Integral steam distribution apparatus for layered sand-prevention well

Abstract

The invention discloses an integral steam distribution apparatus for a layered sand-prevention well. The integral steam distribution apparatus comprises a distribution-injection device, a double-pipe insertion cap and a single-pipe insertion cap all connected in an order way from top to bottom. A distribution-injection core is disposed in the distribution-injection device; the distribution-injection device is provided with two single channels, namely an internal ring channel and an external ring channel; upper and lower water nozzles are formed on the distribution-injection core; the upper water nozzle is communicated with the external ring channel; the lower water nozzle is communicated with the internal ring channel; the external ring channel is downwardly communicated to an external course of the double-pipe insertion cap and finally to an upper steam injection layer; and the internal ring channel downwardly passes through internal cavity channels of the double-pipe channel and the single-pipe channel orderly and at last is communicated to a lower steam injection layer. An integral layered steam distribution pipe column is inserted into a layered sand-prevention releasing pipe column, so integral injection allocation is performed on the upper part of a releasing tool; steam is injected into each layer through a diversion channel via different flow channels; and the integral steam distribution apparatus for the layered sand-prevention well is characterized by layered steam injection and convenient test distribution during layered sand prevention.

Description

technical field [0001] The invention relates to a heavy oil thermal recovery process in the petroleum industry; in particular, it relates to an integrated steam distribution device for layered sand control wells. Background technique [0002] At present, heavy oil thermal recovery wells mostly adopt the method of layered sand control and general steam injection, which has the following disadvantages: on the one hand, the high and low permeability layers have different steam absorption, resulting in uneven production in the vertical direction of the oil layer; on the other hand, , High-temperature and high-pressure steam channeling along with the high-permeability layer forms large pores, and the steam channeling becomes more and more serious, which seriously affects the development effect. To solve this problem, an integrated steam distribution device for layered sand control wells was invented to solve the problem of layered steam injection while layered sand control in hea...

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Problems solved by technology

[0002] At present, heavy oil thermal recovery wells mostly adopt the method of layered sand control and general steam injection, which has the following disadvantages: on the one hand, the high and low permeability layers have different steam absorption, resulting in uneven production in the vertical direction of the oil layer; on the other hand, , high-temperature and high-pressure steam channeling along with the high-permeability layer forms large pores, and the steam channeling becomes more and more serious, seriously affecting the development effect

[0003] After searching, the same technology was not found

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