CN203097716U - Combined drill column device for drilling of directional well - Google Patents

Abstract

The utility model relates to a combined drill string device used in the industry of petroleum and geological and mineral exploration directional well drilling. The combined drill string device for directional well drilling is characterized in that it consists of a roller cone bit, a screw drilling tool, a float valve, a centralizer, a non-magnetic drill collar, an inclinometer, a non-magnetic drill collar, a jar and a drill pipe from Direct connections from bottom to top in turn. The screw drilling tool has a 1.5° camber, which is mainly used for deflection in directional wells; the floating valve is mainly used to prevent blowout accidents during drilling; the outer wall of the non-magnetic drill collar is welded with small steel bars to prevent Drill string twist during directional drilling. It is proved by theoretical analysis that the device with the non-magnetic drill collar welded with small steel strips on the outer wall is not easy to twist no matter how much axial pressure fluctuation it bears during directional drilling, and this feature is realized structurally in the utility model , so that directional drilling can be carried out safely and quickly, greatly reducing the drilling cycle and saving drilling costs, it is a brand new directional drilling downhole drill string device.

Description

A combined drill string device for directional well drilling

technical field

The utility model belongs to the field of oil and gas well engineering, in particular to a combined drill string device for directional well drilling.

Background technique

Due to the structural characteristics of directional wells, the key technical difficulties in trajectory control are high friction and torque, difficult control of screw drilling device angle, and slow drilling speed. At present, in order to speed up the angle control speed of the screw drilling tool device and reduce the drilling cycle in directional well drilling in my country, the following processing methods are mainly adopted:

1. Adding treatment drilling fluid

By adding lubricant to the drilling fluid during the drilling process, the frictional resistance and torque between the drill string and the well wall can be reduced, and the angle control speed of the screw drilling device can be accelerated. However, due to the excessive friction resistance and torque between the drilling string and the well wall, if too little lubricant is added, the effect is not ideal; if too much lubricant is added, the operating cost will increase. Especially in evaluation wells, if there is crude oil or diesel oil in the added lubricant, it will directly lead to inaccurate oil and gas display in mud logging, and it is difficult to judge the horizon, which makes this technology even more limited.

Second, the use of rotary steering

At present, a large part of directional well construction will be completed by rotary drilling after directional drilling reaches a certain depth. But in the operation of the directional section, because the "push-and-pull" rotary steering is highly dependent on the formation, the "pointing" rotary steering is not suitable for some formations. Moreover, the rotary steerable is still in the monopoly period, and the operation cost is high during use, and the cost is too high.

3. Drilling and reaming adjustment

Due to the buckling of the downhole drilling tool, there will be countless contact points between the bottom hole assembly, the drill string and the well wall, and most of the added torque will be unloaded by these contact points, resulting in the torque added to the screw drilling tool. The torque is very small. If the torque is forced to be increased at this time, the contact point will break through the constraint of the well wall, and the torque on the screw drilling tool will suddenly increase a lot, which will cause great damage to the screw drilling tool. Therefore, under normal circumstances, a small section of the well that has been drilled should be remarked in time to repair the smoothness of the wellbore. But it has the following two defectives: 1. Digging frequently in a short period of time increases the risk of drilling tool "self-locking" sticking. 2 Although friction and torque can be reduced to a certain extent, it takes a long time to re-control the angle of the screw drilling device when the drill bit reaches the bottom of the well after each reaming, and the drilling cycle will increase a lot.

Contents of the invention

The purpose of this utility model is to provide a simple structure, easy to use, safe and reliable combined drill string device for directional well drilling in order to solve the above problems. During the directional drilling process, when the combined drill string device is lowered into the well, the non-magnetic drill collar with small steel strips welded on the outer wall is not easy to twist at will no matter how much axial pressure fluctuation it bears. In this way, the purposes of greatly shortening the angle control time of the screw drilling tool device, improving the efficiency of directional drilling and reducing the cost of directional drilling are achieved.

