A system and method for identifying interference wells based on interference well testing without shutting in the well

Abstract

The present invention discloses a system and method for identifying an interference well based on an unshut-in interference well test in the technical field of oil and gas field development, including: obtaining the bottom hole pressure drop during the unshut-in test time and the unshut-in test; calculating the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test; drawing a double logarithmic chart based on the unshut-in test time, the bottom hole pressure drop during the unshut-in test, and the absolute value of the pressure drop derivative; reading the characteristic value on the pressure drop derivative curve in the double logarithmic chart to calculate the pressure drop derivative characteristic value; calculating the relative production of the interference well based on the pressure drop derivative characteristic value; determining the type of the interference well according to the relative production of the interference well. The present invention proposes a new unshut-in interference well test double logarithmic chart, which not only has the functions of the existing unshut-in interference well test double logarithmic chart, but also can quickly identify the production / water injection type and production of adjacent wells through the pressure drop derivative curve.

Description

Technical Field

[0001] The invention relates to an interference well identification system and method based on interference well testing without shutting in the well, belonging to the technical field of oil and gas field development. Background Art

[0002] Interference well testing is a production test commonly used in oilfields to determine the connectivity between wells. Generally, a shut-in test well is used as an observation well, and an adjacent well is used as an exciting well with a certain production rate. The pressure recovery data recorded at the bottom of the observation well can be used to determine whether the well pairs are dynamically connected and to determine the interference of adjacent wells. Most mines use shut-in interference well testing of observation wells. As mine production pays more and more attention to the needs of oil well production, a non-shut-in interference well testing method has gradually been favored by mine engineers. Although the subsequent interpretation of the non-shut-in interference well testing is the same as the shut-in interference well testing when the adjacent well is a production interference, there is a dilemma in the subsequent interpretation of this non-shut-in interference well testing: it is impossible to identify the interference diagnosis of adjacent water injection wells on the double logarithmic pressure and pressure drop derivative chart. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a system and method for identifying interference wells based on non-shut-in interference well testing, and propose a new double logarithmic chart for non-shut-in interference well testing, which not only has the functions of the existing double logarithmic chart for non-shut-in interference well testing, but also can quickly identify the production / water injection type and output of adjacent wells through the pressure drop derivative curve.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] In a first aspect, the present invention provides a method for identifying an interference well based on an interference well test without shutting in the well, comprising:

[0006] Obtain the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0007] Calculating the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0008] A double logarithmic chart is drawn based on the unshut-in test time, the bottom hole pressure drop during the unshut-in test, and the absolute value of the pressure drop derivative;

[0009] Read the characteristic value on the pressure drop derivative curve in the double logarithmic chart, and calculate the pressure drop derivative characteristic value;

[0010] Calculate the relative production of the interference well based on the pressure drop derivative characteristic value;

[0011] Determine the type of interference well based on the relative production of the interference well.

[0012] Furthermore, the non-shut-in test time is:

[0013] Δt=tT

[0014] Where: Δt is the open well test time, T is the production time when the open well test starts, and t is any production time during the open well test.

[0015] Furthermore, the bottom hole pressure drop during the non-shut-in test is:

[0016] Δp w (t) = p w (T)-p w (t)

[0017] Where: Δp w (t) is the bottom hole pressure drop during the unshut-in test, p w (T) is the bottom hole pressure at the start of the production time of the unshut-in test, p w (t) is the bottom hole pressure at any production time during the unshut-in test.

[0018] Furthermore, the absolute value calculation formula of the pressure drop derivative is:

[0019]

[0020] Where: Δp' w is the pressure drop derivative, Δp w is the bottom hole pressure drop during the open well test, and Δt is the open well test time.

[0021] Furthermore, the calculation formula of the pressure drop derivative characteristic value is:

[0022] L D =L / L0

[0023] Where: L D is the pressure drop derivative characteristic value, L and L0 are two characteristic values ​​on the pressure drop derivative curve.

[0024] Furthermore, the calculation formula of the relative production of the interference well is:

[0025] q D = ±L D -1

[0026] Where: q D is the relative production of the interference well, and q D =q 干扰井 / q 测试井 ,q 干扰井 is the production of the interference well, q 测试井 The production of the test well.

