Pressure control drilling parameter real-time optimization method and device based on measured data and readable storage medium
By fitting and adjusting the calculation formula based on measured data, the wellhead back pressure and drilling fluid density are adjusted in real time. This solves the problem of mismatch between parameter optimization and actual needs in controlled pressure drilling in fractured and lost circulation formations, and achieves rapid and accurate parameter adjustment, thereby improving adjustment efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2026-03-10
AI Technical Summary
When encountering fractured and leaky formations, existing controlled pressure drilling methods fail to match the optimized parameters with actual needs, resulting in low adjustment efficiency and difficulty in quickly adapting to the current working conditions.
Based on measured data, the adjustment calculation formula is fitted to adjust the wellhead back pressure and drilling fluid density in real time, and the parameters are optimized by the cumulative flow difference data under dynamic operating conditions.
It enables rapid and accurate parameter optimization and adjustment, improving the adaptability and efficiency of parameter adjustment.
Smart Images
Figure CN121630248A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of oilfield drilling fluid, and in particular to a fracture leakage formation managed pressure drilling parameter real-time optimization method, device and readable storage medium based on measured data. BACKGROUND
[0002] Managed pressure drilling is an advanced technology to solve the drilling problem of "narrow safety window" formation, which can accurately measure outlet flow and quickly adjust wellhead back pressure. With the in-depth exploration and development of difficult-to-produce oil and gas resources, the application demand of this technology is more and more.
[0003] When drilling through a fractured leakage formation, the managed pressure drilling system has strong real-time and adaptability compared with the conventional drilling technology which can only adjust the drilling fluid density due to its accurate outlet flow measurement and rapid wellhead back pressure adjustment. However, the key parameter design of the existing managed pressure drilling when drilling through a fractured leakage formation is an optimized design based on the data obtained by conventional drilling, and lacks a real-time adjustment method for managed pressure drilling, so that when adjusting, multiple adjustments are needed, and the adjustment parameters suitable for the current condition cannot be quickly obtained, the adjustment adaptability is poor, and the adjustment efficiency is low. Therefore, it becomes a technical problem to be solved by those skilled in the art to study a managed pressure drilling parameter real-time optimization method based on the measured data of managed pressure drilling to improve the parameter adjustment efficiency and adaptability of managed pressure drilling when drilling through a fractured leakage formation.
[0004] Therefore, the prior art still needs to be improved. SUMMARY
[0005] To solve the above technical problems, the embodiments of the present application propose a fracture leakage formation managed pressure drilling parameter real-time optimization method, device and readable storage medium based on measured data to solve the technical problems of the existing technology that the parameter optimization of the fracture leakage formation managed pressure drilling does not match the actual demand and the low adjustment efficiency.
[0006] To solve the above technical problems, some embodiments of the present application disclose a fracture leakage formation managed pressure drilling parameter real-time optimization method based on measured data, comprising: Fitting to obtain an adjustment calculation formula based on the cumulative flow difference data in unit time corresponding to different displacements and different back pressures under dynamic working conditions; Obtaining key data under different working conditions in the managed pressure drilling process, and real-time adjusting the wellhead back pressure and / or the drilling fluid density based on the key data and the adjustment calculation formula.
[0007] In some embodiments, fitting to obtain an adjustment calculation formula based on the cumulative flow difference data in unit time corresponding to different displacements and different back pressures under dynamic working conditions comprises: Under the dynamic normal drilling or circulating discharge condition, the wellhead back pressure is gradually increased to be stable in multiple unit time periods, and recorded as a first wellhead back pressure value; the difference between the well inlet discharge and the wellhead return flow is measured in multiple unit time periods, and recorded as a first cumulative flow difference; Under the dynamic pump loss condition, the wellhead back pressure is gradually increased to be stable in multiple unit time periods, and recorded as a second wellhead back pressure value; the difference between the well inlet discharge and the wellhead return flow is measured in multiple unit time periods, and recorded as a second cumulative flow difference; The adjustment calculation formula is fitted based on the first wellhead back pressure value, the first cumulative flow difference, the second wellhead back pressure value and the second cumulative flow difference.
