Downhole permanent casing damage dynamic clamping position measuring and monitoring method

Abstract

The invention belongs to the technical field of oil field production, and particularly relates to an underground permanent casing damage dynamic clamping position measuring and monitoring method. At least one casing damage dynamic clamping position measuring and monitoring device is communicated with an oil pipe in an underground casing damage prone area; and casing damage detection is carried out on the casing in the casing damage easy-to-occur area through the casing damage dynamic clamping position measuring and monitoring device fixed underground. When casing damage monitoring is carried out on a casing in one or more sections of casing damage prone areas, one or more casing damage well diameter monitors are communicated with an oil pipe, when a plurality of casing damage dynamic clamping position measuring and monitoring devices are connected, every two adjacent casing damage dynamic clamping position measuring and monitoring devices are in short connection through the oil pipe, and the two ends of each monitoring device are communicated with the oil pipe through threads. The method for detecting the casing damage through the casing damage dynamic clamping position measuring and monitoring device arranged in the casing pipe in the casing damage prone area for a long time replaces an existing method for detecting the casing damage by putting a casing damage detecting caliper into the well bottom. And data monitoring does not need well stopping operation, so that the casing damage detection cost is reduced, and the detection efficiency and quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield production, and in particular relates to an underground permanent casing damage dynamic positioning measurement and monitoring method. Background Art

[0002] With the in-depth development of oil fields, various blocks of the oil fields have seen large-scale deformation and damage of water well casings to varying degrees. The occurrence of large-scale casing damage in blocks will not only increase the cost of oil field development, but also seriously affect the production of the oil field.

[0003] In order to test whether the casing in the area prone to casing damage is damaged or deformed, the current casing damage detection method is to send a multi-arm (16, 24, 40, 60 arm) casing damage detection caliper into the bottom of the well and then lift the detector up to perform casing damage detection on the casing in the area prone to casing damage. Figure 1 and Figure 2 As shown, Figure 1 This is the working condition diagram of the deformed casing in the casing damage prone area before casing damage detection. The casing of the water well that has been in production for a long time is prone to deformation in the casing damage prone section, and the deformed and damaged casing will affect production. Figure 2 The figure is a schematic diagram of an existing casing damage detection method. The detection method is to drop a casing damage detection caliper to the bottom of the well, then lift the detector, and perform deformation detection on the casing through an expandable measuring ruler on the detector. The detection data is collected by the sensor on the instrument and transmitted to the well.

[0004] This method of sending the casing damage detection caliper to the bottom of the well and then performing casing damage detection on the section prone to casing damage has several defects. 1. Before performing casing damage inspection on the section prone to casing damage, it is necessary to perform well operations. The operation team will pull out the oil pipe from the well. On the one hand, it is necessary to shut down the well and stop production, which affects production efficiency. On the other hand, the operation cost of the operation team is high; 2. The logging team can only detect the casing damage status at the time, and cannot collect deformation data during the casing deformation process; 3. Affected by the detection cost and detection efficiency, the detection cycle of a single well is extended. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a downhole permanent casing damage dynamic positioning measurement and monitoring method, which replaces the existing method of dropping a casing damage detection caliper into the bottom of the well to detect casing damage by using a casing damage dynamic positioning measurement and monitoring device placed in the casing of the casing damage prone area for a long time to detect casing damage and continuously dynamically monitor the casing damage. The casing damage dynamic positioning measurement and monitoring device connected to the oil pipe realizes the dynamic detection of casing damage, which does not require the well to be stopped for operation, reduces the cost of casing damage detection, and improves the detection efficiency and quality.

[0006] The technical solution adopted by the present invention is: a method for measuring and monitoring casing damage in a permanent underground casing damage dynamic position, and the method for measuring and monitoring casing damage in a permanent underground casing damage dynamic position is: at least one casing damage dynamic position measurement and monitoring device is connected to the oil pipe in the casing damage prone area underground, and the casing damage deformation is dynamically measured and monitored by the casing damage dynamic position measurement and monitoring device fixed underground. Due to the different stratigraphic structures of different oil production areas in different oil fields, the depth of the casing damage prone area and the number of casing damage prone sections that cause damage to the underground casing are different. Therefore, the number and connection positions of the casing damage dynamic position measurement and monitoring devices should be determined according to the single well data of different oil production areas to ensure that the casing damage dynamic detection is performed on the casing in all casing damage prone areas of the single well.

