Integrated testing method for oil well fluid production profile and dipole acoustic wave

Abstract

This invention relates to the field of oil and gas well testing and production technology, and is an integrated testing method for oil well production profiles and dipole acoustic logging, comprising the following steps: Step 1, installing a test string together, the test string including a multi-core cable and, from top to bottom, coiled tubing, an array probe production profile logging tool, a centralizer, a bridle, and a dipole acoustic logging tool connected together. The lower end of the multi-core cable passes through the coiled tubing and is connected to both the array probe production profile logging tool and the dipole acoustic logging tool; Step 2, cleaning the wellbore. This invention achieves integrated monitoring of oil well production profiles and dipole acoustic logging, reducing the number of coiled tubing runs, and solving the problems of long construction cycles and high costs associated with separately conducting oil well production profile monitoring and dipole acoustic detection. It makes the two testing technologies complementary, providing a reference for reservoir and fracturing effect evaluation and fracturing scheme optimization, and improving the accuracy of reservoir sweet spot identification and fracturing effect evaluation.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well testing and production technology, and is an integrated testing method for oil well production profile and dipole acoustic wave. Background Technology

[0002] As domestic oil and gas exploration and development continues to deepen, low-permeability reservoirs account for more than two-thirds of proven reserves. Low-permeability reservoirs generally have complex lithology and strong heterogeneity, lacking natural production capacity after perforation. They often require fracturing technology to stimulate the reservoir, increasing connectivity and drainage area, effectively expanding seepage channels, and improving production capacity. The success of fracturing directly affects the final oil and gas extraction outcome. Furthermore, due to the strong heterogeneity of the reservoirs, the production capacity varies greatly after staged fracturing. Therefore, it is crucial to understand the fracturing and fracture creation under different fracturing processes and parameters, as well as the production capacity effects of each stage and cluster after fracturing. This provides important evidence for verifying sweet spot reservoir classification and optimizing fracturing stimulation schemes.

[0003] A journal article titled "Research on Interpretation Methods of Fluid Imaging Logging Data in Horizontal Wells of Offshore Oilfields" discloses that by using a fluid scanning imaging (FSI) logging tool that integrates multiple micro-rotors and sensors, the flow velocity and phase holding ratio of each layer in the wellbore can be measured, thereby enabling the monitoring of multiphase flow production profiles in horizontal wells.

[0004] Patent application number 201910644976.5, entitled "A Method and Apparatus for Evaluating the Effect of Formation Hydraulic Fracturing," discloses a method that involves array acoustic logging within a depth range to construct dipole acoustic logging data from different orientations. This data is then filtered and normalized to calculate the energy envelope of scattered waves before and after fracturing. The difference in shear wave velocity and scattered wave energy between the two locations is used to jointly evaluate the fracturing effect around the wellbore. The advantage of this method is that it can evaluate the fracturing effect along the wellbore direction and also within a radial range of tens of meters around the wellbore.

[0005] An article titled "Research on Evaluation Method of Fracturing Effect in Low-Permeability Reservoirs Based on Dipole Acoustic Logging Data" discloses that by comparing the anisotropy of the formation before and after fracturing, the longitudinal extension height and the complexity of fracture development can be accurately identified.

[0006] Dipole acoustic logging and production profile monitoring are two testing methods that can evaluate reservoir and fracturing effects from different perspectives. Each technology has its advantages, with array multi-probe logging showing a significant advantage over distributed fiber optic monitoring for oil well production profile testing. Considering testing costs, some oil wells use array multi-probe logging while others use dipole acoustic logging. Simultaneous monitoring with both technologies requires multiple runs, resulting in long testing cycles and high costs. Currently, the advantages of these two evaluation technologies are not effectively complementary. There is an urgent need for an integrated method for testing oil well production profiles and dipole acoustic logging to reduce the overall testing cycle and cost of downhole production profile and dipole acoustic monitoring, comprehensively evaluate reservoir and fracturing effects from different perspectives, and achieve accurate evaluation of reservoir and fracturing effects. Summary of the Invention

[0007] This invention provides an integrated testing method for oil well production profile and dipole acoustic wave detection, which overcomes the shortcomings of the prior art and effectively solves the problems of long construction cycle and high cost associated with separate oil well production profile monitoring and dipole acoustic wave detection.

[0008] The technical solution of this invention is achieved through the following measures: an integrated testing method for oil well fluid production profile and dipole acoustic wave, comprising the following steps:

[0009] Step 1: Install the test string together. The test string includes a multi-core cable and, from top to bottom, a continuous tubing, an array probe production profile logging tool, a centralizer, a bridle, and a dipole acoustic logging tool. The lower end of the multi-core cable passes through the continuous tubing and is connected to the array probe production profile logging tool and the dipole acoustic logging tool, respectively.

