CN109736772B - Simple pressure control drilling method and system based on annular return monitoring - Google Patents
Simple pressure control drilling method and system based on annular return monitoring Download PDFInfo
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Abstract
A simple pressure-control drilling system based on annulus return monitoring comprises a shaft, a drill column, a density sensor, a flow sensor, an industrial control computer, a pressure sensor, an automatic throttle valve, an injection pipeline, an annulus return pipeline and a mud tank, wherein the industrial control computer is used for pressure-control drilling annulus pressure analysis and control software; one end of an injection pipeline is communicated with the upper end of a drill column, the other end of the injection pipeline is inserted into the slurry tank, the bottom end of the drill column is inserted into the shaft, one end of an annular return pipeline is connected with an outlet at the upper end of the shaft, and the other end of the annular return pipeline is inserted into the slurry tank; the density sensor, the flow sensor, the pressure sensor and the automatic throttle valve are arranged in sequence along the annular return pipeline, and the signal output ends of the density sensor, the flow sensor, the pressure sensor and the automatic throttle valve are all connected with the signal input end of the industrial control computer. The system has simple structure and convenient operation, can accurately control the annular pressure profile in the drilling process, and avoids or reduces the underground leakage or overflow condition.
Description
Technical Field
The invention relates to the technical field of drilling of petroleum drilling engineering, in particular to a simple pressure-controlled drilling method and system based on annular return monitoring.
Background
In recent years, along with the increasing expansion of the exploration and development scale of petroleum and natural gas, more and more layers with narrow density windows are complex, the phenomena of well leakage and overflow can occur carelessly in the drilling process, even the phenomena of well leakage and overflow exist simultaneously, and the underground construction safety and the construction efficiency are seriously influenced. Therefore, the real-time accurate control is carried out on the annular pressure in the drilling process, and the method has important practical significance for improving the drilling construction safety and the construction efficiency of the stratum with the narrow density window.
In recent years, pressure control drilling systems have been developed by many petroleum units, but most of them have large volume and high manufacturing cost, and are not convenient for large-scale popularization and application.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a simple pressure control drilling system and a simple pressure control drilling method based on annular return monitoring, and aims to accurately control an annular pressure profile in the drilling process in real time and avoid or reduce the underground leakage or overflow condition.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a simple pressure control drilling system based on annular return monitoring comprises a shaft, a drill string, a first automatic flat valve, a second automatic flat valve, a third automatic flat valve, a density sensor, a flow sensor, an industrial control computer for pressure control drilling annular pressure analysis and control software, a pressure sensor, an automatic throttle valve, an injection pipeline, an annular return pipeline and a mud tank, wherein the shaft is arranged in the shaft; one end of the injection pipeline is communicated with the upper end of the drill column, the other end of the injection pipeline is inserted into the slurry tank, the bottom end of the drill column is inserted into the shaft, one end of the annular space return pipeline is connected with an outlet at the upper end of the shaft, and the other end of the annular space return pipeline is inserted into the slurry tank; the density sensor, the flow sensor, the pressure sensor and the automatic throttling valve are sequentially arranged along an annular return pipeline, signal output ends of the density sensor, the flow sensor, the pressure sensor and the automatic throttling valve are all connected with a signal input end of an industrial control computer, and signal input ends of the first automatic flat valve, the second automatic flat valve, the third automatic flat valve and the automatic throttling valve are connected with a signal output end of the industrial control computer.
In the simple pressure-control drilling system based on the annular return monitoring, the density sensor is connected with the first automatic flat valve, the second automatic flat valve and the third automatic flat valve through pipelines and then connected to the annular return pipeline.
In the simple pressure-control drilling system based on the annular return monitoring, a mud pump and an automatic throttle valve are respectively connected to the drilling circulating injection pipeline and the drilling circulating annular return pipeline.
