CN115680584A - Method for quickly predicting shut-in casing pressure by using overflow medium as injection water of adjacent well - Google Patents
Method for quickly predicting shut-in casing pressure by using overflow medium as injection water of adjacent well Download PDFInfo
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Abstract
The invention relates to the technical field of petroleum drilling, in particular to a method for quickly predicting shut-in casing pressure by using an overflow medium to inject water into an adjacent well, which comprises the following steps: when the overflow is found, recording different times t i Forming a plurality of groups of overflow data groups; calculating the difference between the outlet density and the inlet density of the drilling fluid according to the overflow data in each overflow data group, and calculating the difference at t i Casing pressure P of pre-shut-in well at moment Sleeve i: when the difference value of the outlet density and the inlet density of the drilling fluid is within a preset range value, closing the well, stopping recording overflow data, and obtaining n pre-closed well casing pressures P according to calculation Sleeve i calculating shut-in casing pressure P Sleeve According to shut-in casing pressure P Sleeve And performing subsequent process construction. By the prediction method, the final shut-in casing pressure can be rapidly and accurately predicted only by collecting data on the ground, a large amount of valuable well killing disposal time can be saved for a drilling site, and data support is provided for the subsequent formulation of a well killing scheme.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a method for quickly predicting shut-in casing pressure of an adjacent well by using an overflow medium as injection water.
Background
In recent years, "first injection and then extraction" has become a main development mode of a plurality of oil extraction enterprises, with the continuous improvement of water injection amount and water injection scale, the complex problems of abnormal reservoir pressure of an oil area, simultaneous storage of reservoir water outlet and water outlet/leakage and the like generally exist, but no pressure measurement method while drilling exists in the current development mode, so that the well control risks of well drilling and later-stage fracturing modification are high, and how to quickly calculate the formation pressure and the required density of well killing liquid according to parameters such as liquid returning from a well head, well head casing pressure and well drilling and the like is of great importance.
The method for acquiring the wellhead casing pressure value adopted on site at present comprises the following steps: and (5) finding overflow or suspected overflow, and immediately closing the well. And after the well is shut down, slowly raising the wellhead casing pressure value to a stable value. If the casing pressure value is larger than the maximum allowable casing pressure for closing the well, the throttling circulation is required to be continuously carried out so as to avoid damaging wellhead equipment or leaking the stratum. In this process, valuable kill time is delayed, as little as 30 minutes and as much as 5-6 hours.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for quickly predicting the shut-in casing pressure of the adjacent well injected with water by an overflow medium, the final shut-in casing pressure can be quickly and accurately predicted only by ground collected data, a large amount of valuable well killing treatment time can be saved for a drilling field, and data support is provided for the subsequent formulation of a well killing scheme.
The invention is realized by adopting the following technical scheme:
a method for quickly predicting shut-in casing pressure of an adjacent well by using an overflow medium as injection water is characterized by comprising the following steps of: the method comprises the following steps:
when the overflow is found, recording different times t i Forming a plurality of groups of overflow data groups according to the overflow data; wherein i =1, 2, 3 \8230, 8230n, t n The overflow data set formed at the moment is the last overflow data set before closing the well;
calculating the difference between the drilling fluid outlet density and the drilling fluid inlet density according to the overflow data in each overflow data group, and calculating the difference at t i Casing pressure P of pre-shut-in well at moment Sleeve i：
P Sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Sleeve i is t i Pre-closing well casing pressure at a moment; p is a radical of formula i Is t i Annular pressure at the wellhead at that moment; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Drilling fluid outlet density at time, Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow of time period; mu.s w Viscosity of annular fluid for leak-off, d is leak-off point length, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point;
when the difference value of the outlet density and the inlet density of the drilling fluid is within a preset range value, closing the well, stopping recording overflow data, and obtaining n pre-closed well casing pressures P according to calculation Sleeve i calculating the casing pressure P of shut-in well Sleeve ：
P Sleeve ＝(P Sleeve 1+P Sleeve 2+P Sleeve 3+……+P Sleeve n)ψ
Wherein psi is a correction coefficient and a constant;
according to shut-in casing pressure P Sleeve And performing subsequent process construction.
