CN110805408A - Profile control process method for water injection well with packer pipe column - Google Patents
Profile control process method for water injection well with packer pipe column Download PDFInfo
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- CN110805408A CN110805408A CN201910467637.4A CN201910467637A CN110805408A CN 110805408 A CN110805408 A CN 110805408A CN 201910467637 A CN201910467637 A CN 201910467637A CN 110805408 A CN110805408 A CN 110805408A
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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Abstract
The invention discloses a profile control process method for a water injection well with a packer pipe column, which comprises the following steps: firstly, measuring the distance h between a profile control target layer and a packer which is closest to the lower part in real time; and secondly, comparing the distance h with a preset distance value interval, and correspondingly executing different profile control construction operations according to a comparison result. The invention discloses a profile control process method for a water injection well with a packer pipe column, which can realize profile control of a particle profile control agent on the water injection well with the packer pipe column, effectively solves the problem that the packer pipe column is clamped due to the sedimentation effect of the particle profile control agent, and has great production practice significance.
Description
Technical Field
The invention relates to the technical field of water injection and oil recovery in the oilfield development process, in particular to a profile control process method for a water injection well with a packer pipe column.
Background
In the field of oil field development, wells from which oil is produced directly from an oil field are known as oil wells or production wells. While wells used to inject water into a formation to increase or stabilize the production of an oil well are referred to as water injection wells or water wells.
At present, the profile control technology is a necessary means for further improving the water absorption profile, expanding the water drive wave and volume and improving the water drive efficiency after the water injection of the water injection well of the oil field. It should be noted that the water injection well profile control technology specifically includes: for the oil field developed by water injection, a packer and a water distributor are adopted to separate water absorption layers and distribute water in a layered manner. Or a chemical method is adopted to inject chemical agents (such as profile control agents) into the high water absorption layer, so that the permeability of the near-wellbore area of the water injection well is reduced, or the high water absorption layer section or a large pore is blocked, so that the water absorption capacity of the high water absorption layer is controlled, the injection pressure is increased, the water absorption capacity of the low water absorption layer is increased, and the purposes of improving the water absorption profile, increasing the swept volume and increasing the recovery ratio are achieved. The packer is a special tool for sealing and isolating oil, gas and water layers in a downhole pipe sleeve (a downhole pipe column or a shaft), and in the well completion process of an oil-gas well, the annular space between an oil pipe and the casing (namely the oil casing annular space) needs to be sealed through the packer so as to prevent natural gas in an oil layer from entering the oil casing annular space and corroding the oil pipe and the casing. The oil casing is a steel pipe used for supporting the wall of an oil well or a gas well to ensure the normal operation of the whole oil well after the drilling process and the completion, and the oil pipe is positioned inside the hollow casing and is a pipeline for transporting crude oil and natural gas from a hydrocarbon reservoir to the surface after the drilling is finished.
However, there are technical limitations in performing profile control of a particulate profile control agent having a specific gravity greater than that of water in a water injection well with a packer string. The main points are as follows: when profile control is performed on a profile control target layer above the packer, the packer in the shaft can be buried by the granular profile control agent with the specific gravity being greater than that of water due to the sedimentation effect. In the profile control operation process, the distance between the packer and the profile control target layer exceeds more than 10 meters, and the particle profile control agent is deposited on the packer in the oil sleeve annulus, so that the packer pipe column is blocked due to sand setting easily, the packer pipe column breaks down, the overhaul operation is required, and the construction cost is greatly increased.
Therefore, when the profile control is carried out on the water injection well with the packer pipe column, the existing profile control process can only avoid using the particle profile control agent as far as possible, and the use of the conventional particle profile control agent is limited. Meanwhile, the use of a granular profile control agent with a specific gravity greater than that of water for profile control also lacks a corresponding profile control process method.
