阅读说明：本技术 充填钻孔单孔深井的钻探方法 (Drilling method for filling drilled single-hole deep well ) 是由 董凯飞 姜作生 陈岳 张新生 李涛 刘志远 史晓东 赵志凌 陈晓华 张杰丰 于 2021-09-07 设计创作，主要内容包括：本发明涉及充填钻孔深井钻探的技术领域,尤其涉及充填钻孔单孔深井的钻探方法；本发明选用了钻孔钻具组合用φ311.1mm钻头直接从海拔+187米到-960米处,同时满足了充填钻孔精准入巷,偏斜率不超过2.5‰的技术要求,因此达到了单孔深度为1147米的大跨度深度精准钻孔,解决了因地质情况复杂且跨度较大的充填钻孔单孔深井的钻探及保证精准度的技术难题。(The invention relates to the technical field of deep well drilling of a filling borehole, in particular to a drilling method of a single-hole deep well of a filling borehole; the drill bit with the diameter of 311.1mm for the drilling tool combination is selected to directly reach the position from the altitude of +187m to-960 m, and simultaneously the technical requirements that the filling and drilling are accurate to enter the roadway and the deflection rate does not exceed 2.5 thousandth are met, so that the large-span deep accurate drilling with the single-hole depth of 1147 m is achieved, and the technical problems of drilling and accuracy guarantee of the filling and drilling single-hole deep well with complicated geological conditions and large span are solved.)

1. A drilling method for filling a drilled single-hole deep well is characterized in that:

s1, drilling: forming a drill hole with the depth of 1147 meters by using a drilling tool assembly to enable a phi 311.1mm drill bit to be drilled from the elevation of +187m to-960 m, wherein the drilling pressure of the phi 311.1mm drill bit is 60-100 KN, the rotating speed is 55rpm, the pump capacity is 30-40L/s, and the pump pressure is 6-8 MPa;

s2, monitoring: when the drilling tool assembly is used for drilling, HLMWD wireless while-drilling equipment is used for monitoring the verticality of the drilled hole, and the deviation rate of the drilled hole is guaranteed to be less than or equal to 2.5 per mill; simultaneously, a screw rod and the HLMWD wireless inclinometer are put in to control the well track, the proportion of sliding and composite drilling is adjusted in the drilling process, so that the well track is relatively smooth, the pressure sensor in the HLMWD wireless inclinometer is used for sensing the pressure change of the slurry, and the pressure signal of the slurry is converted into an electric signal in a pulse signal mode in a wireless transmission mode, so that the positioning is more accurate;

s3, checking: determining to align a direction on the ground by using a gyro inclinometer, then starting the gyro inclinometer to descend into a well, measuring and recording the rotated angle of the instrument relative to the actual direction, and verifying data acquired by the HLMWD wireless inclinometer while drilling to ensure that the drilling deviation rate is less than or equal to 2.5 per thousand;

s4, drifting: after drilling, drifting is carried out by adopting a drifting drilling tool combination, the drifting can be carried out in a large-displacement circulation mode for 2 weeks after the drifting is not obstructed, and the open hole section is sealed by adopting a sealing drilling fluid before the drifting is carried out;

s5, lower tube: after drilling and drifting are finished, selecting an alloy composite wear-resistant pipe with the outer diameter phi 219mm (the thickness of a wall thickness delta 12+14 wear-resistant layer is mm) as a filling pipe, aligning the filling pipe section by section and carrying out threaded connection, coating thread oil on a connecting thread of the filling pipe, arranging a floating hoop and a floating shoe at the bottom end of a casing string of each stage to meet the safety requirements of pipe lowering and well cementation, and then putting the casing string into a drill hole, wherein the pressure bearing of the pipe body is more than 12MPa, the weight of a single filling pipe is 1.06 ton, the number of the filling pipe is 128, and the total mass is 135 tons;

s6, cementing: the cement sealing of the whole well section adopts a cement slurry formula: grade p.o42.5 canned cement, cement paste density: carrying out heavy planting (+ -0.03) at 1.75g/cm to ensure the stabilizing effect of full-section well cementation;

s7, identification: and additionally arranging a wellhead protection device at the upper end of the filling pipe, and welding an obvious well number mark on a coupling of the filling pipe, wherein the wellhead protection device is a wellhead cap or a blind plate.

