[百年油田]

大庆日报讯（实习记者 张然）想要预知人体冠状动脉病变，得用影像设备OCT仪器，它能够精确显示血管内血流动力、粥样硬化斑块等清晰显像资料。可是在看不见、摸不着的千米地下油层，咋监测“冠状动脉”？大庆测试技术服务分公司工程技术人员照样能在地上实时水驱油水井地下状况监测，这就是他们日前研制成功的铠装电缆在高速遥测支持下地过环空小直径（直径28mm）可见光电视测井仪。
这项填补国内外空白的高科技含量影像仪器，能在地面较为清晰地“诊断”千米井下哪层是水哪层是油。
大庆油田经过多年的水驱开发，主力油层生产井的综合含水已超过90％，部分油井的含水已超过98％，尤其是原注水井排附近和原点状注水井周围，由于长期的水驱冲刷，油井进入了特高含水期。
由于油田含水的升高，使挖潜对象变差，增储潜力逐渐变小，剩余油主要分布于厚油层顶部及表外储层，分布零散，且开采难度大，人在地面，根本无法分辨出地下哪是油层，哪是水层。
如果强行开采，将导致油水井注采不平衡，部分井井况变得越来越差，甚至不得不关井。
面对特高含水井产出剖面测井的难题，有人提出，干脆也像医生给病人做血管检查一样，给油水井实施“OCT”影像监测。
别说，这倒提醒了科研人员。
在千米地下给油水井实施影像技术监测，曾经有人提出过这样的设想，不过目前还处于理论探索阶段，没有成熟的技术可借鉴。
咋办？这个分公司科研人员在大量的试验中，边摸索边总结。他们从高含水的成因入手，运用光学影像技术，通过高速遥测短接和井下摄像短接，借助可视化的手段，将井下摄像短接观测到的测井图像用测井电缆实时传输到地面，输送到显示终端。
这样，工程技术人员在地面就能通过这台过环空小直径可见光电视测井仪，直接观察到油水井井筒内流体流动状态，看到气泡、油泡随抽油机运动的涌动过程，以及套管内壁和节箍的状况，实现了水驱油水井产出“所见即所测”的效果。
日前，过环空小直径可见光电视测井仪已经完成仪器的研制工作。该仪器已在标准井、作业井、抽油机井完成了7井次的现场试验，取得了满意的测井资料。
目前，科研人员正在对这台影像仪器相关技术进行完善和改进，下一步将应用于油水井的监测，它将为油田地质专家了解油田开发及动态监测数据需求提供宝贵的第一手资料。

[ytlee]

Borehole camera had been tried in us for over a decade. Frankly, its usage is very limited; esecially as a production survey tool The wax, asphaltene and solid will destroy the len is no time. The current requirement can't meet the 4-20 ma requirement to pass us regulations. In us, borehole camera is dead.

[roc999]

"曾经有人提出过这样的设想，不过目前还处于理论探索阶段，没有成熟的技术可借鉴" ????
google 一下一堆一堆的的。

borehole video这个东西使用条件非常苛刻，不过如果实用的情况下，效果还是不错的。

[topset]

立足国内，这项技术还是很不错的。我们不能一口吃个胖子，上来就跟“国际先进”来比较。

话说回来，所谓“国际先进”也就是纸上谈兵，或者说“paper先进”。我在石油口也有些年了。看到很多工作其实就一般，写起论文来可是不含糊，拉风的很。跟这些paper先进不比也罢，我们踏踏实实的把技术弄出来，把活干了，把钱挣了，其他都是浮云。

[topset]

引用框（ytlee ＠ 12-28-2011 - 14:20）

Borehole camera had been tried in us for over a decade. Frankly, its usage is very limited; esecially as a production survey tool The wax, asphaltene and solid will destroy the len is no time. The current requirement can't meet the 4-20 ma requirement to pass us regulations. In us, borehole camera is dead.

百年油田是来自大庆的老ID了。您说的“wax, asphaltene and solid”这些问题不知道在大庆是否普遍。我觉得asphaltene应该不是问题，结蜡和出砂就不知道了。

不知道您说的4-20 ma是什么单位。

“In us, borehole camera is dead.”
我觉得这是不是有些绝对了。任何技术都有它的适用范围，应该不是整个U.S.都不适用了。

有一个问题倒是真的。中国的人力成本比较低，所以产量很低的井也会管的很细，上个测试看看怎么样。这样的井在美国做测试的可能性不大。

[ytlee]

4-20mA stands for the power loop of the device/tool communication . When the device is standby, it consume only 4mA. When it is active, the max power is 20 mA. Very tough requirement to transmit the video signals.

Here is a link for better explanation

http://en.wikipedia....i/Current_loop.

For now, most communication devices used by petroleum/chemical industry are RS-486, RS232 and HART, the max data thruput for these protocols is very limited. I participated in converting a corrosion monitoring device, the device was certified for 10-50mA.To get 4-20mA certification, we redesigned the PCB (from thru-hole to surface mounted); reduced the chip count, changed the mcu; took me year and half and tons of hair to push the thruput limit to 13K bps (~1-2K byte/second). For video to work, the thruput must be in 30-50K bytes/second. That is 30-50X jump performance requirement.

[roc999]

引用框（ytlee ＠ 12-29-2011 - 23:20）

4-20mA stands for the power loop of the device/tool communication . When the device is standby, it consume only 4mA. When it is active, the max power is 20 mA. Very tough requirement to transmit the video signals.

Here is a link for better explanation

http://en.wikipedia....i/Current_loop.

For now, most communication devices used by petroleum/chemical industry are RS-486, RS232 and HART, the max data thruput for these protocols is very limited. I participated in converting a corrosion monitoring device, the device was certified for 10-50mA.To get 4-20mA certification, we redesigned the PCB (from thru-hole to surface mounted); reduced the chip count, changed the mcu; took me year and half and tons of hair to push the thruput limit to 13K bps (~1-2K byte/second). For video to work, the thruput must be in 30-50K bytes/second. That is 30-50X jump performance requirement.

Coming from the background of tool maker, I do not believe the power consumption was the critical issue killed the market for borehole video logging. It was very easy to achieve 200k-2M BPS via wire line cable.

[ytlee]

引用框（roc999 ＠ 01-06-2012 - 20:05）

引用框（ytlee ＠ 12-29-2011 - 23:20）

4-20mA stands for the power loop of the device/tool communication . When the device is standby, it consume only 4mA. When it is active, the max power is 20 mA. Very tough requirement to transmit the video signals.

Here is a link for better explanation

http://en.wikipedia....i/Current_loop.

For now, most communication devices used by petroleum/chemical industry are RS-486, RS232 and HART, the max data thruput for these protocols is very limited. I participated in converting a corrosion monitoring device, the device was certified for 10-50mA.To get 4-20mA certification, we redesigned the PCB (from thru-hole to surface mounted); reduced the chip count, changed the mcu; took me year and half and tons of hair to push the thruput limit to 13K bps (~1-2K byte/second). For video to work, the thruput must be in 30-50K bytes/second. That is 30-50X jump performance requirement.

Coming from the background of tool maker, I do not believe the power consumption was the critical issue killed the market for borehole video logging. It was very easy to achieve 200k-2M BPS via wire line cable.

As I said in previous post, the solids destroy the lens in no time. Without a reliable cleaning & protective system, the tool is useless.