CN116066047A - Fracturing construction method for treating shale near-well distortion friction - Google Patents
Fracturing construction method for treating shale near-well distortion friction Download PDFInfo
- Publication number
- CN116066047A CN116066047A CN202111269846.1A CN202111269846A CN116066047A CN 116066047 A CN116066047 A CN 116066047A CN 202111269846 A CN202111269846 A CN 202111269846A CN 116066047 A CN116066047 A CN 116066047A
- Authority
- CN
- China
- Prior art keywords
- friction
- construction
- fracturing
- sand
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims abstract description 116
- 239000004576 sand Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 48
- 230000002159 abnormal effect Effects 0.000 claims description 46
- 239000012530 fluid Substances 0.000 claims description 44
- 238000012360 testing method Methods 0.000 claims description 26
- 238000011156 evaluation Methods 0.000 claims description 16
- 238000013461 design Methods 0.000 claims description 13
- 238000011160 research Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 208000010392 Bone Fractures Diseases 0.000 abstract description 16
- 206010017076 Fracture Diseases 0.000 abstract description 16
- 238000011161 development Methods 0.000 abstract description 14
- 230000009466 transformation Effects 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 3
- 235000021185 dessert Nutrition 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 2
- 235000011850 desserts Nutrition 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a fracturing construction method for treating shale near-well distortion friction, and relates to the technical field of unconventional oil and gas reservoir development. According to the natural fracture development characteristics of shale reservoirs in China, the method for judging the near-well distortion friction is combined, critical sand carrying concentration and scale calculation are carried out by applying field actual measurement data, circulation times are determined according to construction pressure amplitude reduction, and finally the fracturing construction method for treating the shale near-well distortion friction is formed. The fracturing construction method disclosed by the invention can be used for treating near-well distortion friction when a larger included angle exists between a natural fracture and a hydraulic fracture, can effectively reduce construction risks, ensures in-section transformation strength, can not leak out of a natural fracture development dessert area, and provides an effective technical means for improving shale volume fracturing transformation effect and ensuring smooth on-site sand adding construction.
Description
Technical Field
The invention relates to the technical field of unconventional oil and gas reservoir development, in particular to a fracturing construction method for treating shale near-well distortion friction.
Background
The shale reservoir is strong in heterogeneity, natural cracks are more developed than conventional reservoirs, the communication area between the hydraulic cracks and a reservoir matrix is effectively increased on the one hand due to the developed natural cracks, and small challenges are brought to sand fracturing construction on the other hand. Especially when the natural crack trend and the hydraulic crack trend have a larger included angle, the fracturing construction pressure is high frequently, sand adding is difficult, even sand blocking occurs, and higher risks are brought to subsequent maintenance of sand adding strength and transformation effect. Therefore, aiming at the problems of restricting shale fracturing and sand adding and the like due to natural crack development, the invention needs to provide an on-site effective treatment measure and method, which have important significance for ensuring effective modification of shale reservoirs.
Currently, aiming at the problem that shale gas wells are restricted to fracturing and sand adding construction due to natural crack development, no effective treatment measures and methods exist, and two methods are generally adopted on site aiming at the problem. Firstly, the sand adding amount is reduced, so that the principle of smooth construction without sand blocking is ensured, and the sand adding amount of the method is less than 10% of the designed sand amount under the normal condition, and the fracturing transformation effect cannot be effectively ensured.