[0027] Furthermore, the type of the interference well is determined according to the relative production of the interference well, including: when the relative production of the interference well is a positive value, the interference well is a production well; when the relative production of the interference well is a negative value, the interference well is a water injection well.

[0028] In a second aspect, the present invention provides an interference well identification system based on interference well testing without shutting in the well, comprising:

[0029] Data acquisition module: used to obtain the test time without shutting in the well and the bottom hole pressure drop during the test without shutting in the well;

[0030] Pressure drop derivative absolute value calculation module: used to calculate the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0031] Double logarithmic chart drawing module: used to draw a double logarithmic chart based on the open well test time, the bottom hole pressure drop during the open well test and the absolute value of the pressure drop derivative;

[0032] Pressure drop derivative characteristic value calculation module: used to read the characteristic value on the pressure drop derivative curve in the double logarithmic chart and calculate the pressure drop derivative characteristic value;

[0033] Interference well relative production calculation module: used to calculate the relative production of interference wells based on the pressure drop derivative characteristic value;

[0034] Interference well type determination module: used to determine the interference well type based on the relative production of the interference well.

[0035] In a third aspect, the present invention provides an interference well identification device based on interference well testing without shutting in the well, including a processor and a storage medium;

[0036] The storage medium is used to store instructions;

[0037] The processor is used to operate according to the instructions to execute the steps of any of the methods described above.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention proposes a method for determining the interference type and interference amount of adjacent wells by using only the pressure test data chart, which overcomes the problem that the current non-shut-in interference well test chart cannot identify the water injection interference well. The interference type can be qualitatively identified only according to the chart curve morphology, which is simple to operate and has high applicability in the mine. The working system and output of the interfering adjacent wells can be quickly determined by the characteristic value of the derivative curve in the pressure drop curve of the non-shut-in interference well test, which does not require cumbersome calculation and fitting processes, reduces the workload of data interpretation, is simple to operate and has wide applicability, and can improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 : is a flow chart of a method for calculating the interference amount of adjacent wells by interference well testing without shutting in the well, provided in the first embodiment of the present invention;

[0042] Figure 2 is the pressure drop derivative characteristic value L provided in the first embodiment of the present invention D Relative production of interference wells q D Diagnostic plates of relationships;

[0043] Figure 3 It is the double logarithmic chart of pressure drop and pressure drop derivative currently used (production well interference condition: 3q);

[0044] Figure 4 It is the double logarithmic chart of pressure drop and pressure drop derivative currently used (injection well interference condition: -5q);

[0045] Figure 5 It is a double logarithmic chart of pressure drop and pressure drop derivative provided in Example 1 of the present invention (interference condition of water injection well: -5q). DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0047] Embodiment 1:

[0048] See also Figure 1 , a method for identifying interference wells based on interference well testing without shutting in the well, comprising:

[0049] S1. Lower the pressure gauge and conduct pressure test without shutting down the well to interfere with the well test.

[0050] A pressure gauge is lowered to the bottom of the observation well to start the well test without shutting down the well. The pressure gauge monitors the bottom hole pressure data in real time.

[0051] S2. Calculate the pressure drop and the corresponding pressure drop derivative.

[0052] According to the bottom hole pressure gauge time and pressure data during the test, the pressure drop and pressure drop derivative are obtained according to the calculation method provided by the present invention. Given the bottom hole pressure gauge time and pressure data during the test, the test time during the non-shut-in test is calculated by formula (1):

[0053] Δt=tT (1)

[0054] Where: Δt is the open well test time, T is the production time when the open well test starts, and t is any production time during the open well test.

[0055] The bottom hole pressure drop during the unshut-in test is calculated by formula (2):

[0056] Δp w (t) = p w (T)-p w (t) (2)

[0057] Where: Δp w (t) is the bottom hole pressure drop during the unshut-in test, p w (T) is the bottom hole pressure at the start of the production time of the unshut-in test, p w (t) is the bottom hole pressure at any production time during the unshut-in test.

[0058] The pressure drop derivative calculated by the existing method is shown in formula (3):

[0059]

[0060] In this embodiment, the pressure drop derivative is calculated by formula (4):

[0061]

[0062] Where: Δp' w is the pressure drop derivative, Δp w is the bottom hole pressure drop during the open well test.

[0063] S3. Draw a double logarithmic graph to obtain the characteristic value of the pressure drop derivative.

