent/NO346845B1/en unknown
- 2010-12-10 GB GB201211951A patent/GB2489161B/en active Active
- 2010-12-10 US US13/514,505 patent/US20120279716A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN101701517B (en) | 2012-09-05 |
| CN101701517A (en) | 2010-05-05 |
| GB2489161B (en) | 2015-05-13 |
| US20120279716A1 (en) | 2012-11-08 |
| NO346845B1 (en) | 2023-01-30 |
| WO2011069340A1 (en) | 2011-06-16 |
| GB201211951D0 (en) | 2012-08-15 |
| GB2489161A (en) | 2012-09-19 |
| NO20120798A1 (en) | 2012-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20120279716A1 (en) | Oil-Gas Well Structure for Facilitating Extracting a Downhole Filter String and Method for Extracting the String | |
| US6857476B2 (en) | Sand control screen assembly having an internal seal element and treatment method using the same | |
| US5862863A (en) | Dual completion method for oil/gas wells to minimize water coning | |
| CA2694074C (en) | Hydrocarbon sweep into horizontal transverse fractured wells | |
| CA2935997C (en) | Downhole oil/water separation system for improved injectivity and reservoir recovery | |
| US8316938B2 (en) | Subterranean water production, transfer and injection method and apparatus | |
| WO2021022908A1 (en) | Method for replacing filling layer without changing pipe string, flowback service device and well completion structure | |
| EP3346090A1 (en) | Systems and apparatuses for separating wellbore fluids and solids during production | |
| US10378328B2 (en) | Systems and apparatuses for separating wellbore fluids and solids during production | |
| CN207122305U (en) | The oil gas well completion structure of decreasing water cut and increasing oil ability can be improved | |
| RU2334867C1 (en) | Method of simultaneous-separate operation of several payout beds and installation of well for implementation of this method | |
| CN108060915A (en) | The completion structure of decreasing water cut and increasing oil ability can be improved | |
| US6923259B2 (en) | Multi-lateral well with downhole gravity separation | |
| RU2480581C1 (en) | Method to isolate inflow of reservoir water in low-angle and horizontal wells | |
| RU2418162C1 (en) | Method for improving permeability of bed during extraction of high-viscosity oil | |
| CN215672154U (en) | Water injection well | |
| WO2022183898A1 (en) | Method for operating water injection well, and water injection well | |
| Dehghani | Oil well sand production control | |
| WO2015035509A1 (en) | Systems and apparatuses for separating wellbore fluids and solids during production | |
| RU2732746C1 (en) | Method for development of powerful low-permeable oil deposit with application of water and gas pumping | |
| Danyluk et al. | Field trial of the first desanding system for downhole oil/water separation in a heavy-oil application | |
| Pakhomov et al. | The innovative method of isolating water in the bottomhole zone of a production well | |
| RU2540714C1 (en) | Oil deposit development method | |
| RU2200229C2 (en) | Manner of operation of injection well | |
| CN2771515Y (en) | Protective pump line equipment for electric oil-submersible pump production opreation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20131121 |
|
| FZDE | Discontinued |
Effective date: 20170705 |