CN1219638A - Lower drilling rig combination and its drilling method - Google Patents
Lower drilling rig combination and its drilling method Download PDFInfo
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- CN1219638A CN1219638A CN 97121899 CN97121899A CN1219638A CN 1219638 A CN1219638 A CN 1219638A CN 97121899 CN97121899 CN 97121899 CN 97121899 A CN97121899 A CN 97121899A CN 1219638 A CN1219638 A CN 1219638A
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Abstract
A down-hole drill set is composed of several drill tappets one off-axis joint and one drill bit. The distance between the central axis of slurry channel coaxial with internal taper thread and the central axis of slurry channel coaxial with external taper thread is 5-38 mm. The distance between lower limiting end face of the main body of off-axis joint and the upper limiting end face of drill bit is 6-12m. Their accurate values are determined based on chosen drill bit size, external radius of drill collar, drilling pressure and rotation speed. When said down-hole drill set is used to drill well, the well tilt can be avoided and corrected.
Description
The present invention relates to bottomhole assembly and boring method thereof that a kind of drilling well is used.
Suddenly construct regional drilling well at height and the hole deviation problem often occurs.For reducing hole deviation, drilling well circle both at home and abroad often adopts ground to move well location, packed hole assembly, pendulum assembly, tower drilling assembly and eccentric drilling device combination (comprise indent drill collar, the asymmetric drill collar of rigidity) method such as, though these methods have certain effect to the control hole deviation, anti-oblique DeGrain.Adopt more pendulum assembly in drilling process, will reduce the pressure of the drill at present, reduced mechanical separator speed, thereby reduced drilling benefit, increased drilling cost.
China's utility model patent discloses a kind of " bit adapter under the multifunctional well " for No. 902016938.This bit adapter is direct and drill bit links together, and its main body is on one, and the eccentric joint of following decentraction is equipped with the cardiac component that prevents that mud from overflowing in the main body.Have certain anti-tiltedly effect though the drilling tool of this bit adapter is equipped with in use, its anti-oblique principle is to lean on the centrifugal force of eccentric mass to reach hold angle.Because joint is to be directly installed on the drill bit, drill bit is again a fulcrum, and the inertia force of joint eccentric mass directly is added on the drill bit fulcrum, and this power can't make drill collar form stable revolution and rotatablely move by being transformed into revolution certainly, drill bit is evenly cut around the borehole wall, realize hold angle.
The objective of the invention is to overcome the shortcoming of above-mentioned known drilling assembly and boring method, provide a kind of can hold angle in 0-6 ° of hole angle scope, well straightening, bottomhole assembly that again can rapid drilling and use the boring method of this drilling assembly.
Bottomhole assembly of the present invention, comprise some drill collars, main part is eccentric shaft connection and drill bit that slurry channel is arranged in cylindrical, the top of described eccentric shaft connection is provided with the inside tapered thread that is connected with the drill collar that is positioned at its upper end, the bottom is provided with the outer cone thread that is connected with the drill collar that is positioned at its lower end, be parallel to each other with the axis of the coaxial slurry channel of inside tapered thread with the axis of the axis of the coaxial slurry channel of outer cone thread and main part and lay respectively at its both sides, and the axis of the slurry channel that inside tapered thread is coaxial and and the axis of the coaxial slurry channel of outer cone thread between distance be 5～38 millimeters, the distance between the lower limit end face of described eccentric shaft connection main part and the described drill bit upper limit end face is 6～12 meters.
Bottomhole assembly of the present invention, in its eccentric shaft connection and the axis coaxial slurry channel of inside tapered thread and preferably equate with the axis of the coaxial slurry channel of outer cone thread distance apart from the axis of described main part.
