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Plugging control method for treating steam channeling during steam huff and puff

A technology of steam and steam channeling, which is used in the field of oil recovery of oil reservoirs to achieve the effect of reducing oil-water interfacial tension, high viscosity and large flow resistance

Inactive Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a plugging and adjusting system that can effectively block steam channeling, has good high temperature resistance and little oil layer damage, can solve the problem of steam channeling in the process of steam huffing and puffing, and can control the plugging of steam huffing and puffing steam channeling to ensure the effect of thermal recovery development. tune method

Method used

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  • Plugging control method for treating steam channeling during steam huff and puff

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Effect test

Embodiment 1

[0042] Since the mining of Jin 6 Block of Jinjia Oilfield, the phenomenon of steam channeling has been serious in the first cycle of steam huffing and puffing. This method is used to control the steam channeling of Jin 6-6 well. The specific implementation steps are as follows:

[0043] Step 1: Inject 200t of steam into the steam injection well, the steam injection rate is 9t / h, and the dryness of steam injection is ≥75%. During the steam injection process, pay attention to record the steam injection pressure change, so as to adjust the steam injection parameters according to the pressure in time.

[0044] Step 2: inject plugging agent. Positive injection of high temperature composite plugging agent solution 70m 3 (composite plugging agent formula: 5.6 tons of modified tannin extract, concentration 8%, cross-linking agent 2.8 tons, concentration 4%), top extrusion water 20m 3 ; Close the well and wait for 24h.

[0045] Step 3: Inject 1600t of steam into the steam injection ...

Embodiment 2

[0048] In the second cycle of steam injection in Jin17-Ping24 well of Jin17 Block in Jinjia Oilfield, steam channeling occurred with adjacent wells. For Jin17-Ping24 well, this method is used to control steam channeling. The specific implementation steps are as follows:

[0049] This implementation provides a blockage adjustment method applied to control steam huff and puff channeling, including the following steps:

[0050] Step 1: Inject 200t of steam into the steam injection well, the steam injection rate is 9t / h, and the dryness of steam injection is ≥75%. During the steam injection process, pay attention to record the steam injection pressure change, so as to adjust the steam injection parameters according to the pressure in time.

[0051] Step 2: inject plugging agent. Positive injection of high temperature composite plugging agent solution 100m 3 (composite plugging agent formula: 8 tons of modified tannin extract, concentration 8%, 4 tons of cross-linking agent, conc...

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Abstract

The invention provides a plugging control method for treating steam channeling during steam huff and puff. The plugging control method for treating steam channeling during steam huff and puff comprises the steps that firstly, steam is injected into a steam huff and puff well in which steam channeling occurs for preheating before steam injection; secondly, a high-temperature composite plugging agent solution is positively injected into an oil tube of the steam huff and puff well in which steam channeling occurs; thirdly, clear water is used for replacement after the high-temperature composite plugging agent solution is positively injected, and the well is closed for solidification; and fourthly, steam is injected into the steam huff and puff well in which steam channeling occurs, and nitrogen and a high-temperature foaming agent are injected during the steam injection process. According to the plugging control method for treating steam channeling during steam huff and puff, a high-permeability strip-shaped zone can be effectively plugged, the situation that the steam permeates into other production wells along the high-permeability zone, and consequently the permeability of the high-permeability zone is decreased is prevented, and steam channeling is well controlled.

Description

technical field [0001] The invention relates to an oil recovery method of an oil reservoir, in particular to a blockage adjustment method for controlling steam huff and puff and channeling. Background technique [0002] Heavy oil is crude oil with high asphaltene and colloid content and high viscosity. Usually the ground density is greater than 0.943g / cm 3 Crude oil with an underground viscosity greater than 50mPa.s is called heavy oil. Due to the poor fluidity and high oil-water mobility ratio of heavy oil, it is difficult to produce it effectively by conventional mining. [0003] Steam huff and puff is to inject a certain amount of steam into the oil well, shut the well for a period of time, wait for the thermal energy of the steam to spread to the oil layer, and then open the well to produce heavy oil. Due to small well spacing, cracks, etc., steam is easy to extend through high-permeability channels. Steam escapes directly from injection wells and enters normal produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B33/13
CPCE21B43/24E21B33/13
Inventor 刘广东韩继盟李祥同徐岩光朱建军占新兵卢小娟严进容刘帅罗海涛张晓帆齐鲁明
Owner CHINA PETROLEUM & CHEM CORP
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