CN115929279B - Plate analysis method for judging interference intensity under mining balance - Google Patents
Plate analysis method for judging interference intensity under mining balance Download PDFInfo
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Abstract
The invention discloses a plate analysis method for judging interference intensity under the balance of gas production, which comprises the following steps: collecting a bottom hole pressure parameter of an unconnected well, and preprocessing the parameter; calculating a pressure drop value according to the preprocessed bottom hole pressure parameter, and drawing a pressure drop curve plate under a double-logarithmic coordinate; and measuring and calculating the characteristic value of the pressure drop graph curve, and calculating the injection and production interference intensity. The plate analysis method for judging the interference intensity under the mining balance reduces the operation difficulty, only uses the pressure test data to determine the interference intensity, and does not need to use a special instrument; the application field of the interference well test plate in petroleum mining fields is expanded, and the applicability is wide; the invention can quantitatively obtain the injection and production interference yield under the injection and production balance by using algebraic calculation, reduces the data interpretation workload, improves the working efficiency, and has better effects on the aspects of operation difficulty, applicability and working efficiency.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a plate analysis method for judging interference intensity under the balance of gas injection and production.
Background
Strip reservoirs are commonly deposited in river channels and controlled karst reservoirs by breaking, and are mostly injection and production development modes of linear well rows. The oil-containing width of the breaking control karst reservoir is very narrow, the length of the reservoir is far greater than the width, and the production wells are arranged in a straight line along the fracture zone. The common production well distance is 1.5-3.0 km, the reservoir width is 0.7-1.2 km, and the single well control oil reservoir unit has typical strip characteristics. In the process of producing a disconnected solution oil reservoir, the yield of a production well is found to drop faster. The pressure test results indicated that 1/3 of the production well reservoir pressure had dropped to 70% of the original pressure. The comprehensive diagnosis result shows that: the reservoirs are mutually communicated and have complex structures, and the production interference phenomenon of adjacent wells cannot be ignored; pressure interference exists between the test well and the production well, but the source and the intensity of the interference pressure are not clear when a plurality of wells are produced simultaneously.
At present, the inter-well communication and inter-well interference analysis mainly comprises an interference well test analysis method. Early disturbance well testing was performed after the test well was shut in, and as the demand for oilfield production increases, disturbance testing without well shut in has been increasingly appreciated by mines. Thereafter, well intervention testing is also being developed for various production wells. While the well types considered by the various well-independent interference well test methods are more and more complex at present, the phenomenon of multi-well synchronous interference and interference among injection and production well groups is rarely considered. The well closing interference well testing plate is simple in operation, free of complicated calculation and fitting processes and wide in applicability, and can be used for identifying the interference intensity under the injection and production displacement condition.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above-described problems.
Therefore, the technical problems solved by the invention are as follows: the existing well-independent interference test method has the problems of low applicability, high operation difficulty, low working efficiency and incapability of simultaneously identifying the interference intensity under the injection and production displacement condition.
In order to solve the technical problems, the invention provides the following technical scheme: a plate analysis method for determining interference intensity under a balance of gas production, comprising:
collecting a bottom hole pressure parameter of an unconnected well, and preprocessing the parameter;
calculating a pressure drop value according to the preprocessed bottom hole pressure parameter, and drawing a pressure drop curve plate under a double-logarithmic coordinate;
and measuring and calculating the characteristic value of the pressure drop graph curve, and calculating the injection and production interference intensity.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the step of collecting the non-shut-in well bottom pressure parameters comprises the step of putting a pressure gauge into the bottom of an observation well, starting the non-shut-in well interference well test, and monitoring the bottom pressure data by the pressure gauge in real time.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the pre-processing of the parameters includes removing initial and final unbalanced bottom hole pressure data.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the step of calculating the pressure drop value according to the bottom hole pressure data comprises the step of calculating the pressure drop according to the bottom hole pressure meter time and the pressure data during the test.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the pressure drop, expressed as:
ΔT＝T-T 0
Δp w (Δt)＝|p w (T 0 )-p w (T)|
wherein P is w Is the bottom hole pressure; t (T) 0 Production time at the beginning of the well-out test; t is any production time during the well-out test.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the drawing of the pressure drop curve plate under the double logarithmic coordinates comprises the steps of drawing a double logarithmic pressure drop curve by taking test time as an abscissa value and pressure drop as an ordinate value.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: and calculating the characteristic value of the pressure drop graph curve, wherein calculating the injection and production interference intensity comprises the step of determining the type of an interference well according to the characteristic value of the curve, wherein the characteristic value of the curve is the numerical ratio of an actually measured pressure drop curve to an extrapolated pressure drop curve between straight line segments.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the numerical ratio D between the straight line segments of the measured pressure drop curve and the extrapolated pressure drop curve is expressed as:
wherein Δt is b Selecting any test time point for the second curve segment; Δp w (Δt b ) For the second curve segment delta t b Numerical values at;a second straight line segment delta t of the pressure drop curve which is the first curve segment b Extrapolated values at.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the type of the interference well is determined according to the curve characteristic value, and the relation between the curve characteristic value and the interference intensity is expressed as follows:
D＝2|Q D +1|
wherein Q is D The interference strength under interference is balanced for the injection.
