CN110714752A - Method and device for monitoring seepage channels of communicated well group - Google Patents
Method and device for monitoring seepage channels of communicated well group Download PDFInfo
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- CN110714752A CN110714752A CN201810673516.0A CN201810673516A CN110714752A CN 110714752 A CN110714752 A CN 110714752A CN 201810673516 A CN201810673516 A CN 201810673516A CN 110714752 A CN110714752 A CN 110714752A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
Abstract
The invention provides a monitoring method and a device for a seepage channel of a communication well group, wherein a first path length of the seepage channel of a reservoir is determined according to a first flow time period of a first tracer in the reservoir, a first pressure difference at the bottom of the communication well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; determining a second path length of a reservoir seepage channel according to a second flow time period of a second tracer in the reservoir, a second pressure difference of a communication well group at the bottom of the well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; the putting time of the first tracer is earlier than that of the second tracer; when the difference value between the second path length and the first path length is smaller than the preset difference value, the monitoring device sends out first prompt information for forming the dominant seepage channel in the reservoir, so that the real-time monitoring of the path length of the seepage channel is realized, the operation switching is timely carried out after the dominant seepage channel is formed, and the recovery system is ensured to have stable and high recovery ratio.
Description
Technical Field
The invention relates to the technical field of petroleum development, in particular to a method and a device for monitoring a seepage channel of a communicated well group.
Background
Water injection exploitation refers to the process of oil field development in which water is injected into an oil reservoir through a special injection well to maintain or restore the pressure of the oil reservoir, so that the oil reservoir has strong driving force to improve the exploitation rate and recovery ratio of the oil reservoir. In the oil reservoir water injection development, due to the influence of factors such as the heterogeneity of an oil layer, the unfavorable oil-water flow rate ratio and the like, the production dynamics shows low water injection utilization rate, low sweep efficiency, rapid rise of the water content of a production well and high water flooding degree along with the extension of water injection development time. These performance characteristics of the production dynamics inside and outside the reservoir indicate that the reservoir has formed an obvious dominant seepage channel, which seriously affects the water drive development effect and is not beneficial to the sustainable development of the reservoir. How to control the water production and stabilize or improve the oil well yield is a problem which must be solved in the later stage of oilfield flooding development.
The profile control technology is an important oil and water stabilizing and controlling technology after an oil field is developed by water injection and enters a medium-high water content period. The profile control of the water injection well can effectively improve the water absorption profile of the water well, relieve the contradiction between layers and in layers in the later stage of oil reservoir development, utilize a medium-low permeable layer with high residual oil saturation, inhibit the tongue advance and finger advance of injected water, improve the wave and volume of subsequent injected water and improve the water injection development effect.
However, the lack of quantitative characterization of the seepage passage leads to the failure to judge whether the current reservoir forms a dominant seepage passage or not, and the failure to adjust the water injection of the connected well group in time, which greatly restricts the development of the oil field.
Disclosure of Invention
The invention provides a method and a device for monitoring a seepage channel of a communicated well group, which are used for realizing the real-time monitoring of the path length of the seepage channel, and timely switching the operation after determining the formation of a dominant seepage channel so as to ensure that a recovery system has stable and higher recovery ratio.
The invention provides a monitoring method for a seepage channel of a communicated well group, which comprises the following steps:
in the first water injection operation, determining a first path length of a reservoir seepage channel according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
determining a second path length of the reservoir percolation path based on a second flow time period of a second tracer in the reservoir, a second pressure differential across the bottom of the well group within the second flow time period, a permeability of the reservoir, and a viscosity of a fluid within the reservoir; wherein the dosing time of the first tracer is earlier than the dosing time of the second tracer;
and judging whether the difference value between the second path length and the first path length is smaller than a preset difference value, if so, sending first prompt information of the reservoir forming a dominant seepage channel so that an operator starts profile control operation according to the first prompt information.
Optionally, before determining the first path length of the reservoir percolation path according to the first flow time period of the first tracer in the reservoir, the first pressure difference communicated to the bottom of the well group in the first flow time period, the permeability of the reservoir, and the viscosity of the fluid in the reservoir, the method further includes:
determining a first flow time period of a first tracer in the reservoir based on a first time instant at which the first tracer is injected and a second time instant at which the first tracer is detected;
and determining a first pressure difference communicated with the bottom of the well group in the first flow time period according to a first pressure value at the bottom of the oil production well and a second pressure value at the bottom of the water injection well in the first flow time period.
