CN114542007B - Method and device for plugging cross flow channel - Google Patents
Method and device for plugging cross flow channel Download PDFInfo
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- CN114542007B CN114542007B CN202011354074.7A CN202011354074A CN114542007B CN 114542007 B CN114542007 B CN 114542007B CN 202011354074 A CN202011354074 A CN 202011354074A CN 114542007 B CN114542007 B CN 114542007B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 229920000642 polymer Polymers 0.000 claims abstract description 161
- 239000010954 inorganic particle Substances 0.000 claims abstract description 129
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 118
- 239000012530 fluid Substances 0.000 claims abstract description 87
- 238000002347 injection Methods 0.000 claims abstract description 72
- 239000007924 injection Substances 0.000 claims abstract description 72
- 238000006073 displacement reaction Methods 0.000 claims abstract description 63
- 230000005465 channeling Effects 0.000 claims abstract description 60
- 125000006850 spacer group Chemical group 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 239000003129 oil well Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000002955 isolation Methods 0.000 claims description 20
- 239000004568 cement Substances 0.000 claims description 10
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 9
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 9
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 9
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 9
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 9
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 9
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 8
- JDXXTKLHHZMVIO-UHFFFAOYSA-N 2-(3-hydroxypropyl)guanidine Chemical compound NC(=N)NCCCO JDXXTKLHHZMVIO-UHFFFAOYSA-N 0.000 claims description 4
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 23
- 239000003921 oil Substances 0.000 description 63
- 241000196324 Embryophyta Species 0.000 description 15
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 10
- 239000011148 porous material Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 235000013311 vegetables Nutrition 0.000 description 8
- 238000005189 flocculation Methods 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 5
- -1 hydroxypropyl Chemical group 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000003311 flocculating effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920006317 cationic polymer Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application provides a channeling channel plugging method and device, and belongs to the technical field of profile control and water plugging in oil fields. The method comprises the following steps: determining the concentration of an oil displacement polymer in a target produced fluid, wherein the target produced fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into an 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 plugging condition, injecting isolating liquid into the channeling channel; continuously injecting an inorganic particle curing plugging agent into the channeling channel, wherein the spacer fluid is used for isolating the oil displacement polymer in the channeling channel from the inorganic particle curing plugging agent; and injecting the isolating liquid into the cross flow channel again. The method can improve the plugging effect of the channeling channel.
Description
Technical Field
The application relates to the technical field of profile control and water shutoff in oil fields, in particular to a method and a device for plugging a cross-flow channel.
Background
At present, polymer flooding has become one of important means for improving crude oil recovery efficiency in high-water-content old oil fields in China. Because the oil field driven by the polymer is developed under the influence of the heterogeneity of the stratum, the phenomenon that the oil displacement polymer flows along the channeling channel and is produced in the oil well too early is extremely easy to occur, the oil displacement efficiency of the oil displacement polymer is affected, the oil displacement polymer is greatly wasted, and the treatment difficulty of the produced liquid is increased, so that the channeling channel is required to be plugged.
In the related art, a cationic polymer and an organic gel are generally adopted to plug a crossflow channel, however, when the crossflow condition of the crossflow channel is serious, the blocking effect of the mode is poor because the cationic polymer and the organic gel have high fluidity and low strength.
Disclosure of Invention
The embodiment of the application provides a method and a device for plugging a cross flow channel, which can improve the plugging effect of the cross flow channel. The technical scheme is as follows:
in one aspect, a method for plugging a cross-flow channel is provided, the method comprising:
determining the concentration of an oil displacement polymer in a target produced fluid, wherein the target produced fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into an 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 plugging condition, injecting isolating liquid into the channeling channel;
continuously injecting an inorganic particle curing plugging agent into the channeling channel, wherein the spacer fluid is used for isolating the oil displacement polymer in the channeling channel from the inorganic particle curing plugging agent;
and injecting the isolating liquid into the cross flow channel again.
In one possible implementation, before the injecting the spacer fluid into the channeling channel, the method further includes:
the plant polymer is dissolved 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 the continuing to inject the inorganic particle solidifying plugging agent into the channeling channel, the method further includes:
and dissolving the plant polymer and the inorganic particles in water to obtain the inorganic particle curing 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 the spacer fluid into the channeling channel includes:
injecting the spacer fluid into at least one of the well or the injection well.
