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Gel-air foam oil displacement method

A technology of air foam and gel, which is applied in chemical instruments and methods, earth square drilling and production fluids, etc., can solve the problems of low collection rate and slow oil production speed, and achieve high collection rate, fast oil production speed and good benefits Effect

Active Publication Date: 2016-10-26
张荣斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing heavy oil foam oil flooding technology cannot show the development characteristics of "foam oil" in the production process of heavy oil reservoirs without gas, and the oil recovery rate is slow and the recovery rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A gel-air foam oil flooding method, comprising the following steps:

[0035] Step 1, using vertical wells and horizontal wells to form a displacement well pattern, and vertical wells and horizontal wells to form a 5×9 displacement well pattern;

[0036] Step 2: Inject gelling agent into the vertical well. The injection volume of the gelling agent is 60~780t, and the injection speed is 10~150t / day. During the process of injecting the gel, SiO is added along with the gel 2 Airgel core / polystyrene shell microspheres, SiO 2The particle size of the airgel core / polystyrene shell microspheres is 100~200nm, the surface of the microspheres has a concave-convex structure, and the tap density of the microspheres is 0.353g / cm 2 ;

[0037] Step 3, feed nitrogen into the vertical well and the horizontal well, into the middle of the vertical well, and into the upper part of the horizontal well, the amount of nitrogen gas introduced is 400-1200L, and the injection rate is 2-80L / min; ...

Embodiment 2

[0041] After the silane coupling agent, water glass silicon source silica airgel and ethanol (molar ratio 0.8:1:2.5) are dispersed uniformly by ultrasonic, add to the mixed solution of water, ethanol and styrene (molar ratio 1:1:1.5) In the microwave reactor, after reacting for 15~25min in the microwave reactor, azobisethylbutyronitrile (the molar ratio of water glass silicon source silicon airgel is 1.2:1) was used as the initiator, and polyvinylpyrrolidone was added into the system as the dispersant. Dispersion polymerization of styrene is carried out, and the initiator initiates the generation of inorganic ions with positive charges and negative charges on the surface of free radicals, which are fully reacted and then centrifugally dried to obtain encapsulated particles in which organic matter completely covers inorganic matter.

Embodiment 3

[0043] The gel consists of 23 parts of polyethylene glycol in parts by mass, 32 parts of lauryl ether glycoside, 8 parts of methyl propionate, 10 parts of methoxy polyethylene glycol acrylate, 27 parts of polyether polyol, 22 parts Parts of pentylene glycol polyester polyol and 37 parts of polycarboxylic acid, wherein, polyether polyol is polyether triol; pentylene glycol polyester polyol is pentylene glycol polyester diol; polycarboxylic acid is saturated Pentacarboxylic acid.

[0044] The foaming agent consists of 5 parts by mass of polyoxyethylene ether acyl ether alcohol, 10 parts of polyoxypropylene glycol, 18 parts of azodicarbonamide, 3 parts of vinyl polysiloxane and 21 parts of dedecyl trimethyl ammonium chloride composition.

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Abstract

The invention discloses a gel-air foam oil displacement method and belongs to the field of oil production. The gel-air foam oil displacement method comprises the steps that vertical wells and horizontal wells are adopted to form a displacement well net; 60-780 t of a gel is injected into the vertical wells at the speed of 10-150 t / day; 400-1200 L of nitrogen is guided into the vertical wells and the horizontal wells at the speed of 2-80 L / min; and 450-2700 t of a foam agent is injected into the horizontal wells at the speed of 90-300 t / day, and vibration foaming is conducted after injection is completed. The gel-air foam oil displacement method has the characteristics that the method can be widely applied to heavy oil reservoirs with various viscosities, burial depths and reservoir thicknesses, steam does not need to be injected into the oil reservoirs any more, and formed foam oil flow has a high flowing resistance coefficient; and the gel-air foam oil displacement method can be suitable for various steam injection type heavy oil reservoirs and heavy oil reservoirs difficult for conventional foam oil displacement, the oil production speed is high, and the collection rate is high.

Description

technical field [0001] The invention relates to an oil flooding method, in particular to a gel-air foam oil flooding method. Background technique [0002] my country's heavy oil reservoirs are widely distributed in oilfields such as Xinjiang, Liaohe, and Shengli. The main mining technology is steam injection thermal mining technology. According to incomplete statistics, 70% of the proven reserves have been commercially developed. However, there are still some hard-to-recover heavy oil reserves. Due to their special reservoir conditions, the current conventional steam injection production technology is difficult to be effectively produced. [0003] Heavy oil foam oil flooding technology, in the process of solution gas flooding in heavy oil reservoirs, due to the high concentration of crude oil, slow gas diffusion speed, and large pressure gradient, the precipitated gas is not produced rapidly in the continuous gas phase, but in a small Bubbles are dispersed in the crude oil ...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/584C09K8/588
CPCC09K8/584C09K8/588E21B43/16
Inventor 张荣斌
Owner 张荣斌
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