CN113008926A - Spontaneous imbibition fracturing fluid experimental system for tight reservoir rock - Google Patents
Spontaneous imbibition fracturing fluid experimental system for tight reservoir rock Download PDFInfo
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- CN113008926A CN113008926A CN202110247566.4A CN202110247566A CN113008926A CN 113008926 A CN113008926 A CN 113008926A CN 202110247566 A CN202110247566 A CN 202110247566A CN 113008926 A CN113008926 A CN 113008926A
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Abstract
The invention discloses a tight reservoir rock spontaneous imbibition fracturing fluid experimental system, which is applied to the technical field of tight reservoir rock spontaneous imbibition fracturing fluid and comprises the following steps: the device comprises a data receiving module, a nuclear magnetic resonance experiment testing module, a quality measuring module, a data sending module and a data processing platform. The invention can accurately test the initial spontaneous imbibition behavior by utilizing the suspension real-time weight measuring module, and can carry out later spontaneous imbibition measurement and the contribution of different sizes of pores in rocks to spontaneous imbibition by utilizing the nuclear magnetic resonance T2 spectrum test and taking out the weight measuring module; the weight measurement result is compared with a nuclear magnetic resonance T2 spectrum test for verification, so that the accuracy and reliability of the experiment test are ensured; the system can accurately and economically realize spontaneous imbibition experiments of the compact oil and gas reservoir in different fracturing fluids.
Description
Technical Field
The invention relates to the technical field of tight reservoir rock spontaneous imbibition fracturing fluid, in particular to a tight reservoir rock spontaneous imbibition fracturing fluid experimental system.
Background
The permeability of a compact oil and gas reservoir is less than 0.1mD, economic exploitation is difficult to realize in a traditional development mode, and the reservoir is usually improved by adopting a horizontal drilling and hydraulic fracturing technology so as to realize the purpose of economic exploitation. A large amount of water is used for large-scale fracturing transformation, however, the flow-back rate of the fracturing fluid is more than 50 percent after fracturing is completed, and a large amount of fracturing fluid enters a reservoir space. On-site engineering practice shows that the oil and gas resource recovery ratio of a part of tight reservoirs and the quality of fracturing fluid spontaneously seeping and sucking into the reservoir space are positively correlated. In the spontaneous imbibition process, the fracturing fluid gradually enters the pore space inside the reservoir from the macroscopic hydraulic fracturing crack due to the action of capillary force, including the microcracks and pore structures inside the reservoir, so that oil and gas resources stored in the internal space of the reservoir are replaced. The method has important significance for compact oil and gas storage by accurately representing the spontaneous imbibition behavior of the fracturing fluid in the reservoir space.
The size of the pore roar of the compact reservoir is mostly in the micro-nano level, the intrinsic permeability of a rock sample is extremely low, and meanwhile, the interior of the compact reservoir contains a large number of natural microcracks caused by hydraulic fracturing, so that the complexity and the heterogeneity of a pore space are caused. The flow conductivity of the micro-cracks is far greater than that of micro-nano pores, and fracturing fluid enters the micro-cracks and then gradually enters the micro-nano pores with smaller sizes at the initial spontaneous imbibition stage, so that the initial spontaneous imbibition speed is high and then gradually slows down, and the time required for achieving stability is long. In the prior art, the influences of the form, the heterogeneity and the like of a porous medium are not considered, the process that the fracturing fluid enters the pore space under the action of capillary force can be described by a classical Lucas-Washburn formula, and if the pore space is initially an oil phase, the formula needs to be corrected. Theoretical analysis shows that the morphological complexity and heterogeneity of the pore space lead to a high spontaneous imbibition rate in the early stage and a low spontaneous imbibition rate in the later stage. The total time of the spontaneous imbibition process of the compact reservoir becomes longer along with the reduction of the intrinsic permeability of a sample, a standard cylinder with the diameter of 25mm and the height of 50mm is usually adopted for testing compact reservoir rocks, the time required for achieving the stability of the spontaneous imbibition varies from one week to one month, and the spontaneous imbibition is characterized in that the imbibition rate is faster within the initial hours of the spontaneous imbibition and then becomes slower.