According to shut-in casing pressure P Sleeve The concrete steps of the subsequent process construction are as follows: if P Sleeve The maximum allowable well closing casing pressure is not less than the maximum allowable well closing casing pressure, and a throttling circulating well killing process is carried out; if P Sleeve The well closing and casing pressure is allowed to the maximum extent, and the well killing construction is carried out.
When P is present Sleeve And (4) calculating the corresponding kill drilling fluid density according to the calculated shut-in casing pressure, and organizing kill construction.
The preset range value is 0.01-0.02g/cm 3 。
The flooding data includes drilling parameters and drilling fluid performance parameters.
The drilling parameters include an inlet density, an outlet density, an inlet flow rate, and an outlet flow rate.
The drilling fluid performance parameters include density, funnel viscosity, plastic viscosity, apparent viscosity, dynamic shear force, static shear force, fluidity index, and consistency coefficient.
Respectively recording different momentst i The overflow data of (c) specifically refer to: a set of flooding data was recorded every 2 minutes prior to shut-in.
The pre-shut-in casing pressure P Sleeve The specific calculation method of i comprises the following steps:
calculating the formation pressure P during normal drilling 0 ：
P 0 ＝ρ×g×h+P △
Wherein rho is the density of the drilling fluid at the inlet during normal drilling; h is the vertical depth of the overflow layer, P △ The circulating pressure loss is realized;
according to a shaft continuous equation, a momentum conservation theorem and a Bernoulli equation, and then according to the total overflow amount and Darcy's law, establishing a shaft continuous flow equation:
P pressure difference ＝P Formation of earth -P Downhole ＝(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Pressure difference Is the pressure difference between the formation and the annulus, P Formation of earth Pore pressure, P, of the formation at the point of leak-off Downhole Is the bottom hole pressure; said Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow at the time of the time period; mu.s w Viscosity of the annular fluid lost into the annulus, d is the length of the lost circulation point, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point;
according to Bernoulli's principle, because the drilling rod entry is the same with the annular space casing pressure position, and when closing the well, the drilling rod is interior, the interior velocity of flow of annular space is zero, and the entry velocity of flow equals 0 with the exit velocity of flow, then there is the conservation of momentum relation of entire system:
p i +ρ i gh＝(Q i+1 -Q i )μ w d/k ground (floor) A Leakage net +P Sleeve i+ρ i+1 gh
Said p is i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Drill for timeWell fluid outlet density;
therefore, the method comprises the following steps:
P sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net 。
The method comprises the following steps of establishing a shaft continuous flow equation according to a shaft continuous equation, a momentum conservation theorem and a Bernoulli equation and then according to the total overflow amount and the Darcy's law, and specifically comprises the following steps:
the wellbore continuity equation is:
Q＝V1A1＝V2A2＝V3A3＝……
wherein Q is a flow rate, V1, V2, and V3.. Are annular flow velocities at different times, respectively, and A1, A2, and a3.... Are annular cross-sectional areas at different times, respectively;
separately calculate t 1 To t 2 Outlet overflow, t, of time segment 2 To t 3 Outlet overflow, t, of time segment 3 To t 4 The overflow amount of the outlet of the time period is analogized in turn;
the law of conservation of momentum is:
m1v1+m2v2+...＝m1v1'+m2v2'+...
wherein m1 and m2 8230are annular drilling fluid mass at different moments respectively, v1 and v2 8230are drilling fluid outlet flow velocity at different moments respectively, v1 'and v2' \8230aredrilling fluid inlet flow velocity at different moments respectively;
in the drilling process, the annulus is in an open state, so that the flowing pressure at the orifice of the annulus is atmospheric pressure; according to the bernoulli equation:
wherein rho is the density of the drilling fluid outlet, and v is the flow velocity of the drilling fluid outlet; p g ＝P Pressure difference +P Sleeve ，P g Atmospheric pressure, P, at the annulus wellhead Pressure difference Is the pressure difference between the formation and the annulus, P Sleeve Closing the well and casing pressure;
therefore:
deducing the pressure difference P between the stratum and the annular space according to the overflow quantity and Darcy's law Pressure difference Comprises the following steps:
P pressure difference ＝P Formation of earth -P Downhole ＝(Q i+1 -Q i )μ w d/k Ground A Leakage net 。
Compared with the prior art, the invention has the beneficial effects that:
1. the method only aims at the single flow under the condition that the stratum overflows and produces water, can quickly predict and calculate the magnitude of the shut-in casing pressure, and does not need to wait for observation to waste time. Compared with the currently commonly adopted method of closing the well and observing the casing pressure value, the method has the greatest advantages of saving precious overflow disposal time, providing suggestions and suggestions for overflow disposal, reducing the field labor intensity and improving the well control risk control capability.
