Method for increasing throughput utilization radius after high-round throughput

Abstract

The invention relates to the technical field of oilfield development, in particular to a method for increasing the throughput utilization radius after high-round throughput. The method comprises the steps that 1, steam injection, soaking and well opening production are conducted on a target oil reservoir production vertical well; step 2, determining a throughput round of which the production radius of the target oil reservoir is slowed down and a corresponding production radius; 3, after the huff-puff cycle reaches the determined turn that the use radius is slowed down, steam huff-puff is stopped, and water jet perforation is carried out; and 4, performing steam injection, soaking and well opening production on the huff and puff well subjected to water jet perforation. According to the method, the sweep range of injected steam is effectively enlarged, heat loss caused by repeated heating is reduced, the utilization radius of the later huff and puff period is effectively increased, and the single well accumulated oil production is increased.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for increasing the throughput radius after high rounds of throughput. Background technique [0002] Shengli Oilfield produced 587 million tons of geological reserves of heavy oil reservoirs. Shengli's heavy oil development method and production contribution are dominated by steam huffing and puffing. In 2019, the annual output of heavy oil was 4.425 million tons, and the annual output of steam huffing and puffing was 4.27 million tons, accounting for 96.8%. The throughput development is in the mid-to-late stage of development. The average throughput rounds in Shengli East is 6.7, and the average throughput rounds in Shengli West is 18. With the increase of throughput rounds, affected by the limited utilization radius of throughput, the development effect continues to deteriorate, resulting in throughput mining. The yield is low, only 20.3%, and nearly 80% o...

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Problems solved by technology

The above characteristics of Shengli heavy oil reservoirs are not conducive to steam flooding, especially the current low crude oil price, and the efficiency of steam flooding is poor, so it is difficult for Shengli heavy oil to replace production by steam flooding

[0004] The higher the throughput rounds, the smaller the increase in the heating radius. Even if the dryness is increased, the expansion of the heating radius is limited, and the higher the throughput rounds, as the oil saturation around the well point decreases, the validity period of the cycle becomes shorter and shorter. The steam is mainly used to heat the water around the well point, and the heat utilization is getting lower and lower; and the cost of post-measures is relatively high compared with the cost of thin oil, and the cost per ton of oil continues to rise

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