The existing research method for spontaneous imbibition experiments mainly comprises a T2 spectrum testing method and a weight measuring method by using a low-field nuclear magnetic resonance technology.
The method for testing the T2 spectrum by the low-field nuclear magnetic resonance technology can test the distribution rule of the hydrogen-containing fluid in the rock sample under the condition of no damage. As spontaneous imbibition is carried out, the fracturing fluid enters the sample to cause the change of a T2 spectrum in the nuclear magnetic resonance test of the sample, and the change of the spontaneous imbibition volume is obtained by calculating the change of the area surrounded by the T2 spectrum. However, in the T2 spectrum test of the saturated oil sample spontaneous imbibition fracturing fluid, it is difficult to accurately convert the amount of the spontaneous imbibition fracturing fluid due to the difficulty in accurately distinguishing the sample itself, the saturated oil and the spontaneous imbibition fracturing fluid.
The weight measuring method can be divided into a volume conversion measuring method, a suspension real-time weight measuring method and a taking-out wiping weight measuring method. Wherein the volume exchange algorithm uses a spontaneous imbibition test vial (Amott cell) to record the volume of fluid in the pores displaced by the imbibition fluid. The method is suitable for conventional petroleum reservoir cores. However, the permeability and porosity of the tight reservoir are extremely low, the volume of the oil phase displaced by spontaneous imbibition is extremely low, and the buoyancy of the displaced oil phase is difficult to spontaneously rise due to wall adsorption force when the volume is extremely low, so that errors are difficult to eliminate when a volume conversion measurement method is adopted to perform a spontaneous imbibition experiment of the tight reservoir. The suspension real-time weight measuring method can measure the change rule of the weight of the rock sample along with spontaneous imbibition in real time, is suitable for measuring the spontaneous imbibition mass change at the initial stage of the experiment of the spontaneous imbibition fracturing fluid of the compact rock, and is difficult to ensure the accuracy of the suspension real-time weight measuring method due to the error caused by continuous measurement when measuring for a long time. Although the electronic balance is also adopted for weighing in the taking-out and wiping-weighing method, the electronic balance does not need to work continuously, so that the accuracy of long-time measurement can be ensured. However, the sample is taken out of the imbibition liquid and wiped by the taking-out and weighing method, and the weight of the sample in the spontaneous imbibition process is difficult to record in real time like a hanging real-time weight measuring method.
Therefore, the experiment system for the spontaneous imbibition fracturing fluid of the tight reservoir rock can ensure continuous measurement of the weight change of the sample at the initial spontaneous imbibition stage and the accuracy in long-term measurement, and can be verified by multi-stage comparison, which is a technical problem to be solved urgently by technical staff in the field.
Disclosure of Invention
In view of the above, the invention provides a spontaneous imbibition fracturing fluid experimental system for tight reservoir rock.
In order to achieve the purpose, the invention adopts the following technical scheme:
a tight reservoir rock spontaneous imbibition fracturing fluid experimental system comprises:
the system comprises a data receiving module, a nuclear magnetic resonance experiment testing module, a quality measuring module, a data sending module and a data processing platform;
the data receiving module is used for receiving the experimental data of the nuclear magnetic resonance experimental testing module and the quality measuring module;
the nuclear magnetic resonance experiment testing module is connected with the first input end of the data receiving module and used for testing the change of a T2 spectrum in the spontaneous imbibition process of the tight reservoir rock and sending a T2 spectrum to the data receiving module;
the quality measuring module is connected with the second input end of the data receiving module and used for measuring the quality change of the tight reservoir rock in the spontaneous imbibition fracturing fluid experiment process and sending the quality change to the data receiving module;
the data sending module is connected with the output end of the data receiving module and used for sending the data received by the data receiving module to the data processing platform.
