Method for uniformly injecting multi-component thermal fluid in horizontal well

Abstract

The invention provides a method for uniformly injecting a multi-component thermal fluid in a horizontal well. The method comprises the following steps: (1) segmenting horizontal segments in the horizontal well; (2) initially setting the size of each discharge orifice on a tubular column in each segment of the horizontal well and the number of discharge orifices at a tail end; (3) detecting the temperature, pressure and dryness of the multi-component thermal fluid; (4) obtaining the on-way temperature, pressure, dryness and heat loss of each shaft segment of the horizontal well by iterative calculation; (5) obtaining the actual number of the discharge orifices on the tubular column in each segment of the horizontal well and the size of each discharge orifice by iterative calculation; and (6) drilling the tubular column based on the calculation result, putting the tubular column subject to drilling down into the well, and injecting the multi-component thermal fluid in the tubular column. The invention has the advantages of wide oil pool application range, relatively simple technology and low cost, and ensures that the oil pool at the horizontal well segment can be subject to uniform steam injection without changing the traditional well orifices and steam injection pipes. Besides, by using the invention, the producing degree of the oil reservoir is improved and the optimal exploitation effect can be ensured by injecting the multi-component thermal fluid in the horizontal well of the exploited oil pool.

Description

technical field [0001] The invention relates to heavy oil thermal recovery technology, in particular to a method for uniformly injecting multi-component thermal fluid into a horizontal well. Background technique [0002] At present, the offshore heavy oil field is developing multi-element thermal fluid (N 2 +CO 2 + steam) huff and puff application test. The field measurement and simulation studies of horizontal wells at home and abroad show that the general steam injection method of horizontal wells is likely to cause local gas intrusion in the horizontal well section and uneven production of the reservoir, and the well producing well section in the horizontal section only accounts for 1 / 3- 1 / 2, moreover, the uneven production of horizontal section reservoirs will intensify with the increase of steam injection period, and even cause local steam channeling and water production. [0003] Overseas Canadian and domestic Liaohe oilfields have focused on the research and applic...

AI Technical Summary

Problems solved by technology

The double-pipe steam injection technology can realize the dynamic adjustment of the steam injection volume at the wellhead, improve the utilization rate of steam injection, and improve the development effect of horizontal wells to a certain extent, but the technical requirements and costs are high

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