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Acidifying unblocking liquid for unblocking stratum of water injection well

A technology for water injection wells and formations, applied to drilling equipment, etc., can solve the problems of high effective concentration of nitric acid, low cost, slow corrosion of oil pipes, etc., achieve high effective concentration of nitric acid, excellent corrosion inhibition performance, and ensure construction safety.

Inactive Publication Date: 2004-04-14
计万军
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing powder nitric acid acidification fluid that corrodes oil pipes quickly, the effective concentration of nitric acid is low, it is not easy to prepare, and the cost is high, the present invention provides an acidification and plugging removal fluid for plugging and water injection well formations. Acidification plugging removal fluid can completely unblock the near-wellbore area of ​​the water injection well, and has the characteristics of slow corrosion of tubing, high effective concentration of nitric acid, easy preparation, and low cost

Method used

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  • Acidifying unblocking liquid for unblocking stratum of water injection well
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Examples

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Embodiment 1

[0025] Example 1. Well Pu 66-79 is a water injection well of the No. 7 Oil Production Plant of Daqing Oilfield Company. Under the water injection pressure of 15.5MPa, Pu 17 2 The water absorption of the layer is 1 meter 3 / day, less than 10 meters 3 / Day's allotment requirements to decide on Luso 17 2 The nitric acid acidification technology is used to remove the blockage and increase the injection in the layer and below layers, and the nitric acid acidification solution prepared in the scheme 1 in the above table 3 is used, and the nitric acid acidification solution is squeezed into 6 meters 3 , and then squeezed into 12 meters of soil acid acidification solution composed of 13.5% HCL+1.5% HF+ additives 3 . After acidification, under the water injection pressure of 13.7Mpa, Pu 17 2 The water absorption of the layer is 13 meters 3 / day, up to 10 meters 3 / day dispensing required, valid for up to 8 months.

Embodiment 2

[0026] Example 2. Well Pu 10-6-G56 is a water injection well of the No. 7 Oil Production Plant of Daqing Oilfield Company. The wellhead pressure is 13.5Mpa. Well Pu 10-6-G56 has two water injection layers in total. Before acidification, the Pu 17-8 layer The water absorption capacity is 3 meters 3 / day, the water absorption of Pu 110 layer is 18 meters 3 / day, the total water absorption is 21 meters 3 / day, 50 meters away from the distribution requirements 3 / day is still 27 meters short 3 / day, use the nitric acid acidizing fluid prepared in the scheme 2 in the above table 3 to carry out acidizing, plugging removal and increasing injection for the whole well, and squeeze into the nitric acid acidizing fluid for 18 meters 3 , and then squeezed into 17 meters of soil acid acidification solution composed of 13.5% HCL+1.5% HF+ additives 3 , under the water injection pressure of 12.7MPa, the water absorption of Pu 17-8 layer is 25 meters 3 / day, the water absorption of Pu ...

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Abstract

The composition of the invented acidization blocking remover liquor comprises (wt%) 3%-20% of industrial nitric acid, 0.8%-1.2% of nitric acid acidization additive and the rest is water, and the nitric acid acidization additive is formed from metal corrosion inhibitor and surfactant. Said invention can completely eliminate the near-well-bore area block of wall injection well, and has the characteristics of slow oil pipe corrosion speed, high nitric acid effective concentration, easy preparation and low cost.

Description

Technical field: [0001] The invention relates to an oilfield chemical agent used in the technical field of chemical plugging removal for oil and water wells in oil fields, and belongs to the acidification plugging removal fluid for plugging water injection well formations. Background technique: [0002] In the process of crude oil exploitation, the strata near the wellbore of the water injection well are polluted and clogged, and the water injection pressure is high. Commonly used are earth acid acidizing liquid or hydrochloric acid acidizing liquid. When earth acid acidizing liquid or hydrochloric acid acidizing liquid is used for operation, the effect of penetrating and dissolving blockages is poor, and the effective period of acidizing is short, and the scale of acid liquid used in repeated acidizing must be larger than The large scale of the previous operation was effective, mainly because the acid solution was consumed quickly and the residual liquid after reacting with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 计万军
Owner 计万军
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