A method includes receiving a drill bit design. The design specifies a design parameter for a plurality of cutter elements of a drill bit. The method also includes estimating a temperature value for the cutter elements based on the design parameter and a drilling parameter; estimating a wear value for the cutter elements based on the design parameter and the temperature value; updating a value of the design parameter for at least one of the cutter elements based on the wear value and a time period; and using the updated design parameter value, repeating the steps of estimating the temperature value, estimating the wear value, and updating the design parameter value until the design parameter value for the at least one of the cutter elements reaches a threshold value.

A method includes receiving a drill bit design. The design specifies a design parameter for a plurality of cutter elements of a drill bit. The method also includes estimating a temperature value for the cutter elements based on the design parameter and a drilling parameter; estimating a wear value for the cutter elements based on the design parameter and the temperature value; updating a value of the design parameter for at least one of the cutter elements based on the wear value and a time period; and using the updated design parameter value, repeating the steps of estimating the temperature value, estimating the wear value, and updating the design parameter value until the design parameter value for the at least one of the cutter elements reaches a threshold value.

A hybrid bit with roller cones having inserts is disclosed, includes a bit body, blades and roller cones. All the fixed cutting elements at the inner cone section, nose section and shoulder section of blades herein constitutes two sets of corresponding fixed cutting elements respectively, forming two profile envelopes of fixed cutting elements at least in the interval at the nose section and shoulder section, the two profile envelopes of fixed cutting elements are spaced at high and low intervals at the nose section and shoulder section, forming two stages of cutting by fixed cutting elements; and the cutting position of the cone insert mainly corresponds to the nose section and shoulder section of blades, the outermost cutting profile envelope of cone inserts formed by all or part of cutting elements on cones herein is higher than the outermost cutting profile envelope of fixed cutting elements, forming the third stage of cutting. The invention can effectively develop rate of penetration in hard and plastic formation, maintain and prolong the service life of the hybrid bit, and broaden the formation suitability of the hybrid bit.

A rotating cutter single cone bit includes a bit body and a cone that is rotatably coupled to the bit body. Cutters are arranged on the cone. At least one cutter on the cone is a rotating cutter. The rotating cutter forms a rotational connection with the cone. The geometric center of the front cutting face of the rotating cutter or the front cutting face of the rotating cutter is offset from the rotating axis of the rotating cutter, and the geometric center of the rear cutting face or the rear cutting face of the rotating cutter is on the same side of the offset of the front cutting face. The front cutting face is closer to the rotating axis of the rotating cutter than the rear cutting face. The rotating cutter is rotatable about the rotating axis of the rotating cutter on the cone.

A rotating cutter single cone bit includes a bit body and a cone that is rotatably coupled to the bit body. Cutters are arranged on the cone. At least one cutter on the cone is a rotating cutter. The rotating cutter forms a rotational connection with the cone. The geometric center of the front cutting face of the rotating cutter or the front cutting face of the rotating cutter is offset from the rotating axis of the rotating cutter, and the geometric center of the rear cutting face or the rear cutting face of the rotating cutter is on the same side of the offset of the front cutting face. The front cutting face is closer to the rotating axis of the rotating cutter than the rear cutting face. The rotating cutter is rotatable about the rotating axis of the rotating cutter on the cone.

An earth-boring tool includes a body, a plurality of blades attached to the body and extending at least to a nose region of the earth-boring tool, a first rotatable cutting structure assembly coupled to the body, and a second rotatable cutting structure assembly coupled to the body. The first rotatable cutting structure assembly includes a first leg and a first rotatable cutting structure rotatably coupled to the first leg. A first cutting profile of the first rotatable cutting structure extends at least from a gage region of the earth-boring tool and at least partially through a cone region of the earth-boring tool. The second rotatable cutting structure assembly includes a second leg and a second rotatable cutting structure rotatably coupled to the second leg. A second cutting profile of the second rotatable cutting structure extends only from the gage region of the earth-boring tool and to an innermost boundary of a nose region of the earth-boring tool.

A hybrid earth-boring bit comprising a bit body having a central axis, at least one, preferably three fixed blades, depending downwardly from the bit body, each fixed blade having a leading edge, and at least one rolling cutter, preferably three rolling cutters, mounted for rotation on the bit body. A rolling cutter is located between two fixed blades.

A hybrid earth-boring bit comprising a bit body having a central axis, at least one, preferably three fixed blades, depending downwardly from the bit body, each fixed blade having a leading edge, and at least one rolling cutter, preferably three rolling cutters, mounted for rotation on the bit body. A rolling cutter is located between two fixed blades.

The present disclosure relates to a hybrid bit with roller cone having inserts, comprising a bit body, blades disposed with the bit body, a plurality of fixed cutting elements arranged side by side along the outer edge of blades and roller cones mounted with the said bit body in circumferential and alternate arrangement with the said blades, the said roller cones having multiple rows of cone inserts arranged side by side along the meridian direction of cones, and the said cones having multiple rows of cone inserts arranged side by side along the weft direction of cones, the cutting insert rows of adjacent two cones herein are in alternate arrangement, the cutting insert rows of adjacent two cones are in derangement and the insert placement structure in the plurality of cones is the same.

The present disclosure relates to a hybrid bit with roller cone having inserts, comprising a bit body, blades disposed with the bit body, a plurality of fixed cutting elements arranged side by side along the outer edge of blades and roller cones mounted with the said bit body in circumferential and alternate arrangement with the said blades, the said roller cones having multiple rows of cone inserts arranged side by side along the meridian direction of cones, and the said cones having multiple rows of cone inserts arranged side by side along the weft direction of cones, the cutting insert rows of adjacent two cones herein are in alternate arrangement, the cutting insert rows of adjacent two cones are in derangement and the insert placement structure in the plurality of cones is the same.