Packer pack-off production profile testing string and method

Abstract

The present application relates to oil and gas well testing technology field, is a packer card seal production profile testing string and method, the former includes from top to bottom in turn connected together first coiled tubing, production profile logging instrument, second coiled tubing and packer, the first coiled tubing upper end is equipped with depth counter.The present application is reasonable and compact, through setting depth counter, can accurately position production profile logging instrument, second cooled tubing and packer, improve the testing efficiency of perforation cluster, through setting production profile logging instrument and packer, can test each perforation cluster, solve the problem of inaccuracy of testing, such as turbine revolution abnormality caused by uneven speed of coiled tubing dragging, large deviation of test result caused by coiled tubing dragging breaking casing inner oil and gas water distribution state, inaccuracy of tubing outside channeling test, can accurately test the contribution rate of each perforation cluster production, provide basis for reservoir understanding and fracturing scheme optimization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas well testing, and is a packer sealing fluid production profile testing pipe column and method. BACKGROUND

[0002] In recent years, more than 70% of the newly added proven oil reserves and more than 90% of the newly added proven natural gas reserves in China each year 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 object in China. For low-porosity and low-permeability reservoirs, large-scale volume modification is generally required to obtain commercial oil and gas flow. Large-scale segmented volume fracturing modification has become the main technology for production increase. However, due to strong reservoir heterogeneity, the productivity after fracturing modification varies greatly, and it is urgent to understand the productivity of each segment and cluster to provide an important basis for fine classification of reservoirs, optimization of fracturing modification schemes, and selection of layers for repeated fracturing.

[0003] Fluid production profile testing technology mainly includes crawler + fluid production profile testing instrument, coiled tubing + fluid production profile testing instrument, and fiber-optic coiled tubing testing technology. For fluid production profile testing of long horizontal sections and oil-water wells, the coiled tubing + fluid production profile testing instrument testing technology has obvious advantages. At present, there are coiled tubing + fluid production profile testing instrument uniform speed dragging type monitoring technology and coiled tubing + double fluid production profile testing instrument non-dragging type fine monitoring technology. However, for wells with poor cementing quality and no stress shielding, fluid may flow outside the casing during large-scale fracturing modification and production and drainage, resulting in inaccurate testing results of the coiled tubing + fluid production profile testing instrument. Therefore, there is an urgent need for a packer sealing fluid production profile testing pipe column and method to solve the problem of inaccurate fluid production profile testing of casing flow-out wells. SUMMARY

[0004] The present application provides a packer sealing fluid production profile testing pipe column and method, which overcomes the shortcomings of the prior art and effectively solves the problems of inaccurate fluid production profile testing and low fluid production profile testing precision of existing casing flow-out wells.

[0005] One of the technical solutions of the present application is achieved by the following measures: a packer sealing fluid production profile testing pipe column and method, comprising a first coiled tubing, a fluid production profile testing instrument, a second coiled tubing and a packer connected together in sequence from top to bottom, and a depth counter installed on the upper end of the first coiled tubing.

[0006] The following is a further optimization or / and improvement of the above-mentioned one of the technical solutions:

[0007] The above-mentioned fluid production profile testing instrument is an array probe fluid production profile logging instrument, and the packer is a differential pressure packer.

[0008] The second technical solution of the present application is realized through the following measures: a liquid production profile testing method comprises the following steps:

[0009] In the first step, after the wellbore is cleaned, the depth counter is calibrated in relation to the well depth;

[0010] In the second step, according to the perforation cluster thickness H, the length L of the second coiled tubing is determined, so that the length L of the second coiled tubing satisfies: L-H≥4 meters; then the depth counter is adjusted, so that the middle position of the packer corresponds to the zero-meter well depth;

[0011] In the third step, in the open well production state, the packer sealing liquid production profile testing string is lowered into the well, after the packer sealing liquid production profile testing string is lowered into the well to a certain depth, the packer is set by pumping fluid into the first coiled tubing, and the sealing property of the packer is checked according to the wellhead pressure and the production change;

[0012] If the sealing property of the packer is qualified, the packer is unsealed after pressure relief, and then the lowering continues;

