Method for determining reasonable liquid production capacity of different well groups in offshore oilfield

Abstract

The invention provides a method for determining reasonable liquid production capacity of different well groups in an offshore oilfield. The method for determining reasonable liquid production capacity of different well groups in the offshore oilfield comprises the followings steps: step 1, analyzing differences of different well groups and building a typical well group geologic model; step 2, according to the built typical well group geologic model, researching influence rules of all single factors on reasonable production pressure difference and reasonable liquid capacity; step 3, quantitatively sorting influence degrees of all single factors, and determining main factors influencing the reasonable production pressure difference and reasonable liquid capacity; and step 4, comprehensively considering all main factors, orthogonally designing multiple schemes for optimal computation, and drawing a reasonable production pressure difference and reasonable liquid capacity consulting board chart. The method for determining reasonable liquid production capacity of different well groups in the offshore oilfield has the advantages that the problem that oil well reasonable production pressure difference and reasonable liquid capacity of different oil wells in the sea is difficultly determined under the influence of multiple factors is solved, so that the purpose of greatly increasing the recovery ratio of the offshore oilfield is realized.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining the reasonable fluid production of different well combinations in offshore oilfields. Background technique [0002] Shengli Offshore Chengdao Oilfield is the first oilfield with an annual output of one million tons put into development and construction in the extremely shallow sea area of ​​my country. The oilfield was put into development in 1993. By the end of 2012, the reported proven geological reserves were 405 million tons, and the cumulative oil production was 35.64 million tons, making an important contribution to ensuring national energy security. [0003] However, compared with similar foreign offshore oil reservoirs, Chengdao Oilfield still has the problems of low fluid volume per well and low oil production rate. do not adapt. Therefore, how to increase the fluid volume of a single well in a reasonable and substantial manner a...

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Problems solved by technology

[0004] Affected by the development mode, offshore and onshore oilfields have different definitions of reasonable liquid volume. The production pressure difference is an important factor affecting the liquid volume. If it is too large, firstly, it is limited by the formation pressure and oil production process; The recovery degree within the validity period of the service life is far lower than the ultimate recovery rate, resulting in a waste of underground resources

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