CN111980691A - Measurement system for determining formation pressure using downhole hydrocarbon detection - Google Patents
Measurement system for determining formation pressure using downhole hydrocarbon detection Download PDFInfo
- Publication number
- CN111980691A CN111980691A CN202010911766.0A CN202010911766A CN111980691A CN 111980691 A CN111980691 A CN 111980691A CN 202010911766 A CN202010911766 A CN 202010911766A CN 111980691 A CN111980691 A CN 111980691A
- Authority
- CN
- China
- Prior art keywords
- bottom hole
- hole pressure
- shaft
- hydrocarbon
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 103
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 103
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 102
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title abstract description 7
- 238000005259 measurement Methods 0.000 title description 7
- 239000000126 substance Substances 0.000 claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims abstract description 51
- 238000005553 drilling Methods 0.000 claims description 13
- 238000009530 blood pressure measurement Methods 0.000 claims description 7
- 238000003556 assay Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention provides a measuring system for determining formation pressure by utilizing underground hydrocarbon detection, which comprises a shaft hydrocarbon substance concentration monitoring unit, a shaft bottom pressure control unit and a shaft bottom pressure measuring unit, wherein the monitoring unit judges whether a formation hydrocarbon substance enters a shaft and monitors the concentration of the hydrocarbon substance entering the shaft; the control unit receives the judgment result and the concentration monitoring result of the monitoring unit and adjusts the bottom hole pressure; the measuring unit can measure the bottom hole pressure in real time and feed back the measured result to the control unit, the control unit adjusts the bottom hole pressure until the monitoring unit detects that the concentration of the hydrocarbon substances in the stratum is more than 0% and not more than a%, and the bottom hole pressure measured by the measuring unit at the moment is the stratum pressure. The system can measure the formation pressure in real time, and the measured data has high accuracy.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling, and particularly relates to a measuring system for determining formation pressure by utilizing underground hydrocarbon detection.
Background
At present, the stratum pressure in the drilling process can be obtained only by a method of closing a well to obtain the pressure, but the stratum pressure obtained by the method has a large error and can be obtained only when the bottom hole pressure is smaller than the stratum pressure. Modern drilling has urgent need for accurately mastering the formation pressure, the accurate formation pressure is extremely important for the drilling safety, and particularly in the development process of high-temperature, high-pressure and high-sulfur oil and gas reservoirs, the accurate mastering of the formation pressure can be used as a first place in overflow discovery and treatment, so that accidents such as blowout and the like are avoided.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, it is an object of the present invention to provide a measurement system that can accurately determine the pressure in the formation being drilled.
In order to achieve the above object, the present invention provides a measurement system for determining formation pressure by using downhole hydrocarbon detection, the measurement system may include a wellbore hydrocarbon substance concentration monitoring unit, a bottom-hole pressure control unit and a bottom-hole pressure measurement unit, wherein the wellbore hydrocarbon substance concentration monitoring unit determines whether a formation hydrocarbon substance enters a wellbore and monitors the concentration of the hydrocarbon substance entering the wellbore; the bottom hole pressure control unit receives the judgment result and the concentration monitoring result of the shaft hydrocarbon substance concentration monitoring unit and adjusts the bottom hole pressure according to the judgment result and the concentration monitoring result; the bottom hole pressure measuring unit is connected with the bottom hole pressure control unit and can measure the bottom hole pressure in real time and feed back the measured result to the bottom hole pressure control unit, the bottom hole pressure control unit adjusts the bottom hole pressure until the shaft hydrocarbon substance concentration monitoring unit detects that the concentration of the formation hydrocarbon substance in the shaft is more than 0% and not more than a%, the bottom hole pressure control unit stops bottom hole pressure adjustment, the bottom hole pressure measuring unit measures the bottom hole pressure at the moment, namely the formation pressure, a represents a number, and a is more than 0 and less than 100, and no specific meaning exists.
Compared with the prior art, the invention has the beneficial effects that: the measuring system can measure the formation pressure in real time, has high accuracy of measured data, and can be used for oil and gas discovery and well control safety in the drilling process.
Detailed Description
In the following, an assay system for determining formation pressure using downhole hydrocarbon detection according to the present invention will be described in detail with reference to exemplary embodiments.
The present invention provides an assay system for determining formation pressure using downhole hydrocarbon testing. In one exemplary embodiment of the present assay system for determining formation pressure using downhole hydrocarbon detection, the assay system may include a wellbore hydrocarbon concentration monitoring unit, a bottom hole pressure control unit, and a bottom hole pressure measurement unit, wherein,
the shaft hydrocarbon substance concentration monitoring unit can monitor the formation hydrocarbon substance entering the shaft in the formation, judge whether the formation hydrocarbon substance enters the shaft or not, and feed back the monitoring result to the bottom hole pressure control unit.
