| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 175072000 | Prevention of lost circulation or caving | 16 |
| 20090095535 | Methods of Drilling and Consolidating Subterranean Formation Particulates - The present invention relates to improved methods for drilling well bores penetrating producing zones while controlling formation particulates. Some embodiments of the present invention provide methods of consolidating formation particulates surrounding a well bore comprising the steps of providing a drilling composition comprising a drilling fluid and a consolidating material, using the drilling composition to drill at least a portion of the well bore, allowing the consolidating material in the drilling composition to penetrate into the walls of the well bore, and allowing the consolidating material in the drilling composition to consolidate at least a portion of the formation particulates surrounding the well bore | 04-16-2009 |
| 20090294179 | METHOD OF CONTROLLING FLUID LOSS AND MATERIALS USEFUL THEREIN - A method of controlling the loss of a drilling fluid from a well bore into a subterranean formation in which one illustrative embodiment includes: drilling the well bore with an aqueous based drilling fluid that includes an aqueous phase and a shale hydration inhibitor that is a polyether amine compound, and circulating into the well bore a fluid pill including a dialdehyde crosslinking agent. The dialdehyde crosslinking agent reacts with the polyether amine compound and forms a polymeric material. | 12-03-2009 |
| 20090321142 | Well Drilling Method for Prevention of Lost Circulation of Drilling Muds - An improved well drilling method for directional drilling in subterranean formations which comprises incorporating into the drilling fluid an effective amount of fibrillated hydrophobic polypropylene fibers to form a suspension and injecting the suspension into the drill string whereby debris is swept from the borehole and seepage of drilling fluid into the subterranean formation is reduced. | 12-31-2009 |
| 20100230169 | COMPOSITIONS AND METHODS FOR INHIBITING LOST CIRCULATION DURING WELL OPERATIONS - Drilling fluid additive compositions are provided for use with synthetic, oil based, or water based drilling fluids. The combined additive and drilling fluid are effective for reducing lost circulation, seepage loss as well as wellbore strengthening and/or wellbore lining. The method includes injecting the drilling fluid and 0.01 or more pounds per barrel of a loss control additive including ground and sized pumice, barite or dolomite. | 09-16-2010 |
| 20100300760 | ENHANCED SMEAR EFFECT FRACTURE PLUGGING PROCESS FOR DRILLING SYSTEMS - This invention relates to drilling a well, particularly an oil or gas well, where casing or liner will be installed to stabilize the wellbore. The present invention is intended to permit more drilling and longer lengths of casing or liner to be installed at one time. The present invention includes a combination of a smear tool and specially sized granular lost circulation material solids in the drilling mud which work together to close and seal leaking formations and fractures whether pre-existing or induced by drilling. By the natural collection of the inventive solids along with the conventional particles in the drilling mud to form a filter cake at the problem areas along the wall of the wellbore and the smear tool arranged to compress the filter cake into the problem areas, lost circulation is minimized. Maintaining circulation naturally allows for longer drilling cycles and potentially fewer liner joints in the well. As such, larger diameter boreholes are located in the hydrocarbon bearing formation and less time is spent installing casing or liner pipe. | 12-02-2010 |
| 20110168449 | METHODS FOR DRILLING, REAMING AND CONSOLIDATING A SUBTERRANEAN FORMATION - Methods are provided including methods comprising providing a drill-in fluid, a reaming fluid, and a consolidating agent; drilling at least a portion of a subterranean formation with the drill-in fluid whereby a filter cake is formed on a surface of the subterranean formation; reaming at least a portion of the subterranean formation with the reaming fluid whereby at least a portion of the filter cake is removed; and consolidating at least a portion of the subterranean formation with the consolidating agent. Other methods are also provided. | 07-14-2011 |
| 20110253454 | MECHANICALLY MODIFIED FILTER CAKE - A down hole tool including a compression surface, a compression surface axis, and at least one support member configured to attach the compression surface to a well drilling tool assembly, wherein the extendable support member is extendable by an extension force provided to the support member. The down hole tool is rotable relative to an axis of the well drilling tool assembly, and as the well drilling tool assembly rotates, the at least one compression device exerts a lateral force along a sidewall of a wellbore. Also, a method of forming filter cake comprising releasing a drilling fluid and contacting the drilling fluid with a mechanical pressure on the sidewall of the wellbore and the drilling fluid. | 10-20-2011 |
| 20130206479 | DRILLING FLUID AND METHOD FOR DRILLING IN COAL-CONTAINING FORMATIONS - A drilling fluid and method for drilling in a coal containing formation. The method includes: providing a mixed metal-viscosified drilling fluid including at least 0.05% calcium sulfate; circulating the drilling fluid through the well; and drilling into a coal seam. | 08-15-2013 |