In another aspect, a cross-flow channel plugging device is provided, the device comprising:
the concentration determining module is configured to determine the concentration of the oil displacement polymer in a target production fluid, wherein the target production fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into the polymer injection well;
the plugging condition determining module is configured to determine that a cross flow channel between the oil well and the polymer injection well meets plugging conditions if the concentration reaches a reference concentration;
the isolation liquid injection module is configured to inject isolation liquid into the cross flow channel under the condition that the cross flow channel meets the blocking condition;
a curing plugging agent injection module configured to continue injecting an inorganic particle curing plugging agent in the fluid-channeling channel, the spacer fluid being used to isolate the oil-displacing polymer in the fluid-channeling channel from the inorganic particle curing plugging agent;
the spacer fluid injection module is further configured to inject spacer fluid again in the cross-flow channel.
In one possible implementation, the apparatus further includes:
and a spacer fluid preparing module configured to dissolve a plant polymer in water and prepare the spacer fluid having a viscosity of 60 to 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, the apparatus further includes:
and the curing plugging agent configuration module is configured to dissolve the plant polymer and the inorganic particles in water to obtain the inorganic particle curing 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 well or the injection well.
The beneficial effects that technical scheme that this application embodiment provided include at least:
according to the technical scheme provided by the embodiment of the application, if the concentration of the oil displacement polymer in the produced fluid of the oil well reaches the reference concentration after the oil displacement polymer is injected into the polymer injection well, the development of a channeling channel between the oil well and the polymer injection well is good, and plugging is needed. The inorganic particle curing plugging agent is considered to realize filling of pore space and integral cementing type plugging, and has high strength after curing, so that the channeling channel is plugged by the inorganic particle curing plugging agent, and the plugging effect is improved. And when the fluid-channeling channel is plugged by the inorganic particle curing plugging agent, the flocculation effect of the oil-displacing polymer is considered to be good, and the inorganic particle curing plugging agent can form large particle floccules, so that the inorganic particle curing plugging agent loses the curing capability and the plugging effect is influenced, therefore, the isolating liquid is injected before the inorganic particle curing plugging agent is injected into the fluid-channeling channel so as to isolate the inorganic particle curing plugging agent which is injected next from the existing oil-displacing polymer in the fluid-channeling channel, and the isolating liquid is continuously injected after the inorganic particle curing plugging 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 curing plugging agent in the fluid-channeling channel, thereby ensuring the plugging effect of the fluid-channeling channel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for plugging a cross-flow channel according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for plugging a cross-flow channel according to an embodiment of the present application;
fig. 3 is a block diagram of a cross-flow channel plugging device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the 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 to describe various concepts, but 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.
The terms "at least one," "a plurality," "each," "any one," as used herein, include one, two or more, a plurality includes two or more, and each refers to each of a corresponding plurality, any one referring to any one of the plurality. For example, the plurality of cross-flow channels includes 3 cross-flow channels, and each of the 3 cross-flow channels refers to each of the 3 cross-flow channels, and any of the 3 cross-flow channels may be the first, the second, or the third.
Fig. 1 is a flowchart of a method for plugging a cross-flow channel according to an embodiment of the present application. The execution body is a cross flow channel plugging device. Referring to fig. 1, this embodiment includes:
101: and determining the concentration of the oil displacement polymer in the target produced fluid, wherein the target produced fluid is produced fluid of the oil well obtained after the oil displacement polymer is injected into the polymer injection well.
102: and if the concentration reaches the reference concentration, determining that a cross flow channel between the oil well and the polymer injection well meets the plugging condition.
103: under the condition that the cross flow channel meets the plugging condition, injecting isolating liquid into the cross flow channel.
104: and continuously injecting an inorganic particle curing plugging agent into the crossflow channel, wherein the isolating liquid is used for isolating the oil displacement polymer in the crossflow channel from the inorganic particle curing plugging agent.
105: and injecting the isolating liquid into the cross flow channel again.
