SU1362818A1 - Method of matching logging data to well depth - Google Patents

Abstract

The invention relates to well geophysical and geochemical well surveying. The purpose of the invention is to increase accuracy. A label is introduced into the flushing fluid stream. Record the passage of the entered mark on the bottomhole on the geochemical parameter diagram. Record the moment of exit of the mark from the well on the geochemical parameter diagram. The recorded data is used as a reference point when coordinating the depth of the geophysical and geochemical well survey data. The flow rate of the washing liquid is measured. The lag time of the gavonefteprophases on the surface from the moment of their formation at the bottom is determined. Subsequently, the depths of the gas and oil deposits are determined. A solid or liquid reagent is used as a substance introduced into the washing liquid stream and forming a label, which passes into a gas phase or evolving gas upon contact with a liquid during chemical reaction with a liquid. When raising the slurry fluid through the annulus, the gas label that expands is fixed and fixed at the wellhead. Such a gas bubble has clear boundaries and is determined by the simplest resistive sensors. 1 3.p. f-ly, 2 il, i (L with O5 -o 00

Description

The invention relates to field geophysical and geochemical well studies in the drilling process, in particular to the questions of linking the data of these studies to the depth of the well.

The aim of the invention is to improve the accuracy.

Fig. 1 is a schematic of a device for carrying out the method; figure 2 - plot of registration marks on the charts of geophysical (plot B) and geochemical (plot C) parameters.

The device contains a tank 1 with flushing fluid, a tank 2 with a reagent, a valve 3 for entering the reagent, a drilling pump 4, a pressure pipe 5, a column 6, a well log recorder 7 of geophysical parameters, a sensor 8 for passing the bottomhole, a sensor 9 for passing the label at the wellhead , the recorder 10 geochemical parameters, the chute 11 drain flushing fluid.

Figure 2 shows the entry points of tag A, the mark of its progress through the bottomhole on the geophysical parameter B chart of the downhole tool and the mark passing mark through the wellhead on the geochemical parameter chart B. Interval between the marks on chart B and C is considered as the time lag t and as basic benchmarks for anchoring diagrams B & B to depth.

The method is carried out as follows.

From the tank 1, the flushing fluid is pumped by the drilling pump 4 into the pipeline 5, and from there into the drill string 6. At the signal of the operator, the valve 3 is opened and the tank 2 enters the flushing fluid in a fraction of the reagent. The reagent in the form of a powder or a liquid passes the pump 4 and during the Descent with the washing liquid along the drill string 6 forms a gas bubble tag. Passing the sensor 8 placed in the bottomhole, it causes a sharp short-term increase in resistance between its electrodes (not shown), which forms a mark on the geophysical parameters chart of the borehole recorder 7. Raising the flushing fluid to the surface, the gas mark expands (due to a drop in pressure ) and

A sensor 9 is recorded at the mouth, then a second mark is formed on the geochemical parameters chart by the recorder 10.

In the geophysical and geochemical parameters diagrams, these labels (B and C) are separated by an interval of time t — the lag time determined by the time of movement of a portion of flushing fluid with a label from bottom to wellhead, and true depths, using reference points obtained in the diagrams geophysical and geochemical diagrams of the reservoir being drilled.

A solid or liquid reagent is used as a substance introduced into the flow of washing liquid and forming a label (passing through sensors 8 and 9 later used as a bench mark). When lifting The emulsion of the flushing fluid expands over the annulus and the gas mark expands and is fixed at the wellhead. Such a gas bubble in the washing liquid has clear boundaries; its presence in the washing liquid

liquids are easily detected by the simplest resistive sensor or level sensor of the washing liquid, which makes it possible to increase the accuracy of determining the moment of fixation of the mark and the reference to

tons of logs obtained during logging diagrams. During the passage through the open chute and during the period when the flushing fluid is in the tank, the tag gas escapes into the atmosphere, which ensures the stability of the flushing fluid composition and the possibility of repeated use of the tag.

Claims (2)

1. The method of linking logging data to the depth of the well, consisting in introducing a tag into the flushing fluid flow and fixing the output its from the well on the geochemical parameter chart, measuring the flow rate of flushing fluid, determining the gas-oil lag time on the surface from the moment of their formation in the bottomhole and the subsequent determination of the depth of gas and oil deposits, characterized in that, in order to increase the accuracy, the passage of the entered mark is fixed on 3 bottom hole on the diagram of the geophysical parameter, which is used as a reference point when negotiating the depth of the geophysical and geochemical well data, 2. The method of pop. 1, I differ from the fact that as a The substances introduced into the flushing liquid and forming a label use a solid or liquid reagent, which, upon contact and liquid, transfers into the gas phase or evolves gas during a chemical reaction with the liquid. - -. fe.1 6 Editor N. Gorvat Compiled by A. Rybakov Tehred L. Serdyukova Proofreader A .T sko Order 6351/21 Circulation 533 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4  2