[0010] Step 2: Clean the wellbore thoroughly. After lowering the test string to a certain depth, test whether the dipole sonic logging tool is functioning properly. If it is functioning properly, continue lowering the test string; if it is not functioning properly, remove the test string and inspect it.

[0011] Step 3: Lower the lower end of the test string to the bottom of the artificial well, and lift the test string at a constant speed. After the dipole sonic logging tool monitors the formation anisotropy for the first time, the test string is pulled out.

[0012] Step four: Perform staged fracturing on the oil well, followed by fluid drainage and trial production.

[0013] Step 5, repeat step 2;

[0014] Step 6: Lower the test string to the bottom of the artificial well again, perform dipole sonic logging with the well shut in, and raise the test string at a constant speed. The dipole sonic logging tool will monitor the formation anisotropy for the second time. After the monitoring of the perforated and fracturing section is completed, lower the test string to the bottom of the artificial well again.

[0015] Step 7: Well production. After the production rate and oil-water ratio stabilize, the test string is raised at a constant speed. The array probe production profile logging tool monitors and judges in real time whether the array probe production profile logging tool is working properly. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. The raising speed is determined based on the previous operation of the array probe production profile logging tool. The test string is raised at a constant speed, and the operation of the array probe production profile logging tool is monitored in real time. After the qualified production profile data is recorded, the test string is pulled out.

[0016] Step 8: Based on the formation anisotropy monitored by the dipole sonic logging tool for the first time and the formation anisotropy monitored by the dipole sonic logging tool for the second time, evaluate each perforation cluster, use the evaluation results as auxiliary data, and obtain the production profile interpretation results.

[0017] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0018] In step one above, the multi-core cable is a 7-core cable, with 3 cable cores connected to the array probe production profile logging tool and 2 cable cores connected to the dipole acoustic logging tool; the array probe production profile logging tool is equipped with a turbine speed probe, a density probe and a water holding probe.

[0019] Step seven above involves starting production and, once the production rate and oil-water ratio have stabilized, uniformly raising the test string. The operation of the turbine speed probe, density probe, and water-holding probe of the array probe production profile logging tool is monitored in real time, and production profile data is collected. This production profile data includes turbine speed, fluid density, and water holdup. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. Based on the previous operation of the turbine speed probe, density probe, and water-holding probe, the current raising speed is determined. The test string is raised uniformly, and the operation of the turbine speed probe, density probe, and water-holding probe of the array probe production profile logging tool is monitored again in real time, and production profile data is collected. After recording qualified production profile data, the test string is pulled out.

[0020] In step eight above, based on the formation anisotropy monitored for the first time by the dipole sonic logging tool and the formation anisotropy monitored for the second time by the dipole sonic logging tool, the fracturing initiation, fracture height, and degree of fracture network development of each perforation cluster are evaluated.

[0021] In step two above, the test string is lowered 500 meters into the well to test whether the dipole acoustic logging tool is functioning properly.

[0022] The speed at which the test tube is lifted in step six is ​​the same as the speed at which the test tube is lifted at a constant speed in step three.

[0023] This invention achieves integrated monitoring of oil well production profile and dipole acoustic wave detection, reducing the number of coiled tubing runs and solving the problems of long construction cycles and high costs associated with separately monitoring oil well production profile and conducting dipole acoustic wave detection. It enables the two testing technologies to complement each other, providing a reference for reservoir and fracturing effect evaluation and fracturing scheme optimization, and improving the accuracy of reservoir sweet spot recognition and fracturing effect evaluation. Attached Figure Description

[0024] Appendix Figure 1 This is a schematic diagram of the front sectional view of Embodiment 1.

[0025] The codes in the attached diagram are as follows: 1 for coiled tubing, 2 for array probe production profile logging tool, 3 for centralizer, 4 for bridle, 5 for dipole acoustic logging tool, and 6 for multi-core cable. Detailed Implementation

[0026] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0027] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0028] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0029] Example 1: As shown in the attached document Figure 1 As shown, the integrated testing method for oil well production profile and dipole acoustic wave detection includes the following steps:

[0030] Step 1: Install the test string together. The test string includes a multi-core cable 6 and a continuous tubing 1, an array probe production profile logging tool 2, a centralizer 3, a bridle 4, and a dipole acoustic logging tool 5 connected together from top to bottom. The lower end of the multi-core cable 6 passes through the continuous tubing and is connected to the array probe production profile logging tool 2 and the dipole acoustic logging tool 5 respectively.