As a preferred embodiment of the plate analysis method for determining interference intensity under the balance of the mining, the present invention comprises: the interference strength under the balanced interference of the injection and recovery is expressed as:
wherein Q is the test well yield and Q is the interference well yield;
when Q is D Judging the interference well as a production well according to the value of more than 0; when Q is D Judging the interference well as an injection well; at the balance of the production, the injection well has an injection quantity equal to the production of the production well, i.e. Σq D ＝0。
The invention has the beneficial effects that: the plate analysis method for judging the interference intensity under the mining balance reduces the operation difficulty, only uses the pressure test data to determine the interference intensity, and does not need to use a special instrument; the application field of the interference well test plate in petroleum mining fields is expanded, and the applicability is wide; the invention can quantitatively obtain the injection and production interference yield under the injection and production balance by using algebraic calculation, reduces the data interpretation workload, improves the working efficiency, and has better effects on the aspects of operation difficulty, applicability and working efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a general flow chart of a plate analysis method for determining disturbance intensity at a balance of a gas production according to an embodiment of the present invention;
FIG. 2 is a graph showing pressure drop at different disturbance intensities for a plate analysis method for determining disturbance intensities at a recovery balance according to a first embodiment of the present invention;
FIG. 3 is a graph of pressure drop profile characteristic values at different disturbance intensities for a profile analysis method for determining disturbance intensities at a recovery balance according to a first embodiment of the present invention;
FIG. 4 is a graph of pressure drop profile characteristic versus disturbance intensity for a profile analysis method for determining disturbance intensity at a balance of a gas production provided in accordance with a first embodiment of the present invention;
FIG. 5 is a schematic representation of a pressure drop pattern for identifying disturbance intensity of a gas injection balance according to a pattern analysis method for determining disturbance intensity under the gas injection balance according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram showing a closer example of a test well spacing production well for a pattern analysis method for determining disturbance intensity under a production balance according to a second embodiment of the present invention;
FIG. 7 is a graph showing a plot of a pressure drop curve of a near interval between production wells for a test of a plate analysis method for determining disturbance intensity under a production balance according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of a pattern analysis method for determining disturbance intensity under a production balance according to a second embodiment of the present invention;
FIG. 9 is a graph showing a plot of a pressure drop curve of a near interval between injection wells for a plate analysis method for determining disturbance intensity under a production balance according to a second embodiment of the present invention;
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-4, for one embodiment of the present invention, a plate analysis method for determining disturbance intensity at a fluid production balance is provided, comprising:
s1: collecting a bottom hole pressure parameter of an unconnected well, and preprocessing the parameter;
furthermore, collecting the non-shut-in bottom-hole pressure parameter comprises the step of putting a pressure gauge into the bottom of the observation well to start the non-shut-in interference well test, and the pressure gauge monitors bottom-hole pressure data in real time.
It should be noted that the preprocessing of the parameters includes removing the initial and final unbalanced bottom hole pressure data, i.e. the bottom hole pressure parameters are not closed to the well state and have been restored to the normal working state, so as to avoid the abnormal data caused by the change of the peripheral pressure when the manometer goes down or goes out of the well.
It should also be noted that, when recording the pressure drop, the first round recorded ten times per 0.001h, and the second round recorded ten times per 0.01h, each round being sequentially incremented.
S2: calculating a pressure drop value according to the preprocessed bottom hole pressure parameter, and drawing a pressure drop curve plate under a double-logarithmic coordinate;
further, calculating the pressure drop value from the bottom hole pressure data includes calculating the pressure drop based on the bottom hole pressure gauge time and the pressure data during the test.
