CN114135266A - Efficient fracturing sand adding method based on water hammer effect - Google Patents
Efficient fracturing sand adding method based on water hammer effect Download PDFInfo
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Abstract
The invention discloses a water hammer effect-based efficient fracturing sand adding method, and relates to the technical field of fracturing yield-increasing transformation of shale gas reservoirs. The method comprises the steps of firstly forming a sand plugging early warning and prejudging method through analysis of a large number of historical fracturing construction curves, quantifying and grading sand plugging risks according to prejudging results, making corresponding pulse discharge parameters and treatment measures according to sand plugging risk grades, and finally analyzing whether the sand plugging risks are relieved or not according to an effect evaluation method. The method can be used for treating complex construction with different shaft and seam sand setting degrees, can effectively reduce engineering risks, ensures storage and reconstruction strength, does not need pump stopping and flowback operation, and provides an effective technical means for improving shale volume fracturing reconstruction effect and guaranteeing smooth on-site sand adding construction.
Description
Technical Field
The invention relates to the technical field of shale gas reservoir fracturing yield-increasing transformation, in particular to a high-efficiency fracturing sand-adding method based on a water hammer effect.
Background
The hydraulic fracturing yield-increasing transformation technology is a necessary technical means for realizing commercial exploitation of shale gas. With the further improvement of the fracturing technology on the sand adding strength, the concentration of the on-site construction sand is up to 300kg/m3However, at present, shale gas transformation still mainly uses slick water, and is influenced by construction discharge capacity and slick water viscosity, sand deposition in a shaft and a seam frequently occurs in a fracturing site, so that high pumping pressure and difficulty in sand addition occur in the later stage of construction, even sand blockage is caused, and the reservoir yield-increasing transformation effect is limited to a great extent. Aiming at the sand setting phenomenon occurring under the prior art, the invention of an effective treatment technology which can be implemented on site is urgently needed to ensure that the requirement of reservoir transformation is met.
At present, no effective treatment measures and methods exist for solving the problem of sand setting in a shaft or a seam caused by increasing the sand concentration during the fracturing construction of the shale gas well, and the problems are generally treated by back-discharge and blow-out after sand blocking on site, namely injected formation fluid is discharged back through a ground oil nozzle, and the formation fluid is expected to flush the sand setting from a reservoir and the shaft to the ground, so that the aim of removing the sand blocking is fulfilled. The method is similar to the process of the patent application (application number: 202010340871.3) already filed. The prior art mainly has the following three defects: firstly, an early warning and prejudging method for sand blockage is lacked, and the normal construction progress is seriously influenced by treating the sand blockage according to different pressure changes on site; secondly, a large amount of flowback liquid is generated by flowback discharge spraying treatment, so that large pressure is brought to field storage and environmental protection; thirdly, the time consumption of the flowback treatment process is long, 1.5-2 times of the volume fluid of the shaft needs to be flowback under the common condition, the time consumption is 3-5 hours, and the fracturing construction aging is greatly reduced.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a high-efficiency fracturing sand adding method based on a water hammer effect, and aims to solve the problems that early warning and prejudgment on sand blockage, flowback discharge and spray treatment are not beneficial to field storage and environmental protection, the flowback treatment process consumes long time, and the fracturing construction time is greatly reduced in the prior art. The method comprises the steps of firstly forming a sand blocking early warning and prejudging method through analysis of a large number of historical fracturing construction curves, quantifying and grading sand blocking risks according to prejudging results, making corresponding pulse displacement parameters and treatment measures according to sand blocking risk grading, and finally analyzing whether the sand blocking risks are relieved or not according to an effect evaluation method. The method can be used for treating complex construction with different shaft and seam sand setting degrees, can effectively reduce engineering risks, ensures storage and reconstruction strength, does not need pump stopping and flowback operation, and provides an effective technical means for improving shale volume fracturing reconstruction effect and guaranteeing smooth on-site sand adding construction.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
A high-efficiency fracturing sand adding method based on a water hammer effect comprises the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
s2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation;
s3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
Further, in step S1, the slope of the historical critical pressure is quantified according to the interval where sand-plugging has occurred in the target block, i.e. there is a discriminant
In the formula (I), wherein,
the historical construction pressure is shown as being,
the historical construction displacement is shown and indicated,
the historical construction time is shown and indicated,
representing the slope of historical sand plugging at critical pressure; the historical sand plug critical pressure time slope is the maximum probability value of all sand plug pressure time slopes that have occurred.