[0031] Step 2: Clean the wellbore thoroughly. After lowering the test string to a certain depth, test whether the dipole sonic logging tool 5 is functioning properly. If it is functioning properly, continue lowering the test string; if it is not functioning properly, remove the test string and inspect it.

[0032] Step 3: Lower the lower end of the test string to the bottom of the artificial well, and lift the test string at a constant speed. After the dipole sonic logging tool 5 monitors the formation anisotropy for the first time, remove the test string.

[0033] Step four: Perform staged fracturing on the oil well, followed by fluid drainage and trial production.

[0034] Step 5, repeat step 2;

[0035] Step 6: Lower the test string to the bottom of the artificial well again, perform dipole sonic logging with the well shut in, and lift the test string at a constant speed. The dipole sonic logging tool 5 monitors the formation anisotropy for the second time. After the monitoring of the perforated and fracturing section is completed, lower the test string to the bottom of the artificial well again.

[0036] Step 7: Well production. After the production rate and oil-water ratio stabilize, the test string is raised at a constant speed. The array probe production profile logging tool 2 monitors and judges in real time whether the array probe production profile logging tool 2 is working properly. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. The raising speed is determined based on the previous operation of the array probe production profile logging tool 2. The test string is raised at a constant speed, and the operation of the array probe production profile logging tool 2 is monitored in real time. After the qualified production profile data is recorded, the test string is pulled out.

[0037] Step 8: Based on the formation anisotropy monitored for the first time by the dipole sonic logging tool 5 and the formation anisotropy monitored for the second time by the dipole sonic logging tool 5, evaluate each perforation cluster, use the evaluation results as auxiliary data, and obtain the production profile interpretation results.

[0038] This invention achieves integrated monitoring of oil well production profile and dipole acoustic wave, reducing the number of coiled tubing runs and solving the problems of long construction cycles and high costs associated with separately monitoring oil well production profile and conducting dipole acoustic wave detection. It enables the two testing technologies to complement each other, providing a reference for reservoir and fracturing effect evaluation and fracturing scheme optimization, and improving the accuracy of reservoir sweet spot recognition and fracturing effect evaluation.

[0039] The above-mentioned integrated testing method for oil well production profiles and dipole acoustic waves can be further optimized and / or improved according to actual needs:

[0040] Example 2: As an optimization of the above example, in step one, the multi-core cable 6 is a 7-core cable. Three cores of the multi-core cable 6 are connected to the array probe production profile logging tool 2, and two cores are connected to the dipole acoustic logging tool 5. The array probe production profile logging tool 2 is equipped with a turbine speed probe, a density probe, and a water-holding probe. The remaining two cores of the multi-core cable 6 are reserved. This allows for the measurement of multiple parameters of the horizontal well.

[0041] Example 3: As an optimization of the above example, step seven involves: after well production and stabilization of production and oil-water ratio, the test string is raised at a constant speed. The turbine speed probe, density probe, and water holdup probe of the array probe production profile logging tool 2 are used to determine in real time whether they are functioning correctly and to collect production profile data. The production profile data includes turbine speed, fluid density, and water holdup. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. Based on the previous operation of the turbine speed probe, density probe, and water holdup probe, the current raising speed is determined. The test string is raised at a constant speed, and the turbine speed probe, density probe, and water holdup probe of the array probe production profile logging tool 2 are used again to determine in real time whether they are functioning correctly and to collect production profile data. After recording qualified production profile data, the test string is pulled out. This allows the turbine speed, fluid density, and water holdup to be displayed in real time on the surface equipment, facilitating real-time data analysis and the characteristics of the horizontal well fracturing section.

[0042] Example 4: As an optimization of the above example, in step eight, based on the first and second monitoring of formation anisotropy by the dipole sonic logging tool 5, the fracturing initiation, fracture height, and fracturing network development of each perforation cluster are evaluated. This can reflect the reservoir properties and fracturing characteristics of the horizontal well.

[0043] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, in step two, after the test string is lowered 500 meters into the well, the dipole acoustic logging tool 5 is tested to check if it is functioning properly. This allows for timely detection of any faults in the dipole acoustic logging tool 5, preventing malfunctions from occurring during the testing process.