Optionally, before determining the second path length of the reservoir seepage channel according to the second flow time period of the second tracer in the reservoir, the second pressure difference communicated with the bottom of the well group in the second flow time period, the permeability of the reservoir, and the viscosity of the fluid in the reservoir, the method further includes:
determining a second flow period of the second tracer in the reservoir based on a third time instant at which the second tracer is injected and a fourth time instant at which the second tracer is detected;
and determining a second pressure difference of the bottom of the communication well group in the second flow time period according to a third pressure value of the bottom of the oil production well and a fourth pressure value of the bottom of the water injection well in the second flow time period.
Optionally, the first path length and the second path length are determined by using the following formulas:
wherein, Δ L is the path length, K is the permeability of the reservoir, Δ P is the pressure difference at the bottom of the communicating well group, is the flow time period of the tracer in the reservoir, and μ is the viscosity of the fluid in the reservoir.
Optionally, the method further includes:
after the profile control operation, determining a third path length of the reservoir seepage passage according to a third flow time period of a third tracer in the reservoir, a third pressure difference communicated to the bottom of the well group within the third flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
and judging whether the difference value between the third path length and the second path length is greater than a preset difference value, if so, sending second prompt information that the profile control operation achieves the expected effect, so that an operator can continue the water injection operation according to the second prompt information.
Optionally, before determining the third path length of the reservoir percolation path according to the third flow time period of the third tracer in the reservoir, the third pressure difference communicated to the bottom of the well group in the third flow time period, the permeability of the reservoir, and the viscosity of the fluid in the reservoir, the method further includes:
determining a third flow time period for a third tracer in the reservoir based on a fifth time instant at which the third tracer is injected and a sixth time instant at which the third tracer is detected;
and determining a third pressure difference communicated with the bottom of the well group in the third flow time period according to a fifth pressure value at the bottom of the oil production well and a sixth pressure value at the bottom of the water injection well in the third flow time period.
Optionally, if the difference between the third path length and the second path length is less than or equal to a preset difference, third prompt information indicating that the profile control operation does not reach the expected effect is sent out, so that an operator continues the profile control operation according to the third prompt information.
In a second aspect, the present invention provides a monitoring device for a seepage passage communicating with a well group, comprising:
the determination module is used for determining a first path length of a reservoir seepage channel in a first water injection operation according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
the determination module is further used for determining a second path length of the reservoir seepage channel according to a second flow time period of a second tracer in the reservoir, a second pressure difference at the bottom of a communication well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; wherein the dosing time of the first tracer is earlier than the dosing time of the second tracer;
and the judging module is used for judging whether the difference value between the second path length and the first path length is smaller than a preset difference value, if so, the prompting module is used for sending first prompting information of the reservoir formation dominant seepage channel so that an operator can start profile control operation according to the first prompting information.
Optionally, the determining module is further configured to determine a first flow time period of the first tracer in the reservoir according to a first time instant when the first tracer is injected and a second time instant when the first tracer is detected;
the determining module is further configured to determine a first pressure difference at the bottom of the communication well group in the first flow time period according to a first pressure value at the bottom of the oil production well and a second pressure value at the bottom of the water injection well in the first flow time period.
Optionally, the determining module is further configured to determine a second flow time period of the second tracer in the reservoir according to a third time instant when the second tracer is injected and a fourth time instant when the second tracer is detected;
the determining module is further used for determining a second pressure difference at the bottom of the communication well group in the second flow time period according to a third pressure value at the bottom of the oil production well and a fourth pressure value at the bottom of the water injection well in the second flow time period.
Optionally, the first path length and the second path length are determined by using the following formulas:
wherein, Δ L is the path length, K is the permeability of the reservoir, Δ P is the pressure difference at the bottom of the communicating well group, Δ t is the flow time period of the tracer in the reservoir, and μ is the viscosity of the fluid in the reservoir.
Optionally, the determining module is further configured to determine, after the profile control operation, a third path length of the reservoir seepage passage according to a third flow time period of a third tracer in the reservoir, a third pressure difference at a bottom of a communication well group in the third flow time period, the permeability of the reservoir, and the viscosity of fluid in the reservoir;
the judging module is further used for judging whether the difference value between the third path length and the second path length is larger than a preset difference value or not, and if yes, the prompting module is further used for sending second prompting information that the profile control operation achieves an expected effect, so that an operator can continue water injection operation according to the second prompting information.
