Filling, sand prevention and steam injection integrated device and operating method using same

Abstract

The invention relates to the technical field of oil-gas exploration and development, in particular to a filling, sand prevention and steam injection integrated device, and further, an operating methodfor conducting operating by using the filling, sand prevention and steam injection integrated device. The filling, sand prevention and steam injection integrated device provided by the invention comprises a filling inner pipe, a filling outer pipe, a first sealing unit and a second sealing unit. Through the integrated design of the filling, sand prevention and steam injection device, filling, sand prevention and steam injection operation can be conducted through a set of pipe strings, the process program is simplified, the construction period is shortened, the operating cost is lowered, and complex situations are also avoided; and secondly, through cooperative arrangement of the first sealing unit and the second sealing unit, the problem of shaft sealing in the processes of filling, sandprevention and multi-cycle steam injection is effectively solved, it is ensured that sealing can be kept for a long term in the processes of filling, sand prevention and multi-cycle steam huff and puff, and the lasting and efficient sealing property is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to an integrated device for filling, sand control and steam injection. The invention also relates to an operation method using the integrated device for filling, sand control and steam injection. Background technique [0002] In the process of oil and gas field development, heavy oil resources are an important resource in oil field development. Due to the high viscosity of crude oil, steam injection thermal recovery is generally used for exploitation. In order to ensure wellbore safety, long-term effect and steam injection quality, effective The wellbore is isolated and sealed; at the same time, because most heavy oil reservoirs are loose and easy to produce sand, it is necessary to carry out filling and sand control operations before steam injection thermal recovery. Therefore, the wellbore isolation and sealing needs to meet the high-pressure seali...

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Problems solved by technology

At present, the packer for thermal recovery well adopts the design concept of conventional packer. Due to the high temperature of steam injection, in order to ensure the safety of the wellbore and the quality of steam injection, and to realize the isolation of the wellbore under high temperature and high pressure, the strength of the downhole sealing cylinder used is compared. It has the characteristics of no softening at high temperature and no deformation at high pressure. Due to the performance of the sealing tube, this conventional packer has the problem of being difficult to compress and set in the wellbore with limited size; it cannot effectively meet the requirements of sand control during packing. Normal temperature and high pressure sealing requirements, resulting in sand stuck pipe string during sand control, resulting in overhaul operations

[0004] On the other hand, although the thermal recovery filling tools commonly used at present can meet the sand control process requirements of thermal recovery well filling, they are prone to seal failure during steam injection, and cannot meet the high temperature and high pressure sealing requirements of multiple rounds of steam injection and production , during steam injection, the filling tool is prone to failure. In order to ensure the safety of steam injection, it is usually necessary to lower the bridge plug and close-fitting again to seal the annular space, which not only increases the operation process but also increases the operation cost. Moreover, multiple operations affect the The effect of steam injection in thermal recovery wells increases safety hazards

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