[0044] Example 6: As an optimization of the above example, the speed at which the test string is pulled up in step 6 is the same as the speed at which the test string is pulled up at a constant speed in step 3. This ensures that the data collected by the dipole sonic logging tool 5 during the second monitoring of formation anisotropy is consistent with the data collected during the first monitoring of formation anisotropy, facilitating subsequent data comparison and improving testing efficiency.

[0045] The specific process of the integrated testing method for oil well fluid production profile and dipole acoustic wave in this invention:

[0046] The first step is to assemble a 2-inch, 6500-meter-long continuous tubing 1 with a multi-core cable 6 running through it. The lower part of the continuous tubing 1 is connected in sequence to the array probe production profile logging tool 2, the centralizer 3, the bridle 4, and the dipole acoustic logging tool 5. The multi-core cable 6 is connected to the dipole acoustic logging tool 5, and then the power is turned on for testing to ensure that the dipole acoustic logging tool 5 is working properly.

[0047] The second step is to clean the wellbore of horizontal well H6023 with a vertical depth of 4200 meters and a horizontal section length of 1500 meters before fracturing. The test string is then lowered into the well. After the test string is lowered 500 meters into the well, the dipole sonic logging tool 5 is tested to be working properly. The test string is then lowered into the well.

[0048] The third step involves lowering the test string to a depth of 5700 meters at the bottom of the artificial well and raising it at a constant speed of 6 meters per minute. The dipole sonic logging tool 5 then performs the first formation anisotropy monitoring. After the horizontal section monitoring is completed, the test string is pulled out.

[0049] The fourth step was to perform 30 stages of hydraulic fracturing on the horizontal well H6023, followed by fluid drainage and trial production.

[0050] Step 5: Drill out the fracturing bridge plug in the wellbore, clean the sand and debris in the horizontal well H6023, and shut in the well. Connect the No. 1, 2, and 3 cable cores of the multi-core cable 6 to the array probe production profile logging tool 2. Connect the No. 4 and 5 cable cores of the multi-core cable 6 to the dipole acoustic logging tool 5. The remaining No. 6 and 7 cable cores of the multi-core cable 6 are reserved. When the test string is 500 meters into the well, if the array probe production profile logging tool 2 and the dipole acoustic logging tool 5 are normal, continue to run the string.

[0051] Step 6: Lower the test string to the bottom of the artificial well again to 5700 meters. With the well shut in, perform dipole sonic logging. Raise the test string at a constant speed of 6 meters per minute. The dipole sonic logging tool 5 monitors the formation anisotropy for the second time. After the monitoring of the perforated and fracturing section is completed, lower the test string to the bottom of the artificial well again to 5700 meters.

[0052] Step 7: Well production. After the production rate and oil-water balance stabilize, the test string is raised at a constant speed of 10 meters per minute to conduct production profile testing. When the test string is raised to the 15th stage of fracturing, real-time data from the surface equipment shows that the turbine speed is abnormally low, while the density probe and water-holding probe are working normally. When the test string is raised to the 17th stage of fracturing, the turbine speed is normal. There may have been foreign objects stuck in the turbine in the early stage. After the horizontal section measurement is completed, the test string is lowered to the horizontal well toe and raised at a constant speed of 15 meters per minute. The turbine speed probe, density probe, and water-holding probe of the array probe production profile logging tool 2 are working normally. After the qualified production profile data is recorded, the surface equipment and multi-core cable 6 are disconnected and the test string is pulled out.

[0053] Step 8: Analyze the anisotropy of the formation before and after fracturing based on dipole acoustic logging data;

[0054] The fracturing levels were 7, 12, 14, and 24. The formation anisotropy was basically the same before and after fracturing (the formation anisotropy was basically the same in the first and second monitoring), and the fractures were not opened.

[0055] Levels 1, 3, 10, 20, 27, and 28 show significant differences in formation anisotropy before and after fracturing (significant differences in formation anisotropy between the first and second monitoring), and well-developed fracturing network.

[0056] According to the production profile monitoring data, levels 1, 3, 10, 20, 27 and 28 are the main production contribution sections, which correspond to the sections with developed fracturing networks and also correspond to the sweet spots of logging and well logging evaluation. This reflects the characteristics that the better the reservoir properties, the more developed the fracturing fractures, and the better the production capacity.

[0057] The contribution rate of the 12th stage of the production profile interpretation is moderate, but the dipole sonic interpretation shows that the fractures are not well developed. The logging and well logging evaluations show that the physical properties and oil content of this section are poor. Based on the dipole sonic test and logging data, it is believed that there may be errors in the interpretation of the 12th stage of the production profile, and a second analysis and interpretation should be carried out.

