Liquid production profile testing tubular column based on photoelectric transmission and testing method

Abstract

The invention relates to the technical field of oil and gas well oil testing and production testing, in particular to a liquid production profile testing tubular column based on photoelectric transmission and a testing method.The oil and gas well oil testing and production testing tubular column comprises a photoelectric composite cable, a coiled tubing, a centralizer, a headstall and a dipole acoustic logging instrument, and the coiled tubing, the centralizer, the headstall and the dipole acoustic logging instrument are sequentially connected together from top to bottom; the photoelectric composite cable penetrates through a coiled tubing and then is connected with a dipole acoustic logging instrument, the photoelectric composite cable can collect temperature data and sound data, and the dipole acoustic logging instrument comprises the following steps that firstly, a liquid production profile testing tubular column based on photoelectric transmission is assembled; the device is reasonable and compact in structure, integrated monitoring of the liquid production profile and dipole sound waves of the gas production horizontal well is achieved, the number of tripping-in times of the coiled tubing is reduced, the testing period and cost are shortened, guidance is provided for reservoir and fracturing effect evaluation, and according to temperature data and sound data, in combination with a dipole sound wave logging evaluation result, the gas production horizontal well is obtained. A high-precision liquid production profile interpretation result is obtained, a fracturing transformation scheme can be optimized, and the development degree of cracks is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well oil testing and production testing, and is a production liquid profile testing pipe column and a testing method based on photoelectric transmission. Background Art

[0002] Most of the oil and gas reservoirs that PetroChina will face in the future will be low-porosity and low-permeability oil and gas reservoirs. The fracturing transformation of oil and gas layers has become one of the main means to increase oil field production. It has been proven that multi-stage cluster volume fracturing of horizontal wells has become a key technology to improve EUR and benefit development. However, due to the strong heterogeneity of the reservoir, the production capacity after staged fracturing transformation varies greatly. It is urgent to understand the fracturing and fracture formation under different fracturing processes and construction parameters, as well as the production capacity effects of each stage and cluster after fracturing, in order to provide an important basis for verifying the classification of sweet spot reservoirs and optimizing fracturing transformation plans.

[0003] The patent document with application number 201910644976.5 and titled "A method and device for evaluating the effect of hydraulic fracturing of formations" discloses: the method is to perform array acoustic logging within a depth interval, construct dipole acoustic logging data in different directions, filter and normalize the dipole acoustic logging data in different directions, calculate the energy envelope of scattered waves before and after fracturing, and use the difference in shear wave velocity and scattered wave energy of dipole acoustic logging before and after fracturing 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 can also achieve the evaluation of the fracturing effect within a radial range of tens of meters around the wellbore.

[0004] The article titled Research on Evaluation Methods of Fracturing Effects in Low Permeability Reservoirs Based on Dipole Acoustic Logging Data disclosed that by comparing formation anisotropy before and after fracturing, the vertical extension height of the fractures and the complexity of fracture development can be accurately identified.

[0005] The patent document with application number CN201910640346.0 and titled "A production profile monitoring method based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring" discloses: the sound signal reflected by the single-mode acoustic optical fiber and the temperature signal reflected by the multi-mode temperature-sensitive optical fiber are processed by the DTS / DAS injection and production well production profile interpretation module, and finally the real-time flow rate and water content of each production layer section of the injection and production well are obtained, which can complete "a single well operation to achieve full well section production profile testing".

[0006] Dipole acoustic logging and production profile monitoring are two testing methods that can evaluate reservoirs and fracturing effects from different angles. The two processes have their own advantages. For gas well production profile testing, distributed optical fiber monitoring has obvious advantages over array multi-probe testing technology. However, at present, some wells have carried out dipole acoustic logging, and some wells have carried out production profile monitoring. It is rare to carry out two process tests at the same time in one well. Even if both processes need to be monitored, multiple well measurements are required. The advantages of the two test evaluation processes are not effectively complementary. A production profile test string and test method based on photoelectric transmission technology are urgently needed to reduce the total test cycle and cost of downhole production profile and dipole acoustic monitoring, comprehensively evaluate reservoirs and fracturing effects from different angles, and achieve accurate evaluation of reservoirs and fracturing effects. Summary of the invention

[0007] The present invention provides a production fluid profile test string and a test method based on photoelectric transmission, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of long construction period and high cost in the existing gas production horizontal well production fluid profile monitoring and dipole acoustic logging.

