CN116974312A - Method for controlling pressure of drilling and production shaft of natural gas hydrate - Google Patents
Method for controlling pressure of drilling and production shaft of natural gas hydrate Download PDFInfo
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- CN116974312A CN116974312A CN202311226107.3A CN202311226107A CN116974312A CN 116974312 A CN116974312 A CN 116974312A CN 202311226107 A CN202311226107 A CN 202311226107A CN 116974312 A CN116974312 A CN 116974312A
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- 238000005553 drilling Methods 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 230000003993 interaction Effects 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 9
- 101150011264 setB gene Proteins 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 2
- -1 natural gas hydrates Chemical class 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
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- 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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Abstract
The application relates to the field of drilling engineering, and provides a method for controlling the pressure of a drilling shaft by using natural gas hydrate, which comprises the steps of acquiring pressure data of the bottom of the drilling shaft in the drilling shaft, acquiring pressure data of a drill bit by using a drilling machine in the drilling process of the natural gas hydrate, recording the pressure data of the bottom of the drilling shaft as first data, recording the pressure data of the drill bit as second data, and establishing a pressure interaction registration curve based on the first data and the second data. The method can accurately control pressure matching in the drilling and production process, prevent the drilling machine from generating pressure unbalance, establish a pressure interactive registration curve by carrying out data matching on pressure data of the drilling bottom and the drilling bit of the drilling machine, and realize the prediction of pressure change trend through the curve, thereby accurately controlling pressure adjustment in the production operation process, enabling the drilling bit to be always kept in a proper pressure interval, ensuring the service life of the drilling tool, realizing balanced pressure drilling at the same time, and improving the drilling and production efficiency.
Description
Technical Field
The application relates to the field of drilling engineering, in particular to a method for controlling the pressure of a drilling and production shaft of natural gas hydrate.
Background
Natural gas hydrate is a natural gas resource widely existing in marine sediments, has high energy density and abundant reserves, is mostly existing in deep sea sediments or land sediments in very low temperature environments, and is in a stable state under the conditions of high pressure and low temperature and has high vulnerability, so that various factors are required to be considered in the process of exploiting the natural gas hydrate, including pressure control, temperature management, well bore stability and the like.
In the drilling and production process of natural gas hydrate, the pressure control of a drill bit is a key factor influencing the drilling and production effect, when the pressure at the bottom of the well is higher than the applied pressure of a drilling machine, high-pressure stratum fluid can be sprayed out from the bottom of the well to form a blowout phenomenon, and when the pressure at the bottom of the well is lower than the pressure of the drilling machine, the wall of the well is easily unstable, so that the problems of deformation of a shaft, jamming of the drill bit, collapse of the borehole and the like are caused, and the normal operation of the drilling and production work is seriously influenced.
The traditional pressure control method mainly depends on adjusting the density and flow of drilling fluid or balancing the bottom hole pressure and the drilling pressure by a pressure turbine system, a blowout prevention wellhead and other safety devices, however, most of the drilling and production environment of the natural gas hydrate is in complex geological conditions, meanwhile, the position of the hydrate has unpredictable distribution characteristics, and the traditional pressure control method is difficult to realize accurate pressure control in the face of drilling and production operation under high-pressure low-temperature environment, so that an accurate control method capable of monitoring and adjusting the pressure of a drill bit in real time is needed to enhance the pressure calibration performance in the drilling and production process of the natural gas hydrate, further improve the production efficiency and safety, and adapt to the requirements of different geological conditions and drilling and production environments.
Disclosure of Invention
The application aims to provide a method for controlling the pressure of a drilling and production shaft of natural gas hydrate, which aims to solve one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.
The application provides a method for controlling pressure of a drilling and production shaft of natural gas hydrate, which comprises the steps of obtaining pressure data of the bottom of a drilling well in the shaft, obtaining pressure data of a drill bit through a drilling machine in the drilling and production process of the natural gas hydrate, recording the pressure data of the bottom of the drilling well as first data, recording the pressure data of the drill bit as second data, and establishing a pressure interaction registration curve based on the first data and the second data. The method can accurately control pressure matching in the drilling and production process, prevent the drilling machine from generating pressure unbalance, establish a pressure interactive registration curve by carrying out data matching on pressure data of the drilling bottom and the drilling bit of the drilling machine, and realize the prediction of pressure change trend through the curve, thereby accurately controlling pressure adjustment in the production operation process, enabling the drilling bit to be always kept in a proper pressure interval, ensuring the service life of the drilling tool, realizing balanced pressure drilling at the same time, and improving the drilling and production efficiency.