A kind of boring method that uses above-mentioned bottomhole assembly comprises the following steps:
1, according to formation characteristics, casing programme is selected the rock bit of different model;
2, select the lower end drill collar according to bite type and existing drill collar model;
3, the listed parameters relationship of according to the form below, determine the off-axis distance of eccentric shaft connection and the distance of eccentric shaft connection lower limit tip to face distance drill bit upper limit end face according to selected bit size, drill collar external diameter, the pressure of the drill, rotary speed:
The eccentric shaft connection lower limit
Position tip to face distance bit drills area of bed off-axis is apart from drill collar external diameter the pressure of the drill rotary speed of upper limit end face
Distance (mm) is (m) (mm) (KN) (rpm) 165.1 88.9 to 152 80 to 200 (61/2 '), 444.5 216 to 254 140 to 250 (171/2 ') 311.2 216 to 228 120 to 240 (122/8 ') 50 to 150215.9 5 to 38 6 to 12 127 to 203 100 to 220 (81/2 ') (mm)
4, determine the upper end drill collar according to selected bite type, eccentric shaft connection and lower end drill collar size;
5, select high rotary speed drilling well for use by existing drilling technology process.
Bottomhole assembly of the present invention is owing to be equipped with eccentric shaft connection between drill collar, the upper end drill collar axis under free state in the bottomhole assembly and lower end drill collar axis keeping parallelism, but remove a segment distance (being the off-axis distance of eccentric shaft connection) mutually.After at the bottom of the drilling assembly lower going-into-well of bottom, be subjected to the restriction of well limit, under the effect of the pressure of the drill, will produce a moment of flexure at the eccentric shaft connection place.This moment of flexure makes drilling assembly form a stable arc flexural deformation, as shown in Figure 3.The rotation of rotating disk makes bottomhole assembly form stable revolution in the shaft bottom to circle round during work, and meanwhile, drill bit bears bigger rotation lateral force, and drill bit is evenly cut around the borehole wall, reaches hold angle; Bottomhole assembly of the present invention has very strong ability placed in the middle when work simultaneously, guaranteed that eccentric shaft connection does not contact with the borehole wall, as drilling well the pressure of the drill is controlled in the table scope, can make on the contact point of the drill string on eccentric shaft connection top and the borehole wall and move, make the drop angle power on the drill bit reach maximum, thereby realize the purpose of well straightening.When using bottomhole assembly drilling well of the present invention, can use higher the pressure of the drill and drilling speed, thereby improve the mechanical separator speed of drilling well, realized anti-tiltedly with play fast unification.Use bottomhole assembly drilling well of the present invention that hole angle is remained within 0～6 ° of scope, compare with common drilling tool, average drilling speed can improve more than 1 times.
Other details of bottomhole assembly of the present invention and characteristics can be cheer and bright by reading the embodiment hereinafter encyclopaedize in conjunction with the accompanying drawings, wherein:
Fig. 1 is a bottomhole assembly structural representation of the present invention;
Fig. 2 is the structural representation of the eccentric shaft connection in the bottomhole assembly structure of the present invention;
Fig. 3 is a bottomhole assembly working state schematic representation of the present invention;
Fig. 4 hole angle curve map that to be bottomhole assembly of the present invention use at Jiangsu well (171/2 " well).
With reference to Fig. 1. Bottomhole assembly of the present invention comprises some drill collars 1, eccentric shaft connection 2 and drill bit 3.
With reference to Fig. 2. Fig. 2 is the structural representation of eccentric shaft connection shown in Figure 1. The main part of eccentric shaft connection 2 Be a cylinder 21, all be processed with inside tapered thread 22 on it, be used for being connected with the drill collar 11 that is located thereon end. The bottom is provided with outer cone thread 23, is used for linking to each other with the drill collar 12 that is positioned at its lower end. Coaxial with inside tapered thread 22 The axis 25 of slurry channel 24 and with the axis 27 of the coaxial slurry channel 26 of outer cone thread 23 with The axis 28 of main part 21 is parallel to each other and lays respectively at its both sides. Between the axis 25 and 27 Distance can be chosen wantonly between 5～38 millimeters. Axis 25 and 27 preferably is arranged in main part equidistantly The both sides of the axis 28 of dividing. The lower limit end face of eccentric shaft connection main part represents with numeral 29.
Refer again to Fig. 1 and Fig. 2. Eccentric shaft connection 2 will make the lower limit end face of eccentric shaft connection main part when mounted 29 and the distance of the upper limit end face 31 of drill bit 3 be controlled between 6～12 meters.
