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Method for filling capsule anti-scaling particles for oil well
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An anti-scaling and capsule technology, which is applied in the field of oil and gas fields, can solve the problems of low utilization rate of chemicals, high labor intensity, and insufficient dosing.
Pending Publication Date: 2020-10-27
PETROCHINA CO LTD
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[0003] The purpose of the present invention is to provide a filling method of capsule anti-scaling particles for oil wells to solve the existing problems of insufficient dosing, high labor intensity and low utilization rate of medicaments
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Embodiment 1
[0029] A method for injecting capsule anti-scaling particles for oil wells, comprising the following steps:
[0030] The first step is to obtain the amount of anti-scaling particles injected with capsules at the bottom pocket of a single oil well in the production well at one time;
[0031] The second step is to prepare the capsule anti-scaling granule filling solution;
[0032] The third step is to inject the filling liquid of the capsule anti-scaling particles into the pocket at the bottom of the well;
[0033] The fourth step is to resume production after shutting down the well for a period of time.
Embodiment 2
[0035] On the basis of Example 1, before the first step, the production wells were also flushed. Clean the production well and clean the inside of the well to ensure that the dirt in the wellbore will not affect the subsequent injection of chemicals.
[0036] In the first step, the amount of capsule anti-scaling particles injected into the pocket at the bottom of a single oil well at one time is Q=V×ρ×a×10 3
[0037] Among them, Q—the mass of anti-scaling granules added to a capsule in one well, kg;
[0038] V—the pocket volume at the bottom of the oil well, m 3 ;
[0039] ρ——Packing density of capsule anti-scaling particles, g / cm 3 ;
[0040] a—dosing ratio, 75-85%;
[0041] For the calculation of the pocket volume at the bottom of the well, see the formula:
[0042]
[0043] where V——the volume of the wellbore bottom pocket of the oil well, m 3 ;
[0049] On the basis of Example 1, before the third step, a pad liquid is also prepared and injected into the well.
[0050] The pre-liquid configuration method is to add 30-40 kg of potassiumchloride and 10-20 kg of surfactant into the mixing tank, and then pour 1.5-2m 3 water, stir well.
[0051] Add 30-40 kg of potassiumchloride and 10-20 kg of surfactant into the mixing tank, then pour 1.5-2m 3 Water, mix potassiumchloride, surfactant and water evenly, and inject it into the well. The pre-fluid is injected through the oil well casing annulus by the injection pump. The pre-fluid can reduce the interfacial tension of oil and water, so that The oil-water separation can clean the oil on the pipe wall, prevent the capsule particles from adhering to the inner wall of the casing after being added, and reduce the use effect of the agent. At the same time, it can avoid the tools from being stuck and blocked inside the oil well. , to avoid reservoir water-sensitive characteristi...
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Abstract
The invention discloses a method for filling capsule anti-scaling particles for an oil well. The method comprises the following steps that 1, the amount of capsule anti-scaling particles filled once on site in a single oil wellsump hole of a production well is obtained; 2, capsule anti-scaling particle filling liquid is prepared; 3, the capsule anti-scaling particle filling liquid is injected into the sump hole; and 4, after the well is closed for a period of time, production is recovered. Enough capsule anti-scaling particles are accurately fed, the problems that traditional manual oil sleeve annulus feeding is not in place, and labor intensity of workers is high through injection equipment are solved, the wall of a wellhole is cleaned through prepad fluid, the situation that most of thecapsule anti-scaling particles adhere to the inner pipe wall and the outer pipe wall of an oil casing and cannot reach the position below a pump is avoided, and the problem that the effective utilization rate of the capsule anti-scaling particles is greatly reduced is solved.
Description
technical field [0001] The invention belongs to the field of oil and gas fields, and in particular relates to a filling method of capsule anti-scaling particles for oil wells. Background technique [0002] At present, for the scaling problem of oil wellwellbore at home and abroad, the oil casing ring is mainly air-dropped with chemical anti-scaling agent. Due to the influence of geographical topography in some oil fields, it is impossible to realize continuous injection of anti-scaling agent for each oil well by using a dosing device. Instead, it is manually poured from the oil casing annulus regularly and quantitatively. Due to the influence of well depth, gas pressure, downhole tools, etc., most of the chemical anti-fouling agent sticks to the inner and outer pipe walls of the oil casing and cannot reach the pump. Significantly reduce problems such as oil well shaft anti-scaling effect is not ideal. Moreover, the existing dosing methods are all aimed at liquid medicament...
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