Meanwhile, as is well known, the most commonly used polymer gel channeling sealing capability in profile control is limited, and the profile control channeling sealing strength can be greatly improved by using a particle profile control agent. Especially aiming at the profile control of large pore canal strata commonly occurring in loose sandstone oil reservoirs, the commonly used particle profile control agent with specific gravity larger than water, such as water swelling particles, rubber particles, fly ash, oil well cement and the like, can realize high-strength channeling sealing, and can reduce the cost of the profile control agent compared with polymer gel. On the other hand, as the development of oilfield flooding begins to gradually promote the needs of fine zonal flooding, adjustment of multilayer systems and the like, the profile control of the flooding well with the packer string is more and more. Once the large pore stratum of the well with the packer pipe column needs to be subjected to high-strength profile control, the selection type of the existing particle profile control agent cannot meet the profile control requirement of a specific water injection well due to the fact that the particle profile control agent which is larger than water cannot be selected.
Therefore, it is necessary to implement a profile control with a particle profile control agent in a water injection well with a packer string.
Disclosure of Invention
In view of the above, the present invention provides a water injection well profile control method with a packer string, which can implement profile control of a particle profile control agent in a water injection well with a packer string, effectively solve the problem that the particle profile control agent blocks the packer string due to sedimentation, and has great production practice significance.
Therefore, the invention provides a profile control process method for a water injection well with a packer pipe column, which comprises the following steps:
firstly, measuring the distance h between a profile control target layer and a packer which is closest to the lower part in real time;
and secondly, comparing the distance h with a preset distance value interval, and correspondingly executing different profile control construction operations according to a comparison result.
In the second step, the preset distance value interval is as follows: a distance value interval of more than or equal to 10 meters to less than or equal to 100 meters.
In the second step, when the distance h is lower than the minimum value of the preset distance value interval, executing a first profile control construction operation.
The first profile control construction operation is as follows: the profile control agent is injected into the annulus between the packer and the target layer of profile control by using the profile control pump used in the profile control operation.
In the second step, when the distance h is within the preset distance value interval, executing second profile control construction operation;
the second profile control construction operation specifically comprises the following steps:
A) gradually injecting weighted mud into an annular space between the packer and a profile control target layer, so that the weighted mud is deposited and covers the upper surface of the packer;
B) injecting a granular profile control agent slug with specific gravity greater than that of water;
C) and continuously injecting weighted slurry on the granular profile control agent to serve as a displacement slug to finish construction.
Wherein, in step A), the molar ratio is 3m3The displacement of/h injects weighting mud.
In step C), specifically in terms of 6m3The displacement of/h injects weighting mud.
Wherein, in the second profile control construction operation, the weighted slurry has a specific gravity of 1.5-2.0 and a viscosity of more than 200mPa & S.
Wherein in the second profile control construction operation, the weighting mud is waste drilling mud;
and when the specific gravity of the waste drilling mud is lower than 1.5, adding barite powder into the waste drilling mud until the specific gravity of the waste drilling mud is between 1.5 and 2.0.
In the second profile control construction operation, the weighted slurry comprises water, bentonite, polyacrylamide and barite powder, and the mass ratio of the components is 100: 5: (0.1-0.5): (1-25).
In the second step, when the distance h is larger than the maximum value of the preset distance value interval, executing third profile control construction operation;
the third profile control construction operation specifically comprises the following steps:
step a1) injecting a profile control system comprising a particulate profile control agent having a specific gravity of less than 1.0 into an annulus located between a packer and a zone of interest for profile control. Thus, the annulus between the packer and the profile control target layer is filled with a profile control system of the particle profile control agent with the specific gravity less than 1.0;
step B1) finally, polyacrylamide solution is injected to serve as a displacement slug, and meanwhile, the particle profile control agent with the specific gravity of less than 1.0 floats on the annular space and cannot be deposited to block the packer.
Wherein the particle profile control agent with the specific gravity less than 1.0 comprises any one of soft rubber particles, floating beads, hollow glass beads or coated rice hull powder;
the profile control system comprises base liquid and particles with the specific gravity less than 1.0, and the mass part ratio of the base liquid to the particles is 100: (0-3), wherein the base fluid comprises any one of clay slurry, polyacrylamide solution and polyacrylamide gel.