[0008] One of the technical solutions of the present invention is achieved through the following measures: a production profile test string based on photoelectric transmission, including a photoelectric composite cable and a continuous oil pipe, a centralizer, a bridle and a dipole acoustic logging instrument connected together from top to bottom, the photoelectric composite cable is connected to the dipole acoustic logging instrument after passing through the continuous oil pipe, and the photoelectric composite cable can collect temperature data and sound data.

[0009] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned optoelectronic composite cable may include at least three single-mode optical fibers, at least one multi-mode optical fiber and at least one cable, wherein one single-mode optical fiber is used to collect temperature data, one multi-mode optical fiber is used for sound data, and the cable and the other two single-mode optical fibers are connected to a dipole acoustic logging instrument.

[0010] The second technical solution of the present invention is achieved by the following measures: A testing method comprises the following steps: The first step is to assemble a production profile test string based on photoelectric transmission; The second step is to clean the wellbore and run the test string for the production profile based on photoelectric transmission. After 450 to 550 meters into the well, check the test string for the production profile based on photoelectric transmission. If it is normal, continue to run it; if it is abnormal, take it out for later inspection; In the third step, the production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well to collect sound data and formation temperature data respectively. After the collection is completed, the production profile test string based on photoelectric transmission is uniformly lifted up at the first speed, and the dipole acoustic logging instrument monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The fourth step is to perform staged fracturing on the horizontal well and conduct trial production by draining the well after fracturing; Step 5: Clean the sand and debris in the wellbore, then shut in the well and repeat step 2; Step 6: The production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well. When the well is shut in, the sound data and formation temperature data are collected again. The well is opened, preferably with 2 to 3 nozzles for production. When the production is stable, the sound data and formation temperature data are collected. Step 7: Shut down the well, and raise the production profile test string based on photoelectric transmission at a uniform speed at the second speed. The dipole acoustic logging instrument monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The eighth step is to analyze the anisotropy of the formation before and after fracturing based on the dipole acoustic logging data, evaluate the fracturing conditions of each perforation cluster, the fracture height and the degree of development of the fracturing network; and obtain high-precision interpretation results of the fluid production profile based on the fluid production profile monitoring data and combined with the dipole acoustic logging evaluation results.

[0011] The following is a further optimization and / or improvement of the second technical solution of the above invention: The first step is to assemble the liquid production profile test string based on photoelectric transmission, and check whether the liquid production profile test string based on photoelectric transmission works normally. If yes, proceed to the second step. If not, check the gas well liquid production profile and downhole television integrated test string.

[0012] The second speed is 5 to 7 m / min.

[0013] The second speed is the same as the first speed.

[0014] The present invention has a reasonable and compact structure and is easy to use. The present invention realizes integrated monitoring of the production profile of the gas-producing horizontal well and the dipole acoustic wave, reduces the number of coiled tubing runs, shortens the test cycle and cost, provides guidance for reservoir and fracturing effect evaluation, and obtains high-precision interpretation results of the production profile based on temperature data and sound data, combined with the dipole acoustic wave logging evaluation results, thereby optimizing the fracturing transformation plan and improving the degree of fracture development. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 This is a schematic diagram of the front cross-sectional structure of the first embodiment when in use.

[0016] The codes in the attached drawings are: 1 is a coiled tubing, 2 is a centralizer, 3 is a bridle, 4 is a dipole sonic logging instrument, and 5 is an optoelectronic composite cable. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1 As shown, the production profile test string based on photoelectric transmission includes a photoelectric composite cable 5 and a continuous oil pipe 1, a centralizer 2, a bridle 3 and a dipole acoustic logging instrument 4 connected together from top to bottom. The photoelectric composite cable 5 passes through the continuous oil pipe 1 and is connected to the dipole acoustic logging instrument 4, and the photoelectric composite cable 5 can collect temperature data and sound data.

[0020] The present invention realizes the integrated monitoring of the production profile of the gas-producing horizontal well and the dipole acoustic wave, reduces the number of coiled tubing runs, shortens the test cycle and cost, provides guidance for reservoir and fracturing effect evaluation, and obtains high-precision interpretation results of the production profile based on temperature data and sound data, combined with the dipole acoustic wave logging evaluation results, which can optimize the fracturing transformation plan and improve the degree of fracture development.

[0021] The above-mentioned production profile test string based on photoelectric transmission can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, the optoelectronic composite cable 5 includes at least three single-mode optical fibers, at least one multi-mode optical fiber and at least one cable, one of which is used to collect temperature data, one of which is used to collect sound data, and the cable and the other two single-mode optical fibers are connected to the dipole acoustic logging instrument 4.