Furthermore, in step S1, the sand plugging risk of the target block is divided into three levels, i.e., level i risk, level ii risk and level iii risk, according to the historical sand plugging critical pressure slope and the sand plugging critical pressure slope of the target block, where the level iii risk is the highest, i.e., the critical state of sand plugging.
Further, in step S1, the sand-blocking risk classification and quantification criterion for the target block is
Further, the over-top design and the sticky flushing in step S2 are used when the sand clogging risk is judged as a level i risk and/or a level ii risk in the classification quantification in step S1.
The over-jacking design means that from the time of stopping the sand-carrying fluid from being added, the volume of the fracturing fluid added subsequently is more than 1.5 times of the volume of the shaft, so that the sand-carrying fluid is ensured to enter a reservoir stratum, and sand settlement of the sand-carrying fluid in the shaft in the displacement adjusting stage is prevented.
The variable viscosity flushing is to improve the viscosity of the fracturing fluid according to the sand plugging risk level, and if the i-th sand plugging risk occurs, the viscosity of the fracturing fluid is set to be i +1 times of that of the fracturing fluid in normal construction, so that the sand carrying capacity of the fracturing fluid is improved.
The water hammer effect evaluation is used when the sand blocking risk is not relieved after the overhead design and the variable viscosity flushing are adopted.
The water hammer effect evaluation means that firstly, the displacement change is evaluated according to the water hammer principle
And water hammer pressure is generated at the position of the bottom hole crack to promote the migration and washout of settled sand or a sand bridge, so that the sand blocking risk is eliminated.
The specific displacement adjusting method in the water hammer effect evaluation is that the water hammer displacement requirement and the construction pressure requirement are comprehensively considered, and the water hammer occurrence time is
Within a range of, increasing or decreasingLow construction displacement, then according to time
Recovering the construction displacement, and calculating the water attack displacement amplitude and the water attack time according to the following formula during displacement adjustment:
in the formula (I), the compound is shown in the specification,
indicating the amplitude of the displacement change of the water hammer,
the time of occurrence of the water hammer is represented,
the slope at the critical pressure of sand plugging is shown,
the construction pressure is shown as a result of the construction,
the construction displacement is shown and indicated,
the construction time is shown.
In step S4, the increase in sand concentration means the ratio of the sand concentration at the end of the sand clogging treatment to the sand concentration at the initial stage of the treatment, and the larger the value, the better.
In step S4, the pressure gradient is recalculated based on the formula in step S1.
Further, in step S4, the effect of sand clogging treatment is evaluated based on the rise width and the pressure gradient of the sand concentration after completion of construction, and the discriminant equation is as follows:
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the method makes up for perfecting the early warning and grading quantification method of different sand setting degrees and sand blocking risks in the fracturing construction site, and provides technical guidance for further guiding the site to adopt sand blocking treatment measures;
2. the design method and the empirical parameters have good effect on the sand blocking treatment of the shale gas fracturing construction at present, the method can avoid the pump-off flowback operation, greatly improve the construction timeliness and reduce the environmental pollution caused by flowback;
3. the efficient fracturing sand adding method based on the water hammer effect is novel in design concept, reliable in empirical parameters and easy to implement on site, and provides a new feasible technical means for promoting efficient development of shale gas reservoirs.
Drawings
FIG. 1 is a high-efficiency fracturing sand-adding construction curve diagram based on water hammer effect.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As a preferred embodiment of the present invention, the present embodiment discloses a high-efficiency fracturing sand-adding method based on water hammer effect, which includes the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
s2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation;
s3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
Example 2
As another preferred embodiment of the present invention, the present embodiment discloses a high-efficiency fracturing sand-adding method based on water hammer effect, which includes the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
as an implementation manner of this embodiment, in step S1, the slope of the historical critical pressure is quantified according to the interval where sand-plugging has occurred in the target block, that is, there is a discriminant
In the formula (I), wherein,
the historical construction pressure is shown as being,
the historical construction displacement is shown and indicated,
the historical construction time is shown and indicated,
representing the slope of historical sand plugging at critical pressure; the historical sand plug critical pressure time slope is the maximum probability value of all sand plug pressure time slopes that have occurred.
