Multi-cyclic huff-and-puff late production method for thin heavy oil reservoirs

A technology for heavy oil reservoirs and production methods, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve problems such as pressure reduction and energy reduction, and achieve the reduction of crude oil viscosity, prolongation of cycle production time, and improvement of Effects of steam sweep coefficient and thermal efficiency and displacement efficiency

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In addition, the formation is deficient, resulting in a decrease in pressure and a drop in energy

Method used

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  • Multi-cyclic huff-and-puff late production method for thin heavy oil reservoirs

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Embodiment Construction

[0017] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0018] Such as figure 1 as shown, figure 1 It is a flow chart of the multi-round huff and puff post-exploitation method of the thin-layer heavy oil reservoir of the present invention. Before applying the multi-round huff and puff post-exploitation method of the thin-bed heavy oil reservoir of the present invention, a rough screening should be carried out according to the geological characteristics and development status of the heavy oil reservoir, and the reservoir meets the following conditions: the buried depth of the reservoir is ≤ 1400m , effective oil layer thickness ≤ 6.0m, permeability ≥ 300×10 -3 μm 2 , crude oil viscosity ≤ 20000mPa.s under reservoir conditions, without the influence of bottom water. Reservoir inclination angle ≤ 5°....

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Abstract

The invention provides a multi-cyclic huff-and-puff late production method for thin heavy oil reservoirs. The method includes the steps of 1, injecting a well with steam; 2, during steam injection, injecting with nitrogen and micro-emulsion viscosity reducer; 3, shutting in the well; 4, lifting up a steam injection string, tripping in a production string, and performing pumping production. According to the method, aiming at the contradiction that fast progressive decrease, fast water content increase and energy decrease in the late period of thin heavy oil reservoir multi-cyclic huff-and-puff production worsen the production effect, the nitrogen and the micro-emulsion viscosity reducer are used to assist in steam enhanced thermal recovery before conditions of transferring to steam flooding are not met, reservoir energy is supplemented, steam conformance efficiency, thermal efficiency and displacement efficiency are improved, and multi-cyclic huff-and-puff production effect of thin heavy oil reservoirs is improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a multi-round huff and puff post-production method for thin-bed heavy oil reservoirs. Background technique [0002] Thin heavy oil reservoirs mainly adopt two development methods: conventional production and steam huff and puff. At present, there is basically a blank in the development of 2-6m thick heavy oil reservoirs at home and abroad, especially in the technology of improving the recovery effect in the later stages of multiple steam stimulation cycles. After 4-5 cycles of steam injection huff and puff, the effect becomes worse, and as the number of cycles increases, the oil production per cycle decreases. The flow radius of crude oil is between 40m and 50m after steam huff and puff of thin layer heavy oil for 4 to 5 cycles, and the remaining oil saturation in the interwell area is basically between 0.49 and 0.56. As the heating cycle increases, the heatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22E21B43/16
Inventor 王世虎唐培忠于田田张紫军殷方好宋丹贺文媛王善堂刘艳平马爱青孟秋玉
Owner CHINA PETROLEUM & CHEM CORP
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