[0008] In some embodiments, the key data includes the difference between the well inlet discharge and the wellhead return flow in the current unit time period.
[0009] In some embodiments, the real-time adjustment of the wellhead back pressure and / or the drilling fluid density based on the key data and the adjustment calculation formula includes: Under the dynamic condition, if the difference between the well inlet discharge and the wellhead return flow in the current unit time period is negative, the current wellhead back pressure value is increased; if the difference between the well inlet discharge and the wellhead return flow in the current unit time period is less than the allowable loss amount, the current wellhead back pressure value is maintained; if the difference between the well inlet discharge and the wellhead return flow in the current unit time period is greater than the allowable loss amount, the current wellhead back pressure value is decreased.
[0010] In some embodiments, under the dynamic condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid column pressure, the annular circulating pressure loss and the wellhead back pressure.
[0011] In some embodiments, it further includes: under the static condition, gradually reducing the pump loss, reducing the discharge, until the pump is stopped, recording the wellhead back pressure as a third wellhead back pressure value, and determining the relationship between the current bottom hole pressure and the formation pressure based on the change of the unit time period third wellhead back pressure value.
[0012] In some embodiments, under the static condition, if the unit time period third wellhead back pressure value increases, the current bottom hole pressure is less than the formation pressure, and if the unit time period third wellhead back pressure value decreases, the current bottom hole pressure is greater than the formation pressure.
[0013] In some embodiments, under the static condition, if the unit time period third wellhead back pressure value is still stable, it is determined that the current bottom hole pressure is reasonable.
[0014] In some embodiments, under the static condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid column pressure and the wellhead back pressure.
[0015] In some embodiments, it further includes: After the wellhead back pressure and / or the drilling fluid density are adjusted in real time based on the key data and the adjustment calculation formula, drilling is performed to a predetermined distance, and then the steps of acquiring the key data under different working conditions in the managed pressure drilling process and adjusting the wellhead back pressure and / or the drilling fluid density in real time based on the key data and the adjustment calculation formula are repeated until drilling is completed.
[0016] The embodiment of the present application also provides a computer device, comprising a processor, an input device, an output device and a memory, which are connected with each other, wherein the memory is used for storing a computer program, the computer program comprises program instructions, and the processor is configured to invoke the program instructions to execute the real-time optimization method for the fracture leakage formation managed pressure drilling parameters based on the measured data.
[0017] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, the computer program comprises program instructions, and the program instructions make the processor execute the real-time optimization method for the fracture leakage formation managed pressure drilling parameters based on the measured data when the processor executes the program instructions.
[0018] By adopting the technical scheme, the present application has at least the following beneficial effects: The real-time optimization method for the fracture leakage formation managed pressure drilling parameters based on the measured data provided by the present application can obtain the cumulative flow difference data in unit time corresponding to different discharge and different back pressure under the dynamic working condition, and fit the managed pressure adjustment calculation formula suitable for the fracture leakage formation, so that the parameter optimization adjustment can be realized quickly and accurately when the parameters of the leakage formation under the dynamic working condition are adjusted, and the adjustment accuracy is high and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0020] Figure 1 A flowchart of a real-time optimization method for fracture leakage formation managed pressure drilling parameters based on measured data disclosed by some embodiments of the present application; Figure 2 A flowchart of a real-time optimization method for fracture leakage formation managed pressure drilling parameters based on measured data disclosed by some embodiments of the present application. DETAILED DESCRIPTION
[0021] The embodiments of the present disclosure will be described in further detail below with reference to the drawings and examples. The following detailed description of the examples and the accompanying drawings are provided for the purpose of illustrating the principles of the present disclosure, and are not intended to limit the scope of the present disclosure, which can be embodied in a variety of different forms, not limited to the specific examples disclosed herein, but include all technical solutions falling within the scope of the claims.
[0022] The present disclosure provides these examples in order to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specified, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these examples should be interpreted as merely exemplary, and not as a limitation.
[0023] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0024] In addition, "first", "second", and similar words used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.
