Dual-purpose agglutination sand for oil-field development

Abstract

The invention discloses dual-purpose cemented sand used for oilfield development and aims at providing the dual-purpose cemented sand which cements and solidifies under the water bath environment, improves the ultimate recovery of the oil well, has good effects of sand prevention, leak stoppage, water plugging and profile control and effectively protects the oil layer. The dual-purpose cemented sand contains the following components according to percentages by weight of 60-80 percent of mixing chamotte of sulphoaluminate and ferrous aluminate, 10-20 percent of sintering porcelain granules and 10-20 percent of quartz sand. The dual-purpose cemented sand belongs to inorganic material, has strong inertia, stable performance, no harms to the human body, no pollution to the environment, low cost and can effectively protect the oil layer. As the dual-purpose cemented sand has the adsorptivity and the cementation and solidification performance among granules in the water bath environment, after entering into the stratum, the dual-purpose cemented sand cements and solidifies to form an artificial borehole wall under the water bath environment, thereby being capable of satisfying the cementing strength and the permeability required during the production. When the dual-purpose cemented sand is used for the measures of sand prevention, leak stoppage, water plugging and profile control, and the like, the construction process is simple, the construction period is short, the construction cost is low, the measure effect is good and the validity period is long.

Description

technical field [0001] The invention relates to the field of petroleum, and more specifically relates to a double-effect cemented sand (cemented and solidified material) used in technological measures such as sand control, water shutoff, profile control and leak plugging in petroleum development. Background technique [0002] In the oil development of sandstone reservoirs, the main contradictions affecting the normal production of oil and water wells are: severe sand production, high water cut lead to short production cycle of oil and water wells, and low recovery. In oil and water well repair operations, the well fluid is seriously lost, causing varying degrees of damage to the oil layer and even blowout; the sand control methods currently used in the field are complicated in process and high in cost. The conventional plugging methods are mostly polymer plugging agents, which have poor plugging effect and pollute the oil layer to varying degrees. However, the existing wate...

AI Technical Summary

Problems solved by technology

[0002] In the oil development of sandstone reservoirs, the main contradictions affecting the normal production of oil and water wells are: severe sand production, high water cut lead to short production cycle of oil and water wells, and low recovery

In oil and water well repair operations, the well fluid leaks seriously, causing varying degrees of damage to the oil layer and even blowout; the sand control methods currently used in the field are complicated in process and high in cost

The conventional plugging methods are mostly polymer plugging agents, which have poor plugging effect and pollute the oil layer to varying degrees

However, the existing water plugging and profile control technology has long construction period, high cost and poor effect

In the prior art, the mixture of cement and sand has very low permeability and poor high temperature resistance. During injection construction, cement mortar is easily diluted by formation liquid, and a large amount of cement cannot be consolidated, so it cannot meet the requirements of oil development.