Improved Steam-Assisted Gravity Drainage Oil Recovery Method
A technology that assists gravity and steam. It is used in the production of fluids, earth-moving drilling, wellbore/well components, etc. It can solve the problems of high viscosity of formation crude oil, large seepage resistance of steam injection, and small heating radius.
Active Publication Date: 2018-09-04
CHINA PETROLEUM & CHEM CORP +1
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[0005] 2. The thickness of the oil layer is not large (10-25m), which is at the lower limit of the conventional steam-assisted gravity drainage technology (15m). Steam injection leads to a large heat loss in the top and bottom cap layers, and the formed steam chamber is small in volume, which affects the development effect
The heterogeneity of Chunhui Oilfield is relatively large, and the horizontal permeability is 41-1790×10 -3 μm 2 , lower permeability and strong reservoir heterogeneity will affect the steam rising speed and the lateral expansion of the steam chamber, affecting the development effect
In addition, the viscosity of formation crude oil is extremely high, close to 2000×10 4 mPa•s, which is much larger than similar foreign oil reservoirs, resulting in large steam injection seepage resistance and small heating radius, it is still difficult to effectively develop oil reservoirs with such a high viscosity by conventional steam-assisted gravity drainage development technology
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[0025] 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.
[0026] The improved steam-assisted gravity drainage oil recovery method of the present invention is applicable to oil layers with buried depth less than 1000m, continuous effective thickness of oil layers not less than 20m, and degassed crude oil viscosity greater than 50×10 under oil layer conditions. 4 mPa·s reservoir. like figure 1 as shown, figure 1 It is a flowchart of a specific embodiment of the improved steam-assisted gravity drainage oil recovery method of the present invention.
[0027] In step 101, two parallel steam-assisted gravity drainage horizontal wells are preheated. In the oil layer of the heavy oil reservoir, deploy two horizontal wells facing up and down in parallel, near the bottom of the oil layer, and keep a certain dis...
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The invention provides an improved steam assisting gravity oil discharging oil producing method. The method comprises the following steps of preheating two steam assisting gravity oil discharging horizontal wells in parallel distribution; injecting steam into the steam assisting gravity oil discharging horizontal well positioned at the upper part; using the steam assisting gravity oil discharging horizontal well positioned at the lower part as a producing well for production; respectively deploying two horizontal wells at the two sides of the steam assisting gravity oil discharging horizontal well pair, and using the two horizontal wells as steam assisting gravity oil discharging compensation wells; respectively injecting a certain amount of steam into the two horizontal wells used as the steam assisting gravity oil discharging compensation wells; and then, performing soaking and well opening production. The improved steam assisting gravity oil discharging oil producing method has the advantages that the horizontal well steam puff and huff is used; a region which is not involved by a conventional steam assisting gravity oil discharging steam cavity is sufficiently heated, so that the steam assisting gravity oil discharging steam cavity communicates a steam cavity formed through puff and huff heating; the steam involving range is expanded; the volume of the steam cavity is increased; further, the reserves loss is reduced; and the yield is improved.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for producing crude oil by steam-assisted gravity drainage, which improves the recovery rate of extra-super heavy oil reservoirs. Background technique [0002] Shengli Oilfield currently has proven heavy oil geological reserves of 6.4×10 8 t, of which the proven heavy oil in place in the eastern oil region is 5.89×10 8 t, currently used 4.69×10 8 t; Chunfeng and Chunhui oilfields were successively discovered in the western oil region, with proven geological reserves of 5128×10 4 t, currently used 2471×10 4 t. [0003] In 2011, the Chunhui Oilfield in Shengli Western Oilfield reported a controlled reserve of 32.61 million tons, but it was basically impossible to use the existing technology, mainly due to: [0004] 1. The viscosity of crude oil is extremely high, and the viscosity of degassed crude oil at formation temperature (23°C) is close to 2000×10 ...
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IPC IPC(8): E21B43/24
Inventor王增林李振泉王传飞吴光焕李伟忠韦涛牛丽娟李伟李洪毅刘西雷于建梅唐亮陈明铭路言秋杨艳霞邓宏伟隋永婷王一平
OwnerCHINA PETROLEUM & CHEM CORP