Packer clamping and sealing liquid production profile testing tubular column and method

Abstract

The invention relates to the technical field of oil and gas well oil testing and production testing, in particular to a packer clamping and sealing production fluid profile testing tubular column and method.The packer clamping and sealing production fluid profile testing tubular column comprises a first continuous oil pipe, a production and profile logging instrument, a second continuous oil pipe and a packer which are sequentially connected together from top to bottom, and a depth counter is installed at the upper end of the first continuous oil pipe. The device is reasonable and compact in structure, the production and profile logging instrument, the second continuous oil pipe and the packer can be accurately positioned by arranging the depth counter, the test efficiency of the perforation clusters is improved, each perforation cluster can be tested by arranging the production and profile logging instrument and the packer, and the test efficiency of the perforation clusters is improved. The problems that due to the fact that dragging of the coiled tubing is not uniform, the number of revolutions of a turbine is abnormal, due to the fact that dragging of the coiled tubing breaks the distribution state of oil, gas and water in a casing pipe, the deviation of a testing result is large, and testing of out-of-pipe channeling outside the casing pipe is inaccurate are solved, the fluid production contribution rate of each perforation cluster can be accurately tested, and a basis is provided for reservoir recognition and fracturing scheme optimization.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well oil testing and production testing, and relates to a packer-sealed production fluid profile testing pipe column and method. Background Art

[0002] In recent years, among the newly discovered oil and gas reserves in my country, more than 70% of the oil reserves and more than 90% of the natural gas reserves are low-porosity and low-permeability oil and gas reservoirs, and the proportion is still increasing year by year. Low-permeability oil and gas resources have become the main exploration and development targets in my country. For low-porosity and low-permeability reservoirs, large-scale volume transformation is generally required to obtain commercial oil and gas flows. Large-scale segmented volume fracturing transformation has become the main technology for increasing production. However, due to the strong heterogeneity of the reservoir, the production capacity after fracturing transformation varies greatly. It is urgent to understand the production capacity of each segment and cluster, which provides an important basis for fine classification of reservoirs, optimization of fracturing transformation plans, and repeated fracturing layer selection.

[0003] The production fluid profile testing technology mainly includes crawler + production profile testing instrument, continuous tubing + production profile testing instrument and fiber-optic continuous tubing testing technology. For the production fluid profile testing of long horizontal sections and oil and water wells, the continuous tubing + production profile tester testing technology has obvious advantages. Currently, there are continuous tubing + production profile tester uniform speed dragging monitoring technology and continuous tubing + double production profile tester non-drag fine monitoring technology. However, for well formations with poor cementing quality and no stress shielding, the fluid may flow outside the casing during the drainage process after large-scale fracturing transformation, resulting in inaccurate test results of the continuous tubing + production profile tester. There is an urgent need for a packer-sealed production fluid profile test string and method to solve the problem of inaccurate production fluid profile testing in wells with external casing crossflow. Summary of the invention

[0004] The present invention provides a packer-sealed production fluid profile test string and method, namely a packer-sealed production fluid profile test string and a production fluid profile test method, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problems of inaccurate production fluid profile testing and low production fluid profile testing accuracy in existing casing external crossflow wells.

[0005] One of the technical solutions of the present invention is achieved through the following measures: a packer-sealed production fluid profile test pipe string and method, including a first continuous oil pipe, a production profile logging instrument, a second continuous oil pipe and a packer connected together from top to bottom, and a depth counter is installed at the upper end of the first continuous oil pipe.

[0006] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned production profile logging instrument is an array probe production profile logging instrument, and the packer is a differential pressure packer.