Furthermore, in step S1, the sand plugging risk of the target block is divided into three levels, i.e., level i risk, level ii risk and level iii risk, according to the historical sand plugging critical pressure slope and the sand plugging critical pressure slope of the target block, where the level iii risk is the highest, i.e., the critical state of sand plugging.
S2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation; the over-the-top design and the variable viscosity flush are used when the sand clogging risk is judged as the class i risk and/or the class ii risk in the classification quantification in the step S1. The water hammer effect evaluation is used when the sand blocking risk is not relieved after the overhead design and the variable viscosity flushing are adopted.
S3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
Example 3
As another preferred embodiment of the present invention, the present embodiment discloses a high-efficiency fracturing sand-adding method based on water hammer effect, which includes the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
as an implementation manner of this embodiment, in step S1, the slope of the historical critical pressure is quantified according to the interval where sand-plugging has occurred in the target block, that is, there is a discriminant
In the formula (I), wherein,
the historical construction pressure is shown as being,
the historical construction displacement is shown and indicated,
the historical construction time is shown and indicated,
representing the slope of historical sand plugging at critical pressure; the historical sand plug critical pressure time slope is the maximum probability value of all sand plug pressure time slopes that have occurred.
Further, in step S1, the sand-blocking risk classification and quantification criterion for the target block is
S2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation; the over-the-top design and the variable viscosity flush are used when the sand clogging risk is judged as the class i risk and/or the class ii risk in the classification quantification in the step S1. The water hammer effect evaluation is used when the sand blocking risk is not relieved after the overhead design and the variable viscosity flushing are adopted.
S3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
Example 4
As another preferred embodiment of the present invention, the present embodiment discloses a high-efficiency fracturing sand-adding method based on water hammer effect, which includes the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
as an implementation manner of this embodiment, in step S1, the slope of the historical critical pressure of the target block is quantified according to the interval where sand-plugging has occurred, that is, there is a discriminant
In the formula (I), wherein,
the historical construction pressure is shown as being,
the historical construction displacement is shown and indicated,
the historical construction time is shown and indicated,
representing the slope of historical sand plugging at critical pressure; the historical sand plug critical pressure time slope is the maximum probability value of all sand plug pressure time slopes that have occurred.
Further, in step S1, the sand-blocking risk classification and quantification criterion for the target block is
S2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation; the over-the-top design and the variable viscosity flush are used when the sand clogging risk is judged as the class i risk and/or the class ii risk in the classification quantification in the step S1. The water hammer effect evaluation is used when the sand blocking risk is not relieved after the overhead design and the variable viscosity flushing are adopted.
Furthermore, the over-jacking design means that from the time of stopping the adding of the sand carrying fluid, the volume of the fracturing fluid added subsequently is more than 1.5 times of the volume of the well bore, so that the sand carrying fluid can enter the reservoir, and sand settling of the sand carrying fluid in the well bore in the displacement adjusting stage is prevented.
The variable viscosity flushing is to improve the viscosity of the fracturing fluid according to the sand plugging risk level, and if the i-th sand plugging risk occurs, the viscosity of the fracturing fluid is set to be i +1 times of that of the fracturing fluid in normal construction, so that the sand carrying capacity of the fracturing fluid is improved.
The water hammer effect evaluation means that firstly, the displacement change is evaluated according to the water hammer principle
And water hammer pressure is generated at the position of the bottom hole crack to promote the migration and washout of settled sand or a sand bridge, so that the sand blocking risk is eliminated.
The specific displacement adjusting method in the water hammer effect evaluation is that the water hammer displacement requirement and the construction pressure requirement are comprehensively considered, and the water hammer occurrence time is
Within the range, the construction displacement is increased or decreased and then according to time
Recovering the construction displacement, and calculating the water attack displacement amplitude and the water attack time according to the following formula during displacement adjustment:
in the formula (I), the compound is shown in the specification,
indicating the amplitude of the displacement change of the water hammer,
the time of occurrence of the water hammer is represented,
the slope at the critical pressure of sand plugging is shown,
the construction pressure is shown as a result of the construction,
the construction displacement is shown and indicated,
the construction time is shown.