[0025] It should also be noted that, in the description of the present disclosure, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between a first device and a second device, there can be an intermediate device between the specific device and the first device or the second device, or there can be no intermediate device.
[0026] All terms used herein are intended to have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It will also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0027] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.
[0028] As shown in Figure 1 Some embodiments of the present application disclose a real-time optimization method for controlling drilling parameters in a fractured leakage formation based on measured data, comprising: obtaining a regulation calculation formula based on the cumulative flow difference data in unit time corresponding to different discharge and different back pressure under dynamic working conditions; obtaining key data under different working conditions during the controlled pressure drilling process, and real-time adjusting the wellhead back pressure and / or the drilling fluid density based on the key data and the regulation calculation formula. In this embodiment, after the adjustment is completed, the key parameters are generally obtained repeatedly after drilling for a designed distance, and based on the reobtained key data, the required wellhead back pressure and drilling fluid density values are obtained according to the regulation calculation formula, and then the wellhead back pressure and / or the drilling fluid density are adjusted in real time before continuing to drill. The drilling distance each time can be selected empirically according to the formation conditions. Since this embodiment uses the real-time obtained key data under different working conditions during the controlled pressure drilling process, rather than being controlled based on assumptions or models, the adaptability of the parameter adjustment during the drilling process in the leakage bottom layer is strong, and the adjustment efficiency is improved.
[0029] The real-time optimization method for controlling drilling parameters in a fractured leakage formation based on measured data disclosed by some embodiments of the present application, on the basis of the above-mentioned embodiments, for obtaining a regulation calculation formula, and based on the cumulative flow difference data in unit time corresponding to different discharge and different back pressure under dynamic working conditions, the regulation calculation formula can be fitted to include: Under the condition of dynamic normal drilling or circulating discharge, the wellhead back pressure is gradually increased to be stable in a plurality of unit time periods, and recorded as a first wellhead back pressure value; the difference between the in-hole discharge and the wellhead return flow in a plurality of unit time periods is measured and recorded as a first cumulative flow difference; Under the condition of dynamic pump leakage, the wellhead back pressure is gradually increased to be stable in a plurality of unit time periods, and recorded as a second wellhead back pressure value; the difference between the in-hole discharge and the wellhead return flow in a plurality of unit time periods is measured and recorded as a second cumulative flow difference; Then, based on a plurality of the first wellhead back pressure values, the first cumulative flow difference, the second wellhead back pressure values and the second cumulative flow difference obtained in a plurality of time periods, a regulation calculation formula is fitted.
[0030] The key data can include: the difference between the inflow rate and the wellhead return flow rate in a current unit period, that is, the cumulative difference between the inflow rate and the wellhead return flow rate after the wellhead back pressure is adjusted to be stable, and the whole regulation is based on the cumulative difference, so that fewer real-time parameters need to be obtained, the speed is faster, and the adjustment efficiency can be effectively improved.
[0031] The real-time adjustment of the wellhead back pressure and / or the drilling fluid density based on the key data and the adjustment calculation formula can include: Under the dynamic working condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid pressure column pressure, the annular circulation pressure loss and the wellhead back pressure. If the difference between the inflow rate and the wellhead return flow rate in a current unit period is a negative value, the current wellhead back pressure value is increased; if the difference between the inflow rate and the wellhead return flow rate in a current unit period is less than the allowable loss amount, the current wellhead back pressure value is maintained; and if the difference between the inflow rate and the wellhead return flow rate in a current unit period is greater than the allowable loss amount, the current wellhead back pressure value is reduced.
[0032] Some embodiments of the present application disclose a real-time optimization method for fracture leakage bottom layer managed pressure drilling parameters based on measured data. Under the static working condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid pressure column pressure and the wellhead back pressure. The pump stroke is gradually reduced, the displacement is reduced, and the pump is stopped until the wellhead back pressure is recorded as a third wellhead back pressure value. The relationship between the current bottom hole pressure and the formation pressure is determined based on the change of the third wellhead back pressure value in a unit period. If the third wellhead back pressure value in a unit period increases, the current bottom hole pressure is less than the formation pressure, and if the third wellhead back pressure value in a unit period decreases, the current bottom hole pressure is greater than the formation pressure. If the third wellhead back pressure in a unit time period is still stable, it is determined that the current bottom hole pressure is reasonable.
