Due to the power failure, pipeline perforation, water pressure drop and other factors, heavy oil wells often appear blocked oil, casing (collectively known as the wellbore), resulting in normal production, unblocking unsuccessful lead to occur when the well. The scene of the general use of cement pump into the hot water around 50 ℃ wash well plugging. Due to the high viscosity and low fluidity of crude oil in heavy oil wells, cement trucks are often under pressure and flow because of the high pressure of cement trucks and large flow rate of flushing fluid during the cement truck washing process, resulting in frequent pressure concentration and destruction Wellhead seal, which was forced to terminate construction.
Under normal circumstances, the wellbore plugging heavy oil wells difficult to wash through the hot-washed cement truck wash well Jieduan success rate is very low, only about 30%. In addition, as cement truck wash wells need to pull the hot water tanker, coordination is difficult, the use of higher costs, become troubled site management and operation of a problem.
Cement truck wash operation, the main approach: after the cement truck pressure washes fluid from the casing into the tubing, pushing the flow of clogged heavy oil, through the tubing to the ground, thus lifting the blockage. Due to large flow of cement truck, high pressure, easy to produce stress concentration and damage the wellhead seal, so that construction is blocked.
Many years of experience in the field of cement truck washing wells show that heavy oil wells washing wells Jiegou slow work, the use of cement truck wash often want to speed up. In fact, lifting the plugging of heavy oil wells requires higher pressure, but does not require very high flow rates, or it is difficult to squeeze out the heavy oil in the wellbore. Only in high-pressure, low-flow operating conditions, washer fluid pumped slowly to the wellbore blocked heavy oil discharged to the ground pipeline.
On the basis of summing up the experience of pasting cement wells in the past, the technicians innovatively applied the J5-320 / 25.0 metering pump with adjustable flow rate to replace the cement pump into the well washing fluid and successfully lifted the heavy oil blockage in the wellbore to obtain A good wash well plugging effect. Application of metering pump flushing process connection, operation and cement truck wash well is basically the same, the difference is that the metering pump flow can be adjusted, the wellbore can slowly drain to the ground pipeline. This type of metering pump can be moved manually, loading and unloading convenient, easy to operate, the maximum working pressure of 25MPa, wash fluid flow rate can be arbitrarily adjusted within the range of 0 ~ 7.7 cubic meters / hour. As heavy oil wells have a water-mixing process, the hot water required for field washing wells can be tapped into the water pipelines. During the well flushing operation, the flushing fluid flow rate can be adjusted according to the blockage of the wellbore until the heavy oil in the wellbore is all discharged to the surface pipeline.
From the situation of well flushing and plugging in the field, no matter how high the viscosity of crude oil in heavy oil wells, how serious the blockage is, the heavy oil blockage in wellbore should be eliminated by using metering pump. If the ration of well flushing fluid is properly adjusted, Up to 100%. Up to now, the implementation of a total of 20 wells, washing well Jieduan success rate of 100%, made direct economic benefits of about 2000000 yuan.
The application of metering pumps to flush wells and solve plugging is more difficult to operate than the use of cement trucks and significantly reduces the flushing wells without the need of well washing equipment and personnel. The site is easy to implement and the cost of well washing has been greatly reduced. At the same time, it also greatly reduces the workload of shaft-repairing work and the loss of well-stopping production caused by the unblocking of wellbore and is by far the important operation innovation of well flushing and plugging in heavy oil wells.
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