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86 days is not a fixed time limit. For example, Well Bo 1 in Shisantu Village has a leak of 1000 meters, and there will be nothing below, so the stalls can be closed as soon as possible.
The unlucky example is that the Bo 7 well in Dongying Village, which is currently being drilled, broke when it reached 1700 meters, and a 370-meter-long drill pipe broke inside.We had to remove the 1300-meter-long remaining drill pipe first, put in a broken-rod overhauler, and continue after about 10 days of tossing.
Rod breaking is not the worst accident. The worst accident is that the entire wellbore is abandoned, and then the drilling has to be abandoned, and the drilling tower is dismantled and shifted by 300 meters before drilling a new well.
Li Siguang is now located in the north of Wanggang Village, and the drilled well is the Bo 5 well.
Three days ago, the drilling team reported that Bo 5 and Bo 6 wells were the first to drill to the predetermined depth, and some discoveries were made.Li Siguang immediately went from Jinan to Bohai District.
"Well Bo 5, north of Wanggang Village, Bohai District, Shandong, south of (revised) Wanggang inherited anticline structure in Dongying Sag. Well depth is 2590 meters, and oil source rocks of Wanggang Anticline Formation were discovered. Established 'Wanggang Anticline Formation '."
A section of core taken out from a depth of 2300 meters underground, a cylinder with a diameter of 150 mm and a length of 1.2 meters.There is no doubt that it is an oil rock. Li Siguang raised one end of the core and put it upright. He leaned down and sniffed the core, and he could faintly smell the oil.
No oil flow was found, but oil-bearing structures were found, which shows that the results of computer numerical simulation are very reasonable.
There are oil rocks in this place, which means that there are areas in this area that are richer in oil hydrocarbons and that the soil can store oil.If such a zone has an area of several square kilometers, it is called an oil field.The key now is where such an area of several square kilometers is.
Li Siguang jumped into the Land Rover, left Well Bo 5, and drove to Well Bo 6 in Sanshuijing Village.
……
"Well Bo 6, west of Sanshuijing Village, Bohai District, Shandong, east edge of Shajie-Guantao Sag, Dongying Sag. The well is 2660 meters deep, with red beds below N, and no oil and gas shows."
Li Siguang came to the core storage area next to the drilling tower, checked the sampled cores taken from 1700 meters to 2500 meters one by one, and made sure that none of them were oil rocks.
The rig has been quiet since yesterday.Drilling to 2660 meters, the task has been completed, it is time to stop drilling and transfer.Drilling workers in China and the Soviet Union are pulling out the drill pipe from the well, and dismantling this section of drill pipe when it is exposed tens of meters, and then continue to pull out and continue to dismantle.The ancillary equipment around the drilling tower is also being packed and packed, the drill pipes are taken out, and the drilling tower is dismantled after the drill bits are put away.
Li Siguang inspected the core and recorded the rock and soil information at different depths in his notebook.The drilling of Well Bo 6 has good news: the previously revised geological structure has not been overthrown again.This shows that Li Siguang has gradually grasped the underground structure of the Bohai Sea after several explorations and revisions.
Well Bo 7 in Dongying Village.
Because of the broken rod not long ago, Captain Grubenikov Kutz personally took charge of the Bo 7 well.
The site of Bo 7 well in Dongying was very busy.More than 2000 meters below ground, drill bits fractured the formation and pulverized the rock.Drilling fluid is pumped through the hollow drillpipe to the drill bit, bringing soil or rock debris to the surface.
Drilling fluid and debris spewed out the side of the rig like a giant peeing.Drilling fluid falls into a large pool, where debris is filtered out and then pumped back into the well for repeated cycles.
Before it was time to take the core, Li Siguang walked to the drilling fluid pool and smelled the smell of the drilling fluid pool against the wind at a distance of more than ten meters. There was no smell of petroleum except for the smell of engine oil.
"Drilling in Well Bo 7 has resumed, but due to the rod break accident, the current depth is only 2150 meters. If everything is normal, it will reach 2500 meters in a week. Then you will see the results." Kutz said.