The second is to adopt the sand fracturing to stop the pump fracturing and turn to the method to process, for example, the intellectual property agency of China is 11 months 13 days in 2020, a published patent application with publication number CN111927423A, the name is "a shale sand fracturing to stop the pump fracturing and turn to the method", this invention patent includes pumping the sand carrier fluid to polish the stratum crack, monitor the pumping pressure; when the pumping pressure rises to reach wellhead pressure limit, displacing sand-carrying fluid with slickwater to pump; stopping the pump to reduce the pumping displacement from the first displacement to zero and hold for a predetermined period of time; starting a pump to pump pre-liquid into the well and rapidly increasing the pumping displacement to a first displacement; after the front-end liquid pump is injected, pumping sand-carrying liquid again to carry out fracturing construction; under the action of energy pulse generated by stopping and starting the pump and pressure difference generated by the sedimentation of the propping agent, starting a new crack to turn the crack; repeating the process to finish fracturing construction; the first displacement is the design construction displacement or the maximum construction displacement under wellhead pressure limiting conditions. The hydraulic fracture is forced to turn to open a new fracture by the method, so that the influence of the natural fracture on the opened fracture is avoided. The method has a certain effect aiming at the situation that the development scale of the natural cracks is smaller, if the whole natural cracks of the fracturing section are developed, the limitation of the whole natural cracks on sand fracturing cannot be avoided, and missing desserts exist, namely the natural crack development area is the important point of the fracturing construction transformation, but the method is contrary, in order to ensure that the construction is smooth and forced to avoid the natural crack development area, the missing transformation desserts exist.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a fracturing construction method for treating shale near-well distortion friction, which is formed by combining a method for judging near-well distortion friction according to the natural crack development characteristics of shale reservoirs in China, performing critical sand carrying concentration and scale calculation by using field actual measurement data, and determining the circulation times according to construction pressure reduction. The fracturing construction method disclosed by the invention can be used for treating near-well distortion friction when a larger included angle exists between a natural fracture and a hydraulic fracture, can effectively reduce construction risks, ensures in-section transformation strength, can not leak out of a natural fracture development dessert area, and provides an effective technical means for improving shale volume fracturing transformation effect and ensuring 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 fracturing construction method for treating shale near-well distortion friction comprises the following steps:
a near-well distortion friction field judging step, namely judging whether abnormal friction exists in the fracturing construction of the section according to the fluctuation degree of the construction pressure of the section to be fractured compared with the pressure of the normal section when the design construction displacement is established; carrying out different displacement friction tests on the fracturing construction section with abnormal friction, and judging whether the fracturing construction section has abnormal near-well distortion friction according to test results; if the near-well distortion friction exists, carrying out a dense slug sand adding treatment step;
a dense slug sand adding treatment step, namely carrying out fracturing construction on a fracturing section with abnormal near-well distortion friction resistance by applying a low sand concentration, short slug and multi-flushing sand adding mode; calculating the crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson's ratio of the single-cluster crack according to the abnormal near-well distortion friction obtained in the near-well distortion friction field grinding and judging step; thus obtaining a pumping program for treating shale fracturing near-well distortion friction; performing dense slug sand adding treatment according to the obtained pumping program;
and a treatment effect evaluation step, namely judging whether the near-well distortion friction treatment is successful or not according to the percentage of the increase of the sand concentration at the end of the dense slug sand adding treatment compared with the sand concentration at the initial stage of the treatment and the change value of the construction pressure and the normal section construction pressure during the design construction displacement established at the end of the treatment.
Furthermore, in the on-site grinding and judging step of near-well distortion friction, a friction grinding and judging threshold value is set, and if the fluctuation of the construction pressure of the section to be fractured is larger than the fluctuation of the pressure of the normal section when the design construction displacement is established, abnormal friction in the fracturing construction of the section can be confirmed.
Specifically, the fluctuation range of the construction pressure of the section to be fractured is f (Q) T ,p T )>C, f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is the friction resistance research judgment threshold value.
In the on-site grinding and judging step of near-well distortion friction, different displacement friction tests are carried out on a fracturing construction section with abnormal friction, specifically, different displacement friction tests are carried out for further clearing abnormal friction types, and a specific test formula is as follows:
f(q i ,P pfi ,P nwi ,P fi )＝P Ti -ISIP (i=1, 2,3, …); wherein q is i ,P pfi ,P nwi ,P fi Displacement at ith test, hole friction, near-well twist friction, edge Cheng Mazu, P Ti The construction pressure at the ith test is the pump stopping pressure.
In the on-site research and judgment step of near-well distortion friction, an abnormal distortion friction threshold is set, and if the well entering distortion friction is larger than the abnormal distortion friction threshold, the abnormal near-well distortion friction can be confirmed in the fracturing construction.