Optionally, the determining module is further configured to determine a third flow time period of the third tracer in the reservoir according to a fifth time instant when the third tracer is injected and a sixth time instant when the third tracer is detected;
the determining module is further configured to determine a third pressure difference at the bottom of the communication well group in the third flow time period according to a fifth pressure value at the bottom of the production well and a sixth pressure value at the bottom of the water injection well in the third flow time period.
Optionally, the prompt module is further configured to send a third prompt message that the profile control operation does not reach the expected effect if the difference between the third path length and the second path length is less than or equal to a preset difference, so that an operator continues the profile control operation according to the third prompt message.
In a third aspect, the present invention provides a monitoring device for a seepage passage communicating with a well group, comprising:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method according to any one of the first aspect of the invention.
A fourth aspect of the invention provides a computer readable storage medium having stored thereon a computer program for execution by a processor to perform the method according to any one of the first aspect of the invention.
According to the monitoring method and the monitoring device for the seepage channel of the connected well group, provided by the embodiment of the invention, the first path length of the seepage channel of the reservoir is determined according to the first flow time period of the first tracer in the reservoir, the first pressure difference at the bottom of the connected well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; determining a second path length of a reservoir seepage channel according to a second flow time period of a second tracer in the reservoir, a second pressure difference of a communication well group at the bottom of the well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; the release time of the first tracer is earlier than that of the second tracer; and when the difference value between the second path length and the first path length is smaller than the preset difference value, sending first prompt information of a reservoir formation dominant seepage channel by the monitoring device so that an operator starts profile control operation according to the first prompt information. By the method, the length of the seepage channel path is monitored in real time, operation switching is timely performed after the formation of the dominant seepage channel is determined, and the recovery system is ensured to have stable and high recovery ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a monitoring method for a seepage passage of a connected well group according to the present invention;
FIG. 2 is a first schematic flow chart of a monitoring method for seepage channels of a connected well group according to the present invention;
FIG. 3 is a second schematic flow chart of the monitoring method for the seepage passage of the connected well group according to the present invention;
FIG. 4 is a schematic structural diagram of a monitoring device connected to a seepage passage of a well group according to the present invention;
fig. 5 is a hardware structure diagram of the monitoring device communicated with the seepage channel of the well group provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
Fig. 1 is a schematic view of a scene of a method for monitoring a seepage passage of a connected well group provided by the present invention, as shown in fig. 1, in water injection development of an oil reservoir, the connected well group comprises an oil production well and a water injection well, and by injecting water into the water injection well, the seepage passage in fig. 1 is formed to maintain or recover reservoir pressure, so that the oil reservoir has strong driving force to improve the production rate and the recovery ratio of the oil reservoir. However, in the later stage of water injection development, when a dominant seepage channel is formed in a reservoir, the water content of the oil production well rises rapidly, so that the water circulation between the oil production well and the water injection well is low in efficiency and even ineffective, the water injection development efficiency is seriously influenced, and the sustainable development of an oil reservoir is not facilitated.
The monitoring method of the seepage channels of the communicated well groups provided by the embodiment of the invention provides a quantitative characterization method for the path length of the seepage channels of the communicated well groups, and whether the dominant seepage channels are formed or not is judged by monitoring the path length of the seepage channels of the communicated well groups in real time, so that effective measures can be taken in time to prevent invalid water injection.
The monitoring method of the seepage channel of the communicated well group provided by the invention is described in detail by combining specific embodiments. Fig. 2 is a schematic flow chart of a first method for monitoring a seepage passage of a connected well group provided by the present invention, and as shown in fig. 2, the method for detecting a seepage passage of a connected well group provided by this embodiment includes the following steps:
s201, determining a first path length of a reservoir seepage channel according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
s202, determining a second path length of a reservoir seepage channel according to a second flow time period of a second tracer in a reservoir, a second pressure difference at the bottom of a communicated well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; the release time of the first tracer is earlier than that of the second tracer;
in the first water injection operation, when the injection amount of the water injection well is substantially equal to the output amount of the oil production well, an operator starts to periodically put a tracer into the water injection well, where the tracer is used to monitor the flow parameters of the injected water in the reservoir, and common tracers include an isotope tracer, an enzyme-labeled tracer, a fluorescent-labeled tracer, a spin-labeled tracer, and the like, which is not specifically limited in this embodiment.