[0007] Furthermore, when the downhole permanent casing damage dynamic positioning measurement and monitoring method is used to dynamically monitor casing damage in one or more casing damage prone areas, at least one casing damage dynamic positioning measurement and monitoring device is connected to the oil pipe in the casing damage prone area. The number and connection positions of the casing damage dynamic positioning measurement and monitoring devices in the dynamic monitoring method are determined based on the data of a single well in a certain oil production area.

[0008] Furthermore, when the oil pipe in the casing damage prone area is connected to a casing damage dynamic position measurement and monitoring device, both ends of the casing damage dynamic position measurement and monitoring device are connected to the oil pipe through threads. After the casing damage dynamic position measurement and monitoring device is connected to the oil pipe, the original well fluid channel remains unchanged. The situation of using only one casing damage dynamic position measurement and monitoring device for casing damage detection is generally used in the test stage of the underground permanent casing damage dynamic position measurement and monitoring method.

[0009] Furthermore, when the oil pipe in the casing damage prone area is connected to multiple casing damage dynamic position measurement and monitoring devices, two adjacent casing damage dynamic position measurement and monitoring devices are connected by short-circuiting the oil pipe to form a series of casing damage dynamic position measurement and monitoring devices, and both ends of the series of casing damage dynamic position measurement and monitoring devices are connected to the oil pipe through threads. After the series of casing damage dynamic position measurement and monitoring devices are connected to the oil pipe, the original well fluid channel remains unchanged. Multiple sets of series casing damage dynamic position measurement and monitoring devices can be used to perform casing damage dynamic detection on casing in multiple sections of casing damage prone areas.

[0010] Furthermore, the inner diameter and outer diameter of the tubing short-circuit connecting two adjacent casing damage dynamic positioning measurement and monitoring devices are the same as those of conventional tubing short-circuit. Except for the length, the tubing short-circuit has the same dimensions as conventional tubing short-circuit, and has high interchangeability.

[0011] The beneficial effects of the present invention are as follows: a method for measuring and monitoring casing damage permanently placed underground is provided, and a method for measuring and monitoring casing damage by placing a casing damage dynamic positioning measuring and monitoring device in the casing in the casing damage prone area for a long time replaces the existing method of dropping a casing damage detection caliper into the wellbore once for casing damage detection. The main advantages are as follows: (1) The downhole permanent casing damage dynamic positioning measurement and monitoring method realizes the dynamic detection of casing damage by using a casing damage dynamic positioning measurement and monitoring device connected to the oil pipe. Compared with the existing detection method of dropping a casing damage detection caliper into the bottom of the well, it does not require stopping the well for operation or changing the original tubing string, which greatly reduces the cost of casing damage detection and improves production efficiency.

[0012] (2) Compared with the existing detection method of dropping a caliper into the wellbore to detect casing damage, the downhole permanent casing damage dynamic positioning measurement and monitoring method can only detect the casing damage data and status at the time, and cannot collect casing damage data before the detection date. The former monitoring method adopts a permanent type, which can always maintain the monitoring data collection of the casing in the area prone to casing damage.

[0013] (3) Compared with the existing detection method of dropping a caliper to detect casing damage at the bottom of the well, the detection cost of the latter detection method is high and the detection efficiency is low, which leads to a longer detection cycle for a single well and affects production efficiency. The former detection method has a lower cost, better detection effect, and can be continuously detected, and the monitoring process does not affect production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a deformed casing in a casing damage prone area in a downhole in the background technology; Figure 2 It is a schematic diagram of dropping a casing damage detection caliper into the bottom of a well to perform casing damage detection; Figure 3 It is a schematic diagram of the connection position of the casing damage dynamic positioning measurement and monitoring device in the first embodiment; Figure 4 It is a schematic diagram of the connection position of the casing damage dynamic positioning measurement and monitoring device in the second embodiment; Figure 5 It is a schematic diagram of the connection position of the casing damage dynamic positioning measurement and monitoring device in the third embodiment; Figure 6 It is a data collection flow chart for dynamic monitoring of downhole casing damage in the fourth embodiment. DETAILED DESCRIPTION Example

[0015] Take the case of using the downhole permanent casing damage dynamic positioning measurement monitoring method to monitor casing damage of a certain section of casing in the well as an example. Figure 3As shown. For example, if the casing in a single well in a certain oil production block is monitored in an area prone to casing damage, when the oil pipe in the area prone to casing damage is connected to multiple casing damage dynamic positioning measurement and monitoring devices, two adjacent casing damage dynamic positioning measurement and monitoring devices are connected by short-circuiting the oil pipe to form a series of casing damage dynamic positioning measurement and monitoring devices. The operation team connects the series of casing damage dynamic positioning measurement and monitoring devices with the oil pipe in the vulnerable casing section to be monitored through the threads at both ends. After the casing damage dynamic positioning measurement and monitoring device is connected to the oil pipe, the original well fluid channel remains unchanged. The casing damage dynamic monitoring of the casing in the area prone to casing damage is performed by fixing the casing damage dynamic positioning measurement and monitoring device downhole, which is also a permanent casing damage dynamic monitoring method. Example