The bottom hole pressure control unit can change the bottom hole pressure according to the monitoring result of the shaft hydrocarbon substance concentration monitoring unit. When the hydrocarbon substance concentration monitoring unit of the shaft monitors that the hydrocarbon substance of the stratum is in the shaft, the stratum pressure at the moment is larger than the bottom hole pressure, the bottom hole pressure can be gradually increased through the bottom hole pressure control unit, and the bottom hole pressure is larger than the stratum pressure so that the hydrocarbon substance of the stratum is not in the shaft. If the bottom hole pressure adjusted by the bottom hole pressure control unit is too great, the bottom hole pressure can be gradually reduced in the subsequent adjusting process. And when the bottom hole pressure control unit adjusts the bottom hole pressure until the hydrocarbon substance concentration monitoring unit of the shaft detects that the hydrocarbon substance concentration of the stratum in the shaft is more than 0% and not more than a%, the bottom hole pressure control unit stops adjusting the bottom hole pressure, and the bottom hole pressure measured by the bottom hole pressure measuring unit is the stratum pressure. The bottom hole pressure control unit can gradually increase or decrease according to the concentration of the formation hydrocarbon substances in the well bore so that the concentration of the formation hydrocarbon substances in the well bore is more than 0% and not more than a% (a% can also be called a calibration base value concentration of the well bore hydrocarbon substance concentration monitoring unit). Wherein a represents a number and 0 < a < 100, without particular meaning, for example a is 0.1 or a is 99.9 or a is 40, the value of a differing depending on the hydrocarbon material.
The bottom hole pressure measuring unit can measure the bottom hole pressure in real time. The bottom hole pressure can be measured before the bottom hole pressure control unit adjusts the bottom hole pressure or during the bottom hole pressure adjusting process of the pressure control unit and after the bottom hole pressure adjusting process, and the measured bottom hole pressure is fed back to the bottom hole pressure control unit.
In this embodiment, the wellbore pressure control unit varies the pressure at the bottom of the well to a hydrocarbon concentration in the formation greater than 0% and not greater than a%, and the measurement system can make the following adjustments:
when the hydrocarbon substance concentration monitoring unit of the shaft monitors that the hydrocarbon substance of the stratum exists in the shaft, the bottom hole pressure measuring unit measures the bottom hole pressure at the moment to be P1；
The bottom hole pressure control unit adjusts the bottom hole pressure, and when the hydrocarbon substance concentration monitoring unit of the shaft does not monitor that the hydrocarbon substance of the stratum exists in the shaft, the bottom hole pressure measuring unit measures the bottom hole pressure at the moment as P2；
The bottom hole pressure control unit continues to adjust the bottom hole pressure to P3In which P is1＜P3＜P2The shaft hydrocarbon substance concentration monitoring unit detects whether the concentration of the formation hydrocarbon substance in the shaft is more than 0% and not more than a%, if so, the bottom hole pressure P3The formation pressure is obtained, if not, the shaft hydrocarbon substance concentration monitoring unit monitors whether hydrocarbon substances exist in the shaft,
when the bottom hole pressure is adjusted to P3Then, if the hydrocarbon substances in the stratum exist in the shaft, the bottom hole pressure is less than the stratum pressure, and the bottom hole pressure control unit can gradually increase the bottom hole pressure P3Every time the bottom hole pressure is increased, the hydrocarbon substance concentration monitoring unit of the shaft monitors the hydrocarbon substance in the shaft to determine whether the hydrocarbon substance concentration of the stratum in the shaft is more than 0% and not more than a%, and the hydrocarbon substance concentration is gradually increased to PmWhen the hydrocarbon substance concentration monitoring unit of the shaft detects that the hydrocarbon substance concentration of the stratum in the shaft is more than 0% and not more than a%, the bottom hole pressure at the moment is recorded, and the bottom hole pressure P at the momentmI.e. the formation pressure, wherein m represents a number and m is more than or equal to 4, has no specific meaning, and the bottom hole pressure increased each time can be equal or unequal.
When the bottom hole pressure is adjusted to P3Then, if no stratum hydrocarbon exists in the shaft, the bottom hole pressure is larger than the stratum pressure, and the bottom hole pressure control unit gradually reduces the bottom hole pressure P3Every time the bottom hole pressure is reduced, the hydrocarbon substance concentration monitoring unit of the shaft hole monitors the hydrocarbon substance in the shaft hole to determine whether the hydrocarbon substance concentration monitoring unit meets the requirements of the formation hydrocarbon substances in the shaft holeThe concentration of the substance is more than 0% and not more than a%, and is gradually reduced to
At the moment, the hydrocarbon substance concentration monitoring unit of the shaft detects that the hydrocarbon substance concentration of the stratum in the shaft is more than 0% and not more than a%, and the stratum pressure is the stratum pressure
Wherein n represents a number and n is more than or equal to 4, no specific meaning exists, and the bottom hole pressure reduced each time can be equal or unequal.