To achieve the above object, according to an aspect of the present application, there is provided a method for controlling pressure in a natural gas hydrate drilling and production wellbore, the method comprising the steps of:
s100, acquiring pressure data of the bottom of a well in a shaft;
s200, in the drilling and production process of the natural gas hydrate, pressure data of a drill bit are obtained through a drilling machine;
s300, recording pressure data of the bottom of the well as first data and recording pressure data of the drill bit as second data;
and S400, establishing a pressure interaction registration curve based on the first data and the second data.
Further, in step S100, the method for acquiring pressure data of the bottom of the well in the wellbore includes: arranging a logging while drilling instrument in a shaft, and monitoring the pressure at the bottom of the well drilling in the shaft in real time through a pressure sensor in the logging while drilling instrument, so as to obtain real-time pressure data at the bottom of the well drilling in the shaft, wherein the bottom of the well drilling, namely a local stratum contacted by a drill bit of a drilling machine and the bottom of the shaft; or, acquiring real-time pressure data of the bottom of the well drilling in the shaft through a multi-parameter comprehensive well logging system, or acquiring real-time pressure data of the bottom of the well drilling in the shaft through a pressure while-drilling monitoring system;
in any period T, with T i As the ith second in the period T, i is the sequence number, T i For the time of day, PA (T i ) At time T as logging while drilling tool i The monitored pressure of the bottom of the well in the well bore is i=1, 2, …, N, N is the length of the period T, and PA (T i )=PA(T 1 ),PA(T 2 ),…,PA(T N ) PA (T) i ) Recorded as pressure data at the bottom of the well in the wellbore.
Alternatively, the model of the logging while drilling tool is SDJWH-3.
Optionally, the installation location of the logging while drilling instrument is an inner wall of the wellbore or attached to a drill pipe of the drilling rig.
Further, in step S200, during the drilling process of the natural gas hydrate, the method for obtaining the pressure data of the drill bit through the drilling machine specifically includes: during a period T, real-time pressure data of the drill bit is acquired by a pressure sensor in the drill, at PB (T i ) As a drill bit at time T i Pressure of PB (T) i )=PB(T 1 ),PB(T 2 ),…,PB(T N ) PB (T) i ) Recorded as pressure data for the drill bit.
Alternatively, the period T is set to any N minutes (length n×60) within 24 hours of a natural day, or any period (length in seconds) of length n×60 during drilling of the natural gas hydrate in the wellbore, where N is an integer in the interval [30,60 ].
Further, in step S300, the method for recording the pressure data of the bottom of the well as the first data and recording the pressure data of the drill as the second data specifically includes: creating a blank set PA respectively]And a blank set PB []The method comprises the steps of carrying out a first treatment on the surface of the Pressure data PA (T 1 ),PA(T 2 ),…,PA(T N ) All added to the set PA]Pressure data PB (T 1 ),PB(T 2 ),…,PB(T N ) All added to set PB]In (C), then, the set PA []Sum set PB []Is N in length; memory collection PA]For the first data, record set PB [ []Is the second data.
