A filling-free self-adaptive sand control method

Abstract

The present invention provides a non-filling self-adaptive sand control process, which comprises: step 1, optimizing process parameters according to data such as reservoir physical properties, geological structure, reservoir sand particle size analysis and numerical simulation; step 2, Treatment of wellbore opening; step 3, high-permeability resin sand consolidation, including flushing the sand to the position required by the design, running the construction string according to the design requirements, pre-treating the oil layer, and then selecting a high-permeability resin sand consolidation agent to squeeze the resin Molded sand-consolidating agent and displacement liquid, after the pressure naturally diffuses, the construction pipe string is slowly raised, and waits for Hou to solidify; step 4, lowering the self-adaptive sand control expansion sand control pipe string. The main advantages of this process technology are: no filling operation, simplified construction process, low cost and no risk. Use high-permeability resin to fix the quicksand, and the fluid will pass through naturally, so as to prevent sand but not oil. The self-adaptive graded expansion material allows sand particles smaller than 40 microns to pass through directly, and the sand control can be better if the sand is truly passed.

Description

technical field [0001] The invention relates to the fields of oil and gas fields and natural gas hydrate development, in particular to a filling-free self-adaptive sand control process method. Background technique [0002] Unconsolidated sandstone heavy oil reservoirs and natural gas hydrate reservoirs are limited by the physical and fluid properties of the reservoirs. Such reservoirs usually have problems such as low liquid volume, high water cut and severe sand production during the development process. At present, sand filter tubes are generally used in conjunction with conventional circulation filling, extrusion filling and other technical measures to treat oil wells. However, due to the limitation of single gravel size in the sand control layer, construction displacement and relatively small sand ratio, the effective period of sand control is still short after the measures are put into production. Problems such as serious loss of fluid production and other problems seve...

AI Technical Summary

Problems solved by technology

At present, sand filter tubes are generally used in conjunction with conventional circulation filling, extrusion filling and other technical measures to treat oil wells. However, due to the limitation of single gravel size in the sand control layer, construction displacement and relatively small sand ratio, the effective period of sand control is still short after the measures are put into production. and serious loss of liquid production, etc., seriously restricting the efficient development of this type of reservoir

At the same time, deepwater sand control operations are facing severe challenges, and the weight of sand control operation costs in the production costs of a well is also increasing

[0003] At present, single-size gravel is used for filling sand control in polymer injection flooding wells in unconsolidated sandstone reservoirs. The main problems are as follows: (1) The viscosity of the fluid produced in the accumulation well increases and the sand-carrying capacity is enhanced. Sand production shortens the effective period of oil well sand control; (2) Due to the lack of pertinence in the sand control technical measures adopted, some oil wells have a low liquid volume after sand control, which cannot achieve the purpose of liquid extraction; The joint action of formation particles and other factors lead to clogging of formations and sand barriers, resulting in a sharp drop in fluid production in some oil wells, affecting the effect of polymer injection production

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