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News from Sinopec News Network "The long-term loss-making well TK895X, the original producing oil layer is the deep Ordovician of the Tahe Oilfield.
After the concentrated use of acid fracturing, transfer pumping and other methods to tap the potential is invalid, we have changed from a battle of positions to a flexible and changeable one.
The movement warfare moved the production zone from the deep Ordovician system to the shallow Baigang system, producing 42,000 cubic meters of natural gas per day
.
” On August 9th, at the development analysis meeting of the Third Oil Production Plant of Northwest Oilfield, Zhou Qingyang, the chief financial officer, talked about benefit development.
With the continuous advancement of oilfield development, high-quality reserve sweet spots have been gradually used, and low-grade unused reserves have gradually become the basic resources for oilfield development
.
According to changes in oil reservoirs and product markets, the plant has continuously adjusted the production layer structure, product structure, and reserve structure, and realized the beneficial development of low-grade reserves
Breaking the sequence of oil first and then gas production, flexibly adjust the pay zone
The Tahe Oilfield has a complex strata structure, which is generally characterized by deep oil layers and shallow gas layers
.
Conventionally, the sequence of oil production followed by gas is a principle of Tahe Oilfield development
However, with changes in oil and gas product prices and changes in reservoir energy, this principle is in contradiction with benefit development
.
As early as the end of last year, this contradiction appeared in well TP259HCX
.
At that time, after years of production in the Ordovician of the well's production horizon, crude oil production entered a loss-making range
.
In the battle to increase production and improve efficiency, the factory concentrated superior forces and a variety of technical means to continuously tap the potential of the Ordovician system.
Through a comprehensive analysis of the well, the technical and financial personnel agreed that it is not possible to target a hilltop attack, and that the sequence of oil and gas extraction must be broken.
When the crude oil production layer is negative, the gas production layer in the upper strata should be moved ahead of time.
.
Subsequently, the production layer of the well "migrated" from the Ordovician to the Carboniferous in the shallow strata.
As a result, it produced more than 20,000 cubic meters of natural gas per day, thus removing the loss cap
.
Since last year, the plant has actively adjusted the production zone structure based on efficiency, and adjusted the production zones of 9 wells from Ordovician oil production to Carboniferous gas production, increasing daily natural gas production by more than 200,000 cubic meters and more than 40 condensate oil.
Tons
.
Adjust product structure at any time according to market changes
"The value of the product depends on the changes in market demand
.
The main products of our plant are heavy oil, medium oil, condensate, natural gas, and liquefied petroleum gas
Last year, crude oil prices were sluggish, dropping below US$30 per barrel at the lowest point
.
At that time, the exploitation of heavy oil was difficult to make a profit.
After entering 2021, the price of crude oil has gradually recovered, and the current price has risen to more than 70 US dollars per barrel
.
According to this market change, the plant has brought another "return to the carbine" for heavy oil exploitation.
The production of heavy oil is mainly concentrated in the management area.
According to the product structure adjustment plan of the third oil production plant, this area has increased the daily output of heavy oil by more than 700 The tons rose to more than 900 tons
.
Follow the principle of easy first and then difficult to scientifically adjust the structure of reserves mining
Low grade does not mean lack of taste, and difficult to use does not mean lack of potential
.
The Third Oil Production Plant divides oil and gas reserves into three types: wellbore resources, well-controlled reserves, and un-well-controlled reserves according to the types of stock resources
.
They adjusted the structure and direction of the potential tapping reserves at any time according to the changes in mining methods and geological conditions of the oil reservoir, following the principle of easy first and then difficult, realizing low-cost and effective exploitation of difficult-to-use reserves
In the past, restricted by low oil prices and technical means, the plant focused on the direction of reserves tapping on wellbore resources and well-controlled reserves
.
This year, with the deepening of the joint research of the factory and the application of advanced technology, the factory adjusted its reserves mining structure in a timely manner.
While actively tapping the submerged wellbore resources and well-controlled reserves, it fully attacked the uncontrolled reserves
.
In order to start the uncontrolled reserves, the plant and the Exploration and Development Research Institute of the oilfield company actively carried out in-depth research on the fault-controlled karst system, using DSG reservoir analysis technology to investigate 10 potential "sweets"
.
At present, in the fault-controlled rock volume system, the plant has achieved the goal of increasing annual reserves of more than 500,000 tons in low-well control areas and un-well-controlled areas through technical means such as large-scale acidification and short-radius sidetracking
.
(Ma Jinglin and Lu Haitao)