According to the technical scheme provided by the embodiment of the application, if the concentration of the oil displacement polymer in the produced fluid of the oil well reaches the reference concentration after the oil displacement polymer is injected into the polymer injection well, the development of a channeling channel between the oil well and the polymer injection well is good, and plugging is needed. The inorganic particle curing plugging agent is considered to realize filling of pore space and integral cementing type plugging, and has high strength after curing, so that the channeling channel is plugged by the inorganic particle curing plugging agent, and the plugging effect is improved. And when the fluid-channeling channel is plugged by the inorganic particle curing plugging agent, the flocculation effect of the oil-displacing polymer is considered to be good, and the inorganic particle curing plugging agent can form large particle floccules, so that the inorganic particle curing plugging agent loses the curing capability and the plugging effect is influenced, therefore, the isolating liquid is injected before the inorganic particle curing plugging agent is injected into the fluid-channeling channel so as to isolate the inorganic particle curing plugging agent which is injected next from the existing oil-displacing polymer in the fluid-channeling channel, and the isolating liquid is continuously injected after the inorganic particle curing plugging 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 curing plugging agent in the fluid-channeling channel, thereby ensuring the plugging effect of the fluid-channeling channel.
In one possible implementation, before injecting the spacer fluid in the channeling channel, the method further comprises:
the plant polymer is dissolved in water to prepare a spacer fluid with the viscosity of 60-120 mPa.s.
In another possible implementation, the vegetable polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation, the method further comprises, before continuing to inject the inorganic particle cured plugging agent into the channeling channel:
and dissolving the plant polymer and the inorganic particles in water to obtain the inorganic particle curing plugging agent.
In another possible implementation, the inorganic particles include at least one of cement, clay, or fly ash.
In another possible implementation, injecting the spacer fluid in the cross-flow channel includes:
and injecting a spacer fluid into at least one of the oil well or the polymer injection well.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein in detail.
It should be noted that polymer flooding has become one of the important means for improving crude oil recovery in high water-content old oil fields in China at present. The polymer flooding is one effective method of raising recovery ratio, and it is mainly to raise the viscosity of water phase, lower the permeability of water phase and lower the fluidity ratio of water phase and oil phase, so as to expand the swept volume. In microcosmic, the oil displacement polymer generates a stretching effect on an oil film or oil drops in the flowing process due to inherent viscoelasticity, so that the carrying force is increased, and the microcosmic oil washing efficiency is improved. However, when the development of the cross flow channel between the oil well and the polymer injection well is good, the oil displacement polymer can cross flow into the oil well along the cross flow channel, so that the oil displacement efficiency of the oil displacement polymer is affected due to early output in the oil well, the waste of the oil displacement polymer is caused, the treatment difficulty of produced liquid is increased, and the cross flow channel is required to be plugged.
Under the condition that the development of the cross flow channel between the oil well and the polymer injection well is verified to be good, namely when the cross flow channel is developed to be completely communicated with the large pore canal, the residual oil in the cross flow channel is basically displaced. The inorganic particle curing plugging agent can realize filling and integral cementing type plugging of the pore space in the channeling channel, has high strength after curing, can prevent the oil displacement polymer from continuing channeling, and achieves the purpose of channeling sealing. Therefore, under the condition that the residual oil in the channeling passage is basically displaced, the channeling passage can be blocked by directly adopting the inorganic particle curing plugging agent so as to prevent the follow-up oil displacement polymer from continuing to circulate along the large pore canal in an ineffective way.
In the injection and polymerization development block, the adopted oil displacement polymer is anionic polyacrylamide, and the large-order long chain has a large adsorption surface area in water due to a long molecular chain, so the flocculation effect is good, and the oil displacement polymer can form large-particle floccules with inorganic particle curing plugging agents, so that the inorganic particle curing plugging agents lose curing capacity and thus lose plugging capacity. Thus, the present application proposes a new method of plugging a fluid channeling channel by solidifying a plugging agent with a spacer fluid and inorganic particles, as follows.
Fig. 2 is a flowchart of a method for plugging a cross-flow channel according to an embodiment of the present application. Referring to fig. 2, this embodiment includes:
201: the cross flow channel plugging device determines the concentration of the oil displacement polymer in the target produced fluid, wherein the target produced fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into the polymer injection well.