It should be noted that, in this embodiment, the first tracer and the second tracer that are put in adjacent time periods are different tracers, so as to detect the seepage condition of the seepage passage in the reservoir in real time, and avoid confusion among the tracers. After monitoring the first tracer, the operator can reuse the first tracer when putting next time, and similarly, the above putting principle is also applicable to the second tracer.
Before S201, the monitoring device obtains a first time point of injecting the first tracer and a second time point of detecting the first tracer through the timing device, and determines a first flow time period of the first tracer in the reservoir. Meanwhile, the monitoring device obtains a first pressure value at the bottom of the oil production well and a second pressure value at the bottom of the water injection well in a first flow time period through pressure detection devices arranged at the bottom of the oil production well and the bottom of the water injection well respectively, and determines a first pressure difference at the bottom of the communication well group in the first flow time period.
Similarly, prior to S202, the monitoring device obtains a third time instant at which the second tracer is injected and a fourth time instant at which the second tracer is detected by the timing device, and determines a second flow time period of the second tracer in the reservoir. Meanwhile, the monitoring device obtains a third pressure value at the bottom of the oil production well and a fourth pressure value at the bottom of the water injection well in a second flow time period through pressure detection devices arranged at the bottom of the oil production well and the bottom of the water injection well respectively, and determines a second pressure difference communicated with the bottom of the well group in the second flow time period.
In this example, the permeability of the reservoir reflects the ability of fluid to penetrate through the reservoir, and the permeability of the reservoir prior to the first waterflood is determined by collecting a sample of the reservoir.
The viscosity of the fluid in the reservoir refers to the property that when the fluid moves, the fluid is prevented from moving relatively by the internal friction force generated between the micelles or flow layers inside the fluid due to the relative movement, and obviously any actual fluid is viscous, and the viscosity is the inherent property of the actual fluid and directly influences the flow and heat transfer performance of the fluid. In this embodiment, the viscosity of the fluid in the reservoir is determined by collecting the fluid in the reservoir in advance.
According to the flow time of the tracer in the reservoir, the pressure difference of the bottom of the communicated well group in the flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir, the path length of the tracer in a reservoir seepage channel can be determined, and the technical personnel in the field can understand that the flow time of the tracer in the reservoir seepage channel is shorter and shorter in different flow time periods, correspondingly, the path length of the tracer in the reservoir seepage channel is shorter and shorter, and the monitoring device judges whether a dominant seepage channel is formed or not by monitoring the change of the path length in real time, wherein the specific judgment condition is shown in S203.
S203, if the difference value between the second path length and the first path length is smaller than the preset difference value, first prompt information of a reservoir formation dominant seepage channel is sent out, so that an operator can start profile control operation according to the first prompt information.
The monitoring device determines the sizes of the first path length and the second path length according to the first path length and the second path length determined in S201 and S202, and it can be understood that when the second path length is smaller than the first path length, it indicates that the dominant seepage channel has not been formed yet, and the water injection operation has an effect of improving the recovery ratio, and when the difference between the second path length and the first path length is smaller than a preset difference, that is, when the second path length is equal to or close to the first path length, it indicates that the dominant seepage channel has been formed in the current reservoir, and the water injection effect is deteriorated, and at this time, the water injection operation needs to be stopped, and the profile control operation is performed to open up a new seepage channel, and the recovery operation is continued in the new seepage channel.
And when the monitoring device determines that the difference value between the second path length and the first path length is smaller than the preset difference value, sending first prompt information of a reservoir formation dominant seepage channel so that an operator starts profile control operation according to the first prompt information.
Specifically, the profile control operation refers to the operation of plugging a high permeable zone from a water injection well, and the water absorption profile of a water injection layer section can be adjusted to reduce the water production of a production well. And plugging the dominant seepage channel through profile control operation to form a new seepage channel, and recovering the oil storage of a new channel layer.
The method for profile control and plugging of the high permeable zone of the water injection well comprises the following two possible implementation modes.
One possible implementation is a single-liquid approach.