Compared with the prior art, the technical scheme provided by the invention has the advantages that the profile control process method for the water injection well with the packer string can realize the profile control of the particle profile control agent on the water injection well with the packer string, effectively solves the problem that the packer string is clamped by the particle profile control agent due to the sedimentation effect, and has great production practice significance.
Drawings
FIG. 1 is a flow chart of a water injection well profile control process with a packer string according to the present invention;
fig. 2 is a schematic diagram of the position relationship between a profile control target layer and a packer and a construction pipe column in the water injection well profile control process method with the packer pipe column provided by the invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1 and 2, the invention provides a water injection well profile control process method with a packer string, which is used for profile control operation of a water injection well with a packer string in an oil field, in particular to profile control of a particle profile control agent with specific gravity larger than that of water in the water injection well with the packer string, and can further improve a water absorption profile, enlarge water drive waves and volume and improve water drive efficiency after the water injection well is injected with water. The method is used for solving the problems that the packer pipe column is blocked due to deposition of the particle profile control agent in the profile control operation of the water injection well with the packer pipe column, the selection types of the particle profile control agent are few, and the method can solve the problem that the corresponding profile control process method is lacked when the particle profile control agent with the specific gravity larger than that of water is used for profile control.
Referring to fig. 1, the profile control process method for a water injection well with a packer string provided by the invention specifically comprises the following steps:
firstly, measuring the size of the distance h between a profile control target layer and a packer which is closest to the lower part (namely the first packer at the lower part) in real time;
and secondly, comparing the distance h with a preset distance value interval, and correspondingly executing different profile control construction operations according to a comparison result.
It should be noted that, for the present invention, in the first step, regarding the distance h between the profile control target zone and the nearest packer below (i.e. the first packer below), the method for obtaining the distance h is mainly three types: firstly, a cable with magnetic positioning is put into the oil pipe, and all positions in the well are measured, so that h is obtained. And secondly, the data of the well completion pipe column is consulted, one well is put into production after well completion, the structures of all production layers and pipe columns are determined, and the positions of all parts of the target layer and the water injection pipe column for implementing the operation of the profile control measure can be found. And thirdly, recording the depth of each production layer and the position of the packer by looking up water injection construction summary, such as water absorption profile test data. However, the first method is generally not used by the production unit, and the latter two methods are generally used. Because the current production cost is high, if a special tool is required to be put in for measurement, the time is consumed, and the production cost is increased.
In the invention, the profile control target layer is a layer which is required to be plugged by a profile control agent and possibly has a dominant channel or a water channeling channel by explaining and analyzing data such as a water absorption profile, a tracer, a pressure drop curve, a water absorption indication curve and the like of a water injection well.
Referring to fig. 2, for a water injection well, the top of the water injection well is provided with a well head 1, wherein the water injection well comprises a casing 2, the inside of the casing 2 is provided with a tubing 3, and the annular space between the tubing 3 and the casing 2 is an oil casing annulus 4.
It should be noted that the oil casing annulus 4 functions as: and a closed circulation channel for well washing operation is formed by the annular space and the oil pipe 3 in the water injection well.
In the injection well, a first packer 5 and a second packer 6 are also provided, wherein the first packer 5, which is located in the annulus region closest below the profile control target zone a, serves to separate the adjacent production zones B. And the second packer 6, is the second packer below the profile target zone a. In addition, the tail end of a water injection pipe column (namely a sleeve) of the water injection well is provided with a bell mouth 7, and when the pipe column is lifted for operation, the bell mouth is seen, so that the condition that the oil pipe is lifted or no oil pipe is tripped and falls into the well is indicated. In addition, the bottom of the water well is an artificial well bottom 8, and h is the distance between the bottom end of the layer for profile control and a packer (a first packer) which is closest to the bottom.
It should be noted that the profile control process method provided by the invention is directed at a water injection string with a packer, namely, the water injection string is connected with the packer, so as to realize water injection to a certain layer position.
In the second step, in terms of specific implementation, the preset distance value interval may be set according to the needs of the user, and for example, it may be preferable that: a distance value interval of more than or equal to 10 meters to less than or equal to 100 meters.
