CN112943215A - Method for selecting horizontal well from water direction by monitoring and judging oil reservoir pressure response - Google Patents
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Abstract
The invention provides a method for selecting a horizontal well in an inflow direction by monitoring and judging oil reservoir pressure response, which comprises the following specific steps: selecting a fractured water-breakthrough horizontal well and determining the flowing pressure of the water injection well; determining the bottom hole flowing pressure of the oil production well; step three, solving the formation pressure of the well point; step four, regarding the oil reservoir injection and production system as a series of communication units among wells, determining the flow capacity of the communication fractures and the material basis of the communication fractures, establishing a calculation model according to the material balance principle, and solving the flow conductivity of each communication unit; selecting a water injection well with the flow conductivity higher than the block average flow conductivity as a test well, and performing subsequent profile control; water injection wells near and below the block average conductivity value are not tested. The method provided by the invention has the advantages that the measure testing range is reduced, the coincidence rate is improved, the water drive dominant direction and rule among water wells with low permeability reservoir fracture are effectively judged, and a basis is provided for the source treatment of the horizontal well.
Description
Technical Field
The invention belongs to the technical field of petroleum industry, and particularly relates to a method for selecting a horizontal well from an inflow direction by monitoring and judging the pressure response of an oil reservoir.
Background
At present, the water inflow direction of a high-water-cut horizontal well of an oil field is mainly determined by means of dynamic verification, dynamic monitoring and production profile testing of a water injection well, and a well selection method mainly comprises a system analysis well selection method, a multiple linear regression model well selection method and a fuzzy comprehensive judgment well selection decision method model. The system analysis well selection method model has certain difference in calculation results for the condition that a well is opened and closed, the model only considers the change of bottom hole flowing pressure at the production well end, and the calculation needs to iterate for many times and solve a huge linear equation set, so that the calculation is relatively complex; the multiple linear regression model well selection method mainly adapts to oil reservoirs with good permeability, the bottom flowing pressure of a production well in a fitting verification time period is assumed to be a fixed value, and the bottom flowing pressure fluctuation condition of the production well is not considered. These methods all have some disadvantages and are not widely used.
Disclosure of Invention
In order to overcome the problems that the existing low-permeability fractured reservoir pressure response monitoring and judging horizontal well incoming water direction well selection is not strong in pertinence and low in load rate, and data difference caused by flow pressure fluctuation at the bottom of a production well is not considered, the invention provides a method for monitoring and judging the incoming water direction well selection of the horizontal well by reservoir pressure response.
The technical scheme adopted by the invention is as follows:
a method for selecting a horizontal well in an inflow direction by monitoring and judging oil reservoir pressure response comprises the following specific steps:
selecting a fractured water-breakthrough horizontal well and determining the flowing pressure of the water injection well;
determining the bottom hole flowing pressure of the oil production well;
step three, solving the formation pressure of the well point;
step four, regarding the oil reservoir injection and production system as a series of communication units among wells, determining the flow capacity of the communication fractures and the material basis of the communication fractures, establishing a calculation model according to the material balance principle, and solving the flow conductivity of each communication unit;
selecting a water injection well with the flow conductivity higher than the block average flow conductivity as a test well, and performing subsequent profile control; water injection wells near and below the block average conductivity value are not tested.
In the first step, the casing pressure of each water injection well around the connected area or block is measured, the density of injected water and the medium depth of an oil layer are measured, and the flowing pressure of the water injection well is determined.
In the first step, the flowing pressure of the water injection well is as follows:
Pflow pressure of water injection well＝PCasing pressure of water injection well+ρDensity of injected waterghDepth in oil layer of water injection well/1000。
And in the second step, the casing pressure and the working fluid level of the oil production well are tested to determine the flow pressure of the oil production well.
In the second step, the bottom hole flowing pressure of the oil well:
Pflow pressure of oil production well＝POil well casing pressure+PPressure of gas column+PPressure of oil column+POil-water mixture pressureForce of。
In the third step, the well point stratum pressure is calculated as follows: and establishing a relation between the deep flowing pressure in the oil reservoir and the formation pressure at the well point, calculating the bottom flowing pressure according to the working fluid level, and then solving a corresponding formation pressure value according to a relational expression of the bottom flowing pressure, the average formation pressure in the oil drainage area and the deep flowing pressure in the oil reservoir.