The single-liquid method is to inject a liquid into the oil layer, and after the liquid enters the oil layer, the liquid reacts by itself, and then the changed substance can block the high permeable layer, so as to reduce the permeability and realize water blocking. The common single-liquid plugging agent includes lime milk, silicic acid sol, chromium jelly, sulfuric acid, thick oil in water, etc. The present example is not particularly limited to the one-pack type plugging agent.
Another possible implementation is a two-liquid process.
The two-fluid method is to inject two kinds of reactable liquids separated by a spacer fluid into an oil layer. When the two kinds of liquid are pushed to the inside of the oil layer for a certain distance, the isolating liquid becomes thin to be incapable of isolating, and the two kinds of liquid can react to generate a substance for plugging the stratum. As more plugging agent is absorbed into the permeable layer, plugging mainly occurs in the high permeable layer, thereby achieving the purpose of profile control. The common plugging agents of the two-liquid method mainly comprise precipitation type plugging agents, gel type plugging agents, jelly type plugging agents, colloidal dispersion type plugging agents and the like. The two-component plugging agent is not particularly limited in this embodiment.
Optionally, when the ratio of the absolute value of the difference between the second path length and the first path length to the first path length is smaller than a preset ratio, for example, 5%, the monitoring device sends a first prompt message indicating that the reservoir forms the dominant seepage channel.
According to the monitoring method of the seepage channel of the connected well group, provided by the embodiment of the invention, the first path length of the seepage channel of the reservoir is determined according to the first flow time period of the first tracer in the reservoir, the first pressure difference at the bottom of the connected well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; determining a second path length of a reservoir seepage channel according to a second flow time period of a second tracer in the reservoir, a second pressure difference of a communication well group at the bottom of the well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; the release time of the first tracer is earlier than that of the second tracer; and when the difference value between the second path length and the first path length is determined to be a preset difference value, sending first prompt information of a reservoir formation dominant seepage channel by the monitoring device so that an operator can start profile control operation according to the first prompt information. By the method, the length of the seepage channel path is monitored in real time, operation switching is timely performed after the formation of the dominant seepage channel is determined, and the recovery system is ensured to have stable and high recovery ratio.
Fig. 3 is a schematic flow chart of a second method for monitoring a seepage passage of a connected well group provided by the present invention, and as shown in fig. 3, the method for monitoring a seepage passage of a connected well group provided by this embodiment includes the following steps:
s301, determining a first path length of a reservoir seepage channel according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
in this embodiment, the monitoring device obtains the first time t of injecting the first tracer through the timing device1And a second time t at which the first tracer is detected2Determining a first flow time period Δ t of a first tracer in a reservoir1Where Δ t is1＝t2-t1。
The monitoring device obtains a first flow time period delta t through pressure detection devices arranged at the bottom of the oil production well and the bottom of the water injection well1First pressure value P of bottom of inner oil production well1And a second pressure value P at the bottom of the water injection well2Determining a first flow time period Δ t1First pressure differential Δ P downhole of interconnected well groups1In which Δ P1＝P2-P1。
Determining a first path length Δ L of a first tracer in a reservoir percolation path according to the following equation1。
Wherein K is the permeability of the reservoir and mu is the viscosity of the fluid in the reservoir.
S302, determining a second path length of a reservoir seepage channel according to a second flow time period of a second tracer in a reservoir, a second pressure difference at the bottom of a communicated well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; the release time of the first tracer is earlier than that of the second tracer;
in this embodiment, the monitoring device obtains the third time t at which the second tracer is injected through the timing device3And a fourth instant t at which the second tracer is detected4Determining a second flow time period Δ t of a second tracer in the reservoir2Where Δ t is2＝t4-t3。
The monitoring device obtains a second flow time period delta t through pressure detection devices arranged at the bottom of the oil production well and the bottom of the water injection well2Third pressure value P of bottom of inner oil production well3And a fourth pressure value P of the bottom of the water injection well4Determining a second flow time period Δ t2Second pressure difference deltaP at bottom of internal communication well group2In which Δ P2＝P4-P3。
Determining a second path length Δ L of the second tracer in the reservoir percolation path according to the following equation2。
Wherein K is the permeability of the reservoir and mu is the viscosity of the fluid in the reservoir.
And S303, if the difference value between the second path length and the first path length is smaller than the preset difference value, sending first prompt information of a reservoir formation dominant seepage channel so that an operator can start profile control operation according to the first prompt information.
S303 of this embodiment is the same as S203 of the above embodiment, and reference is specifically made to the above embodiment, which is not described herein again.