A simple pressure control drilling method based on annular return monitoring comprises the following steps:
s1, establishing a simple pressure control drilling system based on annular return monitoring;
s2, in the process of secondary-start and later-start drilling, m depth points are selected from the open hole section, the serial number of the depth points is represented by i, and the vertical depth is represented by D i In the representation, i =1 \8230m, m is set with points D with different depths i Pore pressure P of pi Different depth D i At a fracture pressure P fi Drilling fluid density is rho d Actual drilling depthD, the actual drilling circulation discharge capacity is Q, and the circulation discharge capacity test standard point is Q ij The drill bit is at D i Standard point Q of each cycle displacement test in depth ij Corresponding PWD bottom hole pressure value is P pij At different depth points D i At position Q i1 →Q i2 →....Q ij Respectively circulating the displacements, wherein the maximum displacement does not exceed the allowable maximum drilling circulating displacement, j is a numerical value of the displacement, and recording the corresponding PWD bottom hole pressure value P under each circulating displacement pi1 →P pi2 →....P pij ；
S3, aiming at the technical casing, calculating the positions of the drill bits at different depth points D through an industrial control computer i At different cyclic displacements Q ij The values of the bottom hole pressure, the depth point and the circulating displacement during circulation are the same as those in the step S2, and each circulating displacement standard point Q is set ij Lower corresponding bottom hole pressure value P cij According to Q i1 →Q i2 →....Q ij Respectively circulating the discharge volumes, wherein j is the numerical value of the discharge volume, and recording the corresponding bottom hole pressure value P under each circulation discharge volume ci1 →P ci2 →....P cij ；
S4, when the bottom hole pressure is calculated, the well hole is assumed to be a regular smooth well hole, and the influence of an actual irregular well hole and roughness is eliminated, so that a software model needs to be corrected, and the corresponding annulus flow pressure drop correction coefficients under different displacement of different depth points i are calculated: (P) pi1 -P pi-1,1 -0.00981*ρ d *D i )/(P ci1 -P ci-1,1 -0.00981*ρ d *D i )→(P pi2 -P pi-1,2 -0.00981*ρ d *D i )/(P ci2 -P ci-1,2 -0.00981*ρ d *D i )→....(P pij -P pi-1,j -0.00981*ρ d *D i )/(P cij -P ci-1,j -0.00981*ρ d *D i ) In which P is p0,1 ,P p0,2 ....P p0,j Measured pressure at different displacement at the well head, P c0,1 ,P c0, 2 ....P c0,j For calculated pressures at different displacements at the wellhead, byAt the well head as depth zero point, so P p0,1 ,P p0,2 ....P p0,j ，P c0,1 ,P c0,2 ....P c0,j Are all equal to 0;
s5, making a correction coefficient chart, drawing an annular flow pressure drop correction coefficient curve under different displacement conditions of different depth points, and drawing a correction coefficient curve for the condition that the actual drilling depth D and the actual circulation displacement Q are different from the drilling depth D i And a cyclic displacement Q ij When the pressure is in a standard point, an annular flow pressure drop correction coefficient is obtained by adopting a Lagrange linear interpolation mode, and the converted pressure correction coefficient is input into an industrial control computer;
s6, in the drilling construction process, when the pressure monitored by the pressure sensor is lower than the rated pressure bearing capacity of the density sensor, the first automatic flat valve and the third automatic flat valve are opened through the industrial control computer, the second automatic flat valve is closed, and the initial opening state of the automatic throttle valve is 50%; when the pressure monitored by the pressure sensor is higher than the rated pressure bearing capacity of the density sensor, the industrial control computer controls to open the second automatic flat valve and close the first automatic flat valve and the third automatic flat valve, and the initial opening state of the automatic throttle valve is 50%;
s7, starting a mud pump to circulate, and setting an annular return monitoring flow Q i Density ρ i Pressure P i Current depth D i Bottom hole pressure of P di (ii) a Annulus return monitoring flow Q monitored by system i Density rho i Pressure P i Directly entering an industrial control computer for calculation and analysis to obtain the current depth D i Bottom hole pressure P di At the same time as the depth point D i Pore pressure P of pi And the loss pressure P fi Comparing;
if P pi <P di <P fi The system only carries out monitoring processing;
if P pi >P di The system will control the automatic throttle valve to reduce the opening until P pi <P di Until the end;
if P di >P fi The system controls the automatic throttle valve to increase the opening until P di <P fi Until now.
In the invention, in the step S2, the value of the depth point i comprises the depth of an upper casing shoe and the bottom of a well, and the value of the depth point i of the casing shoe is 1.
The beneficial effects of the invention are: the invention can accurately control the annular pressure profile in the drilling process in real time, avoid or reduce the condition of underground leakage or overflow, and has the advantages of simple system structure, convenient operation and convenient popularization.
