问题 问答题 简答题

钢粒钻进操作注意事项有哪些?

答案

参考答案:

a、每次提钻后,都应查看钻头磨损变化情况和岩心情况,以判断参数的合理性;

b、粗径钻具上必须带取粉管,孔内岩粉若超过0.3米时,应专门进行捞取,保持孔底清洁;

c、钻进中要合理提动钻具,在钻速降低和孔内发生异常情况时,尤其要注意提动钻具;

d、在岩石可钻性相同的情况下,各班的钻进参数应一致,尤其是投砂量要统一;

e、换径钻进、合金钻进改钢粒钻进或下套管后改钢粒钻进时,应着重预防夹钻事故。一般采用小规程、小投砂量,并尽可能选用旧钻头,小规程钻进长度超过粗径钻具长度后,方可采用正常规程钻进;

f、在软硬互层中钻进时,应灵活掌握轴心压力,以免造成钻孔弯曲;

g、应经常检查钻头和钢粒质量、钻具及接头的磨损情况,不合要求的要及时更换,以保证最优钻进参数的实施,以防发生钻具折断或脱落事故;

h、尽量使用壁厚6毫米以上、长而直的粗径钻具;

i、在易斜地层中钻进,应适当减少投砂量或采用孔底局部反循环钻进法;

j、使用孔底局部反循环钻进时,钻具下到距孔底0.5~1.0米时,要找好泵量,待泵量正常后,才可慢扫到底,严禁将钻具一下到底。

填空题
阅读理解

阅读理解

      It is often difficult for visitors to understand Americans lack of desire for privacy(隐私) . They are

not a nation of walled gardens and closed gates. Their yards normally run into one another without fences,

they often visit one another's homes without being invited or telephoning first, they leave their office doors

open while they work.

      Their lack of desire for privacy probable results from their history as a nation. America is a big

country.   There have never been walled cities in the United States, nor was there the need for Americans

to protect themselves from neighboring states. During the early years, America had so few settlers that

neighbors were very important, they were not to be shut out by doors and fences. Neighbors offered

protection and helped in the hard work of settling the land. They depended upon each other.

      From the nation's early history has come the desire for openness rather than privacy. Visitors will

notice this desire in a number of small ways, there may be rooms in American homes that do not have

doors or that have glass walls. If you notice that people forget to close your door when they leave your

room, do not think that this is rude, help them to learn that you would like it to be closed, or else become

used to new ways. In either case, be patient with the differences.

1. According to the passage, visitors to America sometimes have difficulty understanding ___.

A. Americans' openness

B. American's lack of desire for privacy

C. Americans' way of home

D. American's style of life

2. During the early years, people were never shut out by doors because ___ .

A. they were neighbors

B. they were friends

C. they depended on each other

D. they got used to that

3. Visitors will notice American's desire for openness in a way ___

A. they walled their houses with glass

B. they leave the office doors open while working

C. they never have fence

D. they depended upon each other

4. Which of the following is the best title for the passage?

A. No Walled Cities.

B. The Early Settlers

C. Americans' Lack of Desire for Privacy

D. be Patient with Differences