S304, determining a third path length of a reservoir seepage channel according to a third flow time period of a third tracer in the reservoir, a third pressure difference communicated with the bottom of the well group in the third flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
after starting the profile control operation, the monitoring device continues to monitor the path length of the tracer in the seepage channel of the reservoir, specifically, the operator periodically puts the tracer into the water injection well for monitoring the flow parameters of the tracer in the new seepage channel of the reservoir, and before S304, the monitoring device obtains a fifth time t at which the third tracer is injected through the timing device5And a sixth time t at which the third tracer is detected6Determining a third flow time period Δ t of a third tracer in the reservoir3Wherein, Δ t3＝t6-t5。
The monitoring device respectively obtains a third flow time period delta t through pressure detection devices arranged at the bottom of the oil production well and the bottom of the water injection well3Fifth pressure value P of bottom of inner oil production well5And a sixth pressure value P of the bottom of the water injection well6Determining a third flow time period Δ t3Third pressure differential Δ P downhole of interconnected well groups3In which Δ P3＝P6-P5。
Determining a third path length Δ L of a third tracer in a reservoir percolation path according to the following equation3。
Wherein K is the permeability of the reservoir and mu is the viscosity of the fluid in the reservoir.
S305, judging whether the difference value between the third path length and the second path length is larger than a preset difference value or not, and if so, executing S306; if not, go to step S307.
S306, sending second prompt information that the profile control operation achieves the expected effect so that the operator can continue the water injection operation according to the second prompt information;
and S307, sending third prompt information that the profile control operation does not reach the expected effect so that the operator can continue the profile control operation according to the third prompt information.
The third path length determined by the monitoring device according to S304 is the path length corresponding to the tracer which is first put after the profile control operation, and is used for evaluating whether the profile control operation achieves the expected effect.
The specific evaluation strategy is as follows: by comparing the monitored second path length corresponding to the second tracer with the monitored third path length corresponding to the third tracer after the profile control operation when the water injection operation is switched to the profile control operation, if the difference between the third path length and the second path length is greater than the preset difference, the profile control operation achieves the expected effect, the plugging agent plugs the superior seepage passage, and certainly, a special condition is not excluded, namely, the third path length is smaller than the second path length.
The larger the difference between the third path length and the second path length is, the better the profile control effect of the profile control operation is, at the moment, the water injection operation can be continued, and the oil storage in a new seepage channel is developed, so that the recovery ratio of the recovery system on the new seepage channel is improved. In a new round of water injection operation, the monitoring device continues to execute S301-S303, and the change of the path length is monitored on a new seepage channel in real time to determine whether a new dominant seepage channel is formed.
Optionally, when the ratio of the absolute value of the difference between the third path length and the second path length to the second path length is greater than a preset ratio, for example, 5%, the monitoring device sends out second prompt information indicating that the profile control operation achieves the expected effect, so that the operator continues the water injection operation according to the second prompt information.
When the ratio of the absolute value of the difference between the third path length and the second path length to the second path length is less than or equal to a preset ratio, for example, 5%, the monitoring device sends out third prompt information that the profile control operation does not reach the expected effect, so that the operator can continue the profile control operation according to the third prompt information.
In the monitoring method of the seepage channel communicated with the well group, after the profile control operation is performed, the third path length of a third tracer on a new seepage channel is continuously monitored, the third path length and the second path length during first water injection are determined, and when the difference value between the third path length and the second path length is greater than a preset difference value, a monitoring device sends out second indication information that the profile control operation achieves an expected effect, so that an operator can continue water injection operation according to the second indication information; and when the difference value between the third path length and the second path length is smaller than or equal to the preset difference value, the monitoring device sends out third prompt information that the profile control operation does not reach the expected effect, so that the operator can continue the profile control operation according to the third prompt information. The method realizes the evaluation of the profile control operation, continues the profile control operation when the expected profile control effect is not achieved, and continues the water injection operation after a new seepage channel is determined to be formed, thereby ensuring that the recovery system has stable and higher recovery ratio.
