CN112112634B - Method for evaluating fracturing interference by using tracer and environment-friendly application thereof - Google Patents
Method for evaluating fracturing interference by using tracer and environment-friendly application thereof Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000003044 adaptive effect Effects 0.000 claims abstract description 4
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- 239000007864 aqueous solution Substances 0.000 claims description 2
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- 239000008346 aqueous phase Substances 0.000 description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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Abstract
The invention belongs to the technical field of energy efficient environment-friendly development, and particularly relates to a method for evaluating fracturing interference, which comprises the following steps: the first step is as follows: selecting suitable tracers, including selecting various tracers which are adaptive to different solution environments, wherein the various tracers are only dissolved in corresponding solutions; the second step is that: injecting the tracer in the first step into the stratum along with the fracturing fluid, wherein the tracer injected into each section of the stratum has uniqueness; the third step: sampling produced liquid of the fracturing production well in the second step; the fourth step: and monitoring the data of the types and concentrations of the tracers contained in the sample in the third step, carrying out non-dimensionalization treatment on the data, and then judging and distinguishing the fracturing interference by applying a formula comprising comprehensive evaluation of the solubility of the tracers and combining the interference reasons.
Description
Technical Field
The invention belongs to the technical field of efficient and environment-friendly development of energy, and particularly relates to a method for evaluating fracturing interference.
Background
The environment-friendly and efficient development of oil gas has great significance in the field of energy development, is the trend of energy development and the inevitable requirement of national energy development, has great defects in the development of oil gas energy, particularly the development of compact oil gas, and can cause the fracturing interference of production wells in the same well group and the same block when the fracturing transformation is carried out on oil gas reservoirs in the same block in the process of the compact oil gas development. Theoretically, under the condition that the reservoir reconstruction scale is fixed and the reservoir anisotropy of a reconstruction well is small, the smaller the distance between a production well and the reconstruction well is, the larger the interference degree is. However, as the compact oil and gas reservoirs are mostly reservoirs with large anisotropy, the fracturing modification scale of each well is different, the influence of the fracturing interference on the production wells is good or bad, and at present, the method has no more intensive research on the aspect. At present, whether the production well is disturbed by fracturing or the production pressure of the production well is changed violently during normal production is judged, the method has the advantages of high randomness, large error and poor operability in the judgment process, and cannot provide reliable basis for large-scale reconstruction of fracturing.
Disclosure of Invention
In order to solve one of the above problems, the present invention provides a method for evaluating fracture disturbance using a tracer, comprising the steps of:
the first step is as follows: selecting suitable tracers, including selecting various tracers which are adaptive to different solution environments, wherein the various tracers are only dissolved in corresponding solutions;
the second step is that: injecting the tracer in the first step into the stratum along with the fracturing fluid, wherein the tracer injected into each section of the stratum has uniqueness;
the third step: sampling produced liquid of the fracturing production well in the second step;
the fourth step: and monitoring the data of the types and concentrations of the tracers contained in the samples in the third step, carrying out non-dimensionalization treatment on the data, and then applying a formula comprising comprehensive evaluation of the solubility of the tracers to judge and distinguish the fracture interference.
Further, the method also comprises the step of judging and distinguishing the fracture interference by combining classification calculation of the interference reasons.
Further, the different solution environments include an aqueous solution environment and an oil solution environment, and the various tracers include a water-soluble tracer and an oil-soluble tracer.
Further, the water-soluble tracer is a trace substance tracer.
Further, the oil-soluble tracer comprises an oil-soluble substance, and the oil-soluble substance is coated on the proppant to form the coated proppant.
Further, the method comprises the steps of injecting an aqueous phase chemical tracer into the stratum along with the hydraulic fracturing fluid and injecting an oil phase chemical tracer into the stratum along with the propping agent.
Furthermore, the method also comprises the steps of calibrating the fracturing fluid and calibrating the proppant.