In this embodiment, the bottom hole pressure P3Is P3＝(P1+P2)/2. The P ismIs composed of
Wherein P ism-1＜Pm＜P2，Pm-1Indicating that the bottom hole pressure is adjusted to PmThe previously adjusted bottom hole pressure. In the present embodiment, the
Is composed of
Wherein
Indicating that the bottom hole pressure is adjusted to
The previously adjusted bottom hole pressure.
Above, e.g. the bottom hole pressure P3Can be P3＝(P1+P2) At the time of bottom hole pressure P3Checking the hydrocarbon material in the shaft as the approximate value of the stratum pressure, if the concentration of the hydrocarbon material in the stratum in the shaft is more than 0 percentAnd not more than a%, the bottom hole pressure P3Is the formation pressure. If the concentration of the hydrocarbon substances in the stratum in the shaft is not more than 0 percent and not more than a percent, the shaft pressure control unit continues to adjust the bottom hole pressure, the shaft hydrocarbon substance concentration monitoring unit monitors whether the hydrocarbon substances exist in the shaft or not,
if the hydrocarbon substance concentration monitoring unit of the shaft monitors that the hydrocarbon substance of the stratum exists in the shaft, the hydrocarbon substance concentration monitoring unit of the shaft indicates the bottom hole pressure P3Less than the formation pressure, the wellbore pressure control unit adjusting the bottom hole pressure to P4＝(P3+P2) Monitoring the hydrocarbon concentration of the stratum in the well bore, and if the hydrocarbon concentration of the stratum in the well bore is more than 0% and not more than a%, then the bottom hole pressure P4Is the formation pressure; if the concentration of the hydrocarbon substances in the stratum in the shaft is not more than 0% and not more than a%, continuously increasing the pressure in the shaft to P by using the shaft pressure control unit5＝(P4+P2) And/2, similarly, determining whether the hydrocarbon concentration of the stratum in the shaft is more than 0% and not more than a% by using a hydrocarbon concentration monitoring unit of the stratum in the shaft, and if so, determining the bottom hole pressure P5If the formation pressure is not satisfied, the bottom hole pressure control unit continues to sequentially increase the bottom hole pressure to P6、P7… up to PmIn which P ism-1＜Pm＜P2M represents a number and m.gtoreq.8, with no specific meaning, Pm-1Indicating that the bottom hole pressure is adjusted to PmThe bottom hole pressure of the previous adjustment when the bottom hole pressure is PmThe concentration of the hydrocarbon substances in the stratum in the shaft is more than 0 percent and not more than a percent, and the bottom hole pressure P is obtained at the momentmNamely the formation pressure;
if the hydrocarbon concentration monitoring unit of the shaft cannot monitor the existence of the stratum hydrocarbon in the shaft, the surface bottom hole pressure P3Above the formation pressure, the wellbore pressure control unit reduces the bottom hole pressure to
Monitoring the hydrocarbon concentration of the stratum in the shaft, and if the hydrocarbon concentration of the stratum in the shaft is more than 0% and not more than a%, determining the bottom hole pressure
Is the formation pressure; if the concentration of the hydrocarbon substances in the stratum in the shaft is not more than 0% and not more than a%, continuously reducing the pressure in the shaft to the value of more than 0% and not more than a% by using the shaft pressure control unit
And similarly, monitoring the concentration of the stratum hydrocarbon substance in the shaft to judge whether the concentration of the stratum hydrocarbon substance in the shaft is more than 0% and not more than a%, if so, determining the bottom hole pressure
If the formation pressure is not satisfied, the bottom hole pressure control unit continuously and gradually reduces the bottom hole pressure to
Wherein
n represents a number and n.gtoreq.6, with no specific meaning,
indicating that the bottom hole pressure is adjusted to
The bottom hole pressure is adjusted until the concentration of the hydrocarbon substances in the stratum in the shaft is more than 0% and not more than a%, and the bottom hole pressure is adjusted at the moment
I.e., the formation pressure.
In this embodiment, the bottom hole pressure measurement unit may comprise a bottom hole pressure measurement while drilling device. The bottom hole pressure can be measured by a bottom hole pressure measuring device while drilling.
In this embodiment, the measurement system may measure formation pressure during drilling while drilling.