2. In the invention, a plurality of groups of data are respectively used for calculating the pre-shut-in casing pressure, and the pre-shut-in casing pressure can be corrected to obtain the shut-in casing pressure, so that the calculation accuracy is high.
Detailed Description
Example 1
As a basic implementation mode of the invention, the invention comprises a method for quickly predicting the shut-in casing pressure of an adjacent well by using an overflow medium as injection water, which comprises the following steps:
when the overflow is found, recording different times t i Forming a plurality of groups of overflow data groups. Wherein i =1, 2, 3 \8230, 8230n, t n And the overflow data set formed at the moment is the last overflow data set before the well is shut-in.
Calculating the difference between the outlet density and the inlet density of the drilling fluid according to the overflow data in each overflow data group, and calculating the difference at t i Casing pressure P of pre-shut-in well at moment Sleeve i：
P Sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Sleeve i is t i Pre-closing well casing pressure at a moment; p is a radical of i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Drilling fluid outlet density at time, Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total amount of overflow over a period of time; mu.s w Viscosity of the annular fluid lost into the annulus, d is the length of the lost circulation point, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point.
When the difference value of the outlet density and the inlet density of the drilling fluid is within a preset range value, closing the well, stopping recording overflow data, and according to the casing pressure P of the pre-closed well Sleeve i calculating the casing pressure P of shut-in well Sleeve ：
P Sleeve ＝(P Sleeve 1+P Sleeve 2+P Sleeve 3+……+P Sleeve n)ψ
Where ψ is a correction coefficient, constant.
According to shut-in casing pressure P Sleeve And performing subsequent process construction.
Example 2
As a preferred embodiment of the present invention, the present invention includes a method for rapidly predicting the casing pressure of a shut-in well in which an overflow medium is injected into an adjacent well, comprising the following steps:
when the overflow is found, recording different times t i Forming a plurality of groups of overflow data groups. Wherein i =1, 2, 3 \8230, 8230n, t n And the overflow data set formed at the moment is the last overflow data set before the well is shut-in. The flooding data includes drilling parameters and drilling fluid performance parameters. The drilling parameters include an inlet density, an outlet density, an inlet flow rate, and an outlet flow rate. The properties of the drilling fluid at the inlet and the outlet comprise density, funnel viscosity, plastic viscosity, apparent viscosity, dynamic shear force, static shear force, fluidity index and consistency coefficient.
According toCalculating the difference between the outlet density and the inlet density of the drilling fluid according to the overflow data in each overflow data group, and calculating the difference at t i Casing pressure P of pre-shut-in well at moment Sleeve i：
P Sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground (floor) A Leakage net
Wherein, P Sleeve i is t i Pre-closing well casing pressure at a moment; p is a radical of i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Outlet density of drilling fluid at time, Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total amount of overflow over a period of time; mu.s w Viscosity of the annular fluid lost into the annulus, d is the length of the lost circulation point, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point.
When the difference value of the outlet density and the inlet density of the drilling fluid is within a preset range value, closing the well, stopping recording overflow data, and according to the casing pressure P of the pre-closed well Sleeve i calculating the casing pressure P of shut-in well Sleeve ：
P Sleeve ＝(P Sleeve 1+P Sleeve 2+P Sleeve 3+……+P Sleeve n)ψ
Where ψ is a correction coefficient, constant.
According to shut-in casing pressure P Sleeve And (3) performing subsequent process construction: if P Sleeve The maximum allowable well closing casing pressure is not less than the maximum allowable well closing casing pressure, and a throttling circulating well killing process is carried out; if P Sleeve And (3) the maximum allowable shut-in casing pressure is less than, according to the predicted shut-in casing pressure, calculating the corresponding kill drilling fluid density, and organizing kill construction.
Example 3
As a best implementation mode, the invention comprises a method for quickly predicting the casing pressure of a shut-in well with overflow media used for injecting water into an adjacent well, and the method comprises the following steps:
when overflow is found, the interval is 2 minutes before shutting down the wellThe clock records a group of overflow data at different times t i The overflow data of (a) form a plurality of groups of overflow data sets and specify the highest allowable shut-in casing pressure. Wherein i =1, 2, 3 \8230, 8230n, t n And the overflow data set formed at the moment is the last overflow data set before the well is shut-in.
