CN114542007A - Method and device for plugging fluid channeling channel - Google Patents

Method and device for plugging fluid channeling channel Download PDF

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Publication number
CN114542007A
CN114542007A CN202011354074.7A CN202011354074A CN114542007A CN 114542007 A CN114542007 A CN 114542007A CN 202011354074 A CN202011354074 A CN 202011354074A CN 114542007 A CN114542007 A CN 114542007A
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polymer
flow channel
cross
plugging
channel
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CN114542007B (en
Inventor
张秋红
袁秋菊
王兴明
齐行涛
姚芳
刘贺
邹小萍
付高强
陈福明
曹作为
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/501—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls using spacer compositions
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
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  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

The application provides a method and a device for plugging a channeling channel, and belongs to the technical field of profile control and water plugging of oil fields. The method comprises the following steps: determining the concentration of the flooding polymer in a target production fluid, wherein the target production fluid is the production fluid of an oil well obtained after the flooding polymer is injected into a polymer injection well; if the concentration reaches the reference concentration, determining that a cross-flow channel between the oil well and the polymer injection well meets a plugging condition; under the condition that the channeling channel meets the blocking condition, injecting spacer fluid into the channeling channel; continuing to inject inorganic particle curing plugging agent into the cross-flow channel, wherein the spacer fluid is used for separating the flooding polymer and the inorganic particle curing plugging agent in the cross-flow channel; and injecting the spacer fluid into the cross flow channel again. The method can improve the blocking effect of the channeling channel.

Description

Method and device for plugging fluid channeling channel
Technical Field
The application relates to the technical field of profile control and water shutoff of oil fields, in particular to a method and a device for plugging a channeling channel.
Background
At present, polymer flooding becomes one of important means for improving the crude oil recovery ratio of high-water-content old oil fields in China. Because of the influence of stratum heterogeneity, the oil field of polymer flooding is developed, the phenomenon that flooding polymers generate cross flow along a cross flow channel and then generate too early in the oil well is very easy to occur, so that not only is the flooding efficiency of the flooding polymers influenced, but also the great waste of the flooding polymers is caused, the treatment difficulty of output liquid is increased, and therefore the cross flow channel needs to be blocked.
In the related art, the channeling channel is generally blocked by adopting the cationic polymer and the organic jelly, however, when the channeling condition of the channeling channel is serious, the blocking effect of the mode is poor because the cationic polymer and the organic jelly have high fluidity and low strength.
Disclosure of Invention
The embodiment of the application provides a method and a device for blocking a channeling channel, which can improve the blocking effect of the channeling channel. The technical scheme is as follows:
in one aspect, a method for blocking a cross-flow channel is provided, which includes:
determining the concentration of the flooding polymer in a target production fluid, wherein the target production fluid is the production fluid of an oil well obtained after the flooding polymer is injected into a polymer injection well;
if the concentration reaches the reference concentration, determining that a cross-flow channel between the oil well and the polymer injection well meets a plugging condition;
under the condition that the channeling channel meets the blocking condition, injecting spacer fluid into the channeling channel;
continuing to inject inorganic particle curing plugging agent into the cross-flow channel, wherein the spacer fluid is used for separating the flooding polymer and the inorganic particle curing plugging agent in the cross-flow channel;
and injecting the spacer fluid into the cross-flow channel again.
In one possible implementation, before injecting the spacer fluid into the cross-flow channel, the method further includes:
dissolving a plant polymer in water to prepare the isolating solution with the viscosity of 60-120 mPa.s.
In another possible implementation, the plant polymer includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation, before continuing to inject the inorganic particle solidifying plugging agent into the cross-flow channel, the method further comprises:
dissolving the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
In another possible implementation, the inorganic particles include at least one of cement, clay, or fly ash.
In another possible implementation manner, the injecting a spacer fluid into the cross flow channel includes:
injecting the spacer fluid in at least one of the oil well or the polymer injection well.