| 20140326511 | ENHANCED SMEAR EFFECT FRACTURE PLUGGING PROCESS FOR DRILLING SYSTEMS - This invention relates to drilling a well, particularly an oil or gas well, where casing or liner will be installed to stabilize the wellbore. The present invention is intended to permit more drilling and longer lengths of casing or liner to be installed at one time. The present invention includes a combination of a smear tool and specially sized granular lost circulation material solids in the drilling mud which work together to close and seal leaking formations and fractures whether pre-existing or induced by drilling. By the natural collection of the inventive solids along with the conventional particles in the drilling mud to form a filter cake at the problem areas along the wall of the wellbore and the smear tool arranged to compress the filter cake into the problem areas, lost circulation is minimized Maintaining circulation naturally allows for longer drilling cycles and potentially fewer liner joints in the well. As such, larger diameter boreholes are located in the hydrocarbon bearing formation and less time is spent installing casing or liner pipe. | 11-06-2014 |
| 20140353043 | Method of Conversion of a Drilling Mud to a Gel-Based Lost Circulation Material to Combat Lost Circulation During Continuous Drilling - A method of conversion of a water-based mud to a gel-based LCM quickly to control lost circulation in a lost circulation zone in a wellbore during continuous drilling with a drilling mud, the drilling mud comprises a volcanic ash, water, a de-foamer, a pH buffer, and a polymer. The method comprises the steps of entering the lost circulation zone, determining a lost circulation volumetric flow rate, metering a first amount of a binder into the drilling mud to create a binder containing mud, pumping the binder containing drilling mud into the wellbore, and suspending metering of the first amount of the binder to the drilling mud after a pre-defined regulating period of time effective to permit the binder containing drilling mud to create a gel-based LCM operable to alter the lost circulation zone. | 12-04-2014 |
| 20150008044 | Lost Circulation Drilling Fluids Comprising Elastomeric Rubber Particles and a Method for Decreasing Whole Mud Loss Using Such Composition - The disclosed invention is a unique drilling fluid composition and method for reducing lost mud circulation in wellbores due to seepage loss into fluid permeable subterranean formations. The drilling fluid composition comprises a variety of shapes and sizes of distinctive unadulterated elastomeric rubber particles derived from the tire retreading (recapping) process. These elastomeric rubber particles are incorporated into an aqueous, hydrocarbon, or synthetic drilling fluid in sufficient amounts as to plug holes, fractures, and fissures, form a mud cake, and thus stem the loss of drilling fluids from the lost circulation zone. | 01-08-2015 |
| 20150021098 | BREAKER FLUIDS FOR WELLBORE FLUIDS AND METHODS OF USE - Compositions for controlling fluid loss may include an aqueous fluid, a viscosifier, a water soluble polar organic solvent, a delayed acid source, and a weighting agent. The composition may further comprise at least one selected from bridging solids, cleaning agent, dispersant, interfacial tension reducer, pH buffer, thinner, or surfactant. Such compositions may be used in producing a hydrocarbon from a formation by drilling the formation with a drill-in fluid to form a wellbore, emplacing the composition in the wellbore, and shutting the well for a predetermined time to allow the viscosity of the fluid loss composition to decrease. | 01-22-2015 |
| 20150060146 | RESERVOIR ACTIVATED EMULSION BREAKING FOR LOST CIRCULATION - An oil-in-water emulsion is provided to place a sealant within a subterranean formation by being deployed into the formation to reacte with the formation's included water to break the emulsion, leaving the emulsified components, some of which act as the sealant to form at least a partial seal. The emulsion does not form a seal until emulsified in response to formation water conditions (salinity, pH, calcium ion concentration, temperature), and can be a drilling fluid or a pill during drilling activities. | 03-05-2015 |
| 20150315453 | HIGH TEMPERATURE AND HIGH PRESSURE FLUID LOSS ADDITIVES AND METHODS OF USE THEREOF - Disclosed are high temperature and high pressure fluid loss additives comprising: a) a humic substance, and b) a tetrapolymer prepared from polymerizing: i) acrylamide (AM), ii) 2-acrylamido-2-methylpropane sulfonic acid (AMPS), iii) 1-allyloxy-2-hydroxypropyl sulfonate, and iv) acrylic acid. The use of such high temperature and high pressure fluid loss additives in water-based drilling fluids in oil-field drilling operations is also disclosed. | 11-05-2015 |
| 20160046852 | POLYMER-BASED DRILLING FLUIDS CONTAINING NON-BIODEGRADABLE PARTICULATES AND METHODS FOR USE THEREOF - Polymer-based drilling fluids may be used as an alternative to drilling fluids containing bentonite or other clay materials, although filter cake formation can often be inadequate when using polymer-based drilling fluids. As a result, drilling methods employing polymer-based drilling fluids may sometimes experience unacceptable fluid loss performance within a borehole. Drilling methods with enhanced fluid loss performance may comprise: providing a drilling fluid comprising a carrier fluid, a viscosity-enhancing polymer, and a plurality of non-biodegradable particulates, the non-biodegradable particulates comprising at least silica particulates; drilling a borehole in the presence of the drilling fluid; and forming a filter cake within the borehole, the filter cake comprising the non-biodegradable particulates. | 02-18-2016 |
| 20190145200 | ARC Perm-Squeeze RDF - A Permeable Plug Forming Rapidly Dehydrating Fluid | 05-16-2019 |