[0033] As shown in Figure 2 Some embodiments of the present application disclose a real-time optimization method for fracture leakage bottom layer managed pressure drilling parameters based on measured data, which includes: Firstly, the key data of different working conditions in the process of managed pressure drilling is obtained; Dynamic working condition measurement; Drilling or circulation measurement. Under the normal drilling or circulation displacement q condition, the wellhead back pressure P1 is gradually increased and stabilized, the difference AQ1 between the inflow rate and the wellhead return flow rate in a T1 period is measured, and the wellhead back pressure P1 and the cumulative flow difference, that is, the AQ=T1* AQ1 data, are recorded.
[0034] Low pump stroke loss measurement. Under the condition of low pump stroke and small displacement, the wellhead back pressure P2 is gradually increased and stabilized, the difference AQ2 between the inflow rate and the wellhead return flow rate in a T2 period is measured, and the wellhead back pressure P2 and the cumulative flow difference, that is, the AQ=T2* AQ2 data, are recorded.
[0035] Static working condition measurement; Pump stop and pressure build-up measurement. Gradually reduce pump stroke, reduce displacement, until the pump is stopped, control the wellhead back pressure to P3, measure the change of back pressure value P3 in T3 period; if P3 increases, the current well bottom pressure Pw is less than the formation pressure Pf; if P3 decreases, the current well bottom pressure Pw is greater than the formation pressure Pf.
[0036] According to the data of different working conditions in the process of pressure control drilling, the wellhead back pressure and the drilling fluid density are adjusted in real time. Dynamic drilling working condition measurement, if ΔQ is less than the allowable loss amount ΔQloss, the current back pressure is P; if ΔQ is greater than the allowable loss amount ΔQloss, the current back pressure P should be reduced; if ΔQ is negative, the current back pressure P should be increased.
[0037] Static drilling working condition measurement, if P3 increases, T3 period exceeds the safe back pressure value Ps, the drilling fluid density needs to be increased; if P3 decreases, P3 can be reduced to stable in T3 period, the circulating pressure loss and the back pressure control range need to be analyzed to determine whether to reduce the drilling fluid density; if P3 decreases, T3 period continues to decrease, the drilling fluid density needs to be reduced; Secondly, the well bottom pressure corresponding to the back pressure control range is the well bottom pressure when the allowable loss amount ΔQloss is reached. Generally, the well bottom pressure relationship of real-time adjustment of wellhead back pressure and drilling fluid density is: Dynamic drilling working condition, well bottom pressure = drilling fluid static column pressure Ps + annular circulating pressure loss Pcl + wellhead back pressure Pad.
[0038] Static drilling working condition, well bottom pressure = drilling fluid static column pressure Ps + wellhead back pressure Pas.
[0039] Wellhead back pressure Pad is less than safe back pressure value Ps, and wellhead back pressure Pas is less than safe back pressure value Ps.
[0040] Thirdly, in dynamic drilling working condition and static drilling working condition, the fracture leakage formation is used for plugging while drilling, and the wellhead back pressure and the drilling fluid density are adjusted in real time.
[0041] As a preferred embodiment of the present application, in order to achieve the purpose of the present application, the present application also provides a computer device, comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory are connected with each other, wherein the memory is used for storing a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the steps of the real-time optimization method based on the measured data and the fracture leakage bottom layer pressure control drilling parameters of the preceding embodiments.
[0042] As another preferred embodiment of the present application, the present application also provides a computer readable storage medium, which stores a computer program, the computer program comprising program instructions, the program instructions causing a processor to execute the real-time optimization method based on measured data and fracture leakage bottom layer control pressure drilling parameters of the foregoing embodiments when executed by the processor.
[0043] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.
[0044] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.
