Automatic modulation and monitoring zonal injection method for water injection well and system thereof

Abstract

The invention relates to an automatic modulation and monitoring zonal injection method for water injection well and a system of the method. The method comprises the following steps: 1) a ground control system inputs a set flow value into a downhole modulation water segregator; 2) actual flow data of downhole water injection zonal levels are acquired, wherein the actual flow data comprise actual flow values, actual pressure values and actual temperature values; and 3) the downhole flow data acquired in the step 2) are compared with the flow value set in the step 1) and modulation water injection is carried out. The invention provides an automatic modulation and monitoring zonal injection method for water injection well and system of the method, thus no manual control is needed, monitoring of long term is realized, modulation time is shortened and labor intensity is reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas detection, and relates to a method and system for flow measurement, adjustment, monitoring and dispensing of water injection wells, in particular to an automatic measurement, adjustment, monitoring and distribution of water injection wells that can work underground for a long time methods and systems. Background technique [0002] At present, the water distribution methods commonly used in the oil and gas field mainly include the following: [0003] 1. The traditional throwing-and-fishing water distribution method: it mainly uses steel wire and other tools to fish the downhole water nozzle. Its shortcomings include the following aspects: ①The real-time performance of measurement and adjustment is poor, and the water nozzle cannot be adjusted in time according to the downhole conditions ; ② Low deployment efficiency and low precision of water distribution, it is impossible to achieve fine layered water ...

AI Technical Summary

Problems solved by technology

[0003] 1. The traditional throwing-and-fishing water distribution method: it mainly uses steel wire and other tools to fish the downhole water nozzle. Its shortcomings include the following aspects: ①The real-time performance of measurement and adjustment is poor, and the water nozzle cannot be adjusted in time according to the downhole conditions ; ② Low deployment efficiency and low precision of water distribution, it is impossible to achieve fine layered water injection downhole; ③ The workload of fishing is heavy, and the tools for fishing are also relatively complicated. With the increasing difficulty of oilfield development and the advancement of drilling and production technology, , ultra-deep wells, inclined wells, high-inclination wells and horizontal wells account for an increasing proportion, and the success rate of fishing during construction is also low, and it is easy to cause accidents in the process of fishing.

[0004] 2. The method of deploying water while testing: this method runs the cable into the downhole and deploys the tester. After the formation is successfully set, by adjusting the opening of the water nozzle, a better underground layered water injection effect is achieved, and real-time monitoring is also realized. However, it also has its own disadvantages: ① Since the instrument is taken out after only a few hours of each measurement and adjustment, the water nozzle of the downhole water distributor is in a fixed state. If the formation pressure or water injection pressure fluctuates, the water distributor cannot realize automatic adjustment. , resulting in inaccurate water injection; ②It can only realize short-term real-time monitoring of flow rate, but cannot realize long-term monitoring; ③When it is necessary to adjust the layered flow rate, it must first complete the seat layer before adjustment, the process is complicated and the workload is relatively large; ④For When the water nozzle is pulled or adjusted, it will also face problems such as the difficulty of docking the highly deviated well and the horizontal well; ⑤ When the seal of the packer needs to be checked, it is necessary to pull the special seal inspection device again to realize the seal inspection

The disadvantages of this method are: ①The flow rate is controlled by observing the change of the water injection volume on the ground, and the injection accuracy is relatively low; ②The state of the water distributor is controlled by pumping water pressure, and the deployment time is too long; ③It can only realize one-way transmission from the ground to the downhole , unable to monitor water injection and downhole conditions in real time

④ The problem of interlayer interference cannot be avoided. Since there is no downhole flowmeter, the state of downhole layering cannot be known

[0006] Although some of the water distribution devices used in these water distribution methods are low in cost and simple in fishing tools, they have relatively poor performance in stratified water distribution efficiency, stratified water distribution accuracy, long-term water distribution monitoring, and direct-reading two-way communication. Big flaws, especially most of the downhole water distributors do not have independent flowmeters at present, so it is impossible to measure and adjust the flow in real time for a long time, so as to determine the cumulative water injection flow

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