Wax cleaning agent for hot water dispensing deep well high-pour point wax

Abstract

The invention discloses a wax cleaning agent for hot water dispensing deep well high-pour point wax. The wax cleaning agent comprises three independent components including an agent A, an agent B and an agent C; the agents A, B and C are sequentially used in cooperation; the aim of cleaning is achieved by use of the reaction heat and the wax dissolving and dispersing effect of aromatic hydrocarbon; the wax cleaning agent is easy to prepare, the construction is convenient and effective, the safety coefficient is high, the operation time is short, the wax cleaning is thorough, the construction is finished in 2 days, and smooth operation of a lower packer is guaranteed; and moreover, the cost is saved by 30%, the time is saved by 90%, and the oil well extraction time is obviously prolonged.

Description

technical field [0001] The invention relates to the composition technology of C09K8 / 60 increasing output by acting on underground structures or the composition technology of C09K8 / 00 used for drilling or well drilling, and belongs to the field of oil recovery chemical additives in oilfields, especially hot water split injection deep well high Wax remover. Background technique [0002] There are many problems in oil production that need to be solved by new technologies. Waxing in oil production systems is a common problem. For thin oil or heavy oil wells with a solid point of ≥ 90 ℃ and a well depth of ≥ 2000m, wax deposition in the casing annulus, using The effect of hot washing and mechanical wax removal is poor, or even ineffective. The reason is that in conventional hot washing, the temperature of hot washing at the waxing point is lower than the melting point of wax. Because the wax is hard and sticky, mechanical wax removal cannot be performed. , so that conventional m...

AI Technical Summary

Problems solved by technology

[0002] There are many problems in oil production that need to be solved by new technologies. Waxing in oil production systems is a common problem. For thin oil or heavy oil wells with a solid point of ≥ 90 ℃ and a well depth of ≥ 2000m, wax deposition in the casing annulus, using The effect of hot washing and mechanical wax removal is poor, or even ineffective. The reason is that in conventional hot washing, the temperature of hot washing at the waxing point is lower than the melting point of wax. Because the wax is hard and sticky, mechanical wax removal cannot be performed. , so that conventional minor workover cannot be completed, and there are obstacles such as the inability to run the packer or the packer is not tightly sealed; The time is as long as more than 15 days, which seriously affects the production of oil wells

[0003] In the known technology, when the paraffin removal agent in the oil well casing annulus is applied, due to the high formation pressure of some oil wells, in order to meet the needs of production, casing gas or casing production is sometimes released, resulting in casing wax deposition. For such wells, if If the layer needs to be repaired, the packer must be installed at the original perforation; once a casing leak occurs, the packer must also be installed when repairing the leak, and the packer will not be tightly sealed due to the wax deposition on the casing , resulting in the packer not being able to be opened, and even in the case of severe casing wax deposition, sometimes it may cause that the well gauge is not in place during the workover, and the pump cannot be lowered; and in this case, it is hot washed first, and then lowered The wax is mechanically scraped by the well gauge, but due to heat loss, the hot water vapor at 110 °C is already lower than 90 °C when it reaches below 1000 meters, so for paraffin wax freezing point ≥ 90 °C, well depth ≥ 2000m, hot washing is inevitable No effect, this kind of wax is generally viscous and stretchable, especially the deep well casing is easily deformed, so the well gauge cannot be lowered. , there will be a lot of wax sticking to the packer. After the packer goes down, it cannot be opened, resulting in plugging; It takes 15-30 days, and the workover cost is high and wasteful

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