[0013] If the sealing property of the packer is unqualified, the packer sealing liquid production profile testing string is pulled out to check the packer;

[0014] In the fourth step, when the lower end of the packer sealing liquid production profile testing string is lowered to the first distance in front of the toe first perforation cluster, the lowering speed is reduced, the well depth of the liquid production profile testing string is adjusted according to the depth of the depth counter, and when the liquid production profile testing instrument is located at the second distance in front of the first perforation cluster, the lowering of the packer sealing liquid production profile testing string is stopped;

[0015] In the fifth step, the first perforation cluster is tested, and after the wellhead pressure, the production and the oil content reach a stable state, the production continues, and after the production discharges more than 1 times the horizontal section wellbore volume, the test of the first perforation cluster is completed;

[0016] In the sixth step, the packer sealing liquid production profile testing string is pulled up, so that the second perforation cluster is located between the liquid production profile testing instrument and the packer;

[0017] In the seventh step, after the production discharges more than 1 times the horizontal section wellbore volume, the packer is set by pressure, and the second perforation cluster is tested;

[0018] In the eighth step, after the test of the second perforation cluster is completed, the packer is unsealed;

[0019] In the ninth step, the sixth step to the seventh step are repeated, and the tests of multiple horizontal well perforation clusters are sequentially completed, and then the packer sealing liquid production profile testing string is pulled out;

[0020] The tenth step is to compare two sets of data measured by the production profile logging instrument on the upper, middle and lower parts of the casing before and after the setting of the packer, respectively, to perform production interpretation and contribution rate calculation of each perforation cluster, and to compare the contribution rate of each perforation cluster before and after the setting of the packer.

[0021] The following is a further optimization or / and improvement of one of the above technical solutions:

[0022] One of the sets of data in the above tenth step includes turbine revolutions, fluid density, water holdup, pressure and temperature data measured by the production profile logging instrument on the upper, middle and lower parts of the casing before the setting of the packer, and the other set of data includes turbine revolutions, fluid density, water holdup, pressure and temperature data measured by the production profile logging instrument on the upper, middle and lower parts of the casing after the setting of the packer.

[0023] In the above eighth step, the testing time of the second perforation cluster is 1.5 to 2.5 hours.

[0024] In the above fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters.

[0025] In the above first step, after the wellbore is cleaned, a collar locator is installed at the lower end of the production profile testing string to perform horizontal well logging, and then the depth counter is calibrated with the relationship with the well depth.

[0026] The present application has reasonable and compact structure, is convenient to use, can accurately position the production profile logging instrument, the second coiled tubing and the packer through the setting of the depth counter, improve the testing efficiency of the perforation cluster, can test each perforation cluster through the setting of the production profile logging instrument and the packer, solve the problems of abnormal turbine revolutions caused by uneven speed of the coiled tubing dragging, large deviation of the test result caused by the coiled tubing dragging breaking the oil, gas and water distribution state in the casing, and inaccurate testing of the tubing outside channeling, can accurately test the production fluid contribution rate of each perforation cluster, provide basis for reservoir understanding and fracturing scheme optimization, and reduce subsequent fracturing construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are provided for the following embodiments. Figure 1 It is a schematic view of the front structure when the embodiment one is used.

[0028] The codes in the drawings are as follows: 1 is the first coiled tubing, 2 is the production profile logging instrument, 3 is the second coiled tubing, 4 is the packer, and 5 is the depth counter. DETAILED DESCRIPTION

[0029] The present application is not limited by the following embodiments, and the specific implementation can be determined according to the technical solution of the present application and the actual situation.

[0030] 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.

[0031] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0032] Example 1: As shown in the attached document Figure 1 As shown, the packer sealing 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 connected together from top to bottom. A depth counter 5 is installed at the upper end of the first coiled tubing 1.

[0033] During use, by setting the depth counter 5, the production profile logging instrument 2, the second coiled tubing 3, and the packer 4 can be accurately positioned, improving the testing efficiency of perforation clusters. By setting the production profile logging instrument 2 and the packer 4, each perforation cluster can be tested, solving the problems of abnormal turbine speed caused by uneven coiled tubing drag, large deviations in test results due to the disruption of the oil, gas, and water distribution state inside the casing caused by coiled tubing drag, and inaccurate testing due to external leakage outside the casing. It can accurately test the production contribution rate of each perforation cluster, providing a basis for reservoir understanding and fracturing scheme optimization, and reducing the cost of subsequent fracturing operations.

