Method for exploiting high viscous and congealable crude oil with water-jet cutting technology

Abstract

A method for exploiting high viscous and congealable crude oil with a water-jet cutting technology is applied to exploiting high viscous and congealable crude oil in oil field. The method comprises the following steps that: a flow string is inserted into a casing, the lower end of the flow string is connected with a jetting tool, an ejector on the lower end of the jetting tool is inserted into the depth of the solidifying point of the high viscous and congealable crude oil in a well; a packer is set; and waste water or clear water of the oil field which are separated are filled in a well; and an oil pumping unit is also switched on to drive a plunger in an oil well pump to do reciprocating motion. The filled waste water or clear water of the oil field and the exploited liquid can be simultaneously conveyed to ground surface by the oil pumping unit. The invention has the effects that: with the method, the exploitation of high viscous and congealable crude oil is more effective, energy-saving and environment friendly. The high viscous and congealable crude oil is cutted into fine particles by the waste water or clear water of the oil field at vicinity of the solidifying point, the fine particles can be further solidified under the action of cooling water to form crude oil particles with a certain hardness and without emulsification and wax precipitation, and the phenomenon of emulsification and wax precipitation during the crude oil exploiting process can be solved.

Description

technical field [0001] The invention relates to the technical field of oil extraction in oilfields, in particular to a method for oil extraction of high-viscosity and high-condensation crude oil, which is a method for cutting crude oil into fragments by using a hydraulic cutting method and lifting the crude oil by using a plunger pump. Background technique [0002] At present, high-viscosity and high-condensation crude oil has the characteristics of high viscosity, high freezing point, and strong sensitivity to temperature. During the mining process, the flow resistance is large, which also causes a substantial increase in the suspension point load. The high-viscosity and high-point-point crude oil is a degassed crude oil with a freezing point higher than 50 degrees Celsius and a viscosity of 1000 mpa.s or higher at 50 degrees Celsius. In the actual mining process, the main performance is that the suspension point load is large during the upward stroke, and the downward spee...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for mining high-viscosity and high-condensation crude oil by hydraulic cutting. The hydraulic cutting method is used to cut the crude oil into pieces, and the plunger pump is used to lift the crude oil to solve the problem of high viscosity and high-condensation crude oil flow resistance. Difficult to mine problem

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