In the fourth step, the establishment of the calculation model based on the material balance principle comprises the following steps: production-injection-change.
In the fourth step, the basis of communicating the fracture substances is the control volume.
In the fourth step, the oil deposit injection and production system is regarded as a series of communicated units among wells, TijThe flow capacity between the ith well and the jth well; vpijIs a material basis between the ith well and the jth well; the flow conductivity T between the ith well and the jth well is calculatedji；
Wherein n is the number of water injection wells, PiIs the average formation pressure of the drainage zone of the ith well, PjMean formation pressure, Q, of drainage zone of jth welljThe flow rate of the jth well, injection positive, production negative, CtFor the overall compression factor, t is the production time, and α is the unit conversion factor, which takes the value of 0.0864, KijIs the average permeability between the ith and jth wells, AijIs the average cross-sectional area of seepage between the ith and jth wells, μ is the fluid viscosity, LijThe well spacing of the oil production well i and the water injection well j.
And i and j are well serial numbers, wherein i is a production well, and j is a water injection well.
The invention has the beneficial effects that:
according to the method, the wells are selected according to the diversion rate calculation results on different flow units, and then the incoming water direction judgment test is carried out by adopting the pressure excitation judgment incoming water direction process, so that a specific test well is obtained.
The invention can reflect the actual communication condition between oil-water wells in real time, effectively represent the formation parameters between wells, also consider the change condition of the bottom flowing pressure of the oil-water well, and verify the reliability of the calculation result by fitting the flowing pressure of the production well.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a simplified connected element model.
FIG. 2 is a flow chart of model calculation.
Detailed Description
Example 1:
in order to overcome the problems that the existing low-permeability fractured reservoir pressure response monitoring and judging horizontal well incoming water direction well selection pertinence is not strong, the load rate is low, and data difference caused by flow pressure fluctuation at the bottom of a production well is not considered, the invention provides a method for selecting a well in the incoming water direction of the reservoir pressure response monitoring and judging horizontal well as shown in figures 1 and 2.
A method for selecting a horizontal well in an inflow direction by monitoring and judging oil reservoir pressure response comprises the following specific steps:
selecting a fractured water-breakthrough horizontal well and determining the flowing pressure of the water injection well;
determining the bottom hole flowing pressure of the oil production well;
step three, solving the formation pressure of the well point;
step four, regarding the oil reservoir injection and production system as a series of communication units among wells, determining the flow capacity of the communication fractures and the material basis of the communication fractures, establishing a calculation model according to the material balance principle, and solving the flow conductivity of each communication unit;
selecting a water injection well with the flow conductivity higher than the block average flow conductivity as a test well, and performing subsequent profile control; water injection wells near and below the block average conductivity value are not tested.
The invention relates to a method for selecting a well in the water-entering direction of a horizontal well by monitoring and judging the pressure response of a low-permeability fractured reservoir, which further reduces the measure testing range, improves the coincidence rate, effectively judges the water-flooding dominant direction and rule among low-permeability reservoir fractured water-entering wells and provides a basis for the source treatment of the horizontal well. The invention introduces conductivity and control volume to provide a flow pressure fitting verification well selection decision method, performs well selection according to the flow conductivity calculation results on different flow units, and then performs incoming water direction identification test by adopting a pressure excitation identification incoming water direction process to obtain a specific test well.
According to the invention, a corresponding model is established through a material balance principle, the obtained flow conductivity is calculated, the water injection well with the flow conductivity lower than the block average flow conductivity is selected as a test well, the water injection well with the flow conductivity near the block average flow conductivity and the water injection well with the flow conductivity lower than the block average flow conductivity is not tested, and the calculation speed is high. The method provided by the invention has the advantages that the measure testing range is reduced, the coincidence rate is improved, the water drive dominant direction and rule among water wells with low permeability reservoir fracture are effectively judged, and a basis is provided for the source treatment of the horizontal well.
Example 2:
based on embodiment 1, in this embodiment, preferably, in the step one, the casing pressure of each water injection well around the connected region or block, the density of the injected water and the depth in the oil layer are measured, and the flow pressure of the water injection well is determined.
Preferably, in the first step, the flow pressure of the water injection well is:
Pflow pressure of water injection well＝PCasing pressure of water injection well+ρDensity of injected waterghDepth in oil layer of water injection well/1000。
Preferably, in the second step, the casing pressure and the working fluid level of the production well are tested to determine the flow pressure of the production well.