2. The method of drilling a packed borehole single bore according to claim 1, wherein: the drilling tool assembly is as follows: phi 311.1mm drill bit + phi 203mm screw (1 deg.) + HLMWD directional pup joint + phi 203mm non-magnetic drill collar 1 root + phi 203mm drill collar 2 root + phi 178mm drill collar 9 root + phi 127mm drill rod.

3. The method of drilling a packed borehole single bore according to claim 1, wherein:

s1, filling the drilled hole: using a drilling tool assembly to expand a roller bit with phi 215.9mm from the altitude of +187m to-960 m to the bottom of the well from the altitude of +187m to-960 m by using a combined bit with phi 311.1mm to form a borehole with phi 311mm and the depth of 1147 m;

s2, monitoring: when the drilling tool assembly is used for drilling, HLMWD wireless while-drilling equipment is used for monitoring the verticality of the drilled hole, and the deviation rate of the drilled hole is guaranteed to be less than or equal to 2.5 per mill; simultaneously, a screw rod and the HLMWD wireless inclinometer are put in to control the well track, the proportion of sliding and composite drilling is adjusted in the drilling process, so that the well track is relatively smooth, the pressure sensor in the HLMWD wireless inclinometer is used for sensing the pressure change of the slurry, and the pressure signal of the slurry is converted into an electric signal in a pulse signal mode in a wireless transmission mode, so that the positioning is more accurate;

s3, checking: determining to align a direction on the ground by using a gyro inclinometer, then starting the gyro inclinometer to descend into a well, measuring and recording the rotated angle of the instrument relative to the actual direction, and verifying data acquired by the HLMWD wireless inclinometer while drilling to ensure that the drilling deviation rate is less than or equal to 2.5 per thousand;

s4, drifting: after drilling, drifting is carried out by adopting a drifting drilling tool combination, the drifting can be carried out in a large-displacement circulation mode for 2 weeks after the drifting is not obstructed, and the open hole section is sealed by adopting a sealing drilling fluid before the drifting is carried out;

s5, lower tube: after drilling and drifting are finished, selecting an alloy composite wear-resistant pipe with the outer diameter phi 219mm (the thickness of a wall thickness delta 12+14 wear-resistant layer is mm) as a filling pipe, aligning the filling pipe section by section and carrying out threaded connection, coating thread oil on a connecting thread of the filling pipe, arranging a floating hoop and a floating shoe at the bottom end of a casing string of each stage to meet the safety requirements of pipe lowering and well cementation, and then putting the casing string into a drill hole, wherein the pressure bearing of the pipe body is more than 12MPa, the weight of a single filling pipe is 1.06 ton, the number of the filling pipe is 128, and the total mass is 135 tons;

s6, cementing: the cement sealing of the whole well section adopts a cement slurry formula: grade p.o42.5 canned cement, cement paste density: carrying out heavy planting (+ -0.03) at 1.75g/cm to ensure the stabilizing effect of full-section well cementation;

s7, identification: and additionally arranging a wellhead protection device at the upper end of the filling pipe, and welding an obvious well number mark on a coupling of the filling pipe, wherein the wellhead protection device is a wellhead cap or a blind plate.

4. The method of drilling a packed borehole single bore according to claim 3, wherein: the drill bit with the diameter of 215.9mm has the bit pressure of 60-120 KN, the rotating speed of 40-60 rpm, the pump capacity of 30-40L/s and the pump pressure of 6-8 MPa.