[0007] The second technical solution of the present invention is achieved by the following measures: A method for testing a production liquid profile comprises the following steps: The first step is to calibrate the relationship between the depth counter and the well depth after the wellbore is cleaned; The second step is to determine the length L of the second coiled tubing according to the thickness H of the perforation cluster, so that the length L of the second coiled tubing satisfies: LH ≥ 4 meters; then adjust the depth counter so that the middle position of the packer corresponds to the zero-meter well depth; The third step is to lower the test string for the production profile of the packer into the well under the well production state. After the test string for the production profile of the packer is lowered to a certain depth in the well, the fluid is pumped into the first coiled tubing to seal the packer. The sealing performance of the packer is checked according to the changes in the wellhead pressure and production. If the packer is sealed properly, release the pressure and continue running; If the packer sealing is unqualified, the packer is stuck and the production fluid profile test string is used to check the packer; Step 4: When the lower end of the packer-sealed production profile test string is lowered to the first distance in front of the first perforation cluster at the toe end, the lowering speed is reduced, and the entry depth of the production profile test string is adjusted according to the depth of the depth counter. When the production profile logging instrument is located at the second distance in front of the first perforation cluster, the lowering of the packer-sealed production profile test string is stopped; Step 5: Start testing the first perforation cluster. Continue production after the wellhead pressure, production, and oil content reach a stable state. After the production discharges more than 1 times the horizontal wellbore volume, the test of the first perforation cluster is completed. Step 6: lift up the packer to seal the production profile test string, so that the second perforation cluster is located between the production profile logging tool and the packer; Step 7: After the production has discharged more than 1 times of the horizontal wellbore volume, the packer is pressurized and the second perforation cluster is tested. Step 8: After the test of the second perforation cluster is completed, the packer is unsealed; Step 9, repeating steps 6 to 7, completing the test of multiple horizontal well perforation clusters in sequence, and then taking out the test string of the production fluid profile of the packer; The tenth step is to compare the two sets of data measured by the production profiling logging instrument at the upper, middle and lower parts of the casing before and after the packer is set, and perform production interpretation and calculation of the contribution rate of each perforation cluster, and compare the contribution rate of each perforation cluster before and after the packer is set.

[0008] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: One of the data sets in the above-mentioned tenth step includes: before the packer is sealed, the production and profiling logging instrument measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing respectively; the other data set includes: after the packer is sealed, the production and profiling logging instrument measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing respectively.

[0009] In the eighth step, the test time of the second perforation cluster is 1.5 to 2.5 hours.

[0010] In the fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters.

[0011] In the first step above, after the wellbore is cleaned, a coupling locator is first installed at the lower end of the production profile test string to perform horizontal well logging, and then the relationship between the depth counter and the well depth is calibrated.

[0012] The present invention has a reasonable and compact structure and is easy to use. By setting a depth counter, the production and profiling logging instrument, the second continuous oil pipe and the packer can be accurately positioned, thereby improving the test efficiency of the perforation cluster. By setting the production and profiling logging instrument and the packer, each perforation cluster can be tested, thereby solving the problems of abnormal turbine speed caused by uneven dragging of the continuous oil pipe, large deviation in test results caused by the breaking of the oil, gas and water distribution state in the casing by the dragging of the continuous oil pipe, and inaccurate test of external channeling outside the casing. The invention can accurately test the contribution rate of the liquid production of each perforation cluster, provide a basis for reservoir understanding and optimization of fracturing schemes, and reduce the subsequent fracturing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 This is a schematic diagram of the main structure of Example 1 when in use.

[0014] The codes in the attached drawings are: 1 is the first continuous tubing, 2 is the production profile logging instrument, 3 is the second continuous tubing, 4 is the packer, and 5 is the depth counter. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1As shown, the packer-sealed production profile test string includes a first coiled tubing 1, a production profile logging instrument 2, a second coiled tubing 3 and a packer 4 which are sequentially connected from top to bottom, and a depth counter 5 is installed at the upper end of the first coiled tubing 1.

[0018] During use, by setting the depth counter 5, the production and profiling logging instrument 2, the second continuous oil pipe 3 and the packer 4 can be accurately positioned to improve the test efficiency of the perforation cluster. By setting the production and profiling logging instrument 2 and the packer 4, each perforation cluster can be tested, which solves the problems of abnormal turbine speed caused by uneven dragging of the continuous oil pipe, large deviation of the test result caused by the breaking of the oil, gas and water distribution state in the casing by the continuous oil pipe dragging, and inaccurate test of the outside of the casing. The contribution rate of the liquid production of each perforation cluster can be accurately tested, which provides a basis for reservoir understanding and optimization of fracturing schemes and reduces the subsequent fracturing construction costs.