[0064] The test time is obtained from formula (1), the pressure drop is obtained from formula (2), and the pressure drop derivative is obtained from formula (4). A double logarithmic curve is drawn with the test time as the horizontal axis value and the pressure drop and the pressure drop derivative as the vertical axis values. From the pressure drop derivative curve, the characteristic values ​​L and L0 are read. The pressure drop derivative characteristic value L D =L / L0.

[0065] S4. Calculate the interference amount and determine the type of interference well.

[0066] According to the read pressure drop derivative characteristic value, the numerical value of the interference amount of the adjacent well is obtained by the calculation method of the present invention, and the type of the interference well is determined according to the diagnostic chart provided by the present invention. In this embodiment, the numerical value of the interference amount of the adjacent well is calculated by formula (5):

[0067] q D = ±L D -1 (5)

[0068] Where: q D is the relative production of the interference well, and q D =q 干扰井 / q 测试井 ,q 干扰井 is the production of the interference well, q 测试井 The production of the test well.

[0069] according to Figure 2 The diagnostic panel shown identifies the type of interfering well, for example:

[0070] ① The double logarithmic curve currently used is as follows Figure 3 As shown, the characteristic values ​​L = 2, L0 = 0.5 are obtained; according to formula (5), q is calculated D ={3,-5}; and according to the “pressure drop curve is upturned and the pressure drop derivative can be derived everywhere”, q is judged D is a positive value. Therefore, q D =3, that is, the interference well is a production well, and its production is 3 times that of the test well.

[0071] ② The double logarithmic curve currently used is as follows Figure 4 As shown in the figure, the interference amount of the interference well cannot be obtained because the characteristic value L cannot be obtained. However, it can be obtained based on the pressure drop and pressure drop derivative curve that the interference well is a water injection well.

[0072] ③ The double logarithmic curve in this embodiment is as follows Figure 5 As shown, the characteristic values ​​L = 2, L0 = 0.5 are obtained; according to formula (5), q is calculated D ={3,-5}; and according to the “pressure drop curve hanging down and the pressure drop derivative has a non-differentiable point”, q is judged D is a negative value. Therefore, q D =-5, that is, the interference well is an injection well, and the injection volume is 5 times that of the test well.

[0073] This solution can be applied to well group tests with single well or multiple well interference. Regardless of whether the observation well is a production well or a water injection well, the adjacent wells that cause interference can be: interference from a single production adjacent well, interference from multiple production adjacent wells at the same time, interference from a single water injection well, interference from multiple water injection wells at the same time, and interference from both production adjacent wells and water injection adjacent wells at the same time.

[0074] Embodiment 2:

[0075] A system for identifying an interference well based on an interference well test without shutting in the well, which can implement a method for identifying an interference well based on an interference well test without shutting in the well described in the first embodiment, comprises:

[0076] Data acquisition module: used to obtain the test time without shutting in the well and the bottom hole pressure drop during the test without shutting in the well;

[0077] Pressure drop derivative absolute value calculation module: used to calculate the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0078] Double logarithmic chart drawing module: used to draw a double logarithmic chart based on the open well test time, the bottom hole pressure drop during the open well test and the absolute value of the pressure drop derivative;

[0079] Pressure drop derivative characteristic value calculation module: used to read the characteristic value on the pressure drop derivative curve in the double logarithmic chart and calculate the pressure drop derivative characteristic value;

[0080] Interference well relative production calculation module: used to calculate the relative production of interference wells based on the pressure drop derivative characteristic value;

[0081] Interference well type determination module: used to determine the interference well type based on the relative production of the interference well.

[0082] Embodiment three:

[0083] The embodiment of the present invention further provides a device for identifying an interference well based on interference well testing without shutting in the well, which can implement the method for identifying an interference well based on interference well testing without shutting in the well described in the first embodiment, including a processor and a storage medium;

[0084] The storage medium is used to store instructions;

[0085] The processor is used to operate according to the instructions to perform the steps of the following method:

[0086] Obtain the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0087] Calculating the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0088] A double logarithmic chart is drawn based on the unshut-in test time, the bottom hole pressure drop during the unshut-in test, and the absolute value of the pressure drop derivative;

[0089] Read the characteristic value on the pressure drop derivative curve in the double logarithmic chart, and calculate the pressure drop derivative characteristic value;

[0090] Calculate the relative production of the interference well based on the pressure drop derivative characteristic value;

[0091] Determine the type of interference well based on the relative production of the interference well.