5. The method of drilling a packed borehole single bore according to claim 3, wherein: the drilling pressure of the phi 311.1mm combined drill bit is 60-100 KN, the rotating speed is 15-30 rpm, the pump capacity is 20-30L/s, and the pump pressure is 6-8 MPa.

6. The method of drilling a packed borehole single bore according to claim 3, wherein: the drilling tool assembly is as follows: phi 215.9mm roller bit + phi 172mm screw (1 deg.) + HLMWD directional pup joint + phi 178mm nonmagnetic drill collar 1 root + phi 178mm drill collar 2 root + phi 165mm drill collar 9 root + phi 127mm drill rod.

7. The method of drilling a packed borehole single bore according to claim 3, wherein: the reaming drill assembly comprises the following steps: combined drill bit with phi 311.1mm, drill collar 2 with phi 203mm, drill collar 10 with phi 178mm and drill rod 127 mm.

Technical Field

The invention relates to the technical field of deep well drilling, in particular to a drilling method for filling a drilled single-hole deep well.

Background

The filling and drilling project is located in the mountain area of south Finland of Benxi, Liaoning province, the mountain area of countryside, belongs to a new mineral industry bidding project, is the largest single iron ore which is found and registered in China, and the maximum vertical depth reaches 1500 meters. The filling drill hole constructed in the construction process belongs to the deepest filling drill hole in China at present, the depth of the filling drill hole is 1147 meters, the elevation is between +187m and-960 m, the stratum of a region is old, the lithology is variable, the rock abrasiveness is strong, the drillability is poor, and the construction difficulty is large. Meanwhile, the requirement of filling a drilling precise entry lane is met, the deflection rate does not exceed 2.5 per mill, and the requirement on precision is high.

Disclosure of Invention

The invention aims to solve the problem of how to realize accurate entry of single-hole drilling with the depth of 1147 m and the accuracy of 2.5 per mill under the conditions of complex stratum structure and large span.

In order to solve the technical problems, the invention provides a technical scheme for solving the technical problems, which is as follows: the method comprises the following steps:

s1, drilling: forming a drill hole with the depth of 1147 meters by using a drilling tool assembly to enable a phi 311.1mm drill bit to be drilled from the elevation of +187m to-960 m, wherein the drilling pressure of the phi 311.1mm drill bit is 60-100 KN, the rotating speed is 55rpm, the pump capacity is 30-40L/s, and the pump pressure is 6-8 MPa;

s2, monitoring: when the drilling tool assembly is used for drilling, HLMWD wireless while-drilling equipment is used for monitoring the verticality of the drilled hole, and the deviation rate of the drilled hole is guaranteed to be less than or equal to 2.5 per mill; simultaneously, a screw rod and the HLMWD wireless inclinometer are put in to control the well track, the proportion of sliding and composite drilling is adjusted in the drilling process, so that the well track is relatively smooth, the pressure sensor in the HLMWD wireless inclinometer is used for sensing the pressure change of the slurry, and the pressure signal of the slurry is converted into an electric signal in a pulse signal mode in a wireless transmission mode, so that the positioning is more accurate;

s3, checking: determining to align a direction on the ground by using a gyro inclinometer, then starting the gyro inclinometer to descend into a well, measuring and recording the rotated angle of the instrument relative to the actual direction, and verifying data acquired by the HLMWD wireless inclinometer while drilling to ensure that the drilling deviation rate is less than or equal to 2.5 per thousand;

s4, drifting: after drilling, drifting is carried out by adopting a drifting drilling tool combination, the drifting can be carried out in a large-displacement circulation mode for 2 weeks after the drifting is not obstructed, and the open hole section is sealed by adopting a sealing drilling fluid before the drifting is carried out;