Drawings
FIG. 1 is a schematic diagram of a simple pressure-controlled drilling system based on annular return monitoring according to the present invention;
FIG. 2 is a plot of an annular flow pressure drop correction factor according to the present invention;
in the figure: 1-shaft, 2-drill string, 3-first automatic flat valve, 4-density sensor, 5-second automatic flat valve, 6-third automatic flat valve, 7-flow sensor, 8-industrial control computer, 9-pressure sensor, 10-automatic throttle valve, 11-injection pipeline, 12-annular return pipeline, 13-slurry pump and 14-slurry tank.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The simple pressure-control drilling system based on the annular back-out monitoring shown in fig. 1 comprises a shaft 1, a drill string 2, a first automatic flat valve 3, a second automatic flat valve 5, a third automatic flat valve 6, a density sensor 4, a flow sensor 7, an industrial control computer 8 for analyzing and controlling annular pressure during pressure-control drilling, a pressure sensor 9, an automatic throttle valve 10, an injection pipeline 11, an annular back-out pipeline 12 and a mud tank 14; one end of the injection pipeline 11 is communicated with the upper end of the drill string 2, the other end of the injection pipeline is inserted into the mud tank 14, the bottom end of the drill string 2 is inserted into the shaft 1, one end of the annular space return pipeline 12 is connected with an outlet at the upper end of the shaft 1, and the other end of the annular space return pipeline is inserted into the mud tank 14; the density sensor 4, the flow sensor 7, the pressure sensor 9 and the automatic throttling valve 10 are sequentially arranged along an annular return pipeline 12, signal output ends of the density sensor 4, the flow sensor 7, the pressure sensor 9 and the automatic throttling valve 10 are all connected with a signal input end of an industrial control computer 8, and signal input ends of the first automatic flat valve 3, the second automatic flat valve 5, the third automatic flat valve 6 and the automatic throttling valve 10 are connected with a signal output end of the industrial control computer 8.
Further, the density sensor 4 is connected with the first automatic flat valve 3, the second automatic flat valve 5 and the third automatic flat valve 6 through pipelines and then is connected to an annular return pipeline 12.
Furthermore, a mud pump 13 and an automatic throttle valve 10 are respectively connected to the drilling circulation injection pipeline 11 and the drilling circulation annulus return pipeline 12.
A simple pressure control drilling method based on annular return monitoring comprises the following steps:
s1, establishing a simple pressure control drilling system based on annular return monitoring;
s2, in the process of secondary-start and later-start drilling, m depth points are selected from the open hole section, the serial number of the depth points is represented by i, and the vertical depth is represented by D i I =1 \ 8230a, m. Setting different depth points D i Pore pressure P of pi Different depth D i At a fracture pressure P fi Drilling fluid density is rho d D is the actual drilling depth, Q is the actual drilling circulation discharge capacity, and Q is the circulation discharge capacity test standard point ij The drill bit is in D i Standard point Q of each cycle displacement test in depth ij Corresponding PWD bottom hole pressure value is P pij At different depth points D i At, press Q i1 →Q i2 →....Q ij Respectively circulating the displacements, wherein the maximum displacement does not exceed the allowable maximum drilling circulating displacement, j is a numerical value of the displacement, and recording the corresponding PWD bottom hole pressure value P under each circulating displacement pi1 →P pi2 →....P pij ；
S3, aiming at the technical casing, calculating the positions of the drill bits at different depth points D through the industrial control computer 8 i At different cyclic displacements Q ij The values of the bottom hole pressure, the depth point and the circulating discharge capacity during circulation are the same as those in the step S2, and each circulating discharge capacity test standard point Q is set ij Lower corresponding bottom hole pressure value P cij Press Q i1 →Q i2 →....Q ij Respectively circulating the discharge volumes, wherein j is the numerical value of the discharge volume, and recording the corresponding bottom hole pressure value P under each circulation discharge volume ci1 →P ci2 →....P cij ；
S4, when the bottom hole pressure is calculated, the well hole is assumed to be a regular smooth well hole, and the influence of an actual irregular well hole and roughness is eliminated, so that a software model needs to be corrected, and the corresponding annulus flow pressure drop correction coefficients under different displacement of different depth points i are calculated: (P) pi1 -P pi-1,1 -0.00981*ρ d *D i )/(P ci1 -P ci-1,1 -0.00981*ρ d *D i )→(P pi2 -P pi-1,2 -0.00981*ρ d *D i )/(P ci2 -P ci-1,2 -0.00981*ρ d *D i )→....(P pij -P pi-1,j -0.00981*ρ d *D i )/(P cij -P ci-1,j -0.00981*ρ d *D i ). Wherein P is p0,1 ,P p0,2 ....P p0,j Is the actual measurement pressure P at different discharge capacities at the well head c0,1 ,P c0, 2 ....P c0,j For the calculated pressure at different displacements at the well head, P is the depth zero point because the well head is p0,1 ,P p0,2 ....P p0,j ，P c0,1 ,P c0,2 ....P c0,j Are all equal to 0;