[0034] The packer-sealed product profile test string can be further optimized and / or improved as needed:

[0035] Example 2: As an optimization of the above examples, as shown in the appendix. 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 requirements, the array probe production profile logging instrument is a known existing technology that can test turbine speed, fluid density, water holdup, pressure, and temperature inside the casing. The differential pressure packer can be set and unsealed multiple times, allowing for reuse and reducing testing costs.

[0036] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, the method for testing the product fluid profile includes the following steps:

[0037] The first step is to calibrate the relationship between depth counter 5 and well depth after the well is cleaned.

[0038] The second step is to determine the length L of the second coiled tubing 3 based on 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.

[0039] Third step, in the open well production state, the packer seals the production profile test string into the well, and after the packer seals the production profile test string into the well to a certain depth, the packer 4 is pumped into the first continuous oil pipe 1 and set. According to the wellhead pressure and production change, the sealing performance of the packer 4 is checked.

[0040] If the sealing performance of the packer 4 is qualified, the packer 4 is released after pressure relief, and then the packer is further lowered.

[0041] If the sealing performance of the packer 4 is not qualified, the packer sealing production profile test string is pulled out to check the packer 4.

[0042] Fourth step, when the lower end of the packer sealing production profile test string is lowered to the toe of the first perforation cluster and the first distance, the lowering speed is reduced, the depth of the production profile test string is adjusted according to the depth counter 5, and when the production profile test instrument 2 is located in front of the first perforation cluster and the second distance, the packer sealing production profile test string is stopped.

[0043] Fifth step, the first perforation cluster is tested, and after the wellhead pressure, production and oil content reach a stable state, the production is continued, and after the production of more than 1 times the horizontal section wellbore volume is discharged, the test of the first perforation cluster is completed.

[0044] Sixth step, the packer sealing production profile test string is pulled out, so that the second perforation cluster is located between the production profile test instrument 2 and the packer 4.

[0045] Seventh step, after the production of more than 1 times the horizontal section wellbore volume is discharged, the packer 4 is set by pressure, and the second perforation cluster is tested.

[0046] Eighth step, after the test of the second perforation cluster is completed, the packer 4 is released.

[0047] Ninth step, the sixth step to the seventh step is repeated, and the test of multiple horizontal well perforation clusters is completed in turn, and then the packer sealing production profile test string is pulled out.

[0048] Tenth step, the two sets of data measured by the production profile test instrument 2 before and after the packer 4 is set are compared, the production is interpreted, the contribution rate of each perforation cluster is calculated, and the contribution rate of each perforation cluster before and after the setting is compared.

[0049] After comparing the two sets of data, the production is interpreted, the contribution rate of each perforation cluster is calculated, and the contribution rate of each perforation cluster before and after the setting is compared, which provides a basis for reservoir understanding and fracturing scheme optimization, and reduces the cost of subsequent fracturing construction.

[0050] The production profile test method can be further optimized or / and improved according to actual needs.

[0051] Example 4: As an optimization of the above example, one set of data in step ten includes: before packer 4 is set, the production profile logging instrument 2 measures turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing, respectively; the other set of data includes: after packer 4 is set, the production profile logging instrument 2 measures turbine speed, fluid density, water holdup, pressure, and temperature data at the upper, middle, and lower parts of the casing, respectively. 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 packer 4 is set, production interpretation and perforation cluster contribution rate calculation are performed respectively. By comparing the contribution rates of each perforation cluster in the two sets, the contribution rate of the perforation cluster can be determined. This can provide a basis for subsequent fracturing stimulation schemes and reduce fracturing stimulation costs.

[0052] Example 5: As an optimization of the above example, in step eight, the testing time for the second perforation cluster is 1.5 to 2.5 hours. This allows the test results for the second perforation cluster to be obtained when the wellhead pressure, production, and oil content are stable, thus improving the accuracy of the test.