Claims
1. A method for real-time optimization of parameters of managed pressure drilling in a lost circulation formation based on measured data, characterized in that, The method comprises the following steps: Fitting a regulation calculation formula based on the cumulative flow difference data in unit time corresponding to different displacements and different back pressures under dynamic working conditions; Obtaining key data under different working conditions in the process of managed pressure drilling, and adjusting the wellhead back pressure and / or the drilling fluid density in real time based on the key data and the regulation calculation formula.
2. The real-time optimization method of the fracture leakage formation pressure control drilling parameters based on the measured data according to claim 1, characterized in that: Fitting a regulation calculation formula based on the cumulative flow difference data in unit time corresponding to different displacements and different back pressures under dynamic working conditions comprises: Under the condition of dynamic normal drilling or circulating displacement, gradually increasing the wellhead back pressure to stability in multiple unit time periods, and recording the first wellhead back pressure value; measuring the difference between the in-hole displacement and the wellhead return flow in multiple unit time periods, and recording the first cumulative flow difference; Under the condition of dynamic leakage pumping, gradually increasing the wellhead back pressure to stability in multiple unit time periods, and recording the second wellhead back pressure value; measuring the difference between the in-hole displacement and the wellhead return flow in multiple unit time periods, and recording the second cumulative flow difference; Fitting a regulation calculation formula based on the first wellhead back pressure value, the first cumulative flow difference, the second wellhead back pressure value and the second cumulative flow difference.
3. The method of claim 1, wherein, The key data comprises the difference between the in-hole displacement and the wellhead return flow in the current unit time period.
4. The method according to claim 3, wherein, Adjusting the wellhead back pressure and / or the drilling fluid density in real time based on the key data and the regulation calculation formula comprises: Under the dynamic working condition, if the difference between the in-hole displacement and the wellhead return flow in the current unit time period is negative, the current wellhead back pressure value is increased; if the difference between the in-hole displacement and the wellhead return flow in the current unit time period is less than the allowable leakage amount, the current wellhead back pressure value is maintained; if the difference between the in-hole displacement and the wellhead return flow in the current unit time period is greater than the allowable leakage amount, the current wellhead back pressure value is decreased.
5. The method according to claim 4, wherein, Under the dynamic working condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid column pressure, the annular circulation pressure loss and the wellhead back pressure.
6. The method of real-time optimization of MPD and fracture loss base layer managed pressure drilling parameters based on measured data according to claim 1, characterized in that, Further comprising: Under the static working condition, gradually reducing the pumping, reducing the displacement, until the pump is stopped, recording the wellhead back pressure as the third wellhead back pressure value, and judging the relationship between the current bottom hole pressure and the formation pressure based on the change of the unit time period third wellhead back pressure value.
7. The method according to claim 6, wherein, Under the static working condition, if the unit time period third wellhead back pressure value increases, the current bottom hole pressure is less than the formation pressure, and if the unit time period third wellhead back pressure value decreases, the current bottom hole pressure is greater than the formation pressure.
8. The method according to claim 6, wherein, Under the static working condition, if the unit time period third wellhead back pressure value is still stable, it is judged that the current bottom hole pressure is reasonable.
9. The method of claim 6, wherein, Under the static working condition, the bottom hole pressure is equal to the sum of the drilling fluid static liquid column pressure and the wellhead back pressure.
10. The method of claim 1, wherein, Further comprising: After adjusting the wellhead back pressure and / or the drilling fluid density in real time based on the key data and the regulation calculation formula, drilling a predetermined distance, and then repeating the steps of obtaining the key data under different working conditions in the process of managed pressure drilling, and adjusting the wellhead back pressure and / or the drilling fluid density in real time based on the key data and the regulation calculation formula until the drilling is completed.
11. A computer device, comprising: The computer readable storage medium stores a computer program, and the computer program includes program instructions. The program instructions, when executed by a processor, cause the processor to execute the real-time optimization method for fracture leakage bottom layer managed pressure drilling parameters based on measured data according to any one of claims 1-10.
12. A computer-readable storage medium, characterized in that: The computer readable storage medium stores a computer program, and the computer program includes program instructions. The program instructions, when executed by a processor, cause the processor to execute the real-time optimization method for fracture leakage bottom layer managed pressure drilling parameters based on measured data according to any one of claims 1-10.