s5, making a correction coefficient chart, drawing an annular flow pressure drop correction coefficient curve under different displacement conditions of different depth points, and making the actual drilling depth D and the actual circulation displacement Q different from the drilling depth D i And a cyclic displacement Q ij When standard points are used, a Lagrange linear interpolation mode is adopted to obtain an annular flow pressure drop correction coefficient, the converted pressure correction coefficient is input into the industrial control computer 8, and the method is convenient to obtain the quasi-pressure when the bottom hole pressure under different depth points and different discharge capacities is subsequently calculatedDetermining an annulus flow pressure drop correction factor;
s6, in the drilling construction process, when the pressure monitored by the pressure sensor 9 is lower than the rated pressure-bearing capacity of the density sensor 4, the first automatic flat valve 3 and the third automatic flat valve 6 are opened through the industrial control computer 8, the second automatic flat valve 5 is closed, and the initial opening state of the automatic throttle valve 10 is 50%; when the pressure monitored by the pressure sensor 9 is higher than the rated pressure-bearing capacity of the density sensor 4, the industrial control computer 8 controls to open the second automatic flat valve 5 and close the first automatic flat valve 3 and the third automatic flat valve 6, and the initial opening state of the automatic throttle valve 10 is 50%;
s7, starting the mud pump 13 to start circulation, and setting an annular space to return to monitor flow Q i Density rho i Pressure P i Current depth D i Bottom hole pressure P di (ii) a Annular return monitoring flow Q monitored by system i Density rho i Pressure P i Directly enters an industrial control computer 8 for calculation and analysis to obtain the current depth D i Bottom hole pressure P di Simultaneously with the depth point D i Pore pressure P of pi And the loss pressure P fi Comparing;
if P pi <P di <P fi The system only carries out monitoring processing;
if P pi >P di The system will control the automatic throttle valve 10 to decrease the opening until P pi <P di Until the end;
if P di >P fi The system will control the automatic throttle valve 10 to increase the opening until P di <P fi Until now.
Further, in the step S2, the value of the depth point i includes the depth of the upper casing shoe and the bottom of the well, the value of the depth point i includes the depth of the upper casing shoe, the value of the depth point i of the casing shoe is 1, and the denser value of the depth point is more beneficial to the calculation of the annular pressure; the PWD pressure tester is arranged near the drill bit, and the testing pressure is the annular bottom-hole pressure at the depth of the drill bit.
Before normal drilling construction, the following preparation needs to be made: one end of an injection pipeline 11 is communicated with the upper end of a drill string 2, the other end of the injection pipeline is inserted into a mud tank 14, the bottom end of the drill string 2 is inserted into the shaft 1, one end of an annular return pipeline 12 is connected with an outlet at the upper end of the shaft 1, and the other end of the annular return pipeline is inserted into the mud tank 14; the density sensor 4, the flow sensor 7, the pressure sensor 9 and the automatic throttle valve 10 are all arranged on an annular return pipeline 12, signal output ends of the density sensor 4, the flow sensor 7, the pressure sensor 9 and the automatic throttle valve 10 are all connected with a signal input end of an industrial control computer 8, and signal input ends of the first automatic flat valve 3, the second automatic flat valve 5, the third automatic flat valve 6 and the automatic throttle valve 10 are connected with a signal output end of the industrial control computer 8. The density sensor 4 is connected with the first automatic flat valve 3, the second automatic flat valve 5 and the third automatic flat valve 6 through pipelines and then is connected to an annular return pipeline 12.
The mud pump 13 pumps the mud into the shaft 1 through the injection pipeline 11, and returns to the mud tank 14 through the annular return pipeline 12, and at this time, the density sensor 4, the flow sensor 7, the pressure sensor 9 and the automatic throttle valve 10 respectively transmit the density signal, the flow signal, the pressure signal and the throttle valve opening signal of the mud in the injection pipeline 11 to the industrial control computer 8.