[0092] Embodiment 4:

[0093] The embodiment of the present invention further provides a computer-readable storage medium, which can implement the interference well identification method based on the interference well test without shutting in the well as described in the first embodiment, and stores a computer program thereon, which implements the steps of the following method when the program is executed by a processor:

[0094] Obtain the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0095] Calculating the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test;

[0096] A double logarithmic chart is drawn based on the unshut-in test time, the bottom hole pressure drop during the unshut-in test, and the absolute value of the pressure drop derivative;

[0097] Read the characteristic value on the pressure drop derivative curve in the double logarithmic chart, and calculate the pressure drop derivative characteristic value;

[0098] Calculate the relative production of the interference well based on the pressure drop derivative characteristic value;

[0099] Determine the type of interference well based on the relative production of the interference well.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0101] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for identifying interference wells based on interference well testing without shutting in the well, Its characteristics are: include: Obtain the open well test time and the bottom hole pressure drop during the open well test; Calculating the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test; A double logarithmic chart is drawn based on the unshut-in test time, the bottom hole pressure drop during the unshut-in test, and the absolute value of the pressure drop derivative; Read the characteristic value on the pressure drop derivative curve in the double logarithmic chart, and calculate the pressure drop derivative characteristic value; Calculate the relative production of the interference well based on the pressure drop derivative characteristic value; Determine the type of interference well based on its relative production.

2. The interference well identification method based on the interference well test without shutting in the well according to claim 1, Its characteristics are: The non-shut-in test time is: Δt=tT Where: Δt is the open well test time, T is the production time when the open well test starts, and t is any production time during the open well test.

3. The interference well identification method based on interference well testing without shutting in the well according to claim 1, Its characteristics are: The bottom hole pressure drop during the unshut-in test is: Δp w (t)=p w (T)-p w (t) Where: Δp w (t) is the bottom hole pressure drop during the unshut-in test, p w (T) is the bottom hole pressure at the start of the production time of the unshut-in test, p w (t) is the bottom hole pressure at any production time during the unshut-in test.

4. The interference well identification method based on interference well testing without shutting in the well according to claim 1, Its characteristics are: The absolute value calculation formula of the pressure drop derivative is: Where: Δp' w is the pressure drop derivative, Δp w is the bottom hole pressure drop during the open well test, and Δt is the open well test time.

5. The interference well identification method based on interference well testing without shutting in the well according to claim 1, Its characteristics are: The calculation formula of the pressure drop derivative characteristic value is: L D =L / L0 Where: L D is the pressure drop derivative characteristic value, L and L0 are two characteristic values ​​on the pressure drop derivative curve.

6. The interference well identification method based on interference well testing without shutting in the well according to claim 5, Its characteristics are: The calculation formula of the relative production of the interference well is: q D =±L D -1 Where: q D is the relative production of the interference well.

7. The interference well identification method based on interference well testing without shutting in the well according to claim 1, Its characteristics are: The type of the interference well is determined according to the relative production of the interference well, including: when the relative production of the interference well is a positive value, the interference well is a production well; when the relative production of the interference well is a negative value, the interference well is a water injection well.

8. A disturbance well identification system based on non-shut-in disturbance well testing, Its characteristics are: include: Data acquisition module: used to obtain the test time without shutting in the well and the bottom hole pressure drop during the test without shutting in the well; Pressure drop derivative absolute value calculation module: used to calculate the absolute value of the pressure drop derivative based on the unshut-in test time and the bottom hole pressure drop during the unshut-in test; Double logarithmic chart drawing module: used to draw a double logarithmic chart based on the open well test time, the bottom hole pressure drop during the open well test and the absolute value of the pressure drop derivative; Pressure drop derivative characteristic value calculation module: used to read the characteristic value on the pressure drop derivative curve in the double logarithmic chart and calculate the pressure drop derivative characteristic value; Interference well relative production calculation module: used to calculate the relative production of interference wells based on the pressure drop derivative characteristic value; Interference well type determination module: used to determine the interference well type based on the relative production of the interference well.

9. A device for identifying interference wells based on interference well testing without shutting down the well, Its characteristics are: including processor and storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, Its characteristics are: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images