In another aspect, there is provided a cross-flow passage blocking device, the device comprising:
the concentration determination module is configured to determine the concentration of the flooding polymer in a target production fluid, wherein the target production fluid is the production fluid of an oil well obtained after the flooding polymer is injected into a polymer injection well;
a plugging condition determination module configured to determine that a cross-flow channel between the oil well and the polymer injection well satisfies a plugging condition if the concentration reaches a reference concentration;
a spacer injection module configured to inject a spacer in the blow-by channel if the blow-by channel satisfies the blocking condition;
a curing and plugging agent injection module configured to continue injecting inorganic particle curing and plugging agent into the cross-flow channel, wherein the spacer fluid is used for separating the flooding polymer in the cross-flow channel from the inorganic particle curing and plugging agent;
the spacer injection module is further configured to inject spacer again in the cross-flow channel.
In one possible implementation, the apparatus further includes:
the isolation liquid preparation module is used for dissolving the plant polymer in water to prepare the isolation liquid with the viscosity of 60-120 mPa.s.
In another possible implementation, the plant polymer includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation manner, the apparatus further includes:
and the solidifying and plugging agent configuring module is configured to dissolve the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
In another possible implementation, the inorganic particles include at least one of cement, clay, or fly ash.
In another possible implementation, the spacer fluid injection module is configured to inject the spacer fluid in at least one of the oil well or the polymer injection well.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
according to the technical scheme provided by the embodiment of the application, if the concentration of the flooding polymer in the produced liquid of the oil well reaches the reference concentration after the flooding polymer is injected into the polymer injection well, the channeling channel between the oil well and the polymer injection well is well developed and needs to be plugged. The inorganic particle solidifying and blocking agent can realize the filling and the integral cementing type blocking of pore space, and has high strength after being solidified, so that the channeling channel is blocked by the inorganic particle solidifying and blocking agent, and the blocking effect is improved. And when the channeling passage is blocked by the inorganic particle solidifying and blocking agent, considering that the flocculation effect of the oil displacing polymer is good, and the oil displacing polymer and the inorganic particle solidifying and blocking agent can form a large particle flocculating body, so that the solidifying and blocking agent of the inorganic particle loses the solidifying ability and the blocking effect is influenced, therefore, the spacer fluid is injected before the inorganic particle solidifying and blocking agent is injected into the channeling passage, so as to separate the inorganic particle solidifying and blocking agent which is injected next from the existing oil displacing polymer in the channeling passage, and the spacer fluid is continuously injected after the inorganic particle solidifying and blocking agent is injected, so as to prevent the oil displacing polymer which is injected in the subsequent oil displacing process from flocculating with the inorganic particle solidifying and blocking agent in the channeling passage, thereby ensuring the blocking effect of the channeling passage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for blocking a cross-flow passage provided by an embodiment of the present application;
FIG. 2 is a flow chart of a method for blocking a cross-flow channel according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a cross-flow passage blocking device according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The terms "first," "second," "third," "fourth," and the like as used herein may be used herein to describe various concepts, but these concepts are not limited by these terms unless otherwise specified. These terms are only used to distinguish one concept from another. For example, a first well may be referred to as a well, and similarly, a second well may be referred to as a first well, without departing from the scope of the present application.
As used herein, the terms "at least one," "a plurality," "each," and "any," at least one of which includes one, two, or more than two, and a plurality of which includes two or more than two, each of which refers to each of the corresponding plurality, and any of which refers to any of the plurality. For example, the plurality of cross-flow channels include 3 cross-flow channels, each of which refers to each of the 3 cross-flow channels, and any one of the 3 cross-flow channels may be the first one, the second one, or the third one.
Fig. 1 is a flowchart of a method for blocking a cross-flow channel according to an embodiment of the present disclosure. The execution main body is a channeling flow channel plugging device. Referring to fig. 1, the embodiment includes:
101: and determining the concentration of the oil displacing polymer in the target production liquid, wherein the target production liquid is the production liquid of the oil well obtained after the oil displacing polymer is injected into the polymer injection well.
102: and if the concentration reaches the reference concentration, determining that a channeling channel between the oil well and the polymer injection well meets the plugging condition.
103: and under the condition that the channeling channel meets the plugging condition, injecting spacer fluid into the channeling channel.
104: and continuously injecting the inorganic particle curing and plugging agent into the channeling passage, wherein the spacer fluid is used for separating the oil displacing polymer and the inorganic particle curing and plugging agent in the channeling passage.