Further, the formula comprises comprehensive operation of dimensionless data of the concentration of the tracer and the bottom hole distance, and the formula comprises a comprehensive evaluation formula of the water-soluble tracer and a comprehensive evaluation formula of the oil-soluble tracer.
Further, the comprehensive evaluation formula of the water-soluble tracer is as follows
C11 and C12. C1a in the formula are numerical values obtained by recording the monitoring concentration of the water-soluble tracer in the fracturing production P well and performing dimensionless treatment, wherein a is the type of the water-soluble tracer, and Di is the projection distance from the injection position of the water-soluble tracer to the bottom of the fracturing production well;
the oil-soluble tracer agent has a comprehensive evaluation formula of
In the formula, Y11 and Y12.. Y1b are numerical values obtained after carrying out dimensionless treatment for recording the monitored concentration of the oil-soluble tracer in the fracturing production P well, b is the type of the oil-soluble tracer, and Di is the projection distance from the injection position of the oil-soluble tracer to the bottom of the fracturing production well.
Further, the distinguishing and judging of the filter pressing interference also comprises the following process that the reasons of the interference include at least three types, wherein the first type is reservoir pressure transmission waves, the second type is that fracturing fluid flees to a production well, and the third type is that the fracturing fluid and proppant flee to the production well, and the weight indexes of the three types are delta respectively1、δ2、δ3；
Secondly, through an interference coefficient calculation formula
R1＝δ1+δ2·FSC+δ3·FYC
Sequentially calculating fracture interference coefficients of fracture production wells P1, P2 and P3.. Pn;
and finally, performing comparative analysis on the fracture interference coefficients of the fracturing production wells P1, P2 and P3.
Compared with the prior art, the invention has the following effects:
the invention provides an evaluation method for quantitatively evaluating the fracturing interference degree of a production well by combining comprehensive evaluation of a tracer with calculation of three types of reasons of fracturing interference of the fracturing production well, and provides a basis for optimizing well spacing and fracturing modification scale, wherein the three specific reasons comprise that the first type is reservoir pressure conduction waves; the second type is that the fracturing fluid is carried to a production well; and the third type is that the fracturing fluid and the propping agent are both fleed to a production well, and the three reasons and dimensionless data of a tracer comprehensive evaluation formula are comprehensively calculated through an interference coefficient calculation formula to obtain an accurate result of quantitatively evaluating the interference degree of the tracer to the production well.
Drawings
FIG. 1: in the embodiment of the invention, a fracturing interference situation graph appears in 16 production wells;
FIG. 2: the situation of an oil-water phase tracer is found in a 6006 well in the embodiment of the invention;
FIG. 3: 3 aqueous phase tracer graphs are found in 6008 wells in the example of the invention;
FIG. 4: in example 5634 of the present invention, 1 aqueous phase tracer pattern was found in the well;
FIG. 5: horizontal well plan views of 6006, 6007, 6008, 5634 wells according to embodiments of the present invention;
FIG. 6: the invention relates to a production condition curve chart of a production well.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention
The method for evaluating the fracturing interference by using the tracer comprises the following steps:
the first step is as follows: selecting suitable tracers, including selecting various tracers which are adaptive to different solution environments, wherein the various tracers are only dissolved in corresponding solutions;
the second step is that: injecting the tracer in the first step into the stratum along with the fracturing fluid, wherein the tracer injected into each section of the stratum has uniqueness;
the third step: sampling produced liquid of the fracturing production well in the second step;
the fourth step: and monitoring the data of the types and concentrations of the tracers contained in the samples in the third step, carrying out non-dimensionalization treatment on the data, and then applying a formula comprising comprehensive evaluation of the solubility of the tracers to judge and distinguish the fracture interference.