[0058] Based on the well test, it is believed that the logging and well logging data accurately classified the reservoir sweet spots. In the next step of drilling, when geological steering, drilling should be carried out in accordance with the evaluation criteria of the sweet spots.

[0059] When designing a fracturing scheme, the fracturing pattern should be designed with the concept of creating complex fractures in mind. At the same time, the spacing between fracturing sections should be optimized, and the density of the fracturing network in the horizontal section should be increased.

[0060] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A method for integrated testing of production profile and dipole acoustic wave in oil-producing wells, characterized in that... The steps include the following: Step 1: Install the test string together. The test string includes a multi-core cable and, from top to bottom, a continuous tubing, an array probe production profile logging tool, a centralizer, a bridle, and a dipole acoustic logging tool. The lower end of the multi-core cable passes through the continuous tubing and is connected to the array probe production profile logging tool and the dipole acoustic logging tool, respectively. Step 2: Clean the wellbore thoroughly. After lowering the test string to a certain depth, test whether the dipole sonic logging tool is functioning properly. If it is functioning properly, continue lowering the test string; if it is not functioning properly, remove the test string and inspect it. Step 3: Lower the lower end of the test string to the bottom of the artificial well, and lift the test string at a constant speed. After the dipole sonic logging tool monitors the formation anisotropy for the first time, the test string is pulled out. Step four: Perform staged fracturing on the oil well, followed by fluid drainage and trial production. Step 5, repeat step 2; Step 6: Lower the test string to the bottom of the artificial well again, perform dipole sonic logging with the well shut in, and raise the test string at a constant speed. The dipole sonic logging tool will monitor the formation anisotropy for the second time. After the monitoring of the perforated and fracturing section is completed, lower the test string to the bottom of the artificial well again. Step 7: Well production. After the production rate and oil-water ratio stabilize, the test string is raised at a constant speed. The array probe production profile logging tool monitors and judges in real time whether the array probe production profile logging tool is working properly. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. The raising speed is determined based on the previous operation of the array probe production profile logging tool. The test string is raised at a constant speed, and the operation of the array probe production profile logging tool is monitored in real time. After the qualified production profile data is recorded, the test string is pulled out. Step 8: Based on the formation anisotropy monitored by the dipole sonic logging tool for the first time and the formation anisotropy monitored by the dipole sonic logging tool for the second time, analyze the formation anisotropy before and after fracturing, evaluate the fracturing initiation, fracture height and fracturing network development of each perforation cluster, and use the evaluation results as auxiliary data to obtain the production profile interpretation results. Based on the production profile monitoring data, evaluate the production profile of each fracturing stage, obtain the main production contribution section, and determine whether it corresponds to the development section of the fracturing network.

2. The integrated testing method for oil well production profile and dipole acoustic wave as described in claim 1, characterized in that... In step one, the multi-core cable is a 7-core cable. Three of the cable cores are connected to the array probe production profile logging tool, and two of the cable cores are connected to the dipole acoustic logging tool. The array probe production profile logging tool is equipped with a turbine speed probe, a density probe, and a water-holding probe.

3. The integrated testing method for oil well production profile and dipole acoustic wave according to claim 2, characterized in that... Step seven involves starting production. Once the production rate and oil-water ratio stabilize, the test string is raised at a constant speed. The operation of the turbine speed probe, density probe, and water-holding probe of the array probe production profile logging tool is monitored in real time, and production profile data is collected. The production profile data includes turbine speed, fluid density, and water holdup. After the perforation and fracturing section measurement is completed, the test string is lowered to the bottom of the artificial well. The raising speed is determined based on the previous operation of the turbine speed probe, density probe, and water-holding probe. The test string is raised at a constant speed, and the operation of the turbine speed probe, density probe, and water-holding probe of the array probe production profile logging tool is monitored in real time again, and production profile data is collected. After the qualified production profile data is recorded, the test string is pulled out.

4. The integrated testing method for oil well production profile and dipole acoustic wave according to claim 1, 2, or 3, characterized in that... In step two, after the test string is lowered 500 meters into the well, the dipole acoustic logging tool is tested to see if it is functioning properly.

5. The integrated testing method for oil well production profile and dipole acoustic wave according to claim 1, 2, or 3, characterized in that... The speed at which the test tube is lifted in step six is ​​the same as the speed at which the test tube is lifted at a constant speed in step three.

6. The integrated testing method for oil well production profile and dipole acoustic wave according to claim 4, characterized in that... The speed at which the test tube is lifted in step six is ​​the same as the speed at which the test tube is lifted at a constant speed in step three.

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