The method of drilling wells

 

The invention relates to the construction of wells for liquid and gaseous minerals and can be used to control the drilling process. The invention consists in that the method of drilling wells includes the descent of the drill string, rotating the rock cutting tool, the creation of axial load on the rock-breaking tool and maintaining it constant at fixed from movement of the upper end of the drill string by filing through the flexible connection part of the BHA relative to the drill pipe string, with additional axial load is generated by an additional feeder movable in the axial direction above the movable connection of the parts of the BHA. The invention allows to automatically maintain optimum parameters of the drilling process and to increase the speed of drilling while reducing the accident rate. 1 Il.

The invention relates to the field of construction of wells for liquid and gaseous minerals and can be used to control the drilling process.

There is a method of drilling with automatic is Quain. M.: Nedra, 1969). Following drilling methods based on automation of the drilling process for registration of the change of weight of the drill string (BK - drillstring consists of BHA - BHA and the drill pipe string - CBT instructions on the calculation of the drill string for oil and gas wells. M., 1977) on the hook or by using a weight sensor on the bottom.

The above methods have laid truncation error arising from the influence of the friction forces acting on the supports and on the surface of the rollers of the weight sensor, the resistance forces Bq in the borehole, the inertia of the drawworks, the force of friction on the brake disc, etc., In connection with which the recorded parameters unreliable, especially axial load. All this leads to deterioration of the technological parameters of drilling.

The closest technical solution is (and.with. The USSR 644936, CL E 21 In 17/00, publ. 30.01.79. ABOUT 4, 1979) device for generating load on the bit, allowing the drilling of wells, according to which the lower drill string, rotating the rock-breaking tool, create an axial load on the rock-breaking tool and maintain it constant at fixed from movement of main columns relative to the drill pipe string.

The lack of technical solutions is the inability to automatically maintain a constant axial load in the drilling process. Stabilization of selected design load is carried out only under a load of a certain weight of BHA below the stem. A significant influence on the axial load has the pressure of the flushing fluid in circulation. The presence of the channel, indicating the internal cavity of the device with the annular space, does not compensate for the hydraulic pressure fluctuations during the passage of the solution through the device in the presence of current movements number of local resistance (radial and axial channels), where the pressure will constantly change depending on the rheological properties of the solution. To ensure stabilization even at one given load is impossible. The change in load on the face due to the pulley system leads to the normal drilling mode, when served the upper end of the drill string results in distortion of the recorded drilling parameters given in the similar.

Therefore, partial stabilization of the estimated load is only possible when one weight BHA.

The present invention is the task: automaticamente accidents.

To achieve a technical result in the drilling of wells, according to which the lower drill string, rotating the rock-breaking tool, create an axial load on the rock-breaking tool and maintain it constant at fixed from movement of the upper end of the drill string by filing through the flexible connection part of the BHA relative to the drill pipe string, wherein the additional axial load is generated by an additional feeder movable in the axial direction above the movable connection of the parts of the BHA.

We have not identified the sources of patent documents and scientific literature describing the claimed method of drilling where additional thrust is generated by additional feeder movable in the axial direction above the movable connection of the parts of the BHA.

The invention is not obvious from the prior art, that is, meets the condition of inventive step. Thus, the technical result achieved due to unknown transactions vain carry out the creation of axial loads through additional feeder movable in the axial direction, located above the movable connection of the parts of the BHA.

The lower part of the BHA while drilling a constant, it is basically a heavy-weight drill pipe - UBT (of a certain length and weight), which is defined in advance, based on geological and technical conditions. Through the lower part of the BHA create axial load on portarray tool, and because it is constant in weight and moves freely in the axial direction (up-down), then the load of the lower part of the BHA, standing in the drilling process, while CBT and the upper part of the BHA fixed in the axial direction. In addition, due to the possibility of axial movement of the lower part of the bottom hole Assembly relative to the drill pipe string is the damping of the oscillations generated rock cutting tool. Oscillations are damped inertial mass BHA freely in the axial direction relative to CBT. And solved the problem of vibration of the drill string, which significantly affects the axial load. The variation of the axial load on the rock cutting tool vibration reaches 25-50% of the average measured. Consequently facilitates the work of the drill string, it is easier to regulate the axial nagruzke in the axial direction relative to CBT. I.e., if the axial load is not enough, it also forms part of the BHA above the lower movable connection.

