A kind of profile control method of unmoved pipe string for injection well
A technology for separating injection wells and moving pipes, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as prolonging construction time, increasing workload, and spitting back plugging agents into the wellbore, reducing work Quantity, saving construction time, and avoiding the effect of blocking agent back spitting
Active Publication Date: 2016-12-28
PETROCHINA CO LTD
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Problems solved by technology
During this process, the pipe string is lifted and lowered four times, the workload is heavy, the operation cost is high, and the construction time is long
In addition, the pressure of the water well must be relieved before the pipe string is lifted, which prolongs the construction time and increases the workload
After the profile control is completed, it is very easy to cause the plugging agent to vomit into the wellbore due to pressure relief, which affects the profile control effect.
Method used
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Embodiment Construction
[0016] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0017] see figure 1 , is a structural schematic diagram of a water injection string in a separate injection well provided by the embodiment of the present invention. Before the profile control construction, all the water nozzles 3 on the eccentric water distributor 2 are picked up, which is the profile control string of the separate injection well. see figure 2 . Inject 30 cubic meters of clean water from oil pipe 1, and then inject high-viscosity temporary plugging agent from oil pipe 1; Temporarily block the space between the tubing 1 and the annulus 5 of the oil jacket to prevent subsequent plugging agents from settling therein. Then, inject gel particles, inorganic gel, and weak gel as plugging agents sequentially from oil pipe 1; the total amount of gel particles, inorganic gel, and weak gel is calculated by V=πR 2...
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The invention relates to a profile control method for an immobile string of an injection well. The method comprises the following steps: firstly fishing up the water faucet of the injection well and injecting clear water and a high-viscosity temporary plugging agent into a pit shaft for preprocessing the pit shaft; then sequentially injecting gel particles, inorganic gel and weak gel into an oil pipe to perform the profile control and controlling the sizes of the diameters of the gel particles to guarantee that the gel particles can pass through the water faucet; and finally adopting a high-efficiency gel breaker to wash the pit shaft to reduce the viscosity of the high-viscosity temporary plugging agent, back washing the high-viscosity temporary plugging agent out of the pit shaft, and completing the profile control operation for the immobile string of the injection well. The method is easy to operate, time-saving and labor-saving.
Description
technical field [0001] The invention relates to the field of oil production engineering, in particular to a method for profile control of a separate injection well without moving a pipe string. Background technique [0002] At present, during the profile control operation of separate injection wells in oilfields, the separate injection string of the original well must be pulled out first, and then the profile control string is lowered. After the profile control is completed, the profile control string is pulled out, and then the separate injection string is lowered for separate injection. During this process, the pipe string is lifted and lowered four times, and the workload is large, the operation cost is high, and the construction time is long. And the water well must be depressurized before the pipe string is lifted, which prolongs the construction time and increases the workload. After the profile control is completed, it is very easy to cause the plugging agent to regu...
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IPC IPC(8): E21B43/22
Inventor 雒继忠史成恩李亮马立军令永刚王明瑜寇卫伟王玉罡高超君吴春生
Owner PETROCHINA CO LTD