105: and injecting the spacer fluid into the cross flow channel again.
According to the technical scheme provided by the embodiment of the application, if the concentration of the flooding polymer in the produced liquid of the oil well reaches the reference concentration after the flooding polymer is injected into the polymer injection well, the channeling channel between the oil well and the polymer injection well is well developed and needs to be plugged. The inorganic particle solidifying and blocking agent can realize the filling and the integral cementing type blocking of pore space, and has high strength after being solidified, so that the channeling channel is blocked by the inorganic particle solidifying and blocking agent, and the blocking effect is improved. And when the channeling passage is blocked by the inorganic particle solidifying and blocking agent, considering that the flocculation effect of the oil displacing polymer is good, and the oil displacing polymer and the inorganic particle solidifying and blocking agent can form a large particle flocculating body, so that the solidifying and blocking agent of the inorganic particle loses the solidifying ability and the blocking effect is influenced, therefore, the spacer fluid is injected before the inorganic particle solidifying and blocking agent is injected into the channeling passage, so as to separate the inorganic particle solidifying and blocking agent which is injected next from the existing oil displacing polymer in the channeling passage, and the spacer fluid is continuously injected after the inorganic particle solidifying and blocking agent is injected, so as to prevent the oil displacing polymer which is injected in the subsequent oil displacing process from flocculating with the inorganic particle solidifying and blocking agent in the channeling passage, thereby ensuring the blocking effect of the channeling passage.
In one possible implementation, before injecting the spacer fluid into the cross-flow channel, the method further comprises:
dissolving the plant polymer in water to prepare the spacer fluid with the viscosity of 60-120 mPa.s.
In another possible implementation, the vegetable polymer includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation, before continuing to inject the inorganic particle-curing plugging agent into the cross-flow channel, the method further comprises:
dissolving the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
In another possible implementation, the inorganic particles include at least one of cement, clay, or fly ash.
In another possible implementation, injecting a spacer fluid into the cross-flow channel includes:
injecting a spacer fluid into at least one of the oil well or the polymer injection well.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
It should be noted that polymer flooding has become one of the important means for improving the crude oil recovery of the high-water-content old oil field in China at present. Polymer flooding is an effective method for increasing recovery efficiency, and mainly depends on increasing the viscosity of a water phase, reducing the permeability of the water phase and further reducing the fluidity ratio of the water phase and an oil phase, thereby enlarging the swept volume. On a microcosmic level, the oil displacement polymer generates a stretching effect on an oil film or oil drops in the flowing process due to the inherent viscoelasticity of the oil displacement polymer, so that the carrying capacity is increased, and the microcosmic oil washing efficiency is improved. However, when the cross flow channel between the oil well and the polymer injection well is well developed, the flooding polymer flows into the oil well along the cross flow channel, so that the flooding polymer is produced prematurely in the oil well, the flooding efficiency of the flooding polymer is affected, the flooding polymer is wasted, the treatment difficulty of produced liquid is increased, and the cross flow channel needs to be blocked.
Under the condition that the development of a channeling channel between the oil well and the polymer injection well is verified to be good, namely the channeling channel is developed to be completely communicated with the large channel, the residual oil in the channeling channel is basically completely displaced. Because the inorganic particle curing plugging agent can realize the filling and the integral cementing type plugging of pore spaces in the channeling channel, the cured inorganic particle curing plugging agent has very high strength, can prevent the oil displacing polymer from continuously channeling, and achieves the purpose of plugging channeling. Therefore, under the condition that the residual oil in the channeling channel is basically completely displaced, the inorganic particle solidifying and plugging agent can be directly adopted to plug the channeling channel so as to prevent the follow-up oil displacing polymer from continuously and inefficiently circulating along the large pore channel.
In the polymer injection development block, the adopted oil displacement polymer is anionic polyacrylamide, and has long molecular chains and large-order-of-magnitude long chains with huge adsorption surface area in water, so that the flocculation effect is good, and the oil displacement polymer and the inorganic particle curing and plugging agent can form large-particle floccules to enable the inorganic particle curing and plugging agent to lose the curing capability and further lose the plugging capability. Therefore, the application proposes a new method for blocking the channeling channel by using the spacer fluid and the inorganic particle solidified blocking agent, and the specific process is as follows.
