CN112922574A - Fracturing fluid additive determination method and device for increasing energy of compact oil reservoir - Google Patents
Fracturing fluid additive determination method and device for increasing energy of compact oil reservoir Download PDFInfo
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Abstract
Provided herein are fracturing fluid additive determination methods and apparatus for increasing tight oil reservoir energy, wherein the methods include: preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives; obtaining test pressure parameters under the action of each group of simulated fracturing fluid according to the plurality of groups of reservoir rock slices and the plurality of groups of simulated fracturing fluids and a reservoir rock pressure conduction test method; calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid; the target additive is determined according to the energizing parameters under the action of each group of simulated fracturing fluid, the scheme is simple, the effect of increasing the reservoir energy by different additives can be effectively evaluated, and the target additive of the reservoir rock can be quickly and accurately determined.
Description
Technical Field
The patent refers to the field of 'investigating or analysing materials by determining their chemical or physical properties'.
Background
Compact oil reservoirs become an important successor of oil and gas resources in China, horizontal well multistage hydraulic fracturing is a main means of exploitation at present, but due to ultralow permeability and porosity, oil and gas seepage resistance is increased rapidly, so that formation pressure failure is rapid, formation energy supplement is difficult, and yield is reduced rapidly. To increase the production of tight oil, additives have been added to the fracturing fluid which increase the production of crude oil by imbibition displacement during the soak period and also increase the formation energy. Because the geological environments of different reservoirs are different, namely the permeability and the porosity of the reservoirs are different, the effect of the same fracturing fluid additive is also different, and the effect of different fracturing fluid additives on the reservoirs in the same geological environment is also different, a technical scheme capable of accurately selecting the fracturing fluid additive is urgently needed in the prior art in order to improve the accuracy of reservoir energy supplement.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method and an apparatus for determining a fracturing fluid additive for increasing energy of a tight oil reservoir, which can quickly and accurately determine a fracturing fluid additive having a good energizing effect on the tight oil reservoir.
In order to solve the technical problems, the specific technical scheme is as follows:
in one aspect, provided herein is a fracturing fluid additive determination method for increasing tight oil reservoir energy, the method comprising:
preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives;
obtaining test pressure parameters under the action of each group of simulated fracturing fluid according to the plurality of groups of reservoir rock slices and the plurality of groups of simulated fracturing fluids and a reservoir rock pressure conduction test method;
calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
and determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
In another aspect, there is also provided herein a fracturing fluid additive determination apparatus for increasing energy of a tight oil reservoir, the apparatus comprising:
the test sample preparation module is used for preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives;
the test parameter acquisition module is used for acquiring test pressure parameters under the action of each group of simulated fracturing fluid according to a reservoir rock pressure conduction test method and the multiple groups of the reservoir rock slices and the multiple groups of the simulated fracturing fluids;
the energizing parameter acquisition module is used for calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
and the target additive determining module is used for determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
By adopting the technical scheme, the fracturing fluid additive determining method and device for increasing the energy of the compact oil reservoir are characterized in that multiple groups of simulated fracturing fluids with different additives are configured, test parameters under the action of the multiple groups of simulated fracturing fluids are obtained according to a reservoir rock pressure conduction test method, so that different pressure conduction processes when the simulated fracturing fluids with different additives are applied to reservoir rock slices are obtained, and target additives, namely the additives with the best energy increasing effect, can be determined according to the obtained test parameters.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows a schematic representation of the steps of a fracturing fluid additive determination method for increasing tight oil reservoir energy in embodiments herein;
FIG. 2 shows a schematic representation of the acquisition steps of the test pressure parameters in the examples herein;
fig. 3 shows a schematic view of a core barrel in an embodiment herein;
FIG. 4 shows a schematic representation of a sample slice in an example herein;
FIG. 5 shows a schematic graph of the pressure profile during the test in the examples herein;
FIG. 6 is a graph showing pressure change curves during the test in the specific examples herein;
FIG. 7 shows a schematic diagram of the structure of a fracturing fluid additive determination device for increasing tight oil reservoir energy in embodiments herein;
fig. 8 shows a schematic structural diagram of an apparatus in an embodiment herein.