Further, the method also comprises the step of judging and distinguishing the fracture interference by combining classification calculation of the interference reasons
The method mainly comprises the following steps: when multi-section fracturing reservoir transformation is carried out, injecting a water-phase chemical tracer into a stratum along with hydraulic fracturing fluid, and calibrating the fracturing fluid; and injecting the oil phase chemical tracer into the stratum along with the proppant to calibrate the proppant. Each injected segment is a unique chemical tracer of a different type than the remaining segments. After the fracturing well is constructed, sampling and testing the output liquid (oil and water) of the production well with the pressure disturbance phenomenon in the same well group of the well. And according to the test result, calculating the fracture interference coefficient according to a weight formula, and further evaluating the fracture interference degree. The method specifically comprises the following steps:
in the first step, a suitable tracer is selected: the water-soluble tracer can be trace substance tracer, mainly rare earth substance, and is only soluble in water and insoluble in oil. The tracer has the characteristics of low cost, small using amount and high testing precision which can reach ppb to ppt level. Safe and environment-friendly, non-toxic, pollution-free and radioactivity-free. The oil-soluble tracer can be a coated proppant, and an oil-soluble substance is coated on the proppant and is dissolved in oil when meeting the oil. Thus, the addition of the tracer has no influence on normal fracturing construction.
Secondly, injecting a water-phase chemical tracer into the stratum along with the hydraulic fracturing fluid, and calibrating the fracturing fluid; and injecting the oil phase chemical tracer into the stratum along with the proppant to calibrate the proppant. Each injected segment is a unique chemical tracer of a different type than the remaining segments.
Thirdly, after the construction of the fracturing well is finished, sampling and testing the produced liquid (oil and water) of the production well with the pressure disturbance phenomenon of the same well group of the well, wherein the sampling process comprises sampling once every 1-5h within 1-3 days from the start of open flow drainage; sampling every 5-10h on days 3-10; sampling every 10-15h on days 10-15; sampling is carried out every 12-30h on 15-30 days.
And fourthly, monitoring the types and the concentrations of the tracers contained in the samples, so as to judge and distinguish the reasons causing the fracturing disturbance.
Taking a MaXX block in Xinjiang as an example, the method carries out staged fracturing construction on 6007 wells in the block, wherein the wells are divided into ten sections, and 10 water-phase tracers (MT1, MT2, MT3, MT4, MT5, MT6, MT7, MT8, MT9 and MT10) and 10 oil-phase tracers (ST1, ST2, ST3, ST4, ST5, ST6, ST7, ST8, ST9 and ST10) are respectively injected from the first section to the tenth section during construction. Due to the fracturing construction of this well, a total of 16 production wells from the block experienced fracture disturbance (as shown in FIG. 1). After the 6007 well fracturing construction is finished, the 16 wells are sampled according to a sampling system: the sampling process comprises sampling every 1-5h within 1-3 days from the start of open flow drainage; sampling every 5-10h on days 3-10; sampling every 10-15h on days 10-15; sampling is carried out every 12-30h on 15-30 days.
Preferentially, sampling is carried out once every 4h within 3 days from the start of open flow drainage; sampling every 8h on days 3-10; sampling every 12h on days 10-15; samples were taken every 24h on days 15-30. The samples were assayed and 2 aqueous phase tracers (MT3, MT4), 1 oil phase tracer (ST4) were found in 6006 wells (fig. 2); 3 aqueous phase tracers (MT4, MT5, MT6) were found in 6008 wells (see figure 3); the 1 aqueous phase tracer (MT2) was found in 5634 wells (see fig. 4), and it was determined that the fracture disturbance cause was pressure conduction in the remaining 13 wells, except for these three wells. Determining a weight index delta according to the geological characteristics of the block1、δ2、δ3Respectively 0.1, 0.3 and 0.6. The comprehensive evaluation formula of the water-soluble tracer and the comprehensive evaluation formula of the oil-soluble tracer are used for calculation, and the obtained fracture interference indexes of the 6006 well, the 6008 well and the 5634 well are respectively 0.72, 0.22 and 0.4, so that the 6006 well can be judged to be influenced more by the fracture interference. The following will describe the calculation procedure in detail by taking 6006 wells as an example.