[0016] Based on the technical solution of embodiment 1, Figure 4 As shown, when the downhole permanent casing damage dynamic positioning measurement and monitoring method is used to perform casing damage dynamic monitoring on the casing in multiple casing damage prone areas downhole, a plurality of casing damage dynamic positioning measurement and monitoring devices connected in series are connected to the oil pipe in each casing damage prone area to monitor the casing damage in the multiple casing damage prone areas. The number of casing damage dynamic positioning measurement and monitoring devices in each casing damage prone area is determined according to the monitoring requirements of the oil production block. Example

[0017] like Figure 5 As shown, in the test phase of the downhole permanent casing damage dynamic position measurement and monitoring method, only one casing damage dynamic position measurement and monitoring device is used to complete the test. If only one casing damage dynamic position measurement and monitoring device is used, both ends of the monitoring device are connected to the oil pipe through threads. According to the test needs, at least one casing damage dynamic position measurement and monitoring device can be connected to two adjacent oil pipes at different depths in a test section of a casing damage prone area.

[0018] The above embodiment is a method for detecting casing damage by placing a casing damage dynamic positioning measurement and monitoring device in the casing of the casing damage prone area for a long time, which replaces the existing method of dropping a casing damage detection caliper into the bottom of the well to detect casing damage. The core is a method for dynamic continuous monitoring of casing damage permanently placed underground. The above monitoring method is not limited to the use of monitoring devices or equipment such as a casing damage dynamic positioning measurement and monitoring device fixed underground. No matter what kind of monitoring equipment fixed underground is used to detect casing damage in the casing damage prone area, it falls within the protection scope of this method for dynamic positioning measurement and monitoring of casing damage permanently placed underground. Example

[0019] The reason why the underground permanent casing damage dynamic positioning measurement and monitoring method in each of the above embodiments can replace the existing method of dropping a casing damage detection caliper into the bottom of the well for casing damage detection is that the existing data storage technology, wireless data acquisition and transmission technology, and wireless power supply and charging technology are all established existing technologies. The use of existing established technologies can realize continuous detection of casing damage in areas prone to casing damage through the underground permanent casing damage dynamic positioning measurement and monitoring method.

[0020] For example, a chip capable of storing data (or other components with data storage function) and a battery (or other wireless power supply) capable of supplying power to the components in the device are provided in the downhole casing damage dynamic positioning measurement and monitoring device, and the monitoring data stored in the downhole casing damage dynamic positioning measurement and monitoring device are collected regularly through the data collection instrument. The collected monitoring data is used to analyze the casing damage in the casing damage prone area to determine whether there is an initial or severe phenomenon, or the extent of the casing damage.

[0021] like Figure 6 As shown, Figure 6 The data collection flow chart for downhole casing damage monitoring using the downhole permanent casing damage dynamic positioning measurement and monitoring method. The casing damage dynamic positioning measurement and monitoring device placed in the downhole casing damage prone area (the device is fixed at a specified depth and layer) captures casing damage data through a sensor measuring ruler in contact with the inner wall of the casing. The sensor uses a high-precision sensor, which is similar to the principle of the measuring ruler of the existing 40-arm casing damage monitoring caliper. When the casing in the casing damage prone area is damaged and deformed, the measuring ruler equipped with the sensor transmits the captured casing deformation data to the data storage element or chip for storage, and can capture and store the real-time dynamic deformation data of the casing. The data acquisition instrument is used regularly to collect the casing damage data stored in the data storage element. The data acquisition instrument is sent to the downhole casing damage caliper monitoring device through the valve at the wellhead, and the data is collected through the wireless data sending and receiving elements, and the downhole battery can be charged through the wireless charger. A casing damage dynamic monitoring database is established for the casing damage data collected from the downhole, and dynamic monitoring of casing damage wells is realized, providing a guarantee for achieving stable production and growth of crude oil.