Description of the symbols of the drawings:
10. a reservoir rock core;
11. slicing the reservoir rock;
11a, slicing the rock sample;
11b, slicing the non-rock part;
100. a test sample preparation module;
200. a test parameter acquisition module;
300. an energization parameter acquisition module;
400. a target additive determination module;
802. a computer device;
804. a processor;
806. a memory;
808. a drive mechanism;
810. an input/output module;
812. an input device;
814. an output device;
816. a presentation device;
818. a graphical user interface;
820. a network interface;
822. a communication link;
824. a communication bus.
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 herein without making any creative effort, shall fall within the scope of protection.
It should be noted that the terms "first," "second," and the like in the description and claims herein and in the above-described 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 herein described are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
The compact oil reservoir is used as an important substitute of oil and gas resources, the exploitation research of the compact oil reservoir is more and more important, generally, the horizontal well multi-stage hydraulic fracturing is adopted for exploitation, but due to the ultralow permeability and porosity of the compact oil reservoir, the oil and gas seepage resistance is increased rapidly, so that the formation pressure failure is fast, the formation energy supplement is difficult, and the yield is reduced rapidly. In order to improve the yield of compact oil, additives are added into the fracturing fluid, the additives can improve the yield of crude oil through imbibition and displacement during the soaking period and can also increase the formation energy, and generally, the additives have limited increase on the formation energy and hardly have destructive effect on the formation, so that larger increase energy is required to improve the exploitation of the crude oil in the formation, but the increase degree of the formation energy of different additives on different geological conditions is different, and the increase energy of the additives on the formation is difficult to measure quantitatively.
In order to solve the above problems, embodiments herein provide a method for determining a fracturing fluid additive for increasing energy of a tight oil reservoir, which can quickly and accurately determine a fracturing fluid additive having a better effect on increasing energy of the tight oil reservoir, fig. 1 is a schematic step diagram of a method for determining a fracturing fluid additive for increasing energy of a tight oil reservoir provided in embodiments herein, and the present specification provides the method operation steps as described in the embodiments or the flowchart, but may include more or less operation steps based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual system or apparatus product executes, it can execute sequentially or in parallel according to the method shown in the embodiment or the figures. Specifically, as shown in fig. 1, the method may include:
s101: preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives;
s102: obtaining test pressure parameters under the action of each group of simulated fracturing fluid according to the plurality of groups of reservoir rock slices and the plurality of groups of simulated fracturing fluids and a reservoir rock pressure conduction test method;
s103: calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
s104: and determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
The method can be understood that the rock porosity and permeability of the same oil reservoir are similar, multiple groups of reservoir rock slices prepared from the same oil reservoir can be used as experimental samples to ensure the accuracy of the test, then the simulated fracturing fluids with different additives are subjected to a pressure conduction test to obtain test pressure parameters under the action of each group of simulated fracturing fluids, and then the energizing parameters under the action of each group of simulated fracturing fluids are calculated according to the test pressure parameters, so that the target additives can be further determined.
In order to avoid the influence on the test result caused by the mutation of the rock porosity and the permeability in the same reservoir, a plurality of groups of slices divided by the rock core of the same reservoir can be selected, so that the geological conditions among the plurality of groups of slices can be improved to improve the test accuracy, further, before the test, the difference between the porosity and the permeability among different slices can be judged, and when the difference is within the preset difference range, the porosity and the permeability among the plurality of groups of slices are close to each other, so that the test can be carried out.
In an embodiment of the present specification, the preparing a plurality of sets of the reservoir rock slices of the same oil reservoir may include the following steps:
obtaining a target core of a target oil reservoir, and performing oil washing and drying treatment;
preparing the target rock core into a rubber barrel;
and obtaining a plurality of groups of reservoir rock slices according to the prepared rubber barrel.