It should be noted that, taking the commonly used casing outer diameter of 139mm and oil pipe outer diameter of 73mm for a completion string of a large port oil field, and the commonly used water-swelling particle profile control agent as an example, the indoor simulation result is: when the distance h between the profile control target layer and the packer which is closest to the lower part is more than or equal to 10m, the pipe column with the packer is easy to be clamped and cannot be lifted out. And under the existing process conditions, when h is more than 100m, profile control operation is not generally carried out under the condition of no moving of a tubular column.
In the second step, for the present invention, according to the size of the distance h between the layer of interest for profile control and the nearest packer below (i.e. the first packer below), there are three cases, where different profile construction operations are performed, i.e. different, applicable types and processes of particulate profile control agent are performed correspondingly. The method comprises the following specific steps:
in the second step, specifically, when the distance h is lower than the minimum value of the preset distance value interval (for example, h <10.0m), executing a first profile control construction operation;
in the second step, specifically, when the distance h is within a preset distance value interval (i.e. h is more than or equal to 10.0m and less than or equal to 100m), executing second profile control construction operation;
in the second step, specifically, when the distance h is greater than the maximum value of the preset distance value interval (i.e. h >100m), a third profile control construction operation is performed.
In the present invention, in the second step, the first profile control construction operation specifically includes the steps of:
the common (or conventional) profile control pump used for profile control operation is utilized to inject the profile control agent between the annular space between the packer and the profile control target layer (namely the annular space between the oil pipe and the casing pipe and the annular space of the oil casing), namely the profile control agent is injected into the original water injection pipe column.
It should be noted that any particulate profile control agent currently available may be used in the first profile control operation.
In the second step, specifically, when the distance h is within a preset distance value interval (i.e. h is more than or equal to 10.0m and less than or equal to 100m), executing second profile control construction operation;
the second profile control construction operation specifically comprises the following steps:
A) gradually injecting weighted mud into an annular space between the packer and a profile control target layer (namely the annular space between the oil pipe and the casing pipe, namely the oil casing annular space), so that the weighted mud is deposited and covers the upper surface of the packer;
B) injecting a slug of a particulate profile control agent having a specific gravity greater than that of water (i.e., greater than 1);
in particular, the particle profile control agent with the specific gravity of more than 1.0 comprises water-swelling particles, rubber particles, fly ash and the like.
C) And continuously injecting weighted slurry on the granular profile control agent to serve as a displacement slug to finish construction.
It should be noted that, with the present invention, by this step a), the particle profile control agent injected in the next step B) can be prevented from depositing on the surface of the packer, and the particle profile control agent is prevented from blocking the packer string.
In step A), the specific implementation is as follows, according to 3m3The displacement of/h injects weighting mud.
In step C), specifically in terms of 6m3The displacement of/h injects weighting mud.
In particular, a profile control pump for profile control operations may be used to inject weighting mud and profile control agents.
In step A), the slurry is a semi-fluid formed by mixing soil and water. The weight-added slurry has a specific gravity of 1.5 to 2.0 (the specific gravity of water is 1 relative to water), and has a viscosity of more than 200 mPas.
In particular, the weighted mud is preferably waste drilling mud;
and when the specific gravity of the waste drilling mud is lower than 1.5, adding barite powder into the waste drilling mud until the specific gravity of the waste drilling mud is between 1.5 and 2.0.
Of course, if the specific gravity of the waste drilling mud exceeds the design value (i.e., 1.5-2.0), no adjustment is made.
In particular, the total volume V of the weighted mud is equal to 2+0.1 × h (m)3)。
It should be noted that the waste drilling mud is adopted, so that the effect of the invention can be realized, the waste can be utilized, and the environment is facilitated.
It should be noted that the barite powder, also called barium sulfate powder, belongs to an orthorhombic (orthorhombic) crystal system of sulfate mineral. Usually, the crystal is thick plate-like or columnar crystal, and is often a dense block-like or plate-like or granular aggregate.