A polymer injection well is a well for injecting a flooding polymer into which the flooding polymer is injected, which flooding polymer will enter the formation, displace crude oil in the formation at an injection pressure, and thereby extract the crude oil from the well. However, due to the long-term scouring action of the oil displacement polymer, a communicating pore canal, namely a crossflow channel, is formed between the polymer injection well and the oil well, and the oil displacement polymer injected from the polymer injection well directly flows into the oil well through the crossflow channel, so that the oil displacement effect is lost.
Before plugging the cross flow channel between the oil well and the polymer injection well, the development condition of the cross flow channel is determined, and the cross flow channel is plugged under the condition that the development condition of the cross flow channel is good. In embodiments of the present application, the development of the fluid channeling is determined by injecting a displacement polymer into the injection well and then determining the concentration of the displacement polymer in the production fluid of the well.
It should be noted that the application is not limited to what kind of oil displacing polymer is used, and alternatively, the oil displacing polymer is a polyacrylamide solution.
202: if the concentration reaches the reference concentration, the cross flow channel plugging device determines that the cross flow channel between the oil well and the polymer injection well meets the plugging condition.
If the development condition of the crossflow channel is good, the oil displacement polymer can directly crossflow from the polymer injection well to the oil well along the crossflow channel, so that the concentration of the oil displacement polymer in the produced liquid is high. Therefore, when the concentration of the oil displacement polymer in the produced liquid reaches the reference concentration, the development condition of the crossflow channel is better, and the plugging condition is met.
Alternatively, the reference concentration is set to an arbitrary value, for example, 1010mg/L, according to the actual situation, which is not limited in the embodiment of the present application.
203: the cross flow channel plugging device is used for dissolving the plant polymer in water to prepare the isolating liquid with the viscosity of 60-120 mPa.s.
The spacer fluid is used for separating the oil displacement polymer from the inorganic particle curing plugging agent for plugging the channeling passage, so that the oil displacement polymer and the inorganic particle curing plugging agent are prevented from undergoing flocculation reaction to influence the curing of the inorganic particle curing plugging agent, and the waste of the inorganic particle curing plugging agent is avoided. And the isolating liquid has certain viscosity and can play a role in filling the pore space 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 of the present application are not limited thereto.
Optionally, the cross-flow channel plugging device dissolves the plant polymer in water, and the implementation mode of the spacer fluid with the viscosity of 60-120 mPa.s is as follows: the cross flow channel plugging device is characterized in that 0.6-1.2 parts of plant polymer is added into 100 parts of water, and the first reference time is dispersed and dissolved 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 to 10 minutes. Wherein the mass of one part of water is the same as the mass of one part of vegetable polymer.
Note that 203 can be executed before 201 or after 202, or can be executed between 201 and 202, or can be executed simultaneously with 201 or 202, which is not limited in the embodiment of the present application.
204: the device for plugging the cross flow channel injects isolating liquid into the cross flow channel under the condition that the cross flow channel meets plugging conditions.
The device for plugging the cross flow channel is used for injecting the configured isolation liquid into the cross flow channel under the condition that the cross flow channel meets the plugging condition so as to isolate the oil displacement polymer in the cross flow channel from the inorganic particle solidifying plugging agent injected later.
Optionally, the implementation manner of injecting the isolation liquid into the cross flow channel by the cross flow channel plugging device is as follows: the fluid-channeling channel plugging device injects the spacer fluid into at least one of the well or the injection well so that the spacer fluid enters the fluid-channeling channel. The isolation liquid is respectively injected from the oil well and the polymer injection well, so that the surface of the cross flow channel can be ensured to be uniformly covered with the isolation liquid, and the isolation effect is improved.
The embodiment of the present application does not limit the amount of spacer fluid injected. Optionally, the amount of the injected isolating liquid is 5-30 m 3 。
205: the cross flow channel plugging device dissolves the plant polymer and the inorganic particles in water to obtain the inorganic particle curing plugging agent.
Because the inorganic particle curing plugging agent is consistent with the spacer fluid and is also prepared from plant polymers, the compatibility of the inorganic particle curing plugging agent and the spacer fluid is good, and the inorganic particle curing plugging agent and the spacer fluid cannot react, so that the curing of the inorganic particle curing plugging agent cannot be influenced.
