Double packer steam injection integrated device and method for heavy oil development in oilfield

Abstract

The invention relates to the field of oilfield heavy oil exploitation equipment, in particular to a double packer steam injection integrated device and method for oilfield heavy oil exploitation. The technical solution is: the lower end of the upper packer is connected to the lower packer through the layer spacer tube and the connecting core tube, the lower end of the steam injection valve is equipped with a seat sealer and a one-way oil recovery unit; the inner cavity of the upper packer is installed with a hand The core tube, the lower end of the lost core tube is connected to the layer spacer tube, the connecting core tube, and the compensation core tube. The lower end of the compensation core tube passes through the lower packer and is connected to the seat seal steam injection plug, and the lower side of the ball seat is provided with a seat seal The seat sealer is fixedly connected to the casing inner cavity of the steam injection valve by locking the fixed force pin. The beneficial effect is that the present invention is lowered into the well at one time, so that the seat seal of the two oil layers is reliable, and the material injected during steam injection is avoided. The efficiency of steam injection is improved due to the loss of energy, and at the same time, the corrosion of oil well casing is reduced, and the service life of oil well is prolonged; the construction procedure is reduced, the labor intensity of workers is reduced, and the construction period is shortened.

Description

technical field [0001] The invention relates to the field of oil field heavy oil production equipment and methods, in particular to a double packer steam injection integrated device and method for oil field heavy oil development. Background technique [0002] In the process of oil extraction, there are a large number of heavy oil wells. Therefore, heavy oil plays an important role in oil extraction. Because heavy oil has the characteristics of long molecular chain hydrocarbons and molecular weight, the resulting viscosity is high and the fluidity is poor. Therefore, there are difficult characteristics in the development of heavy oil. At present, the exploitation of heavy oil mainly adopts the method of thermal recovery. Since the viscosity of heavy oil is very sensitive to temperature, within a certain temperature range, the viscosity of heavy oil will decrease obviously when the temperature rises. The viscosity of the oil drops by about half; when the long-chain structure ...

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Problems solved by technology

[0003] In addition, there are still some heavy oil wells, and the form of the downhole oil layer is: the upper layer is water, and the lower layer is heavy oil. In this way, during the steam injection process of compound carbon dioxide, due to the poor sealing of the upper layer, when the steam of compound carbon dioxide is injected into the lower layer , often the upper layer will absorb a large amount of steam, which will cause a lot of waste of heat and injection materials. At the same time, due to the following reactions between carbon dioxide and water: CO 2 +H 2 O=H 2 CO 3 , and the generated carbonic acid is unstable, it will produce hydrogen ions and bicarbonate ions, and then corrode the metal casing, thereby reducing the service life of the oil well and causing large economic losses; moreover, when running two packers , all adopt the method of lowering in multiple times, which not only increases the construction procedure, increases the labor intensity of workers, and prolongs the construction period, but also requires multiple docking, which is likely to cause sealing failure, and then cause a large amount of heat and injected substances. waste of

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