[0053] Example 6: As an optimization of the above examples, as shown in the appendix 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 avoids the misalignment of the production profile test string and the perforation cluster affecting the test results, thus improving the accuracy of the test results.

[0054] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, in the first step, after the wellbore is cleaned, a coupling locator is first installed at the lower end of the production profile test string for horizontal well logging. Then, the relationship between the depth counter 5 and the well depth is calibrated. This ensures the correspondence between the production profile test string and the perforation cluster after the string is lowered into the well, improving testing efficiency and enabling accurate testing of the perforation cluster.

[0055] The specific process of the product fluid profile testing method in this embodiment is as follows:

[0056] The first step is to drill horizontal well G709 with a vertical depth of 4300 meters and a horizontal section length of 1000 meters. After staged fracturing using perforated bridge plugs, the wellbore is cleaned by drilling and grinding bridge plugs using coiled tubing. A 6600-meter production profile test string with gamma and CCL magnetic positioners connected at the lower end is lowered to the bottom of the artificial well. The gamma and CCL magnetic positioners are then removed, and the relationship between depth counter 5 and well depth is checked.

[0057] The second step is to determine that the maximum thickness H of the single-stage perforation cluster in well G709 is 2 meters, and the length L of the second continuous tubing 3 is 8 meters. Adjust the depth counter 5 so that the middle position of the packer 2 corresponds to the zero-meter well depth, that is, to make the half-length of the packer 2 correspond to the zero-meter well depth.

[0058] Third step, in the open well production state, the packer seals the production profile test string into the well, after the packer seals the production profile test string into the well for 200 meters, the pump truck is used to press the first coiled tubing 1, the packer 4 is set, the wellhead pressure and the yield are sharply reduced, the sealing performance of the packer 4 is qualified, the packer 4 is unsealed after pressure relief, and the packer sealing production profile test string continues to enter the well;

[0059] Fourth step, the toe end first perforation cluster of the G709 well is 5280 to 5282 meters, when the lower end of the packer sealing production profile test string is lowered to 5270 meters, the lowering speed is slowed down, 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;

[0060] Fifth step, the first perforation cluster is tested, after the G709 well produces for 6 hours, the wellhead annulus pressure, yield and oil content reach a stable state, the wellbore volume of the horizontal section of the well is 11 square, after 11 square continues to produce, the test of the first perforation cluster is completed;

[0061] Sixth step, the toe end second perforation cluster of the G709 well is 5260 to 5262 meters, the packer sealing production profile test string is lifted, when the depth counter 5 shows 5264 meters, the packer sealing production profile test string is stopped;

[0062] Seventh step, after 11 square is produced, the packer 4 is set by the ground pump truck, the sealing position is 5264 meters, and the second perforation cluster is tested;

[0063] Eighth step, the test is carried out for 2 hours, the test of the second perforation cluster is completed, and the packer 4 is unsealed after pressure relief;

[0064] Ninth step, the sixth step to the seventh step is repeated, and the test of the 10 horizontal well perforation clusters is sequentially completed, and then the packer sealing production profile test string is lifted;

[0065] Tenth step, according to the turbine revolutions, fluid density, water holding rate, 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, the yield is interpreted and the contribution rate of each perforation cluster is calculated, through the comparison of the contribution rates of two groups of each perforation cluster (Table 1), it can be judged that the D and F perforation clusters exist external channeling, and the A, B, E, I and J perforation clusters have higher contribution rates.

[0066] The above technical features constitute an embodiment of the present application, which has strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0067]

