CN111456719B - Method and device for determining well control parameters of horizontal well, well control method and device - Google Patents
Method and device for determining well control parameters of horizontal well, well control method and device Download PDFInfo
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- CN111456719B CN111456719B CN201910004946.8A CN201910004946A CN111456719B CN 111456719 B CN111456719 B CN 111456719B CN 201910004946 A CN201910004946 A CN 201910004946A CN 111456719 B CN111456719 B CN 111456719B
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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
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Abstract
The invention provides a method and a device for determining a well control parameter of a horizontal well, and a method and a device for controlling the well, wherein the method for determining the well control parameter of the horizontal well comprises the following steps: acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process, wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth; calculating a low pump speed pump pressure when gas invasion occurs according to the first well parameter data; and calculating well control parameters according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs. The invention combines the characteristics of the horizontal well, can obtain accurate well control parameters, and ensures that the well control of the horizontal well can be safely and smoothly carried out.
Description
Technical Field
The invention belongs to the field of horizontal wells, and particularly relates to a method and a device for determining well control parameters of a horizontal well, and a method and a device for controlling the well.
Background
The actual measured well depth of the horizontal well is different from the measured well depth of the vertical well, namely the horizontal well is one more horizontal section than the vertical well section. The gas invasion of the horizontal section of the horizontal well can firstly influence the flow pattern of the gas-liquid two-phase flow of the horizontal section, after a large amount of stratum fluid is gushed in, the gas in the horizontal section can enter the deflecting section and the vertical well section, and the replacement of the liquid column in the vertical well section by the gas column can change the current static density so as to greatly influence the casing pressure. The drainage area of the reservoir of the horizontal well is large, relatively high pressure can be generated, and therefore the density of the well control fluid is difficult to accurately determine and the pressure control difficulty of the wellhead is high. In the prior art, the well control design method of the horizontal well is the same as that of the vertical well, and in view of the large difference between the structures of the horizontal well and the vertical well, the well control method of the conventional horizontal well can cause the over-balance and the under-balance of bottom hole pressure so as to generate well kick to a greater degree.
Disclosure of Invention
The method is used for solving the defect that the horizontal well pressure design method in the prior art is inaccurate, and the well bottom pressure is over-balanced and under-balanced so as to generate well kick to a greater degree.
In order to solve the technical problem, a first aspect of the present invention provides a method for determining a well pressure parameter of a horizontal well, including:
acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process, wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement ofP v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth;
calculating a low pump speed pump pressure when gas invasion occurs according to the first well parameter data;
and calculating well control parameters according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs.
A second aspect of the present invention provides a well control method for a horizontal well, comprising: determining a well control parameter according to the method described in the previous embodiment; and carrying out well killing according to the well killing parameters, wherein the well killing process comprises the following steps: continuously feeding original liquid into the well drilling in the first well killing circulation period, maintaining the original circulation pressure unchanged, and meanwhile, configuring well killing liquid according to the density of the well killing liquid; and in the second well killing circulation period, the well killing liquid is downwards fed into the well drilling, and in the process that the well killing liquid is downwards fed into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to the vertical pressure control curve.
A third aspect of the present invention provides a horizontal well killing parameter determining apparatus, comprising:
the parameter determining module is used for acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process, wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth;
the first calculation module is used for calculating a low pump speed pumping pressure when gas invasion occurs according to the first well parameter data;
and the second calculation module is used for calculating the well control parameter according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs.
A fourth aspect of the invention provides a well control system for a horizontal well, comprising: the device for determining a well killing parameter of a horizontal well according to the foregoing embodiment is configured to determine a well killing parameter; the well control device is used for controlling the well according to the well control parameters, and the well control process comprises the following steps: continuously feeding original liquid into the well drilling in the first well killing circulation period, maintaining the original circulation pressure unchanged, and meanwhile, configuring well killing liquid according to the density of the well killing liquid; and in the second well killing circulation period, the well killing liquid is downwards fed into the well drilling, and in the process that the well killing liquid is downwards fed into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to the vertical pressure control curve.