Specifically, if no waste drilling mud is generated during construction, weighting mud is prepared, wherein the weighting mud comprises water, bentonite, polyacrylamide and barite powder, and the mass ratio of the components is 100: 5: (0.1-0.5): (1-25).
That is, 100 parts of water, 5 parts of bentonite and 0.1-0.5 part of polyacrylamide are stirred and dissolved uniformly, and then 1-25 parts of barite powder is added to increase the weight of the mixture to the designed specific weight of the weighted slurry.
It is noted that in the present invention, during the second profile construction operation, a weighted slurry is used as the suspension pad, and a particulate profile agent having a specific gravity less than that of the weighted slurry is used. Namely, a small amount of weighting slurry system is injected from small displacement, so that the slurry system is deposited in an annular space (space around a packer pipe column) between the packer and a profile control target layer, and the particle profile control agent is prevented from being deposited on the packer. And then a slug of particulate profile control agent (i.e., as a middle slug) is injected. And finally injecting heavy mud with large discharge amount as a displacement slug.
In particular, in the second profile control operation, the specific gravity of the weighted slurry is at most 2.0, i.e., the specific gravity of the particles of the particulate profile control agent is at most 2.0.
In the second step, specifically, the third profile control construction operation specifically includes the following steps:
step a1) a profile control system containing particulate profile control agent having a specific gravity of less than 1.0 is injected into the annulus between the packer and the zone of interest to be profiled (i.e., the annulus between the tubing and the casing, i.e., the oil casing annulus). Thus, the annulus between the packer and the profile control target layer is filled with a profile control system of the particle profile control agent with the specific gravity less than 1.0;
step B1) finally, polyacrylamide solution is injected to serve as a displacement slug, and meanwhile, the particle profile control agent with the specific gravity of less than 1.0 floats on the annular space and cannot be deposited to block the packer.
Wherein the granular profile control agent with specific gravity less than 1.0 can comprise one of soft rubber granules (specifically high-elasticity soft rubber granules), floating beads, hollow glass beads or coated rice hull powder.
Wherein, the profile control system comprises base fluid and particles with the specific gravity less than 1.0, and the mass part ratio of the base fluid to the particles is 100: (0-3). Wherein the base liquid comprises any one of clay slurry, polyacrylamide solution and polyacrylamide gel.
In particular, the existing particulate profile control agents with specific gravity less than water include: floating beads, hollow glass beads and carbonized rice hulls.
In the third profile control construction operation, a profile control system with particle specific gravity smaller than 1.0 is adopted to fill the annulus between the packer and the profile control target layer (namely the annulus between the oil pipe and the casing pipe, namely the oil sleeve annulus), and then a small amount of polyacrylamide solution with certain viscosity is replaced, so that the profile control agent cannot be deposited to block the packer in the whole construction process.
It should be noted that for the case of h >100m, considering that the distance from the target zone to the annular space between the packers is too long, the weighted mud is inevitably diluted downhole, some particulate profile control agent is always deposited on the packers, and for safety reasons, a profile control system with a particle specific gravity smaller than that of water (i.e. a specific gravity smaller than 1.0) is used, as further described below:
in particular implementation, the granular profile control agent with the specific gravity of less than 1.0 adopted by the invention can be any existing granular profile control agent with the specific gravity of less than 1.0, and can also be preferably the granular profile control agent with the specific gravity of less than 1.0 prepared by the invention, and specifically comprises any one of soft rubber particles (specifically high-elasticity soft rubber particles), floating beads, hollow glass beads or coated rice hull powder.
It should be noted that the granular profile control agent with a specific gravity of less than 1.0 can be any one of soft rubber granules (specifically high-elasticity soft rubber granules), floating beads, hollow glass beads or coated rice hull powder, and is a single component.
The particle profile control agent with the specific gravity less than 1.0 plays a role in blocking a high-permeability stratum or a large pore channel through particle accumulation, deformation and bridging, so that water-drive bypassing flow plays a role in adjusting the profile and expanding water-drive wave and volume. The particle size is 0.05-0.5 mm.