First, data for tracer detection in wells 6007, 6006, 6008 and 5634 are given in tables 1 to 4, respectively, and the calculations for correlation below will be based on the data given in tables 1 to 4.
TABLE 1 fractured well 6007 tracer test data
TABLE 26006 well detection tracer data
TABLE 36008 well detection tracer data
TABLE 45634 well detection tracer data
The concentration of tracer MT3 in the 6006 well was divided by the concentration of tracer MT3 in the fractured well 6007 to give a dimensionless concentration C1-200/600-0.34 in the 6006 well MT 3.
The concentration of tracer MT4 in the 6006 well was divided by the concentration of tracer MT4 in the fractured well 6007 to give a dimensionless concentration C2-220/500-0.44 in the 6006 well MT 4.
The following examples illustrate the common application of comprehensive evaluation of tracer solubility, wherein fig. 5 is a top view of a horizontal well of 6006, 6007, 6008, 5634 wells, and the projected distances of the tracer injection positions from the horizontal projected distances of the wells to the bottom of 6006 wells are calculated as
And dividing the distance by the average value to obtain the following result by dimensionless processing: d1-894/850-1.05, D2-806/850-0.95.
Applying the above-mentioned formula
The concentration of the tracer ST4 in the 6006 well was divided by the concentration of the tracer ST4 in the frac well 6007 to give a dimensionless concentration Y1-50/100-0.5 in the 6006 well ST 4.
Since only one oil type was detected, the dimensionless distance was 806/806 ═ 1.
The interference coefficient of 6006 well is
R1＝δ1+δ2·FSC+δ3·FYC＝0.1+0.3×0.39+0.6×0.5＝0.72
By applying the same calculation steps, the disturbed coefficients of the 6008 well and the 5634 well can be calculated to be 0.22 and 0.4, respectively, so that the fracture disturbance of the 6006 well can be judged to be more influenced.
In summary, the following steps: by applying the method provided by the invention, the specific reasons causing the fracturing interference can be distinguished, and the fracturing interference degree of the production well can be quantitatively evaluated.
In the prior art, the judgment of the fracturing interference in the oil field is mainly based on that when a well is in the same layer or the same block for fracturing construction, the production pressure (as shown in fig. 6) of a production well rapidly rises, or the liquid production amount (as shown in fig. 6) rapidly rises. Fig. 5 is a well location diagram, which only shows the well locations of 16 wells which are disturbed by fracturing during the 6007-well fracturing construction, and at least one of the rapid production pressure rise and the rapid production fluid rise shown in fig. 6 occurs during the production process of the 16 wells, so that the method can accurately and quantificationally evaluate the disturbance degree of the tracer to the production wells compared with the prior art.
