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 per

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

[0014] Dissolution test of main acid and actual core: This example combines the actual core of Bohai Oilfield to investigate the dissolution rate of different formulations of acid liquid system with polyhydrogen acid on actual core of the actual oilfield. The rock dust sampling is from Bohai Oilfield BZ34-2, the test temperature The temperature is 80°C, the reaction time is 4 hours, and the pressure condition is atmospheric pressure. Test formula (see Table 1 for test results):

[0015] 1# is composed of HCl, acidification corrosion inhibitor, iron ion stabilizer, clay stabilizer, demulsifier, drainage aid, mutual solvent and water mixture, calculated based on the amount added per 100 ml of water: HCl 8 g, acidification corrosion inhibitor Agent 1g, iron ion stabilizer 1g, clay stabilizer 2g, demulsifier 1g, drainage aid 1g, mutual solvent 2g.

[0016] 2# is composed of HCl, HF, acidification corrosion inhibitor, iron ion stabilizer, clay stabilizer, demulsifier,...

Example Embodiment

[0024] Example 2

[0025] This example is the application of the polyhydroacid acidification system with the main acid described in Example 1 in Daqing Oilfield: The well is located in the Sudeerte structure in the eastern fault stage belt of Beier Sag, Hailar Basin, and is geographically located in the new Hulun Buir League in the Inner Mongolia Autonomous Region. Within the territory of Barhu Zuoqi. The construction plan is as follows:

[0026] The polyhydroacid acidification system includes:

[0027] (1) Pre-acid: It is composed of HCl, acidification corrosion inhibitor, iron ion stabilizer, clay stabilizer, demulsifier, drainage aid, mutual solvent and water mixed, calculated based on the amount added per 100 ml of water: HCl 10 G, acidification corrosion inhibitor 1 g, iron ion stabilizer 1 g, clay stabilizer 2 g, demulsifier 1 g, drainage aid 1 g, mutual solvent 2 g;

[0028] (2) Main acid: It is composed of HCl, fluoride salt, polyhydrogen acid, acidification corrosion inhibi...

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PUM

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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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