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Carbon dioxide composite huff-puff novel method

A carbon dioxide and new method technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of large pressure drop in oil layers, pollution blockage, poor carbon dioxide huff and puff effect, etc., and achieve safe, reliable and compatible construction good sex effect

Inactive Publication Date: 2019-01-04
DAQING JINJUN PETROLEUM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional carbon dioxide huff and puff injects a certain amount of carbon dioxide. The main principles of oil increase are: viscosity reduction and volume expansion of carbon dioxide. Pollution and blockage around the well, etc., conventional CO2 huff and puff effect is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The new carbon dioxide compound throughput method includes the following steps:

[0011] 1) Inject the prefluid before injecting carbon dioxide huff and puff: prefluid is a soluble chloride salt solution, the mass percentage concentration of the chloride salt solution is 5-30%, and the chloride ion concentration is related to the formation and the salinity of the produced water. The test shows that the concentration of 5-30% by mass of chloride ion is better. The main functions of the chloride salt are: one is to prevent the migration and swelling of clay particles; the other is due to the water deposition principle of the rock, most of the stratum is hydrophilic, and the added pre-working fluid replaces the crude oil adsorbed on the rock surface to improve the proximity to the well Saturation of the surrounding movable oil; thirdly, the added chloride salt belongs to strong acid and weak base salt, which appears weakly acidic after ionization. Combining with subsequent ca...

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Abstract

A carbon dioxide composite huff-puff novel method comprises the following steps of 1) firstly, injecting a prepad fluid before injecting carbon dioxide huffing-puffing: the prepad fluid is a soluble chlorine salt solution, the mass percentage concentration of the chlorine salt solution is 5-30%, the prepad fluid is continuously injected from a tubing-casing annulus space, the injection amount is 100-120 m3, the injection focuses on self-priming or adopts a pump injection mode, and the wellhead injection pressure does not exceed 10 MPa; 2) injecting carbon dioxide: 1-2.5 t liquid carbon dioxideneeds to be injected for each meter of effective pay thickness; 3) injecting a displacement fluid: the displacement fluid is obtained by mixing hot water and the soluble chlorine salt solution, the mass percentage concentration of chlorine salt in the displacement fluid is 2-7%, and the 10m3 displacement fluid needs to be added to each 1000 m. According to the carbon dioxide composite huff-puff novel method, by using an ion exchange effect of the carbon dioxide and the chlorine salt, the pH value around the near wellbore is effectively reduced, and a double effect of performing instant flow-back while acidizing unblocking is carried out is achieved.

Description

Technical field: [0001] The invention relates to the technical field of oil production in oil fields, and specifically belongs to a new method of carbon dioxide compound huff and puff. Background technique: [0002] Conventional carbon dioxide huff and puff injects a certain amount of carbon dioxide. The main oil increase principles are: the viscosity reduction and volume expansion of carbon dioxide. However, due to the heterogeneity of the formation, the large drop in oil layer pressure, the super-floating displacement of carbon dioxide, and the near Pollution and blockage around the well, etc., the conventional carbon dioxide throughput effect is poor. Summary of the invention: [0003] The purpose of the present invention is to provide a new method of carbon dioxide complex huff and puff. This application uses the ion exchange effect of carbon dioxide and chloride salt to effectively reduce the pH value around the well, and play the dual role of acidification and removal of blo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/22
CPCE21B43/16E21B43/164
Inventor 宫淑萍
Owner DAQING JINJUN PETROLEUM TECH DEV CO LTD