S3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
The increase range of the sand concentration refers to the ratio of the sand concentration at the final stage of sand plugging treatment to the sand concentration at the initial stage of treatment, and the larger the value is, the better the value is.
In step S4, the pressure gradient is recalculated based on the formula in step S1.
Further, in step S4, the effect of sand clogging treatment is evaluated based on the rise width and the pressure gradient of the sand concentration after completion of construction, and the discriminant equation is as follows:
Example 5
As the most basic implementation scheme of the invention, the embodiment discloses a water hammer effect-based high-efficiency fracturing sand adding method for removing sand blockage in a seam, which specifically comprises the following steps:
the method comprises three parts, namely a method for prejudging the sand setting degree in the joint, pulse discharge design for removing sand blocking risks and sand blocking treatment effect evaluation.
The first step is as follows: method for prejudging sand setting degree in seam
Firstly, empirical analysis of historical sand plugging data, namely, quantifying the slope of the interval with the sand plugging according to the constructed target block, namely, a discriminant
In the formula
、
、t、
The historical construction pressure, the discharge capacity, the time and the slope of the sand plugging critical pressure are respectively, wherein the sand plugging critical pressure is particularly explainedThe time slope is the maximum probability value of all the pressure time slopes with sand blockage, namely the pressure time slope value with the maximum probability of sand blockage.
Secondly, based on the grading and quantification of the sand plugging risk of the time slope, namely, the obtained sand plugging critical pressure time slope is applied
Quantifying different sand setting degrees, preferably making a basis for removing sand blocking measures, and having the following standards:
and (3) respectively quantifying three sand blockage early warning grades with different sand setting degrees according to the formula (2), wherein the grade III risk grade is the highest grade, namely the critical state of sand blockage.
The second step is that: the design of pulse displacement for eliminating sand blocking risk,
the method comprises the following steps of firstly, over-top design and variable viscosity flushing, wherein the over-top design means that when the sand-carrying fluid is stopped to be added, the volume of the subsequently added fracturing fluid is more than 1.5 times of the volume of a shaft, so that the sand-carrying fluid is ensured to enter a reservoir stratum, and sand settling of the sand-carrying fluid in the shaft in a pulse displacement stage is prevented; the variable viscosity flushing refers to the increase of the viscosity of the fracturing fluid according to the sand plugging risk level, and the fluid viscosity is set to be (i +1) times of the fluid viscosity in normal construction under the normal condition when the i-th sand plugging risk occurs, so that the sand carrying capacity of the fluid is improved.
The pulse displacement design is mainly used when the sand blocking risk is not released after the over-top design and the variable-viscosity flushing are adopted, firstly, the construction displacement is increased to the maximum according to the construction site pressure limiting, then, the construction displacement is instantaneously reduced in a step shape according to a certain percentage of the maximum displacement, and then, the displacement is restored in a step shape according to the proportion, so that the exciting pressure is generated at the bottom hole crack position through the displacement pulse change, the sand setting or the sand bridge is promoted to move and disperse, and the sand blocking risk is released. During the pulse displacement operation, the displacement amplitude and the pulse time are calculated according to the following formula:
in the formula
、
The pulse displacement amplitude and the pulse time are respectively, and construction is carried out according to the displacement amplitude and the pulse time during site construction until the sand blockage risk is relieved.
The third step: sand block treating effect
The sand concentration increase amplitude mainly refers to the ratio of sand concentration at the last stage of sand plugging treatment to sand concentration at the initial stage of treatment, and the larger the value is, the better the value is;
and secondly, evaluating the pressure time slope, which mainly means recalculating the processed pressure time slope according to the formula (1), and judging that the sand blocking risk is successfully removed when the sand concentration lifting amplitude and the pressure time slope simultaneously satisfy the formulas (5) and (6).
In the formula
、
The sand concentration at the initial stage and the final stage of the sand blocking treatment are respectively.
