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Gas injection method in thermal recovery process

A thermal recovery and nitrogen technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., which can solve the problems of multiple operations and short effective period.

Active Publication Date: 2020-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These technologies have improved the effect of steam injection development to a certain extent, but there are still problems such as short effective period and the need for multiple operations, so it is necessary to change the injection method

Method used

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  • Gas injection method in thermal recovery process
  • Gas injection method in thermal recovery process
  • Gas injection method in thermal recovery process

Examples

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application example 1

[0054] In order to facilitate the understanding of the solutions and effects of the embodiments of the present invention, a specific application example is given below. Those skilled in the art will understand that this example is only for the purpose of facilitating the understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0055] Taking two horizontal wells as an example, the well spacing is 100 meters, the horizontal section length is 100 meters, the reservoir thickness is 15 meters, the porosity is 35%, and the viscosity of crude oil under formation conditions is 52000mPa.s.

[0056] Step 1: A total of 1 well group, including well 1 and well 2. Among them, the gas injection time is 40-80 days, the brine time is 20-40 days, and the oil production time is 60-120 days.

[0057] Step 2: Inject steam into the well group, specifically: Step 201: Well 1 conducts steam injection operation for 60 days,...

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Abstract

The invention discloses a gas injection method in a thermal recovery process. The method comprises the following steps that step one, a plurality of well groups are divided according to the total wellnumber; step two, steam injection is simultaneously carried out on all the well groups; step three, nitrogen injection is conducted on all the well groups at the same time; step four, carbon dioxideinjection is simultaneously conducted on all the well groups; step five, thermal recovery profile control system injection is conducted on all the well groups at the same time; and step six, the stepstwo to five are repeated until the oil-steam ratio is lower than a set threshold value. By combining the action mechanisms of multiple injection media and the synergistic effect of huff and puff anddisplacement, a good effect of steam injection for thick oil development is achieved.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a gas injection method in a thermal recovery process. Background technique [0002] Injecting steam into heavy oil reservoirs to heat the reservoir and reduce the viscosity of crude oil has become one of the main methods for enhanced recovery of heavy oil. Steam injection methods include steam stimulation and steam flooding. Steam huff and puff refers to the technology of injecting steam into a single well, soaking the well and recovering oil. Its main advantages are simple construction, quick return, low risk, and strong applicability. Create conditions such as plugging removal, thermal communication and reduction of formation pressure. Its main limitation is that the range of action is small, and it is a process of increasing temperature and reducing pressure, and the recovery factor is generally less than 20%. After multi-cycle steam stimulation, as the number o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/16E21B43/22
CPCE21B43/24E21B43/168E21B43/164
Inventor 王海涛何应付骆铭伦增珉吕成远赵清民赵淑霞赵春鹏郎东江周霞
Owner CHINA PETROLEUM & CHEM CORP
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