A fifth aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method for determining a horizontal well killing parameter according to the previous embodiment when executing the computer program.
A sixth aspect of the present invention provides a computer readable storage medium storing a computer program for executing a method for determining a horizontal well killing parameter according to the foregoing embodiment when executed by a processor.
According to the method and the device for determining the well pressure parameters of the horizontal well, the well control method and the device, the well control parameters can be accurately obtained by combining the characteristics of the horizontal well, and the well control of the horizontal well can be safely and smoothly carried out.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of a method for determining a horizontal well kill parameter in accordance with an embodiment of the present invention;
FIG. 2 shows a flow chart of a horizontal well killing method of an embodiment of the present invention;
FIG. 3A shows a schematic diagram of a conventional vertical pressure control curve for a conventional vertical well;
FIG. 3B is a schematic diagram of a vertical pressure control curve of a horizontal well according to an embodiment of the present invention;
FIG. 4 shows a block diagram of a horizontal well killing parameter determination apparatus according to an embodiment of the present invention;
fig. 5 is a diagram showing a configuration of a well control system for a horizontal well according to an embodiment of the present invention.
Detailed Description
In order to make the technical features and effects of the present invention more obvious, the technical solution of the present invention will be further described with reference to the accompanying drawings, and the present invention may be described or implemented by other different specific examples, and any equivalent transformation made by those skilled in the art within the scope of the claims falls within the protection scope of the present invention.
In the description of the present specification, the terms "first," "second," …, etc. are not used to denote a particular order or sequence, nor are they used to limit the invention, but are merely used to distinguish one element or operation from another in the same technical terms.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are used in an open-ended fashion, meaning including, but not limited to.
In the description of the present specification, reference to the terms "some embodiments," "some implementations," "particular examples," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The order of steps involved in the embodiments is illustrative of the practice of the invention, and is not limited and may be suitably modified as desired.
Referring to fig. 1, fig. 1 shows a flowchart of a method for determining a horizontal well killing parameter according to an embodiment of the present invention. According to the embodiment, by combining the characteristics of the horizontal well, accurate well control parameters can be obtained, so that well control of the horizontal well can be safely and smoothly carried out. Specifically, the method for determining the well control parameters of the horizontal well comprises the following steps:
s110, acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process. Wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth; the overflow parameter data includes: overflow X, vertical pressure value Y of shut-in wellhead and original drilling fluid density ρ l 。
And S120, calculating a low pump speed pumping pressure when gas invasion occurs according to the first well parameter data.
And S130, calculating the well control parameter according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs. Wherein the kill parameters include: initial circulating pressure, final circulating pressure and well control fluid density.
It is known to those skilled in the art that the low pump speed pumping pressure cannot be measured when gas invasion occurs, and in order to accurately determine the low pump speed pumping pressure when gas invasion occurs, in this embodiment, based on the principle that the low pump speed pumping pressure is proportional to the well depth, the accurate low pump speed pumping pressure when gas invasion occurs can be predicted according to the first well parameter data, and then the accurate well control parameter is calculated.
In some embodiments of the present invention, the calculating the low pump speed pump pressure when the gas invasion occurs according to the first well parameter data in the step S120 includes calculating the low pump speed pump pressure when the gas invasion occurs according to the following formula:
wherein P is a low pump speed pump pressure when gas invasion occurs; p (P) v Is a horizontal segmentThe last measured pump pressure with low pump speed; ΔP v Is a correction value; p (P) stable Pumping pressure for low pump speed at a steady slope; l (L) 1 To measure P v Corresponding horizontal well depth (in particular from the point of stable inclination to the measurement P v Horizontal well depth at time); l (L) 2 Is the horizontal well depth measured when the gas intrusion occurs (specifically, the horizontal well depth from the point of stable inclination to the point of occurrence of the gas intrusion).
