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Main acid for oil well drilling and multi-hydrogen acid acidulating system with main acid

A technology of polyhydrogen acid and main acid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced oil yield, low oil well permeability, blockage, etc., and can solve the problems of sediment blockage and low permeability Effect

Active Publication Date: 2011-01-26
北京奥凯立科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For this reason, the technical problem to be solved by the present invention is to provide a kind of main acid that can be applied to oil wells with low permeability, low oil yield, and no oil production, so as to effectively solve the problem of sedimentation and plugging; Acidic polyhydric acid acidification system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The dissolution test of the main acid and the actual core: In this example, combined with the actual core of the Bohai Oilfield, the dissolution rate of the different formulations of the acid liquid system with polyhydric acid on the actual oilfield core was investigated. The rock powder was sampled from BZ34-2 in the Bohai Oilfield. The temperature was 80° C., the reaction time was 4 hours, and the pressure condition was atmospheric pressure. Test formula (test results are shown in Table 1):

[0015] 1# is composed of HCl, acidifying corrosion inhibitor, iron ion stabilizer, clay stabilizer, demulsifier, drainage aid, mutual solvent and water, calculated on the basis of the amount added per 100 ml of water: 8 grams of HCl, acidizing corrosion inhibitor 1 gram of agent, 1 gram of iron ion stabilizer, 2 grams of clay stabilizer, 1 gram of demulsifier, 1 gram of drainage aid, and 2 grams of mutual solvent.

[0016] 2# is composed of HCl, HF, acidifying corrosion inhibito...

Embodiment 2

[0025] This example is the application of the polyhydric acid acidification system with the main acid described in Example 1 in Daqing Oilfield: the well is located in the Sudert structure in the eastern fault zone of the Beier Sag in the Hailaer Basin, and its geographical location is located in the new Hulunbuir League, Inner Mongolia Autonomous Region. Within the territory of Balhu Left Banner. The construction plan is as follows:

[0026] The polyhydric acid acidification system includes:

[0027] (1) Pre-acid: It is composed of HCl, acidifying corrosion inhibitor, iron ion stabilizer, clay stabilizer, demulsifier, drainage aid, mutual solvent and water, calculated by the amount added per 100 ml of water: HCl 10 gram, 1 gram of acidifying corrosion inhibitor, 1 gram of iron ion stabilizer, 2 grams of clay stabilizer, 1 gram of demulsifier, 1 gram of drainage aid, 2 grams of mutual solvent;

[0028] (2) Main acid: It is composed of HCl, fluorine salt, polyhydric acid, aci...

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Abstract

The invention relates to a main acid for oil well drilling and a multi-hydrogen acid acidulating system with the main acid. A multi-hydrogen acid is prepared by blending HCl, villiaumite, multi-hydrogen acid, an acidization corrosion inhibitor, a ferric ion stabilizer, a clay stabilizer, a demulsifier, a discharge aiding agent and water. Based on 100mg of water, the multi-hydrogen acid comprises 8 to 15g of HCl, 2 to 4g of villiaumite, 3 to 6g of multi-hydrogen acid, 1 to 3g of acidization corrosion inhibitor, 0.5 to 2g of ferric ion stabilizer, 1 to 2g of clay stabilizer, 0.5 to 1g of demulsifier, 0.5 to 1g of discharge aiding agent and 1 to 2g of mutual solvent, wherein the multi-hydrogen acid acidulating system comprises a front acid, the main acid and a back acid. The main acid and the multi-hydrogen acid acidulating system which contains the main acid is applicable for oil wells with the disadvantages of low oil well permeability, low oil recovery, no oil and the like and can effectively solve the problem of blockage caused by sedimentation.

Description

technical field [0001] The invention relates to a set of acidizing fluid system for acidizing fracturing engineering, in particular to a main acid suitable for oil wells with low permeability, reduced oil yield, and no oil production, and a multi-purpose acid with the main acid Hydrogen acid acidification system. Background technique [0002] Since the advent of plugging removal technology using a mixture of hydrochloric acid and hydrofluoric acid (i.e. earth acid) in sandstone reservoirs, the acidizing technology for sandstone reservoirs has been widely used and developed in the production of oil and gas fields in various countries around the world. And in continuous exploration and practice, many new acid liquid systems and acidizing technologies applied to sandstone reservoirs have also come out one after another. The acid used for acidizing sandstone reservoirs has developed from the initial clay acid liquid system to today's retarded acid, organic acid, authigenic acid...

Claims

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Application Information

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IPC IPC(8): C09K8/78
Inventor 王铁林顾新波周文欣董海军
Owner 北京奥凯立科技发展股份有限公司
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