The drill bit of bottomhole assembly of the present invention can be according to formation characteristics, and casing programme is selected dissimilar rock bit; The lower end drill collar is determined according to bite type and existing drill collar model; The upper end drill collar is by bite type, and bore eccentric shaft connection and lower end Quickly determine; The off-axis distance of eccentric shaft connection and installation site are by bit diameter, drill collar size, and the pressure of the drill size and rotary speed are true Fixed, but the given relation of its numerical value according to the form below is chosen:
The eccentric shaft connection lower limit
Position tip to face distance bit drills area of bed off-axis is reported apart from drill collar external diameter the pressure of the drill rotating disk of upper limit end face
Distance (mm) is (m) (mm) (KN) (rpm) 165.1 88.9 to 152 80 to 200 (61/2 '), 444.5 216 to 254 140 to 250 (171/2 ') 311.2 216 to 228 120 to 240 (122/8 ') 50 to 150 215.9 5 to 38 6 to 12 127 to 203 100 to 220 (81/2 ') (mm)
Generally speaking, when the pressure of the drill, rotary speed are chosen high value, the off-axis distance of eccentric shaft connection, eccentric shaft connection lower limit The length of tip to face distance drill bit upper limit end face should be got low value; Vice versa.
When bottomhole assembly of the present invention is limited in working in the well, be subjected to simultaneously dynamic axial force, cross force, curved Square, and the synergy of moment of torsion, its motion state is very complicated, is a uncertain whirling motion system. The off-axis bottom The stress of the BHA characteristics of motion and drill bit is by off-axis distance and the installation site of bit diameter, eccentric shaft connection, drill collar Size, the pressure of the drill size, rotary speed, hole angle and stratum are held the factor such as levy and are determined.
Upper table is to study for many years through the inventor, analytical calculation and through actual tests preferred after draw this area general Logical technical staff realizes anti-oblique fast beating as long as be easy to therefrom select suitable parameter according to the actual well drilled condition.
With reference to Fig. 3. Fig. 3 is bottomhole assembly working state schematic representation of the present invention. Bottomhole assembly of the present invention In free state, eccentric shaft connection upper end drill collar axis and lower end drill collar axis are parallel to each other, but mutually remove a segment distance, As shown in Figure 1. After at the bottom of the drilling tool lower going-into-well, be subjected to the restriction of well, under the pressure of the drill effect, produce one at the eccentric shaft connection place Moment of flexure makes BHA form stable flexural deformation, as shown in FIG. arc. During work, the rotation of rotating disk makes down Section's BHA forms stable revolution convolution in the shaft bottom, as shown by arrows in FIG.. Drill bit bears bigger rotation side direction Power is evenly cut around the borehole wall drill bit, reaches hold angle; On business turning to again than rotation has very strong ability placed in the middle, thereby protects The card eccentric shaft connection does not contact with the borehole wall, allows move the realization well straightening on the contact point of drill string and the borehole wall.
Be the concrete application example of bottomhole assembly of the present invention below: example 1: in the application of Jiangsu well (171/2 " well)
This well location geological conditions is very complicated, higher formation clination and changeable, and tomography is many, and the interlayer segment length is glued fine and close hard, very easily produces hole deviation, has a strong impact on drilling efficiency.
This well initial stage of spudding in adopts conventional anti-oblique measure to drill.Creep into packed hole assembly from 101m to 356m, hole angle is very fast to be increased to 3.15 ° from 0 °.Used two cover pendulum drilling tool well straightenings subsequently, the pressure of the drill generally adopts about 80KN and hangs up and beats in the well straightening process.In 630m～707m well section, hole angle is from 1.9 ° of surges to 9.25 °.When being drilled into the 1175m well depth, hole angle still has 4.25 °.In the well section of 1145m, average rate of penetration is about 1m/hr.When the most serious, just crept into 1m in more than 3 hour.At the characteristics of this well, the inventor improves design to the pendulum combination of original employing.The 1155m that is combined in after the improvement goes into the well (this moment, hole angle was 4.25 °), and when being drilled into 1259.9m, hole angle is reduced to 1.75 ° rapidly.
