Multi-layer multi-section continuous oil testing system without lifting tubular column and operation method thereof

Abstract

The invention relates to a multi-layer multi-section continuous oil testing system without lifting a tubular column. The system is connected on the downhole testing tubular column in series and comprises an upper sub-system, a plurality of layered testing systems and a lower sub-system which are sequentially connected in series along the axial direction of the tubular column, wherein the upper sub-system comprises a manifold circulating valve, a main testing valve, a full-bore pressure gage support barrel, a safe connector and a top hydraulic packer which are sequentially connected in series along the axial direction of the tubular column. The plurality of layered testing systems are sequentially connected on the tubular column in series along the axial direction of the tubular column, each layered testing system corresponds to one oil layer, and each layered testing system comprises a hydraulic switching valve, a safe connector and a layered hydraulic packer. The lower sub-system comprises a hydraulic sliding sleeve, a pressure transmitting connector and a monitoring pressure gage which are sequentially connected in series along the axial direction of the tubular column. By means of the system, multi-layer and multi-section continuous testing, capacity increasing revamp, liquid discharging and a series of downhole operation processes can be completed without lifting the tubular column, and the system has the advantages of being simple in construction operation, convenient to assemble, short in construction period and the like.

Description

technical field [0001] The invention relates to a multi-layer testing, injection and production tool for oil and gas wells, in particular to a multi-layer continuous oil testing system without running down the pipe string and its operating method. Background technique [0002] In the oil (gas) well, there are multiple perforated intervals that need to obtain oil test data separately, so layered oil test is required. The traditional layered oil testing method uses lower bridge plugs or cement plugs to seal the tested layers, and then goes back to the upper layer layer by layer for oil testing. Its disadvantages are that the pipe strings and bridge plugs (or cement injection plugs) are lowered many times, the construction period is long, the speed is slow, the cost is high, and the oil and gas layers are easily polluted. [0003] US Patent No. 2006 / 0207764 discloses an example of a multi-layer test, injection, production system. This patent relates to an assembly that enable...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the traditional layered oil testing technology described in the background technology, such as multiple tripping down of the pipe string, lowering of bridge plugs (or cementing plugs), long construction period, high cost, and easy formation pollution, and the US patent setting The parasitic pressure transmission pipeline still affects the downhole testing efficiency. The purpose of the present invention is to provide a multi-layer continuous oil testing system and its operation method without running the string. It can complete a series of downhole operations such as multi-layer and multi-stage continuous testing, production stimulation transformation, and liquid drainage. It has outstanding advantages such as simple construction operation, convenient assembly, and short construction period.

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