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Method for multi-medium steam huff-puff oil recovery in old area of heavy oil reservoir

A heavy oil reservoir and multi-media technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low oil-steam ratio, rising development cost, high energy consumption, etc., and achieve oil production and The effect of increasing the oil-steam ratio, improving fluid flowback capacity, and increasing the degree of vertical production

Inactive Publication Date: 2019-01-01
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the steam huff and puff has entered the late stage, with high water cut, low oil-steam ratio, and low formation pressure. After years of development, the reservoir has the characteristics of "high temperature and low pressure" and lacks sufficient production pressure difference; the reservoir is unevenly developed and the thermal efficiency of steam is low. , the heating radius of steam huff and puff for vertical wells is 20-25m; the development cost rises, and the benefit obviously deteriorates. High energy consumption and high cost are the major problems faced by steam huff and puff. It is urgent to develop, test, popularize and apply new effective replacement technologies for greatly improving recovery , to provide strong technical support for the efficient development of heavy oil and the continuous and stable production

Method used

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  • Method for multi-medium steam huff-puff oil recovery in old area of heavy oil reservoir
  • Method for multi-medium steam huff-puff oil recovery in old area of heavy oil reservoir

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Experimental program
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Effect test

Embodiment 1

[0050] This implementation is aimed at multi-medium steam huff and puff production in a certain block of Henan Province. The general situation of the reservoir is as follows:

[0051]The oil reservoir is buried shallowly, and the reservoir is loosely cemented, between 200-900m. The oil layer is thin and has serious heterogeneity. The thickness of a single layer is generally between 1-4m, the thickness of a combination of layers is generally between 3-10m, the permeability is 200-4000md, and the average permeability is 1050md. Crude oil has high viscosity and poor fluidity. The viscosity of degassed crude oil at 50°C is between 10000-16000mPa·s, and the recovery degree is 15.78%. The distribution of oil layers is scattered, and the efficiency of thermal recovery is relatively low. Most of the blocks can only be combined into a set of development strata, and the pure total thickness ratio of the development strata is 0.2-0.8, generally only about 0.5.

[0052] According to t...

Embodiment 2

[0067] This implementation is aimed at multi-medium steam huff and puff production for a reservoir in a well area in Xinjiang. The overview of the reservoir is:

[0068] The average throughput production is 10.6 cycles, and it has entered the middle and late stages of throughput. The comprehensive water cut is over 90%, the average effective thickness is 10.2m, the average porosity is 24.3%, the average permeability is 324mD, the average crude oil viscosity at 50°C in the reservoir is 20077mPa·s, and the oil-gas ratio Already lower than 0.08, the degree of recovery is 10.7%. The average daily oil production is less than 1.5t, and measures to improve the development effect are urgently needed.

[0069] The reservoir parameters of the horizontal well section are that the average thickness of the third section oil layer is 10.5m, the average porosity of the oil layer is 29.9%, and the average horizontal permeability is 1605mD, which belongs to the high porosity and high permeabil...

Embodiment 3

[0079] This implementation is aimed at the multi-media steam huff and puff exploitation of a certain block in Xinjiang. The overview of the reservoir is as follows:

[0080] Reservoir thickness is 0-34.1m, with an average of 8.1m; oil layer analysis porosity changes between 16.0%-34.08%, average 21.5%; oil layer analysis horizontal permeability changes from 20mD-2314mD, average 318mD. Crude oil density of gram group is 0.8963-0.962g / cm 3 , with an average of 0.9198g / cm 3 ; At 50°C, the viscosity of ground degassed oil is 225-8854mPa·s, with an average of 2423mPa.s; the viscosity-temperature response is sensitive, and the viscosity of crude oil decreases by 50%-70% when the temperature increases by 10°C. The depth of the middle part of the reservoir is 242m, the original reservoir pressure is 2.52MPa, and the pressure coefficient is 1.04. It is a structural and lithological shallow ordinary heavy oil reservoir. Steam stimulation began in 2005. Up to now, the cumulative oil-ga...

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Abstract

The invention provides a method for multi-medium steam huff-puff oil recovery in an old area of heavy oil reservoir. The method comprises the steps that the heavy oil reservoir with the lower pressure, low yield and low efficiency at the later stage of steam huff-puff is selected, and an implementation well is determined; water vapor is stopped to be injected into the oil reservoir at the later stage of steam huff-puff, and a urea foam solution is injected into the implementation well; then the water vapor continues to be injected for steam huff-puff; and after soaking, the well is opened forproduction and oil recovery, wherein on the basis that the weight percentage of the urea foam solution is 100%, the urea foam solution comprises, by weight, 30-35% of urea, 1-5% of foaming agents andthe balance water. According to the method, formation energy can be supplemented, the steam huff-puff producing radius and the swept volume are increased, and the flowback ability of a fluid is improved; the steam huff-puff period can be prolonged, the longitudinal producing degree is increased, and the steam huff-puff development effect is improved; and under the condition that the periodically injected steam volume is not changed, the periodic oil yield and the oil vapor ratio are increased by 40% or above.

Description

technical field [0001] The invention belongs to the technical field of oil recovery in oil fields, and relates to a multi-media steam huff and puff oil recovery method in the mature area of ​​a heavy oil reservoir. Background technique [0002] The conventional steam huff and puff technology is to inject steam into the heavy oil reservoir, and use the heat carried by the steam to heat the heavy oil. Yield. The specific operation plan is to inject a certain amount of steam into the oil layer, and then soak the well for a period of time to spread the heat carried by the steam to the oil reservoir. After the well is soaked, the well is opened for blowout. [0003] At present, the steam huff and puff has entered the late stage, with high water cut, low oil-steam ratio, and low formation pressure. After years of development, the reservoir has the characteristics of "high temperature and low pressure" and lacks sufficient production pressure difference; the production of the rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/16E21B43/24
Inventor 张运军沈德煌李秀峦郑华席长丰齐宗耀王梦颖董志国罗建华
Owner PETROCHINA CO LTD
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