In the dense slug sand adding treatment step, the calculation formulas of single-cluster crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson ratio are shown as follows:
ω＝f(q c ,p nw ,p T ,ISIP,μ,ρ,E,ν)；
C s ＝f(q c ,ω,μ,ρ,p T )；
V s ＝f(q c ,p T ,ω,μ,ρ,C s )；
n＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
η＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
wherein ω represents the seam width of a single cluster of cracks, C s Represents critical sand-carrying fluid concentration, V s The size of the sand-carrying fluid slug is represented, n represents the stage sand concentration lifting amplitude, eta represents the circulation times of the sand plug, and q c The cluster fracture inflow is expressed, μ represents the fracturing fluid viscosity, ρ represents the fracturing fluid density, E represents the reservoir young's modulus, and v represents poisson's ratio.
The treatment effect evaluation step comprises the steps of sand concentration lifting amplitude evaluation and equal discharge pressure evaluation, and the specific discriminant is as follows:
η d ＝f(C s ,C sd )>C d ；
f(Q T ,p T )<c, in eta d Represents the final sand concentration elevation, C sd Indicating the end stage sand concentration, C d Represents the lifting multiple, f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is a friction research judgment threshold value; when the two formulas are simultaneously established, the near-well distortion friction of the fracturing construction is successfully treated.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the near-well distortion friction determination method is based on-site actual measurement data, has the characteristic of good reliability, has strong operability on the near-well distortion friction processing steps, and is in accordance with objective rules.
2. The design method and the experience parameters of the invention have better effect on near-well distortion friction in the current shale gas fracturing construction treatment, and the method can realize effective transformation of a natural fracture development section, and can further strengthen the effective transformation of a fracture development reservoir section while guaranteeing the sand adding strength.
3. According to the method, aiming at the shale field fracturing abnormal construction section, the purpose of obtaining the near-well distortion friction of the abnormal section is achieved, on the basis of obtaining different displacement, pressure and sand concentration of the field, the normal section distortion friction abnormal threshold obtained by the well or an adjacent well is used as a judgment standard, the simulated fracturing section distortion friction is obtained quickly and accurately through calculation, a targeted fracturing measure is formed for field treatment, and finally the near-well distortion friction treatment effect is evaluated according to the final sand concentration lifting amplitude and the pressure fluctuation amplitude of the simulated fracturing section construction pressure compared with the normal section (the sand concentration lifting amplitude and the pressure fluctuation amplitude are the field capable of directly obtaining more visual data, and the treatment effect can be judged quickly), so that the method is convenient and easy to operate, and quick and effective.
4. The shale near-well distortion friction treatment method disclosed by the invention is novel in design concept, reliable in experience parameters and feasible in site implementation, and provides a new feasible technical means for promoting efficient development of shale gas reservoirs.
Drawings
FIG. 1 is a pumping sequence diagram of the present invention.
Detailed Description
The technical scheme of the invention is further elaborated below in conjunction with the description and drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As a preferred embodiment of the invention, the embodiment discloses a fracturing construction method for treating shale near-well distortion friction, which comprises the following steps:
a near-well distortion friction field judging step, namely judging whether abnormal friction exists in the fracturing construction of the section according to the fluctuation degree of the construction pressure of the section to be fractured compared with the pressure of the normal section when the design construction displacement is established; carrying out different displacement friction tests on the fracturing construction section with abnormal friction, and judging whether the fracturing construction section has abnormal near-well distortion friction according to test results; and if the near-well distortion friction exists, performing a dense slug sand adding treatment step.
The establishment of the design construction displacement refers to that geological designers evaluate the reservoir parameters, stress characteristics and the like of the well, and the fracturing designers simulate corresponding friction under different displacements according to the depth of the reservoir, the stress characteristics and the corresponding friction under different displacements, so that the theme construction displacement under pressure limiting conditions is converted.
The pressure for the construction of the simulated fracturing is the pressure in the actual construction of the site, and the pressure can have obvious difference in the actual fracturing of different fracturing sections, and the difference can be used as the judgment basis for judging whether the friction resistance abnormality exists.
The pressure of the normal section is obtained according to an actual construction curve, the construction of the normal section is relatively stable, and the pressure fluctuation cause of the abnormal section mainly comes from abnormal change of friction.