Further, in step S400, the method for establishing the pressure interaction registration curve based on the first data and the second data specifically includes:
s401, taking PA (i) as an ith element in the array PA, taking PB (i) as an ith element in the array PB, taking i as a serial number, taking the value range of i as i=1, 2, … and N, initializing a variable j, wherein the value range of the variable j is the same as the value range of the serial number i, taking PA (j) as the jth element in the array PA, and the value of PA (j) changes along with the value change of the variable j;
setting a variable R1 and a variable R2, wherein initial values of R1 and R2 are set to 0, and two blank sets setA { } and setB { } are set respectively, traversing variable j from j=1, and turning to S402;
s402, adding all elements with the element value larger than the value of PA (j) into the set setA { } in the array PB, adding all elements with the element value smaller than the value of PA (j) into the set setB { }, wherein the length of the set setA { } is represented by N1 (namely, the number of all elements in the set setA { }), the length of the set setB { } is represented by N2, and the process goes to S403;
s403, increasing the value of the variable R1 by N1, increasing the value of the variable R2 by N2, and simultaneously clearing the set setA { and the set setB { } (i.e. deleting all elements in the two sets);
if the value of the current variable j is less than N, the value of the variable j is increased by 1, and the process goes to S402; if the value of the current variable j is equal to or greater than N, go to S404;
s404, respectively creating a blank array cre [ ] and a blank array ple [ ], and comparing the value of R1 with the value of R2;
if R1> R2, selecting R data of PA (1), PA (2), … and PA (R) from the array PA, adding the R data into an array cre [ ], and simultaneously selecting PB (R+1), PB (R+2), … and PB (N) from an array PB, adding the PB (R+2) and PB (N) into an array ple [ ];
if R1< R2, selecting PB (1), PB (2), … and PB (R) in the array PB, adding the R data into the array cre [ ], selecting PA (R+1), PA (R+2), … and PA (N) in the array PA, adding the PA (N) into the array ple [ ], and turning to S405;
where r=int (max { R1, R2 }/N), max { } represents maximum value of the numbers in { }, INT () represents rounding down the numbers in ();
s405, using cre (x) to represent the xth element in the array cre [ ], wherein x is a serial number, the value range of x is x=1, 2, …, S1, S1 is the number of all elements in the array cre [ ]; the element y in the array ple [ ] is represented by ple (y), y is a variable, the value range of y is y=1, 2, …, S2, S2 is the number of all elements in the array ple [ ];
a pressure interaction registration curve is established based on the first pressure coefficient and the second pressure coefficient.
Further, the method for establishing the pressure interaction registration curve based on the first pressure coefficient and the second pressure coefficient specifically comprises the following steps:
record the first pressure coefficientNote second pressure coefficient->The method comprises the steps of carrying out a first treatment on the surface of the Wherein H0 is an array cre [ sic ]]Average value of all elements in (1) H1 is array ple [ []Average value of all elements in (a);
establishing a pressure interaction registration curve P_cure (P):
where p is the argument of the curve, the definition field of p is (0, + -infinity), K 0 =R/2。
The beneficial effects of this step are: in order to realize balanced pressure drilling, the pressure data of the land contacted by the drill bit is indispensable, when the pressure of the drilling machine is not matched with the bottom hole pressure, the phenomena of pressure unbalance, drilling failure and the like are easily caused, the drilling machine is abnormal in load, the normal operation of mining operation is influenced, the method of the step obtains first data and second data by sampling the real-time pressure data of the bottom of the drilling machine and the drill bit of the drilling machine, mutually matched data segments are screened out in the two groups of data, a pressure interaction registration curve is established by utilizing the data segments, the pressure interaction registration curve is matched with the two situations of pressure sharp increase or abrupt decrease in a sectional function mode, when the change of the curve is steeper, the degree of unbalance of the drilling pressure and the bottom hole pressure is larger at the moment, therefore, the adjustment amplitude of the pressure of the drill bit is required to be relatively increased, when the change of the curve is gentle, the adjustment amplitude of the pressure of the drill bit is relatively reduced so as to realize pressure balance during drilling, meanwhile, the first pressure coefficient and the second pressure coefficient are used for carrying out curvature fine adjustment on the pressure interactive registration curve, so that the slope of the curve is accurately matched with the adjustment amplitude of the pressure of the drill bit, the pressure balance during drilling is effectively realized through the pressure interactive registration curve, the high-accuracy pressure adjustment of the drill bit is realized according to the real-time curvature of the curve, balanced pressure drilling is realized, the risk of stratum fracturing is reduced to the greatest extent, the phenomena of pressure unbalance and the like are avoided during drilling, the efficiency of the drilling and production operation of the natural gas hydrate is fully improved, and the safe operation of the drilling machine is ensured.