Wherein the target oil reservoir may be a formation in the production well at the location of the reservoir, such as tight sandstone or tight carbonate, and in preferred embodiments, the target oil reservoir may be selected to have a permeability of matrix at the overburden pressure of less than 0.1 x 10-3μm2The tight sandstone and the tight carbonate rock are not subjected to petroleum aggregation formed by large-scale long-distance migration (near-source aggregation), so that the pore areas of reservoir rock can be ensured to be similar and are formed slowly by deposition causes, and therefore, the pore parameters of slices at the positions of similar reservoirs are ensured to be closer, and the experiment comparison is facilitated. As shown in fig. 3, a glue barrel may be made of epoxy AB glue, a target core is placed in the glue barrel, the target core is a reservoir rock core 10, after the glue barrel and the target core are completely glued and combined, a core slice, i.e., a plurality of sets of reservoir rock slices, is obtained by linear cutting, as shown in fig. 4, a schematic diagram of the reservoir rock slices 11, the peripheries of slice rock samples 11a are all provided with non-rock parts 11b such as epoxy resin, and core slices may also be obtained by other cutting methods, wherein the thicknesses of the plurality of sets of reservoir rock slices 11 are the same, and the specific thicknesses are set according to actual conditions, which is not limited in this specification. The reservoir rock slice 11 is obtained by cutting the target core in the rubber barrel, so that when the reservoir rock slice 11 is subjected to a pressure conduction test in the subsequent process, the slice can be fixedly sealed and the like through the non-rock part 11b of the slice at the periphery of the slice, damage to the slice is avoided, and the accuracy of the test result is further improved.
Due to the ultralow porosity and permeability of the compact oil reservoir, in actual work, the production amount and the production rate of crude oil are greatly restricted, so that a target additive with a better energizing effect on a target oil reservoir can be selected through the steps, the original production amount and the original production rate of the oil reservoir can be improved, and in other embodiments, the steps can also be applied to other oil reservoirs needing fracturing fluid to improve the yield of crude oil, and the description does not limit the steps.
The simulated fracturing fluid can extract crude oil in pores or fractures in a seepage and suction replacement mode so as to fill the space of the original pores and fractures, and the initial simulated fracturing fluid is artificial formation water, namely the fluid which is prepared according to the components of the formation water in a reservoir and mainly comprises the mineralization degree and the ion type of the formation water. However, in the process of production, continuous production of crude oil combines with ultra-low permeability and porosity, so that the oil-gas seepage resistance can be increased rapidly, and the imbibition displacement capability of the original fracturing fluid on the crude oil in a reservoir is also reduced gradually, so that an additive needs to be added into the fracturing fluid to increase the imbibition capability of the fracturing fluid, and the additive can also have other effects, such as improvement of the stability effect, thickening effect, supporting effect, sterilization effect, resistance reduction effect and the like of the fracturing fluid, so that the additive can be a cleanup additive, a thickener, a proppant, a bactericide, a drag reducer and the like, and specific components are not limited in this specification.
Thus, preparing multiple sets of simulated fracturing fluids configured with different additives may further include the steps of:
obtaining a plurality of groups of additives of different types;
adding a plurality of groups of additives of different types into simulated formation water to form a plurality of groups of simulated fracturing fluids; and/or;
obtaining a plurality of groups of additives with different concentrations;
and adding a plurality of groups of additives with different concentrations into the simulated formation water to form a plurality of groups of simulated fracturing fluids.
In actual work, a plurality of groups of additives can be arranged according to an equal difference concentration mode, so that a plurality of groups of simulated fracturing fluids are obtained, a plurality of groups of additive concentrations can be arranged according to a conventional use habit, in order to further reduce cost, the addition proportion of the additives can be 0.1-0.5 wt.%, and the energy increasing effects of the additives with different concentrations and types on a compact oil reservoir can be compared, so that the additive with the best energy increasing effect can be selected.