Wherein the soft rubber particles are high-elasticity soft rubber particles, are styrene thermoplastic elastomers (containing SBS, SEBS, SIS or SEPS), have the particle size of 0.05-0.5 mm, the elongation of more than 500 percent and the specific gravity of less than 1.0, can float on the water surface and can be purchased in the market;
the laminating rice husk powder is prepared from rice husk powder serving as a body and petroleum asphalt serving as a laminating material, wherein the mass ratio of the petroleum asphalt to the rice husk is (0.1-0.5): 1, and processing the mixture by an internal mixer.
Wherein, the diameters of the floating beads and the hollow glass bead particles are 0.02-1.0 mm, the specific gravity is less than 1.0, and the hollow glass bead particles can be purchased in the market.
The floating bead is a fly ash hollow sphere which can float on the water surface, is grey white, has a thin and hollow wall, a closed and smooth surface and low thermal conductivity, and is an excellent heat-insulating refractory material. The floating beads mainly comprise silicon dioxide and aluminum oxide as chemical components, and have the characteristics of fine particles, hollowness, light weight, high strength, wear resistance, high temperature resistance, heat insulation, flame retardance and the like.
It should be noted that the Hollow glass microspheres (Hollow glass microspheres) mainly contain borosilicate, and have the characteristics of high compressive strength, high melting point, high resistivity, small thermal conductivity coefficient, small thermal shrinkage coefficient and the like.
The following describes a specific implementation process of the water injection well profile control process method with a packer string provided by the invention with reference to embodiment 1, embodiment 2 and embodiment 3.
Example 1:
selecting a certain water injection well of the large port oil field, wherein the distance h from the water injection well to a first packer below according to a profile control target layer is 50m, and profile control operation is implemented by profile control of rubber particles with specific gravity of 1.6.
Raw materials: rubber particles with the specific gravity of 1.6 and the diameter of 0.05-1.0 mm; clay (sodium bentonite); polyacrylamide (molecular mass is more than or equal to 1200 ten thousand, hydrolysis degree is 21%). Barite powder for drilling fluid. The above raw materials are all purchased from the market.
In example 1, the on-site formulation and construction steps were as follows:
step one, preparing weighted mud: the total volume of the weighted mud is 2+0.1 h-2 +0.1 50-7.0 (m3) And (5) designing. 350Kg of clay, 17Kg of polyacrylamide and 6000Kg of water are weighed and mixed for 45 min. Adding barite powder while stirring, continuously measuring the specific gravity of the mixed solution until the specific gravity is greater than 1.6, stopping adding barite, and continuously stirring for 10 min.
Step two, preparing a particle profile control system: rubber particles of 4 tons in profile control and 0.2 percent polyacrylamide aqueous solution of 80 tons are evenly mixed and stirred continuously.
And thirdly, evaluating the suspension property of the weighted mud. And (3) pouring 200mL of the weighted slurry prepared in the first step into a separating funnel, slowly pouring 40mL of the particle profile control system prepared in the second step into the separating funnel without stirring, standing for 2 days to observe that a small amount of rubber particles sink to the bottom of the container, separating the sinking rubber particles by using the separating funnel, cleaning, drying and weighing to be 0.11 g. The total rubber particles were isolated at 2.0 g. The particle suspension ratio was calculated to be (2.0-0.11)/2.0 to 94.5%.
Fourthly, from the periphery of an oil pipe in the water injection well (specifically an annular space between a packer and a profile control target layer), 3m is pressed3Per-hour displacement injection of 3.5m3The weighted mud formulated in the first step.
Fifthly, from the periphery of an oil pipe in the water injection well (specifically an annular space between a packer and a profile control target layer), 3m is measured3The/h displacement was injected into the entire particle profile control system prepared in the second step.
Sixthly, from the periphery of an oil pipe in the water injection well (specifically, an annular space between a packer and a profile control target layer), pressing 6m3H rowDose injection 3.5m3The weighted mud prepared in the first step of (1). Then water is injected normally. And finishing the construction. The problem that the packer is clamped by the particle profile control agent does not occur after construction.