Optionally, in step S400, a pressure interaction registration curve is established based on the first data and the second data, and the method further includes controlling the pressure of the drill bit through the pressure interaction registration curve, specifically: set time T 0 The method comprises the steps of obtaining a drill bit at a moment T through a pressure sensor in a drilling machine at any moment in the drilling and production process of natural gas hydrate 0 Pressure magnitude PB (T) 0 ) Calculating a pressure cross-registration curve p_cut (P) at point p=pb (T 0 ) Slope K at 1 The method comprises the steps of carrying out a first treatment on the surface of the Let K be p For K 1 A pressure value of units;
if PB (T) 0 ) Falling within the interval (0, M), at time T 0 After t0 seconds, raise the pressure of the drill bit by K p The method comprises the steps of carrying out a first treatment on the surface of the If PB (T) 0 ) Falls within the interval (M, + -infinity), then at time T 0 For t0 seconds thereafter, the pressure of the drill bit is reduced by K p ；
Wherein t0 is set to any one integer in the interval [5,30], m=m2/M1.
Preferably, the pressure of the drill bit is controlled through the pressure interaction registration curve, and the method can also be as follows: set time T 0 The method comprises the steps of obtaining a drill bit at a moment T through a pressure sensor in a drilling machine at any moment in the drilling and production process of natural gas hydrate 0 Pressure magnitude PB (T) 0 ) The method comprises the steps of carrying out a first treatment on the surface of the If PB (T) 0 ) Falling within the interval (0, M), at time T 0 After t0 seconds, the pressure of the drill bit is increased by 10%; if PB (T) 0 ) Falls within the interval (M, + -infinity), then at time T 0 After t0 seconds, the pressure of the drill bit is reduced by 10%.
The beneficial effects of the application are as follows: the method can accurately control pressure matching in the drilling and production process, prevent the drilling machine from generating pressure unbalance, establish a pressure interactive registration curve by carrying out data matching on pressure data of the drilling bottom and the drilling bit of the drilling machine, and realize the prediction of pressure change trend through the curve, thereby accurately controlling pressure adjustment in the production operation process, enabling the drilling bit to be always kept in a proper pressure interval, ensuring the service life of the drilling tool, realizing balanced pressure drilling at the same time, and improving the drilling and production efficiency.
Drawings
The above and other features of the present application will become more apparent from the detailed description of the embodiments thereof given in conjunction with the accompanying drawings, in which like reference characters designate like or similar elements, and it is apparent that the drawings in the following description are merely some examples of the present application, and other drawings may be obtained from these drawings without inventive effort to those of ordinary skill in the art, in which:
FIG. 1 is a flow chart of a method for controlling the pressure of a natural gas hydrate drilling and production wellbore.
Detailed Description
The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
In the description of the present application, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
A flow chart of a method for controlling the pressure of a natural gas hydrate drilling and production well bore according to the present application is shown in fig. 1, and a method for controlling the pressure of a natural gas hydrate drilling and production well bore according to an embodiment of the present application is described below with reference to fig. 1.
The application provides a method for controlling the pressure of a drilling and production shaft of natural gas hydrate, which comprises the following steps:
s100, acquiring pressure data of the bottom of a well in a shaft;
s200, in the drilling and production process of the natural gas hydrate, pressure data of a drill bit are obtained through a drilling machine;
s300, recording pressure data of the bottom of the well as first data and recording pressure data of the drill bit as second data;
and S400, establishing a pressure interaction registration curve based on the first data and the second data.
Further, in step S100, the method for acquiring pressure data of the bottom of the well in the wellbore includes: arranging a logging while drilling instrument in a shaft, and monitoring the pressure at the bottom of the well drilling in the shaft in real time through a pressure sensor in the logging while drilling instrument, so as to obtain real-time pressure data at the bottom of the well drilling in the shaft, wherein the bottom of the well drilling, namely a local stratum contacted by a drill bit of a drilling machine and the bottom of the shaft;
in any period T, with T i As the ith second in the period T, i is the sequence number, T i For the time of day, PA (T i ) At time T as logging while drilling tool i The monitored pressure of the bottom of the well in the well bore is i=1, 2, …, N, N is the length of the period T, and PA (T i )=PA(T 1 ),PA(T 2 ),…,PA(T N ) PA (T) i ) Recorded as pressure data at the bottom of the well in the wellbore.
Further, in step S200, during the drilling process of the natural gas hydrate, the method for obtaining the pressure data of the drill bit through the drilling machine specifically includes: during a period T, real-time pressure data of the drill bit is acquired by a pressure sensor in the drill, at PB (T i ) As a drill bit at time T i Pressure of PB (T) i )=PB(T 1 ),PB(T 2 ),…,PB(T N ) PB (T) i ) Recorded as pressure data for the drill bit.