Locate to have adopted bottomhole assembly technology of the present invention at 1259.9m (this moment, hole angle was 1.75 °).The off-axis of the eccentric shaft connection of this bottomhole assembly is apart from getting 32mm, and the distance of eccentric shaft connection lower limit tip to face distance drill bit upper limit end face is 9m, and rotary speed is 60rpm.The pressure of the drill is added to 180～200KN earlier, and hole angle is stabilized in 1.75 °, and rate of penetration is brought up to 2.7m/hr.In 1377m to 1416m well section, the pressure of the drill is added to 200～220KN ton, and hole angle is reduced to 1.25 ° from 1.75 °, and rate of penetration is brought up to 3.0m/hr.In 1416m to 1463m well section, the pressure of the drill adds to 220～230KN, and hole angle is reduced to 0.5 ° from 1.25 °, and it is many that rate of penetration is brought up to 3.0m/hr.As seen, this new technology is increased to 230KN with the pressure of the drill from original 80KN, and anti-oblique well straightening effect is quite obvious, and rate of penetration increases significantly.Real drilling well section surpasses 500m, and hole angle is controlled at 1.75 ° with interior (see figure 4), and temporal ROP has improved nearly 2 times, and average drilling speed has improved 1.04 times.Example 2: in the application of Sichuan well (121/4 " well)
The hole deviation phenomenon very easily takes place at 53 ° at this oblique angle, stratum, well location, makes and has to take in the wellbore construction process: well location is moved on (1) ground; (2) decompression is hung up and beaten; (3) repeatedly measure such as well straightening, bit speed is slow.
The top well section of this well (＜1415m), adopt tower drilling tool to creep into, used the pressure of the drill is 100 to 120KN, rate of penetration be every meter more than 40 minutes.When 1415m, adopt bottomhole assembly technology of the present invention.The off-axis of the eccentric shaft connection of this bottomhole assembly is apart from getting 28mm, and the distance between the lower limit tip to face distance drill bit upper limit end face of eccentric shaft connection is 8.7m, and rotary speed is 60rpm.At first adopt 180KN the pressure of the drill to creep into.At this moment, rate of penetration is every meter about 20 minutes, and when being drilled into 147.6m, hole angle is controlled within 2 °.Subsequently, the pressure of the drill is increased to 200KN, and rate of penetration is every meter about 18 minutes.When creeping into the most serious artesian well stratum of hole deviation, this technology has been controlled increasing sharply of hole deviation effectively, simultaneously also with high rate of penetration by the artesian well interval.When being drilled into 1639m, it is 9 ° at the permission hole angle of this well depth that hole angle only increases to 4.2 ° of engineering designs.Reduce to again about 2 ° by hole angle behind the artesian well layer position.Example 3 is in the application of Jiangsu well (81/2 " well)
This area's drilling straight-hole easily produces hole deviation, for guaranteeing wellbore quality, through power drilling tool well straightening commonly used.This well locates to be lowered to bottomhole assembly of the present invention at 56.2m (this moment, hole angle was 0 °).The off-axis of the eccentric shaft connection of this bottomhole assembly is apart from getting 18mm, and the distance between the lower limit tip to face distance drill bit upper limit end face of eccentric shaft connection is 8.5m, and rotary speed is 60rpm, and the pressure of the drill is 140KN.With the intact full well section of this well of this combination drill, anti-oblique well straightening effect is obvious, and rate of penetration is significantly increased.Real drilling well section surpasses 1600m, and hole angle is controlled in 2.75 °, and average rate of penetration improves 2.05～3.60 meters/hour.
