Abstract: A testing apparatus for use in an oil well includes an improved power mandrel and power mandrel restraining portion. The power mandrel is disposed in a cylindrical housing having an open bore therethrough and a power port and a circulating port through the walls thereof. The power mandrel includes an annular piston for moving the power mandrel in the first direction in response to fluid pressure exterior of the cylindrical housing communicated to the annular piston through the power port. A plurality of shear pins are disposed in a carrying structure arranged for forced transmitting engagement with a radially extending surface of the power mandrel upon movement of the power mandrel in said first direction. The carrying structure includes inner and outer concentric sleeves through which the shear pins are disposed, with the inner sleeve being arranged for engagement with said radially extending surface of the power mandrel.

Abstract: An elongated body member, a portion of which forms a chamber for retaining samples of the liquid and steam contents of a geothermal well. A fluid tight seal is formed between an O-ring and a parallel sealing face of a slidable shaft member. The pressure sealing force is adjustably controlled by a spring assembly. The spring assembly is adjusted so that the sealing force must be overcome before a sample is taken. When the sealing force exerted upon the seal is overcome, the sample chamber is placed in fluid communication with the geothermal borehole by a series of passages which include grooves or slots contained in the slidable shaft member. After sampling is complete the seal is reformed allowing the sampler to be retrieved to a surface location.

Abstract: An apparatus and method for the selective placement of ball sealers for fluid treatment of a well, said ball sealers having a density less than the density of said fluid comprising a tubular member, means on said tubular member for positioning said apparatus in said well casing and means on said tubular member for deploying and blocking said well casing to prevent upward movement of said ball sealers past said apparatus.

Abstract: The invention relates to the balancing of the pressures in drilled strata, the pressures being lower than that of the liquid columns contained in the entire well.The hydrostatic level of fluid, e.g. a liquid, in the bottom of the well is selected to obtain the balance and the fluid is caused to flow, to additionally serve as a drilling fluid, by separating the fluid into two columns, communicating at either end, between the tubing of the well and a set of rods therein and within the set of rods, and injecting a fluid of lower density into the upper part of one of the columns.

Abstract: A tubular, flexible rubber-like junk boot is positioned on the lower end of a drill string, blade-type stabilizer to catch small but dense particles of debris which are not removed from the hole by the drilling fluid. The boot has means on its lower end for clamping the boot in place.

Abstract: A method and apparatus is disclosed for permanently sealing the lower end of a drill casing to a liquid impermeable layer such as bedrock to prevent contaminating fluid seepage between the casing and the liquid impermeable layer from strata disposed above the impermeable layer. Selected quantities of aggregate, resin monomer and catalyst are introduced into the lower end of the well casing and are caused to mix and polymerize whereafter the resinous mixture is ejected through one or more openings in the casing wall adjacent the bedrock layer to form a plug seal which is chemically and mechanically secured to the well casing and the bedrock layer.

Abstract: A novel oil well pump for reaching greater depths in wells than prior art structures having reduced down casing sizes wherein the pump comprises a plurality of individual hollow cylindrical chambers each operable in a given part of the pipe casing in conjunction with a pump plunger.

Abstract: A method and apparatus are disclosed for mixing two previously separated fluids at a downhole location adjacent a predetermined formation interval.

Abstract: A closure valve for use in oil well testing is presented which provides a full opening flow passage therethrough, and which includes a reverse circulation valve. The closure valve is operated by a power mandrel which is responsive to well annulus pressure, and which is frangibly held in the open position until a predetermined pressure is applied to the fluid in the well annulus. The power mandrel is then frangibly released and moves the closure valve to the closed position. The power mandrel is then disconnected from the closure valve operating mechanism and continues to move to activate a circulation valve opening mechanism. The closure valve includes two normally open ball valves which are spaced apart to trap a sample of formation fluid therebetween when the ball valves are closed.

Abstract: A method and apparatus for testing offshore wells where variations in well annulus pressure are utilized to control the valving operation of a testing tool and entrap a formation sample.A confined body of pressurized fluid positoned in a testing string is utilized to predetermine the annulus pressure changes which will effect said valving and sample entrapping operations.