A dense slug sand adding treatment step, namely carrying out fracturing construction on a fracturing section with abnormal near-well distortion friction resistance by applying a low sand concentration, short slug and multi-flushing sand adding mode; calculating the crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson's ratio of the single-cluster crack according to the abnormal near-well distortion friction obtained in the near-well distortion friction field grinding and judging step; thus obtaining a pumping program for treating shale fracturing near-well distortion friction; performing dense slug sand adding treatment according to the obtained pumping program;
and a treatment effect evaluation step, namely judging whether the near-well distortion friction treatment is successful or not according to the percentage of the increase of the sand concentration at the end of the dense slug sand adding treatment compared with the sand concentration at the initial stage of the treatment and the change value of the construction pressure and the normal section construction pressure during the design construction displacement established at the end of the treatment. The method is characterized in that the actual effect of field treatment is carried out after the abnormal torsion friction is judged, namely, the sand concentration can be effectively improved, and the construction pressure is restored to the normal level, so that the treatment is considered to be effective.
Furthermore, in the on-site grinding and judging step of near-well distortion friction, a friction grinding and judging threshold value is set, and if the fluctuation of the construction pressure of the section to be fractured is larger than the fluctuation of the pressure of the normal section when the design construction displacement is established, abnormal friction in the fracturing construction of the section can be confirmed. The friction resistanceThe judging threshold is calculated according to the construction of the normal section of the platform in a plurality of sections, different wells of different blocks are different, and the general value is within 3MPa. At 12-14m 3 Under the displacement condition of/min, the normal section generally has a distortion friction value not exceeding 3MPa.
Specifically, the fluctuation range of the construction pressure of the section to be fractured is f (Q) T ,p T )>C, f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is the friction resistance research judgment threshold value.
In the on-site grinding and judging step of near-well distortion friction, different displacement friction tests are carried out on a fracturing construction section with abnormal friction, specifically, different displacement friction tests are carried out for further clearing abnormal friction types, and a specific test formula is as follows:
f(q i ,P pfi ,P nwi ,P fi )＝P Ti -ISIP (i=1, 2,3, …); wherein q is i ,P pfi ,P nwi ,P fi Displacement at ith test, hole friction, near-well twist friction, edge Cheng Mazu, P Ti The construction pressure at the ith test is the pump stopping pressure.
In the on-site research and judgment step of near-well distortion friction, an abnormal distortion friction threshold is set, and if the well entering distortion friction is larger than the abnormal distortion friction threshold, the abnormal near-well distortion friction can be confirmed in the fracturing construction. The abnormal threshold of the bending friction resistance is based on field construction experience, and the situation that the distortion friction resistance exceeds 3MPa and is higher than 5MPa is abnormal is judged on the spot.
In the dense slug sand adding treatment step, the calculation formulas of single-cluster crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson ratio are shown as follows:
ω＝f(q c ,p nw ,p T ,ISIP,μ,ρ,E,ν)；
C s ＝f(q c ,ω,μ,ρ,p T )；
V s ＝f(q c ,p T ,ω,μ,ρ,C s )；
n＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
η＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
wherein ω represents the seam width of a single cluster of cracks, C s Represents critical sand-carrying fluid concentration, V s The size of the sand-carrying fluid slug is represented, n represents the stage sand concentration lifting amplitude, eta represents the circulation times of the sand plug, and q c The cluster fracture inflow is expressed, μ represents the fracturing fluid viscosity, ρ represents the fracturing fluid density, E represents the reservoir young's modulus, and v represents poisson's ratio.
The treatment effect evaluation step comprises the steps of sand concentration lifting amplitude evaluation and equal discharge pressure evaluation, and the specific discriminant is as follows:
η d ＝f(C s ,C sd )>C d ；
f(Q T ,p T )<c, in eta d Represents the final sand concentration elevation, C sd Indicating the end stage sand concentration, C d Representing the lifting multiple, wherein the lifting multiple is an empirical parameter, and the value is generally 2-6; f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is a friction research judgment threshold value; when the two formulas are simultaneously established, the near-well distortion friction of the fracturing construction is successfully treated.
Example 2
As a further preferred embodiment of the present invention, referring to fig. 1 of the specification, this embodiment discloses:
a fracturing construction method for treating shale near-well distortion friction comprises the following steps:
a fracturing construction method for treating shale near-well distortion friction specifically comprises the following steps: and (3) performing on-site research and judgment of near-well distortion friction resistance, and performing a dense slug sand adding treatment method and treatment effect evaluation.