Further, pressure-controlled drilling annular pressure analysis and control software is installed on the industrial control computer 8 and used for calculating bottom hole pressure values when the drill bit position circulates at different depth points at different circulation discharge capacities.
The following illustrates the principles of the invention in connection with an example:
s1, establishing a simple pressure control drilling system based on annular return monitoring;
s2, the lower depth 1050m of a casing pipe of a certain well of the land oil field is obtained, in the process of drilling for two times, 3 depth points are selected from an open hole section for simple and convenient calculation, and the vertical depths are D 1 ＝1050m、D 2 ＝1100m、D 3 =1150m, pore pressure P at different depth points p1 ＝11.12MPa、P p2 ＝11.65MPa、P p3 =12.18MPa, burst pressure P at different depth points f1 ＝14.42MPa、P f2 ＝15.11MPa、P f3 =15.79MPa and drilling fluid density rho d ＝1.14g/cm 3 The standard point of the circulating discharge capacity is Q ij =10, 15, 20, 25, 30L/s, drill bit at D 1 、D 2 、D 3 Standard point of displacement per cycle Q at depth ij Corresponding PWD bottom hole pressure value P pij As shown in table 1;
TABLE 1 downhole pressure test data sheet at different depth points
S3, aiming at the technical casing, calculating the positions of the drill bits at different depth points D through the industrial control computer 8 1 ＝1050m、D 2 ＝1100m、D 3 =1150m position different circulation displacement Q ij The bottom hole pressure values when the circulation is carried out by =10, 15, 20, 25 and 30L/s, and the calculation data is shown in table 2;
TABLE 2 downhole pressure calculation data table at different depth points
S4, during calculation of bottom hole pressure, the well hole is assumed to be a regular smooth well hole, and the influence of an actual irregular well hole and roughness is not considered, so that a software model needs to be corrected, and different depth points D are calculated 1 ＝1050m、D 2 ＝1100m、D 3 =1150m, different displacement Q ij The annulus flow pressure drop correction coefficients at =10, 15, 20, 25, 30L/s are shown in table 3;
TABLE 3 annular flow pressure drop correction coefficient table for different depths and different displacements
S5, making a correction coefficient chart, and drawing an annular flow pressure drop correction coefficient curve under different displacement conditions at different depth points, as shown in FIG. 2;
for another well in the same block, the well body structure, the well track, the drilling tool structure and the drilling fluid performance are the same as those of the well, the actual drilling depth D =1080 m, the actual circulating discharge Q =22L/s is different from the drilling depth D 1 、D 2 、D 3 And a cyclic displacement Q ij And (4) adopting Lagrange linear interpolation to obtain annular flow pressure drop correction coefficients corresponding to the circulation displacement of 22L/s at 1050m and 1100m depths first, and then interpolating to obtain annular flow pressure drop correction coefficients corresponding to the circulation displacement of 22L/s at 1080m depths. The calculation is as follows:
calculating an annular flow pressure drop correction coefficient corresponding to the circulation displacement of 22L/s at the depth of 1050 m:
calculating an annular flow pressure drop correction coefficient corresponding to the circulation displacement of 22L/s under the depth of 1100 m:
calculating an annular flow pressure drop correction coefficient corresponding to the circulation displacement of 22L/s at the depth of 1080 m:
recording the calculated annulus flow pressure drop correction factor 1.1625 into an industrial control computer 8, so that the bottom hole pressure under the conditions that the actual drilling depth D =1080 m and the actual cyclic discharge Q =22L/s can be conveniently calculated;
s6, in the drilling construction process, the pressure monitored by the pressure sensor 9 is lower and lower than the rated pressure bearing capacity of the density sensor 4, the first automatic flat valve 3 and the third automatic flat valve 6 are opened through the industrial control computer 8, the second automatic flat valve 5 is closed, and the initial opening state of the automatic throttle valve 10 is 50%;
s7, starting the mud pump 13 to start circulation, and monitoring the flow Q of the annular return i Density ρ =22L/s i ＝1.18g/cm 3 Pressure P i =0.1MPa, and the bottom hole pressure at 1080m depth is calculated and analyzed by the industrial control computer 8 to be P di =12.95MPa; meanwhile, the pore pressure P at 1080m is obtained in a Lagrange linear interpolation mode pi =11.44MPa, loss pressure P fi =14.83MPa, P di And P pi And P fi The comparison shows that: p pi <P di <P fi The system only performs monitoring processing without adjusting the opening of the automatic throttle valve 10.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (2)
