问题 问答题 简答题

酸化增产原理

答案

参考答案:

(1)酸洗:清除井筒中的酸溶性结垢或疏通射孔孔眼的工艺。它是将少量酸液定点注入预定井段,溶解井壁结垢物或射孔眼堵塞物。

(2)基质酸化:是在低于地层破裂压力条件下将配方酸液注入储层孔隙。酸液大体径向流入储层,溶解孔隙空间内的颗粒及堵塞物,扩大孔隙空间。

(3)酸压增产:指在高于储层破裂压力或天然裂缝的闭合压力下,将酸液挤入储层,在储层中形成裂缝,同时酸液与裂缝壁面岩石发生反应,最终形成具有一定几何尺寸和导流能力的人工裂缝。

阅读理解

People believe that climbing can do good to health. Where can you learn the skill of climbing then? If you think that you have to go to the mountains to learn how to climb, you’re wrong. Many Americans are learning to climb in city gyms(体育馆). Here, people are learning on climbing. The climbing wall goes straight up and small holding places for hands and feet.

How do people climb the wall? To climb, you need special shoes and (保护带) around your chest to hold you. There are ropes(绳索)tied to your. The ropes hold you in place so that you don’t fall. A beginner’s wall is usually about 15 feet high, and you climb straight up. There are small pieces of metal that stick out for you to stand on and hold on to. Sometimes it’s easy to see the new piece of metal. Sometimes, it’s not. The most difficult is your fear. It’s normal for humans to be afraid of falling, so it’s difficult not to feel fear. But when you move away from the wall, and the ropes hold you, and you begin to feel safe. You move slowly until you reach the top.

Climbing attracts people because it’s good exercise for almost everyone. You use your whole body, especially your arms and legs. This sport gives your body a complete workout. When you climb, both your mind and your body can become stronger.

小题1:What can we infer from the passage?

A.People are fairly interested in climbing nowadays.

B.It is impossible to build up one’s body by climbing.

C.People can only learn the skill of climbing outdoors.

D.It is always easy to see holding places in climbing.小题2:The most difficult thing to do in wall climbing is _______.

A.to tie ropes to your

B.to control your fear

C.to move away from the wall

D.to climb straight up小题3:The word “workout” underlined in the last paragraph most probably means _________.

A.settlement

B.exercise

C.excitement

D.tiredness小题4:Why does the author write this passage?

A.To tell people where to find gyms.

B.To prove the basic need for climbing

C.To encourage people to climb mountains.

D.introduce the sport of wall climbing

单项选择题