Preferably, in the second step, the bottom hole flowing pressure of the oil well is:
Pflow pressure of oil production well＝POil well casing pressure+PPressure of gas column+PPressure of oil column+PPressure of oil-water mixture。
Preferably, in the third step, the well point formation pressure is determined as follows: and establishing a relation between the deep flowing pressure in the oil reservoir and the formation pressure at the well point, calculating the bottom flowing pressure according to the working fluid level, and then solving a corresponding formation pressure value according to a relational expression of the bottom flowing pressure, the average formation pressure in the oil drainage area and the deep flowing pressure in the oil reservoir.
Preferably, in the fourth step, the material balance principle establishment calculation model is as follows: production-injection-change.
Preferably, in the fourth step, the basis of the connected fracture substances is controlled volume.
Preferably, in the fourth step, the oil reservoir injection and production system is regarded as a series of communication units among wells, TijThe flow capacity between the ith well and the jth well; vpijIs a material basis between the ith well and the jth well; the flow conductivity T between the ith well and the jth well is calculatedji；
Wherein n is the number of water injection wells, PiIs the average formation pressure of the drainage zone of the ith well, PjMean formation pressure, Q, of drainage zone of jth welljThe flow rate of the jth well, injection positive, production negative, CtFor the overall compression factor, t is the production time, and α is the unit conversion factor, which takes the value of 0.0864, KijIs the average permeability between the ith and jth wells, AijIs the average cross-sectional area of seepage between the ith well and the jth wellμ is the fluid viscosity, LijThe well spacing of the oil production well i and the water injection well j.
Preferably, i and j are well numbers, wherein i is a production well and j is a water injection well.
The invention provides a flow pressure fitting verification well selection decision method by introducing conductivity, namely flow conductivity and control volume, performs well selection according to the calculation results of the flow conductivity T on different flow units, and then performs incoming water direction identification test by adopting a pressure excitation identification incoming water direction process to obtain a specific test well.
The specific implementation process of the invention is as follows:
testing casing pressure of each water injection well around the selected fractured water-breakthrough horizontal well in the block, measuring the density of injected water and the depth in an oil layer, and calculating the flowing pressure of the water injection well; testing the casing pressure and the working fluid level of the oil production well, calculating the flow pressure of the oil production well, and solving the formation pressure of a well point; the oil deposit injection and production system is regarded as a series of communication units among wells, and the communication units have flow capacity and material foundation. Establishing a corresponding model by a substance balance principle, calculating the diversion rate T,
firstly, establishing a physical model of a flow pressure inversion fitting well selection decision method, regarding an oil deposit injection and production system as a series of well-to-well communication units, wherein each communication unit has two characteristic parameters: flow rate of conduction TjiAnd a control volume Vpji. Flow rate of conduction TjiThe larger the control volume, the more likely the cell will break through water under the same water drive pressure differential.
Establishing a mathematical model, and establishing a material balance equation according to the formation conditions for the ith well:
order to
And the implicit difference is performed on the formula (1) to obtain:
wherein i is an oil well, j is a water well, n is the number of water injection wells, alpha is a unit conversion coefficient, the value is 0.0864, K is the permeability, AijIs the average cross-sectional area of seepage between the ith and jth wells, μ is the fluid viscosity, LijThe well spacing of the oil production well i and the water injection well j is shown; piIs the average formation pressure of the drainage zone of the ith well, PjThe average formation pressure of an oil drainage area of the jth well; q flow rate, positive injection and negative production; cLIs the overall compression factor, L is the distance length; t is time, VpiIs the control volume of the ith well; kijIs the average permeability, T, between the ith and jth wellsijIs the flow capacity from the ith well to the jth well.
By using the above formulas (1) - (3) and combining the historical production data of the well group, the flow conductivity between any two wells in the well group can be obtained.
When considering production data for all wells in a well group, we can get:
in the formula:
Tji-conductivity between the ith and jth wells;
Aji-the controlled drainage area of the jth well between the ith well and the jth well;
Lji-the well spacing between the ith well and the jth well.
And calculating the flow conductivity of the water injection wells around the high-water-cut horizontal well by using a formula, screening out the test wells, selecting the water injection wells with the flow conductivity lower than the block average flow conductivity as the test wells, and not testing the water injection wells near the block average flow conductivity value and lower than the block average flow conductivity value.