In some embodiments of the present invention, the step S130 calculates the well control parameter according to the overflow parameter data, the second well parameter data, and the pump pressure with low pump speed when the gas invasion occurs, including calculating the well control parameter according to the following formula:
P initially, the method comprises ＝P+Y；
ρ d ＝ρ l +X/gh；
Wherein P is Initially, the method comprises Is the initial cycle pressure; p is a low pump speed pump pressure when gas intrusion occurs; y is the vertical pressure value of the shut-in wellhead; ρ d Is the density of the well control fluid; ρ l Is the density of the original drilling fluid; x is the overflow quantity; g is the gravity coefficient; h is the vertical depth of the well bore; p (P) Terminal (A) Is the final cycle pressure.
After the gas invasion occurs, the well is shut in and the kill is rapidly organized. Because the horizontal well has a larger contact reservoir area, the gas invasion speed is high, and the well control risk is high, in order to discharge the gas invasion as soon as possible and restore the pressure balance in the well, in some embodiments of the present invention, as shown in fig. 2, the horizontal well is well-controlled by adopting the following method, and the well-controlling method of the horizontal well specifically includes:
s210, determining well control parameters by adopting the method for determining the well control parameters of the horizontal well, wherein the well control parameters comprise initial circulating pressure, final circulating pressure and well control liquid density.
S220, well killing is carried out according to the well killing parameters, and specifically, the well killing process comprises the following steps:
s221, continuously feeding the original liquid into the well drilling in the first well-killing circulation cycle, maintaining the initial circulation pressure unchanged, and meanwhile, configuring the well-killing liquid according to the density of the well-killing liquid. In detail, the gas invasion can be circulated out in the first well control cycle, further worsening of the gas invasion condition is avoided, and time is striven for the configuration of the well control liquid. After the first cycle, the annulus is substantially evacuated of gas-contaminated mud to the same state as the drill pipe, but at this point the well is still overbalanced, and therefore step S222 is required.
And S222, in the second well control circulation period, well control liquid is downwards introduced into the well drilling, and in the process that the well control liquid is downwards introduced into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to the vertical pressure control curve. In detail, the well control fluid is replaced by the original fluid in the second well control cycle period, so that the stratum pressure can be balanced, and the pressure balance in the well can be restored.
In the implementation of step S222, the initial circulation pressure may be reduced to the final circulation pressure according to a conventional vertical pressure control curve of a vertical well that is perpendicular to the horizontal well (as shown in fig. 3A, when the well control fluid is lowered from the drill pipe to the drill bit, the initial circulation pressure is linearly reduced to the final circulation pressure along with the number of strokes corresponding to the volume of the drill pipe). The invention is not limited in this regard.
Further, considering that the borehole trajectories of the vertical well and the horizontal well are different (the vertical well only comprises a vertical section, the horizontal well comprises a vertical section, a deflecting section, a stabilizing section and a horizontal section), in the second well killing cycle period, when the well killing liquid is in descending state, the control change curves of the drill rod pressure are different (when the well killing liquid is in descending state from the drill rod to the drill bit, the initial circulation pressure is completely linearly reduced to the final circulation pressure along with the pump stroke number corresponding to the drill rod volume, and when the well killing liquid is in descending state from the drill rod to the drill bit, the initial circulation pressure is not completely linearly reduced to the final circulation pressure along with the pump stroke number corresponding to the drill rod volume). In the specific implementation, if the initial circulating pressure is reduced to the final circulating pressure according to the conventional vertical pressure control curve of the vertical well, the stratum pressure cannot be quickly and accurately balanced, and the pressure balance in the well is restored. Therefore, in order to solve the technical problem, in some embodiments of the present invention, in the step S222, the vertical pressure control curve is divided into three parts, the first part is from the wellhead to the deflecting point, the second part is from the deflecting point to the slope stabilizing point, and the third part is from the slope stabilizing point to the drill bit. For the first part, as the kill fluid enters, the stand pressure drops rapidly in a straight line from the initial circulating pressure. For the second part, the vertical pressure slowly drops to the final circulating pressure, in the part, the vertical pressure drop is low and related to the vertical depth corresponding to the well control fluid, the vertical pressure drop is fast near the deflecting point, the vertical pressure drop is slow near the slope stabilizing point, and the slope gradually approaches zero. For the third section, the final cycle pressure is maintained constant from the point of stability to the point of bit set-up.