Preferably, the mass measuring module comprises one or more of a suspended weighing cell and a removed weighing cell; the suspension weighing unit is used for continuously recording the mass change of the tight reservoir rock in the first stage of the spontaneous imbibition fracturing fluid experiment; and the taking-out weighing unit is used for recording the mass change of the tight reservoir rock in the second stage of the spontaneous imbibition fracturing fluid experiment.
Preferably, the initial stage of the spontaneous imbibition process of the spontaneous imbibition fracturing fluid experiment is a first experiment period.
Preferably, the first experiment period is followed by a second experiment period of the spontaneous imbibition fracturing fluid experiment, and the duration of the second experiment period is a positive integral multiple of the duration of the first experiment period.
Preferably, in the duration of any one of the second experiment periods, the tight reservoir rock is taken out for weight measurement after wiping, and after the weight measurement, a T2 test is performed through a nuclear magnetic resonance experiment test module.
Preferably, the system further comprises a mode switching checking module, connected to the input end of the quality measuring module, and used for checking the weight measurement accuracy when the weight measurement mode is switched by the quality measuring module.
According to the technical scheme, compared with the prior art, the spontaneous imbibition fracturing fluid experimental system for the tight reservoir rock is provided, the initial spontaneous imbibition behavior can be accurately tested by using the suspension real-time weight measuring module, and the later spontaneous imbibition measurement and the contribution of pores with different sizes in the rock to spontaneous imbibition can be carried out by using the nuclear magnetic resonance T2 spectrum test and the weight measuring module taken out. The weight measurement result is compared with a nuclear magnetic resonance T2 spectrum test for verification, so that the accuracy and reliability of the experiment test are ensured; the system can accurately and economically realize spontaneous imbibition experiments of the compact oil and gas reservoir in different fracturing fluids.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a spontaneous imbibition fracturing fluid experiment system for tight reservoir rock according to the invention;
FIG. 2 is a schematic diagram of a mass measurement module;
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
Referring to the attached drawing 1, the embodiment discloses a tight reservoir rock spontaneous imbibition fracturing fluid experimental system, which comprises:
the system comprises a data receiving module, a nuclear magnetic resonance experiment testing module, a quality measuring module, a data sending module and a data processing platform;
the data receiving module is used for receiving the experimental data of the nuclear magnetic resonance experimental testing module and the quality measuring module;
the nuclear magnetic resonance experiment testing module is connected with the first input end of the data receiving module and used for testing the change of a T2 spectrum in the spontaneous imbibition process of the tight reservoir rock and sending the T2 spectrum to the data receiving module;
the quality measurement module is connected with the second input end of the data receiving module and used for measuring the quality change of the tight reservoir rock in the spontaneous imbibition fracturing fluid experiment process and sending the quality change to the data receiving module;
and the data sending module is connected with the output end of the data receiving module and is used for sending the data received by the data receiving module to the data processing platform.
In a particular embodiment, the mass measurement module includes one or more of a suspended weighing cell and a removed weighing cell; the suspension weighing unit is used for continuously recording the mass change of the tight reservoir rock in the first stage of the spontaneous imbibition fracturing fluid experiment; and taking out the weighing unit for recording the mass change of the tight reservoir rock in the second stage of the spontaneous imbibition fracturing fluid experiment.
In one embodiment, the initial stage of the spontaneous imbibition process of the spontaneous imbibition fracturing fluid experiment is the first experiment cycle.
In a specific embodiment, the first experiment period is followed by a second experiment period of the spontaneous imbibition fracturing fluid experiment, and the duration of the second experiment period is a positive integer multiple of the duration of the first experiment period, i.e., the second experiment period is N × the first experiment period, where N is a positive integer.
In a specific embodiment, in the duration of any one of the second experiment periods, the tight reservoir rock is taken out for weight measurement after wiping, and after the weight measurement of the tight reservoir rock, the T2 test is performed through the nuclear magnetic resonance experiment testing module.
In a specific embodiment, the system further comprises a mode switching checking module, connected to the input end of the quality measurement module, and used for checking the weighing accuracy when the quality measurement module switches the weighing mode.