Optionally, the cross-flow channel plugging device dissolves the plant polymer and the inorganic particles in water to obtain the inorganic particle curing plugging agent by the following implementation modes: the cross flow channel plugging device is characterized in that 0.1-0.5 part of plant polymer is added into 100 parts of water, the second reference time is dispersed and dissolved, and then 120-180 parts of inorganic particles are added, and the third reference time is dispersed and dissolved, so that the inorganic particle curing plugging agent is obtained. Optionally, the first reference time period is any time period within 5 to 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 the vegetable polymer and the mass of one part of the 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 are not limited thereto.
It should be noted that the embodiment of the present application does not require the sequence between 205 and 201 to 204.
206: the plugging device for the cross flow channel continuously injects inorganic particle solidifying plugging agent into the cross flow channel.
Because the isolation liquid is injected into the cross flow channel, the inorganic particle curing plugging agent is injected at the moment, and the inorganic particle curing plugging agent cannot contact with the oil displacement polymer in the cross flow channel, so that no reaction occurs. And the inorganic particle curing plugging agent has high strength, so that a channeling channel can be effectively plugged, and the plugging quality is good.
Optionally, the implementation manner of injecting the inorganic particle curing plugging agent into the cross flow channel by the cross flow channel plugging device is as follows: the cross flow channel plugging device injects inorganic particle curing plugging agent into at least one well of the oil well or the polymer injection well so that the inorganic particle curing plugging agent enters the cross flow channel. Inorganic particle curing plugging agents are respectively injected into the oil well and the polymer injection well, so that the plugging efficiency of the crossflow channel can be improved, and the plugging quality of the crossflow channel can be improved.
In the examples herein, the amount of inorganic particulate curative plugging agent injected is not required. Optionally, the amount of the injected inorganic particle curing plugging agent is 5-40 m 3 。
207: the isolation liquid is injected into the cross flow channel again by the cross flow channel plugging device.
In the embodiment of the application, after plugging the channeling channel, the oil displacement polymer is needed to be injected into the polymer injection well for oil displacement, so that the inorganic particle curing plugging agent injected into the channeling channel is prevented from reacting with the oil displacement polymer, and after the inorganic particle curing plugging agent is injected into the channeling channel, the spacer fluid is injected into the channeling channel again, so that the inorganic particle curing plugging agent is thoroughly isolated from the oil displacement polymer, the curing effect of the inorganic particle curing plugging agent is ensured, and the plugging quality of the channeling channel is ensured.
It should be noted that after the spacer is injected, the well needs to be shut in and the inorganic particle curing plugging agent needs to be waited for to be solidified. Optionally, the duration of waiting for solidification of the curing plugging agent is set according to practical situations, for example, the waiting duration is 48-72 h.
The plugging scheme of the channeling channel is described below by way of several specific examples.
The plugging protocol of example 1 is as follows:
(1) The concentration of the oil displacement polymer in the produced liquid of the oil well is 1010mg/L, and the channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing a spacer fluid: 1.2 parts of carboxymethyl cellulose is taken and added into 100 parts of water, and dispersed and dissolved for 10 minutes to prepare the spacer fluid with the viscosity of 80-100 mPa.s.
(3) Preparing an inorganic particle curing plugging agent: adding 0.5 part of carboxymethyl cellulose into 100 parts of water, dispersing and dissolving for 10 minutes, adding 100 parts of cement and 20 parts of clay, dispersing and dissolving for 20 minutes, and preparing the inorganic particle curing plugging agent.
(4) And (3) performing plugging construction: firstly, injecting a spacer fluid 5m into a crossflow channel 3 Injecting inorganic particle curing plugging agent 40m into the channeling channel 3 Finally, injecting the isolating liquid 5m into the crossflow channel 3 。
(5) Shut in and wait for solidification for 72h.
The plugging protocol of example 2 is as follows:
(1) The concentration of the oil displacement polymer in the produced liquid of the oil well is 1216mg/L, and the channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing a spacer fluid: 0.8 part of hydroxyethyl cellulose is taken and added into 100 parts of water, and dispersed and dissolved for 10 minutes to prepare the spacer fluid with the viscosity of 100-120 mPa.s.
