Highly-deviated well casing pipe pre-filling filter sand pipe and sand prevention method

Abstract

The invention discloses a highly-deviated well casing pipe pre-filling filter sand pipe and sand prevention method. The pre-filling filter sand pipe comprises a central base pipe and an internal wire-wrapped screen covering the external side of the base pipe, wherein the external side of the internal wire-wrapped screen is covered with an external wire-wrapped screen pipe; filling annular space is formed between the internal wire-wrapped screen and the external wire-wrapped screen; the filling annular space is filled with ceramsite sand; the base pipe is covered with an upper end ring arranged on the upper ends of the internal wire-wrapped screen, the filling annular space and the external wire-wrapped screen and the upper end ring can seal and position; the base pipe is further covered with a compensator abutted against the upper end surface of the upper end ring to guarantee tightness of the pre-filling ceramsite sand in real time; the base pipe is also covered with a centering guide; the centering guide is arranged under the lower end ring; the compensator compensates loss of a gravel layer and deviation during the process via a pressure spring; and external force works on a rotary centering guide and can be eliminated, so the screen can be protected.

Description

technical field [0001] The invention relates to the sand control technology of a sand filter pipe, in particular to a casing pre-filling sand filter pipe of a high-inclination well and a sand control method. Background technique [0002] Gudao Oilfield has entered the later stage of development. In order to effectively exploit the remaining underground oil, the number of inclined wells has been increasing. At present, there are 556 deviated wells in Gudao Oilfield, accounting for 28.9% of the total number of wells opened, and the trend is still increasing. The special wellbore structure of the inclined well makes it different from the vertical well in terms of production conditions and technology adoption. The increasing number of deviated wells makes the production status more and more worthy of attention. Recently, with the continuous popularization and application of screen-type sand filter pipes, the sand control technology has reached a new level, but there are still ...

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned disclosed technology still cannot solve many problems, such as the inability to guarantee the compactness of the pre-packing, and the inability to replenish the gaps in time when the gravel layer naturally settles and loses production; Cause damage to the base pipe, that is, the screen pipe; for example, there is no graded gravel parameter design; and the sand control string has been working downhole for a long time, and it has to withstand the erosion of fluid production, steam injection, cavitation, etc., and the packing layer will always be lost. , there may be gaps

Because the outer protective sleeve is designed outside the sand control string, it is difficult to deal with the sand after the outer diameter is large, especially for highly deviated wells, which often require overhaul to deal with problems, etc.

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