1. The utility model provides a drilling system is pressed in simple and easy accuse based on monitoring is returned to annular space, its characterized in that: the system comprises a shaft (1), a drill string (2), a first automatic flat valve (3), a second automatic flat valve (5), a third automatic flat valve (6), a density sensor (4), a flow sensor (7), an industrial control computer (8) for pressure-controlled drilling annular pressure analysis and control software, a pressure sensor (9), an automatic throttle valve (10), an injection pipeline (11), an annular return pipeline (12) and a mud tank (14); one end of the injection pipeline (11) is communicated with the upper end of the drill string (2), the other end of the injection pipeline is inserted into the mud tank (14), the bottom end of the drill string (2) is inserted into the shaft (1), one end of the annular return pipeline (12) is connected with an outlet at the upper end of the shaft (1), and the other end of the annular return pipeline is inserted into the mud tank (14); the density sensor (4), the flow sensor (7), the pressure sensor (9) and the automatic throttle valve (10) are sequentially arranged along an annular return pipeline (12), signal output ends of the density sensor (4), the flow sensor (7), the pressure sensor (9) and the automatic throttle valve (10) are all connected with a signal input end of an industrial control computer (8), signal input ends of the first automatic flat valve (3), the second automatic flat valve (5), the third automatic flat valve (6) and the automatic throttle valve (10) are all connected with a signal output end of the industrial control computer (8), and the industrial control computer (8) controls the first automatic flat valve (3), the second automatic flat valve (5), the third automatic flat valve (6) and the automatic throttle valve (10);
the density sensor (4) is connected with the first automatic flat valve (3), the second automatic flat valve (5) and the third automatic flat valve (6) through pipelines and then is connected to an annular return pipeline (12);
and the injection pipeline (11) and the annular return pipeline (12) are respectively connected with a slurry pump (13) and an automatic throttle valve (10).
2. A simple pressure control drilling method based on annular return monitoring is characterized in that: the method comprises the following steps:
s1, establishing a simple pressure control drilling system based on annular return monitoring;
s2, in the process of secondary-start and later-start drilling, selecting m depth points in an open hole section, wherein the serial numbers of the depth points are represented by i, the values of the depth points i comprise the depth of an upper casing shoe and the bottom of a well, and the value of the depth point i of the casing shoe is 1; vertical depth D i I =1, 8729, 872929, m, with different vertical depths D i Pore pressure P of pi Different vertical depth D i At a fracture pressure P fi Drilling fluid density is rho d The actual drilling depth is D, the actual drilling circulation displacement is Q, and the circulation displacement test standard point is Q ij The drill bit is at D i Standard point Q of each cycle displacement test in depth ij Corresponding PWD bottom hole pressure value is P pij At different vertical depths D i At, press Q i1 →Q i2 →∙∙∙∙Q ij The displacements are respectively circulated, the maximum displacement does not exceed the allowable maximum drilling circulation displacement, wherein j is a numerical value of the displacement, and the corresponding PWD bottom hole pressure under each circulation displacement is recordedValue P pi1 →P pi2 →∙∙∙∙P pij ；
S3, aiming at the technical casing, calculating the positions of the drill bits at different vertical depths D through an industrial control computer (8) i At different cyclic displacements Q ij The values of bottom hole pressure, depth point and circulating discharge capacity in circulation are the same as those in the step S2, and each circulating discharge capacity test standard point Q is set ij Lower corresponding bottom hole pressure value P cij According to Q i1 →Q i2 →∙∙∙∙Q ij Respectively circulating the discharge volumes, wherein j is the numerical value of the discharge volume, and recording the corresponding bottom hole pressure value P under each circulation discharge volume ci1 →P ci2 →∙∙∙∙P cij ；
S4, when bottom hole pressure is calculated, assuming that the well hole is a regular smooth well hole, and eliminating the influence of an actual irregular well hole and roughness, so that a software model needs to be corrected, and calculating corresponding annulus flow pressure drop correction coefficients under different displacement of different depth points i:
(P pi1 -P pi-1,1 -0.00981*ρ d *D i )/(P ci1 -P ci-1,1 -0.00981*ρ d *D i )→(P pi2 -P pi-1,2 -0.00981*ρ d *D i )/(P ci2 -P ci-1,2 -0.00981*ρ d *D i )→∙∙∙∙(P pij -P pi-1,j -0.00981*ρ d *D i )/(P cij -P ci-1,j -0.00981*ρ d *D i )，
