A drilling-mud additive used to control fluid loss in water muds ranging from freshwater to saturated-salt to high-pH lime muds. Starches have thermal stability to about 250°F [121°C]. They are subject to bacterial attack unless protected by high salinity or bactericide. Drilling-grade natural starch has API/ISO specifications for quality. Starches are carbohydrates of a general formula (C6H10O5)n and are derived from corn, wheat, oats, rice, potatoes, yucca and similar plants and vegetables. They consist of about 27% linear polymer (amylose) and about 73% branched polymer (amylopectin). The two polymers are intertwined within starch granules. Granules are insoluble in cold water, but soaking in hot water or under steam pressure ruptures their covering and the polymers hydrate into a colloidal suspension. This product is a pregelatinized starch and has been used in muds for many years. Amylose and amylopectin are nonionic polymers that do not interact with electrolytes. Derivatized starches, such as hydroxypropyl and carboxymethyl starches, are used in drill-in fluids, completion fluids and various brine systems as well as in drilling-mud systems. The use of starch typically causes a minimal increase in viscosity while effectively controlling fluid loss.

鉆井液添加劑一種鉆井液添加劑，用于控制淡水、飽和鹽和高ph石灰泥漿中液體的流失淀粉熱穩(wěn)定到250°F(121°C)。除非受到高鹽度或殺菌劑的保護(hù)，否則它們會(huì)受到細(xì)菌的攻擊。鉆孔級(jí)天然淀粉具有API/ISO質(zhì)量標(biāo)準(zhǔn)。淀粉是一種通用公式(C6H10O5)n的碳水化合物，來(lái)自玉米、小麥、燕麥、大米、土豆、絲蘭和類似的植物和蔬菜。它們由27%的直鏈聚合物(直鏈直鏈淀粉)和73%的支鏈聚合物(支鏈淀粉)組成。這兩種聚合物在淀粉顆粒中纏繞在一起。顆粒不溶于冷水，但浸泡在熱水或蒸汽壓力下會(huì)使其覆蓋層破裂，聚合物水化形成膠體懸浮液。本產(chǎn)品是一種預(yù)糊化淀粉，已用于泥漿多年。直鏈淀粉和支鏈淀粉是非離子聚合物，不與電解質(zhì)相互作用。衍生淀粉，如羥丙基和羧甲基淀粉，用于鉆井液、完井液和各種鹽水系統(tǒng)以及鉆井泥漿系統(tǒng)。淀粉的使用通常導(dǎo)致粘度的最小增加，同時(shí)有效地控制了液體的損失。

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