SU1493773A1 - Method of checking well cementing quality - Google Patents

Abstract

The invention relates to the field of well logging. The goal is to increase the reliability of the control. Geophysical sensors (D) are placed in the annular space (RF) of the well at a given depth. During the cementing process, the physical properties (C) of the substance in the RFP are measured over time and the measurement results are transmitted by cable to the surface. Record the pattern of C over time. After the end of cementing, the cement is lifted up to the beginning of the embedding of the cement. In the course of lifting D, the results of measurements of C in the salary congestion are recorded as a function of depth. The translation of the time diagram C into the diagram of the expected substance C as a function of the depth of the well. Compare the results of measurements of C, recorded during the rise of D, with the diagram of expected C. On the basis of the comparison, judge the nature of the filling of ZP with cement. As С, measured in RFP, the density of the drilling mud and cement mixture is recorded, which are in contact with D during the cementing process and during their lifting. 1 hp f-ly.

Description

The invention relates to well logging.

The purpose of the invention is to increase the reliability of the control.

The essence of the method lies in the fact that geophysical sensors are placed on the cable in the annular space to a predetermined depth before cementing begins. In the process of cementing

measuring the physical properties of a substance as a function of time and transmitting the measurement results over the ira cable to the surface where the time diagram is recorded. After the end of cementing, prior to the start of cement setting, the sensors raise and in the process of ascent, the results of measurements of the physical properties of the substance in the annular npocTpairci are recorded as a function of the well depth. Next, the measurement results are compared. In this case, knowing the volume of the pipelines in the test interval and the pumping rate of cement, the expected physical properties of the media in the annular space in the flow of the well are calculated, and the normal of the physical properties of the cement mortar. After that, the fact of comparison with the environment of 1.1, which is registered by geophysical sensors during their rise with the expected properties of the medium, is compared when the interval and coincidence of the factual and expected properties of the medium make a conclusion about the quality filling of the cement space of T1; When detecting siurpeiinn.x ikgoriya yu deviation djaKTHuecKiix CBOI ICTB environment from about; The results of incomplete displacement of the drill 1) are made by cement cement, the intervals of the forced drilling mud are determined and the prediction is made of the possibility of turning the mixture of drilling mud and cement into cement stone, and when OTKJioneiMiii is detected, it is actual and expected. properties of the environment in the annular space in the upper surface of the well, make a conclusion about the area of the drilling zone and the drilling and cement masonry and predict 11 1 intervals of a 101% quality of the other stone

Method Os1, Prt11l 1ut following way.

It produces ciiyoK bypass; but; (iolain is installed on the column and installed on the column, - After the production of the annular space into the tubular space (space; - o6ca; yoii KOHOHOHOI I and end;); for; (, a1P1 depth, a densitometer is lowered on the cable. Cementing is done. wells, during which a diagram is recorded of the density change pattern of the pulp; odii1, its flow of drilling mud and gement mixture at

After the end of cementing, the device on the cable extracts from the mash of the bio space and during the extraction process records the D5 pattern of the change in the density of the substance in the tubular annulus along the borehole.

Comparison of the results of measurements of the density of a substance in the annular space of a well over time with the inactive position of the densitometer and its movement along the wellbore as a function of the depth of the well,

It doesn’t give a BeinscTBa time plot of density in the annulus to a diagram of the expected density of a substance as a function of the depth of the well;

properties of the environment in the annulus with the expected and on the basis of this determine the intervals of the non-tested drilling mud, the size of the mixing zone of the drilling and cementitious muds and make a conclusion about the nature of the filling of the annulus with cement mortar. For carrying out the method, a serial densitometer can be used, based on measuring the change in the direct radiation of a gamma source in the geometry of a narrow beam.

1 about p and u inventions

Claims (2)

one . The method of cement quality control; 5 wells drilled, which includes different geophysical sensors in the annular space at a predetermined depth before cementing, measuring the physical properties of the substance in the annular space} in time during the cementing process and transmitting the results measure to the surface by cable, so that, in order to increase the reliability of the control, after the end of cementing, the sensors are lifted up before the cement sets, the process is continuously recorded The results of measurements of the physical properties of a substance in the annulus as a function of depth, translate time diagrams of the physical properties of a substance into the expected diagram: properties of a substance as a function of well depth, compare the results of measurements of the physical properties of a substance recorded during elevation of sensors to the results of the expected properties of a substance, on the basis of which the nature of filling the annulus with cement is judged 5-U937736 2. The method according to claim 1, which differs in the well space, is recorded by the fact that the density of the drilling visual properties of the substance in the annulus-mortar and cement mixture is given as quality.