Claims (13)
1. A high-efficiency fracturing sand adding method based on a water hammer effect is characterized by comprising the following steps:
s1, analyzing historical sand plugging data of the target block, analyzing the historical sand plugging critical pressure time slope of the sand plugging layer section of the target block, and carrying out sand plugging risk grading quantification on the target block according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block obtained through analysis;
s2, according to the sand blockage risk grading and quantifying result in the step S1, carrying out displacement scheme design for removing the sand blockage risk; the designed displacement scheme for removing the sand blocking risk comprises one or more of a combination scheme of overhead design, viscosity-variable flushing and water hammer effect evaluation;
s3, carrying out sand plugging removal construction according to the discharge capacity scheme for removing the sand plugging risk formulated in the step S2 until the sand plugging risk is removed;
and S4, calculating the sand concentration lifting amplitude and the pressure slope after the construction in the step S3, and evaluating the sand blocking treatment effect.
2. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: in step S1, the slope of the historical critical pressure is quantified according to the sand-blocked interval of the target block, i.e. there is a discriminant
In the formula (I), wherein,
the historical construction pressure is shown as being,
the historical construction displacement is shown and indicated,
the historical construction time is shown and indicated,
representing the slope of historical sand plugging at critical pressure; the historical sand plug critical pressure time slope is the maximum probability value of all sand plug pressure time slopes that have occurred.
3. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: in the step S1, the sand plugging risk of the target block is divided into three levels, i.e., level i risk, level ii risk and level iii risk, according to the historical sand plugging critical pressure time slope and the sand plugging critical pressure time slope of the target block, where the level iii risk is the highest, i.e., the critical state of sand plugging.
4. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: in step S1, the sand-blocking risk classification and quantification standard for the target block is
5. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 3 or 4, wherein: in the step S2, the overhead design and the variable viscosity washing are used when the sand clogging risk is judged as a level i risk and/or a level ii risk in the classification quantification in the step S1.
6. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: the over-jacking design means that from the time of stopping the sand-carrying fluid from being added, the volume of the fracturing fluid added subsequently is more than 1.5 times of the volume of the shaft, so that the sand-carrying fluid is ensured to enter a reservoir stratum, and sand settlement of the sand-carrying fluid in the shaft in the displacement adjusting stage is prevented.
7. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 5, wherein the method comprises the following steps: the variable viscosity flushing is to improve the viscosity of the fracturing fluid according to the sand plugging risk level, and if the i-th sand plugging risk occurs, the viscosity of the fracturing fluid is set to be i +1 times of that of the fracturing fluid in normal construction, so that the sand carrying capacity of the fracturing fluid is improved.
8. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 6 or 7, wherein: the water hammer effect evaluation is used when the sand blocking risk is not relieved after the overhead design and the variable viscosity flushing are adopted.
9. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: the water hammer effect evaluation means that firstly, the displacement change is evaluated according to the water hammer principle
And water hammer pressure is generated at the position of the bottom hole crack to promote the migration and washout of settled sand or a sand bridge, so that the sand blocking risk is eliminated.
10. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 9, wherein: the specific displacement adjusting method in the water hammer effect evaluation is that the water hammer displacement requirement and the construction pressure requirement are comprehensively considered, and the water hammer occurrence time is
Within the range, the construction displacement is increased or decreased and then according to time
Recovering the construction displacement, and calculating the water attack displacement amplitude and the water attack time according to the following formula during displacement adjustment:
in the formula (I), the compound is shown in the specification,
indicating the amplitude of the displacement change of the water hammer,
the time of occurrence of the water hammer is represented,
the slope at the critical pressure of sand plugging is shown,
the construction pressure is shown as a result of the construction,
the construction displacement is shown and indicated,
the construction time is shown.
11. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1, wherein the method comprises the following steps: in step S4, the increase in sand concentration means the ratio of the sand concentration at the end of the sand clogging treatment to the sand concentration at the initial stage of the treatment, and the larger the value, the better.
12. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1 or 11, wherein: in step S4, the pressure gradient is recalculated based on the formula in step S1.
13. The high-efficiency fracturing sand adding method based on the water hammer effect as claimed in claim 1 or 11, wherein: in the step S4, the sand clogging treatment effect is evaluated according to the sand concentration increase range and the pressure gradient after the completion of the construction, and the discriminant formula is as follows:
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