Fig. 2 is a flowchart of a method for blocking a cross-flow channel according to an embodiment of the present disclosure. Referring to fig. 2, the embodiment includes:
201: and determining the concentration of the flooding polymer in the target output liquid by the channeling channel plugging device, wherein the target output liquid is the output liquid of the oil well obtained after the flooding polymer is injected into the polymer injection well.
The polymer injection well is used for injecting a flooding polymer, the flooding polymer is injected into the polymer injection well, the flooding polymer can enter a stratum, and crude oil in the stratum is displaced under certain injection pressure, so that the crude oil is extracted from an oil well. However, due to the long-term scouring action of the flooding polymer, a communicated pore channel, namely a channeling channel, is formed between the polymer injection well and the oil well, and the flooding polymer injected from the polymer injection well directly flows into the oil well through the channeling channel, so that the flooding effect is lost.
Before plugging a channeling channel between an oil well and a polymer injection well, the development condition of the channeling channel is determined, and the channeling channel is plugged under the condition that the development condition of the channeling channel is good. In the embodiment of the application, the development condition of the cross-flow channel is determined by injecting the flooding polymer into the polymer injection well and then determining the concentration of the flooding polymer in the production fluid of the oil well.
It should be noted that the present application is not limited to what flooding polymer is used, and optionally, the flooding polymer is a polyacrylamide solution.
202: and if the concentration reaches the reference concentration, the channeling channel plugging device determines that the channeling channel between the oil well and the polymer injection well meets the plugging condition.
If the development condition of the channeling channel is good, the oil displacing polymer can directly flow into the oil well from the polymer injection well along the channeling channel in a channeling mode, and the concentration of the oil displacing polymer in the produced liquid is large. Therefore, when the concentration of the oil displacement polymer in the produced liquid reaches the reference concentration, the development condition of the channeling channel is better, and the plugging condition is met.
Alternatively, the reference concentration is set to any value according to actual conditions, for example, to 1010mg/L, which is not limited in the embodiments of the present application.
203: the channeling channel plugging device dissolves the plant polymer in water to prepare the spacer fluid with the viscosity of 60-120 mPa.s.
The spacer fluid is used for separating the flooding polymer from the inorganic particle curing plugging agent for plugging the channeling channel, and prevents the flooding polymer and the inorganic particle curing plugging agent from flocculation reaction to influence the curing of the inorganic particle curing plugging agent, thereby avoiding the waste of the inorganic particle curing plugging agent. And the spacer fluid has certain viscosity and can play a role in filling pore spaces in the channeling channel.
Optionally, the vegetable polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar or guar. Of course, other vegetable polymers can be selected, and the examples are not limited thereto.
Optionally, the channeling channel blocking device dissolves the plant polymer in water, and the isolating liquid with the viscosity of 60-120 mpa.s is prepared by the following implementation mode: the channeling channel plugging device adds 0.6-1.2 parts of plant polymer into 100 parts of water, and disperses and dissolves the plant polymer for a first reference time length to obtain the spacer fluid with the viscosity of 60-120 mPa.s. Optionally, the first reference time period is any time period within 5-10 minutes. Wherein the mass of one part of water is the same as the mass of one part of the plant polymer.
It should be noted that 203 can be executed before 201 or after 202, between 201 and 202, or simultaneously with 201 or 202, which is not limited in this embodiment of the application.
204: the channeling flow channel blocking device injects spacer fluid into the channeling flow channel under the condition that the channeling flow channel meets the blocking condition.
The channeling flow channel blocking device injects configured spacer fluid into the channeling flow channel under the condition that the channeling flow channel meets the blocking condition so as to separate the oil displacing polymer in the channeling flow channel from the inorganic particle solidifying and blocking agent injected later.
Optionally, the implementation manner of injecting the spacer fluid into the channeling channel by the channeling channel blocking device is as follows: the cross-flow channel blocking device injects a spacer fluid into at least one of the oil well or the polymer injection well to allow the spacer fluid to enter the cross-flow channel. Wherein, inject into the spacer fluid respectively from the oil well and annotate in gathering the well, can guarantee that the channeling flow passageway surface evenly covers the spacer fluid, promote the isolation effect.