Specifically, the period T is set to any N minutes (period length n×60, second system) within 24 hours of one natural day, where N is set to 30.
Further, in step S300, the method for recording the pressure data of the bottom of the well as the first data and recording the pressure data of the drill as the second data specifically includes: creating a blank set PA respectively]And a blank set PB []The method comprises the steps of carrying out a first treatment on the surface of the Pressure data PA (T 1 ),PA(T 2 ),…,PA(T N ) All added to the set PA]Pressure data PB (T 1 ),PB(T 2 ),…,PB(T N ) All added to set PB]In (C), then, the set PA []Sum set PB []Is N in length; memory collection PA]For the first data, record set PB [ []Is the second data.
Further, in step S400, the method for establishing the pressure interaction registration curve based on the first data and the second data specifically includes:
s401, taking PA (i) as an ith element in the array PA, taking PB (i) as an ith element in the array PB, taking i as a serial number, taking the value range of i as i=1, 2, … and N, initializing a variable j, wherein the value range of the variable j is the same as the value range of the serial number i, taking PA (j) as the jth element in the array PA, and the value of PA (j) changes along with the value change of the variable j;
setting a variable R1 and a variable R2, wherein initial values of R1 and R2 are set to 0, and two blank sets setA { } and setB { } are set respectively, traversing variable j from j=1, and turning to S402;
s402, adding all elements with the element value larger than the value of PA (j) into the set setA { } in the array PB, adding all elements with the element value smaller than the value of PA (j) into the set setB { }, wherein the length of the set setA { } is represented by N1 (namely, the number of all elements in the set setA { }), the length of the set setB { } is represented by N2, and the process goes to S403;
s403, increasing the value of the variable R1 by N1, increasing the value of the variable R2 by N2, and simultaneously clearing the set setA { and the set setB { } (i.e. deleting all elements in the two sets);
if the value of the current variable j is less than N, the value of the variable j is increased by 1, and the process goes to S402; if the value of the current variable j is equal to or greater than N, go to S404;
s404, respectively creating a blank array cre [ ] and a blank array ple [ ], and comparing the value of R1 with the value of R2;
if R1> R2, selecting R data of PA (1), PA (2), … and PA (R) from the array PA, adding the R data into an array cre [ ], and simultaneously selecting PB (R+1), PB (R+2), … and PB (N) from an array PB, adding the PB (R+2) and PB (N) into an array ple [ ];
if R1< R2, selecting PB (1), PB (2), … and PB (R) in the array PB, adding the R data into the array cre [ ], selecting PA (R+1), PA (R+2), … and PA (N) in the array PA, adding the PA (N) into the array ple [ ], and turning to S405;
where r=int (max { R1, R2 }/N), max { } represents maximum value of the numbers in { }, INT () represents rounding down the numbers in ();
s405, using cre (x) to represent the xth element in the array cre [ ], wherein x is a serial number, the value range of x is x=1, 2, …, S1, S1 is the number of all elements in the array cre [ ]; the element y in the array ple [ ] is represented by ple (y), y is a variable, the value range of y is y=1, 2, …, S2, S2 is the number of all elements in the array ple [ ];
a pressure interaction registration curve is established based on the first pressure coefficient and the second pressure coefficient.
Further, the method for establishing the pressure interaction registration curve based on the first pressure coefficient and the second pressure coefficient specifically comprises the following steps:
record the first pressure coefficientNote second pressure coefficient->The method comprises the steps of carrying out a first treatment on the surface of the Wherein H0 is an array cre [ sic ]]Average value of all elements in (1) H1 is array ple [ []Average value of all elements in (a);
establishing a pressure interaction registration curve P_cure (P):
where p is the argument of the curve, the definition field of p is (0, + -infinity), K 0 =R/2。
Optionally, in step S400, a pressure interaction registration curve is established based on the first data and the second data, and the method further includes controlling the pressure of the drill bit through the pressure interaction registration curve, specifically: set time T 0 The method comprises the steps of obtaining a drill bit at a moment T through a pressure sensor in a drilling machine at any moment in the drilling and production process of natural gas hydrate 0 Pressure magnitude PB (T) 0 ) Calculating a pressure cross-registration curve p_cut (P) at point p=pb (T 0 ) Slope K at 1 The method comprises the steps of carrying out a first treatment on the surface of the Let K be p For K 1 A pressure value of units;
if PB (T) 0 ) Falling within the interval (0, M), at time T 0 After t0 seconds, raise the pressure of the drill bit by K p The method comprises the steps of carrying out a first treatment on the surface of the If PB (T) 0 ) Falls within the interval (M, + -infinity), then at time T 0 For t0 seconds thereafter, the pressure of the drill bit is reduced by K p ；
Where t0 is set to 10, m=m2/M1.