The bottomhole assembly of the present invention that experiment showed, of this well prevents that oblique well straightening effect is obvious, can improve the drilling well timeliness significantly, sees Table 1.Table 1: test well compares with the hole deviation of contrast well
Test well contrast well
1# 2# well depth hole deviation well depth hole deviation well depth hole deviation (m) (°) (m) (°) (m) (°) 275.80 0.30 403.20 0.45 576.34 2.00493.39,1.45 583.37 1.00 641.70 2.10608.10,2.00 783.50 1.00769.68,2.45 730.49 1.15 896.29 2.20921.55,2.30 913.76 2.00 1021.34 2.451100.0 1.45 1155.42 3.30
1205.70?3.45
1267.10?4.301287.0 2.15 1305.08?4.00
1397.0 6.45 1366.49?3.451400.0 0.30 1637.2 3.00 1430.00?6.00
1505.00?6.00
Claims (3)
1, a kind of bottomhole assembly, comprise some drill collars, main part is eccentric shaft connection and drill bit that slurry channel is arranged in cylindrical, the top that it is characterized in that described eccentric shaft connection is provided with the inside tapered thread that is connected with the drill collar that is positioned at its upper end, the bottom is provided with the outer cone thread that is connected with the drill collar that is positioned at its lower end, be parallel to each other with the axis of the coaxial slurry channel of inside tapered thread with the axis of the axis of the coaxial slurry channel of outer cone thread and main part and lay respectively at its both sides, and the axis of the slurry channel that inside tapered thread is coaxial and and the axis of the coaxial slurry channel of outer cone thread between distance be 5～38 millimeters, the distance between the lower limit end face of described eccentric shaft connection main part and the described drill bit upper limit end face is 6～12 meters.
2,, it is characterized in that in the described eccentric shaft connection and the axis coaxial slurry channel of inside tapered thread and equate with the axis of the coaxial slurry channel of outer cone thread distance apart from the axis of described main part according to the described bottomhole assembly of claim 1.
3, a kind of boring method that uses the bottomhole assembly of claim 1 or 2 comprises the following steps:
1) according to formation characteristics, casing programme is selected the drill bit of different model;
2) select the lower end drill collar according to bite type and existing drill collar model;
3) the listed parameters relationship of according to the form below, according to selected bit size, drill collar external diameter, the pressure of the drill, rotary speed are determined the off-axis distance of eccentric shaft connection and the distance of eccentric shaft connection lower limit tip to face distance drill bit upper limit end face:
The eccentric shaft connection lower limit
Position tip to face distance bit drills area of bed off-axis is apart from drill collar external diameter the pressure of the drill rotary speed of upper limit end face
Distance (mm) is (m) (mm) (KN) (rpm) 165.1 88.9 to 152 80 to 200 (61/2 '), 444.5 216 to 254 140 to 250 (171/2 ') 311.2 216 to 228 120 to 240 (122/8 ') 50 to 150215.9 5 to 38 6 to 12 127 to 203 100 to 220 (81/2 ') (mm)
4) determine the upper end drill collar according to selected bite type, eccentric shaft connection and lower end drill collar size;
5) select high rotary speed drilling well for use by existing drilling technology process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121899A CN1064106C (en) | 1997-12-12 | 1997-12-12 | Lower drilling rig combination and its drilling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121899A CN1064106C (en) | 1997-12-12 | 1997-12-12 | Lower drilling rig combination and its drilling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1219638A true CN1219638A (en) | 1999-06-16 |
| CN1064106C CN1064106C (en) | 2001-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97121899A Expired - Fee Related CN1064106C (en) | 1997-12-12 | 1997-12-12 | Lower drilling rig combination and its drilling method |
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| CN (1) | CN1064106C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642333A (en) * | 2017-10-09 | 2018-01-30 | 中国石油天然气集团公司 | Slanting-proof quick-drilling utensil |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2092596U (en) * | 1990-02-15 | 1992-01-08 | 任俊 | Multi-purposed bit joints for underpit use |
| CN2114025U (en) * | 1991-04-16 | 1992-08-26 | 新疆石油局钻井工艺研究所 | Eccentric short piece for drilling |
| CN2282057Y (en) * | 1996-12-17 | 1998-05-20 | 大庆石油管理局钻井二公司 | Eccentric anti-inclining drill combination |
-
1997
- 1997-12-12 CN CN97121899A patent/CN1064106C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642333A (en) * | 2017-10-09 | 2018-01-30 | 中国石油天然气集团公司 | Slanting-proof quick-drilling utensil |
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| CN1064106C (en) | 2001-04-04 |
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