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A channel sealing system and its preparation method and application

A system, volcanic rock technology, applied in chemical instruments and methods, mining fluids, earthwork drilling, etc., can solve problems such as low foam strength, achieve strong foaming ability, and improve the effect of sealing channeling.

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general foam strength is low and the temperature resistance is not suitable for high temperature and fractured volcanic rock reservoirs.

Method used

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  • A channel sealing system and its preparation method and application
  • A channel sealing system and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a channel sealing system and its application in channel sealing of gas injection wells in volcanic reservoirs.

[0040] In this embodiment, the gas flooding injection well Xiao 22-15-27 of the volcanic rock reservoir is selected as the experimental oil reservoir. The buried depth of the oil layer is 3138-3163m, and there are 3 layers with a thickness of 25m. The permeability is 35mD and the porosity is 15.4%. The original pressure is 31.5MPa, the current pressure is 25.3MPa, and the current formation temperature is 100°C.

[0041] There are 8 production wells in the Xiao 15-27 well group, and 5 wells are currently in operation (among them, Xiao 23C gas channeling is closed, Xiao 16-26 gas channeling is opened, and Xiao 14-28 and Xiao 12-28 are closed with high water cut); The gas injection pressure of the well was 10MPa before using the channeling agent of the gas injection well of the volcanic rock reservoir. Before the measures, the daily oil...

Embodiment 2

[0060] This embodiment provides a channel sealing system and its application in channel sealing of gas injection wells in volcanic reservoirs.

[0061] In this example, gas flooding injection wells in volcanic rock reservoirs are selected. The Xiao 25-12-13 well group is located in the middle of the Xiao 25 ​​block. There are 8 oil wells in total, with an oil-bearing area of ​​0.32km 2 , oil layer thickness 107.6m, porosity 11.8%, permeability 0.994×10-3μm 2 , the formation temperature is 96°C. Core observation shows that fractures and caves are well developed in volcanic rock reservoirs, with a maximum width of 2 mm, and generally about 1% of macroscopic fractures and caves.

[0062] The gas injection pressure of Xiao 25-12-13 well group was 6 MPa before using the channeling agent of gas injection wells in volcanic rock reservoirs, and the gas channeling direction was 1. 98.5%, and the underground utilization rate of injected gas is 26%.

[0063] The channel sealing system...

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Abstract

The invention provides a channelling sealing system, a preparation method and application thereof. The channelling sealing system comprises a first sub-channelling sealing system and a second sub-channelling sealing system. By weight, the first sub-channelling sealing system comprises the following raw materials: 0.05-0.35 part of Na2SO3, 0.2-0.5 part of cationic polyacrylamide, 0.1-0.5 part of polyoxyethylene ether, 0.2-1.0 part of oil sludge, 0.05-0.3 part of a phenolic resin crosslinking agent, 0.05-0.1 part of C6H4(NH2)2 and 100 parts of water; by weight, the second sub-channelling sealingsystem comprises the following raw materials: 1.0-3.0 parts of heptadecyl dimethyl betaine, 0.01-0.1 part of fatty acid diethanol amide, 0.5-1.5 parts of polyoxyethylene fatty acid amide and 100 parts of water. The channelling sealing system provided by the invention has a series of advantages of high viscosity, good temperature resistance, excellent bubble performance and the like, and can effectively realize deep plugging of volcanic rock stratum.

Description

technical field [0001] The invention relates to a channel sealing system and its preparation method and application, belonging to the technical field of oil production. Background technique [0002] Volcanic rock refers to the magma ejected from the ground by a volcanic eruption. Due to the rapid drop in temperature and pressure, chemical and physical changes have occurred, so it has become volcanic rock. Volcanic rocks are prone to fragmentation under tectonic forces, so there are a large number of secondary voids. At present, most volcanic rock reservoirs in my country are developed by water injection, but the effect is not ideal. Studies have shown that gas injection is an effective method to improve the development effect of volcanic reservoirs, but the gas can easily protrude along large fractures to form gas channeling, which leads to the loss of the effect of gas injection flooding. [0003] At present, the method of foam injection is mainly used for sealing channel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467E21B33/13E21B43/16
CPCC09K8/426C09K8/467E21B33/13E21B43/166
Inventor 王尧王浩王斯雯吴冬李瑞马昌明郑猛刘强王磊陈小凯滕立勇戴倩倩何强
Owner PETROCHINA CO LTD
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