Summarizing, the above-mentioned standing pressure change rule can be represented by a standing pressure control curve (as shown in fig. 3B) shown by the following formula:
d 1 (strokes 1 )＝y 1 ，y 1 ＝c·strokes 1 ；
d 3 (strokes 3 )＝Ly 3 +n，y 3 ＝c·strokes 3 ；
ρ l gH+SIDPP＝p i +ρ d gd i (strokes i )+ρ l g(H-d i (strokes i ))；
wherein d 1 Is the vertical depth of the vertical segment; y is 1 Actually measuring the well depth for the vertical section; d, d 2 Is the vertical depth of the whipstock; k is a constant; r is the radius of curvature; y is 2 Actually measuring the well depth for the deflecting section; d, d 3 Is the vertical depth of the steady inclined section; l is the slope of the steady slope section; y is 3 Actually measuring the well depth for the stable inclined section; n is a constant; c is the well killing displacement; the strokes are the number of pump strokes, are independent variables, and increase along with the descending of the well control fluid; p is p i Is vertical pressure (i.e. vertical pressure in the well killing process);
is the total vertical well depth of the horizontal well; SIDPP is Guan Jingli; ρ l Is the density of the original drilling fluid; ρ d Is the density of the well control fluid; g is the gravity coefficient. In specific implementation, the constants k, n and a are determined by actually designing the borehole track, and the values of the constants are not limited by the invention.
In some embodiments of the present invention, in order to avoid risk, two horizontal well drilling processes are implemented, the well killing displacement corresponding to the two processes is a and B, B < a, and each horizontal well drilling process can obtain a set of first well parameter data, second well parameter data and overflow parameter data, and a set of well killing parameters can be calculated according to each set of first well parameter data, second well parameter data and overflow parameter data.
When specific well killing, well killing is carried out by using well killing parameters corresponding to well killing displacement A, the casing pressure can continuously rise in the process of controlling vertical pressure and circulating gas invasion, and when the casing pressure is about to reach the limit value, an emergency plan is started: and (3) reducing the pump speed, maintaining the initial circulating pressure corresponding to the well control displacement B, and continuously circulating to remove the gas invasion.
The emergency plan provided in this embodiment can achieve the following technical effects: 1) Giving out more reaction time, simultaneously deflating from the well-killing pipeline, injecting well-killing liquid into the throttle pipeline, and avoiding underbalance caused by over-emptying of a shaft; 2) Because the displacement is low and the outlet speed is relatively small, friction and casing pressure can be reduced.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the well control parameters of the horizontal well, as described in the following embodiment. The implementation of the device can be referred to the implementation of the method for determining the well control parameters of the horizontal well, and the repetition is not repeated.
Specifically, as shown in fig. 4, the horizontal well killing parameter determining apparatus 400 includes:
the parameter determining module 410 is configured to obtain first well parameter data, second well parameter data, and overflow parameter data during a horizontal well drilling process, where the first well parameter data includes: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth;
a first calculation module 420 for calculating a low pump speed pump pressure when gas invasion occurs according to the first well parameter data;
and a second calculation module 430, configured to calculate a well control parameter according to the overflow parameter data, the second well parameter data, and the low pump speed pump pressure when the gas invasion occurs.