In order to achieve the above object, the technical scheme adopted in the utility model is:

The combined drill string device for directional well drilling of the utility model consists of a roller cone bit 1, a screw drilling tool 2, a float valve 3, a centralizer 4, a non-magnetic drill collar 5, an inclinometer 6, a non-magnetic drill collar 7, and a jar 8 and drill rod 9 are directly connected successively from bottom to top to form. The roller cone bit 1 is an API standard drill bit with an outer diameter of 311.2 mm; the screw drilling tool 2 is an API standard screw drill with a 1.5° camber and an outer diameter of 244.47 mm, which is mainly used for directional well deflection ; The float valve 3 uses an arrow-shaped float valve, and the outer diameter is an API standard float valve of 203.2 millimeters, which mainly prevents blowout accidents when drilling; The standard non-magnetic drill collar has small steel bars welded on its outer wall. The length of the small steel bars is 20 cm. The outer wall of the drill collar is divided into three equal parts. Each row of small steel bars is separated by half a meter to prevent the drill string from twisting during directional drilling; The outer diameter of the centralizer 4 is 292.1 mm, which is used to stabilize the entire drill string; the outer diameter of the inclinometer 6 is 203.2 mm, which is used to monitor the entire borehole trajectory in real time; the jar 8 is a mechanical Type, the outer diameter is 196.85 mm, used to release the stuck drill during drilling; the drill pipe described is a 127 mm API standard drill pipe. It is proved by theoretical analysis that the non-magnetic drill collars 6 and 7 with small steel strips welded on the outer wall are not easy to twist no matter how much axial pressure fluctuations they bear, and this feature is realized structurally in the utility model.

The design principle of the utility model:

In the process of directional drilling operation, the combined drill string device is first lowered into the downhole, and the combined drill string device is composed of a roller cone bit 1, a screw drilling tool 2, a float valve 3, a centralizer 4, a non-magnetic drill collar 5, an inclinometer Instrument 6, non-magnetic drill collar 7, jar 8 and drill pipe 9 are directly connected sequentially from bottom to top. The screw drilling tool 2 has a camber of 1.5°, which is mainly used for deflection in directional wells; the float valve 3 uses an arrow-shaped float valve, mainly to prevent blowout accidents during drilling; the non-magnetic drill collar 6, 7 The outer wall is welded with small steel bars, the length of which is 20 centimeters, and the outer wall of the drill collar is divided into three equal parts to prevent the twisting of the drill string during directional drilling; the centralizer 4 is used to stabilize the entire drill string; The above-mentioned inclinometer 6 is used for real-time monitoring of the entire wellbore trajectory; the above-mentioned jar 8 is mechanical, and is used for releasing the stuck pipe when it is stuck in the drilling process. For boreholes of different sizes, the size of a single combined drill string device cannot meet the construction requirements of directional drilling, so different sizes of combined drill string devices and small steel bars welded on the outer wall of the non-magnetic drill collar are set until the drilling requirements are fully met. In this way, the purpose of greatly shortening the angle control time of the drill string device is achieved, thereby reducing the drilling cycle and cost of the directional well.

The setting of the small steel bar welded on the outer wall of the non-magnetic drill collar, on the one hand, needs to set the diameter of the small steel bar slightly larger in consideration of the wear and tear of long-term use; on the other hand, if the diameter of the small steel bar is set too If the diameter is too large, the torque of the entire drill string will be too large during rotary drilling. The diameter of the small steel rod should be set according to different hole sizes.

The combined drill string device for directional well drilling is realized through the following technical solutions in the drilling process: (1) firstly adjust the size of each part of the whole combined drill string device according to the own conditions of different well sections; (2) The outer wall of the non-magnetic drill collar in the combined drill string device is welded with 20 cm long small steel bars. The small steel bars divide the outer wall into three equal parts, and the distance between each row of small steel bars is half a meter, which greatly shortens the drill string device. Angle control time, thereby reducing the drilling cycle and cost of directional wells.

The beneficial effects of the utility model:

It can be seen from the above structural design that the combined drill string device for directional well drilling of the present invention adopts the non-magnetic drill collar with small steel strips welded on the outer wall, so it is not easy to twist no matter how much axial pressure fluctuation it bears. The device angle control time of the combined drill string is greatly shortened. The combined drill string device for directional well drilling has been proved by indoor research and field use, and has the characteristics of convenient use, long service life, safety and reliability, can reduce directional drilling time, and significantly reduce directional drilling costs. The device avoids the risk that the combined drill string device used for directional well drilling cannot be released after the drill is stuck downhole.