In another specific embodiment, an experimental method for spontaneous imbibition fracturing fluid of tight reservoir rock is disclosed, which comprises the following steps:
1) preparing and treating a core sample: surface treatment: all the surfaces are unsealed/sealed annularly and the top surface is sealed, and the full-contact reverse spontaneous imbibition/forward spontaneous imbibition/single-surface contact spontaneous imbibition are respectively corresponding to the surfaces;
2) testing the dried sample T2 spectrum by a nuclear magnetic resonance tester;
3) the sample is saturated with oil and subjected to nuclear magnetic resonance T2 spectrum test;
4) placing the sample into a fracturing fluid prepared from deuterium water, recording the change of the sample quality in the initial (first experiment period) 4-hour spontaneous imbibition process by adopting a real-time weighing system, and adopting a suspension weighing method as a testing method;
5) during the second experimental period, the sample was taken out, and the non-woven fabric, which was also soaked in the fracturing fluid, was simultaneously taken out to wipe the residual fracturing fluid on the surface of the sample. Respectively carrying out a) electronic balance weighing; b) nuclear magnetic resonance testing of the dried sample T2 spectrum;
6) placing the sample back into the spontaneous imbibition fracturing fluid, and repeating the step 5 at intervals of 4 hours (the duration of the first experiment period);
7) according to different samples and spontaneous imbibition modes, the experiment is stopped when the weight of the sample is not changed any more, and the process lasts for 1 week to 1 month. The test time interval can be suitably extended as the experiment progresses.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention in a progressive manner. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a tight reservoir rock spontaneous imbibition fracturing fluid experimental system which characterized in that includes: the system comprises a data receiving module, a nuclear magnetic resonance experiment testing module, a quality measuring module, a data sending module and a data processing platform;
the data receiving module is used for receiving the experimental data of the nuclear magnetic resonance experimental testing module and the quality measuring module;
the nuclear magnetic resonance experiment testing module is connected with the first input end of the data receiving module and used for testing the change of a T2 spectrum in the spontaneous imbibition process of the tight reservoir rock and sending a T2 spectrum to the data receiving module;
the quality measuring module is connected with the second input end of the data receiving module and used for measuring the quality change of the tight reservoir rock in the spontaneous imbibition fracturing fluid experiment process and sending the quality change to the data receiving module;
the data sending module is connected with the output end of the data receiving module and used for sending the data received by the data receiving module to the data processing platform.
2. The tight reservoir rock spontaneous imbibition fracturing fluid experimental system of claim 1,
the mass measuring module comprises one or more of a suspension weighing unit and a take-out weighing unit;
the suspension weighing unit is used for continuously recording the mass change of the tight reservoir rock in the first stage of the spontaneous imbibition fracturing fluid experiment;
and the taking-out weighing unit is used for recording the mass change of the tight reservoir rock in the second stage of the spontaneous imbibition fracturing fluid experiment.
3. The tight reservoir rock spontaneous imbibition fracturing fluid experimental system of claim 2,
the initial stage of the spontaneous imbibition process of the spontaneous imbibition fracturing fluid experiment is a first experiment period.
4. The tight reservoir rock spontaneous imbibition fracturing fluid experimental system of claim 3,
and the first experiment period is followed by a second experiment period of the spontaneous imbibition fracturing fluid experiment, and the duration of the second experiment period is a positive integral multiple of the duration of the first experiment period.
5. The tight reservoir rock spontaneous imbibition fracturing fluid experimental system of claim 4,
and in the duration of any one of the second experiment periods, taking out the compact reservoir rock, performing weight measurement after wiping, and performing T2 test through a nuclear magnetic resonance experiment test module after the weight measurement of the compact reservoir rock.
6. The tight reservoir rock spontaneous imbibition fracturing fluid experimental system of any one of claims 1-5,
the device also comprises a mode switching checking module which is connected with the input end of the quality measuring module and used for checking the weight measuring accuracy when the weight measuring module switches the weight measuring mode.
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2021
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Application publication date: 20210622 |