The reservoir rock pressure conduction test method is to obtain the time for the slice to reach equilibrium under different pressure gradients through a test method, and can be realized through a pressure conduction instrument, wherein the pressure conduction instrument can be a conventionally used device, and is not limited in the embodiment of the specification.
In the embodiment of the present specification, the test pressure parameters include an upstream pressure initial value, a downstream pressure initial value, a pressure balance value, and a pressure balance time, that is, parameters generated in a pressure conduction simulation process performed by a pressure conduction instrument, wherein a plurality of sets of reservoir rock slices correspond to a plurality of sets of simulated fracturing fluids, so that each set of reservoir rock slice corresponds to a set of simulated fracturing fluid, and the compaction effect of different additives on a reservoir can be obtained by comparing the test results of each type of reservoir rock slice.
Specifically, as shown in fig. 2, the specific steps of the test method may be:
for each set of reservoir rock slices:
s201: vacuumizing the reservoir rock slice and pumping in simulated formation water, wherein the simulated formation water has the same component as real formation water;
s202: placing the reservoir rock slices in a pressure conduction instrument, and performing bound water treatment on the downstream of the reservoir rock slices to reach a bound water stage;
s203: setting the downstream pressure of the reservoir rock slice to a downstream pressure initial value, and vacuumizing the upstream of the reservoir rock slice;
s204: pumping simulated fracturing fluid to the upstream of the reservoir rock slice to an upstream initial pressure value, wherein different reservoir rock slices correspond to the simulated fracturing fluid of different additives;
s205: and recording the pressure balance time and the pressure balance value when the upstream and downstream pressures of the reservoir rock slice reach balance.
The method comprises the following steps of firstly carrying out vacuum treatment on a reservoir rock slice, optionally placing the slice into a high-pressure saturation container, vacuumizing for 24 hours, and improving the accuracy of the test in order to extract air in pores and cracks inside the reservoir rock slice. And then pumping in simulated formation water, so as to simulate a real formation environment, wherein the actual position of the slice in the reservoir is at the underground depth, and the pressure in pores and fractures is greater than a conventional pressure value, so that the real formation pressure needs to be simulated in a high-pressure saturated state when the simulated formation water is pumped in, and in view of the fact that the thickness of the slice is small (such as 0.5cm-1.5cm) and the pressure and the fluid pressure of a surrounding rock which is far away from the underground depth are large, the pressure value of high-pressure saturation can be half of the actual pressure of the reservoir, so that the pore structure in the rock slice of the reservoir is prevented from being damaged by too high pressure, and in addition, the pressure value of high-pressure saturation can also be other preset values, as long as the pore structure in the slice is not damaged, and the preset value is not limited in.
And (2) placing the reservoir rock slice which is finished by pumping the simulated formation water into a holder of a pressure conductivity meter, specifically, fixing a non-rock part at the periphery of the reservoir rock slice by the holder, and forming a sealed space at the upstream and the downstream of the slice, wherein the upstream and the downstream refer to two sections of the slice, the upstream can be one side of the reservoir rock close to a production well, pumping the simulated fracturing fluid with additives into the side of the slice through the production well, and the downstream refers to one side of the reservoir rock far away from the production well, namely the distant view reservoir rock, and gradually producing crude oil stored in the distant view reservoir rock by the seepage and suction displacement of the simulated fracturing fluid pumped at the upstream.
In order to further simulate a real formation environment, bound water treatment can be carried out on the reservoir rock slices, and non-free water in reservoir pores can be simulated, optionally, since the oil reservoir is involved in the specification, an oil phase must be used, and the crude oil has complex components and cannot achieve a better bound effect, the bound water can be made of kerosene, and can be achieved through constant-temperature displacement, and since the pore volume of the compact core is smaller, the volume of the displacement pore volume can be determined through the volume change of a pumping system, wherein the pore volume of a preset number can be displaced at constant pressure, in the embodiment of the specification, 10 pore volumes can be displaced at constant pressure, so that a real bound water stage of the formation can be achieved, in the specification, the coal oil bound water can be made downstream of the reservoir rock slices, so that the real environment of a distant view reservoir can be simulated, in some other embodiments, the bound water treatment can be carried out on the upper stream and the lower stream of the slice, so that the bound water exists in the slice, and the slice is closer to the real environment of the slice.