Also to be described is:
the pressure drop, expressed as:
ΔT＝T-T 0
Δp w (Δt)＝|p w (T 0 )-p w (T)|
wherein P is w Is the bottom hole pressure; t (T) 0 Production time at the beginning of the well-out test; t is any production time during the well-out test.
Further, drawing the pressure drop curve plate under the double logarithmic coordinates comprises drawing the double logarithmic pressure drop curve by taking the test time as an abscissa value and the pressure drop as an ordinate value.
S3: and measuring and calculating the characteristic value of the pressure drop graph curve, and calculating the injection and production interference intensity.
It should be noted that the characteristic value of the curve is the numerical ratio between the measured pressure drop curve and the extrapolated pressure drop curve in the straight line section, and the type of the interference well can be determined according to the characteristic value of the curve.
Furthermore, the main source of the interference signal can be rapidly and qualitatively identified according to the pressure drop curve form of the semi-logarithmic graph, and if the test curve is a smooth continuous and conductive incremental curve, the main interference signal is from the production interference of the near-well production well; if the test curve has a dropped non-steerable point, then the dominant disturbance signal is from the injection disturbance of the near-well injection well.
It should also be noted that,
the numerical ratio D between the measured pressure drop curve and the extrapolated pressure drop curve between straight sections is expressed as:
wherein Δt is b Selecting any test time point for the second curve segment; Δp w (Δt b ) For the second curve segment delta t b Numerical values at;a second curve segment delta t of the pressure drop curve of the first curve segment b Extrapolated values at.
It should be noted that, as shown in FIG. 2, FIG. 3 shows the difference in Q D The distribution of the curves is judged according to the images drawn by the practical experimental data, and the D and Q can be known D There is a linear law, drawing D and Q D As can be seen from FIG. 4, the distribution is an absolute function symmetrical about the longitudinal axis-1 to obtain D and Q D Is a relation of (3).
It should also be noted that the relationship between the characteristic value of the curve and the interference intensity is expressed as:
D＝2|Q D +1|
wherein Q is D The interference strength under interference is balanced for the injection.
It should also be noted that only D and Q are relied upon D Only two interference intensities can be calculated according to the relation of (2), and Q can not be determined D ，
Thus, further, the interference strength at the balance of the injection and recovery interference is expressed as:
where Q is the test well yield and Q is the interference well yield.
It should also be noted that, based on the determination of the interference intensity, the type of the interference well: when Q is D Judging the interference well as a production well according to the value of more than 0; when Q is D Judging the interference well as an injection well; at the balance of the production, the injection well has an injection quantity equal to the production of the production well, i.e. Σq D ＝0。
It should also be noted that when the well is known as a production well or an injection well, the magnitude of the disturbance intensity can be directly determined, and the production well yield or the injection well injection amount can be calculated by using the disturbance intensity.
Example 2
Referring to fig. 5-9, for one embodiment of the present invention, a plate analysis method for determining interference intensity under the balance of injection and production is provided, and the present invention can be applied to well group test in which injection and production interference exists, and the type of oil reservoir or well group used can be: a strip reservoir deposited in the river channel, a fault block reservoir segmented by faults, and a huge thickness fault control karst reservoir; and (3) injecting water in rows under the square well network, injecting and extracting at five points and injecting and extracting at nine points. In order to verify the beneficial effects of the invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.
MATLAB and CloudSim were used to evaluate the algorithm. Simulations have been run in an environment with an Intel processor and 16GB RAM. The operating system used is 64-bit Windows 10. And simulating the point-to-point system by using MATLAB programming language, connecting records, and constructing data distribution.
As can be seen from fig. 5, two tests are performed, namely, a test well is close to a production well and a test well is close to a water injection well, the comparison group is a non-test well, the ratio of the change of the pressure drop to the change of the time is a fixed value under the condition of no interference of the test well, an inflection point appears when the test well is close to the water injection well, the pressure drop is continuously reduced until the pressure drop is 0.1MPa, and the rising is started again; the test well distance is near to the production well, and has no inflection point and is always growing.
