A method of operating wells

 

(57) Abstract:

The invention relates to the oil industry and can find application in the operation of wells in the determination of violations of the casing wells, the definition of cross-flows. Provides simplified way and increase the reliability of detection of violations of the column, the annular space and cross-flows during operation. The inventive method are gamma-ray logging carry out control and gamma logs and comparing them with each other. As a radioisotope when gamma loggings use of radioactive elements in the rocks. When comparing gamma loggings combine the next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in the zones of the well. When determining violations of the casing above the fluid level in the borehole violation determined on dry land at the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, and the sources of water in SACLANT the difference between the values of gamma units 80-100% and lack of dynamics and abrupt change in the index of gamma logging. When determining violations of the casing below the liquid level in the well violation is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, the availability rate violations pick the difference between the values of gamma units 5-60%, lack of dynamics and abrupt change in the index of gamma logging interval cross-flows determine jointly with thermometry at the change of temperature anomalies and the storm thermorelay. The revealed violations of the repair. 2 S. p. f-crystals.

The invention relates to the oil industry and can find application in the operation of wells in the determination of violations of the casing wells, the definition of cross-flows, etc.

There is a method of well test for tightness, including gamma-ray injection into the well labeled soft shell, consisting of 3 sections: cleaning, flat and separating and defining intervals of leakage of the casing to increase the intensity of gamma-activity (patent RF № 2184843, CL E 21 In 47/00, publ. 2002.07.10).

The known method requires the use of special about the Noah columns and behind-the-casing flows.

The known method of monitoring the tightness of the annulus of the well, including gamma-ray logging, pumping cement slurry with radioisotopes, the control gamma loggings after the formation of the cement behind the casing and comparing them with each other to determine the beginning annular flow. As radioisotope use of long-lived chemically inert gaseous isotope with a monochromatic gamma rays, has no short-lived decay products - inert gas krypton - 85, the half-life of which is 10,71 year with monochromatic gamma rays with energies of 0.5 MeV in the absence of short-lived decay products (patent RF № 2171888, CL E 21 In 47/00, publ. 2001.08.10 - prototype).

The known method requires the use of long-lived radioisotope and mandatory injecting into the well annulus. The method allows to detect violations only in the penetration of cement slurry. The method is not suitable for determination of cross-flows around the wellbore. In the proposed invention solves the problem of simplifying operations and improving the reliability of detection of violations obsolesence is solved by the method of operation of the wells includes a gamma-ray logging, audit gamma loggings, comparing them with each other, the detection of violations and their repair. According to the invention in violation of the casing above the fluid level in the well as a radioisotope when gamma loggings use of radioactive elements in the rocks, when comparing gamma loggings combine the next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in the zones of the well, if this violation of the casing on dry land is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, and the sources of water in the annulus is determined by the end changes the same curve, the availability rate violations pick the difference between the values of gamma units 80-100% and lack of dynamics and abrupt change in the index of gamma logging.

According to another variant of the method of operation of the wells includes gamma logs, inspect the WMD option for violation of the casing below the liquid level in the well as a radioisotope when gamma loggings use of radioactive elements in the rocks, when comparing gamma loggings combine the next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in areas well, if this violation of the casing is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, the availability rate violations pick the difference between the values of gamma units 5-60%, lack of dynamics and abrupt change in the index of gamma logging, and the interval cross-flows determine jointly with thermometry at the change of temperature anomalies and the storm thermorelay.

Features of the invention are:

1. gamma logs;

2. the control gamma logging;

3. comparing them with each other;

4. the detection of violations and their repair;

5. the use of the radioisotope in the gamma ray log of radioactive elements in rocks;

6. the combination of mapping gamma loggings subsequent and previous curves of gamma-ASS="ptx2">

8. the adoption of the maximum difference between the values of gamma units per 100%;

9. definition of dynamics and % change of gamma units in the zones of the well.

10. determination of violations of the casing above the fluid level in the well on dry land at the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging and identification of sources of water in the annulus at the end changes the same curve, the availability rate violations pick the difference between the values of gamma units 80-100% and lack of dynamics and abrupt change in the index of gamma logging;

11. determination of violations of the casing below the liquid level in the well at the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, the availability rate violations pick the difference between the values of gamma units 5-60%, lack of dynamics and abrupt change in the index of gamma logging interval cross-flows determine jointly with thermometry at the change of temperature anomalies and the storm thermorelay.

Signs 1-4 are shared with the prototype p is etenia.

The invention

In the operation of the wells have discontinuity of the casing, damaging the integrity of the cement in the annular space and annular flows. These violations lead to the flooding of the produced oil, the flow of formation waters in aquifers that are useful for human life, weakening of the well design, abnormal working well. In the proposed method solves the problem of finding such violations. The problem is solved as follows.