The embodiment of the application does not limit the amount of the injected spacer fluid. Optionally, the amount of the injected spacer fluid is 5-30 m3。
205: the plant polymer and the inorganic particles are dissolved in water by the cross flow channel plugging device to obtain the inorganic particle solidified plugging agent.
Because the inorganic particle solidifying and blocking agent is consistent with the spacer fluid and is also prepared from the plant polymer, the compatibility of the inorganic particle solidifying and blocking agent and the spacer fluid is good, the inorganic particle solidifying and blocking agent and the spacer fluid can not react, and the solidification of the inorganic particle solidifying and blocking agent can not be influenced.
Optionally, the plant polymer and the inorganic particles are dissolved in water by the cross-flow channel blocking device to obtain the inorganic particle solidified blocking agent by the following implementation mode: and adding 0.1-0.5 part of plant polymer into 100 parts of water by the channeling channel plugging device, dispersing and dissolving for a second reference time, adding 120-180 parts of inorganic particles, and dispersing and dissolving for a third reference time to obtain the inorganic particle curing plugging agent. Optionally, the first reference time period is any time period within 5-10 minutes. Optionally, the second reference time period is any time period within 10-20 minutes. Wherein the mass of one part of water is the same as the mass of one part of vegetable polymer and the same as the mass of one part of inorganic particles.
Optionally, the inorganic particles comprise at least one of cement, clay, or fly ash. Of course, other inorganic particles can be selected, and the examples of the present application do not limit the present invention.
It should be noted that, in the embodiments of the present application, no requirement is made on the order between 205 and 201 to 204.
206: and the channeling channel blocking device continues to inject inorganic particle curing blocking agent into the channeling channel.
Because the spacer fluid is injected into the channeling flow channel, the inorganic particle solidifying and plugging agent is injected at the moment, and the inorganic particle solidifying and plugging agent cannot be contacted with the oil displacing polymer in the channeling flow channel, so that no reaction occurs. In addition, the inorganic particle solidified plugging agent has high strength, so that the channeling channel can be effectively plugged, and the plugging quality is good.
Optionally, the implementation manner of injecting the inorganic particle curing blocking agent into the cross flow channel by the cross flow channel blocking device is as follows: the channeling channel blocking device injects inorganic particle solidified blocking agent into at least one of the oil well or the polymer injection well, so that the inorganic particle solidified blocking agent enters the channeling channel. Wherein, the inorganic particle solidified plugging agent is respectively injected into the oil well and the polymer injection well, so that the plugging efficiency of the channeling channel can be improved, and the plugging quality of the channeling channel can be improved.
In the examples of the present application, the amount of the inorganic particle-curing plugging agent injected is not required. Optionally, the amount of the injected inorganic particle curing plugging agent is 5-40 m3。
207: and injecting the spacer fluid into the channeling channel again by the channeling channel plugging device.
In the embodiment of the application, after the channeling passage is plugged, the flooding polymer is required to be injected into the polymer injection well for flooding, in order to avoid the reaction between the flooding polymer and the inorganic particle curing plugging agent injected into the channeling passage, after the inorganic particle curing plugging agent is injected into the channeling passage, the spacer fluid is required to be injected into the channeling passage again, so that the inorganic particle curing plugging agent is thoroughly separated from the flooding polymer, the curing effect of the inorganic particle curing plugging agent is ensured, and the plugging quality of the channeling passage is ensured.
It should be noted that after the spacer fluid is injected, the well needs to be shut in and the inorganic particle solidifying plugging agent needs to be solidified. Optionally, the waiting time for the solidification of the curing plugging agent is set according to actual conditions, for example, the waiting time is 48-72 hours.
The blocking scheme of the blow-by channel is explained below by means of several specific examples.
The plugging protocol of example 1 is as follows:
(1) the concentration of the flooding polymer in the produced liquid of the oil well is 1010mg/L, and the flow channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing an isolation liquid: and adding 1.2 parts of carboxymethyl cellulose into 100 parts of water, and dispersing and dissolving for 10 minutes to prepare the isolation solution with the viscosity of 80-100 mPa.s.