After the reservoir rock slice is simulated into a real reservoir environment, a pressure conduction test can be carried out, and specifically, fracturing fluid with additives can be pumped in through the upstream of the slice, so that the time for the upstream and the downstream of the slice to reach balance and other related parameters are analyzed, and the effect of the fracturing fluid on slice energy increment is obtained.
Specifically, the upstream of the slice is subjected to vacuum treatment, so that liquid (such as kerosene) in the upstream step is pumped out completely, the liquid is ensured to be in complete contact with the surface of the reservoir rock slice in the subsequent step, and the accuracy of a measurement result is further ensured. The downstream pressure of the reservoir rock slice can be reduced to a downstream pressure initial value, the downstream pressure initial value can be a module pore pressure, namely the pore pressure in the simulated distant reservoir rock, the downstream pressure initial value can be set according to actual conditions, for example, according to the bearing pressure of the slice, performance parameters of a pressure conductivity meter or common parameters of an operator, and the like, it needs to be noted that the downstream pressure initial value is greater than zero, so that air can be prevented from entering the downstream to influence an experimental result, and meanwhile, the downstream pressure initial value is also smaller than the bearing pressure of the slice.
Further, pumping a simulated fracturing fluid with additives upstream of the reservoir rock slice to an upstream initial pressure value, wherein the upstream initial pressure value can be understood as the energizing of the pores in the reservoir rock slice by the simulated fracturing fluid. In addition, the upstream initial pressure value may be set according to actual conditions, but should not exceed the bearing pressure of the slice, and should be greater than the downstream initial pressure value, so that the pressure of the upstream simulated fracturing fluid is transmitted to the fluid in the downstream mesopores, and further pressure balance is gradually achieved, as shown in fig. 5, which is a schematic diagram of a pressure change curve of the upstream and downstream of the reservoir rock slice in a pressure transmission test. After pressure equalization, the corresponding parameters can be obtained: initial value P of upstream pressure2Downstream pressure initial value P0Pressure equilibrium value P1And a pressure equalization time T.
In the embodiment of the specification, the energization parameters include an energization reference amplitude and an energization reference speed; the energization reference amplitude is used for representing the increase amplitude of the reservoir pressure after the bottom hole pressure is reduced by a unit value; the energization reference speed is used to represent a relative increase speed of the energization reference amplitude. And reflecting the energizing effect of the fracturing fluid on the reservoir rock through the energizing reference amplitude and the energizing reference speed.
Optionally, the energizing reference amplitude and the energizing reference speed calculation formula are respectively:
wherein, Delta E is the energizing reference amplitude, Delta F is the energizing reference speed, P2Indicating an initial value of the upstream pressure, P1Denotes the pressure value after equilibrium, P0Indicating the initial value of the downstream pressure, T indicating the balance time period, and n being a preset adjusting parameter. The energizing strength of different additives can be compared simply and rapidly through quantitative calculation of the energizing parameters, so that the additive with higher energizing strength is obtained.
On the basis of obtaining a specific test pressure parameter, an energy increase reference amplitude and an energy increase reference speed can be obtained through the formulas (1) and (2), wherein n in the formula (2) is set according to an actual calculation condition, because the step is a parameter obtained by performing pressure conduction simulation on a reservoir rock slice, and only a single direction of a single slice is subjected to diffusion, fracturing fluid can diffuse to more directions in rocks in an actual reservoir, the energy increase effect on the reservoir rock can be more dispersed, the pressure balance time is relatively faster, so that the corresponding parameter obtained through the test, such as the balance time, is relatively slower, the deviation value of the finally obtained energy increase reference speed and the real reference speed is larger, and because the parameter obtained through the test is relatively slower than the real reference speedIn order to reduce the influence of the balance time on the real result and reduce the influence of the difference of the balance time on the real result, in the embodiment of the present specification, n is 2, and formula (2) is specifically as follows
The energy-increasing reference speed closer to the real can be obtained through the above formula, and in some other embodiments, the value of n may also be set according to actual conditions, such as 1, 3, 4, and the like, which is not limited in this specification.
