Sand consolidation and water plugging profile control agent made by oil sand

Abstract

The invention relates to a sand-consolidating and water-blocking profile modifying agent for oil sludge sand. The profile modifying agent is prepared by mixing the following raw materials: oil sludge sand, 10 to 90 portions of consolidation agent or adding modifier, a consolidation accelerant or a consolidation retardant; the oil sludge sand is subjected to ball milling through a ball mill; part of large crude oil is separated off so as to reach the requirement of granularity of the profile control agent; therefore, the oil sludge sand with granularity of less than 200 meshes is less than 70 percent of the total mass of the oil sludge sand; and the consolidation agent is selected from one or a mixture of one or more of cement or cement clinker, steel slag, slag, pulverized coal ash, gypsum, lime and magnesia. In application, the profile control agent is prepared to a 1 to 20 percent suspension solution; and the suspension solution is injected into a deep part of stratum of an oilfield through profile modification equipment. The profile modifying agent fully utilizes mass oil sludge sand produced in the production process of various oilfields, realizes the aim of emission reduction; and the oil sludge sand is recycled and is used as the sand-consolidating and water-blocking profile modifying agent, thereby achieving the aim of consolidating sand, blocking water and improving extraction yield.

Description

technical field [0001] The invention relates to a resource utilization method of solid waste oil mud sand in oil fields, in particular to using oil mud sand as an oil field sand-fixing water plugging and profile control agent. Background technique [0002] Oilfields, especially unconsolidated sandstone oilfields, mainly come from the water injection development process. As the water content of the produced fluid increases, more and more formation mud and sand are brought out by the produced fluid. In the dehydration tank and oil storage tank of the combined station , Sewage oil tanks and other bottom deposits, a large amount of oil sludge sand will be produced after the tank is cleaned; in addition, crude oil spilled and polluted soil caused by equipment perforation, operation and oil theft damage in the oilfield production process will be collected to form oil sludge sand. The composition of oilfield oil sand is complex. The oil content is high, generally 0.1-50%, the wate...

AI Technical Summary

Problems solved by technology

At present, harmless treatment is generally adopted, but there are deficiencies in each method, such as: the stacking method is mainly based on biological action, the time is generally 25 years, the land is occupied, and the environment has been polluted during the stacking process; the burning method: due to oil The oil and water content of mud and sand is uncertain, and it is difficult to implement in technology, and it consumes energy during the implementation process, and the cost is high; washing method: it is difficult to wash to meet the standard discharge, and consumes energy and water, and the cost is high; firing bricks: the strength is low. meet the requirements of building materials; other resource utilization methods can use part of the oil sludge sand, but the limited amount cannot achieve zero emissions