This paper analyzes that the main reason of low injectivity of water injection wells is that the Sr 2+ in formation water reacts with the SO 4 2- in the Yellow River water to produce precipitate of BaSO 4 when the Yellow River water mixes with formation water.

該文分析了勝坨油田注水井吸水能力降低的主要原因是黃河水與地層污水混注時，地層水中的Sr2＋孕妇国产精品免费视频、Ba2＋與黃河水中的SO2－4反應生成BaSO4国免费自拍视频、SrSO4沉淀。

Aimed at current situation of our country oil-gas field exploitation, and based on the damage mechanism knowledgement and research of reservoir permeability in the course of produced water reinjection, and its effects for the injectivity of water-injection well, The paper makes the theory and experiment study for the injectivity damage of the water-injection well caused by suspended solid particals in reinjection water and water-oil mobility discrepancy.

本文針對我國水驅(qū)油田開發(fā)現(xiàn)狀欧美日韩网址在线看片免费播放，在深入認識和研究產(chǎn)出水回注對地層滲透能力損害機理及其對注水井注入能力影響的基礎上大乳女子自慰喷潮，對由回注水中固相懸浮顆粒及水油流度差異造成的注水井注入能力損害進行了理論和實驗研究。

As a whole,the notable characteristic of primary productivity in size-fractioned structure was that nanoplankton occupied comparatively significant advantage in Beibu Gulf.Nanoplankton has the largest contribution to gross primary productivity,and picoplankton was the secondary contributor,while microplankton the least.The contribution of microplankton for primary productivity in the north Gulf was more than that in the other waters.Nanoplankton and picoplankton contribute more to the gross primary productivity in offshore deep waters than in inshore shallow waters3.The Beibu Gulf can be divided into three ecoregions:Region-Ⅰis the ecoregion in inshore shallow waters of the north Gulf.In average,the water depth is 18m,DIN is 1.88μmol/L,DIP is 0.20μmol/L,N:P is 9.4:1,dissolved silicate is 5.17μmol/L,the Chl a conentration in surface layer is 2.27mg·m~(-3),the assimilation index in surface layer is 3.80mg/,the primary productivity is 198.78mgC/(m~2·d), and potential fishery production is estimated to be 0.24gC/(m~2·a) according to the primary productivity.The ecoregion is mainly affected by the northern coastal water systems,and may be fit for aquaculture;Region-Ⅱis the ecoregion in offshore deep waters of the north Gulf and the coastal shallow waters to the west Hainan Island.In average,the water depth is 35m,DIN is 2.01μmol/L,DIP is 0.18μmol/L,N:P is 11.2:1,disovled silicate is 4.23μmol/L,the chlorophyll a of surface layer concentration is 1.45mg·m~(-3),the assimilation index of surface layer is 4.12 mg/,the primary productivity is 276.60mgC/(m~2·d),and the estimated potential fishery production is 0.34gC/(m~2·a) according to the primary productivity. The ecoregion was mainly influenced by ocean current from the South China Sea, rivers in the west coast of Hainan Island and the water from Qiongzhou Strait.It may be fit for aquaculture and fishery;Region-Ⅲis the ecoregion in offshore deep waters of the mid and south Gulf.In average,the water depth is 75m,DIN is 0.77μmol/L, DIP is 0.15μmol/L,N:P is 5.1:1,disovled silicate is 3.05μmol/L,the chlorophyll a of surface layer concentration is 0.70mg·m~(-3),the assimilation index of surface layer averaged is 3.69mg/,the primary productivity is 350.89mgC/(m~2·d),and the estimated potential fishery production is 0.43gC/(m~2·a) according to the primary productivity.The ecoregion was mainly affected by the circulation inside Beibu Gulf, and may be fit for fishery.

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Selective water shut off action of water shutoff agent, effect of permeability on injection pressure, movability of water shutoff agent are researched, and multi-block design of water shutoff agent, particles diameter selection of water shutoff agent are performed.

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The effects of NaAA content on the mechanical properties and water-swellable properties were studied. The experimental results show that NaAA has good reinforcement for the EVM vulcanizate. EVM vulcanziate reinforced by NaAA has higher water absorbing rate and equilibrium water absorbing ratio. When the NaAA content is 50 phr, the maximum water-absorbing ratio of EVM vulcanziate is 278.3%. With the incorporation of ion into immersing media, the water-absorption ratio of EVM vulcanizates decreases. FT-IR analysis confirms that NaAA formed in the process of compounding and underwent polymerization during vulcanization.

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Gross of natural resources of water of catchment of the Yangtse River 996 billion stere, 35% what take the throughout the country, at present development utilization rate has 18% only, divide outside propping up this catchment to use water, still pass in carrying out south project of water north attune is northwardly provide fresh water resource, its moist limits involves 26 provinces city, shortage of gross of this pair of water, and distributing very not all China has fundamental strategic value.

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Based on water-entry dynamic and water-entry ballistic theories,the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena,and an oblique water-entry impact model coupled with ballistic and dynamic models are established.

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Based on water-entry dynamic and water-entry ballistic theories, the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena, and an oblique water-entry impact model coupled with ballistic and dynamic models are established. According to the exact geometric shape of the wetted body surface, the dynamic model is established.

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So we should try to improve the usage rate of water by saving water,control the overdevelop of underground water,make full use of ground water,fa-ther and reuse waste and polluted water.

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