(3) Preparing an inorganic particle curing plugging agent: 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 into the inorganic particle curing plugging agent.
(4) And (3) performing plugging construction: firstly, injecting a spacer fluid 15m into a crossflow channel 3 Then injecting inorganic particle curing plugging agent 13m into the crossflow channel 3 Finally, injecting the isolating liquid 5m into the crossflow channel 3 。
(5) The well is shut in and the solidification is waited for 48 hours.
The plugging protocol of example 3 is as follows:
(1) The concentration of the oil displacement polymer in the produced liquid of the oil well is 1058mg/L, and the channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing a spacer fluid: 1.0 part of guanidine gum is taken and added into 100 parts of water, and dispersed and dissolved for 10 minutes to prepare the spacer fluid with the viscosity of 80-100 mPa.s.
(3) Preparing an inorganic particle curing plugging agent: 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) And (3) performing plugging construction: firstly, injecting a spacer fluid 20m into a crossflow channel 3 Then in the cross-flowInorganic particle curing plugging agent is injected into the channel for 6m 3 Finally, injecting the isolating liquid 10m into the crossflow channel 3 。
(5) The well is shut in and the solidification is waited for 48 hours.
The plugging protocol of example 4 is as follows:
(1) The concentration of the oil displacement polymer in the produced liquid of the oil well is 1120mg/L, and the channeling channel between the oil well and the polymer injection well is determined to meet the plugging condition according to the concentration.
(2) Preparing a spacer fluid: adding 0.6 part of hydroxypropyl guanidine gum into 100 parts of water, dispersing and dissolving for 10 minutes, and preparing a spacer fluid with the viscosity of 80-100 mPa.s.
(3) Preparing an inorganic particle curing plugging agent: adding 0.3 part of hydroxypropyl guanidine 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 curing plugging agent.
(4) And (3) performing plugging construction: firstly, injecting a spacer fluid 30m into a crossflow channel 3 Then injecting inorganic particle curing plugging agent 9m into the channeling channel 3 Finally, injecting the isolating liquid 5m into the crossflow channel 3 。
(5) Shut in and wait for solidification for 72h.
The following is a specific application of the channeling channel plugging method:
(1) And a certain polymer injection well corresponds to 100% of water in the oil well, and the concentration of the oil displacement polymer in the produced liquid is as high as 1216mg/L, so that the development of a cross flow channel between the oil well and the polymer injection well is good. The following plugging process is adopted: firstly, injecting a spacer fluid 15m into a crossflow channel 3 Then injecting inorganic particle curing plugging agent 13m into the crossflow channel 3 Finally, injecting the isolating liquid 5m into the crossflow channel 3 . And then the injection well resumes normal injection, and the accumulated injection of the oil-displacing polymer is 5.1×104m 3 No channeling phenomenon occurs in the corresponding oil well.
(2) And in the process of injection, the concentration of the oil displacement polymer in the corresponding oil well produced liquid rises quickly from 501mg/L to 1010mg/L, and accordingly, the development of a channeling channel between the oil well and the injection well is judged until the plugging condition is met. The following plugging process is adopted: first, the fluid is circulated in the cross flowInjecting isolating liquid 5m 3 Injecting inorganic particle curing plugging agent 40m into the channeling channel 3 Finally, injecting the isolating liquid 5m into the crossflow channel 3 . And then the oil well resumes normal production, and the yield of crude oil is increased by 406 tons.
According to the technical scheme provided by the embodiment of the application, if the concentration of the oil displacement polymer in the produced fluid of the oil well reaches the reference concentration after the oil displacement polymer is injected into the polymer injection well, the development of a channeling channel between the oil well and the polymer injection well is good, and plugging is needed. The inorganic particle curing plugging agent is considered to realize filling of pore space and integral cementing type plugging, and has high strength after curing, so that the channeling channel is plugged by the inorganic particle curing plugging agent, and the plugging effect is improved. And when the fluid-channeling channel is plugged by the inorganic particle curing plugging agent, the flocculation effect of the oil-displacing polymer is considered to be good, and the inorganic particle curing plugging agent can form large particle floccules, so that the inorganic particle curing plugging agent loses the curing capability and the plugging effect is influenced, therefore, the isolating liquid is injected before the inorganic particle curing plugging agent is injected into the fluid-channeling channel so as to isolate the inorganic particle curing plugging agent which is injected next from the existing oil-displacing polymer in the fluid-channeling channel, and the isolating liquid is continuously injected after the inorganic particle curing plugging 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 curing plugging agent in the fluid-channeling channel, thereby ensuring the plugging effect of the fluid-channeling channel.