Claims

1. A method for testing a production profile of a production fluid profile testing string using a packer to seal off the production profile, characterized by The packer sealing production profile testing pipe column comprises, from top to bottom, a first coiled tubing, a production profile logging instrument, a second coiled tubing and a packer, and a depth counter is installed at the upper end of the first coiled tubing; The production profile logging instrument is an array probe production profile logging instrument, and the packer is a differential pressure packer; The production profile testing method using the packer sealing production profile testing pipe column comprises the following steps: Firstly, after the wellbore is cleaned, the relationship between the depth counter and the well depth is calibrated; Secondly, according to the thickness H of the perforation cluster, the length L of the second coiled tubing is determined so that the length L of the second coiled tubing satisfies L-H≥4 meters, and then the depth counter is adjusted so that the middle position of the packer corresponds to zero-meter well depth; Thirdly, in the open well production state, the packer sealing production profile testing pipe column is lowered into the well, the packer is set by pumping fluid into the first coiled tubing after the packer sealing production profile testing pipe column is lowered into the well to a certain depth, and the sealing property of the packer is checked according to the wellhead pressure and the production change; If the sealing property of the packer is qualified, the packer is unsealed after pressure relief, and then the lowering continues; If the sealing property of the packer is unqualified, the packer sealing production profile testing pipe column is pulled out to check the packer; Fourthly, when the lower end of the packer sealing production profile testing pipe column is lowered to the first distance before the toe first perforation cluster, the lowering speed is reduced, the well depth of the production profile testing pipe column is adjusted according to the depth of the depth counter, and when the production profile logging instrument is located at the second distance before the first perforation cluster, the lowering of the packer sealing production profile testing pipe column is stopped; Fifthly, the first perforation cluster is tested, and after the wellhead pressure, the production and the oil content reach a stable state, the production continues, and after the production discharges more than 1 times the volume of the horizontal section wellbore, the test of the first perforation cluster is completed; Sixthly, the packer sealing production profile testing pipe column is pulled up so that the second perforation cluster is located between the production profile logging instrument and the packer; Seventhly, after the production discharges more than 1 times the volume of the horizontal section wellbore, the packer is set by pressure, and the second perforation cluster is tested; Eighthly, after the test of the second perforation cluster is completed, the packer is unsealed; Ninthly, the sixth step to the seventh step are repeated, and the tests of multiple horizontal well perforation clusters are sequentially completed, and then the packer sealing production profile testing pipe column is pulled out; Tenthly, two sets of data collected by the production profile logging instrument at the upper, middle and lower parts of the casing before and after the packer is set are compared, the production interpretation and the contribution rate of each perforation cluster are calculated, and the contribution rates of each perforation cluster before and after the packer is set are compared.

2. The method of testing the production fluid profile using the packer- sealed production fluid profile testing string of claim 1, wherein One of the two sets of data in the tenth step comprises the turbine revolutions, the fluid density, the water holdup, the pressure and the temperature data measured by the production profile logging instrument at the upper, middle and lower parts of the casing before the packer is set; and the other set of data comprises the turbine revolutions, the fluid density, the water holdup, the pressure and the temperature data measured by the production profile logging instrument at the upper, middle and lower parts of the casing after the packer is set.

3. The method of testing the production fluid profile using the packer- sealed production fluid profile testing string of claim 1 or 2, wherein In the eighth step, the test time of the second perforation cluster is 1.5 to 2.5 hours.

4. The method of testing the production fluid profile using the packer- sealed production fluid profile testing string of claim 1 or 2, wherein In the fourth step, the first distance is 10 to 20 meters, and the second distance is 1.5 to 2.5 meters.

5. The method of producing fluid profile testing using packer- sealed fluid profile test string of claim 3, wherein In the fourth step, the first distance is 10 to 20 meters and the second distance is 1.5 to 2.5 meters.

6. The method of testing the production fluid profile using the packer- sealed production profile test string of claims 1 or 2 or 5, wherein In the first step, after the wellbore is cleaned, a collar locator is installed at the lower end of the production fluid profile testing pipe column to perform horizontal well logging, and then the depth counter is calibrated with the relationship with the well depth.

7. The method of testing the production fluid profile using the packer- sealed production fluid profile testing string of claim 3, wherein In the first step, after the wellbore is cleaned, a collar locator is installed at the lower end of the production fluid profile testing pipe column to perform horizontal well logging, and then the depth counter is calibrated with the relationship with the well depth.

8. The method of flow profile testing with packer off-the-shelf flow profile test string of claim 4, wherein In the first step, after the wellbore is cleaned, a collar locator is installed at the lower end of the production fluid profile testing pipe column to perform horizontal well logging, and then the depth counter is calibrated with the relationship with the well depth.

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