Preferably, the pressure of the drill bit is controlled through the pressure interaction registration curve, and the method can also be as follows: set time T 0 The method comprises the steps of obtaining a drill bit at a moment T through a pressure sensor in a drilling machine at any moment in the drilling and production process of natural gas hydrate 0 Pressure magnitude PB (T) 0 ) The method comprises the steps of carrying out a first treatment on the surface of the If PB (T) 0 ) Falling within the interval (0, M), at time T 0 After t0 seconds, the pressure of the drill bit is increased10%; if PB (T) 0 ) Falls within the interval (M, + -infinity), then at time T 0 After t0 seconds, the pressure of the drill bit is reduced by 10%.
The application provides a method for controlling pressure of a drilling and production shaft of natural gas hydrate, which comprises the steps of obtaining pressure data of the bottom of a drilling well in the shaft, obtaining pressure data of a drill bit through a drilling machine in the drilling and production process of the natural gas hydrate, recording the pressure data of the bottom of the drilling well as first data, recording the pressure data of the drill bit as second data, and establishing a pressure interaction registration curve based on the first data and the second data. The method can accurately control pressure matching in the drilling and production process, prevent the drilling machine from generating pressure unbalance, establish a pressure interactive registration curve by carrying out data matching on pressure data of the drilling bottom and the drilling bit of the drilling machine, and realize the prediction of pressure change trend through the curve, thereby accurately controlling pressure adjustment in the production operation process, enabling the drilling bit to be always kept in a proper pressure interval, ensuring the service life of the drilling tool, realizing balanced pressure drilling at the same time, and improving the drilling and production efficiency. Although the present application has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any such detail or embodiment or any particular embodiment so as to effectively cover the intended scope of the application. Furthermore, the foregoing description of the application has been presented in its embodiments contemplated by the inventors for the purpose of providing a useful description, and for the purposes of providing a non-essential modification of the application that may not be presently contemplated, may represent an equivalent modification of the application.
Claims (7)
1. A method for controlling pressure in a drilling and production well bore of natural gas hydrate, comprising the steps of:
s100, acquiring pressure data of the bottom of a well in a shaft;
s200, in the drilling and production process of the natural gas hydrate, pressure data of a drill bit are obtained through a drilling machine;
s300, recording pressure data of the bottom of the well as first data and recording pressure data of the drill bit as second data;
and S400, establishing a pressure interaction registration curve based on the first data and the second data.
2. The method for controlling the pressure of a drilling well bore by using natural gas hydrate according to claim 1, wherein in step S100, the method for acquiring pressure data of the bottom of the drilling well bore in the well bore is as follows: arranging a logging while drilling instrument in a shaft, and monitoring the pressure at the bottom of the well drilling in the shaft in real time through a pressure sensor in the logging while drilling instrument, so as to obtain real-time pressure data at the bottom of the well drilling in the shaft, wherein the bottom of the well drilling, namely a local stratum contacted by a drill bit of a drilling machine and the bottom of the shaft; or, acquiring real-time pressure data of the bottom of the well drilling in the shaft through a multi-parameter comprehensive well logging system, or acquiring real-time pressure data of the bottom of the well drilling in the shaft through a pressure while-drilling monitoring system; PA (T) i ) Recorded as pressure data at the bottom of the well in the wellbore.