The flow conductivity and control volume existing between the ith well and the jth well are shown in FIG. 1The number of wells is simplified. The conductivity at three wells is Tj1、Tj2And Tj3Control volume at three wells is Vpj1、Vpj2And Vpj. In the subsequent calculation, according to the conductivity and the control volume, screening out the test wells through a series of calculation and selection, selecting the water injection wells with conductivity lower than the block average conductivity as the test wells, and not testing the water injection wells near the block average conductivity and lower than the block average conductivity.
Finally, it should be noted that the above examples are only intended to illustrate the technical embodiments of the method and not to limit the invention, and although the invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the invention without departing from the spirit and scope of the technical solution of the invention, which should be covered by the claims of the invention. The method modules and the calculation models described in detail in the present invention are prior art, and will not be further described in the present invention.
Claims (10)
1. A method for selecting a horizontal well from a water direction by monitoring and judging oil reservoir pressure response is characterized by comprising the following steps: the method comprises the following specific steps:
selecting a fractured water-breakthrough horizontal well and determining the flowing pressure of the water injection well;
determining the bottom hole flowing pressure of the oil production well;
step three, solving the formation pressure of the well point;
step four, regarding the oil reservoir injection and production system as a series of communication units among wells, determining the flow capacity of the communication fractures and the material basis of the communication fractures, establishing a calculation model according to the material balance principle, and solving the flow conductivity of each communication unit;
selecting a water injection well with the flow conductivity higher than the block average flow conductivity as a test well, and performing subsequent profile control; water injection wells near and below the block average conductivity value are not tested.
2. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the first step, the casing pressure of each water injection well around the connected area or block is measured, the density of injected water and the medium depth of an oil layer are measured, and the flowing pressure of the water injection well is determined.
3. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the first step, the flowing pressure of the water injection well is as follows:
Pflow pressure of water injection well＝PCasing pressure of water injection well+ρDensity of injected waterghDepth in oil layer of water injection well/1000。
4. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: and in the second step, the casing pressure and the working fluid level of the oil production well are tested to determine the flow pressure of the oil production well.
5. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the second step, the bottom hole flowing pressure of the oil well:
Pflow pressure of oil production well＝POil well casing pressure+PPressure of gas column+PPressure of oil column+PPressure of oil-water mixture。
6. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the third step, the well point stratum pressure is calculated as follows: and establishing a relation between the deep flowing pressure in the oil reservoir and the formation pressure at the well point, calculating the bottom flowing pressure according to the working fluid level, and then solving a corresponding formation pressure value according to a relational expression of the bottom flowing pressure, the average formation pressure in the oil drainage area and the deep flowing pressure in the oil reservoir.
7. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the fourth step, the establishment of the calculation model based on the material balance principle comprises the following steps: production-injection-change.
8. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the fourth step, the basis of communicating the fracture substances is the control volume.
9. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: in the fourth step, the oil deposit injection and production system is regarded as a series of communicated units among wells, TijThe flow capacity between the ith well and the jth well; vpijIs a material basis between the ith well and the jth well; the flow conductivity T between the ith well and the jth well is calculatedji；
Wherein n is the number of water injection wells, PiIs the average formation pressure of the drainage zone of the ith well, PjMean formation pressure, Q, of drainage zone of jth welljThe flow rate of the jth well, injection positive, production negative, CtFor the overall compression factor, t is the production time, and α is the unit conversion factor, which takes the value of 0.0864, KijIs the average permeability between the ith and jth wells, AijIs the average cross-sectional area of seepage between the ith and jth wells, μ is the fluid viscosity, LijThe well spacing of the oil production well i and the water injection well j.
10. The method for selecting a horizontal well according to the inflow direction of the reservoir pressure response monitoring and judging horizontal well, which is characterized by comprising the following steps of: and i and j are well serial numbers, wherein i is a production well, and j is a water injection well.
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| CN115288646A (en) * | 2021-12-22 | 2022-11-04 | 长江大学 | Connectivity analysis method, device, medium and terminal for fractured horizontal well |
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| CN115288646B (en) * | 2021-12-22 | 2024-05-03 | 长江大学 | Connectivity analysis method, device, medium and terminal for fracturing horizontal well |
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