In one embodiment, 2% KCl is used to prepare 0.1% by weight of a type a fracturing fluid additive; selecting a rock core of a certain compact oil reservoir in China, wherein the matrix permeability is 0.04 mu D, the diameter is 2.54 cm, and the length is 4.2 cm, washing oil of the rock core is dried to prepare a rubber barrel, the rubber barrel is cut into slices with the thickness of 0.8cm, the slices are vacuumized, high-pressure saturated formation water is put into a rock core holder of a pressure conduction instrument after being vacuumized, kerosene is used for displacing 10 pore volumes at a constant pressure of 0.6MPa at the downstream, a pump is stopped, an upstream valve is opened for vacuumizing, a downstream pressure is reduced to 0.08MPa, then the valve is closed, a simulated fracturing fluid is pumped to 0.6MPa at the upstream, the change of the upstream pressure and the downstream pressure along with time is recorded, and the energy increasing amplitude and the energy increasing speed are calculated based on the initial upstream pressure, the downstream pressure after balance.
The calculation results are shown in fig. 6 and table 1: the initial upstream pressure value is 0.57MPa, the initial downstream pressure is 0.08MPa, the equilibrium pressure is 0.28MPa, the equilibrium time is 15min, the energization reference amplitude of the additive of the A-type fracturing fluid is 1.59, and the energization reference speed is 0.11.
TABLE 1 test chart
Correspondingly, on the basis of obtaining a set of energization parameters, the same pressure conduction test is carried out on other reservoir rock slices to obtain a plurality of sets of energization parameters, it should be noted that relevant parameters and processes in the test process are consistent, for example, an upstream pressure initial value can be setP2And a downstream pressure initial value P0And (4) recording the pressure value and the balance time after the balance is not changed, thereby obtaining the energizing effect of the fracturing fluid corresponding to different additives on the same reservoir rock slice.
On the basis of obtaining multiple groups of energizing parameters, the additive which can best energize reservoir rock can be determined, and the specific steps can be as follows:
calculating evaluation scores under the action of each group of simulated fracturing fluid according to the parameter values of the energizing parameters under the action of each group of simulated fracturing fluid and a preset weight proportion;
and determining the additive corresponding to the simulated fracturing fluid with the highest evaluation score as a target additive according to the evaluation scores of the groups of simulated fracturing fluids.
It can be understood that the actual energization effects of different energization parameters are compared by setting the weight proportional relationship between the energization reference amplitude and the energization reference speed, for example, the calculation weights of the energization reference amplitude and the energization reference speed can be set as m and n respectively, wherein m + n is 1, the calculation formula of the evaluation score is P-m-delta E + n-delta F, wherein P is the evaluation score, thus, by combining multiple groups of energizing parameters obtained by calculation through the formula, multiple groups of evaluation scores can be obtained, the additive corresponding to the simulated fracturing fluid with the highest evaluation score is selected as the target additive, preferably, m is more than n, in a specific working condition, the energy increasing effect of reservoir rock can be reflected most, the larger the amplitude is, the higher the efficiency is when crude oil is extracted such as imbibition displacement, and the like, and meanwhile, the energy can be covered in a distant view reservoir region by the high energy increasing amplitude.
In some embodiments, the energizing reference amplitudes may be prioritized, and in making the target additive determination, the energizing reference amplitudes in the multiple sets of data may be compared first, where a larger energizing reference amplitude is a preferred combination, and the simulated fracturing fluid corresponding to a larger value of the energizing reference velocity is selected as the target fracturing fluid in the preferred combination, and accordingly, the additive in the target fracturing fluid is the target additive. The determination of the target additive may be performed in other ways, and is not limited in this specification.