3. A method of controlling wellbore pressure in drilling and production of natural gas hydrates as claimed in claim 2, wherein PA (T i ) The calculation method of (a) specifically comprises the following steps:
in any period T, with T i As the ith second in the period T, i is the sequence number, T i For the time of day, PA (T i ) At time T as logging while drilling tool i The monitored pressure of the bottom of the well in the well bore is i=1, 2, …, N, N is the length of the period T, and PA (T i )=PA(T 1 ),PA(T 2 ),…,PA(T N ) PA (T) i ) Recorded as pressure data at the bottom of the well in the wellbore.
4. The method for controlling the pressure of a drilling well bore by using a natural gas hydrate according to claim 1, wherein in step S200, the method for obtaining pressure data of a drill bit by using a drilling machine during the drilling process of the natural gas hydrate is specifically as follows: during a period T, real-time pressure data of the drill bit is acquired by a pressure sensor in the drill, at PB (T i ) As a drill bit at time T i Pressure of PB (T) i )=PB(T 1 ),PB(T 2 ),…,PB(T N ) Will bePB(T i ) Recorded as pressure data for the drill bit.
5. The method for controlling the pressure of a drilling well bore by using natural gas hydrate according to claim 1, wherein in step S300, the method for recording pressure data of the bottom of the drilling well as first data and recording pressure data of the drill bit as second data specifically comprises: creating a blank set PA respectively]And a blank set PB []The method comprises the steps of carrying out a first treatment on the surface of the Pressure data PA (T 1 ),PA(T 2 ),…,PA(T N ) All added to the set PA]Pressure data PB (T 1 ),PB(T 2 ),…,PB(T N ) All added to set PB]In (C), then, the set PA []Sum set PB []Is N in length; memory collection PA]For the first data, record set PB [ []Is the second data.
6. The method for controlling pressure in a drilling and production well bore of a natural gas hydrate according to claim 1, wherein in step S400, the method for establishing a pressure interaction registration curve based on the first data and the second data specifically comprises:
s401, taking PA (i) as an ith element in the array PA, taking PB (i) as an ith element in the array PB, taking i as a serial number, taking the value range of i as i=1, 2, … and N, initializing a variable j, wherein the value range of the variable j is the same as the value range of the serial number i, taking PA (j) as the jth element in the array PA, and the value of PA (j) changes along with the value change of the variable j;
setting a variable R1 and a variable R2, wherein initial values of R1 and R2 are set to 0, and two blank sets setA { } and setB { } are set respectively, traversing variable j from j=1, and turning to S402;
s402, adding all elements with the element value larger than the value of PA (j) into the set setA { } in the array PB, adding all elements with the element value smaller than the value of PA (j) into the set setB { }, wherein the length of the set setA { } is represented by N1, the length of the set setB { } is represented by N2, and then turning to S403;
s403, increasing the value of the variable R1 by N1, increasing the value of the variable R2 by N2, and simultaneously clearing the set setA { and the set setB { };
if the value of the current variable j is less than N, the value of the variable j is increased by 1, and the process goes to S402; if the value of the current variable j is equal to or greater than N, go to S404;
s404, respectively creating a blank array cre [ ] and a blank array ple [ ], and comparing the value of R1 with the value of R2;
if R1> R2, selecting R data of PA (1), PA (2), … and PA (R) from the array PA, adding the R data into an array cre [ ], and simultaneously selecting PB (R+1), PB (R+2), … and PB (N) from an array PB, adding the PB (R+2) and PB (N) into an array ple [ ];
if R1< R2, selecting PB (1), PB (2), … and PB (R) in the array PB, adding the R data into the array cre [ ], selecting PA (R+1), PA (R+2), … and PA (N) in the array PA, adding the PA (N) into the array ple [ ], and turning to S405;
s405, using cre (x) to represent the xth element in the array cre [ ], wherein x is a serial number, the value range of x is x=1, 2, …, S1, S1 is the number of all elements in the array cre [ ]; the element y in the array ple [ ] is represented by ple (y), y is a variable, the value range of y is y=1, 2, …, S2, S2 is the number of all elements in the array ple [ ];
a pressure interaction registration curve is established based on the first pressure coefficient and the second pressure coefficient.
7. The method for controlling the pressure of a drilling and production well bore of a natural gas hydrate according to claim 6, wherein the calculating method of R is specifically as follows: r=int (max { R1, R2 }/N), max { } denotes that the number within { } is maximized, INT () denotes that the number within () is rounded down.
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