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Method for redevelopment of junked drowned oil field

A redevelopment and oilfield technology, applied in the field of using chemicals to increase oil well production, can solve problems such as resuming oil production in oilfields

Inactive Publication Date: 2005-09-07
胡振起
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing profile control and water shutoff technology cannot fundamentally prevent the oilfield from being eventually scrapped due to water flooding, let alone solve the problem of restoring oil production in the oilfield that was scrapped due to water flooding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The redevelopment of oilfields abandoned due to flooding includes the following steps:

[0018] 1. Treat each original water injection well of the oilfield one by one through the water layer.

[0019] Using water and acrylic resin to add the gelled product produced by adding a basic catalyst as a gelled water blocking agent to implement the treatment measures is to squeeze acrylic resin into the water-permeable layer that accounts for 1 / 3 of the thickness of the oil reservoir from the water injection well. The design radius of the acrylate injection is 3-4 meters (m). The acrylic resin is used as a suspension with water, and the amount of water is 30-60 times that of the acrylic resin. It is blended on the well and squeezed into the well together. Then squeeze in the alkaline catalyst, so that the water and acrylate under the action of the alkaline catalyst, the gelled product produced by the acrylate absorbing 15 times its own volume of water will partially block the ...

Embodiment 2

[0039] Another construction scheme for redevelopment of oilfields abandoned due to flooding includes the following steps:

[0040] (1). Treat each original water injection well of the oilfield one by one at the water level.

[0041] The measures to implement the treatment are: use the gelled compound produced by adding ammonia to water and acrylate as the gelled water blocking agent, and partially block the water-passing layer of the water injection well. During the operation, the acrylic resin is extruded from the water injection well to the water-permeable layer that accounts for 1 / 3 of the reservoir thickness. Generally, the design radius of the acrylic resin extruded is 3-4 meters (m). The acrylic resin is made into a suspension with 30-60 times of water, blended on the well and squeezed into the well together. Then squeeze in ammonia water with a concentration of 30%, so that the gelled product produced by water and acrylic resin under the action of ammonia water will part...

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Abstract

The invention relates to a method to explore the oil field that has been rejected by flood. It includes the following steps: applying part gelate water shut off to the original water injection well, and forcing the water flowing along the portrait direction and the radial direction; applying gelate water shut off to the water flooded layer of the original production well; taking large cubic capacity pumping draining to the original production well until emptying the seeper; injecting high pressure intensified water into the original flooded oil well and the quantity is 3-5 times of the normal injecting rate; adopting pumping method to the oil field that can not flow; adjusting the output proportion and the speed to realize producing steadily.

Description

technical field [0001] The present invention relates to a method of extracting oil from a well, and more particularly to a method of using chemicals to increase the production of an oil well. technical background [0002] In the long-term practice of oil recovery, the use of water-washed oil is a powerful technical measure for improving the oil recovery and production of oil wells. With the advancement of water washing oil technology, profile control and water shutoff technology has been developed. Profile control and water plugging is to block the high permeability layer of the water injection well, that is, the water-passing layer with a radius of 1 / 2 well spacing, use the plugging agent to push 3-4 meters away from the well wall, and replace it with other non-water-passing layers Inject water. The plugging agents used for profile control and water plugging include: chromium jelly plugging agent formed by cross-linking polyacrylamide with sodium dichromate and sodium sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138E21B43/20
Inventor 胡振起
Owner 胡振起
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