In conclusion, the measuring system can measure the formation pressure in real time, has high accuracy of measured data, and can be used for oil and gas discovery and well control safety in the drilling process.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An assay system for determining formation pressure using downhole hydrocarbon testing, the assay system comprising a wellbore hydrocarbon concentration monitoring unit, a bottom hole pressure control unit, and a bottom hole pressure measurement unit, wherein,
the wellbore hydrocarbon substance concentration monitoring unit can judge whether a stratum hydrocarbon substance enters a wellbore or not and monitor the concentration of the stratum hydrocarbon substance in the wellbore in real time;
the bottom hole pressure control unit receives the judgment result and the concentration monitoring result of the shaft hydrocarbon substance concentration monitoring unit and adjusts the bottom hole pressure according to the judgment result and the concentration monitoring result;
the bottom hole pressure measuring unit is connected with the bottom hole pressure control unit and can measure the bottom hole pressure in real time and feed back the measured result to the bottom hole pressure control unit, the bottom hole pressure control unit adjusts the bottom hole pressure until the shaft hydrocarbon substance concentration monitoring unit detects that the concentration of the formation hydrocarbon substance in the shaft is more than 0% and not more than a%, the bottom hole pressure control unit stops bottom hole pressure adjustment, the bottom hole pressure measuring unit measures the bottom hole pressure at the moment, namely the formation pressure, a represents a number, and a is more than 0 and less than 100, and no specific meaning exists.
2. The system of claim 1, wherein the bottom hole pressure control unit adjusts the bottom hole pressure until the wellbore hydrocarbon concentration monitoring unit detects a concentration of formation hydrocarbons in the wellbore greater than 0% and not greater than a% comprises:
the hydrocarbon substance concentration monitoring unit of the shaft monitors that the hydrocarbon substance of the stratum exists in the shaft, and the bottom hole pressure measuring unit measures the bottom hole pressure P at the moment1；
The bottom hole pressure control unit adjusts the bottom hole pressure until the hydrocarbon substance concentration monitoring unit of the shaft monitors that no formation hydrocarbon substance exists in the shaft, and the bottom hole pressure measuring unit measures the bottom hole pressure at the moment to be P2；
The bottom hole pressure control unit continues to adjust the bottom hole pressure to P3In which P is1＜P3＜P2The shaft hydrocarbon substance concentration monitoring unit detects whether the concentration of the formation hydrocarbon substance in the shaft is more than 0% and not more than a%, if so, the bottom hole pressure P3The pressure is the formation pressure, if not, the shaft hydrocarbon substance concentration monitoring unit monitors whether hydrocarbon substances exist in the shaft,
if present, the bottom hole pressure control unit successively increases the bottom hole pressure P3To PmMonitoring the shaft hydrocarbon substances after increasing the bottom hole pressure each time until the shaft hydrocarbon substance concentration monitoring unit detects that the concentration of the stratum hydrocarbon substances in the shaft is more than 0% and not more than a%, wherein the stratum pressure is PmWherein P ism＜P2M represents a number and m.gtoreq.4, with no specific meaning,
if not, the bottom hole pressure control unit reduces the bottom hole pressure P successively3To
Monitoring the shaft hydrocarbon substances after the bottom hole pressure is reduced each time until the shaft hydrocarbon substance concentration monitoring unit detects that the concentration of the stratum hydrocarbon substances in the shaft is more than 0% and not more than a%, wherein the stratum pressure is
Wherein
n represents a number and n.gtoreq.4,there is no specific meaning.
3. The system of claim 2, wherein the bottom hole pressure P is measured by a downhole hydrocarbon sensor3Is P3＝(P1+P2)/2；
The P ismIs composed of
Wherein P ism-1＜Pm＜P2，Pm-1Indicating that the bottom hole pressure is adjusted to PmThe bottom hole pressure of the previous adjustment;
the above-mentioned
Is composed of
Wherein
Indicating that the bottom hole pressure is adjusted to
The previously adjusted bottom hole pressure.
4. The system of claim 1, wherein the bottom hole pressure measurement unit comprises a bottom hole pressure measurement while drilling device.
5. The system of claim 1, wherein the system determines formation pressure during drilling while drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010911766.0A CN111980691A (en) | 2020-09-03 | 2020-09-03 | Measurement system for determining formation pressure using downhole hydrocarbon detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010911766.0A CN111980691A (en) | 2020-09-03 | 2020-09-03 | Measurement system for determining formation pressure using downhole hydrocarbon detection |
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| CN111980691A true CN111980691A (en) | 2020-11-24 |
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| CN202010911766.0A Pending CN111980691A (en) | 2020-09-03 | 2020-09-03 | Measurement system for determining formation pressure using downhole hydrocarbon detection |
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Cited By (1)
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2020
- 2020-09-03 CN CN202010911766.0A patent/CN111980691A/en active Pending
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