Novel oil protection material

Abstract

A provided novel oil protection material comprises the following compositions: 30-60 parts of 600-mesh fine-mesh calcium carbonate, 30-60 parts of 300-mesh fine-mesh calcium carbonate and 20-50 parts of 100-mesh fine-mesh calcium carbonate. When for use, the above compositions are mixed, the mixture is added into a drilling fluid, and the oil protection material forms a plugging layer on the surface of a storage layer for preventing a harmful solid phase from entering the storage layer and influencing later-period output. During later-period exploitation, fine-mesh calcium carbonate is dissolved only by employing an acid for washing and a channel for storage is recovered. The beneficial effects comprise that the combination of fine-mesh calcium carbonate with different fineness helps to give play to relatively good storage layer protection effect, and the novel oil protection material is especially suitable for new areas with unascertained porosity.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a novel oil-preserving material. Background technique [0002] In the drilling of new blocks, when drilling into the reservoir, it is usually necessary to add some oil-retaining materials to protect the reservoir, and acid-soluble fine-grained calcium carbonate is a commonly used oil-retaining material. When the porosity of the reservoir cannot be determined, the addition of single-mesh fine-grained calcium carbonate often does not achieve a good oil retention effect, and the reservoir will still be destroyed. Contents of the invention [0003] The purpose of the invention is to provide a new type of oil-retaining material with different fineness and excellent oil-retaining effect. [0004] For realizing above-mentioned purpose of the invention, technical scheme of the present invention is as follows: [0005] A new type of oil-retaining material, characterized i...

AI Technical Summary

Problems solved by technology

[0002] In the drilling of new blocks, when drilling into the reservoir, it is usually necessary to add some oil-retaining materials to protect the reservoir, and acid-soluble fine-grained calcium carbonate is a commonly used oil-retaining material. When the porosity of the reservoir cannot be determined, the addition of single-mesh fine-grained calcium carbonate often does not achieve a good oil retention effect, and the reservoir will still be destroyed