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Method for determining steam drive well network form of horizontal well to increase recovery ratio

A technology for steam flooding and horizontal wells, which is applied in wellbore/well components, production fluids, earth-moving drilling, etc., to achieve the effect of enhancing oil recovery and improving oil recovery.

Active Publication Date: 2018-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam flooding pattern of horizontal wells is completely different from that of vertical wells. The steam flooding of horizontal wells is linear flooding, and its steam flooding pattern deployment is quite different from that of vertical wells. Due to the limitation of the number of wells in the TARV horizontal well steam flooding test area in Wilmington It is a face-to-face well pattern with two injections and three productions. For the overall horizontal well block, how to configure the injection-production well pattern has no precedent at home and abroad. It is necessary to study the adaptation of different well patterns to different types of reservoirs. sex

Method used

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  • Method for determining steam drive well network form of horizontal well to increase recovery ratio
  • Method for determining steam drive well network form of horizontal well to increase recovery ratio
  • Method for determining steam drive well network form of horizontal well to increase recovery ratio

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1: The buried depth of the oil layer in a certain block is -530--700m, the thickness of the oil layer is 6.2-17.8m, the porosity is 23.9-39.3%, and the permeability is 1975-7782mD, which is a high-porosity and high-permeability reservoir. The viscosity of surface degassed crude oil is 9860mPa·s at 50°C, and 57211mPa·s at reservoir temperature (34°C). Since the block was discovered in 2007 and developed using horizontal well HDNS steam huff and puff in 2009, the total number of production wells is 112, the daily oil production capacity of a single well is 8.7t / d, the comprehensive water cut is 66%, and the cumulative oil production is 18.1×10 4 t, cumulative steam injection 39.78×10 4 t, the recovery degree is 1.7%, the average huff and puff cycle of a single well is 2 to 3, the maximum is 4 cycles, the formation pressure is about 2.8MPa, and the predicted recovery rate is 22.1%.

[0038] According to the steam flooding screening criteria, this block meets the s...

Embodiment 2

[0055] Example 2: The buried depth of the oil layer in a certain block is -1300~-1430m, the thickness of the oil layer is 2~12m, the average porosity is 32.8%, and the average permeability is 4913mD, which belongs to high porosity and high permeability reservoir. The viscosity of ground degassed crude oil at 50°C is 22×10 4 ~38×10 4 mPa·s, the viscosity of surface degassed crude oil is greater than 12×10 at reservoir temperature (68°C) 4 mPa·s, is a structure-lithology super heavy oil reservoir with edge and bottom water. Since 2007, the block has been developed by using HDCS steam huff and puff in horizontal wells. There are 34 production wells in total, the daily oil production capacity of a single well is 9.8t / d, the comprehensive water cut is 69%, and the cumulative oil production is 27.73×10 4 t, cumulative steam injection 33.68×10 4 t, the recovery degree is 13.0%, the average huff and puff cycle of a single well is 6-7, the maximum is 11 cycles, the formation pressur...

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Abstract

The invention provides a method for determining a steam drive well network form of a horizontal well to increase a recovery ratio. The method for determining the steam drive well network form of the horizontal well to increase the recovery ratio includes the steps of selecting physical property parameters of a steam drive oil layer of the horizontal well; optimizing deployment of the horizontal well; adopting an HDCS or HDNS mode for steam huff and puff before drive conversion; determining the steam drive well network form of the horizontal well; determining the drive conversion timing of steam drive; determining other parameters of the steam drive to conduct development of the steam drive. The method for determining the steam drive well network form of the horizontal well to increase therecovery ratio is designed especially for a super heavy oil deposit in a shallow and thin layer and a super heavy oil deposit in a middle deep layer, the well network form of conversing steam huff andpuff of the horizontal well into the steam drive is provided, and the oil driving effect can be improved, and the recovery ratio is greatly increased.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to a method for improving recovery rate by determining the form of horizontal well steam flooding well pattern. Background technique [0002] Since the "Eleventh Five-Year Plan", through the research of supporting technologies for thermal recovery of horizontal wells and the transformation of development concepts, the application field and scale of horizontal wells in Shengli Oilfield have continued to expand, and the application of horizontal wells in heavy oil reservoirs has also changed from scattered to integrated. Horizontal wells have been widely used in various heavy oil reservoirs with different burial depths, different viscosities, and different thicknesses, involving a total of 18 units, covering hundreds of millions of tons of geological reserves. In recent years, horizontal wells have accounted for more than 50% of new wells drilled in thermal recovery of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/24
CPCE21B43/24E21B43/305
Inventor 程紫燕吴光焕石军平梁金萍蒋龙于建梅曹秋颖李伟忠唐亮李伟赵衍彬邓宏伟王传飞杨艳霞王一飞
Owner CHINA PETROLEUM & CHEM CORP