Specifically, the overflow parameter data according to the present invention at least includes: overflow X, vertical pressure value Y of shut-in wellhead and original drilling fluid density ρ l . The well control parameters include: initial circulating pressure, final circulating pressure and well control fluid density.
In some embodiments of the present invention, the first calculation module 420 calculates the low pump speed pump pressure at which gas intrusion occurs by the following formula:
wherein P is the pumping pressure with low pump speed when gas invasion occurs, P v For the last measured low pump speed of horizontal segment, ΔP v Is the correction value, P stable Pumping for low pump speed at steady slope point, l 1 To measure P v Corresponding horizontal well depth, l 2 Is the horizontal well depth measured when gas flooding occurs.
In some embodiments of the invention, the second calculation module 430 calculates the kill parameter by the following formula:
P initially, the method comprises ＝P+Y；
ρ d ＝ρ l +X/gh；
Wherein P is Initially, the method comprises The initial circulation pressure is set, P is a low pump speed pumping pressure when gas invasion occurs, and Y is a vertical pressure value of a shut-in wellhead;
ρ d is the density, ρ of the well control fluid l The density of the original drilling fluid, X is the overflow quantity, g is the gravity coefficient, and h is the vertical depth of the well bore;
P terminal (A) Is the final cycle pressure.
In some embodiments of the present invention, as shown in fig. 5, a well control system for a horizontal well is further provided, where the present embodiment combines the features of the horizontal well to obtain accurate well control parameters, so that well control for the horizontal well can be performed safely and smoothly.
Specifically, the well control system of the horizontal well comprises: the horizontal well killing parameter determining apparatus 400 according to the foregoing embodiment is configured to determine a killing parameter; and the well control device 500 is used for controlling the well according to the well control parameters.
The well killing process of the well killing device comprises the following steps: continuously feeding original liquid into the well drilling in the first well killing circulation period, maintaining the original circulation pressure unchanged, and meanwhile, configuring well killing liquid according to the density of the well killing liquid; and in the second well killing circulation period, the well killing liquid is downwards fed into the well drilling, and in the process that the well killing liquid is downwards fed into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to the vertical pressure control curve.
In a further embodiment, in order to quickly and accurately balance the bottom pressure and restore the pressure balance in the well, the change rule of the vertical pressure control curve is expressed by the following formula:
d 1 (strokes 1 )＝y 1 ，y 1 ＝c·strokes 1 ；
d 3 (strokes 3 )＝Ly 3 +n，y 3 ＝c·strokes 3 ；
ρ l gH+SIDPP＝p i +ρ d gd i (strokes i )+ρ l g(H-d i (strokes i ) A) is provided; wherein d 1 Is the vertical depth of the vertical segment; y is 1 Actually measuring the well depth for the vertical section; d, d 2 Is the vertical depth of the whipstock; k is a constant; r is the radius of curvature; y is 2 Actually measuring the well depth for the deflecting section; d, d 3 Is the vertical depth of the steady inclined section; l is the slope of the steady slope section; y is 3 Actually measuring the well depth for the stable inclined section; n is a constant; c is the well killing displacement; the strokes are the number of pump strokes, are independent variables, and increase along with the descending of the well control fluid; p is p i Is vertical pressure;
is the total vertical well depth of the horizontal well; SIDPP is Guan Jingli; ρ l Is the density of the original drilling fluid; ρ d Is the density of the well control fluid; g is the gravity coefficient.
In some embodiments of the present invention, a computer device is further provided, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the method for determining a well killing parameter of a horizontal well according to any one of the foregoing embodiments when executing the computer program.
In some embodiments of the present invention, a computer readable storage medium is provided, where a computer program is stored for executing a method for determining a horizontal well killing parameter according to any one of the previous embodiments when the computer program is executed by a processor.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the purpose of illustrating the technical solution of the present invention, and any person skilled in the art may modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the invention should be considered as the scope of the claims.
Claims (12)
1. A method for determining a well killing parameter of a horizontal well, comprising:
acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process, wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding level of timeWell depth, horizontal well depth when gas invasion occurs, the second well parameter data including wellbore vertical depth;
calculating a low pump speed pump pressure when gas invasion occurs according to the first well parameter data;
calculating well control parameters according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs;
calculating a low pump speed pump pressure when gas invasion occurs according to the first well parameter data, wherein the low pump speed pump pressure when gas invasion occurs is calculated through the following formula:
wherein P is a low pump speed pump pressure when gas invasion occurs; p (P) v Pumping for the last measured low pump speed of the horizontal segment; ΔP v Is a correction value; p (P) stable Pumping pressure for low pump speed at a steady slope; l (L) 1 To measure P v Corresponding horizontal well depth; l (L) 2 Is the horizontal well depth measured when gas flooding occurs.
2. The method of claim 1, wherein the overflow parameter data comprises: overflow X, vertical pressure value Y of shut-in wellhead and original drilling fluid density ρ l 。
3. The method of claim 2, wherein the kill parameter comprises: initial circulating pressure, final circulating pressure and well control fluid density.
4. A method as claimed in claim 3, wherein calculating a well control parameter from the overflow parameter data, the second well parameter data and the low pump speed pump pressure at which gas flooding occurs comprises calculating the well control parameter by the formula:
P initially, the method comprises ＝P+Y；
ρ d ＝ρ l +Xgh；
Wherein P is Initially, the method comprises Is the initial cycle pressure; p is a low pump speed pump pressure when gas intrusion occurs; y is the vertical pressure value of the shut-in wellhead;
ρ d is the density of the well control fluid; ρ l Is the density of the original drilling fluid; x is the overflow quantity; g is the gravity coefficient; h is the vertical depth of the well bore;
P terminal (A) Is the final cycle pressure.
5. A method of killing a horizontal well, comprising:
determining a kill parameter according to the method of claim 3 or 4;
and carrying out well killing according to the well killing parameters, wherein the well killing process comprises the following steps:
continuously feeding original liquid into the well drilling in the first well killing circulation period, maintaining the original circulation pressure unchanged, and meanwhile, configuring well killing liquid according to the density of the well killing liquid;
in the second well killing circulation period, the well killing liquid is downwards put into the well drilling, and in the process that the well killing liquid is downwards put into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to a vertical pressure control curve;
the change rule of the vertical pressure control curve is expressed by the following formula:
d 1 (strokes 1 )＝y 1 ，y 1 ＝c·strokes 1 ；
d 3 (strokes 3 )＝Ly 3 +n，y 3 ＝c·strokes 3 ；
ρ l g H+SIDPP＝p i +ρ d gd i (strokes i )+ρ l g(H-d i (strokes i ))；
wherein d 1 Is the vertical depth of the vertical segment; y is 1 Actually measuring the well depth for the vertical section; d, d 2 Is the vertical depth of the whipstock; k is a constant; r is the radius of curvature; y is 2 Actually measuring the well depth for the deflecting section; d, d 3 Is the vertical depth of the steady inclined section; l is the slope of the steady slope section; y is 3 Actually measuring the well depth for the stable inclined section; n is a constant; c is the well killing displacement; strokes i (i=1, 2, 3) is the number of pump strokes, is an independent variable, and increases as the well control fluid decreases; p is p i Is vertical pressure;
is the total vertical well depth of the horizontal well; SIDPP is Guan Jingli; ρ l Is the density of the original drilling fluid; ρ d Is the density of the well control fluid; g is the gravity coefficient.
6. A horizontal well kill parameter determining apparatus, comprising:
the parameter determining module is used for acquiring first well parameter data, second well parameter data and overflow parameter data in the horizontal well drilling process, wherein the first well parameter data comprises: low pump speed pump pressure at stable point and low pump speed pump pressure P measured last time in horizontal section v Measurement of P v Corresponding horizontal well depth when gas invasion occurs, and the second well parameter data comprise well hole vertical depth;
the first calculation module is used for calculating a low pump speed pumping pressure when gas invasion occurs according to the first well parameter data;
the second calculation module is used for calculating the well control parameter according to the overflow parameter data, the second well parameter data and the low pump speed pumping pressure when gas invasion occurs;
the first calculation module calculates a low pump speed pump pressure when gas invasion occurs according to the following formula:
wherein P is a low pump speed pump pressure when gas invasion occurs; p (P) v Pumping for the last measured low pump speed of the horizontal segment; ΔP v Is a correction value; p (P) stable Pumping pressure for low pump speed at a steady slope; l (L) 1 To measure P v Corresponding horizontal well depth, l 2 Is the horizontal well depth measured when gas flooding occurs.
7. The apparatus of claim 6, wherein the overflow parameter data comprises: overflow X, vertical pressure value Y of shut-in wellhead and original drilling fluid density ρ l 。
8. The apparatus of claim 7, wherein the kill parameter comprises: initial circulating pressure, final circulating pressure and well control fluid density.
9. The apparatus of claim 8, wherein the second calculation module calculates the kill parameter by:
P initially, the method comprises ＝P+Y；
ρ d ＝ρ l +X/gh；
Wherein P is Initially, the method comprises Is the initial cycle pressure; p is a low pump speed pump pressure when gas intrusion occurs; y is the vertical pressure value of the shut-in wellhead;
ρ d is the density of the well control fluid; ρ l Is the density of the original drilling fluid; x is the overflow quantity; g is the gravity coefficient; h is the vertical depth of the well bore;
P terminal (A) Is the final cycle pressure.
10. A well control system for a horizontal well, comprising:
the horizontal well killing parameter determining apparatus according to claim 8 or 9, for determining a killing parameter;
the well control device is used for controlling the well according to the well control parameters, and the well control process comprises the following steps:
continuously feeding original liquid into the well drilling in the first well killing circulation period, maintaining the original circulation pressure unchanged, and meanwhile, configuring well killing liquid according to the density of the well killing liquid;
in the second well killing circulation period, the well killing liquid is downwards put into the well drilling, and in the process that the well killing liquid is downwards put into the drill bit from the drill rod, the initial circulation pressure is reduced to the final circulation pressure according to a vertical pressure control curve;
the change rule of the vertical pressure control curve is expressed by the following formula:
d 1 (strokes 1 )＝y 1 ，y 1 ＝c·strokes 1 ；
d 3 (strokes 3 )＝Ly 3 +n，y 3 ＝c·strokes 3 ；
ρ l g H+SIDPP＝p i +ρ d gd i (strokes i )+ρ l g(H-d i (strokes i ) A) is provided; wherein d 1 Is the vertical depth of the vertical segment; y is 1 Actually measuring the well depth for the vertical section; d, d 2 Is the vertical depth of the whipstock; k is a constant; r is the radius of curvature; y is 2 Actually measuring the well depth for the deflecting section; d, d 3 Is the vertical depth of the steady inclined section; l is the slope of the steady slope section; y is 3 Actually measuring the well depth for the stable inclined section; n is a constant; c is the well killing displacement; the strokes are the number of pump strokes, are independent variables, and increase along with the descending of the well control fluid; p is p i Is vertical pressure;
is the total vertical well depth of the horizontal well; SIDPP is Guan Jingli; ρ l Is the density of the original drilling fluid; ρ d Is the density of the well control fluid; g is the gravity coefficient.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 4 when executing the computer program.
12. A computer readable storage medium, characterized in that the computer readable storage medium stores an executing computer program, which when executed by a processor implements the method of any of claims 1 to 4.
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| US7908034B2 (en) * | 2005-07-01 | 2011-03-15 | Board Of Regents, The University Of Texas System | System, program products, and methods for controlling drilling fluid parameters |
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