Fig. 4 is a schematic structural diagram of a monitoring device for a seepage passage of a connected well group provided in the present invention, and as shown in fig. 4, a monitoring device 40 for a seepage passage of a connected well group provided in this embodiment includes:
a determining module 41, configured to, in a first water flooding operation, determine a first path length of a reservoir seepage channel according to a first flow time period of a first tracer in a reservoir, a first pressure difference at a bottom of a communication well group within the first flow time period, a permeability of the reservoir, and a viscosity of a fluid in the reservoir;
the determining module 41 is further configured to determine a second path length of the reservoir seepage passage according to a second flow time period of a second tracer in the reservoir, a second pressure difference at the bottom of a communication well group in the second flow time period, the permeability of the reservoir, and the viscosity of fluid in the reservoir; wherein the dosing time of the first tracer is earlier than the dosing time of the second tracer;
and the judging module 42 is configured to judge whether a difference between the second path length and the first path length is smaller than a preset difference, and if so, the prompting module 43 is configured to send first prompting information for forming a dominant seepage channel in the reservoir, so that an operator starts profile control operation according to the first prompting information.
Optionally, the determining module 41 is further configured to determine a first flow time period of the first tracer in the reservoir according to a first time instant when the first tracer is injected and a second time instant when the first tracer is detected;
the determining module 41 is further configured to determine a first pressure difference at the bottom of the communication well group in the first flow time period according to a first pressure value at the bottom of the production well and a second pressure value at the bottom of the water injection well in the first flow time period.
Optionally, the determining module 41 is further configured to determine a second flow time period of the second tracer in the reservoir according to a third time instant when the second tracer is injected and a fourth time instant when the second tracer is detected;
the determining module 41 is further configured to determine a second pressure difference at the bottom of the communication well group in the second flow time period according to a third pressure value at the bottom of the production well and a fourth pressure value at the bottom of the water injection well in the second flow time period.
Optionally, the first path length and the second path length are determined by using the following formulas:
wherein, Δ L is the path length, K is the permeability of the reservoir, Δ P is the pressure difference at the bottom of the communicating well group, Δ t is the flow time period of the tracer in the reservoir, and μ is the viscosity of the fluid in the reservoir.
Optionally, the determining module 41 is further configured to determine, after the profile control operation, a third path length of the reservoir seepage passage according to a third flow time period of a third tracer in the reservoir, a third pressure difference at a bottom of a communication well group in the third flow time period, the permeability of the reservoir, and the viscosity of the fluid in the reservoir;
the judging module 42 is further configured to judge whether a difference between the third path length and the second path length is greater than a preset difference, and if so, the prompting module 43 is further configured to send out second prompting information that the profile control operation achieves a desired effect, so that an operator continues the water injection operation according to the second prompting information.
Optionally, the determining module 41 is further configured to determine a third flow time period of the third tracer in the reservoir according to a fifth time instant when the third tracer is injected and a sixth time instant when the third tracer is detected;
the determining module 41 is further configured to determine a third pressure difference at the bottom of the communication well group in the third flow time period according to a fifth pressure value at the bottom of the production well and a sixth pressure value at the bottom of the water injection well in the third flow time period.
Optionally, the prompt module 43 is further configured to send a third prompt message that the profile control operation does not reach the expected effect if the difference between the third path length and the second path length is less than or equal to a preset difference, so that an operator continues the profile control operation according to the third prompt message.
The monitoring device provided in this embodiment may implement the technical solutions of the above method embodiments, and the implementation principles and technical effects thereof are similar, and are not described herein again.
Fig. 5 is a hardware structure diagram of a monitoring device for a seepage passage of a communication well group provided in the present invention, and as shown in fig. 5, the monitoring device 50 for a seepage passage of a communication well group provided in this embodiment includes:
a memory 51;
a processor 52; and
a computer program;
wherein the computer program is stored in the memory 51 and configured to be executed by the processor 52 to implement the technical solution of any one of the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
Alternatively, the memory 51 may be separate or integrated with the processor 52.
When the memory 51 is a device independent of the processor 52, the monitoring device 50 for the seepage path of the connected well group further comprises:
a bus 53 for connecting the memory 51 and the processor 52.
Embodiments of the present invention also provide a computer readable storage medium having a computer program stored thereon, where the computer program is executed by the processor 52 to implement the steps performed by the monitoring device for communicating the seepage paths of a well group in the above method embodiments.
