Ultrasonic imaging well measuring method

Abstract

The invention discloses an ultrasonic imaging well measuring method. A rotating probe is connected with an energy converter. The rotating probe drives the energy converter to rotate. In the rotating process of the energy converter, one ultrasonic pulse signal is stimulated to scan an oil well to be measured at 360 degrees, and thus the ultrasonic pulse signal can be broadcast in fluid of the oil well to be measured and merged into the inner wall of a casing pipe of the oil well; the ultrasonic wave train reflected from the external interface and the internal interface of the casing pipe is measured, information of the inner diameter of the casing pipe is obtained according to echo time of the received ultrasonic wave train, the thickness information of the inner wall of the casing pipe isobtained according to the resonance wave frequency of the casing pipe, and acoustic impedance information of ring space is obtained according to the resonance wave head wave scope. By means of one-time well going, quality of cement bonding and the casing pipe is evaluated, the measure period is shortened, and the operation cost is reduced. Accurate judgment can be made to solid phase cement, liquid phase water, uncemented microgaps and gas, and the phase state of the ring space can be known more intuitively. The inner diameter, the outer diameter, the wall thickness and the corrosion situationof the casing pipe can be recognized, and quantitative judgment is made for the corrosion situation of the casing pipe.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of petroleum well logging, in particular to an ultrasonic imaging logging method. Background technique [0002] At present, in the middle and late stages of oilfield development, due to the long-term effects of anisotropy of formation stress, artificial water injection, and chemical corrosion of liquid inside and outside the well, the damage, deformation, and corrosion of oil and water well casings have become increasingly prominent. Therefore, casing damage detection plays an important role in stabilizing and increasing oil and gas production. The casing wall thickness information can be well detected by the ultrasonic pulse reflection method, and the cementing quality can be accurately evaluated at the same time. [0003] In traditional technical schemes, CBL and VDL are the main methods of cementing quality evaluation, among them, CBL (cement bond logging) cement bond logging, V...

AI Technical Summary

Problems solved by technology

Conventional logging technology uses the acoustic amplitude variable density method to perform multi-sector cement cementation logging technology to evaluate cementing quality and cementation; use electromagnetic method and multi-arm mechanical method to evaluate casing wall thickness and inner diameter, which requires multiple downhole measurements , the cycle is long, the operation cost is high, and it is impossible to measure the cement bond and casing quality at the same time in one downhole

Images