s5, lower tube: after drilling and drifting are finished, selecting an alloy composite wear-resistant pipe with the outer diameter phi 219mm (the thickness of a wall thickness delta 12+14 wear-resistant layer is mm) as a filling pipe, aligning the filling pipe section by section and carrying out threaded connection, coating thread oil on a connecting thread of the filling pipe, arranging a floating hoop and a floating shoe at the bottom end of a casing string of each stage to meet the safety requirements of pipe lowering and well cementation, and then putting the casing string into a drill hole, wherein the pressure bearing of the pipe body is more than 12MPa, the weight of a single filling pipe is 1.06 ton, the number of the filling pipe is 128, and the total mass is 135 tons;

s6, cementing: the cement sealing of the whole well section adopts a cement slurry formula: grade p.o42.5 canned cement, cement paste density: carrying out heavy planting (+ -0.03) at 1.75g/cm to ensure the stabilizing effect of full-section well cementation;

s7, identification: and additionally arranging a wellhead protection device at the upper end of the filling pipe, and welding an obvious well number mark on a coupling of the filling pipe, wherein the wellhead protection device is a wellhead cap or a blind plate.

As the drill bit with the diameter of 311.1mm is directly drilled from the elevation of +187m to-960 m by the drilling tool combination, the invention achieves the large-span high-precision accurate drilling with the single-hole depth of 1147 m and solves the problem of higher difficulty of the single-hole depth and precision under the conditions of complicated geology and large span.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Item address: sishan mountain county in south Feng district of Benxi province of Liaoning province

Item conditions: the depth of the single hole is 1147 m, specifically the altitude is from +187m to-960 m

Geological conditions: the formation in the mine area is divided into a crystalline substrate and a deposited cover layer. Wherein, the crystal substrate is not exposed on the ground surface and only appears in the drill hole, and consists of a Pacific mountain group, namely the Tsingtakuh group in Taigu kingdom and a Liaohe group, namely the Langzi mountain group in the next Yuangu kingdom, the stratum undergoes deep metamorphism and hydrothermal metamorphism, the mixed lithology effect is strong, the rock hardness is high, and the drillability is poor; the deposition cover layer is composed of upper ancient Qingbaikou system, jordan system, lower ancient Hanwu system and fourth new-born system.

Drilling the stratum:

1. fourth series (Q): the depth is 0-10 m;

2. langzishan group of the Liaohe swarm (Pt 1 l): the depth is 10-780 m;

firstly, green schist;

(ii) dolomite marbles;

③ phyllite;

quartzite.

3. Saracan zethatch (Arcg): the depth is 780-1147 m.

Carbonate red iron quartzite (upper iron-containing rock stratum) with the thickness of 1.73-212.90 m;

② striped hematite (No. I ore body) with the thickness of 20.21-216.01 m;

③ the thickness of the strip-shaped hematite quartzite (or the low-grade hematite ore) is 24.60 to 118.60 m;

fourthly, striped and strip hematite (II ore body) with the thickness of 2.18 to 416.46 m;

strip-shaped magnetite ore (III ore body) with the thickness of 25.69-203.58 m;

sixthly, the thickness of the strip-shaped magnet quartzite (or the low-grade magnetite ore) is 12.70-110.50 m;

seventhly, the thickness of the striped magnetic iron ore (IV ore body) is 3.37-753.82 m;

eighthly, stripy and strip-shaped hematite ore (No. V ore body) with the thickness of 6.95-147.33 m;

ninthly, carbonatation magnetite quartzite (or IV ore body and interlayer) with the thickness of 1.40-341.01 m;

talc magnetite quartzite (or IV ore body and interlayer) in the red cavity, the thickness is 4.40-85.39 m;

⑪ Heiyun angle amphibole (interlayer or bottom rock stratum) with thickness of 1.70-198.40 m.