The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard disk (Hard disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of monitoring a seepage flow path through a group of communicating wells, comprising:
in the first water injection operation, determining a first path length of a reservoir seepage channel according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
determining a second path length of the reservoir percolation path based on a second flow time period of a second tracer in the reservoir, a second pressure differential across the bottom of the well group within the second flow time period, a permeability of the reservoir, and a viscosity of a fluid within the reservoir; wherein the dosing time of the first tracer is earlier than the dosing time of the second tracer;
and judging whether the difference value between the second path length and the first path length is smaller than a preset difference value, if so, sending first prompt information of the reservoir forming a dominant seepage channel so that an operator starts profile control operation according to the first prompt information.
2. The method of claim 1, wherein prior to determining the first path length of the reservoir percolation path based on a first flow time period of the first tracer in the reservoir, a first pressure differential downhole of the communication well within the first flow time period, a permeability of the reservoir, and a viscosity of the fluid within the reservoir, further comprises:
determining a first flow time period of a first tracer in the reservoir based on a first time instant at which the first tracer is injected and a second time instant at which the first tracer is detected;
and determining a first pressure difference communicated with the bottom of the well group in the first flow time period according to a first pressure value at the bottom of the oil production well and a second pressure value at the bottom of the water injection well in the first flow time period.
3. The method of claim 1, wherein prior to determining the second path length of the reservoir percolation path based on a second flow time period of the second tracer in the reservoir, a second pressure differential across a bottom of the well block for the second flow time period, a permeability of the reservoir, and a viscosity of a fluid within the reservoir, further comprises:
determining a second flow period of the second tracer in the reservoir based on a third time instant at which the second tracer is injected and a fourth time instant at which the second tracer is detected;
and determining a second pressure difference of the bottom of the communication well group in the second flow time period according to a third pressure value of the bottom of the oil production well and a fourth pressure value of the bottom of the water injection well in the second flow time period.
4. A method according to any of claims 1-3, characterized by determining the first path length and the second path length using the following equations:
wherein, Δ L is the path length, K is the permeability of the reservoir, Δ P is the pressure difference at the bottom of the communicating well group, Δ t is the flow time period of the tracer in the reservoir, and μ is the viscosity of the fluid in the reservoir.
5. The method of claim 1, further comprising:
after the profile control operation, determining a third path length of the reservoir seepage passage according to a third flow time period of a third tracer in the reservoir, a third pressure difference communicated to the bottom of the well group within the third flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
and judging whether the difference value between the third path length and the second path length is greater than a preset difference value, if so, sending second prompt information that the profile control operation achieves the expected effect, so that an operator can continue the water injection operation according to the second prompt information.
6. The method of claim 5, wherein prior to determining the third path length of the reservoir percolation path based on a third flow time period for a third tracer in the reservoir, a third pressure differential downhole in a communication well block within the third flow time period, permeability of the reservoir, and viscosity of fluid within the reservoir, further comprises:
determining a third flow time period for a third tracer in the reservoir based on a fifth time instant at which the third tracer is injected and a sixth time instant at which the third tracer is detected;
and determining a third pressure difference communicated with the bottom of the well group in the third flow time period according to a fifth pressure value at the bottom of the oil production well and a sixth pressure value at the bottom of the water injection well in the third flow time period.
7. The method of claim 5, further comprising:
and if the difference value between the third path length and the second path length is smaller than or equal to a preset difference value, sending third prompt information that the profile control operation does not reach the expected effect, so that an operator can continue the profile control operation according to the third prompt information.
8. A monitoring device for a seepage passage communicating with a well group, comprising:
the determination module is used for determining a first path length of a reservoir seepage channel in a first water injection operation according to a first flow time period of a first tracer in a reservoir, a first pressure difference communicated with the bottom of a well group in the first flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir;
the determination module is further used for determining a second path length of the reservoir seepage channel according to a second flow time period of a second tracer in the reservoir, a second pressure difference at the bottom of a communication well group in the second flow time period, the permeability of the reservoir and the viscosity of fluid in the reservoir; wherein the dosing time of the first tracer is earlier than the dosing time of the second tracer;
and the judging module is used for judging whether the difference value between the second path length and the first path length is smaller than a preset difference value, if so, the prompting module is used for sending first prompting information of the reservoir formation dominant seepage channel so that an operator can start profile control operation according to the first prompting information.
9. A monitoring device for a seepage passage communicating with a well group, comprising:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-7.
10. A computer-readable storage medium, having stored thereon a computer program for execution by a processor to perform the method of any one of claims 1-7.
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