Fig. 3 is a block diagram of a cross-flow channel plugging device according to an embodiment of the present application. Referring to fig. 3, the apparatus includes:
a concentration determination module 301 configured to determine a concentration of the flooding polymer in a target production fluid, the target production fluid being a production fluid of the well obtained after injection of the flooding polymer in the injection well;
a plugging condition determination module 302 configured to determine that a cross-flow channel between the well and the injection well satisfies a plugging condition if the concentration reaches a reference concentration;
an isolation liquid injection module 303 configured to inject an isolation liquid in the cross-flow channel if the cross-flow channel satisfies a blocking condition;
a curing plugging agent injection module 304 configured to continue injecting an inorganic particle curing plugging agent in the fluid-channeling channel, the spacer fluid being used to isolate the oil-displacing polymer in the fluid-channeling channel from the inorganic particle curing plugging agent;
the spacer fluid injection module 303 is further configured to inject spacer fluid again in the cross-flow channel.
In one possible implementation, the apparatus further includes:
and a spacer preparation module configured to dissolve the plant polymer in water and prepare a spacer having a viscosity of 60 to 120 mpa.s.
In another possible implementation, the vegetable polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guar, or guar.
In another possible implementation, the apparatus further includes:
and the curing plugging agent configuration module is configured to dissolve the plant polymer and the inorganic particles in water to obtain the inorganic particle curing 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 spacer fluid in at least one of the well or the polymer injection well.
According to the technical scheme provided by the embodiment of the application, if the concentration of the oil displacement polymer in the produced fluid of the oil well reaches the reference concentration after the oil displacement polymer is injected into the polymer injection well, the development of a channeling channel between the oil well and the polymer injection well is good, and plugging is needed. The inorganic particle curing plugging agent is considered to realize filling of pore space and integral cementing type plugging, and has high strength after curing, so that the channeling channel is plugged by the inorganic particle curing plugging agent, and the plugging effect is improved. And when the fluid-channeling channel is plugged by the inorganic particle curing plugging agent, the flocculation effect of the oil-displacing polymer is considered to be good, and the inorganic particle curing plugging agent can form large particle floccules, so that the inorganic particle curing plugging agent loses the curing capability and the plugging effect is influenced, therefore, the isolating liquid is injected before the inorganic particle curing plugging agent is injected into the fluid-channeling channel so as to isolate the inorganic particle curing plugging agent which is injected next from the existing oil-displacing polymer in the fluid-channeling channel, and the isolating liquid is continuously injected after the inorganic particle curing plugging 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 curing plugging agent in the fluid-channeling channel, thereby ensuring the plugging effect of the fluid-channeling channel.
It should be noted that: in the above embodiment, when the plugging device for a fluid-channeling channel is used for plugging the fluid-channeling channel, only the division of the functional modules is used for illustration, and in practical application, the functional distribution can be completed by different functional modules according to needs, that is, the internal structure of the plugging device for a fluid-channeling channel is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the foregoing embodiments of the plugging device for a cross-flow channel and the method embodiment for plugging a cross-flow channel belong to the same concept, and detailed implementation processes of the plugging device for a cross-flow channel are detailed in the method embodiment and are not described herein.
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 for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended that all modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention.