The first step: the on-site research and judgment of near-well distortion friction mainly comprises displacement establishment pressure evaluation and friction tests with different displacement, namely discriminant type
f(Q T ,p T )>C (1)
In f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is the friction resistance research judgment threshold value. When the formula (1) is established, abnormal friction resistance of the fracturing construction can be confirmed.
And a second step of: the friction test with different displacement mainly refers to the friction test with different displacement developed for further clearing abnormal friction type under the condition that the discriminant (1) is established, namely, a calculation formula is provided
f(q i ,P pfi ,P nwi ,P fi )＝P Ti -ISIP(1＝1,2,3,4,…) (2)
Q in i ,P pfi ,P nwi ,P fi Displacement at ith test, hole friction, near-well twist friction, edge Cheng Mazu, P Ti The construction pressure at the ith test is the pump stopping pressure. According to (2), the near-well twist friction P can be calculated nwi Judging whether the friction is abnormal or not by using the discriminant (3)
P nw >Const (3)
P in the formula nw Namely near-well distortion friction, const is the abnormal threshold of distortion friction, and when the judgment (3) is established, the abnormal near-well distortion friction of the fracture can be judged.
And a third step of: the dense slug sand adding treatment method is to construct by applying a low sand concentration, short slug and multi-flushing sand adding mode, and mainly comprises single-cluster crack width calculation, critical sand-carrying fluid concentration and scale calculation and circulation times calculation of the critical sand-carrying fluid concentration, wherein the calculation formulas are shown in (4) to (8):
ω＝f(q c ,p nw ,p T ,ISIP,μ,ρ,E,ν) (4)
C s ＝f(q c ,ω,μ,ρ,p T ) (5)
V s ＝f(q c ,p T ,ω,μ,ρ,C s ) (6)
n＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ) (7)
η＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ) (8)
omega, C s 、V s 、n、η、q c Mu, rho, E and v are the crack width of a single cluster crack, the critical sand-carrying fluid concentration, the size of a sand-carrying fluid slug, the lifting amplitude of the stage sand concentration, the circulation times of the sand plug, the liquid inlet amount of the single cluster crack, the viscosity of fracturing fluid, the density of the fracturing fluid, the Young modulus of a reservoir and the Poisson ratio respectively. Pumping procedures for treating shale fracturing near-well distortion friction can be obtained according to formulas (4) - (8), and an example of the pumping procedures is shown in figure 1.
Fourth step: the treatment effect evaluation mainly comprises two parts of sand concentration lifting amplitude and same-displacement pressure evaluation, and aims to evaluate whether the near-well distortion friction is successfully treated. The discriminant is as follows:
η d ＝f(C s ,C sd )>C d (9)
f(Q T ,p T )<C (10)
in eta d 、C sd 、C d The final sand concentration lifting amplitude, the treatment end sand concentration and the lifting multiple are respectively determined, and when discriminants (9) and (10) are simultaneously established, the near-well distortion friction of the fracturing construction is successfully treated.
The implementation of shale reservoir energized volume pressure technology is completed.
Claims (7)
1. A fracturing construction method for treating shale near-well distortion friction is characterized by comprising the following steps: the method comprises the following steps:
a near-well distortion friction field judging step, namely judging whether abnormal friction exists in the fracturing construction of the section according to the fluctuation degree of the construction pressure of the section to be fractured compared with the pressure of the normal section when the design construction displacement is established; carrying out different displacement friction tests on the fracturing construction section with abnormal friction, and judging whether the fracturing construction section has abnormal near-well distortion friction according to test results; if the near-well distortion friction exists, carrying out a dense slug sand adding treatment step;
a dense slug sand adding treatment step, namely carrying out fracturing construction on a fracturing section with abnormal near-well distortion friction resistance by applying a low sand concentration, short slug and multi-flushing sand adding mode; calculating the crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson's ratio of the single-cluster crack according to the abnormal near-well distortion friction obtained in the near-well distortion friction field grinding and judging step; thus obtaining a pumping program for treating shale fracturing near-well distortion friction; performing dense slug sand adding treatment according to the obtained pumping program;
and a treatment effect evaluation step, namely judging whether the near-well distortion friction treatment is successful or not according to the percentage of the increase of the sand concentration at the end of the dense slug sand adding treatment compared with the sand concentration at the initial stage of the treatment and the change value of the construction pressure and the normal section construction pressure during the design construction displacement established at the end of the treatment.