wherein P is p0,1 ，P p0,2 ∙∙∙∙P p0,j Measured pressure at different displacement at the well head, P c0,1 ，P c0,2 ∙∙∙∙P c0,j For the calculated pressure at different displacements at the well head, P is the depth zero point because the well head is p0,1 ，P p0,2 ∙∙∙∙P p0,j ，P c0,1 ，P c0,2 ∙∙∙∙P c0,j Are all equal to 0;
wherein Ppi1 is a vertical depth Di part, and a PWD (measured downhole pressure) value is measured under the condition that the circulation displacement is Qi 1;
ppi-1,1 is the vertical depth Di-1, and the PWD measures the bottom hole pressure value under the condition that the circulation displacement is Qi-1, 1;
pci1 is an industrial control computer calculation value at a vertical depth Di and the cyclic displacement is Qi 1;
pci-1,1 is an industrial control computer calculation value at a vertical depth Di-1 and the circulation displacement is Qi-1, 1;
ppi2 is a vertical depth Di part, and a PWD (measured downhole pressure) value is measured under the condition that the circulation displacement is Qi 2;
ppi-1,2 is the vertical depth Di-1, and the PWD measures the bottom hole pressure value under the condition that the circulation displacement is Qi-1, 2;
pci2 is an industrial control computer calculated value at the vertical depth Di and the circulation displacement Qi 2;
pci-1,2 is calculated value of industrial control computer at vertical depth Di-1 and circulation displacement Qi-1, 2;
ppij is a bottom hole pressure value measured by a PWD under the condition that the vertical depth Di is and the circulation displacement is Qij;
ppi-1, j is a bottom hole pressure value measured by a PWD under the condition of vertical depth Di-1 and cyclic discharge capacity Qi-1, j;
pcij is a calculated value of an industrial control computer at the vertical depth Di and the cyclic displacement is Qij;
pci-1, j is calculated value of the industrial control computer under the condition of vertical depth Di-1 and circulation displacement Qi-1, j;
s5, making a correction coefficient chart, drawing an annular flow pressure drop correction coefficient curve under different displacement conditions of different depth points, and drawing a correction coefficient curve for the condition that the actual drilling depth D and the actual circulation displacement Q are different from the vertical depth D i And a cyclic displacement Q ij When the pressure is in a standard point, an annular flow pressure drop correction coefficient is obtained by adopting a Lagrange linear interpolation mode, and the calculated pressure correction coefficient is recorded into an industrial control computer (8);
s6, in the drilling construction process, when the pressure monitored by the pressure sensor (9) is lower than the rated pressure-bearing capacity of the density sensor (4), the first automatic flat valve (3) and the third automatic flat valve (6) are opened through the industrial control computer (8), the second automatic flat valve (5) is closed, and the initial opening state of the automatic throttle valve (10) is 50%; when the pressure monitored by the pressure sensor (9) is higher than the rated pressure-bearing capacity of the density sensor (4), the industrial control computer (8) controls to open the second automatic flat valve (5) and close the first automatic flat valve (3) and the third automatic flat valve (6), and the initial opening state of the automatic throttle valve (10) is 50%;
s7, starting a mud pump (13) to start circulation, and setting an annulus to return to monitor flow Q i Density rho i Pressure P i Vertical depth D i Bottom hole pressure of P di And the monitored flow Q of the annular space return i Density rho i Pressure P i Directly enters an industrial control computer (8) for calculation and analysis to obtain the bottom hole pressure P under the actual drilling depth D di Simultaneously with the pore pressure P at the actual drilling depth D pi And the loss pressure P fi Comparing;
if P pi <P di <P fi The system only carries out monitoring processing;
if P pi >P di The system will control the automatic throttle valve (10) to decrease the opening until P pi <P di Until the end;
if P di >P fi The system controls the automatic throttle valve (10) to increase the opening until P di <P fi Until now.
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| CN201811388482.7A CN109736772B (en) | 2018-11-21 | 2018-11-21 | Simple pressure control drilling method and system based on annular return monitoring |
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| CN101852076B (en) * | 2010-03-31 | 2013-09-04 | 中国石油天然气集团公司 | Underground working condition simulation method for controlled pressure drilling experiment and test |
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| CN203257353U (en) * | 2013-05-08 | 2013-10-30 | 河北华北石油荣盛机械制造有限公司 | Novel pressure control drilled well system |
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