[0022] Compared with the existing detection method of dropping a casing damage detection caliper into the bottom of the well, the detection cost of the former is low, while the detection cost of the latter is high. First, the detection method of the latter requires the operation team to go up the well to remove the oil pipe from the casing every time the casing damage is detected. The cost of one operation is about 20,000 to 30,000 yuan, and the shut-in operation will affect production and reduce production efficiency. Second, the logging team is required to complete the testing operation to send the casing damage detection caliper to the bottom of the well and lift it to the wellhead. The cost of the logging team's testing operation is about 10,000 to 15,000 yuan per well. The downhole permanent casing damage dynamic positioning measurement and monitoring method does not require going up the well every time data is collected, nor does it require the logging team's logging vehicle to collect data. Only a simple winch can be used to send data collection instruments downhole, and data collection does not require shutting down the well, which greatly reduces the cost of casing damage detection without affecting production.

[0023] On the other hand, the detection method of dropping a casing damage detection caliper into the bottom of the well can only detect the casing damage data of the day, and cannot collect the dynamic data of casing damage before the detection day. That is, every time the casing damage data is needed, the casing damage detection caliper must be dropped into the bottom of the well to collect data. Due to the detection cost and long detection cycle, this detection method cannot realize frequent or continuous dynamic detection of casing damage in a single well, cannot monitor casing damage for a long time, and cannot obtain dynamic data of casing damage, which in turn affects production. However, the downhole permanent casing damage dynamic positioning measurement and monitoring method can dynamically monitor the casing after the casing damage caliper monitoring device is fixed in the well, and the obtained casing damage data is stored in the data storage element. According to production needs, the data acquisition instrument can be used regularly to collect casing damage data. Since this method has low casing damage detection cost, convenient detection, and short detection cycle, it can realize frequent detection of single wells. For sections where casing damage is prone to occur and is more serious, casing damage detection can be carried out once every 15 days, 30 days, 60 days or more than 90 days, and dynamic data of casing damage deformation can be obtained in time for stable production and increased production. Moreover, the detection method of dropping a caliper gauge to the bottom of the well for casing damage detection is limited by the detection cost and detection cycle. The casing damage detection is generally carried out once every one or two years, which is not conducive to the stable production and increase of the oil field.

[0024] The method of detecting casing damage by placing a casing damage dynamic positioning measurement and monitoring device in the casing in the casing damage prone area for a long time replaces the existing method of dropping a casing damage detection caliper into the bottom of the well to detect casing damage. After the oil pipe is raised and lowered, the casing damage dynamic monitoring device is installed in the casing damage prone area at the specified depth and layer, and the casing deformation can be measured daily. By collecting casing damage data regularly, long-term and periodic casing damage dynamic data collection can be achieved, providing guarantee for the stable production and increase of oilfield.

Claims

1. A method for measuring and monitoring the dynamic positioning of a permanent casing damage underground, characterized in that: The method for measuring and monitoring casing damage in a permanently installed underground casing damage dynamic position is as follows: at least one casing damage dynamic position measurement and monitoring device is connected to a tubing in an area prone to casing damage in the underground, and casing damage deformation is dynamically measured and monitored by the casing damage dynamic position measurement and monitoring device fixed in the underground.

2. The method for measuring and monitoring the dynamic positioning of permanent casing damage in underground wells according to claim 1 is characterized in that: When the downhole permanent casing damage dynamic positioning measurement and monitoring method is used to dynamically monitor casing damage in one or more casing damage prone areas, at least one casing damage dynamic positioning measurement and monitoring device is connected to the oil pipe in the casing damage prone area.

3. The method for measuring and monitoring the dynamic positioning of permanent casing damage in underground wells according to claim 2 is characterized in that: When the oil pipe in the casing damage prone area is connected to a casing damage dynamic position measurement and monitoring device, both ends of the casing damage dynamic position measurement and monitoring device are connected to the oil pipe through threads.

4. The method for measuring and monitoring the dynamic positioning of permanent casing damage in underground wells according to claim 2 is characterized in that: When the oil pipe in the casing damage prone area is connected to multiple casing damage dynamic position measurement and monitoring devices, two adjacent casing damage dynamic position measurement and monitoring devices are connected through a short circuit in the oil pipe to form a series of casing damage dynamic position measurement and monitoring devices, and both ends of the series of casing damage dynamic position measurement and monitoring devices are connected to the oil pipe through threads.

5. The method for measuring and monitoring the dynamic positioning of permanent casing damage in underground wells according to claim 4 is characterized in that: The inner diameter and outer diameter of the tubing short-circuit connecting two adjacent casing damage dynamic positioning measurement and monitoring devices are the same as those of the conventional tubing short-circuit.

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