Research On Thin Oil-layer Acidizing Technology Of Xing Shu Gang Oil-field

Exploiting the thin oil-layer is important step that we should take to increase exploitable reserves and preserve steady production of Daqing oilfield. But on cause of the low permeability, weak physical characteristic, high content of clay, the layer is easily polluted in the exploitation to plug the near-well area, the representation is after the injection a lot of water-injecting wells can't make effect or injecting pressure is near to the rupture pressure.. On condition of the situation, the ratio of the production is low, and production decrease fast, injection and production make malfunction, seriously affect exploitation in the oil-field. In Xing shu gang oil-field, low permeability, weak physical characteristic, high content of clay cause serious formation damage. On research of the study of low permeability formation and damage characteristic of Xing shu gang oilfield, we acquire why the injection wells have problems of little hygroscope thickness and low hygroscope capacity. On the basis of many indoor experiments, we have summarized acidizing reformation technology of oil formation. The main results and contributions of this paper are as follows:1. By the analysis of acidizing theory, we make sure the deposition in the reaction between the acid and rocks, to provide proof for the acidizing technics research.2. we use different ways to solve different plugging styles so that to ensure the field trial.3. carry on the research of acidizing parameter design. According to the Darcy Law, we decide acidizing radius to reach max-benefit.4. accomplish 70 wells, efficiency is 85.7%, make good field trial.