Method of drilling multiple radial wells using multiple string downhole orientation

A method of drilling radial wells, comprising the following steps:

• a) drilling a borehole with a first drill string;
• b) retrieving the first drill string from the drilled borehole;
• c) attaching a deflection means onto a carrier string and lowering the carrier string into the drilled hole to a preselected depth;
• d) lowering a second drill string having a drill bit on its lower end through the bore of the carrier string to a preselected depth within the carrier string, inner drill string including a means for accommodating a first orientating means within its bore, and a means for aligning the first orientating means to a deflecting angle of the inner drill string;
• e) lowering and securing the first orientating means into the inner drill string and upon activation of a steering means, determining the high side or gyro orientation of the drill bit on the inner drill string;
• f) next, activating a magnetic sensing means of the first orientating means inside the inner string, so that upon activating the a magnetic sensing means, the magnetic sensing means senses artificially induced North and associates it as Magnetic North;
• and
• g) aligning the sensed Magnetic North of the carrier string with the high side or gyro orientation of the inner drill string so that the magnetic sensing means of the carrier string aligns itself with the high side or gyro orientation of the inner string to provide alignment between the inner drill string and the carrier string.

A method of drilling radial wells, comprising the following steps:

• a) drilling a borehole with a first drill string;
• b) retrieving the first drill string from the drilled borehole;
• c) lowering a carrier string having a deflection means on its end, and lowering the string into the drilled hole to a preselected depth;
• d) lowering an inner drill string having a drill bit on its lower end through the bore of the carrier string to a preselected depth within the carrier string;
• e) providing a means on the inner drill string to adapt a steering tool to the inner drill string, and a means to magnetically sense orientation;
• f) lowering and securing the steering tool into the inner drill string and upon activation of the steering tool, determining the high side or gyro orientation of the drill bit on the inner drill string;
• g) activating the magnetic sensing means, for sensing the position of carrier string orientation as Magnetic North;
• h) aligning the magnetic sensing means of the carrier string with the high side or gyro orientation of the inner drill string so that the magnetic sensing means of the carrier string aligns itself with the high side or gyro orientation of the string to provide alignment between the two strings;
• i) drilling a radial well with the inner string off of the deflection means to a preselected depth;
• and
• j) retrieving the inner drill string back into the carrier string and repeating steps e) through i) above.

A method of drilling radial wells, comprising the following steps:

• a) drilling a borehole with a first drill string;
• b) retrieving the first drill string from the drilled borehole;
• c) attaching a deflection means onto a carrier string and lowering it into the drilled hole to a preselected depth;
• d) lowering an inner drill string having a mud motor drilling assembly on its lower end through the bore of the carrier string to a preselected depth within the carrier string;
• e) lowering orienting means into the inner drill string;
• f) activating said orienting means, to orient the mud motor drilling assembly of the inner drill string and the carrier string so that both strings are in the same orientation;
• g) drilling a radial bore with the inner drill string;
• and
• h) retrieving the inner drill string back into the carrier string and reorienting the mud motor drilling assembly of the inner drill string and the carrier string to drill each subsequent radial bore.