Li Siguang: "What's the current progress of Bo 8 well?"
库茨：“昨天的记录是2420米。……渤8井这一次也并不顺利，要知道渤8井和渤6井是先开钻的，比渤5井和渤7井早9天。渤8井中间也出现了一些事故。”
Li Siguang: "Yesterday it was 2420, so today it is almost 2500 meters. I should go to Zhanggai Village for a short stay."
……
Well Bo 8 in Zhanggai Village.
The scene was similar to that of Well Bo 7 in Dongying. The drilling tower was making "boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom" drilling fluid was flowing into the liquid pool beside the tower, and workers were busy around the tower.
"We are now drilling a rock formation, which is quite thick. This is the core taken at 2350 meters." Captain Hong pointed to a section of core and said to Li Siguang, "It may take several days to drill. Drilling through this rock formation cap probably has The depth is 2600 meters, try another day or two, if there is no result, we should withdraw."
This section of core is not oil rock.
"Let me take a look at your drilling logs."
Li Siguang focused on the drilling logs below 1700 meters.
"Zhanggai Village is a geological depression area, but the rock cap is not a depression, but a raised dome structure. Moreover, from the elasticity of the rock layer during drilling, it can be seen that the dome area is not large, just Bohai Well 8 happened to be drilled on the rock cap." Li Siguang said, "So firstly, its thickness is thinner than conventionally estimated, and secondly, what is it that makes it protrude upward?"
According to Li Siguang's deduction, it does not take a few days to drill through this rock formation, but it will pass through the rock formation tomorrow and enter a new unknown formation.
Li Siguang decided to stay in Zhanggai Village for one night.
……
The next day, March 12.
The sun shone listlessly on the Yellow River estuary plain in the winter morning, and Li Siguang and the oil workers present did not feel much warmth.
At 11:30 in the morning, the rock debris brought out by the drilling fluid turned into a large amount of soil + a small amount of rock debris, and the drill bit became obviously easier to work.
"Sure enough, we have passed through the rock formation," Captain Hong said, "Now we are at 2530 meters, and we have entered the structural layer under the rock."
At 13:30, drilling continued.
The team leader and Li Siguang each wrapped green onions in a pancake, chewing and watching the operation of the Bo-8 well.
15:30.
Drilling worker Xiao Chen dragged dozens of kilograms of powder boxes past the drilling fluid pool. "Captain! The oily smell of the liquid pool is so strong!"
Li Siguang and Captain Hong walked to the drilling fluid pool.Now you don't need to be downwind, just walk a little closer to the drilling fluid pool, and you can smell the heavy, penetrating oil smell.Not only can you smell, but you can also see oil blooms on the surface of the drilling fluid pool.
Captain Hong: "Oil-bearing structure?!"
Li Siguang: "This is not just an oil-bearing structure... It is actually an oil field of light oil."
Captain Hong: "Let's evacuate a little distance..."
In the past few minutes, the surface of the drilling fluid pool has become a layer of oil instead of dots of oil.The drilling fluid is just under the oil layer, just like the home-cooked food cooked by Kuanyou Wanggang.
16:00.
"Bang! Huh———"
"Is this a blowout?" Xiao Chen was startled by the loud noise.
Captain Hong: "No, this is industrial oil flow."
2600 meters underground, oil and natural gas have been buried for hundreds of millions of years, gathered, squeezed, and compressed during geological movements. When a hole appears in the formation, the high-pressure oil flow burst out instantly, and drilled out of the ground along the wellbore .
This is an exploration well, no tubing was built, and it was set on fire.
……
At the mouth of the Yellow River in the evening, the villagers of Zhanggai Village and a dozen nearby villages all saw strange sights they had never seen before.
"Damn, such a big fire?"
"Is the drilling tower on fire, shall we fight the fire?"
"No, no, no, I understand this, it's oil!"
On one side of the Bo 8 well, the high-pressure oil and gas spewed out together with the raging flames are more than [-] meters high, like a giant torch on the plain.