The implementation of the method is illustrated in the drawing.

For implementing the method of drilling with maintaining a constant load on the bit of the drill column contains a string of drill pipe 1, the layout of the bottom of the drill string, including heavy-weight drill pipe (UBT) - 2, mobile connection - 3, heavy-weight drill pipe (UBT) - 4, mobile connection - 5, heavy-weight drill pipe (UBT) - 6, the turbo-drill - 7 and bit - 8.

Breaking incision on top of drillability where the parameters are set drilling, axial load, the speed of rotation of the bit under specified conditions wash, easy to use this method to automatically maintain the drilling process in a given technological indicators that are excluded in the known drilling methods.

The method is as follows.

According to geological and technical outfit drilling parameters for the conditions of turbine following way: bit speed 300 rpm, the axial load capacity of 8 tons, the flow of washing fluid 56 l/s, the bit THO, heavy-weight drill pipe 146 mm, drill pipe 127 mm, the turbodrill STSS.

For the decisive tool 8 (a bit SGNU mm), sub, turbodrill STSS - 7, the lower part UTL - 6 with a diameter of 146 mm, length 82 m mobile connection 5 connecting UTL - 6 with the upper part of the HDP - 4, through the flexible connection - 5, another flexible connection - 3, UBT - 2 and KB - 1. The assembled arrangement of the drill string lowered into the well and canopy prerabotuva rock cutting tool 8. After running CBT - 1 and BHA serves down to move the lower movable connection - 5. In this part of the drill string above a movable connection - 5, is in the stretched state, and the axial load of 8 tons of create the bottom part of the BHA UTL - 6 length 82 m, located between the turbo-drill - 7 and a movable connection 5, which is automatically maintained during the entire interval of drilling. When the winch drum braked and therefore part of the drill string above the upper movable connection - 5 is not moved.

Probureu interval of the cut is equal move the upper movable connection - 5, which will be seen to increase the weight on the hook, again served with a drill string down the length of stroke of the movable joint - 5 and the drum of the winch again to slow down the drilling of the next interval. Thus, carry the storm is then additionally served Bq down and unload the part of the BHA, consisting of HDP - 4 in the movable connection - 3. Such parts of the BHA may be several.

The reduction of the axial load on the rock cutting tool 8 is carried out by tension Bq located on a movable connection - 5.

In the case of drilling with coring in the layout of the drill string must be included with coring the projectile. This drilling method is not changed, but are subject to change technical parameters of the drilling, axial load, the speed of rotation of the coring bit, the flush fluid flow that is set in advance geological-technical outfit on drilling wells.

When the rotary drilling method of the layout eliminates the turbodrill - 7.

In the proposed method of drilling an axial load is maintained automatically and simultaneously suppress mechanical vibrations of the drill string. The proposed drilling method is simple, reliable, cheap and effective compared to existing based on a complex system of management of the drilling process. The proposed solution will improve the speed of drilling, to reduce accidents.

Claims

The method of drilling wells, according to which drill down number is ribaut her constant at fixed from movement of the upper end of the drill string by filing through the flexible connection part of the BHA relative to the drill pipe string, characterized in that the additional axial load is generated by an additional feeder movable in the axial direction above the movable connection of the parts of the BHA.

 

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FIELD: mining industry.

SUBSTANCE: system includes mathematical model of drilling process in form of combined influence of conditions at pit-face and of drilling column operation. Model of drilling process is constantly renewed by results of well measurements performed during drilling operation. On basis of renewed drilling process model a set of optimal drilling parameters is determined and sent to system for controlling surface equipment. Also, system allows surface equipment control system to automatically adjust current control sets for surface equipment on basis of renewed optimal drilling parameters. Different control scenarios are generated and executed for transferring data to surface equipment control system on basis of current drilling mode.

EFFECT: optimized operation.

2 cl, 7 dwg

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