Example 2:
and selecting a certain water injection well of the Hongkong oil field, wherein the distance h from the certain water injection well of the Hongkong oil field to the first packer below according to the profile control target layer is 80 m. The invention adopts the expanded particles with the specific gravity of 1.4 to carry out profile control operation.
Raw materials: the drilling mud is discarded, and the specific gravity is 1.5. The volume expansion particle profile control agent with the specific gravity of 1.4 is commercially available, and the particle diameter is 0.05-2.0 mm; polyacrylamide (molecular weight is more than or equal to 1200 ten thousand, hydrolysis degree is 21%), and the raw materials can be purchased in the market.
In example 2, the on-site preparation and construction steps were as follows:
first step, preparing weighted mud: since the used waste drilling mud has a specific gravity of 1.5 greater than the specific gravity of bulk-expanded particles of 1.4, the specific gravity of the waste drilling mud is not adjusted. Prepare the waste drilling mud 2+0.1 h-2 +0.1 80-10 (m)3)。
Step two, preparing a particle profile control system: 2 tons of the volume swelling particle profile control agent and 80 tons of 0.2 percent polyacrylamide aqueous solution are evenly mixed and stirred continuously.
And thirdly, evaluating the suspension property of the weighted mud. And (3) pouring 200mL of the sample of the waste drilling mud prepared in the first step into a separating funnel, slowly pouring 40mL of the sample of the particle profile control system prepared in the second step into the separating funnel without stirring, standing for 2 days, and observing that no particles sink to the bottom of the container, wherein the particle suspension rate is 100%.
Fourthly, from the periphery of an oil pipe in the water injection well (specifically an annular space between a packer and a profile control target layer), 3m is pressed3Per-hour displacement injection of 5.0m3The waste drilling mud prepared in the first step.
Fifthly, from the periphery of an oil pipe in the water injection well (specifically an annular space between a packer and a profile control target layer), 3m is measured3The/h displacement was injected into the complete particle profile control system prepared in the second step.
Sixth, from the periphery of the oil pipe in the water injection well (In particular the annulus between the packer and the layer of interest for profile control), in 6m3Per-hour displacement injection of 5.0m3The waste drilling mud prepared in the first step. Then water is injected normally. And finishing the construction. The problem of blocking the packer does not occur after construction.
Example 3:
and selecting a certain water injection well of the Hongkong oil field, wherein the distance h from the certain water injection well of the Hongkong oil field to the first packer below according to the profile control target layer is 180 m. The invention adopts the particle profile control agent with the specific gravity lower than 1 to carry out the profile control operation.
In particular, because h is larger than 100m, high-elastic soft rubber particles are adopted.
Raw materials: high-elasticity soft rubber particles: the styrene thermoplastic elastomer (containing SBS) has the specific gravity of 0.81 and the particle diameter of 1-5 mm, and is purchased in the market; polyacrylamide (molecular mass is more than or equal to 1200 ten thousand, hydrolysis degree is 21%).
The field preparation and construction steps are as follows:
step one, preparing a particle profile control system: 2 tons of high-elasticity soft rubber particles and 80 tons of polyacrylamide aqueous solution with the concentration of 0.2 percent are evenly mixed and stirred continuously.
And secondly, evaluating the suspension property of the weighted mud. And (3) pouring 200mL of tap water into a separating funnel, slowly pouring 40mL of a sample of the particle profile control system prepared in the first step into the separating funnel, standing for 2 days without stirring until no particles sink to the bottom of the container, and thus the particle suspension rate is 100%.
Thirdly, from the periphery of an oil pipe in the water injection well (specifically an annular space between a packer and a profile control target layer), according to the length of 3m3The/h displacement was injected into the entire particle profile control system formulated in the first step.
And step four, finally, injecting 0.15% polyacrylamide solution as a displacement slug. And finishing the construction. The problem of blocking the packer does not occur after construction.
Based on the technical scheme, compared with the prior art, the water injection well profile control process method with the packer pipe column provided by the invention has the following technical effects:
1. the invention introduces the waste drilling mud into the profile control process of the water injection well, and the mud is weighted in the oil sleeve annulus to prevent the particle profile control agent from depositing on the packer, thereby playing the role of protecting the packer from being blocked. The problem of the granule type profile control agent sinks and causes to block the packer is solved. The waste drilling mud is adopted, so that the effect of the invention can be realized, the waste can be utilized, and the environment is facilitated.
