Water block removal agent and preparation method thereof

A technology for dehydrating water lock agent and active agent, which is applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve the problems of high development cost, low oil reservoir production efficiency, and single well productivity decline.

Active Publication Date: 2017-09-08
成都百联油田技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the existing low-permeability reservoirs, which are difficult to restore reservoir permeability due to water lock damage, single-well productivity decline, low reservoir production efficiency, and high development costs, it is urgent to provide a method that can effectively relieve low-permeability reservoir water. Water-removing agent for locking effect

Method used

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  • Water block removal agent and preparation method thereof
  • Water block removal agent and preparation method thereof
  • Water block removal agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1 A schematic diagram of a preferred implementation of the injection device 100 of this embodiment is shown. Such as figure 1 As shown, the injection device 100 at least includes a storage unit 101 , an injection unit 102 and a control unit 104 . The storage unit 101 is used for classifying and storing various components of the dehydrating agent. Preferably, the storage unit 101 at least includes a water storage chamber, a first modified nano-silica storage chamber, a second modified nano-silica storage chamber and an ethylene glycol storage chamber. The storage unit 101 injects the first modified nano-silicon dioxide, the second modified nano-silicon dioxide, ethylene glycol and water stored in separate chambers into the injection unit 102 in a pressurized manner through at least one injection pipeline. The injection unit 102 coupled to the wellhead 103 includes at least a main channel 109 and at least one input hole. Each input hole is provided with at leas...

Embodiment 2

[0047] This embodiment is a further improvement on the basis of Embodiment 1, and only the improved part will be described.

[0048] Wetting reversal refers to the phenomenon that the wettability of rock changes due to the adsorption of surfactants. The wettability of a liquid to a solid is sometimes altered by the addition of a third substance. Both the hydrophilicity and lipophilicity of a solid surface can be transformed under certain conditions, so the mutual transformation of the hydrophilicity and lipophilicity of a solid surface is called wetting inversion.

[0049] The lipopeptide biosurfactant used in this example is a purchased industrial grade product. Preferably, one or more lipopeptides are contained in the lipopeptide biosurfactant, and the molecular formula of the lipopeptide is C 51 h 89 o 13 N 7 、C 52 h 91 o 13 N 7 and / or C 53 h 93 o 13 N 7 . Preferably, lipopeptides of other molecular formulas may also be contained in the lipopeptide biosurfacta...

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Abstract

The invention relates to a water block removal agent and a preparation method thereof. The water block removal agent at least comprises the following components in percentages by mass: 0.1-0.5% of first modified nano silicon dioxide modified by a lipopeptid biological surfactant, 0.5-1.0% of second modified nano silicon dioxide modified by a fluorocarbon surfactant, 10-30% of ethylene glycol and the balance of water, wherein the first modified nano silicon dioxide, the second modified nano silicon dioxide, ethylene glycol and water are injected in proportion through injection equipment of the water block removal agent and the components are mixed in the injection equipment to form the water block removal agent. The water block removal agent provided by the invention has the advantages of being convenient to prepare, strong in surface activity, high-temperature-resistant, high-salt-resistant, strong in rock absorption, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of low-permeability oil and gas reservoir development, in particular to a water-dissolving and locking agent and a preparation method thereof. Background technique [0002] During drilling, well completion, workover and production operations, foreign phases are often trapped in porous media. Another immiscible phase infiltrates into the reservoir, or the saturation of the original immiscible phase in the porous medium increases, which will damage the relative permeability, so that both the reservoir permeability and the relative permeability of oil and gas are significantly reduced. When the immiscible phase is aqueous, this phenomenon is called water lock-in. The water-locking effect will produce water-locking damage, that is, the damage caused by water immersion into the oil layer during oil well operation. Water immersion will increase the water saturation near the wellbore, increase the capillary resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60E21B43/22
Inventor 白德旭李绍和曾义勇刘丹张林刘利丘家友
Owner 成都百联油田技术服务有限公司
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