In order to further improve the energizing effect of the target additive, a plurality of groups of additive concentrations with smaller equal-difference intervals can be continuously set by taking the target additive as a center, so that a plurality of groups of simulated fracturing fluids are obtained, and then the more accurate target additive is obtained through continuous comparison of the test and the calculation steps.
The embodiment of the specification provides a fracturing fluid additive determining method for increasing energy of a compact oil reservoir, multiple groups of simulated fracturing fluids with different additives are configured, multiple groups of test parameters are obtained according to a reservoir rock pressure conduction test method, different pressure conduction processes of the simulated fracturing fluids with different additives are obtained when the reservoir rock slices are applied with the different additives, and target additives, namely the additives with the best energy increasing effect, can be determined according to the obtained test parameters.
Based on the same inventive concept, the embodiments of the present specification further provide a fracturing fluid additive determination device for increasing energy of tight oil reservoirs, as shown in fig. 7, the device includes:
the test sample preparation module 100 is used for preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids configured with different additives;
the test parameter acquisition module 200 is used for acquiring test pressure parameters under the action of each group of simulated fracturing fluid according to a reservoir rock pressure conduction test method and according to the plurality of groups of reservoir rock slices and the plurality of groups of simulated fracturing fluids;
the energizing parameter obtaining module 300 is used for calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
and the target additive determining module 400 is used for determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
The beneficial effects obtained by the device are consistent with those obtained by the method, and are not described herein again.
Based on the same inventive concept, the above steps S102-S104 can be implemented for a pressure conduction meter and its host device, so as shown in fig. 8, for a computer device provided in the embodiments herein, the computer device 802 can include one or more processors 804, such as one or more Central Processing Units (CPUs), each of which can implement one or more hardware threads. The computer device 802 may also include any memory 806 for storing any kind of information, such as code, settings, data, etc. For example, and without limitation, memory 806 may include any one or more of the following in combination: any type of RAM, any type of ROM, flash memory devices, hard disks, optical disks, etc. More generally, any memory may use any technology to store information. Further, any memory may provide volatile or non-volatile retention of information. Further, any memory may represent fixed or removable components of computer device 802. In one case, when the processor 804 executes the associated instructions, which are stored in any memory or combination of memories, the computer device 802 can perform any of the operations of the associated instructions. The computer device 802 also includes one or more drive mechanisms 808, such as a hard disk drive mechanism, an optical disk drive mechanism, etc., for interacting with any memory.
Corresponding to the methods in fig. 1-2, the embodiments herein also provide a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, performs the steps of the above-described method.
Embodiments herein also provide computer readable instructions, wherein when executed by a processor, a program thereof causes the processor to perform the method as shown in fig. 1-2.
It should be understood that, in various embodiments herein, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments herein.
It should also be understood that, in the embodiments herein, the term "and/or" is only one kind of association relation describing an associated object, meaning that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided herein, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments herein.
In addition, functional units in the embodiments herein may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present invention may be implemented in a form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The principles and embodiments of this document are explained herein using specific examples, which are presented only to aid in understanding the methods and their core concepts; meanwhile, for the general technical personnel in the field, according to the idea of this document, there may be changes in the concrete implementation and the application scope, in summary, this description should not be understood as the limitation of this document.
