Low-filtration-loss blockage relieving fluid for acidification oilfield well and preparation method thereof

A technology for oilfield wells and fluid loss, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low illite content, low porosity and permeability, and difficulty in removing blockages in the Yanchang Formation oil layer, and achieves the Good adaptability and technical promotion value, strong active penetration ability, and the effect of reducing secondary damage
CN108559481AInactive Publication Date: 2018-09-21兰州凯宏中原石油科技有限公司
4 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
兰州凯宏中原石油科技有限公司
Publication Date
2018-09-21
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention discloses low-filtration-loss blockage relieving fluid for acidification oilfield well. The blockage relieving fluid is prepared from the following raw materials in parts by weight: 20-40 parts of organic acid, 110-130 parts of composite acid body, 2-4 parts of corrosion inhibitor, 30-40 parts of micellar acid stabilizer solution, 1-2 parts of surfactant and 1-3 parts of sodium tripolyphosphate. The reaction speed of the blockage relieving fluid with quartz and feldspar minerals is higher than that of the blockage relieving fluid with clay minerals, so that acid liquid not only can eliminate the formation pollution, but also can well improve the original permeability of the formation; the acid liquor system has good adaptability with the formation, and secondary precipitatedacid slag is not produced in a formation treatment process, so that new pollution is not caused.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of plugging-removing fluids, and in particular relates to a plugging-removing fluid for low fluid loss acidification oil field wells and a preparation method thereof. Background technique

[0002] Acidizing is one of the most effective production stimulation measures in the process of oilfield development and production. Its purpose is to remove acid-soluble blockages near the wellbore and in the pores of the oil layer, expand the circulation channels of the oil layer, and improve the permeability of the oil layer. However, due to the characteristics of rock structure and the existence of acid-sensitive minerals, if the choice of acid solution or process method is unreasonable, it will also cause damage to the formation, which is called acid-sensitive damage.

[0003] The clay mineral assemblage in the oil layers of the Yanchang Formation is very simple, with chlorite as the absolute dominant, and the cement is mainly...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More