A kind of scale cleaning method of water injection well

Abstract

The invention discloses a scaling cleaning method for a water injection well, which comprises the following steps: constructing a hydraulic jet vehicle delivery high-pressure water flow system composed of a coiled tubing, a coiled tubing hydraulic jet vehicle, a high-pressure pump, a hydraulic pipeline and a water supply pipeline; Install the wellhead tee and blowout preventer; the coiled tubing guide rails limit the travel path of the coiled tubing; install the wellhead bracket and the wellhead injection head, and use the wellhead bracket to implement a fixed connection to the wellhead injection head; rerun the coiled tubing and the φ42mm rotary nozzle to continue Deepen the flushing, lift up 20m of active coiled tubing after every 100m of footage, and the circulating return flow rate is not less than the injection rate until the first stage packer; lift up the coiled tubing 2m and stay for 20min, do not stop the pump when it stays in the well, and wait for the oil in the tubing After the removed scaling is stable up or down, the coiled tubing is lowered for washing; the scaling cleaning method of the water injection well provided by the present invention greatly facilitates the scale washing operation of the water injection well.

Description

technical field [0001] The invention relates to the technical field of petroleum equipment, in particular to a scaling cleaning method for water injection wells. Background technique [0002] Now the oil field production has entered the fine production mode, especially the water flooding well. A lot of water injection adopts layered water injection, using divider and eccentric wellhead technology. The water injection wells are often affected by scaling and injector blockage, etc., which affect the water injection and test results. Conventional technology adopts water injection well operation technology to remove plugging, or uses large diameter coiled tubing technology. [0003] However, it is obvious that there are still some objective technical shortcomings in the traditional conventional operation methods of the above two methods: that is, conventional operation methods are generally used for plugging and descaling of water injection wells. Generally, in about two days,...

AI Technical Summary

Problems solved by technology

[0003] However, it is obvious that there are still some objective technical shortcomings in the traditional conventional operation methods of the above two methods: that is, conventional operation methods are generally used for plugging and descaling of water injection wells, and the disadvantages are as follows: (1) The operation time is long, which affects oil field production

Generally, in about two days, it is necessary to release the pressure of water well injection, which will affect the effect of water injection in the block

For oil layers in low-permeability oilfields, water wells are depressurized and water injection is stopped. It takes one month to achieve the original water injection effect after operation, which affects oilfield production.

(2), pollute the environment

(3), high cost

[0004] The traditional water injection well washing and scale removal technology has a long construction period, which often affects the normal water injection of the oil field

Especially for the cleaning of eccentric water injection wells, in the cleaning process of eccentric water injection wells (in order to improve water injection efficiency in oil field water injection, layered water injection technology is used, and eccentric water injection technology is often used in conventional wells. The schematic diagram is as follows figure 1 Shown: Layered water injection means that a packer is lowered into the water injection well to separate the oil layers with large differences, and then the water distribution device is used to distribute water in layers, so that the water injection volume of the high permeability layer is controlled, and the medium and low permeability oil layer water injection is strengthened, so that all kinds of oil layers can play a water injection method); obviously, the cleaning method in the prior art may cause damage to the packer and the eccentric water distributor (that is, the inner diameter of the eccentric water distributor is 46 mm) damage, resulting in a large cost of output

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