Claims (10)
1. A fracturing fluid additive determination method for increasing tight oil reservoir energy, the method comprising:
preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives;
obtaining test pressure parameters under the action of each group of simulated fracturing fluid according to the plurality of groups of reservoir rock slices and the plurality of groups of simulated fracturing fluids and a reservoir rock pressure conduction test method;
calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
and determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
2. The method of claim 1, wherein the test pressure parameters comprise an upstream pressure initial value, a downstream pressure initial value, a pressure balance value and a pressure balance time, and wherein obtaining the test pressure parameters under the action of each set of simulated fracturing fluid according to the reservoir rock pressure conduction test method based on the plurality of sets of reservoir rock slices and the plurality of sets of simulated fracturing fluids further comprises:
for each set of reservoir rock slices:
vacuumizing the reservoir rock slice and pumping in simulated formation water, wherein the simulated formation water has the same component as real formation water;
placing the reservoir rock slices in a pressure conduction instrument, and performing bound water treatment on the downstream of the reservoir rock slices to reach a bound water stage;
setting the downstream pressure of the reservoir rock slice to a downstream pressure initial value, and vacuumizing the upstream of the reservoir rock slice;
pumping simulated fracturing fluid to the upstream of the reservoir rock slice to an upstream initial pressure value, wherein different reservoir rock slices correspond to the simulated fracturing fluid of different additives;
and recording the pressure balance time and the pressure balance value when the upstream and downstream pressures of the reservoir rock slice reach balance.
3. The method of claim 1, wherein preparing a plurality of sets of the reservoir rock slices for the same oil reservoir further comprises:
obtaining a target core of a target oil reservoir, and performing oil washing and drying treatment;
preparing the target rock core into a rubber barrel;
and obtaining a plurality of groups of reservoir rock slices according to the prepared rubber barrel.
4. The method of claim 3, wherein the lithology of the target oil reservoir is tight sandstone or tight carbonate rock.
5. The method of claim 1, wherein preparing a plurality of sets of simulated fracturing fluids configured with different additives further comprises:
obtaining a plurality of groups of additives of different types;
adding a plurality of groups of additives of different types into simulated formation water to form a plurality of groups of simulated fracturing fluids; and/or;
obtaining a plurality of groups of additives with different concentrations;
and adding a plurality of groups of additives with different concentrations into the simulated formation water to form a plurality of groups of simulated fracturing fluids.
6. The method of claim 1, wherein the energization parameters include an energization reference amplitude and an energization reference speed;
the energization reference amplitude is used for representing the increase amplitude of the reservoir pressure after the bottom hole pressure is reduced by a unit value;
the energization reference speed is used to represent a relative increase speed of the energization reference amplitude.
7. The method of claim 6,
the energizing reference amplitude and the energizing reference speed are calculated according to the following formula:
wherein, Delta E is the energizing reference amplitude, Delta F is the energizing reference speed, P2Indicating an initial value of the upstream pressure, P1Denotes the pressure value after equilibrium, P0Indicating the initial value of the downstream pressure, T indicating the balance time period, and n being a preset adjusting parameter.
8. The method of claim 6, wherein determining a target additive based on the energization parameters for each set of simulated fracturing fluids further comprises:
calculating evaluation scores under the action of each group of simulated fracturing fluid according to the parameter values of the energizing parameters under the action of each group of simulated fracturing fluid and a preset weight proportion;
and determining the additive corresponding to the simulated fracturing fluid with the highest evaluation score as a target additive according to the evaluation scores of the groups of simulated fracturing fluids.
9. The method of claim 8, wherein the energizing reference amplitude is weighted more heavily than the energizing reference speed.
10. A fracturing fluid additive determination device for increasing energy in a tight oil reservoir, the device comprising:
the test sample preparation module is used for preparing a plurality of groups of reservoir rock slices of the same oil reservoir and a plurality of groups of simulated fracturing fluids with different additives;
the test parameter acquisition module is used for acquiring test pressure parameters under the action of each group of simulated fracturing fluid according to a reservoir rock pressure conduction test method and the multiple groups of the reservoir rock slices and the multiple groups of the simulated fracturing fluids;
the energizing parameter acquisition module is used for calculating and obtaining energizing parameters under the action of each group of simulated fracturing fluid according to the test pressure parameters under the action of each group of simulated fracturing fluid;
and the target additive determining module is used for determining the target additive according to the energizing parameters under the action of each group of simulated fracturing fluid.
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