FIG. 6 is a diagram illustrating an example of a near-well production well as the primary disturbance signal, FIG. 7 is a test curve of a continuously-conductive type, and the source of the disturbance signal can be determined to be the production well disturbance, i.e. the disturbance intensity Q D > 0; secondly, the first step of the method comprises the steps of,calculating a pressure drop curve characteristic value= 392.3267kPa/32.52 kPa=12.06 according to any point value (29.1 h,392.3267 kPa) of the test curve and a corresponding point value (29.1 h,32.52 kPa) of the extrapolation curve; finally, the interference strength qd= { -7,5}, is derived from the relation of the curve eigenvalue and the interference strength, since Q has been determined D > 0, thus Q D =5, then the production well yield can be calculated from the interference intensity.
FIG. 8 is a diagram of an example of a near-well injector as the primary disturbance signal, the test curve of FIG. 9 being of the discontinuous conductivity type, the source of the disturbance signal being determined to be injector disturbance, i.e., disturbance intensity Q D < 0; secondly, calculating a pressure drop curve characteristic value= 261.0884kPa/32.52 kPa=8.03 according to any point value (29.1 h,261.0884 kPa) of the test curve and a corresponding point value (29.1 h,32.52 kPa) of the extrapolation curve; finally, the interference strength QD= { -5,3} is obtained according to the relation between the curve characteristic value and the interference strength. Since Q has been determined D < 0, so qd= -5, the injection quantity of the injection well can be calculated from the disturbance intensity.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (7)
1. A plate analysis method for determining interference intensity under a balance of gas production, comprising:
collecting a bottom hole pressure parameter of an unconnected well, and preprocessing the parameter;
calculating a pressure drop value according to the preprocessed bottom hole pressure parameter, and drawing a pressure drop curve plate under a double-logarithmic coordinate;
calculating a pressure drop graph curve characteristic value and calculating injection and production interference intensity;
calculating the characteristic value of the pressure drop graph curve, wherein calculating the injection and production interference intensity comprises the steps that the characteristic value of the curve is the numerical ratio of an actual measurement pressure drop curve to an extrapolated pressure drop curve between straight line segments, and the type of an interference well is determined according to the characteristic value of the curve;
the numerical ratio D between the straight line segments of the measured pressure drop curve and the extrapolated pressure drop curve is expressed as:
wherein Δt is b Selecting any test time point for the second curve segment; Δp w (Δt b ) For the second curve segment delta t b Numerical values at;a second curve segment delta t of the pressure drop curve of the first curve segment b Extrapolated values at;
the type of the interference well is determined according to the curve characteristic value, and the relation between the curve characteristic value and the interference intensity is expressed as follows:
D＝2|Q D +1|
wherein Q is D The interference strength under interference is balanced for the injection.
2. The pattern analysis method for judging interference intensity under the balance of the gas production as claimed in claim 1, wherein: the step of collecting the non-shut-in well bottom pressure parameters comprises the step of putting a pressure gauge into the bottom of an observation well, starting the non-shut-in well interference well test, and monitoring the bottom pressure data by the pressure gauge in real time.
3. The pattern analysis method for judging interference intensity under the balance of the gas production as claimed in claim 2, wherein: the pre-processing of the parameters includes removing initial and final unbalanced bottom hole pressure data.
4. The pattern analysis method for judging interference intensity under the balance of the gas production as claimed in claim 1, wherein: the step of calculating the pressure drop value according to the bottom hole pressure data comprises the step of calculating the pressure drop according to the bottom hole pressure meter time and the pressure data during the test.
5. The pattern analysis method for judging interference intensity under the balance of the gas production as recited in claim 4, wherein:
the pressure drop, expressed as:
ΔT＝T-T 0
Δp w (Δt)＝|p w (T 0 )-p w (T)|
wherein P is w Is the bottom hole pressure; t (T) 0 Production time at the beginning of the well-out test; t is any production time during the well-out test.
6. The pattern analysis method for judging interference intensity under the balance of the gas production as set forth in claim 5, wherein: the drawing of the pressure drop curve plate under the double logarithmic coordinates comprises the steps of drawing a double logarithmic pressure drop curve by taking test time as an abscissa value and pressure drop as an ordinate value.
7. The pattern analysis method for judging interference intensity under the balance of the gas production as claimed in claim 1, wherein: the interference strength under the balanced interference of the injection and recovery is expressed as:
wherein Q is the test well yield and Q is the interference well yield;
when Q is D Judging the interference well as a production well according to the value of more than 0; when Q is D Judging the interference well as an injection well; at the balance of the production, the injection well has an injection quantity equal to the production of the production well, i.e. Σq D ＝0。
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