Portable one-way conduction and repeatable high-efficiency well-washing screen completion system and its application method

Abstract

The invention relates to the field of screen tube completion, in particular to a convenient one-way conduction screen tube completion system capable of repeating high-efficiency well washing. It includes a one-way through screen, an anchoring member and a quick docking and separation system for circulation. The one-way through screen is connected to the tail end of the anchoring member, and the initial end of the anchoring member is connected to the quick docking and separation system for circulation. The screen tube completion system provided by the present invention can realize one-way circulation well flushing. Since the system realizes one-way conduction circulation well flushing, it can effectively clear the coal powder accumulated in the annulus between screen holes, so it has a better well flushing effect .

Description

technical field [0001] The invention relates to the field of screen tube completion, in particular to a convenient one-way conduction screen tube completion system capable of repeating high-efficiency well washing. Background technique [0002] Screen completion is one of the commonly used well completion methods in oil and gas reservoir development, and is mainly used in sandstone oil and gas, coalbed methane and other production wells. Compared with sandstone oil and gas development, coal seams are easier to collapse and coal particles are finer. In the field of coalbed methane development, coal powder prevention and control has always been a key problem in the process of coalbed methane exploitation, especially in the process of coalbed methane horizontal well development. The powder is continuously spit out from the coal seam, blocking the cracks, cleats, screen holes, annular space and even the water pump near the wellbore, resulting in frequent pump inspections, result...

AI Technical Summary

Problems solved by technology

Therefore, in the existing screen completion system, once the screen is clogged, it can only be flushed section by section by lowering a hose (flushing pipe) with a smaller diameter into the screen.

The shortcomings of this method are mainly reflected in: the well flushing process must be carried out section by section, and the construction time is long; the flushing pipe can only flush the inner annulus between the screen pipe and the flushing pipe and the vicinity of the screen hole, and the most important screen pipe and coal seam Because the existing well flushing system cannot form effective high-pressure directional fluid in the annular space, fine sand and coal powder blocked in the annular space cannot be washed out of the wellbore, resulting in very limited flushing effect and short validity period , increased process costs, and low ultimate recovery

At the same time, when the well flushing pressure is too high, coal powder may be reversely pressed into near-wellbore micro-fractures or cleats, causing reservoir damage and ultimately affecting gas well productivity

In addition, because the existing flushing pipes lowered into the wellbore cannot effectively control the fluid direction, the effect of reservoir stimulation in gas lift operations, carbon dioxide and nitrogen replacement and other process engineering is not good

Images