The flooding data includes drilling parameters and drilling fluid performance parameters. The drilling parameters include total overflow, circulating pump pressure, inlet density, outlet density, inlet flow rate, outlet flow rate, vertical depth when overflow occurs, and drilling tool size. The drilling fluid performance parameters include density, funnel viscosity, plastic viscosity, apparent viscosity, dynamic shear force, static shear force, fluidity index, and consistency coefficient. The drilling fluid performance parameters can be used for determining correction coefficients, the drilling fluid performance can be influenced by formation overflow water, and the larger the performance change is, the more overflow water is proved, and vice versa.
Calculating the difference between the outlet density and the inlet density of the drilling fluid according to the overflow data in each overflow data group, and calculating the difference at t i Casing pressure P for pre-closing well at moment Sleeve i：
P Sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Sleeve i is t i Pre-closing well casing pressure at a moment; p is a radical of formula i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Drilling fluid outlet density at time, Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow of time period; mu.s w Viscosity of annular fluid for leak-off, d is leak-off point length, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point. The length of the overflow point and the cross-sectional area of the leakage point are dynamic change data, and can be obtained from logging data by combining formation data, and the permeability of the formation at the leakage point is a known formation parameter numberAccordingly.
When the difference value between the outlet density and the inlet density of the drilling fluid is within a preset range value, namely the difference value is between 0.01 and 0.02g/cm 3 And when the overflow data is within the range of (1), closing the well and stopping recording the overflow data. And n pre-shut-in casing pressures P are obtained according to calculation Sleeve i calculating the casing pressure P of shut-in well Sleeve ：
P Sleeve ＝(P Sleeve 1+P Sleeve 2+P Sleeve 3+……+P Sleeve n)ψ
Where ψ is a correction coefficient, constant. The determination of psi needs to be determined taking into account the injection pressure near the injection well, the amount of data collected during flooding, the amount of outlet drilling fluid performance change and an additional safety factor, which may be 120% of the predicted pressure.
According to shut-in casing pressure P Sleeve And performing subsequent process construction. More specifically, if P Sleeve Not less than the maximum allowable well shut-in casing pressure, and adding 0.02g/cm according to the corresponding density of the well shut-in casing pressure configuration 3 The weighted drilling fluid is subjected to a throttling circulating well killing process; if P Sleeve The maximum allowable shut-in casing pressure is provided with corresponding density of 0.02g/cm according to the calculated shut-in casing pressure 3 The weighted drilling fluid is used for killing the well, and the killing mode is selected according to field equipment and field conditions.
In this embodiment, the pre-shut-in casing pressure P Sleeve The specific calculation process of i comprises the following steps:
calculating the formation pressure P during normal drilling 0 ：
P 0 ＝ρ×g×h+P △
Wherein rho is the density of drilling fluid at an inlet in g/cm during normal drilling 3 (ii) a h is the vertical depth of the overflow layer, m, P △ Is the circulating pressure loss, MPa.
And establishing a shaft continuous flow equation according to a shaft continuous equation, a momentum conservation theorem and a Bernoulli equation and then according to the total overflow amount and Darcy's law.
The wellbore continuity equation is:
Q＝V1A1＝V2A2＝V3A3＝……
wherein, Q is flow, V1, V2 and V3.. Are the annular flow velocity at different moments respectively, and A1, A2 and A3.. Are the annular cross-sectional area at different moments respectively;
separately calculate t 1 To t 2 Outlet overflow, t, of time segment 2 To t 3 Outlet overflow, t, of time segment 3 To t 4 The overflow amount of the outlet of the time period is analogized in turn;
the law of conservation of momentum is as follows:
m1v1+m2v2+...＝m1v1'+m2v2'+...
wherein m1 and m2 8230are the annular drilling fluid mass at different moments, v1 and v2 8230are the drilling fluid outlet flow velocity at different moments; v1 'and v2' \ 8230, respectively the drilling fluid inlet flow rates at different moments;
in the drilling process, the annulus is in an open state, so that the flow pressure at the well mouth of the annulus is atmospheric pressure; according to the bernoulli equation:
wherein rho is the density of the drilling fluid outlet, and v is the flow velocity of the drilling fluid outlet; p is g Atmospheric pressure, P, at the annulus wellhead g ＝P Pressure difference +P Sleeve ，P Pressure difference Is the pressure difference between the formation and the annulus, P Sleeve The well is closed and the casing pressure is applied.
