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Method for acid stimulation after carbon dioxide huffing-puffing

A technology of carbon dioxide and post-acidification, which is applied in the direction of chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of ineffective increase in production, uneven inhalation of carbon dioxide, and ineffective use of carbon dioxide, etc., so as to improve the success rate, The effect of increasing single well oil production

Inactive Publication Date: 2015-03-25
DAQING JINJUN PETROLEUM TECH DEV CO LTD
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  • Abstract
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Problems solved by technology

However, during the field test, due to differences in physical properties between layers, different pressures between layers, skin interference, etc., the injected carbon dioxide cannot be evenly inhaled, so the injected carbon dioxide cannot be effectively used, and the effect of increasing production is not obvious

Method used

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with embodiment:

[0009] The acidification after carbon dioxide huff and puff is now carried out on the Bei28 oil well. The acidification stimulation method after carbon dioxide huff and puff includes the following steps: (1) After the surface device is connected securely, conduct a pressure test at 30 MPa. It is required to hold the pressure for 25 minutes without puncture or leak. After each pressure test, it must be emptied, and the pressure is required to return to zero; (2) Inject 50m of composite foam acid solution 3 ; (3) Large displacement test injection, adopt the method of gradually increasing the displacement; if the injection pressure rises rapidly, stop the pump under the burst pressure, slowly vent, and start continuous injection after the pressure returns to normal. After the foam acid liquid is injected, the replacement fluid is injected; (4) After the construction is completed, the we...

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Abstract

The invention provides a method for acid stimulation after carbon dioxide huffing-puffing. The method for acid stimulation after carbon dioxide huffing-puffing comprises the following steps that (1), after a ground device is connected safely, pressure testing of 30 MPa is carried out, it is required that pressure is kept down for 25 min, stabbing and leakage are avoided, pressure testing is carried out three times continuously, evacuation is needed every time pressure testing is finished, and pressure is required to be zero; (2), composite foam acid of 30-50 m<3> is injected; (3), large-displacement injection testing is carried out, the displacement gradual rising method is adopted, and displacement fluid is injected after the foam acid is injected. The method prevents the gar block-up effect from being generated at the immediate vicinity of a wellbore, improves the success rate of measures and increases the oil production of a single well.

Description

Technical field: [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a method for increasing production by acidification after carbon dioxide huff and puff. Background technique: [0002] Carbon dioxide huff and puff means that after a certain amount of carbon dioxide is injected into the formation from the oil casing annulus of the oil well, after a period of well soaking, the carbon dioxide fully diffuses into the oil layer, reducing the viscosity of crude oil and expanding its volume, making crude oil easy to recover. However, during the field test, due to differences in physical properties between layers, different pressures between layers, and skin interference, the injected carbon dioxide cannot be evenly inhaled, so the injected carbon dioxide cannot be effectively used, and the production increase effect is not obvious. Invention content: [0003] In order to solve the technical problems raised by the background techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/27C09K8/58
CPCE21B43/16C09K8/584C09K8/74C09K2208/12C09K2208/32E21B43/164E21B43/26
Inventor 赵金树
Owner DAQING JINJUN PETROLEUM TECH DEV CO LTD
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