2. The fracturing construction method for treating shale near-well distortion friction as claimed in claim 1, wherein the method comprises the following steps: in the on-site grinding and judging step of near-well distortion friction, a friction grinding and judging threshold value is set, and if the fluctuation of the construction pressure of the section to be fractured is larger than the fluctuation of the pressure of the normal section when the design construction displacement is established, abnormal friction in the fracturing construction of the section can be confirmed.
3. The fracturing construction method for treating shale near-well distortion friction as claimed in claim 2, wherein the method comprises the following steps: establishing the fluctuation range of the construction pressure of the quasi-fracturing section compared with the pressure of the normal section when the construction displacement is designed as f (Q) T ,p T )>C, f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is the friction resistance research judgment threshold value.
4. A fracturing construction method for treating shale near-well distortion friction as claimed in any one of claims 1-3, characterized by: in the on-site grinding and judging step of near-well distortion friction, different displacement friction tests are carried out on a fracturing construction section with abnormal friction, specifically, different displacement friction tests are carried out for further clearing abnormal friction types, and a specific test formula is as follows:
f(q i ,P pfi ,P nwi ,P fi )＝P Ti -ISIP (i=1, 2,3, …); wherein q is i ,P pfi ,P nwi ,P fi Displacement at ith test, hole friction, near-well twist friction, edge Cheng Mazu, P Ti The construction pressure at the ith test is the pump stopping pressure.
5. A fracturing construction method for treating shale near-well distortion friction as claimed in any one of claims 1-3, characterized by: in the on-site research and judgment step of near-well distortion friction, an abnormal distortion friction threshold is set, and if the well entering distortion friction is larger than the abnormal distortion friction threshold, the abnormal near-well distortion friction can be confirmed in the fracturing construction.
6. The fracturing construction method for treating shale near-well distortion friction as claimed in claim 1, wherein the method comprises the following steps: in the dense slug sand adding treatment step, the calculation formulas of single-cluster crack width, critical sand-carrying fluid concentration, sand-carrying fluid slug size, stage sand concentration lifting amplitude, sand plug circulation times, single-cluster crack liquid inlet amount, fracturing fluid viscosity, fracturing fluid density, reservoir Young modulus and Poisson ratio are shown as follows:
ω＝f(q c ,p nw ,p T ,ISIP,μ,ρ,E,ν)；
C s ＝f(q c ,ω,μ,ρ,p T )；
V s ＝f(q c ,p T ,ω,μ,ρ,C s )；
n＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
η＝f(q c ,C s ,V s ,p T ,p nw ,μ,ρ)；
wherein ω represents the seam width of a single cluster of cracks, C s Represents critical sand-carrying fluid concentration, V s The size of the sand-carrying fluid slug is represented, n represents the stage sand concentration lifting amplitude, eta represents the circulation times of the sand plug, and q c The cluster fracture inflow is expressed, μ represents the fracturing fluid viscosity, ρ represents the fracturing fluid density, E represents the reservoir young's modulus, and v represents poisson's ratio.