Description of drawings

Fig. 1 is a schematic diagram of the main structure of a combined drill string device for directional well drilling according to Embodiment 1 of the present utility model. Fig. 2 is a top view of a non-magnetic drill collar with small steel bars welded on its outer wall. In the figure: 1 roller cone bit, 2 screw drilling tool, 3 float valve, 4 centralizer, 5 non-magnetic drill collar, 6 inclinometer, 7 non-magnetic drill collar, 8 jar, 9 drill pipe.

Detailed ways

Example 1

A combined drill string device for directional well drilling, characterized in that it consists of a roller cone bit 1, a screw drilling tool 2, a float valve 3, a centralizer 4, a non-magnetic drill collar 5, an inclinometer 6, a non-magnetic drill collar 7, a vibration The striker 8 and the drill pipe 9, all parts are selected API standard parts, which are directly connected sequentially from bottom to top in actual use. The roller cone bit 1 is an API standard drill bit with an outer diameter of 311.2 mm; the screw drilling tool 2 is an API standard screw drill with a 1.5° camber and an outer diameter of 244.47 mm, which is mainly used for directional well deflection ; The float valve 3 uses an arrow-shaped float valve, and the outer diameter is an API standard float valve of 203.2 millimeters, which mainly prevents blowout accidents when drilling; the non-magnetic drill collars 6 and 7 are 203.2 millimeters in outer diameter API standard non-magnetic drill collar, its outer wall is welded with small steel bars, the length of the small steel bars is 20 cm, the outer wall of the drill collar is divided into three equal parts, and each row of small steel bars is separated by half a meter, which is used to prevent the drill string from twisting during directional drilling ; The outer diameter of the centralizer 4 is 292.1 millimeters, used to stabilize the entire drill string; the outer diameter of the inclinometer 6 is 203.2 millimeters, used for real-time monitoring of the entire borehole trajectory; the jar 8 is Mechanical, with an outer diameter of 196.85 mm, used to release the stuck drill during drilling; the drill pipe described is a 127 mm API standard drill pipe. It is proved by theoretical analysis that the non-magnetic drill collars 6 and 7 with small steel bars welded on the outer wall are not easy to twist no matter how much axial pressure fluctuations they bear, and this feature is realized structurally in the utility model.

The combination drill string device for directional well drilling has been proved by indoor research and field use. It has the characteristics of convenient use, long service life, safety and reliability, can quickly control the installation angle of the screw drilling tool, and obviously reduces the cost of directional drilling. It has a wide range of applications. Promote application value.

The unexplained parts involved in the utility model are the same as the prior art or implemented by adopting the prior art.

Claims (5)

1. the utility model relates to a kind of directional well drilling combination drill column device, it is characterized in that: it is directly connected to form from top to bottom successively by rock bit (1), helicoid hydraulic motor (2), float valve (3), centralizer (4), non-magnetic drill collar (5), inclinometer (6), non-magnetic drill collar (7), bumper jar (8) and drilling rod (9).

2. directional well drilling combination drill column device according to claim 1 is characterized in that: it is API master screw drilling tools of 244.47 millimeters that described helicoid hydraulic motor (2) has 1.5 ° of cambers, external diameters, is mainly used in the directional well deflecting.

3. directional well drilling combination drill column device according to claim 1 is characterized in that: described float valve (3) uses arrow-like floating valve, and its external diameter is 203.2 millimeters an API standard float valve, mainly prevents gas blowout accident when drilling well.

4. directional well drilling combination drill column device according to claim 1, it is characterized in that: described non-magnetic drill collar (6,7) is the non-magnetic drill collar of API standard of 203.2 millimeters of external diameters, its outer wall is welded with little steel bar, 20 centimetres of little steel bar length, with drill collar outer wall circumference trisection, half meter far away at interval of the little steel bar of every row, drill string reverses when being used for preventing directed drilling.

5. directional well drilling combination drill column device according to claim 1 is characterized in that: described bumper jar (8) is mechanical, and external diameter is 196.85 millimeters, is used in unfreezing when in the drilling process bit freezing taking place.

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