Monolayer new chemical development method for thick-layer fault block oil reservoir in suspend production for years

Abstract

The invention provides a monolayer new chemical development method for a thick-layer fault block oil reservoir in the suspend production for years. The method comprises the following steps: step one, predicting and correcting the well deviation of a vertical well according to a distinguishing mark of the well deviation of the vertical well; step two, on the basis of the correction of the well deviation, combining the well and the shock, and determining the plane positions of broken edges and the forms of faults; step three, on the basis of elaboration of remaining oil, under the direction of technical policy boundary, designing a horizontal well close to the broken edges, and controlling an enrichment region of remaining oil; step four, arranging a well outside an original oil-water boundary, and carrying out water injection with great discharge capacity. According to the monolayer new chemical development method for the thick-layer fault block oil reservoir in the suspend production for years, the enrichment region of remaining oil can be effectively controlled, and the water-drive controlled reserve and water-drive flooding are improved, so that the method is advanced in technical idea and simple and convenient in application, and provides technical support for reusing the thick-layer fault block oil reservoir in the suspend production.

Description

technical field [0001] The invention relates to the field of enhanced water flooding recovery in complex fault-block oil reservoirs during extra-high water-cut periods, in particular to a new single-layer development method for thick-layer fault-block oil reservoirs that have been out of production for many years. Background technique [0002] Fault-block oil reservoirs have produced geological reserves of 1.53 billion tons (accounting for 35.4% of Shengli Oilfield); annual oil production of 8.04 million tons (accounting for 29.5% of Shengli Oilfield), is an important type of oil reservoir in the oil field, and currently has a high water cut (91.2%). With less investment, the imbalance between storage and production is prominent. How to greatly increase the recovery rate of mature areas and maintain the scale of remaining recoverable reserves has become the main problem facing the development of fault-block reservoirs. There are various types of fault-block reservoirs. Thic...

AI Technical Summary

Problems solved by technology

There are various types of fault-block reservoirs. Thick-reservoir fault-block reservoirs have the geological characteristics of large single-layer thickness and large reserves. Due to the long development time, vertical wells have been shut down for many years due to high water cut. Currently, the reservoir is at a high recovery level and is basically abandoned for development stage, after years of oil-water re-migration in the reservoir, the remaining oil is enriched for the second time in the high position, but the oil-bearing strip is narrow, and the oil-bearing strip in the remaining oil-enriched area along the fault line is only 30-50m, and conventional horizontal wells cannot be normally developed Difficulties; in addition, because the water injection method has gone through the process of edge water injection in the early stage and transition to waist water injection in the middle and late stages, the reserves in the waist and edge of the ultra-high water cut period are out of control, and they still have the characteristics of a large amount of remaining oil. Therefore, it is urgent to adopt a new Technical approach to redevelop oil reservoirs to further enhance oil recovery

Images