Calculation method for shaft sand filling amount on the basis of compaction function

Abstract

The invention discloses a calculation method for shaft sand filling amount on the basis of a compaction function, and belongs to the field of the oil-water well sand filling technology. The calculation method is based on the following factors: the leakage of a shaft is less than or equal to 5m<3> / h, and shaft overflowing is not in the presence; the compaction function is a main factor which influences the sand filling amount; and the internal pressure gradient of a sand filling section is equivalent to lithostatic pressure gradient. The method comprises the following steps that: setting the upper boundary and the lower boundary of the sand filling section in the shaft as h1 and h2, and setting depth between any interface of the upper boundary and the lower boundary and ground as h; and calculating the intensity of pressure of the sand filling section on the h1, and calculating the corresponding equivalent depth h1* of the sand filling section on the h1 so as to determine the equivalent depth h* of the sand filling section on the h to determine the porosity of the sand filling section on the h under a compression state so as to determine corresponding volume when the depth of the sand filling section in the shaft under the compression state is determined as h, and therefore, through the above parameters, carrying out calculation to obtain the volume, i.e., the sand filling amount, of the sand filling section from h1 to h2 under a state of the loose ground. By use of the method disclosed by the invention, the one-time success rate of sand filling construction is improved.

Description

technical field [0001] The invention relates to the field of sand filling technology for oil and water wells, in particular to a method for calculating the amount of wellbore sand filling based on compaction. Background technique [0002] During the development of oil field construction wells, petroleum engineering sand is usually added to the wellbore to seal the bottom oil layer or leakage point, so as to achieve the purpose of sealing off the oil and water layers. Generally, in the prior art, the required wellbore sand filling amount is obtained through the following calculation formula: [0003] [0004] Among them, D is the inner diameter of the casing (mm), H is the thickness of sand filling (mm), and Q is the required amount of sand filling (m 3 ). [0005] However, the inventor found that the theoretical sand filling amount obtained by using the calculation method provided by the prior art is often lower than the actual sand filling amount, which will cause subs...

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Problems solved by technology

[0008] 3) Loss factors: During the sand filling process, the sand particles will more or less adhere to the inner pipe wall of the wellbore, which will also cause a small loss of sand particles

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