| Patent Number |
Title Of Patent |
Date Issued |
| 5275040 |
Method of and apparatus for detecting an influx into a well while drilling |
January 4, 1994 |
| Gas influx into a wellbore, which is commonly referred to as a "kick", is detected during active drilling of the borehole. In a preferred embodiment of the invention a determination of mud pump noise round trip transit time T by evaluating a function T=(n-.PHI./2.pi.)f where .PHI. is the |
| 5267398 |
Method for manufacturing a diamond thrust bearing |
December 7, 1993 |
| A diamond thrust bearing and method for manufacturing the diamond thrust bearing wherein diamond bearing pads are interference fitted at ambient temperature into a plurality of equidistantly spaced bearing pad recesses located in a circle in a receiving surface of a bearing pad retainer. |
| 5253939 |
High performance bearing pad for thrust bearing |
October 19, 1993 |
| Cylindrical bearing pads are insertable into bearing pad recesses formed in a receiving surface of a bearing pad retainer in a load-carrying structure. The bearing pads have an insertion end which is fixed into the bearing pad recess by brazing or by interference fitting and a bearing en |
| 5181576 |
Downhole adjustable stabilizer |
January 26, 1993 |
| In accordance with illustrative embodiments of this invention, a downhole adjustable stabilizer includes a sleeve having outwardly extending blades and mounted for limited rotation on a mandrel, vertically aligned sets of radially movable buttons mounted in bores in the blades, and longi |
| 5154078 |
Kick detection during drilling |
October 13, 1992 |
| Gas influx into a wellbore, called A "kick", is detected by two different, yet complementary methods during active drilling of the borehole. The first method is based upon the existence of standing wave patterns generated by pressure oscillations of the drilling rig mud pumps. Such s |
| 5146433 |
Mud pump noise cancellation system and method |
September 8, 1992 |
| Methods for recovering a LWD or MWD data signal in the presence of mud pump noise are provided and generally comprise calibrating the drilling mud pressure as a function of the mud pump piston position, and then tracking the piston position during transmission of the LWD or MWD data sign |
| 5139094 |
Directional drilling methods and apparatus |
August 18, 1992 |
| Methods are provided for controlling the direction of a borehole drilled by a downhole motor, including the steps of positioning downhole adjustable bent housing and near-bit stabilizer in the drill string, adjusting the bent housing from its normally straight condition to its bent condi |
| 5092687 |
Diamond thrust bearing and method for manufacturing same |
March 3, 1992 |
| A diamond thrust bearing and method for manufacturing the diamond thrust bearing wherein diamond bearing pads are interference fitted at ambient temperatures into a plurality of equidistantly spaced bearing pad recesses located in a circle in a receiving surface of a bearing pad retainer |
| 5063776 |
Method and system for measurement of fluid flow in a drilling rig return line |
November 12, 1991 |
| Improved methods and systems are provided for determining a volumetric flow rate of mud in a return line without the aid of a velocity probe. A mud level sensor is located in a return line chimney preferably in close proximity to the bell nipple. The sensor senses the height of the mud |
| 5033557 |
Hydraulic drilling jar |
July 23, 1991 |
| In accordance with an illustrative embodiment of the present invention, a hydraulic drilling jar includes a mandrel and a housing movable between extended and retracted relative positions to deliver jarring blows to a struck object, a piston on the mandrel that slides in a cylinder in th |
| 4981036 |
Method of determining the porosity of an underground formation being drilled |
January 1, 1991 |
| The invention relates to a method of determining the porosity of an undergound formation being drilled by a rotating drill bit mounted at the lower end of a drill string. The torque (TOR) and the weight (WOB) applied on the bit when drilling the underground formation are measured; the |
| 4976143 |
System and method for monitoring drill bit depth |
December 11, 1990 |
| Methods and apparatus for accurately determining drill bit depth are provided. A hook load is sampled at a rate of at least 4 Hz and is compared to a low threshold to establish a slips-in condition. A determination is made retroactively that the drill string stopped moving when the h |
| 4958125 |
Method and apparatus for determining characteristics of the movement of a rotating drill string |
September 18, 1990 |
| The invention is related to a method of determininng the instantaneous rotation speed of a drill string or a drill bit in a borehole or the lateral shocks applied to the string or bit. The centripetal acceleration of the drill string is measured at at least two opposite ends of a drill |
| 4956921 |
Method to improve directional survey accuracy |
September 18, 1990 |
| A method is proposed for better determining the azimuth and inclination of a borehole in which a priori information regarding the magnitude of the earth's gravitational field strength, its magnetic field strength and direction are utilized to constrain the measured components of the eart |
| 4949575 |
Formation volumetric evaluation while drilling |
August 21, 1990 |
| Formation Strength and other measurement while drilling parameters are combined to produce a formation volumetric analysis which may including the traditional volumetric components of clay volume, sand volume, total porosity, and water filled porosity. In shaley formations, the volumetri |
| 4941951 |
Method for improving a drilling process by characterizing the hydraulics of the drilling system |
July 17, 1990 |
| A variety of flow and pressure measurements are obtained to characterize the drilling fluids hydraulics system of the borehole drilling process. Notably, a differential pressure measurement which measures the difference between the pressure internal to and external of the drill bit is ma |
| 4887464 |
Measurement system and method for quantitatively determining the concentrations of a plurality o |
December 19, 1989 |
| A system for the quantitative analysis of one or more evolving gases exiting a borehole includes a Venturi ejector for substantially capturing liberated gases in the bell nipple and return line, a rotating disk extractor for substantially extracting gases entrained and dissolved in d |
| 4876886 |
Method for detecting drilling events from measurement while drilling sensors |
October 31, 1989 |
| Downhole Torque and Rate of Penetration are utilized to develop indications of formations having high porosity or of the development of an undergauge bit. Downhole torque is normalized by dividing it by the product of downhole weight on bit and bit size to produce Dimensionless Torque wh |
| 4852399 |
Method for determining drilling conditions while drilling |
August 1, 1989 |
| Downhole torque and rate of penetration are utilized to develop indications of formations that are porous, argillaceous or tight. This information is useful as an aid in selecting drilling practices and drilling bits. The method separates bit effects from lithology effects when drilling |
| 4847815 |
Sinusoidal pressure pulse generator for measurement while drilling tool |
July 11, 1989 |
| A pressure pulse generator which generates relatively sinusoidal pressure pulses in a fluid flowing in a borehole is disclosed. The pressure pulse generator for a MWD tool broadly comprises: a housing adapted to be connected in a tubing string so that fluid flowing in the string will at |
| 4833914 |
Pore pressure formation evaluation while drilling |
May 30, 1989 |
| Formation strength and other measurement while drilling parameters are combined in a formation volumetric analysis which produces not only the traditional volumetric components of clay volume, mineral volume, total porosity, and water filled porosity, but also, in shaley formations, an |
| 4805449 |
Apparatus and method for measuring differential pressure while drilling |
February 21, 1989 |
| An apparatus and method for measuring differential pressure of mud internal a drill string and mud in a borehole annulus is disclosed. The apparatus typically comprises: a drill collar having a pressure balancing piston in hydraulic contact with the borehole annulus mud; a shaped cylinde |
| 4760735 |
Method and apparatus for investigating drag and torque loss in the drilling process |
August 2, 1988 |
| Drilling conditions are analyzed by, for example, measuring the torque applied at the surface to the drill string and the effective torque acting on the drill bit. The applied torque and effective torque are compared to determine torque loss. Likewise, applied weight on the drill string |