[0019] The above-mentioned test string for the production fluid profile of the packer can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the production profile logging instrument 2 is an array probe production profile logging instrument, and the packer 4 is a differential pressure packer. According to the requirements, the array probe production profile logging instrument is an existing well-known technology, which can test the turbine speed, fluid density, water holdup, pressure and temperature in the casing, and the differential pressure packer can be set and unset multiple times, can be reused, and reduce the testing cost.

[0020] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the production profile testing method includes the following steps: The first step is to calibrate the relationship between the depth counter 5 and the well depth after the wellbore is cleaned; The second step is to determine the length L of the second coiled tubing 3 according to the thickness H of the perforation cluster, so that the length L of the second coiled tubing 3 satisfies: LH ≥ 4 meters; then adjust the depth counter 5 so that the middle position of the packer 4 corresponds to the zero-meter well depth; The third step is to lower the packer production profile test string into the well under the well production state. After the packer production profile test string is lowered into the well to a certain depth, the fluid is pumped into the first coiled tubing 1 to seal the packer 4. The sealing performance of the packer 4 is checked according to the wellhead pressure and production changes. If the sealing performance of the packer 4 is satisfactory, the packer 4 is unsealed by depressurizing and then continued to be lowered; If the sealing performance of the packer 4 is unqualified, the packer 4 is checked by testing the production profile of the packer 4.

[0021] Step 4: When the lower end of the packer-sealed production profile test string is lowered to the first distance in front of the first perforation cluster at the toe end, the lowering speed is reduced, and the entry depth of the production profile test string is adjusted according to the depth of the depth counter 5. When the production profile logging instrument 2 is located at the second distance in front of the first perforation cluster, the lowering of the packer-sealed production profile test string is stopped; Step 5: Start testing the first perforation cluster. Continue production after the wellhead pressure, production, and oil content reach a stable state. After the production discharges more than 1 times the horizontal wellbore volume, the test of the first perforation cluster is completed. Step 6: lift up the packer to seal the production profile test string, so that the second perforation cluster is located between the production profile logging instrument 2 and the packer 4; Step 7: After the production has discharged more than 1 times of the horizontal wellbore volume, the packer 4 is pressurized and sealed, and the second perforation cluster is tested; Step 8: After the test of the second perforation cluster is completed, the packer 4 is unsealed; Step 9, repeating steps 6 to 7, completing the test of multiple horizontal well perforation clusters in sequence, and then taking out the test string of the production fluid profile of the packer; The tenth step is to compare the two sets of data measured by the production profile logging instrument 2 at the upper, middle and lower parts of the casing before and after the packer 4 is set, respectively, to interpret the production and calculate the contribution rate of each perforation cluster, and to compare the contribution rate of each perforation cluster before and after the setting.

[0022] After comparing the two sets of data, production interpretation and contribution rate calculation of each perforation cluster can be performed, and the contribution rate of each perforation cluster before and after setting can be compared, which provides a basis for reservoir understanding and optimization of fracturing schemes and reduces the cost of subsequent fracturing construction.

[0023] The above-mentioned liquid production profile test method can be further optimized and / or improved according to actual needs: Embodiment 4: As an optimization of the above embodiment, one of the data sets in the tenth step includes: before the packer 4 is set, the production and profiling logging instrument 2 measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing; another data set includes: after the packer 4 is set, the production and profiling logging instrument 2 measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing. Production interpretation and calculation of the contribution rate of each perforation cluster are performed based on the turbine speed, fluid density, water holdup, pressure, and temperature data measured by the production and profiling logging instrument 2 at the upper, middle, and lower parts of the casing before and after the packer 4 is set. By comparing the contribution rates of each perforation cluster in the two groups, the contribution rate of the perforation cluster can be determined, which can provide a basis for subsequent fracturing transformation plans and reduce the cost of fracturing transformation.