In conclusion, the invention provides an evaluation method for quantitatively evaluating the fracture interference degree of the production well by combining comprehensive evaluation of the tracer with calculation of three types of reasons of fracture interference on the fracturing production well, and provides a basis for optimizing well spacing and fracture modification scale, wherein the three specific reasons comprise that the first type is reservoir pressure conduction waves; the second type is that the fracturing fluid is carried to a production well; and the third type is that the fracturing fluid and the propping agent are both fleed to a production well, and the three reasons and dimensionless data of a tracer comprehensive evaluation formula are comprehensively calculated through an interference coefficient calculation formula to obtain an accurate result of quantitatively evaluating the interference degree of the tracer to the production well. Has great application and profound significance in the field of environment-friendly development of energy.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for evaluating fracture interference using a tracer, characterized by: the method comprises the following steps:
the first step is as follows: selecting suitable tracers, including selecting various tracers which are adaptive to different solution environments, wherein the various tracers are only dissolved in corresponding solutions;
the second step is that: injecting the tracer in the first step into the stratum along with the fracturing fluid, wherein the tracer injected into each section of the stratum has uniqueness;
the third step: sampling produced liquid of the fracturing production well in the second step;
the fourth step: monitoring the type and concentration data of the tracer in the sample in the third step, carrying out non-dimensionalization treatment on the data, and then applying a formula comprising comprehensive evaluation of the solubility of the tracer to judge and distinguish the fracture interference; the formula comprises comprehensive operation of dimensionless data of tracer concentration and well bottom distance, and the formula comprises a water-soluble tracer comprehensive evaluation formula and an oil-soluble tracer comprehensive evaluation formula;
the comprehensive evaluation formula of the water-soluble tracer agent is as follows
C11 and C12. C1a in the formula are numerical values obtained by recording the monitoring concentration of the water-soluble tracer in the fracturing production P well and performing dimensionless treatment, wherein a is the type of the water-soluble tracer, and Di is the projection distance from the injection position of the water-soluble tracer to the bottom of the fracturing production well;
the oil-soluble tracer agent has a comprehensive evaluation formula of
In the formula, Y11 and Y12.. Y1b are numerical values obtained after carrying out dimensionless treatment for recording the monitoring concentration of the oil-soluble tracer in the fracturing production P well, b is the type of the oil-soluble tracer, and Di is the projection distance from the injection position of the oil-soluble tracer to the bottom of the fracturing production well; the differential judgment of the fracturing interference further comprises the following process, firstly, the reasons of the interference comprise at least three types, wherein the first type is reservoir pressure transmission waves, the second type is that fracturing fluid flees to a production well, the third type is that the fracturing fluid and proppant flee to the production well, and the weight indexes of the three types are delta respectively1、δ2、δ3；
Secondly, through an interference coefficient calculation formula
R1＝δ1+δ2·FSC+δ3·FYC
Sequentially calculating fracture interference coefficients of fracture production wells P1, P2 and P3.. Pn;
finally, performing comparative analysis on the fracture interference coefficients of the P1, P2 and P3.. Pn of each fracture production well to obtain the degree of fracture interference of the production wells;
the calculation of the projection distance comprises the step of injecting the tracer agents into the position with the distance 6006 from the bottom of the well
And dividing the distance by the average value to obtain the following result by dimensionless processing: d1-894/850-1.05, D2-806/850-0.95,
applying the above-mentioned formula
The concentration of the tracer ST4 in the 6006 well was divided by the concentration of the tracer ST4 in the frac well 6007 to give a dimensionless concentration Y1-50/100-0.5 in the 6006 well ST4,
since only one oil type is detected, the dimensionless distance is 806/806 ═ 1,
the interference coefficient of 6006 well is
R1＝δ1+δ2·FSC+δ3·FYC＝0.1+0.3×0.39+0.6×0.5＝0.72
By applying the same calculation steps, the disturbed coefficients of the 6008 well and the 5634 well can be calculated to be 0.22 and 0.4, respectively, so that the fracture disturbance of the 6006 well can be judged to be more influenced.
2. The method of claim 1, wherein: and judging and distinguishing the fracture interference by combining classification calculation of the interference reasons.
3. The method of claim 2, wherein: the different solution environments comprise an aqueous solution environment and an oil solution environment, and the various tracers comprise water-soluble tracers and oil-soluble tracers.
4. The method of claim 2, wherein: the water-soluble tracer is a trace substance tracer.
5. The method of claim 1, wherein: the oil-soluble tracer comprises an oil-soluble substance, and the oil-soluble substance is coated on the proppant to form a coated proppant.
6. The method of claim 1, wherein: the method also comprises the steps of injecting the water-phase chemical tracer into the stratum along with the hydraulic fracturing fluid and injecting the oil-phase chemical tracer into the stratum along with the propping agent.
7. The method of claim 6, wherein: the method also comprises the steps of calibrating the fracturing fluid and calibrating the proppant.
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