(3) Preparing inorganic particle curing plugging agent: and (3) adding 0.5 part of carboxymethyl cellulose into 100 parts of water, dispersing and dissolving for 10 minutes, then adding 100 parts of cement and 20 parts of clay, dispersing and dissolving for 20 minutes, and preparing the inorganic particle solidifying and plugging agent.
(4) Carrying out plugging construction: firstly, 5m of spacer fluid is injected into the channeling channel3Then, inorganic particle solidifying and blocking agent is injected into the cross flow channel for 40m3Finally, 5m of spacer fluid is injected into the cross flow channel3。
(5) The well is shut in for solidification for 72 h.
The plugging protocol of example 2 is as follows:
(1) the concentration of the flooding polymer in the produced liquid of the oil well is 1216mg/L, and the flow channeling passage between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing an isolation liquid: and adding 0.8 part of hydroxyethyl cellulose into 100 parts of water, and dispersing and dissolving for 10 minutes to prepare the spacer fluid with the viscosity of 100-120 mPa.s.
(3) Preparing inorganic particle curing plugging agent: and adding 0.1 part of hydroxyethyl cellulose into 100 parts of water, dispersing and dissolving for 5 minutes, adding 160 parts of cement and 20 parts of fly ash, dispersing and dissolving for 20 minutes, and preparing the inorganic particle curing plugging agent.
(4) Carrying out plugging construction: firstly, the spacer fluid is injected into the channeling channel for 15m3Then, 13m of inorganic particle curing plugging agent is injected into the cross flow channel3Finally, 5m of spacer fluid is injected into the cross flow channel3。
(5) The well is shut in for solidification for 48 h.
The plugging protocol of example 3 is as follows:
(1) the concentration of the flooding polymer in the produced liquid of the oil well is 1058mg/L, and the flow channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing an isolation liquid: and adding 1.0 part of guanidine gum into 100 parts of water, dispersing and dissolving for 10 minutes, and preparing the isolating solution with the viscosity of 80-100 mPa.s.
(3) Preparing inorganic particle curing plugging agent: and adding 0.2 part of guanidine gum into 100 parts of water, dispersing and dissolving for 5 minutes, adding 120 parts of cement, 20 parts of fly ash and 20 parts of clay, dispersing and dissolving for 20 minutes, and preparing the inorganic particle curing plugging agent.
(4) Carrying out plugging construction: firstly, the spacer fluid is injected into the cross-flow channel for 20m3Then injecting inorganic particle solidifying plugging agent 6m into the cross flow channel3Finally, 10m of spacer fluid is injected into the cross flow channel3。
(5) The well is shut in for solidification for 48 h.
The plugging protocol of example 4 is as follows:
(1) the concentration of the flooding polymer in the produced liquid of the oil well is 1120mg/L, and the flow channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing an isolation liquid: and adding 0.6 part of hydroxypropyl guar gum into 100 parts of water, dispersing and dissolving for 10 minutes, and preparing the isolation solution with the viscosity of 80-100 mPa.s.
(3) Preparing inorganic particle curing plugging agent: and adding 0.3 part of hydroxypropyl guar gum into 100 parts of water, dispersing and dissolving for 10 minutes, adding 120 parts of cement and 20 parts of clay, dispersing and dissolving for 20 minutes, and preparing the inorganic particle solidifying and plugging agent.
(4) Carrying out plugging construction: firstly, 30m of spacer fluid is injected into the channeling channel3Then injecting inorganic particle curing plugging agent 9m into the cross flow channel3Finally, 5m of spacer fluid is injected into the cross flow channel3。
(5) The well is shut in for solidification for 72 h.
The specific application of the channeling channel plugging method is as follows:
(1) the water content of a certain polymer injection well is 100 percent corresponding to the oil well, and the concentration of the oil-displacing polymer in the produced liquid is up to 1216mg/L, which indicates that the cross flow channel between the oil well and the polymer injection well is well developed. The following plugging process is adopted:firstly, the spacer fluid is injected into the channeling channel for 15m3Then, 13m of inorganic particle curing plugging agent is injected into the cross flow channel3Finally, 5m of spacer fluid is injected into the cross flow channel3. Then the polymer injection well recovers normal polymer injection, and the accumulated injected oil displacement polymer is 5.1 multiplied by 104m3And the phenomenon of channeling and gathering does not occur in the corresponding oil well.