Therefore, the method comprises the following steps:
deducing the pressure difference P between the stratum and the annular space according to the overflow amount and Darcy's law Pressure difference Comprises the following steps:
P pressure difference ＝P Formation of earth -P Downhole ＝(Q i+1 -Q i )μ w d/k Ground A Leakage net 。
Wherein, P Formation of earth Pore pressure, P, of the formation at the point of leak-off Downhole Is a wellA bottom pressure; said Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow at time of the time period; mu.s w Viscosity of annular fluid for leak-off, d is leak-off point length, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point.
According to Bernoulli's principle, because the drilling rod inlet is the same as the annular casing pressure position, and the flow velocity in the drilling rod and the annular casing is zero when the well is closed, namely the inlet flow velocity and the outlet flow velocity are equal to 0, then there is the conservation of momentum relation of the whole system:
p i +ρ i gh＝(Q i+1 -Q i )μ w d/k ground A Leakage net +P Sleeve i+ρ i+1 gh
Said p is i Is t i Annular pressure at the wellhead at that moment; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 The drilling fluid outlet density at the moment;
therefore:
P sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net 。
In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.
Claims (10)
1. A method for quickly predicting shut-in casing pressure of an adjacent well injected with water by an overflow medium is characterized by comprising the following steps of: the method comprises the following steps:
when the overflow is found, recording different times t i Forming a plurality of groups of overflow data groups according to the overflow data; wherein i =1, 2, 3 \8230, 8230n, t n The overflow data set formed at the moment is the last overflow data set before closing the well;
according to overflow in each overflow data groupFlow data, calculating the difference between the outlet density and the inlet density of the drilling fluid, and calculating the difference at t i Casing pressure P for pre-closing well at moment Sleeve i：
P Sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Sleeve i is t i Pre-closing the well and casing pressure at the moment; p is a radical of i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 Drilling fluid outlet density at time, Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow of time period; mu.s w Viscosity of annular fluid for leak-off, d is leak-off point length, k Ground Formation permeability at the leak-off point, A Leakage net The cross-sectional area of the drop-out point;
when the difference value of the outlet density and the inlet density of the drilling fluid is within a preset range value, closing the well, stopping recording overflow data, and obtaining n pre-closed well casing pressures P according to calculation Sleeve i calculating the casing pressure P of shut-in well Sleeve ：
P Sleeve ＝(P Sleeve 1+P Sleeve 2+P Sleeve 3+……+P Sleeve n)ψ
Wherein psi is a correction coefficient and a constant;
according to shut-in casing pressure P Sleeve And performing subsequent process construction.
2. The method for rapidly predicting the shut-in casing pressure of the adjacent well injected with water by the overflow medium according to claim 1, characterized by comprising the following steps: according to shut-in casing pressure P Sleeve The concrete steps of the subsequent process construction are as follows: if P Sleeve The maximum allowable well closing casing pressure is not less than the maximum allowable well closing casing pressure, and a throttling circulating well killing process is carried out; if P Sleeve And (3) closing the well and casing pressure to the maximum extent, and performing well killing construction.
3. An overflow as claimed in claim 2The method for quickly predicting the casing pressure of the shut-in well with the medium as the injected water of the adjacent well is characterized by comprising the following steps of: when P is present Sleeve And (3) the maximum allowable shut-in casing pressure, calculating the corresponding kill drilling fluid density according to the calculated shut-in casing pressure, and organizing kill construction.
4. The method for rapidly predicting the shut-in casing pressure of the adjacent well injected with water by the overflow medium according to claim 1, characterized by comprising the following steps: the preset range value is 0.01-0.02g/cm 3 。
5. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to the claim 1 or 2, is characterized in that: the flooding data includes drilling parameters and drilling fluid performance parameters.
6. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to claim 5, wherein the method comprises the following steps: the drilling parameters include an inlet density, an outlet density, an inlet flow rate, and an outlet flow rate.
7. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to claim 5, wherein the method comprises the following steps: the drilling fluid performance parameters include density, funnel viscosity, plastic viscosity, apparent viscosity, dynamic shear force, static shear force, fluidity index, and consistency coefficient.
8. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to claim 1, wherein the method comprises the following steps: respectively recording different times t i The overflow data of (c) specifically refer to: a set of flooding data was recorded every 2 minutes prior to shut-in.
9. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to claim 1, wherein the method comprises the following steps: the pre-shut-in casing pressure P Sleeve The specific calculation method of i comprises the following steps:
calculating normal drilling timeFormation pressure P 0 ：
P 0 ＝ρ×g×h+P △
Wherein rho is the density of the drilling fluid at the inlet during normal drilling; h is the vertical depth of the overflow layer, P △ The circulating pressure loss is realized; according to a shaft continuous equation, a momentum conservation theorem and a Bernoulli equation, and then according to the total overflow amount and Darcy's law, establishing a shaft continuous flow equation:
P pressure difference ＝P Formation of earth -P Downhole ＝(Q i+1 -Q i )μ w d/k Ground A Leakage net
Wherein, P Pressure difference Is the pressure difference between the formation and the annulus, P Formation of earth Pore pressure, P, of the formation at the point of leak-off Downhole Bottom hole pressure; said Q i+1 Is t i+1 To t i+2 Total amount of overflow of time period, Q i Is t i To t i+1 Total overflow at time of the time period; mu.s w Viscosity of annular fluid for leak-off, d is leak-off point length, k Ground To leak-off point formation permeability, A Leakage net The cross-sectional area of the drop-out point;
according to Bernoulli's principle, because the drilling rod entry is the same with the annular space casing pressure position, and when closing the well, the drilling rod is interior, the interior velocity of flow of annular space is zero, and the entry velocity of flow equals 0 with the exit velocity of flow, then there is the conservation of momentum relation of entire system:
p i +ρ i gh＝(Q i+1 -Q i )μ w d/k ground (floor) A Leakage net +P Sleeve i+ρ i+1 gh
Said p is i Is t i Annular pressure at the wellhead at that time; h is the vertical depth of the overflow layer, rho i Is t i Drilling fluid outlet density at time, p i+1 Is t i+1 The drilling fluid outlet density at that moment;
therefore, the method comprises the following steps:
P sleeve i＝p i +(ρ i -ρ i+1 )gh-(Q i+1 -Q i )μ w d/k Ground (floor) A Leakage net 。
10. The method for rapidly predicting the shut-in casing pressure of the overflow medium for injecting water into the adjacent well according to claim 9, wherein the method comprises the following steps: the method comprises the following steps of establishing a shaft continuous flow equation according to a shaft continuous equation, a momentum conservation theorem and a Bernoulli equation and then according to the total overflow amount and Darcy's law, and specifically comprises the following steps:
the wellbore continuity equation is:
Q＝V1A1＝V2A2＝V3A3＝……
wherein, Q is flow, V1, V2 and V3.. Are the annular flow velocity at different moments respectively, and A1, A2 and A3.. Are the annular cross-sectional area at different moments respectively;
separately calculate t 1 To t 2 Outlet overflow, t, of time segment 2 To t 3 Outlet overflow, t, of time segment 3 To t 4 The overflow amount of the outlet of the time period is analogized in turn;
the law of conservation of momentum is:
m1v1+m2v2+...＝m1v1'+m2v2'+...
wherein m1 and m2 8230are annular drilling fluid mass at different moments respectively, v1 and v2 8230are drilling fluid outlet flow velocity at different moments respectively, v1 'and v2' \8230aredrilling fluid inlet flow velocity at different moments respectively;
in the drilling process, the annulus is in an open state, so that the flow pressure at the well mouth of the annulus is atmospheric pressure; according to the bernoulli equation:
wherein rho is the density of the drilling fluid outlet, and v is the flow velocity of the drilling fluid outlet; p g ＝P Pressure difference +P Sleeve ，P g Atmospheric pressure, P, experienced at the annulus wellhead Pressure difference Is the pressure difference between the formation and the annulus, P Sleeve Closing the well and casing pressure;
therefore, the method comprises the following steps:
deducing the pressure difference P between the stratum and the annular space according to the overflow quantity and Darcy's law Pressure difference Comprises the following steps:
P pressure difference ＝P Formation of earth -P Downhole ＝(Q i+1 -Q i )μ w d/k Ground A Leakage net 。
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