7. The fracturing construction method for treating shale near-well distortion friction of claim 1,2,3 or 6, wherein the method comprises the following steps: the treatment effect evaluation step comprises the steps of sand concentration lifting amplitude evaluation and equal discharge pressure evaluation, and the specific discriminant is as follows:
η d ＝f(C s ,C sd )>C d ；
f(Q T ,p T )<c, in eta d Represents the final sand concentration elevation, C sd Indicating the end stage sand concentration, C d Represents the lifting multiple, f (Q) T ,p T ) In order to establish the pressure fluctuation of the construction pressure of the to-be-fractured section compared with the normal section when the construction displacement is designed, C is a friction research judgment threshold value; when the two formulas are simultaneously established, the near-well distortion friction of the fracturing construction is successfully treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111269846.1A CN116066047B (en) | 2021-10-29 | 2021-10-29 | Fracturing construction method for treating shale near-well distortion friction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111269846.1A CN116066047B (en) | 2021-10-29 | 2021-10-29 | Fracturing construction method for treating shale near-well distortion friction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116066047A true CN116066047A (en) | 2023-05-05 |
| CN116066047B CN116066047B (en) | 2024-04-26 |
Family
ID=86180629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111269846.1A Active CN116066047B (en) | 2021-10-29 | 2021-10-29 | Fracturing construction method for treating shale near-well distortion friction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116066047B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015109917A1 (en) * | 2014-01-21 | 2015-07-30 | 东方宝麟科技发展(北京)有限公司 | Thickener for shale gas fracturing fluid, fracturing fluid and preparation method and use thereof |
| CN109267988A (en) * | 2017-07-18 | 2019-01-25 | 中国石油化工股份有限公司 | A kind of shale gas pressure break middle section plug sand adding method |
| CN110984949A (en) * | 2020-01-02 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司 | Shale continuous sand-adding fracturing process |
| CN111927423A (en) * | 2020-09-07 | 2020-11-13 | 中国石油天然气集团有限公司 | Shale sand fracturing pump-stopping fracturing steering method |
| CN112240191A (en) * | 2019-07-19 | 2021-01-19 | 中国石油化工股份有限公司 | Shale gas fracturing sand adding method |
-
2021
- 2021-10-29 CN CN202111269846.1A patent/CN116066047B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015109917A1 (en) * | 2014-01-21 | 2015-07-30 | 东方宝麟科技发展(北京)有限公司 | Thickener for shale gas fracturing fluid, fracturing fluid and preparation method and use thereof |
| CN109267988A (en) * | 2017-07-18 | 2019-01-25 | 中国石油化工股份有限公司 | A kind of shale gas pressure break middle section plug sand adding method |
| CN112240191A (en) * | 2019-07-19 | 2021-01-19 | 中国石油化工股份有限公司 | Shale gas fracturing sand adding method |
| CN110984949A (en) * | 2020-01-02 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司 | Shale continuous sand-adding fracturing process |
| CN111927423A (en) * | 2020-09-07 | 2020-11-13 | 中国石油天然气集团有限公司 | Shale sand fracturing pump-stopping fracturing steering method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116066047B (en) | 2024-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2562461C (en) | Method of treating oil and gas wells | |
| US8838427B2 (en) | Method for determining the closure pressure of a hydraulic fracture | |
| US20170114613A1 (en) | Well re-stimulation | |
| CN103628850B (en) | A kind of waterflooding oil field integral profile control water blockoff decision-making technique | |
| US9938800B2 (en) | Methods and systems for determining acidizing fluid injection rates | |
| US11613992B2 (en) | Methods and systems for characterizing and/or monitoring wormhole regimes in matrix acidizing | |
| CN110273671B (en) | Micro-acid-pressure composite injection increasing method for high-pore high-permeability reservoir on sea | |
| CN107545088A (en) | A kind of normal pressure shale gas horizontal well volume fracturing method | |
| CN108661616B (en) | Layered fracturing method suitable for sandstone oil and gas reservoir | |
| CN110685656A (en) | Fracturing and three-mining integrated construction method for low-permeability oil reservoir | |
| CN110630239A (en) | Acid fracturing method of deep carbonate rock stratum multi-acid-injection system | |
| CN110219627A (en) | A method of enhancing offshore oilfield oil well acidation effect | |
| CN111058824B (en) | Temporary plugging and shunting acidification method for strong heterogeneous sandstone reservoir through sieve tube | |
| CN116066047B (en) | Fracturing construction method for treating shale near-well distortion friction | |
| CN102562024B (en) | Fracturing design method for optimizing uniform spreading concentration | |
| CN111810108B (en) | Dynamic adjusting system and method for back-flow oil nozzle after shale gas horizontal well pressure | |
| CN110080739B (en) | Method for judging construction site of vertical well multi-branch fracture | |
| CN113356826A (en) | Moderate sand adding and pressure increasing acid fracturing method for improving fracture-cavity reservoir transformation effect | |
| CN107292753A (en) | The evaluation method of Oil/gas Well fracturing effect | |
| CN108625838B (en) | Formation fracturing method | |
| CN117988801A (en) | Pressure fracturing site control method for Hechuan-whisker river crack development reservoir | |
| CN108625837B (en) | Formation fracturing method | |
| CN108625839B (en) | Formation fracturing method | |
| CN114135266A (en) | Efficient fracturing sand adding method based on water hammer effect | |
| CN110792418B (en) | Wellbore working fluid formula optimization method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |