CN114017000B - Method for judging adaptation of pushing-leaning rotary guiding system to stratum drilling - Google Patents
Method for judging adaptation of pushing-leaning rotary guiding system to stratum drilling Download PDFInfo
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Abstract
The invention discloses a method for judging adaptation of a push-against rotary guiding system to drilling a stratum, which belongs to the technical field of petroleum drilling and is characterized by comprising the following steps of: a. establishing dynamic Young's modulus E d And static Young's modulus E s A relationship between; b. calculating the stress p of the rib acting on the unit area of the well wall contact surface c The method comprises the steps of carrying out a first treatment on the surface of the c. Calculating the deformation delta of the well wall; d. when delta is more than or equal to delta, the deformation of the well wall after the rib of the pushing type rotary guiding system pushes against the well wall is smaller than that of the rib, and the working state of the pushing type rotary guiding system is judged to be normal; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is judged to be abnormal. The invention has the characteristics of convenient and fast data acquisition, continuous data, short test time consumption and convenient operation.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a method for judging adaptation of a push-against rotary guiding system to drilling stratum.
Background
With the progress of drilling technology, the lower drilling tool combination aiming at controlling the experience track is developed rapidly, and on the basis of the original common inclination increasing, inclination decreasing and inclination stabilizing drilling tools, various types of guiding drilling tools, such as an inclination preventing drilling tool with an eccentric elbow joint, an inclination preventing drilling tool with a flexible joint, an inclination increasing drilling tool with variable rigidity between two stabilizers and the like, are developed and popularized. Various rotary steerable drilling tools have been developed internationally, and the push-against rotary steerable drilling tools are based on conventional rotary drilling tools, which are rotated to stabilize the drill string in a desired position in the borehole section during rotation by rotating a near-bit stabilizer to control the borehole trajectory.
The pushing rotary guiding system extends out of the rib through the hydraulic action in the system to enable the rib to be pushed to contact with the position required by the section of the well bore, so that the required lateral cutting force is provided for the drill bit, and the regulation and control of the well bore track are realized. However, after the rib is pushed against the well wall, the well wall rock is required to provide enough reaction force to maintain the distance between the rotary guiding system body and the well wall, if the intensity of stratum rock is insufficient to overcome the pushing force of the rib pushing against the well wall, the well wall rock will deform to cause the rib to sink into the well wall, at this time, the distance between the rotary guiding system body and the well wall is reduced to cause insufficient lateral cutting force required by the drill bit, and further, the well track is failed to regulate or cannot reach the expectations, but a similar stratum adaptation evaluation method does not exist for the push-against rotary guiding system at present.
The Chinese patent document with publication number of CN 111502649A and publication date of 2020, 08 and 07 discloses a stratum adaptation evaluation method of a push-back type rotary guide system, which is characterized in that: the method comprises the following steps:
A. the formation compressive strength obtaining step: collecting a downhole core of a stratum in a drilled well section, and performing compressive strength compression test on the collected downhole core to obtain compressive strength sigma c of the stratum;
B. the pressure of the rib acting on the well wall contact surface is obtained by the steps of: obtaining pressure pc of the rib acting on the well wall contact surface according to the maximum pushing force P of the rib of the pushing rotary guide system and the contact area A of the rib and the well wall;
C. and (3) adaptability evaluation: comparing the actual build rate K1 and the designed build rate K0 of the drilled section, when K1 is more than or equal to K0, indicating that the push-back rotary guiding system is suitable for the stratum of the drilled section, recording the ratio n=pc/sigma c of the pressure pc of the wing rib acting on the contact surface of the well wall and the compressive strength sigma c of the stratum, taking the value n as the standard reference value of the push-back rotary guiding system for adapting to the stratum of the well section, and sequentially obtaining n values of different stratum to establish a stratum adaptability evaluation database.
According to the stratum adaptation evaluation method of the push-type rotary guide system disclosed by the patent document, underground rock cores of drilled well segments are required to be collected, the underground rock cores are processed and manufactured into cylindrical test samples with the diameter of 25mm and the length of 50mm, two ends of each test sample are ground to be flat, the number of required test samples is not less than 3, an average value of compressive strength of each test sample is obtained through development tests and is used as the compressive strength of the stratum, then the ratio of the pressure intensity of a rib acting on a well wall contact surface to the compressive strength of the stratum is compared, and the ratio of different strata is sequentially obtained to establish a stratum adaptation evaluation database.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for judging that the push-type rotary guiding system is suitable for drilling a stratum.
The invention is realized by the following technical scheme:
a method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the dynamic Young modulus Ed of the stratum of the drilling well section is obtained by calculating by using a pushing type rotary guiding system and using the stratum transverse wave time difference, the stratum longitudinal wave time difference and the stratum volume density of the well section, and the dynamic Young modulus E is established d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, the full contact area A of the wing rib and the well wall and the maximum travel delta of the wing rib, and calculating the stress P of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
In the step a, a dynamic Young's modulus E is established d And static Young's modulus E s The relation between the Young's modulus E and the Young's modulus E is obtained by the formula 2 d And static Young's modulus E s A relationship between;
E s ＝a·E s +b type 2
Wherein E is s For static Young's modulus, a and b are both fitting parameters.
In the step b, the stress p of the rib acting on the unit area of the well wall contact surface is calculated c Is determined by the calculation of formula 3;
wherein p is c The unit area stress of the rib acting on the well wall contact surface is P, the maximum pushing force of the rib of the pushing unit is P, and a is the complete contact area of the rib and the well wall.
In the step c, calculating the borehole wall deformation delta means determining the borehole wall deformation delta through the calculation of the formula 5;
delta=εr 5
Wherein delta is the deformation of the well wall, epsilon is the deformation strain of the rib pushing against the well wall, and R is the radius of the well.
In the step b, the maximum pushing force P of the wing rib of the pushing unit, the area A of the wing rib in full contact with the well wall and the maximum travel delta of the wing rib are determined through the structural parameters of the pushing rotary guiding system.
The structural parameters of the push-type rotary guiding system are rated parameters of the push-type rotary guiding system.
The nominal parameter is the pushing force.
The nominal parameter is the maximum travel.
The nominal parameter is the contact area.
In said step a, the static Young's modulus E s Determined by rock mechanical parameter testing of the corresponding well Duan Deceng.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention, a, establishes dynamic Young's modulus E d And static Young's modulus E s A relationship between; b. calculating the stress p of the rib acting on the unit area of the well wall contact surface c The method comprises the steps of carrying out a first treatment on the surface of the c. Calculating the deformation delta of the well wall; d. when delta is more than or equal to delta, the deformation of the well wall after the rib of the pushing type rotary guiding system pushes against the well wall is smaller than that of the rib, and the working state of the pushing type rotary guiding system is judged to be normal; when delta is less than delta, after the rib of the pushing rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing rotary guiding system is judged to be abnormal; as a complete technical scheme, compared with the prior art, the method has the characteristics of convenience in acquiring data, continuity in data, short test time and convenience in operation.
2. In the step b, the stress p of the unit area of the contact surface of the well wall acted by the rib is calculated c The method is used for determining the working output parameters of the rotary guiding system, and is convenient for guaranteeing the subsequent analysis technical effect.
3. In the step c, the contact relation between the pushing rotary guiding system and the well wall in the working state can be obtained by calculating the well wall deformation delta.
4. The whole judging method is simple and feasible, and not only can obtain the continuous working state analysis result of the application well section, but also can adjust the pushing type rotary guiding rib stroke in real time.
Detailed Description
Example 1
A method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the formation transverse wave time difference, the formation longitudinal wave time difference and the formation volume density of the well section are applied by the pushing type rotary guiding system, and the calculation is carried out by adopting the formula 1Dynamic Young's modulus Ed of formation of drilling-in section, and establishing dynamic Young's modulus E d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, the full contact area A of the wing rib and the well wall and the maximum travel delta of the wing rib, and calculating the stress P of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
This example is the most basic embodiment, a, establishing dynamic Young's modulus E d And static Young's modulus E s A relationship between; b. calculating rib actionStress p per unit area of borehole wall contact surface c The method comprises the steps of carrying out a first treatment on the surface of the c. Calculating the deformation delta of the well wall; d. when delta is more than or equal to delta, the deformation of the well wall after the rib of the pushing type rotary guiding system pushes against the well wall is smaller than that of the rib, and the working state of the pushing type rotary guiding system is judged to be normal; when delta is less than delta, after the rib of the pushing rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing rotary guiding system is judged to be abnormal; as a complete technical scheme, compared with the prior art, the method has the characteristics of convenience in acquiring data, continuity in data, short test time and convenience in operation.
Example 2
A method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the dynamic Young modulus Ed of the stratum of the drilling well section is obtained by calculating by using a pushing type rotary guiding system and using the stratum transverse wave time difference, the stratum longitudinal wave time difference and the stratum volume density of the well section, and the dynamic Young modulus E is established d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, the full contact area A of the wing rib and the well wall and the maximum travel delta of the wing rib, and calculating the stress P of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
In the step a, a dynamic Young's modulus E is established d And static Young's modulus E s The relation between the Young's modulus E and the Young's modulus E is obtained by the formula 2 d And static Young's modulus E s A relationship between;
E s ＝a·E s +b type 2
Wherein E is s For static Young's modulus, a and b are both fitting parameters.
In step b, the stress p of the rib acting on the unit area of the contact surface of the well wall is calculated c The method is used for determining the working output parameters of the rotary guiding system, and is convenient for guaranteeing the subsequent analysis technical effect.
Example 3
A method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the dynamic Young modulus Ed of the stratum of the drilling well section is obtained by calculating by using a pushing type rotary guiding system and using the stratum transverse wave time difference, the stratum longitudinal wave time difference and the stratum volume density of the well section, and the dynamic Young modulus E is established d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, the full contact area A of the wing rib and the well wall and the maximum travel delta of the wing rib, and calculating the stress P of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
In the step a, a dynamic Young's modulus E is established d And static Young's modulus E s The relation between the Young's modulus E and the Young's modulus E is obtained by the formula 2 d And static Young's modulus E s A relationship between;
E s ＝a·E s +b type 2
Wherein E is s For static Young's modulus, a and b are both fitting parameters.
In the step b, calculatingStress p of rib acting on unit area of well wall contact surface c Is determined by the calculation of formula 3;
wherein p is c The unit area stress of the rib acting on the well wall contact surface is P, the maximum pushing force of the rib of the pushing unit is P, and a is the complete contact area of the rib and the well wall.
In the embodiment, in the step c, the deformation delta of the well wall is calculated, so that the contact relation between the pushing-type rotary guiding system and the well wall in the working state can be obtained.
Example 4
A method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the dynamic Young modulus Ed of the stratum of the drilling well section is obtained by calculating by using a pushing type rotary guiding system and using the stratum transverse wave time difference, the stratum longitudinal wave time difference and the stratum volume density of the well section, and the dynamic Young modulus E is established d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, the full contact area A of the wing rib and the well wall and the maximum travel delta of the wing rib, and calculating the stress P of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
In the step a, a dynamic Young's modulus E is established d And static Young's modulus E s The relation between the Young's modulus E and the Young's modulus E is obtained by the formula 2 d And static Young's modulus E s A relationship between;
E s ＝a·E s +b type 2
Wherein E is s For static Young's modulus, a and b are both fitting parameters.
In the step b, the stress p of the rib acting on the unit area of the well wall contact surface is calculated c Is determined by the calculation of formula 3;
wherein p is c The unit area stress of the rib acting on the well wall contact surface is P, the maximum pushing force of the rib of the pushing unit is P, and a is the complete contact area of the rib and the well wall.
In the step c, calculating the borehole wall deformation delta means determining the borehole wall deformation delta through the calculation of the formula 5;
delta=εr 5
Wherein delta is the deformation of the well wall, epsilon is the deformation strain of the rib pushing against the well wall, and R is the radius of the well.
In the step b, the maximum pushing force P of the wing rib of the pushing unit, the area A of the wing rib in full contact with the well wall and the maximum travel delta of the wing rib are determined through the structural parameters of the pushing rotary guiding system.
The structural parameters of the push-type rotary guiding system are rated parameters of the push-type rotary guiding system.
The nominal parameter is the pushing force.
The nominal parameter is the maximum travel.
The nominal parameter is the contact area.
In said step a, the static Young's modulus E s Determined by rock mechanical parameter testing of the corresponding well Duan Deceng.
The embodiment is an optimal implementation mode, the whole judging method is simple and easy to implement, and not only can obtain the continuous working state analysis result of the application well section, but also can adjust the pushing-leaning rotary guiding wing rib stroke in real time.
Claims (10)
1. A method of determining that a push-against rotary steerable system is adapted to drill a formation, comprising the steps of:
a. the dynamic Young modulus Ed of the stratum of the drilling well section is obtained by calculating by using a pushing type rotary guiding system and using the stratum transverse wave time difference, the stratum longitudinal wave time difference and the stratum volume density of the well section, and the dynamic Young modulus E is established d And static Young's modulus E s A relationship between;
wherein Δt is s For formation transverse wave time difference, deltat p Is the formation longitudinal wave time difference, ρ is the formation volume density, E d Is dynamic Young's modulus;
b. determining the maximum pushing force P of the wing rib of the pushing unit, and the wing rib and the well wallThe total contact area A and the maximum travel delta of the wing rib calculate the stress p of the wing rib acting on the unit area of the contact surface of the well wall c ；
c. Obtaining the stress p of the rib acting on the unit area of the well wall contact surface by utilizing the elastic mechanical stress-strain relation c The relation between the deformation strain epsilon of the wing rib pushing against the well wall and the deformation strain epsilon of the well wall is calculated;
wherein epsilon is deformation strain of the rib pushing against the well wall, p c Stress applied to unit area of the contact surface of the well wall by the wing ribs E s Is static Young's modulus;
d. judging the working state of the pushing type rotary guiding system according to the relation between the deformation delta of the well wall and the maximum travel delta of the wing rib, and judging that the working state of the pushing type rotary guiding system is normal and suitable for a drilled stratum when the deformation delta is more than or equal to delta and the deformation of the well wall is smaller than that of the wing rib after the wing rib of the pushing type rotary guiding system pushes against the well wall; when delta is less than delta, after the rib of the pushing type rotary guiding system pushes against the well wall, the deformation of the well wall is greater than that of the rib, and the working state of the pushing type rotary guiding system is abnormal and is not suitable for the drilled stratum.
2. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, wherein: in the step a, a dynamic Young's modulus E is established d And static Young's modulus E s The relation between the Young's modulus E and the Young's modulus E is obtained by the formula 2 d And static Young's modulus E s A relationship between;
E s ＝a·E s +b type 2
Wherein E is s For static Young's modulus, a and b are both fitting parameters.
3. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, whereinThe method comprises the following steps: in the step b, the stress p of the rib acting on the unit area of the well wall contact surface is calculated c Is determined by the calculation of formula 3;
wherein p is c The unit area stress of the rib acting on the well wall contact surface is P, the maximum pushing force of the rib of the pushing unit is P, and a is the complete contact area of the rib and the well wall.
4. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, wherein: in the step c, calculating the borehole wall deformation delta means determining the borehole wall deformation delta through the calculation of the formula 5;
delta=εr 5
Wherein delta is the deformation of the well wall, epsilon is the deformation strain of the rib pushing against the well wall, and R is the radius of the well.
5. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, wherein: in the step b, the maximum pushing force P of the wing rib of the pushing unit, the area A of the wing rib in full contact with the well wall and the maximum travel delta of the wing rib are determined through the structural parameters of the pushing rotary guiding system.
6. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, wherein: the structural parameters of the push-type rotary guiding system are rated parameters of the push-type rotary guiding system.
7. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 5, wherein: the nominal parameter is the pushing force.
8. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 5, wherein: the nominal parameter is the maximum travel.
9. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 5, wherein: the nominal parameter is the contact area.
10. A method of determining the suitability of a push-against rotary steerable system for drilling a subterranean formation according to claim 1, wherein: in said step a, the static Young's modulus E s Determined by rock mechanical parameter testing of the corresponding well Duan Deceng.
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