[0024] Embodiment 5: As an optimization of the above embodiment, in step 8, the test time of the second perforation cluster is 1.5 to 2.5 hours. In this way, the test results of the second perforation cluster can be obtained when the wellhead pressure, production and oil content reach a stable state, thereby improving the accuracy of the test.

[0025] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, in the fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters. This can avoid the influence of the test result on the test string of the production profile and the perforation cluster due to the misalignment, and can improve the accuracy of the test result.

[0026] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, in the first step, after the wellbore is cleaned, a coupling locator is installed at the lower end of the production profile test string to perform horizontal well logging, and then the relationship between the depth counter 5 and the well depth is calibrated. In this way, after the production profile test string is lowered into the well, the corresponding relationship between the production profile test string and the perforation cluster can be ensured, the test efficiency is improved, and the perforation cluster can be accurately tested.

[0027] The specific process of the liquid production profile testing method in this embodiment is as follows: The first step is that the horizontal well G709, with a vertical depth of 4,300 meters and a horizontal section length of 1,000 meters, was transformed by staged fracturing with perforation bridge plugs, and then the wellbore was cleaned by drilling and grinding bridge plugs with continuous tubing. The 6,600-meter production profile test string with gamma and CCL magnetic locators at the lower end was lowered to the bottom of the artificial well, and the gamma and CCL magnetic locators were brought out to check the relationship between the depth counter 5 and the well depth; Step 2: The maximum single-stage perforation cluster thickness H of Well G709 is 2 meters. The length L of the second coiled tubing 3 is determined to be 8 meters. The depth counter 5 is adjusted so that the middle position of the packer 2 corresponds to the zero-meter well depth, that is, the half of the length of the packer 2 corresponds to the zero-meter well depth. The third step is to lower the test string for the production profile of the packer into the well under the well production state. After the test string for the production profile of the packer is lowered into the well for 200 meters, the first coiled tubing 1 is pressurized by a pump truck to seal the packer 4. The wellhead pressure and production drop sharply. The sealing performance of the packer 4 is qualified. The pressure is relieved to unseal the packer 4. The test string for the production profile of the packer is further lowered into the well. Step 4: The first perforation cluster at the toe of Well G709 is 5280 to 5282 meters. When the lower end of the packer sealing production profile test string reaches 5270 meters, the lowering speed is slowed down and the packer sealing production profile test string is lowered at a speed of 2 meters per minute. When the production profile logging instrument 2 is 2 meters away from the first perforation cluster, the lowering of the packer sealing production profile test string is stopped; Step 5: Start testing the first perforation cluster. After 6 hours of production at Well G709, the wellhead annulus pressure, production, and oil content reached a stable state. The wellbore volume of the horizontal section of the well was 11 cubic meters. After continuing to produce 11 cubic meters, the test of the first perforation cluster was completed. Step 6: The second perforation cluster at the toe end of Well G709 is from 5260 to 5262 meters. The packer is pulled up to seal the production profile test string. When the depth counter 5 shows 5264 meters, the pulling up of the packer is stopped to seal the production profile test string. Step 7: After producing 11 cubic meters, the surface pump truck pressurized and sealed the packer 4, sealing the position at 5264 meters, and began testing the second perforation cluster; Step 8: After testing for 2 hours, the test of the second perforation cluster is completed, and the packer 4 is unsealed after pressure relief; Step 9, repeating steps 6 to 7, completing the test of 10 horizontal well perforation clusters in sequence, and then taking out the test string of the production fluid profile of the packer; The tenth step is to interpret the production and calculate the contribution rate of each perforation cluster based on the turbine speed, fluid density, water holdup, pressure and temperature data measured by the production profile logging instrument 2 at the upper, middle and lower parts of the casing before and after the packer 4 is set. By comparing the contribution rates of each perforation cluster in the two groups (Table 1), it can be judged that the D and F perforation clusters have pipe leakage, and the A, B, E, I and J perforation clusters have higher production capacity contribution rates.

