Degradable temporary plugging ball and preparation method thereof

Abstract

The invention discloses a degradable temporary plugging wall and a preparation method thereof. The method comprises the following steps: esterifying and polymerizing water, terephthalic acid, ethylene glycol, 1,4-succinic acid, 1,3-propylene glycol and 1,4-hydroquinone; processing and grinding into balls in later phase to obtain a finished product. According to the degradable temporary plugging ball prepared by the preparation method provided by the invention, a blasthole can be plugged, working fluid is enforced to turn to other reforming layers, so that the degradable temporary plugging ball has the remarkable advantage of remarkable turning effect, and is easy to operate. After the construction is completed, the temperature of the stratum can be recovered, the temporary plugging wall is hydrolyzed into water-soluble acid and alcohol, and is drained with other fluids, so that the clean reformation of the stratum can be achieved, and longitudinal physical layering reformation can be realized, and the risk of ground flow plugging can be reduced. The degradable temporary plugging ball can be used in testing and completion stages.

Description

technical field [0001] The invention belongs to the technical field of oil testing engineering, and in particular relates to a degradable temporary plugging ball and a preparation method thereof. Background technique [0002] With the development of oil testing engineering technology, in the case of running a simple completion string, there is an increasing demand for simple and fast steering methods to achieve three-dimensional reconstruction. [0003] At present, the methods used to deal with complex reservoirs and strong heterogeneity in the vertical direction include: tool physical layering, fiber physical steering, plastic ball physical steering, and acid chemical steering to carry out vertical three-dimensional reconstruction. [0004] The advantage of tool physical delamination is accurate delamination, but there are problems such as only large-section (greater than 10m) delamination, complex tool string and subsequent operation difficulties; the advantage of fiber p...

AI Technical Summary

Problems solved by technology

[0004] The advantage of tool physical delamination is accurate delamination, but there are problems such as only large-section (greater than 10m) delamination, complex tool string and subsequent operation difficulties; the advantage of fiber physical diversion is that it can reduce the pressure difference of acid suction Reservoirs with 8MPa can be diverted and transformed, but there are disadvantages such as difficulty in realizing diversion in productive layers with a stress difference greater than 8MPa and complicated pumping process; physical diversion of plastic balls has the obvious advantages of blocking blastholes and diverting, but this plastic ball does not degrade , it is easy to block the process in the later stage of drainage; diverting acid chemical diversion can realize diversion transformation for reservoirs with acid suction pressure difference less than 5MPa, but it is difficult to realize diversion for productive layers with stress difference greater than 5MPa

Images