Ten years of grinding the sword and gnawing hard bones-Shengli Oilfield Petroleum Engineering Technology Research Institute scientific and technological breakthrough of beach dam sand oil reservoir record

On October 17, news came from Shengli Oilfield Luming Oil and Gas Exploration and Development Co.
, Ltd.
that after the implementation of segmented fracturing technology in the 435-4HF well, the company's key horizontal wellside of beach sand has obtained high-yield industrial oil flow, with a daily output of 67 tons of liquid and 16 tons of oil per day, and has accumulated nearly 600 tons
of oil.
"It's been 10 years, and finally gnawed this hard bone!" Zhang Yanyuan, secretary of the party branch of the fracturing institute of Shengli Oilfield Petroleum Engineering Technology Research Institute, sighed
.

"Potato" hot hand Ten years on hold

Ten years ago, Shengli Oilfield deployed the Bin 435-4HF development preparation well in the thin interbedded oil reservoir of beach dam in the Lijin Depression zone, but the Bin 435-1HF well that was completed in the early stage encountered the dilemma of not being able to be pressed open and unable to add sand, and only 15 cubic meters
of sand were added to the construction of the 6th section.
Not only that, the well also has a series of problems
such as strong sand plasticity of beach dams, fracture slippage along the interface of sand and mudstone, and limited opening width of hydraulic fractures.

"I was fracturing on site, and as we all know, the beach sandstone reservoir is a hidden oil and gas reservoir, and we faced unprecedented problems
.
" Xiao Chunjin, secretary of the party branch of the new technology promotion center of Shengli Engineering Institute, recalled
.

At that time, under the background that the Bin 435-1HF well could not be pressed, the Bin 435-4HF well was drilled, and Shengli Oilfield invited a number of well-known domestic and foreign oil service companies, university reserve reform teams, key research institutes, etc.
to participate in the demonstration of the transformation plan of this world-class problem, and finally none of them submitted effective measures, resulting in the well production plan has been shelved
.

"Duck" diving is secretly hard

It's like a volcano extinguishing enthusiasm
.
Oilfield technology lowered its head
in front of this "roadblocker".
But there is a group of people who have not given in, they are like magma, surging in the undercurrent
.
"Since 2012, the plan for this well has been discussed almost every year, and everyone can't let it go
.
" Zheng Bintao, manager of the Fracturing Digital Model Research Office of the Fracturing Institute of Shengli Engineering Institute
, has been holding his breath.

He and his colleagues were unwilling to let the well sleep forever
.
Indoor physical model test, digital model analysis, new technology research, working fluid optimization demonstration.
.
.
After more than 60 times of repeated demonstration, updating the research results again and again, and revising the technical scheme round by round, the demonstration content covers rock mechanics, fracture extension true triaxial physical model, sandstone acid damage, fixed face perforation, penetrating and expansion height, etc.
, only the data of the experiment and demonstration analysis of 435 horizontal wells in the coast occupies 2 gigabytes
of storage space.

"Rooster" sings "Oil Dragon" takes shape

Finally, in 2022, with the arrival of shale oil development spring, the 13-layer fracturing plan of the Bin 435-4HF well was finally finalized and entered the implementation period
of production.
However, the problems have not been reduced because of this, it can be said that one after another
, one after another.

The low internal pressure strength of the casing in the early stage has limited the improvement of construction displacement and transformation parameters, and the sudden leakage of the casing in the horizontal section, the bridge plug cannot be pumped into place, the bridge plug and perforation have been stuck many times, and the perforation gun cannot be in place, etc.
, and the completion is facing greater risks
。 After 10 years of tempering, the scientific researchers are no longer discouraged, they face the difficulties, brainstorm, day and night, decisively propose a series of innovative measures such as oil-connected multi-cluster perforation + rope knot temporary plugging stratification + secondary fracturing large-scale sand addition in the horizontal section below the leakage point, and finally overcome many difficulties to complete the 7-section, 12-layer fracturing construction of the well, with a total of 1,110 cubic meters of sand added and 19,470 cubic meters of well fluid, and the transformation plan was a complete success
.

The monitoring data shows that the shape of the volume fracture network in the reservoir is basically formed, and the transformation of the main layer is balanced, and the transformation range reaches 8.
648 million cubic meters
.
The underground oil flow channel was opened, and the "oil dragon" was
formed.

The successful transformation of the well broke through the bottleneck of adding sand to horizontal wells in domestic beach and dam sand and explored a way for the effective development of horizontal wells in beach and dam sand reservoirs, which provided strong support
for the effective use of 11.
86 million tons of reserves in 435 bin.