(2) And in the process of polymer injection, the concentration of the oil displacement polymer in the produced liquid of the corresponding oil well rises quickly from 501mg/L to 1010mg/L, and accordingly, the development of a cross flow channel between the oil well and the polymer injection well is judged to meet the plugging condition. The following plugging process is adopted: firstly, 5m of spacer fluid is injected into the channeling channel3Then, inorganic particle solidifying and blocking agent is injected into the cross flow channel for 40m3Finally, 5m of spacer fluid is injected into the cross flow channel3. And then the oil well recovers normal production, and the yield of crude oil is increased by 406 tons cumulatively.
According to the technical scheme provided by the embodiment of the application, if the concentration of the flooding polymer in the produced liquid of the oil well reaches the reference concentration after the flooding polymer is injected into the polymer injection well, the channeling channel between the oil well and the polymer injection well is well developed and needs to be plugged. The inorganic particle solidifying and blocking agent can realize the filling and the integral cementing type blocking of pore space, and has high strength after being solidified, so that the channeling channel is blocked by the inorganic particle solidifying and blocking agent, and the blocking effect is improved. And when the channeling passage is blocked by the inorganic particle solidifying and blocking agent, considering that the flocculation effect of the oil displacing polymer is good, and the oil displacing polymer and the inorganic particle solidifying and blocking agent can form a large particle flocculating body, so that the solidifying and blocking agent of the inorganic particle loses the solidifying ability and the blocking effect is influenced, therefore, the spacer fluid is injected before the inorganic particle solidifying and blocking agent is injected into the channeling passage, so as to separate the inorganic particle solidifying and blocking agent which is injected next from the existing oil displacing polymer in the channeling passage, and the spacer fluid is continuously injected after the inorganic particle solidifying and blocking agent is injected, so as to prevent the oil displacing polymer which is injected in the subsequent oil displacing process from flocculating with the inorganic particle solidifying and blocking agent in the channeling passage, thereby ensuring the blocking effect of the channeling passage.
Fig. 3 is a block diagram of a cross-flow passage blocking device according to an embodiment of the present disclosure. Referring to fig. 3, the apparatus includes:
a concentration determination module 301 configured to determine the concentration of the flooding polymer in a target production fluid, where the target production fluid is an oil well production fluid obtained after the flooding polymer is injected into the polymer injection well;
a plugging condition determining module 302 configured to determine that a cross-flow channel between the oil well and the polymer injection well satisfies a plugging condition if the concentration reaches a reference concentration;
a spacer injection module 303 configured to inject a spacer into the cross-flow channel if the cross-flow channel satisfies a blocking condition;
a curing and plugging agent injection module 304 configured to continue injecting inorganic particle curing and plugging agent into the cross-flow channel, the spacer fluid being used to separate the flooding polymer from the inorganic particle curing and plugging agent in the cross-flow channel;
the spacer injection module 303 is further configured to inject the spacer again in the cross-flow channel.
In one possible implementation, the apparatus further includes:
the isolation liquid preparation module is used for dissolving the plant polymer in water to prepare the isolation liquid with the viscosity of 60-120 mPa.s.
In another possible implementation, the vegetable polymer includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation manner, the apparatus further includes:
and the solidifying and plugging agent configuration module is configured to dissolve the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
In another possible implementation, the inorganic particles include at least one of cement, clay, or fly ash.
In another possible implementation, the spacer fluid injection module 303 is configured to inject a spacer fluid in at least one of the oil well or the polymer injection well.