During well operation performed gamma logging, control and gamma logging and comparing them with each other. As a radioisotope when gamma loggings use of radioactive elements in the rocks. Produced water washes away the radioactive elements in rocks (salt) and carrying them toward the producing wells. Radioactive elements in rocks accumulate in the near-wellbore zone, deposited on the tubes, they absorb clay. If the gamma-logging such deposits define and record. In the studied wells combine the next and previous curves of gamma logging, i.e., impose one curve to another. Normalize curves, i.e., establishing uniform scale and a single system of measurement (the curve. The maximum difference between the values of gamma units taken for 100%. Determine the dynamics and % change of gamma units in the zones of the well. Define the zones of change of the difference values of gamma logging notably, determine the length of time zones at depth and amplitude (the difference value).

When determining violations of the casing above the fluid level in the borehole violation determined on dry land at the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, and the sources of water in the annulus is determined by the end changes the same curve, the availability rate violations pick the difference between the values of gamma units 80-100%, lack of dynamics and abrupt change in the index of gamma logging.

When determining violations of the casing below the liquid level in the well violation is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, the availability rate violations pick the difference between the values of gamma units 5-60%, lack of dynamics and abrupt change in the index of gamma logging, olivani thermorelay.

Examples of specific performance

Example 1. During operation of the oil wells conduct gamma logs before operating and gamma logs 3 years after start of operation. Compare the curves of gamma logging to each other as follows: form the equation of a straight line on the control points Y=f(x) for a pair of curves of gamma logging, where the Y - values gamma-ray, x - depth of the well. Determine the coefficients (a, b) of formulas of the conversion curves of gamma logging to a single average curve Y=ax+b, i.e., establishing uniform scale and a single system of measurement range. Find the discrepancy between the calculated parameters Yand the measured Y indications of the re-measurement of gamma-ray y=Y-Y curve and build this difference.

For this well the range of divergence of gamma-units is 0.25-10 scales. The difference between the maximum and minimum value of gamma units when combining the curves of gamma-ray log for this well take over 100% (in particular, about 10 schemes).

Determine the dynamics and % change of gamma units in the zones of the well. Define the zones of change of the difference values of gamma logging notably, determine the length of time zones at depth and amplitude (in the distance of 290 metres from the wellhead mark an abrupt 90% (8 schemes) change the curve of the difference between the values of gamma units subsequent and previous curve gamma logging. The dynamics of violation no. Make a conclusion about the existence of a breach of the integrity of the casing in this place. As the geophone difference between the values of gamma units subsequent and previous curve of the gamma-ray log is kept within 80-100% (7-9 scales). At a depth of 380 m from the wellhead, the difference between the values of gamma units subsequent and previous curve gamma logging abruptly, without any change dynamics becomes equal to 10% (1 deck). Make a conclusion about the location of sources of water in the annulus. Apparently, at a depth of 380 m to the well rises the flow of produced water, rises in the annular space to a depth of 290 m and through the opening in the casing into the borehole. The path of movement of the stream of produced water lays radioactive elements in rocks (salt), which capture gamma-ray logging. During the further operation of the well repair cement stone at depths of 290-380 m and close up the hole at a depth of 290 m Gamma-ray logging, carried out after repair, showed no movement of formation water at these depths.

Example 2. Perform as example 1. At a distance of 1300 m from the wellhead say SC is Riva and gamma logging. The dynamics of violation no. Make a conclusion about the existence of a breach of the integrity of the casing in this place. During the further operation of the well repair casing in this place.

Example 3. Perform as example 1. At depths 1400-1440 m note the abrupt change in the curve of the difference between the values of gamma units subsequent and previous curve gamma logging. In this interval the change in the difference between the values of gamma units subsequent and previous curve of the gamma-ray log is from 5 to 60%. Make a conclusion about the annular flow in this interval. Spend thermometry well and in this interval sets the change of temperature anomalies and the storm thermorelay. During the further operation of the well repair cement stone in this place.

The application of the proposed method will simplify the operation and increase the reliability of detection of violations of the casing and the annular space of the borehole and cross-flows during well operation.

1. A method of operating a well comprising gamma-ray logging, audit gamma loggings, comparing them with each other, detection of violations is as radioisotope when gamma loggings use of radioactive elements in the rocks, when comparing gamma loggings combine the next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in areas well, if this violation of the casing on dry land is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curve gamma logging, and the sources of water in the annulus is determined by the end changes the same curve, for the indicator of the presence of disturbances choose the difference between the values of gamma units 80-100% and lack of dynamics and abrupt change in the index of gamma logging.

2. A method of operating a well comprising gamma-ray logging, audit gamma loggings, comparing them with each other, the detection of violations and their repair, characterized in that in case of infringement of the casing below the liquid level in the well as a radioisotope when gamma loggings use of radioactive elements in the rocks, when comparing gamma loggings combine the next and previous curves of gamma logging, STU values of gamma units take as 100%, determine the dynamics and % change of gamma units in areas well, if this violation of the casing is determined by the beginning of the change curve of the difference between the values of gamma units subsequent and previous curves of gamma logging, the availability rate violations pick the difference between the values of gamma units 5-60%, lack of dynamics and abrupt change in the index of gamma logging, and the interval cross-flows determine jointly with thermometry at the change of temperature anomalies and the storm thermorelay.

 

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FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

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