2. The particle profile control system prepared from the high-elasticity soft rubber or the coated rice hull powder has the particle suspension rate of 100 percent, so the particle profile control system cannot be deposited on the packer.
3. The construction process is simple, only the relevant agent profile control pump is needed to be injected into the stratum, and the tubular column in the well is not needed to be replaced.
Therefore, based on the above description, compared with the prior art, the water injection well profile control process method with the packer string provided by the invention can realize the profile control of the particle profile control agent on the water injection well with the packer string, effectively solves the problem that the packer string is clamped due to the sedimentation effect of the particle profile control agent, and has great production practice significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A profile control process method for a water injection well with a packer string is characterized by comprising the following steps:
firstly, measuring the distance h between a profile control target layer and a packer which is closest to the lower part in real time;
and secondly, comparing the distance h with a preset distance value interval, and correspondingly executing different profile control construction operations according to a comparison result.
2. The method according to claim 1, characterized in that in the second step, the preset interval of distance values is: a distance value interval of more than or equal to 10 meters to less than or equal to 100 meters.
3. The method according to claim 1, characterized in that in the second step, when the distance h is lower than the minimum value of the preset distance value interval, a first profile construction operation is performed.
The first profile control construction operation is as follows: the profile control agent is injected into the annulus between the packer and the target layer of profile control by using the profile control pump used in the profile control operation.
4. The method according to claim 1, characterized in that in the second step, when the distance h is within a preset distance value interval, a second profile construction operation is performed;
the second profile control construction operation specifically comprises the following steps:
A) gradually injecting weighted mud into an annular space between the packer and a profile control target layer, so that the weighted mud is deposited and covers the upper surface of the packer;
B) injecting a granular profile control agent slug with specific gravity greater than that of water;
C) and continuously injecting weighted slurry on the granular profile control agent to serve as a displacement slug to finish construction.
5. The method of claim 4, wherein in step A), the distance is 3m3The displacement of/h injects weighting mud.
In step C), specifically in terms of 6m3The displacement of/h injects weighting mud.
6. The method of claim 4, wherein the weighted slurry has a specific gravity of 1.5 to 2.0 and a viscosity of greater than 200 mPa-S in the second profile construction operation.
7. The method of claim 4, wherein in the second profile construction operation, the weighting mud is spent drilling mud;
and when the specific gravity of the waste drilling mud is lower than 1.5, adding barite powder into the waste drilling mud until the specific gravity of the waste drilling mud is between 1.5 and 2.0.
8. The method according to claim 4, characterized in that in the second profile control operation the weighting mud comprises water, bentonite, polyacrylamide and barite powder in a mass ratio of 100: 5: (0.1-0.5): (1-25).
9. The method according to claim 1, characterized in that in the second step, when the distance h is greater than the maximum value of the preset distance value interval, a third profile construction operation is performed;
the third profile control construction operation specifically comprises the following steps:
step A1) injecting a profile control system containing a particulate profile control agent having a specific gravity of less than 1.0 into an annulus located between a packer and a target profile control zone, such that the annulus located between the packer and the target profile control zone is filled with the profile control system containing the particulate profile control agent having a specific gravity of less than 1.0;
step B1) finally, polyacrylamide solution is injected to serve as a displacement slug, and meanwhile, the particle profile control agent with the specific gravity of less than 1.0 floats on the annular space and cannot be deposited to block the packer.
10. The method of claim 9, wherein the particulate profile control agent having a specific gravity of less than 1.0 comprises any one of soft gel particles, floating beads, hollow glass microspheres, or coated rice hull powder;
the profile control system comprises base liquid and particles with the specific gravity less than 1.0, and the mass part ratio of the base liquid to the particles is 100: (0-3), wherein the base fluid comprises any one of clay slurry, polyacrylamide solution and polyacrylamide gel.
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