[0022] According to the requirements, the cable is used to supply power to the dipole sonic logging instrument 4; the single-mode optical fiber is the existing well-known distributed optical fiber temperature sensing system (DTS), and the multi-mode optical fiber is the existing well-known distributed optical fiber acoustic sensing system (DAS). In this way, accurate temperature data and sound data can be obtained downhole.

[0023] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the test method includes the following steps: The first step is to assemble a production profile test string based on photoelectric transmission; The second step is to clean the wellbore and run the test string for the production profile based on photoelectric transmission. After 450 to 550 meters into the well, check the test string for the production profile based on photoelectric transmission. If it is normal, continue to run it; if it is abnormal, take it out for later inspection; In the third step, the production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well to collect sound data and formation temperature data respectively. After the collection is completed, the production profile test string based on photoelectric transmission is uniformly lifted up at a first speed, and the dipole acoustic logging instrument 4 monitors the formation anisotropy. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The fourth step is to perform staged fracturing on the horizontal well and conduct trial production by draining the well after fracturing; Step 5: Clean the sand and debris in the wellbore, then shut in the well and repeat step 2; Step 6: The production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well. When the well is shut in, the sound data and formation temperature data are collected again. The well is opened, preferably with 2 to 3 nozzles for production. When the production is stable, the sound data and formation temperature data are collected. The seventh step is to shut down the well and uniformly lift the production profile test string based on photoelectric transmission at a second speed. The second speed is the same as the first speed, and the second speed is 5 to 7 meters per minute. The dipole acoustic logging instrument 4 monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The eighth step is to analyze the anisotropy of the formation before and after fracturing based on the dipole acoustic logging data, evaluate the fracturing conditions of each perforation cluster, the fracture height and the degree of development of the fracturing network; obtain high-precision interpretation results of the fluid production profile based on the sound data and formation temperature data, combined with the dipole acoustic logging evaluation results.

[0024] In this way, the interpretation results of the fluid production profile can be used to analyze the anisotropy of the formation before and after fracturing based on the dipole acoustic logging data, and to evaluate the fracturing conditions of each perforation cluster, the fracture height, and the degree of development of the fracture network. Based on the fluid production profile monitoring data and combined with the dipole acoustic logging evaluation results, high-precision interpretation results of the fluid production profile can be obtained, which can optimize the fracturing transformation plan and improve the degree of fracture development.

[0025] The above test method can be further optimized and / or improved according to actual needs: Embodiment 4: As an optimization of the above embodiment, the first step is to assemble the production profile test string based on photoelectric transmission, check whether the production profile test string based on photoelectric transmission works normally, if yes, proceed to the second step, if not, check the gas well production profile and downhole TV integrated test string. In this way, abnormal conditions of the production profile test string based on photoelectric transmission can be discovered in time, the phenomenon of monitoring failure caused by abnormalities in the well can be avoided, and the monitoring cost can be reduced.

[0026] The specific process of the test method of this embodiment is as follows: The first step is to assemble a 6,600-meter production profile test string based on photoelectric transmission through the photoelectric composite cable 5. The ground test shows that the production profile test string based on photoelectric transmission works normally. The second step is the horizontal gas well N1901, which has a vertical depth of 3,500 meters and a horizontal section length of 1,000 meters. Before fracturing the N1901 well, the wellbore was cleaned and a production profile test string based on photoelectric transmission was lowered. After 500 meters into the well, the production profile test string based on photoelectric transmission was tested and continued to be lowered after it was found to be working normally. The third step is to lower the production profile test string based on photoelectric transmission to 4500 meters below the bottom of the artificial well, collect formation temperature data and sound data, and uniformly pull up the production profile test string based on photoelectric transmission at a first speed of 6 meters per minute. The dipole acoustic logging instrument 4 monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The fourth step is to perform 19-stage fracturing on Well N1901, and then drain the fluid for trial production after fracturing; The fifth step is to drill the fracturing bridge plug in the wellbore, clean the sand and debris in the horizontal well and gas well, then shut down the well, and run the production profile test string based on photoelectric transmission. After 500 meters into the well, test the production profile test string based on photoelectric transmission and continue to run it after it works normally; Step 6: The production profile test string based on photoelectric transmission is lowered to 4,500 meters below the bottom of the artificial well. When the well is shut down, the formation temperature and sound data are collected. The well is opened and two nozzles, 3mm and 4mm, are selected for production. When the production is stable, the formation temperature and sound data are collected. Step 7: After completing the optical fiber production profile monitoring, shut down the well, and uniformly pull up the production profile test string based on photoelectric transmission at a second speed of 6 m / min. The dipole acoustic logging instrument 4 monitors the formation anisotropy. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The eighth step is to analyze the anisotropy of the formation before and after fracturing based on the dipole acoustic logging data, and evaluate that the 2nd, 3rd, 9th, and 12th perforation clusters did not initiate fracturing, while the 1st, 5th, 13th, 18th, and 19th perforation clusters had developed fracture networks; based on the production profile monitoring data, the production contribution rate of each cluster was obtained, among which the 3rd, 9th, 13th, 18th, and 19th perforation clusters were the most important contributing sections. The monitoring results were comprehensively analyzed: the reservoirs were classified according to the reservoir classification standard established based on the recorded data, and the 3rd and 9th perforation clusters corresponded to Class I sweet spot reservoirs, the 13th and 18th perforation clusters corresponded to Class II sweet spot reservoirs, and the 1st, 5th, 12th, and 19th perforation clusters corresponded to Class III and IV sweet spot reservoirs, reflecting that good reservoir properties and complex fracture networks formed by fracturing are important factors for obtaining high production. At the same time, it confirms that the reservoir classification standard is relatively accurate. In the later stage, the drilling rate of high-quality reservoirs should be improved, the fracturing transformation plan should be optimized, and the degree of fracture development should be improved.