According to the factors of stratum lithology, technical requirements, equipment, construction conditions and the like, the drilling method and the selected drilling tool are determined, and two drilling methods are designed, as described in the following examples 1-2

Example 1

S1, drilling: forming a drill hole with the depth of 1147 meters by using a drilling tool assembly to enable a phi 311.1mm drill bit to be drilled from the elevation of +187m to-960 m, wherein the drilling pressure of the phi 311.1mm drill bit is 60-100 KN, the rotating speed is 55rpm, the pump capacity is 30-40L/s, and the pump pressure is 6-8 MPa;

s2, monitoring: when the drilling tool assembly is used for drilling, HLMWD wireless while-drilling equipment is used for monitoring the verticality of the drilled hole, and the deviation rate of the drilled hole is guaranteed to be less than or equal to 2.5 per mill; simultaneously, a screw rod and the HLMWD wireless inclinometer are put in to control the well track, the proportion of sliding and composite drilling is adjusted in the drilling process, so that the well track is relatively smooth, the pressure sensor in the HLMWD wireless inclinometer is used for sensing the pressure change of the slurry, and the pressure signal of the slurry is converted into an electric signal in a pulse signal mode in a wireless transmission mode, so that the positioning is more accurate;

s3, checking: determining to align a direction on the ground by using a gyro inclinometer, then starting the gyro inclinometer to descend into a well, measuring and recording the rotated angle of the instrument relative to the actual direction, and verifying data acquired by the HLMWD wireless inclinometer while drilling to ensure that the drilling deviation rate is less than or equal to 2.5 per thousand;

s4, drifting: after drilling, drifting is carried out by adopting a drifting drilling tool combination, the drifting can be carried out in a large-displacement circulation mode for 2 weeks after the drifting is not obstructed, and the open hole section is sealed by adopting a sealing drilling fluid before the drifting is carried out;

s5, lower tube: after drilling and drifting are finished, selecting an alloy composite wear-resistant pipe with the outer diameter phi 219mm (the thickness of a wall thickness delta 12+14 wear-resistant layer is mm) as a filling pipe, aligning the filling pipe section by section and carrying out threaded connection, coating thread oil on a connecting thread of the filling pipe, arranging a floating hoop and a floating shoe at the bottom end of a casing string of each stage to meet the safety requirements of pipe lowering and well cementation, and then putting the casing string into a drill hole, wherein the pressure bearing of the pipe body is more than 12MPa, the weight of a single filling pipe is 1.06 ton, the number of the filling pipe is 128, and the total mass is 135 tons;

s6, cementing: the cement sealing of the whole well section adopts a cement slurry formula: grade p.o42.5 canned cement, cement paste density: carrying out heavy planting (+ -0.03) at 1.75g/cm to ensure the stabilizing effect of full-section well cementation;

s7, identification: and additionally arranging a wellhead protection device at the upper end of the filling pipe, and welding an obvious well number mark on a coupling of the filling pipe, wherein the wellhead protection device is a wellhead cap or a blind plate.

The drilling tool assembly is as follows: phi 311.1mm drill bit + phi 203mm screw (1 deg.) + HLMWD directional pup joint + phi 203mm non-magnetic drill collar 1 root + phi 203mm drill collar 2 root + phi 178mm drill collar 9 root + phi 127mm drill rod.

Table 1 example 1 drill bit parameters

Example 2

S1, drilling: drilling a roller bit with the diameter of 215.9mm from the elevation of +187m to-960 m by using a drilling tool assembly, and then drilling a hole bottom with the diameter of 311.1mm from the elevation of +187m to-960 m by using a reaming tool assembly to form a drilled hole with the depth of 1147 meters;

the rest of the procedure was the same as in example 1.

The drilling tool assembly is as follows: phi 215.9mm roller bit + phi 172mm screw (1 deg.) + HLMWD directional pup joint + phi 178mm nonmagnetic drill collar 1 root + phi 178mm drill collar 2 root + phi 165mm drill collar 9 root + phi 127mm drill rod.

The reaming drill assembly comprises the following steps: combined drill bit with phi 311.1mm, drill collar 2 with phi 203mm, drill collar 10 with phi 165mm and drill rod 127 with phi.

Table 2 example 2 drilling bit, combination bit technical parameters

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.