[0028] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A packer-sealed production fluid profile test string, characterized in that The invention comprises a first continuous oil pipe, a production and profiling logging instrument, a second continuous oil pipe and a packer which are sequentially connected from top to bottom. A depth counter is installed at the upper end of the first continuous oil pipe.

2. The packer sealing production fluid profile test string according to claim 1, characterized in that The production profile logging instrument is an array probe production profile logging instrument, and the packer is a differential pressure packer.

3. A method for testing a production profile using a packer as claimed in any one of claims 1 to 2 to seal a production profile testing string, characterized in that The steps include: The first step is to calibrate the relationship between the depth counter and the well depth after the wellbore is cleaned; The second step is to determine the length L of the second coiled tubing according to the thickness H of the perforation cluster, so that the length L of the second coiled tubing satisfies: LH ≥ 4 meters; then adjust the depth counter so that the middle position of the packer corresponds to the zero-meter well depth; The third step is to lower the test string for the production profile of the packer into the well under the well production state. After the test string for the production profile of the packer is lowered to a certain depth in the well, the fluid is pumped into the first coiled tubing to seal the packer. The sealing performance of the packer is checked according to the changes in the wellhead pressure and production. If the packer is sealed properly, release the pressure and continue running; If the packer sealing is unqualified, the packer is stuck and the production fluid profile test string is used to check the packer; Step 4: When the lower end of the packer-sealed production profile test string is lowered to the first distance in front of the first perforation cluster at the toe end, the lowering speed is reduced, and the entry depth of the production profile test string is adjusted according to the depth of the depth counter. When the production profile logging instrument is located at the second distance in front of the first perforation cluster, the lowering of the packer-sealed production profile test string is stopped; Step 5: Start testing the first perforation cluster. Continue production after the wellhead pressure, production, and oil content reach a stable state. After the production discharges more than 1 times the horizontal wellbore volume, the test of the first perforation cluster is completed. Step 6: lift up the packer to seal the production profile test string, so that the second perforation cluster is located between the production profile logging tool and the packer; Step 7: After the production has discharged more than 1 times of the horizontal wellbore volume, the packer is pressurized and the second perforation cluster is tested. Step 8: After the test of the second perforation cluster is completed, the packer is unsealed; Step 9, repeating steps 6 to 7, completing the test of multiple horizontal well perforation clusters in sequence, and then taking out the test string of the production fluid profile of the packer; The tenth step is to compare the two sets of data measured by the production profiling logging instrument at the upper, middle and lower parts of the casing before and after the packer is set, and perform production interpretation and calculation of the contribution rate of each perforation cluster, and compare the contribution rate of each perforation cluster before and after the packer is set.

4. The method for testing the production profile according to claim 3, characterized in that One of the data sets in the tenth step includes: before the packer is sealed, the production and profiling logging instrument measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing; the other data set includes: after the packer is sealed, the production and profiling logging instrument measures the turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing.

5. The method for testing the production profile according to claim 3 or 4, characterized in that In the eighth step, the second perforation cluster is tested for 1.5 to 2.5 hours.

6. The method for testing the production profile according to claim 3 or 4, characterized in that In the fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters.

7. The method for testing the production profile according to claim 5, characterized in that In the fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters.

8. The method for testing the production profile according to claim 3, 4 or 9, characterized in that In the first step, after the wellbore is cleaned, a coupling locator is installed at the lower end of the production profile test string to perform horizontal well logging, and then the relationship between the depth counter and the well depth is calibrated.

9. The method for testing the production profile according to claim 5, characterized in that In the first step, after the wellbore is cleaned, a coupling locator is installed at the lower end of the production profile test string to perform horizontal well logging, and then the relationship between the depth counter and the well depth is calibrated.

10. The method for testing the production profile according to claim 6, characterized in that In the first step, after the wellbore is cleaned, a coupling locator is installed at the lower end of the production profile test string to perform horizontal well logging, and then the relationship between the depth counter and the well depth is calibrated.

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