[0027] 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 production profile test column based on photoelectric transmission, characterized in that An optoelectronic composite cable and a coiled tubing, a centralizer, a bridle and a dipole sonic logging instrument which are sequentially connected from top to bottom. The optoelectronic composite cable passes through the coiled tubing and is connected to the dipole sonic logging instrument. The optoelectronic composite cable can collect temperature data and sound data.

2. The production profile test column based on photoelectric transmission according to claim 1, characterized in that The optoelectronic composite cable includes at least three single-mode optical fibers, at least one multi-mode optical fiber and at least one cable, wherein one single-mode optical fiber is used to collect temperature data, one multi-mode optical fiber is used to collect sound data, and the cable and the other two single-mode optical fibers are connected to a dipole acoustic logging instrument.

3. A testing method using the production profile testing column based on photoelectric transmission as claimed in claim 1 or 2, characterized in that The steps include: The first step is to assemble a production profile test string based on photoelectric transmission; The second step is to clean the wellbore and run the test string for the production profile based on photoelectric transmission. After 450 to 550 meters into the well, check the test string for the production profile based on photoelectric transmission. If it is normal, continue to run it; if it is abnormal, take it out for later inspection; In the third step, the production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well to collect sound data and formation temperature data respectively. After the collection is completed, the production profile test string based on photoelectric transmission is uniformly lifted up at the first speed, and the dipole acoustic logging instrument monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The fourth step is to perform staged fracturing on the horizontal well and conduct trial production by draining the well after fracturing; Step 5: Clean the sand and debris in the wellbore, then shut in the well and repeat step 2; Step 6: The production profile test string based on photoelectric transmission is lowered to the bottom of the artificial well. When the well is shut in, the sound data and formation temperature data are collected again. The well is opened, preferably with 2 to 3 nozzles for production. When the production is stable, the sound data and formation temperature data are collected. Step 7: Shut down the well, and raise the production profile test string based on photoelectric transmission at a uniform speed at the second speed. The dipole acoustic logging instrument monitors the anisotropy of the formation. After the horizontal section monitoring is completed, the production profile test string based on photoelectric transmission is raised; The eighth step is to analyze the anisotropy of the formation before and after fracturing based on the dipole acoustic logging data, evaluate the fracturing conditions of each perforation cluster, the fracture height and the degree of development of the fracturing network; and obtain high-precision interpretation results of the fluid production profile based on the fluid production profile monitoring data and combined with the dipole acoustic logging evaluation results.

4. The testing method according to claim 3, characterized in that The first step is to assemble the liquid production profile test string based on photoelectric transmission, and check whether the liquid production profile test string based on photoelectric transmission works normally. If yes, proceed to the second step. If not, check the gas well liquid production profile and downhole television integrated test string.

5. The test method according to claim 3 or 4, characterized in that The second speed is 5 to 7 m / min.

6. The test method according to claim 3 or 4, characterized in that The second speed is the same as the first speed.

7. The testing method according to claim 5, characterized in that The second speed is the same as the first speed.

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