According to the technical scheme provided by the embodiment of the application, if the concentration of the flooding polymer in the produced liquid of the oil well reaches the reference concentration after the flooding polymer is injected into the polymer injection well, the channeling channel between the oil well and the polymer injection well is well developed and needs to be plugged. The inorganic particle solidifying and blocking agent can realize the filling and the integral cementing type blocking of pore space, and has high strength after being solidified, so that the channeling channel is blocked by the inorganic particle solidifying and blocking agent, and the blocking effect is improved. And when the channeling passage is blocked by the inorganic particle solidifying and blocking agent, considering that the flocculation effect of the oil displacing polymer is good, and the oil displacing polymer and the inorganic particle solidifying and blocking agent can form a large particle flocculating body, so that the solidifying and blocking agent of the inorganic particle loses the solidifying ability and the blocking effect is influenced, therefore, the spacer fluid is injected before the inorganic particle solidifying and blocking agent is injected into the channeling passage, so as to separate the inorganic particle solidifying and blocking agent which is injected next from the existing oil displacing polymer in the channeling passage, and the spacer fluid is continuously injected after the inorganic particle solidifying and blocking agent is injected, so as to prevent the oil displacing polymer which is injected in the subsequent oil displacing process from flocculating with the inorganic particle solidifying and blocking agent in the channeling passage, thereby ensuring the blocking effect of the channeling passage.
It should be noted that: when the cross flow channel blocking device provided in the above embodiment blocks a cross flow channel, only the division of the above functional modules is used for illustration, and in practical application, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the cross flow channel blocking device is divided into different functional modules, so as to complete all or part of the above described functions. In addition, the embodiment of the flow channel blocking device and the embodiment of the flow channel blocking method provided by the above embodiments belong to the same concept, and the specific implementation process is detailed in the method embodiments and is not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A method of plugging a flow channel, the method comprising:
determining the concentration of the flooding polymer in a target production fluid, wherein the target production fluid is the production fluid of an oil well obtained after the flooding polymer is injected into a polymer injection well;
if the concentration reaches the reference concentration, determining that a cross-flow channel between the oil well and the polymer injection well meets a plugging condition;
under the condition that the channeling channel meets the blocking condition, injecting spacer fluid into the channeling channel;
continuing to inject inorganic particle curing plugging agent into the cross-flow channel, wherein the spacer fluid is used for separating the flooding polymer and the inorganic particle curing plugging agent in the cross-flow channel;
and injecting the spacer fluid into the cross flow channel again.
2. The method of claim 1, wherein prior to injecting spacer fluid in the blow-by channel, the method further comprises:
dissolving a plant polymer in water to prepare the isolating solution with the viscosity of 60-120 mPa.s.
3. The method of claim 2, wherein the plant polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar or guar.
4. The method of claim 1, wherein prior to continuing to inject inorganic particulate curing plugging agent in the cross-flow channel, the method further comprises:
dissolving the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
5. The method of claim 4, wherein the inorganic particles comprise at least one of cement, clay, or fly ash.
6. The method of claim 1, wherein said injecting a spacer fluid in said cross-flow channel comprises:
injecting the spacer fluid in at least one of the oil well or the polymer injection well.
7. A cross-flow channel blocking device, the device comprising:
the concentration determination module is configured to determine the concentration of the flooding polymer in a target production fluid, wherein the target production fluid is the production fluid of an oil well obtained after the flooding polymer is injected into a polymer injection well;
a plugging condition determination module configured to determine that a cross-flow channel between the oil well and the polymer injection well satisfies a plugging condition if the concentration reaches a reference concentration;
a spacer injection module configured to inject a spacer in the blow-by channel if the blow-by channel satisfies the blocking condition;
a curing and plugging agent injection module configured to continue injecting inorganic particle curing and plugging agent into the cross-flow channel, wherein the spacer fluid is used for separating the flooding polymer in the cross-flow channel from the inorganic particle curing and plugging agent;
the spacer injection module is further configured to inject spacer again in the cross-flow channel.
8. The apparatus of claim 7, further comprising:
the isolation liquid preparation module is used for dissolving the plant polymer in water to prepare the isolation liquid with the viscosity of 60-120 mPa.s.
9. The device of claim 8, wherein the plant polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar or guar.
10. The apparatus of claim 7, further comprising:
and the solidifying and plugging agent configuring module is configured to dissolve the plant polymer and the inorganic particles in water to obtain the inorganic particle solidifying and plugging agent.
CN202011354074.7A 2020-11-26 2020-11-26 Method and device for plugging cross flow channel Active CN114542007B (en)

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