Claims (3)
1. A method for plugging a cross-flow channel, the method comprising:
determining the concentration of an oil displacement polymer in a target produced fluid, wherein the target produced fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into an 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 cross flow channel meets the plugging condition, injecting isolation liquid into the cross flow channel, wherein the step of injecting the isolation liquid into the cross flow channel comprises the step of injecting the isolation liquid from the oil well and the polymer injection well respectively so as to ensure that the surface of the cross flow channel uniformly covers the isolation liquid;
continuously injecting an inorganic particle curing plugging agent into the channeling channel, wherein the spacer fluid is used for isolating an oil displacement polymer in the channeling channel from the inorganic particle curing plugging agent, and the continuously injecting the inorganic particle curing plugging agent into the channeling channel comprises respectively injecting the inorganic particle curing plugging agent from the oil well and the polymer injection well so as to improve the plugging efficiency of the channeling channel;
injecting an isolating liquid into the channeling channel again to thoroughly isolate the inorganic particle curing plugging agent from the oil displacement polymer;
the method further comprises, prior to injecting spacer fluid into the cross-flow channel: adding 0.6-1.2 parts of plant polymer into 100 parts of water, and dispersing and dissolving for a first reference time period to obtain the spacer fluid with the viscosity of 60-120 mPa.s, wherein the mass of one part of water is the same as that of one part of plant polymer; the plant polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guanidine gum or guanidine gum;
before the inorganic particle curing plugging agent is continuously injected into the channeling channel, the method further comprises the following steps: adding 0.1-0.5 part of plant polymer into 100 parts of water, dispersing and dissolving for a second reference time period, adding 120-180 parts of inorganic particles, dispersing and dissolving for a third reference time period, and obtaining the inorganic particle curing plugging agent, wherein the mass of one part of water is the same as that of one part of plant polymer, and the mass of one part of inorganic particle is the same as that of one part of inorganic particle.
2. The method of claim 1, wherein the inorganic particles comprise at least one of cement, clay, or fly ash.
3. A cross-flow channel plugging device, the device comprising:
the concentration determining module is configured to determine the concentration of the oil displacement polymer in a target production fluid, wherein the target production fluid is produced fluid of an oil well obtained after the oil displacement polymer is injected into the polymer injection well;
the plugging condition determining module is configured to determine that a cross flow channel between the oil well and the polymer injection well meets plugging conditions if the concentration reaches a reference concentration;
the isolation liquid injection module is configured to inject isolation liquid into the cross flow channel under the condition that the cross flow channel meets the blocking condition; the isolation liquid injection module is further configured to inject isolation liquid from the oil well and the polymer injection well respectively so as to ensure that the surface of the channeling channel is uniformly covered with the isolation liquid;
a curing plugging agent injection module configured to continue injecting an inorganic particle curing plugging agent in the fluid-channeling channel, the spacer fluid being used to isolate the oil-displacing polymer in the fluid-channeling channel from the inorganic particle curing plugging agent; the curing plugging agent injection module is further configured to inject the inorganic particle curing plugging agent from the oil well and the polymer injection well respectively so as to improve the plugging efficiency of the channeling channel;
the spacer fluid injection module is further configured to inject spacer fluid into the channeling channel again to thoroughly isolate the inorganic particle curing plugging agent from the oil displacement polymer;
the spacer fluid preparation module is configured to add 0.6-1.2 parts of plant polymer into 100 parts of water, and disperse and dissolve the spacer fluid for a first reference period of time to obtain spacer fluid with the viscosity of 60-120 mPa.s, wherein the mass of one part of water is the same as the mass of one part of plant polymer; the plant polymer comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl guanidine gum or guanidine gum;
the inorganic particle curing plugging agent configuration module is configured to add 0.1-0.5 part of plant polymer into 100 parts of water, disperse and dissolve the second reference time, add 120-180 parts of inorganic particles, disperse and dissolve the third reference time, and obtain the inorganic particle curing plugging agent, wherein the mass of one part of water is the same as the mass of one part of plant polymer, and the mass of one part of inorganic particle is the same.
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| CN104564049A (en) * | 2015-01-22 | 2015-04-29 | 中国石油大学(华东) | Detection method of polymer flooding and gathering channel |
| CN104712297A (en) * | 2015-01-12 | 2015-06-17 | 中国石油大学(华东) | Screening method of polymer injection inferior efficiency well and polymer gather well |
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| CN104712297A (en) * | 2015-01-12 | 2015-06-17 | 中国石油大学(华东) | Screening method of polymer injection inferior efficiency well and polymer gather well |
| CN104564049A (en) * | 2015-01-22 | 2015-04-29 | 中国石油大学(华东) | Detection method of polymer flooding and gathering channel |
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